SEC Filing | Tenaris

June 30, 2011

TENARIS S.A.

/s/ Ricardo Soler

Ricardo Soler

Chief Financial Officer

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Form 20-F

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 20-F

(Mark One)

¨	Registration statement pursuant to Section 12(b) or 12(g) of the Securities Exchange Act of 1934

x	Annual report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 for the fiscal year ended December 31, 2010

¨	Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

¨	Shell company report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Commission file number: 001-31518

TENARIS S.A.

(Exact name of Registrant as specified in its charter)

N/A

(Translation of Registrant’s name into English)

Grand Duchy of Luxembourg

(Jurisdiction of incorporation or organization)

29, Avenue de la Porte-Neuve – 3^rd floor

L-2227 Luxembourg

(Address of principal executive offices)

Adelia Soares

29, Avenue de la Porte-Neuve – 3^rd floor

L-2227 Luxembourg

Tel. + (352) 26 47 89 78, Fax. + (352) 26 47 89 79 , e-mail: asoares@tenaris.com

(Name, Telephone, E-Mail and/or Facsimile number and Address of Company Contact Person)

Securities registered or to be registered pursuant to Section 12(b) of the Act:


Title of Each Class		Name of Each Exchange On Which Registered
American Depositary Shares		New York Stock Exchange
Ordinary Shares, par value $1.00 per share		New York Stock Exchange*

*	Ordinary shares of Tenaris S.A. are not listed for trading but only in connection with the registration of American Depositary Shares which are evidenced by American Depositary Receipts.

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

Securities for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

Indicate the number of outstanding shares of each of the issuer’s classes of capital or common stock as of the close of the period covered by the annual report.

1,180,536,830 ordinary shares, par value $1.00 per share

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes x No ¨

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934. Yes ¨ No x

Note—checking the box above will not relieve any registrant required to file reports pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 from their obligations under those Sections.

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Website, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes ¨ No x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, or a non-accelerated filer. See definition of “accelerated filer and large accelerated filer” in Rule 12b-2 of the Exchange Act (Check one):

Large accelerated filer x Accelerated Filer ¨ Non-accelerated filer ¨

Indicate by check mark which basis of accounting the registrant has used to prepare the financial statements included in this filing:


		U.S. GAAP ¨		International Financial Reporting Standards as issued by the International Other ¨
				Accounting Standards Board x

If “Other” has been checked in response to the previous question indicate by check mark which financial statement item the registrant has elected to follow. Item 17 ¨ Item 18 ¨

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ¨ No x

Please send copies of notices and communications from the Securities and Exchange Commission to:

Cristian J. P. Mitrani

Mitrani, Caballero, Rosso Alba,

Francia, Ojam & Ruiz Moreno Abogados

Alicia Moreau de Justo 400, 3rd Floor

(C1107AAH) Buenos Aires, Argentina

(54 11) 4590-8600

Robert S. Risoleo, Esq.

Sullivan & Cromwell LLP

1701 Pennsylvania Avenue NW

Washington, DC 20006

(202) 956-7500

TABLE OF CONTENTS


PART I		4

Item 1.	Identity of Directors, Senior Management and Advisers	4
Item 2.	Offer Statistics and Expected Timetable	4
Item 3.	Key Information	4
Item 4.	Information on the Company	16
Item 4A.	Unresolved Staff Comments.	40
Item 5.	Operating and Financial Review and Prospects	40
Item 6.	Directors, Senior Management and Employees	62
Item 7.	Major Shareholders and Related Party Transactions.	70
Item 8.	Financial Information	74
Item 9.	The Offer and Listing	76
Item 10.	Additional Information	81
Item 11.	Quantitative and Qualitative Disclosure about Market Risk	92
Item 12.	Description of Securities Other Than Equity Securities	96

PART II		98

Item 13.	Defaults, Dividend Arrearages and Delinquencies	98
Item 14.	Material Modifications to the Rights of Security Holders and Use of Proceeds	98
Item 15.	Controls and Procedures	98
Item 16.A.	Audit Committee Financial Expert	99
Item 16.B.	Code of Ethics	99
Item 16.C.	Principal Accountant Fees and Services	99
Item 16.D.	Exemptions from the Listing Standards for Audit Committees	100
Item 16.E.	Purchases of Equity Securities by the Issuer and Affiliated Purchasers	100
Item 16.F.	Change in Registrant’s Certifying Accountant	102
Item 16.G.	Corporate Governance	102

PART III		104

Item 17.	Financial Statements	104
Item 18.	Financial Statements	104
Item 19.	Exhibits	104

CERTAIN DEFINED TERMS

Unless otherwise specified or if the context so requires:

•

References in this annual report to “the Company” refer exclusively to Tenaris S.A., a Luxembourg public limited liability company (société anonyme).

•

References in this annual report to “Tenaris”, “we”, “us” or “our” refer to Tenaris S.A. and its consolidated subsidiaries. See Accounting Policies (“AP”) A and B to our audited consolidated financial statements included in this annual report.

•

References in this annual report to “San Faustin” refer to San Faustin S.A. (formerly known as San Faustin N.V.), a Luxembourg public limited liability company (société anonyme) and the Company’s controlling shareholder.

•

“Shares” refers to ordinary shares, par value $1.00, of the Company.

•

“ADSs” refers to the American Depositary Shares, which are evidenced by American Depositary Receipts, and represent two Shares each.

•

“tons” refers to metric tons; one metric ton is equal to 1,000 kilograms, 2,204.62 pounds, or 1.102 U.S. (short) tons.

•

“billion” refers to one thousand million, or 1,000,000,000.

PRESENTATION OF CERTAIN FINANCIAL AND OTHER INFORMATION

Accounting Principles

We prepare our consolidated financial statements in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board and adopted by the European Union, or IFRS. IFRS differ in certain significant respects from generally accepted accounting principles in the United States, commonly referred to as U.S. GAAP.

We publish consolidated financial statements presented in increments of a thousand U.S. dollars. This annual report includes our audited consolidated financial statements for the years ended December 31, 2010, 2009 and 2008.

Currencies

In this annual report, unless otherwise specified or the context otherwise requires:

•

“dollars”, “U.S. dollars”, “US$” or “$” each refers to the United States dollar;

•

“€”, “EUR” or “euros” each refers to the Euro, the common currency of the European Union;

•

“Argentine pesos” or “ARS” each refers to the Argentine peso;

•

“Brazilian real” or “BRL” each refers to the Brazilian real;

•

“Canadian dollars” or “CAD” each refers to the Canadian dollar;

•

“Chinese yuan” or CNY each refers to the Chinese yuan;

•

“Mexican pesos” or “MXP” each refers to the Mexican peso;

•

“Romanian lei” or “RON” each refers to the Romanian new lei; and

•

“Yen”, “Japanese yen” or “JPY” each refers to the Japanese yen.

The “representative exchange rates”, as published by the International Monetary Fund, or IMF, were the following on December 30, 2010: €1.00=$1.328; JPY81.45=$1.00; CAD1.0009=$1.00; CNY6.6229=$1.00; MXP12.3817=$1.00; and the following on December 29, 2010: BRL1.6858=$1.00. The exchange rate between the U.S. dollar and the Argentine peso (as published by Banco Central de la República Argentina, or the Argentine Central Bank) was ARS3.976=$1.00 on December 31, 2010. The exchange rate between the U.S. dollar and the Romanian lei (as published by the National Bank of Romania) was RON3.2045=$1.00 on December 31, 2010. Those rates may differ from the actual rates used in the preparation of our consolidated financial statements. We do not represent that any of these currencies could have been or could be converted into U.S. dollars or that the U.S. dollars could have been or could be converted into any of these currencies.

Rounding

Certain monetary amounts, percentages and other figures included in this annual report have been subject to rounding adjustments. Accordingly, figures shown as totals in certain tables may not be the arithmetic aggregation of the figures that precede them, and figures expressed as percentages in the text may not total 100% or, as applicable, when aggregated may not be the arithmetic aggregation of the percentages that precede them.

Our Internet Website is Not Part of this Annual Report

We maintain an Internet website at www.tenaris.com. Information contained in or otherwise accessible through our Internet website is not a part of this annual report. All references in this annual report to this Internet site are inactive textual references to these URLs, or “uniform resource locators” and are for informational reference only. We assume no responsibility for the information contained on our Internet website.

CAUTIONARY STATEMENT CONCERNING FORWARD-LOOKING STATEMENTS

This annual report and any other oral or written statements made by us to the public may contain “forward-looking statements” within the meaning of and subject to the “safe harbor” provisions of the Private Securities Litigation Reform Act of 1995. This annual report contains forward-looking statements, including with respect to certain of our plans and current goals and expectations relating to Tenaris’s future financial condition and performance.

Sections of this annual report that by their nature contain forward-looking statements include, but are not limited to, Item 3. “Key Information”, Item 4. “Information on the Company”, Item 5. “Operating and Financial Review and Prospects”, Item 8. “Financial Information” and Item 11. “Quantitative and Qualitative Disclosure About Market Risk”.

We use words such as “aim”, “will likely result”, “will continue”, “contemplate”, “seek to”, “future”, “objective”, “goal”, “should”, “will pursue”, “anticipate”, “estimate”, “expect”, “project”, “intend”, “plan”, “believe” and words and terms of similar substance to identify forward-looking statements, but they are not the only way we identify such statements. All forward-looking statements are management’s present expectations of future events and are subject to a number of factors and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements. These factors include the risks related to our business discussed under Item 3. D. “Key Information – Risk Factors” among them, the following:

•

our ability to implement our business strategy or to grow through acquisitions, joint ventures and other investments;

•

the competitive environment in our business and our industry

•

our ability to price our products and services in accordance with our strategy;

•

trends in the levels of investment in oil and gas exploration and drilling worldwide;

•

general macroeconomic and political conditions and developments in the countries in which we operate or distribute pipes; and

•

our ability to absorb cost increases and to secure supplies of essential raw materials and energy.

By their nature, certain disclosures relating to these and other risks are only estimates and could be materially different from what actually occurs in the future. As a result, actual future gains or losses that may affect our financial condition and results of operations could differ materially from those that have been estimated. You should not place undue reliance on the forward-looking statements, which speak only as of the date of this annual report. Except as required by law, we are not under any obligation, and expressly disclaim any obligation, to update or alter any forward-looking statements, whether as a result of new information, future events or otherwise.

PART I

Item 1.

Identity of Directors, Senior Management and Advisers

Not applicable.

Item 2.

Offer Statistics and Expected Timetable

Not applicable.

Item 3.

Key Information

A.	Selected Financial Data

The selected consolidated financial data set forth below have been derived from our audited consolidated financial statements for each of the years and at the dates indicated herein. Our consolidated financial statements were prepared in accordance with IFRS, and were audited by Price Waterhouse & Co. S.R.L., of Argentina, a registered public accounting firm and a member firm of PWC. IFRS differ in certain significant respects from U.S. GAAP.

For a discussion of the currencies used in this annual report, exchange rates and accounting principles affecting the financial information contained in this annual report, please see “Presentation of Certain Financial and other Information—Accounting Principles” and “Presentation of Certain Financial and other Information—Currencies”.


Thousands of U.S. dollars (except number of shares and per share amounts)	For the year ended December 31,
	2010			2009			2008			2007			2006
Selected consolidated income statement data⁽¹⁾

Continuing operations
Net sales		7,711,598			8,149,320			11,987,760			9,874,312			7,559,485
Cost of sales		(4,700,810	)		(4,864,922	)		(6,698,285	)		(5,408,984	)		(3,783,978	)

Gross profit		3,010,788			3,284,398			5,289,475			4,465,328			3,775,507
Selling, general and administrative expenses		(1,515,870	)		(1,473,791	)		(1,787,952	)		(1,551,836	)		(1,041,396	)
Other operating income (expenses), net		78,629			3,000			(375,873	)		3,480			7,828

Operating income		1,573,547			1,813,607			3,125,650			2,916,972			2,741,939
Interest income		32,855			30,831			48,711			92,733			60,767
Interest expense		(64,103	)		(118,301	)		(179,885	)		(270,705	)		(86,936	)
Other financial results		(21,305	)		(64,230	)		(99,850	)		(22,358	)		27,264

Income before equity in earnings of associated companies and income tax		1,520,994			1,661,907			2,894,626			2,716,642			2,743,034
Equity in earnings of associated companies		70,057			87,041			89,423			113,062			94,697

Income before income tax		1,591,051			1,748,948			2,984,049			2,829,704			2,837,731
Income tax		(450,004	)		(513,211	)		(1,015,334	)		(805,773	)		(861,999	)

Income for continuing operations		1,141,047			1,235,737			1,968,715			2,023,931			1,975,732

Discontinued operations
Result for discontinued operations		—			(28,138	)		306,905			52,128			83,672

Income for the year ⁽²⁾		1,141,047			1,207,599			2,275,620			2,076,059			2,059,404
Income attributable to ⁽²⁾:
Equity holders of the Company		1,127,367			1,161,555			2,124,802			1,923,748			1,945,314
Non-controlling interests		13,680			46,044			150,818			152,311			114,090

Income for the year ⁽²⁾		1,141,047			1,207,599			2,275,620			2,076,059			2,059,404

Depreciation and amortization		(506,902	)		(504,864	)		(532,934	)		(514,820	)		(255,004	)
Weighted average number of shares outstanding		1,180,536,830			1,180,536,830			1,180,536,830			1,180,536,830			1,180,536,830
Basic and diluted earnings per share for continuing operations		0.95			1.00			1.49			1.58			1.59
Basic and diluted earnings per share		0.95			0.98			1.80			1.63			1.65
Dividends per share⁽³⁾		0.34			0.34			0.43			0.38			0.30

(1)

Certain comparative amounts have been re-presented to conform to changes in presentation in 2009, 2007 and 2006, mainly due to the nationalization of certain Venezuelan subsidiaries in 2009 and the sale of a majority ownership in Dalmine Energie. For more information on the nationalization of these Venezuelan subsidiaries, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

(2)

International Accounting Standard No. 1 (“IAS 1”) (revised), requires that income for the year as shown on the income statement not exclude non-controlling interests. Earnings per share, however, continue to be calculated on the basis of income attributable solely to the equity holders of the Company.

(3)	Dividends per share correspond to the dividends proposed or paid in respect of the year.


*Thousands of U.S. dollars (except number of shares)*	At December 31,
	2010		2009		2008		2007		2006
Selected consolidated financial position data

Current assets		5,955,536		5,621,841		7,252,417		⁽¹⁾6,514,043		6,028,832
Property, plant and equipment, net		3,780,580		3,254,587		2,982,871		3,269,007		2,939,241
Other non-current assets		4,628,215		4,606,880		4,865,424		5,461,537		3,627,169

Total assets		14,364,331		13,483,308		15,100,712		15,244,587		12,595,242

Current liabilities		2,378,546		1,970,470		3,790,017		⁽¹⁾3,328,066		2,765,504
Non-current borrowings		220,570		655,181		1,241,048		2,869,466		2,857,046
Deferred tax liabilities		934,226		860,787		1,053,838		1,233,836		991,945
Other non-current liabilities		280,409		276,034		313,922		283,369		279,117

Total liabilities		3,813,751		3,762,472		6,398,825		7,714,737		6,893,612
Capital and reserves attributable to the Company’s equity holders		9,902,359		9,092,164		8,176,571		7,006,277		5,338,619
Non-controlling interests		648,221		628,672		525,316		523,573		363,011

Equity		10,550,580		9,720,836		8,701,887		7,529,850		5,701,630

Total liabilities and equity		14,364,331		13,483,308		15,100,712		15,244,587		12,595,242

Share capital		1,180,537		1,180,537		1,180,537		1,180,537		1,180,537
Number of shares outstanding		1,180,536,830		1,180,536,830		1,180,536,830		1,180,536,830		1,180,536,830

(1)	In 2007, “current assets” includes current and non current assets held for sale ($651.2 million), relating to the divestment of Hydril’s pressure control business and “current liabilities” includes liabilities associated with such assets ($267.0 million).

B.	Capitalization and Indebtedness

Not applicable.

C.	Reasons for the Offer and Use of Proceeds

Not applicable.

D.	Risk Factors

You should carefully consider the risks and uncertainties described below, together with all other information contained in this annual report, before making any investment decision. Any of these risks and uncertainties could have a material adverse effect on our business, revenues, financial condition and results of operations, which could in turn affect the price of Shares and ADSs.

Risks Relating to our Industry

Sales and profitability may fall as a result of downturns in the international price of oil and gas and other circumstances affecting the oil and gas industry.

We are a global steel pipe manufacturer with a strong focus on manufacturing products and related services for the oil and gas industry. The oil and gas industry is a major consumer of steel pipe products worldwide, particularly for products manufactured under high quality standards and demanding specifications. Demand for steel pipe products from the oil and gas industry has historically been volatile and depends primarily upon the number of oil and natural gas wells being drilled, completed and reworked, and the depth and drilling conditions of these wells. The level of exploration, development and production activities of, and the corresponding capital spending by, oil and gas companies, including national oil companies, depends primarily on current and expected future prices of oil and natural gas and is sensitive to the industry’s view of future economic growth and the resulting impact on demand for oil and

natural gas. Several factors, such as the supply and demand for oil and gas, and political and global economic conditions, affect these prices. When the price of oil and gas falls, oil and gas companies generally reduce spending on production and exploration activities and, accordingly, make fewer purchases of steel pipe products. Other circumstances – such as geopolitical events and hostilities in the Middle East and elsewhere – may also affect drilling activity and, as a result, cause steel pipe consumption to decline, and thus have a material impact on our revenues, profitability and financial condition. For example, our sales in Lybia and Yemen have been adversely affected by recent political uprisings in the region.

Our industry is cyclical and fluctuations in industry inventory levels may adversely affect our sales and revenues.

Inventory levels of steel pipe in the oil and gas industry can vary significantly from period to period and from region to region. These fluctuations can affect demand for our products. During periods of high demand, industry participants increase the production of pipe products and customers accumulate inventory. Conversely, during periods of low investment in drilling and other activities, customers draw from existing inventory. Particularly, when oil and gas prices fall, oil and gas companies are generally expected to hold or reduce purchases of additional steel pipe products. Demand for oil country tubular goods, or OCTG, has suffered a strong adjustment in 2009, as a result of the decline in oil and gas drilling activity and efforts to reduce inventories, particularly in North America. Similarly, sales in the Middle East and Africa in 2008 and 2009 were adversely affected by inventory adjustments following inventory build-ups in 2006 and the first half of 2007.

Competition in the global market for steel pipe products may cause us to lose market share and hurt our sales and profitability.

The global market for steel pipe products is highly competitive, with the primary competitive factors being price, quality, service and technology. We compete in most markets outside North America primarily against a limited number of manufacturers of premium-quality steel pipe products. In the United States and Canada, we compete against a wide range of local and foreign producers. In recent years, substantial investments have been made, especially in China, to increase production capacity of seamless steel pipe products. New production capacity continues to be installed and there is significant excess production capacity, particularly for “commodity” or standard product grades. Capacity for the production of more specialized product grades is also increasing. In addition, there is an increased risk of unfairly-traded steel pipe imports in markets in which Tenaris produces and sells its products. The competitive environment, therefore, is expected to be more intense in the next five years than it has been in the previous five years. We may not continue to compete effectively against existing or potential producers and preserve our current shares of geographic or product markets, and increased competition may have a material impact on the pricing of our products and services, which could in turn adversely affect our revenues, profitability and financial condition.

Our sales of steel pipe products for pipeline projects are volatile and depend mainly on the implementation of major regional projects and on our ability to secure contracts to supply these projects.

Our sales of pipes for pipeline projects depend to a large extent on the number of active pipeline projects under contract and their rate of progress, particularly in the South American regional market where we have our manufacturing facilities for these products. Future sales of these products depend to a large extent on our ability to secure contracts to supply major pipeline projects and their subsequent implementation. The implementation of such projects varies significantly from year to year. For example, our sales of pipes for pipelines projects in 2007 and 2008 increased compared to 2006, as pipeline projects began to be implemented when average selling prices of pipes rose. In 2009, net sales of these products fell again, as many of the projects were concluded and the order backlog declined throughout the year, and were adversely affected in 2010 due to a strong slowdown of major regional projects. Accordingly, our pipeline project revenues and profitability may fluctuate significantly in future years depending on our success in securing large supply contracts and on other factors, including the cancellation or postponement of specific projects due to changes in governmental policies, the impact of the credit crisis on our customers’ ability to perform their payment obligations with us and any adverse economic, political or social developments in our major markets.

Increases in the cost of raw materials, energy and other costs, limitations or disruptions to the supply of raw materials and energy; and price mismatches between raw materials and our products may hurt our profitability.

The manufacture of seamless steel pipe products requires substantial amounts of steelmaking raw materials and energy; welded steel pipe products, in turn, are processed from steel coils and plates. The availability and pricing of a significant portion of the raw materials and energy we require are subject to supply and demand conditions, which can be volatile, and to government regulation, which can affect continuity of supply and prices. During the second half of 2008, the cost of raw materials used in our business fell steeply as the recessionary environment had an almost immediate impact on global steelmaking activity. The cost of raw materials stabilized during the first part of 2009 and started an upward trend in the second part of 2009, which continued in 2010. In addition, disruptions, restrictions or limited availability of energy resources in markets where we have significant operations could lead to higher costs of production and eventually to production cutbacks at our facilities in such markets. For example, shortages of energy and natural gas in Argentina and the resulting supply restrictions imposed by the government could affect operations at our facilities in Argentina. See Item 3.D. “Key Information—Risks Factors—Risks Relating to our Business—Adverse economic or political conditions in the countries where we operate or sell our products and services may decrease our sales or disrupt our manufacturing operations, thereby adversely affecting our revenues, profitability and financial condition”. At any given time, we may be unable to obtain an adequate supply of critical raw materials with price and other terms acceptable to us. The availability and prices of raw materials may also be negatively affected by new laws and regulations, allocation by suppliers, interruptions in production, accidents or natural disasters, changes in exchange rates, worldwide price fluctuations, and the availability and cost of transportation. Moreover, we are dependent on a few suppliers for a significant portion of our requirements for steel coils at our welded pipe operations in North America and the loss of any of these suppliers could result in increased production costs, production cutbacks and reduced competitiveness at these operations.

We may not be able to recover increased costs of raw materials and energy through increased prices on our products, and limited availability could force us to curtail production, which could adversely affect our sales and profitability. In addition, like other manufacturers of steel-related products, we have fixed and semi-fixed costs (e.g., labor and other operating and maintenance costs) that cannot adjust rapidly to fluctuations in product demand. If demand for our products falls significantly, these costs may adversely affect our profitability.

Risks Relating to our Business

Adverse economic or political conditions in the countries where we operate or sell our products and services may decrease our sales or disrupt our manufacturing operations, thereby adversely affecting our revenues, profitability and financial condition.

We are exposed to economic and political conditions in the countries where we operate or sell our products and services. The economies of these countries are in different stages of social and economic development. Like other companies with worldwide

operations, we are exposed to risks from fluctuations in foreign currency exchange rates, interest rates and inflation. We are also affected by governmental policies regarding spending and investment, exchange controls, regulatory and taxation changes, and other adverse political, economic or social developments of the countries in which we operate.

Significant portions of our operations are located in countries with a history of political volatility or instability. As a consequence, our business and operations have been, and could in the future be, affected from time to time to varying degrees by political developments, events, laws and regulations (such as nationalization, expropriation or forced divestiture of assets; restrictions on production, imports and exports; interruptions in the supply of essential energy inputs; exchange and/or transfer restrictions; inability to repatriate income or capital; inflation; devaluation; war or other international conflicts; civil unrest and local security concerns, including high incidences of crime and violence involving drug trafficking organizations, that threaten the safe operation of our facilities and operations; direct and indirect price controls; tax increases; changes in the interpretation or application of tax laws and other retroactive tax claims or challenges; changes in laws, norms and regulations; cancellation of contract rights; and delays or denials of governmental approvals). Both the likelihood of such occurrences and their overall impact upon us vary greatly from country to country and are not predictable. Realization of these risks could have an adverse impact on the results of operations and financial condition of our subsidiaries located in the affected country.

For example, we have significant manufacturing operations and assets in Argentina and we derive a significant portion of our revenues from that country. Our business may be materially and adversely affected by economic, political, fiscal and regulatory developments in Argentina, including the following:

•

Our business and operations in Argentina may be adversely affected by inflation or by the measures that may be adopted by the government to address inflation. In particular, increases in services and labor costs could negatively affect our results of operations. In addition, an increased level of labor demands could trigger higher levels of labor conflicts, and eventually result in strikes or work stoppages. Any such disruption of operations could have an adverse effect on our operations and financial results.

•

The Argentine government has increased taxes on our operations in Argentina through several methods. If the Argentine government continues to increase the tax burden on our operations, our results of operation and financial condition could be adversely affected.

•

Restrictions on the supply of energy to our operations in Argentina could curtail our production and adversely affect our results of operations. There has been a lack of investment in natural gas and electricity supply and transport capacity in Argentina in recent years. Over the course of the last several years, demand for natural gas and electricity has increased substantially, driven by a recovery in economic conditions and low prices in comparison with alternative fuel sources. This in turn has resulted in shortages of natural gas and electricity to residential and industrial users during periods of high demand. For example, in recent years, our operations in Argentina experienced constraints in their electricity and natural gas supply requirements on many occasions. If demand for natural gas and electricity increases and a matching increase in natural gas and electricity supply and transport capacity fails to materialize on a timely basis, our production in Argentina (or that of our main customers and suppliers), could be curtailed, and our sales and revenues could decline. Although we are taking measures to limit the effect of supply restrictions on our operations in Argentina, such efforts might not be sufficient to avoid an adverse impact on our production in Argentina and we might not be able to similarly limit the effect of future supply restrictions. In addition, it is possible that we could also face increased costs when using alternative sources of energy.

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The Argentine Central Bank has imposed restrictions on the transfer of funds outside of Argentina and other exchange controls in the past and may do so in the future, which could prevent us from paying dividends or other amounts from cash generated by our Argentine operations. We are currently required to repatriate U.S. dollars collected in connection with exports from Argentina (including U.S. dollars obtained through advance payment and pre-financing facilities) into Argentina and convert them into Argentine pesos at the market-based floating exchange rate applicable on the date of repatriation. This requirement, and any similar requirement that may be imposed in the future, exposes us to the risk of losses arising from fluctuations in the exchange rate of the Argentine peso. For additional information on current Argentine exchange controls and restrictions see Item 10.D. “Additional Information – Exchange Controls – Argentina”.

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The Argentine government has imposed export restrictions and/or export taxes on certain activities, mainly in connection with commodities, gas and oil. Even though the Argentine government has not yet imposed any export restrictions concerning our activities, if any such restrictions were to be imposed, our business and operations in Argentina could be adversely affected.

We currently have the following exposure to political and economic developments in Venezuela:

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We have a significant share of the market for OCTG products. We enjoy ongoing business relationships with Petróleos de Venezuela, or PDVSA, and the joint venture operators in the oil and gas sector. In 2010, our sales in Venezuela were negatively affected as PDVSA delayed payments to suppliers. While we maintain reserves for potential credit losses and analyze trade account receivables on a regular basis, our revenues, profitability and financial condition could be adversely affected by Venezuela’s political and economic environment.

•

In addition, we have a 70% interest in the share capital of Tavsa, Tubos de Acero de Venezuela S.A, or Tavsa, which owns a seamless steel pipe plant located within Sidor C.A.’s iron and steel manufacturing complex. The plant uses steel bars supplied by Sidor as its principal raw material, and is also dependent on Sidor for the supply of energy and other inputs. Additionally, in July 2004, together with Sidor, we acquired an industrial facility, Matesi Materiales Siderúrgicos S.A., or Matesi, in Ciudad Guayana, Venezuela, to produce hot briquetted iron, or HBI. We own 50.2% of Matesi and Sidor owns the remaining 49.8%. We also own a minority interest in Complejo Siderúrgico de Guayana, or Comsigua, another Venezuelan HBI producer. In 2009, Venezuela’s President Hugo Chávez announced the nationalization of, among other companies, Tavsa, Matesi and Comsigua. In August, 2009, Venezuela, acting through the transition committee appointed by the Minister of Basic Industries and Mines of Venezuela, unilaterally assumed exclusive operational control over Matesi, and in November, 2009, Venezuela, acting through PDVSA Industrial S.A. (a subsidiary of Petroleos de Venezuela S.A.), formally assumed exclusive operational control over the assets of Tavsa. In 2010, Venezuela’s National Assembly declared Matesi’s assets to be of public and social interest and ordered the Executive Branch to take the necessary measures for the expropriation of such assets. In June 2011 President Chavez issued Decree 8280/2011, which ordered the expropriation of Matesi’s assets as may be required for the implementation of a state-owned project for the production, sale and distribution of briquettes, and further instructed to commence negotiations and take any actions required for the acquisition of such assets. Our investments in these Venezuelan companies are protected under applicable bilateral investment treaties, including the bilateral investment treaty between Venezuela and the Belgian-Luxembourgish Union, and we continue to reserve all of our rights under contracts, investment treaties and Venezuelan and international law, and to consent to the jurisdiction of the ICSID in connection with the nationalization process. On June 21, 2011 Tenaris announced that it will take legal actions against Venezuela to seek prompt, fair and adequate compensation for its entire interest (including assets and liabilities) in Matesi. For more information on the nationalization of these Venezuelan

companies, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Similarly, our Mexican operations could be affected by the increasing criminal violence, primarily due to the activities of drug cartels and related organized crime that Mexico has experienced and may continue to experience. Although the Mexican government has implemented various security measures and has strengthened its military and police forces, drug-related crime continues to exist in Mexico. Our business may be materially and adversely affected by these activities, their possible escalation and the violence associated with them.

If we do not successfully implement our business strategy, our ability to grow, our competitive position and our sales and profitability may suffer.

We plan to continue implementing our business strategy of developing higher value products designed to serve and meet the needs of customers operating in demanding environments, developing and offering additional value-added services, which enable us to integrate our production activities with the customer’s supply chain, and continuing to pursue strategic investment opportunities. Any of these components of our overall business strategy could cost more than anticipated or may not be successfully implemented or could be delayed or abandoned. For example, we may fail to develop products that differentiate us from our competitors or fail to find suitable investment opportunities, including acquisition targets that enable us to continue to grow and improve our competitive position. Even if we successfully implement our business strategy, it may not yield the expected results.

We could be subject to regulatory risks associated with our international operations.

The shipment of goods and services across international borders subjects us to extensive trade laws and regulations. Our import and export activities are governed by customs laws and regulations in each of the countries where we operate. Moreover, the European Union, the United States and other countries, control the import and export of certain goods and services and impose related import and export recordkeeping and reporting obligations. Those governments also may impose economic sanctions against certain countries, persons and other entities that may restrict or prohibit transactions involving such countries, persons and entities. Similarly, we are subject to the U.S. anti-boycott laws. These laws and regulations are complex and frequently changing, and they may be enacted, amended, enforced or interpreted in a manner that can materially impact our operations. Any failure to comply with these applicable legal and regulatory obligations also could result in criminal and civil penalties and sanctions.

If we are unable to agree with our joint venture partner in Japan regarding the strategic direction of our joint operations, our operations in Japan may be adversely impacted.

In 2000, we entered into a joint venture agreement with a term of 15 years with NKK Corporation, or NKK, to form NKKTubes. In September 2002, NKK and Kawasaki Steel, one of our main competitors, completed a business combination through which they became subsidiaries of JFE Holdings Inc., or JFE. JFE’s continued operation of the former Kawasaki Steel steel pipe business in competition with NKKTubes, or JFE’s potential lack of interest in the continued development of NKKTubes, could place NKKTubes at a disadvantage and adversely impact our operations in Japan.

Future acquisitions and strategic partnerships may not perform in accordance with expectations or may disrupt our operations and hurt our profits.

One element of our business strategy is to identify and pursue growth-enhancing strategic opportunities. As part of that strategy, we acquired interests in various companies during the last years. For example, in April 2009, we acquired a 77.45% holding in Seamless Pipe Indonesia Jaya, or SPIJ, an Indonesian OCTG processing business with heat treatment and premium connection threading facilities and in May 2007, we acquired Hydril Corporation, or Hydril, a leading North American producer of premium connections and pressure control products for the oil and gas industry. We will continue to consider other strategic acquisitions and partnerships from time to time. We must necessarily base any assessment of potential acquisitions and partnerships on assumptions with respect to operations, profitability and other matters that may subsequently prove to be incorrect. Our SPIJ, Hydril and other past or future acquisitions, significant investments and alliances may not perform in accordance with our expectations and could adversely affect our operations and profitability. In addition, new demands on our existing organization and personnel resulting from the integration of new acquisitions could disrupt our operations and adversely affect our operations and profitability. Moreover, we may also acquire, as part of future acquisitions, assets unrelated to our business, and we may not be able to integrate them or sell them under favorable terms and conditions.

We may be required to record a significant charge to earnings if we must reassess our goodwill or other intangible assets as a result of changes in assumptions underlying the carrying value of certain assets, particularly as a consequence of deteriorating market conditions.

Assets that are subject to amortization are reviewed for impairment whenever events or changes in circumstances indicate that the carrying amount may not be recoverable. Intangible assets with indefinite useful life, including goodwill, are subject to at least an annual impairment test. At December 31, 2010, we had $1,804.7 million in goodwill, which correspond mainly to the acquisition of Maverick ($771.3 million) and Hydril ($919.9 million). No impairment charge was recorded in 2010 nor in 2009. In 2008, as a consequence of changes in market conditions, we recorded an impairment charge for $502.9 million (of which $394.3 million correspond to intangible assets originated from the acquisition of Maverick in 2006). In 2010, we reversed $67.3 million of this impairment, which correspond to Prudential’s customer relationships. If our management were to determine in the future that the goodwill from the acquisitions of Maverick and Hydril was impaired, particularly as a consequence of deteriorating market conditions, we would be required to recognize a non-cash charge to reduce the value of this goodwill, which would adversely affect our results of operations.

Our results of operations and financial condition could be adversely affected by movements in exchange rates.

As a global company we manufacture and sell products in a number of countries throughout the world and a portion of our business is carried out in currencies other than the U.S. dollar, which is the Company’s functional and presentation currency. As a result, we are exposed to foreign exchange rate risk. Changes in currency values could adversely affect our financial condition and results of operations. For information on our foreign exchange rate risk, please see Item 11 “Quantitative and Qualitative Disclosure about Market Risk – Foreign Exchange Rate Risk”.

Related-party transactions with companies controlled by San Faustin may not be on terms as favorable as could be obtained from unrelated and unaffiliated third parties.

A portion of our sales and purchases of goods and services are made to and from other companies controlled by San Faustin. These sales and purchases are primarily made in the ordinary course of business and we believe they are carried out on terms no less favorable than those we could obtain from unaffiliated third parties. We will continue to engage in related-party transactions in the future, and these transactions may not be on terms as favorable as could be obtained from unaffiliated third parties. For information concerning our principal transactions with related parties, see Item 7.B. “Major Shareholders and Related Party Transactions – Related Party Transactions”.

If we do not comply with laws and regulations designed to combat governmental corruption in countries in which we sell our products, we could become subject to fines, penalties or other sanctions and our sales and profitability could suffer.

We conduct business in certain countries known to experience governmental corruption. Although we are committed to conducting business in a legal and ethical manner in compliance with local and international statutory requirements and standards applicable to our business, there is a risk that our employees or representatives may take actions that violate applicable laws and regulations that generally prohibit the making of improper payments to foreign government officials for the purpose of obtaining or keeping business, including laws relating to the 1997 OECD Convention on Combating Bribery of Foreign Public Officials in International Business Transactions such as the U.S. Foreign Corrupt Practices Act, or FCPA. Particularly in respect of FCPA, we entered into settlements with the U.S. Department of Justice, or DOJ, and the U.S. Securities and Exchange Commission, or SEC, on May 17, 2011, in connection with the investigation described in Item 5.G. “Operating and Financial Review and Prospects – Recent Developments – Settlement with U.S. governmental authorities” and we undertook several remediation efforts, including voluntary enhancements to our compliance program. If we fail to comply with any term or in any way violate any provision of the settlements, we could be subject to severe sanctions and civil and criminal prosecution.

The cost of complying with environmental regulations and potential environmental and product liabilities may increase our operating costs and negatively impact our business, financial condition, results of operations and prospects.

We are subject to a wide range of local, provincial and national laws, regulations, permit requirements and decrees relating to the protection of human health and the environment, including laws and regulations relating to hazardous materials and radioactive materials and environmental protection governing air emissions, water discharges and waste management. Laws and regulations protecting the environment have become increasingly complex and more stringent and expensive to implement in recent years. Additionally, international environmental requirements vary. While standards in the EU, Canada, and Japan are generally comparable to U.S. standards, other nations, particularly developing nations, including China, have substantially lesser requirements that may give competitors in such nations a competitive advantage. It is possible that any international agreement to regulate emissions may provide exemptions and lesser standards for developing nations. In such case, we may be at a competitive disadvantage relative to competitors having more or all of their production in such developing nations.

Environmental laws and regulations may, in some cases, impose strict liability rendering a person liable for damages to natural resources or threats to public health and safety without regard to negligence or fault. Some environmental laws provide for joint and several strict liability for remediation of spills and releases of hazardous substances. These laws and regulations may expose us to liability for the conduct of or conditions caused by others or for acts that were in compliance with all applicable laws at the time they were performed.

Compliance with applicable requirements and the adoption of new requirements could have a material adverse effect on our consolidated financial condition, results of operations or cash flows. The costs and ultimate impact of complying with environmental laws and regulations are not always clearly known or determinable since regulations under some of these laws have not yet been promulgated or are undergoing revision. The expenditures necessary to remain in compliance with these laws and regulations, including site or other remediation costs, or costs incurred from potential environmental liabilities, could have a material adverse effect on our financial condition and profitability. While we incur and will continue to incur expenditures to comply with applicable laws and regulations, there always remains a risk that environmental incidents or accidents may occur that may negatively affect our reputation or our operations.

Our oil and gas casing, tubing and line pipe products are sold primarily for use in oil and gas drilling, gathering, transportation, processing and power generation facilities, which are subject to inherent risks, including well failures, line pipe leaks, blowouts, bursts and fires, that could result in death, personal injury, property damage, environmental pollution or loss of production. Any of these hazards and risks can result in environmental liabilities, personal injury claims and property damage from the release of hydrocarbons. Similarly, defects in specialty tubing products could result in death, personal injury, property damage, environmental pollution, damage to equipment and facilities or loss of production.

We normally warrant the oilfield products and specialty tubing products we sell or distribute in accordance with customer specifications, but as we pursue our business strategy of providing customers with additional supply chain services, we may be required to warrant that the goods we sell and services we provide are fit for their intended purpose. Actual or claimed defects in our products may give rise to claims against us for losses suffered by our customers and expose us to claims for damages. The insurance we maintain may not be adequate or available to protect us in the event of a claim, its coverage may be limited, canceled or otherwise terminated, or the amount of our insurance may be less than the related impact on enterprise value after a loss. Similarly, our sales of tubes and components for the automobile industry subject us to potential product liability risks that could extend to being held liable for the costs of the recall of automobiles sold by car manufacturers and their distributors.

Risks Relating to the Structure of the Company

As a holding company, the Company’s ability to pay cash dividends depends on the results of operations and financial condition of its subsidiaries and could be restricted by legal, contractual or other limitations.

The Company conducts its operations through subsidiaries. Dividends or other intercompany transfers of funds from those subsidiaries are the Company’s primary source of funds to pay its expenses, debt service and dividends and to repurchase Shares or ADSs.

The ability of the Company’s subsidiaries to pay dividends and make other payments to us will depend on the results of operations and financial condition and could be restricted by applicable corporate and other laws and regulations, including those imposing exchange controls or transfer restrictions, and other agreements and commitments of such subsidiaries. If earnings and cash flows of the Company’s operating subsidiaries are substantially reduced, the Company may not be in a position to meet its operational needs or to pay dividends.

In addition, the Company’s ability to pay dividends to shareholders is subject to legal and other requirements and restrictions in effect at the holding company level. For example, the Company may only pay dividends out of net profits, retained earnings and distributable reserves and premiums, each as defined and calculated in accordance with Luxembourg law and regulations. See Item 8.A. “Financial Information – Consolidated Statements and Other Financial Information – Dividend Policy”.

The Company’s controlling shareholder may be able to take actions that do not reflect the will or best interests of other shareholders.

As of May 31, 2011, San Faustin beneficially owned 60.45% of our Shares. Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin, or RP STAK, controls a significant portion of the voting power of San Faustin and has the ability to influence matters affecting, or submitted to a vote of, the shareholders of San Faustin. As a result, RP STAK is indirectly able to elect a substantial majority of the members of the Company’s board of directors and has the power to determine the outcome of most actions requiring shareholder approval, including, subject to the requirements of Luxembourg law, the payment of dividends. The decisions of the controlling shareholder may not reflect the will or best interests of other shareholders. For example, the Company’s articles of association permit the Company’s board of directors to waive, limit or suppress preemptive rights in certain cases. Accordingly, the Company’s controlling shareholder may cause its board of directors to approve an issuance of Shares for consideration without preemptive rights, thereby diluting the minority interest in the Company. See Item 3.D. “Key Information – Risk Factors – Risks Relating to Shares and ADSs – Holders of Shares and ADSs in the United States may not be able to exercise preemptive rights in certain cases”.

Risks Relating to Shares and ADSs

In deciding whether to purchase, hold or sell Shares or ADSs, you may not have access to as much information about us as you would in the case of a U.S. company.

There may be less publicly available information about us than is regularly published by or about U.S. issuers. Also, Luxembourg corporate and securities regulations governing Luxembourg companies may not be as extensive as those in effect in the United States, and Luxembourg law and regulations in respect of corporate governance matters might not be as protective of minority shareholders

as state corporation laws in the United States. Furthermore, IFRS, the accounting standards in accordance with which we prepare our consolidated financial statements, differ in certain material aspects from U.S. GAAP.

Holders of ADSs may not be able to exercise, or may encounter difficulties in the exercise of, certain rights afforded to shareholders.

Certain shareholders’ rights under Luxembourg law, including the right to vote, to receive dividends and distributions, to bring actions, to examine our books and records and to exercise appraisal rights may not be available to holders of ADSs, or may be subject to restrictions and special procedures for their exercise, as holders of ADSs only have those rights that are expressly granted to them in the deposit agreement. The Bank of New York Mellon, as depositary under the ADS deposit agreement, or the Depositary, through its custodian agent, is the registered shareholder of the deposited Shares underlying the ADSs, and therefore only the Depositary can exercise the shareholders rights in connection with the deposited Shares. For example, if we make a distribution in the form of securities, the Depositary is allowed, at its discretion, to sell that right to acquire those securities on your behalf and instead distribute the net proceeds to you. Also, under certain circumstances, such as our failure to provide the Depositary with voting materials on a timely basis, you may not be able to vote by giving instructions to the Depositary. If the Depositary does not receive voting instructions from the holder of ADS or the instructions are not in proper form, then the Depositary shall deem such holder of ADS to have instructed the Depositary to vote the underlying Shares represented by ADSs in favor of any proposals or recommendations of the Company, for which purposes the Depositary shall issue a proxy to a person appointed by the Company to vote such underlying Shares represented by ADSs in favor of any proposals or recommendations of the Company (including any recommendation by the Company to vote such underlying Shares on any given issue in accordance with the majority shareholder vote on that issue). No instruction shall be deemed given and no proxy shall be given with respect to any matter as to which the Company informs the Depositary that (i) it does not wish such proxy given, (ii) it has knowledge that substantial opposition exists with respect to the action to be taken at the meeting, or (iii) the matter materially and adversely affects the rights of the holders of ADSs.

Holders of Shares and ADSs in the United States may not be able to exercise preemptive rights in certain cases.

Pursuant to Luxembourg corporate law, existing shareholders of the Company are generally entitled to preemptive subscription rights in the event of capital increases and issues of Shares against cash contributions. Under the Company’s articles of association, the board of directors has been authorized to waive, limit or suppress such preemptive subscription rights until August 2, 2012. The Company may, however, issue Shares without preemptive rights only if the newly-issued Shares are issued for consideration other than cash, are issued as compensation to directors, officers, agents or employees of the Company or its affiliates, or are issued to satisfy conversion or option rights created to provide compensation to directors, officers, agents or employees of the Company, its subsidiaries or its affiliates. Holders of ADSs in the United States may, in any event, not be able to exercise any preemptive rights, if granted, for Shares underlying their ADSs unless additional Shares and ADSs are registered under the U.S. Securities Act of 1933, as amended, or the Securities Act, with respect to those rights, or an exemption from the registration requirements of the Securities Act is available. We intend to evaluate, at the time of any rights offering, the costs and potential liabilities associated with the exercise by holders of Shares and ADSs of the preemptive rights for Shares, and any other factors we consider appropriate at the time, and then to make a decision as to whether to register additional Shares. We may decide not to register any additional Share, requiring a sale by the Depositary of the holders’ rights and a distribution of the proceeds thereof. Should the Depositary not be permitted or otherwise be unable to sell preemptive rights, the rights may be allowed to lapse with no consideration to be received by the holders of the ADSs.

It may be difficult to enforce judgments against us in U.S. courts.

The Company is a public limited liability company (société anonyme) organized under the laws of Luxembourg, and most of its assets are located outside the United States. Furthermore, most of the Company’s directors and officers named in this annual report reside outside the United States. As a result, investors may not be able to effect service of process within the United States upon us or our directors or officers or to enforce against us or them in U.S. courts judgments predicated upon the civil liability provisions of U.S. federal securities law. Likewise, it may be difficult for a U.S. investor to bring an original action in a Luxembourg court predicated upon the civil liability provisions of the U.S. federal securities laws against the Company, directors and officers. There is also

uncertainty with regard to the enforceability of original actions in courts outside the United States of civil liabilities predicated upon the civil liability provisions of U.S. federal securities laws. Furthermore, the enforceability in courts outside the United States of judgments entered by U.S. courts predicated upon the civil liability provisions of U.S. federal securities law will be subject to compliance with procedural requirements under applicable local law, including the condition that the judgment does not violate the public policy of the applicable jurisdiction.

Item 4.

Information on the Company

Overview

We are a leading global manufacturer and supplier of steel pipe products and related services for the world’s energy industry and for other industrial applications. Our customers include most of the world’s leading oil and gas companies as well as engineering companies engaged in constructing oil and gas gathering, transportation, processing and power generation facilities. Our principal products include casing, tubing, line pipe, and mechanical and structural pipes.

Over the last two decades, we have expanded our business globally through a series of strategic investments. We now operate an integrated worldwide network of steel pipe manufacturing, research, finishing and service facilities with industrial operations in the Americas, Europe, Asia and Africa and a direct presence in most major oil and gas markets.

Our mission is to deliver value to our customers through product development, manufacturing excellence, and supply chain management. We seek to minimize risk for our customers and help them reduce costs, increase flexibility and improve time-to-market. Our employees around the world are committed to continuous improvement by sharing knowledge across a single global organization.

A. History and Development of the Company

The Company

Our holding company’s legal and commercial name is Tenaris S.A. The Company was established as a public limited liability company (société anonyme) organized under the laws of the Grand Dutch of Luxembourg. The Company’s registered office is located at 29 avenue de la Porte-Neuve, 3rd Floor, L-2227, Luxembourg, telephone (352) 2647-8978. Its agent for U.S. federal securities law purposes is Tenaris Global Services (U.S.A.) Corporation, located at 2200 West Loop South, Suite 8000, Houston, TX 77027.

Tenaris

Tenaris began with the formation of Siderca S.A.I.C., or Siderca, the sole Argentine producer of seamless steel pipe products, by San Faustin’s predecessor in Argentina in 1948. Siat, an Argentine welded steel pipe manufacturer, was acquired in 1986. We grew organically in Argentina and then, in the early 1990s, began to evolve beyond this initial base into a global business through a series of strategic investments. These investments included the acquisition, directly or indirectly, of controlling or substantial interests in the following companies:

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Tubos de Acero de México S.A., or Tamsa, the sole Mexican producer of seamless steel pipe products (June 1993);

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Dalmine S.p.A., or Dalmine, a leading Italian producer of seamless steel pipe products (February 1996);

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Tavsa, the sole Venezuelan producer of seamless steel pipe products (October 1998)¹;

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Confab Industrial S.A., or Confab, the leading Brazilian producer of welded steel pipe products (August 1999);

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NKKTubes, a leading Japanese producer of seamless steel pipe products (August 2000);

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Algoma Tubes Inc., or AlgomaTubes, the sole Canadian producer of seamless steel pipe products (October 2000);

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S.C. Silcotub S.A., or Silcotub, a leading Romanian producer of seamless steel pipe products (July 2004);

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Maverick, a leading North American producer of welded steel pipe products with operations in the United States, Canada and Colombia (October 2006);

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Hydril, a leading North American manufacturer of premium connection products for oil and gas drilling production (May 2007); and

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SPIJ, an Indonesian OCTG processing business with heat treatment and premium connection threading facilities (April 2009).

In addition, we have established a global network of pipe finishing, distribution and service facilities with a direct presence in most major oil and gas markets and a global network of research and development centers.

B. Business Overview

Our business strategy is to continue expanding our operations worldwide and further consolidate our position as a leading global supplier of high-quality tubular products and services to the energy and other industries by:

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pursuing strategic investment opportunities in order to strengthen our presence in local and global markets;

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expanding our comprehensive range of products and developing new high-value products designed to meet the needs of customers operating in increasingly challenging environments;

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securing an adequate supply of production inputs and reducing the manufacturing costs of our core products; and

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enhancing our offer of technical and pipe management services designed to enable customers to optimize their selection and use of our products and reduce their overall operating costs.

Pursuing strategic investment opportunities and alliances

We have a solid record of growth through strategic investments and acquisitions. We pursue selective strategic investments and acquisitions as a means to expand our operations and presence in selected markets, enhance our global competitive position and capitalize on potential operational synergies. Our track record on acquisitions is described above (See Item 4.“Information on the Company - History and Development of the Company - Tenaris”).

¹	In 2009, the Venezuelan government announced the nationalization of Tavsa. For more information on the Tavsa nationalization process, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Developing high-value products

We have developed an extensive range of high-value products suitable for most of our customers’ operations using our network of specialized research and testing facilities and by investing in our manufacturing facilities. As our customers expand their operations, we seek to supply high-value products that reduce costs and enable our customers to operate safely in increasingly challenging environments.

Securing inputs for our manufacturing operations

We seek to secure our existing sources of raw material and energy inputs, and to gain access to new sources, of low-cost inputs which can help us maintain or reduce the cost of manufacturing our core products over the long term.

Enhancing our offer of technical and pipe management services

We continue to enhance our offer of technical and pipe management services for our customers worldwide. Through the provision of these services, we seek to enable our customers to optimize their operations, reduce costs and to concentrate on their core businesses. They are also intended to differentiate us from our competitors and further strengthen our relationships with our customers worldwide through long-term agreements.

Our Competitive Strengths

We believe our main competitive strengths include:

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our global production, commercial and distribution capabilities, offering a full product range with flexible supply options backed up by local service capabilities in important oil and gas producing and industrial regions around the world;

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our ability to develop, design and manufacture technologically advanced products;

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our solid and diversified customer base and historic relationships with major international oil and gas companies around the world, and our strong and stable market shares in the countries in which we have manufacturing operations;

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our proximity to our customers;

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our human resources around the world with their diverse knowledge and skills;

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our low-cost operations, primarily at state-of-the-art, strategically located production facilities with favorable access to raw materials, energy and labor, and 50 years of operating experience; and

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our strong financial condition.

Business Segments

Our business is organized in two major business segments: Tubes and Projects, which are also our reportable operating segments.

In identifying our reportable operating segments, we considered the nature of our products and services, the nature of our production processes, the type or class of customer for our products and services, the method used to distribute our products or provide the related services, the economic characteristics and financial effects of our business activities, and the related economic environment in which we operate.

The Tubes segment includes the production and sale of both seamless and welded steel tubular products and related services mainly
for the oil and gas industry, particularly oil country tubular goods (OCTG) used in drilling operations, and for other industrial applications with production processes that consists in the transformation of steel into tubular products. Business activities included in

this segment are mainly dependent on the oil and gas industry worldwide, as this industry is a major consumer of steel pipe products, particularly OCTG used in drilling activities. Demand for steel pipe products from the oil and gas industry has historically been volatile and depends primarily upon the number of oil and natural gas wells being drilled, completed and reworked, and the depth and drilling conditions of these wells. Sales are generally made to end users, with exports being done through a centrally managed global distribution network and domestic sales made through local subsidiaries.

The Projects segment includes the production and sale of welded steel pipe products mainly used in the construction of major pipeline projects for the transportation of gas and fluids with a production process that consists in the transformation of steel into large diameter welded tubular products, including SAW process and specific coating for most of the products. Pipeline projects are typically spread along hundreds of kilometers and are subject to specific government policies and other regulations. Accordingly, this business depends to a large extent on the number of active pipeline projects (and not on the level of drilling activity), particularly in the South American regional market, which is the region from which most revenues in this segment are derived. To a significant extent, products are distributed directly to end customers through local subsidiaries. Orders are generally for significant volumes of product and require deliveries over an extended period of time.

The Other segment includes all other business activities and operating segments that are not required to be separately reported, including the production and selling of sucker rods, welded steel pipes for electric conduits, industrial equipment and raw materials that exceed our internal requirements.

Our Products

Our principal finished products are seamless and welded steel casing and tubing, line pipe and various other mechanical and structural steel pipes for different uses. Casing and tubing are also known as oil country tubular goods or OCTG. In our Projects business segment we also produce large diameter welded steel pipes for oil and gas pipelines. We manufacture our steel pipe products in a wide range of specifications, which vary in diameter, length, thickness, finishing, steel grades, threading and coupling. For most complex applications, including high pressure and high temperature applications, seamless steel pipes are usually specified and, for some standard applications, welded steel pipes can also be used.

Casing. Steel casing is used to sustain the walls of oil and gas wells during and after drilling.

Tubing. Steel tubing is used to conduct crude oil and natural gas to the surface after drilling has been completed.

Line pipe. Steel line pipe is used to transport crude oil and natural gas from wells to refineries, storage tanks and loading and distribution centers.

Mechanical and structural pipes. Mechanical and structural pipes are used by general industry for various applications, including the transportation of other forms of gas and liquids under high pressure.

Cold-drawn pipe. The cold-drawing process permits the production of pipes with the diameter and wall thickness required for use in boilers, superheaters, condensers, heat exchangers, automobile production and several other industrial applications.

Premium joints and couplings. Premium joints and couplings are specially designed connections used to join lengths of steel casing and tubing for use in high temperature or high pressure environments. A significant portion of our steel casing and tubing products are supplied with premium joints and couplings. We own an extensive range of premium connections, and following the integration of Hydril’s premium connections business, we market our premium connection products under the TenarisHydril brand name. In addition, we hold licensing rights to manufacture and sell the Atlas Bradford range of premium connections outside the United States.

Coiled tubing. Coiled tubing is used for oil and gas drilling and well workovers and for subsea pipelines.

Other Products. We also manufacture sucker rods used in oil extraction activities, welded steel pipes for electric conduits used in the construction industry, and industrial equipment of various specifications and diverse applications, including liquid and gas storage equipment. In addition, we sell raw materials that exceed our internal requirements.

Production Process and Facilities

We operate relatively low-cost production facilities, which we believe is the result of:

•

state-of-the-art, strategically located plants;

•

favorable access to high quality raw materials, energy and labor at competitive costs;

•

operating history of 50 years, which translates into solid industrial know-how;

•

constant benchmarking and best-practices sharing among the different facilities;

•

increasing specialization of each of our facilities in specific product ranges; and

•

extensive use of information technology in our production processes.

Our seamless pipes production facilities are located in North and South America, Europe and Asia and our welded pipes production facilities are located in North and South America. In addition, we manufacture welded steel pipes for electric conduits in the United States and Colombia, tubular accessories such as sucker rods (used in oil drilling) at facilities in Argentina and Brazil, couplings in the United States, Argentina, China, Indonesia, México and Romania, and pipe fittings in Mexico. In addition to our pipe threading and finishing facilities at our integrated pipe production facilities, we also have pipe threading facilities, for production of American Petroleum Institute, or API, and premium joints in the United States, Canada, China, Indonesia, Nigeria, the United Kingdom and Saudi Arabia.

The following table shows our aggregate installed production capacity of seamless and welded steel pipes and steel bars at the dates indicated as well as the aggregate actual production volumes for the periods indicated. The figures for effective annual capacity are based on our estimates of effective annual production capacity under present conditions.


	At or for the year ended December 31,
	2010		2009		2008
Thousands of tons

Steel Bars
Effective Capacity (annual)⁽¹⁾		3,450		3,450		3,450
Actual Production		2,800		1,744		3,082
Tubes - Seamless
Effective Capacity (annual)⁽¹⁾		3,320		⁽²⁾3,320		3,400
Actual Production		2,399		1,770		3,005
Tubes - Welded
Effective Capacity (annual)⁽¹⁾		1,860		1,860		1,860
Actual Production		772		249		999
Projects - Welded
Effective Capacity (annual)⁽¹⁾		850		850		850
Actual Production		230		291		548

(1)	Effective annual production capacity is calculated based on standard productivity of production lines, theoretical product mix allocations and assuming the maximum number of possible working shifts and a continued flow of supplies to the production process.

(2)	Our Tubes-Seamless effective capacity decreased 80,000 tons in 2009, due to the nationalization of Tavsa.

Production Facilities - Tubes

North America

In North America, we have a fully integrated seamless pipe manufacturing facility, a threading plant and a pipe fittings facility in Mexico, three welded pipe manufacturing facilities, two coiled tubing facilities, three threading plants and a couplings manufacturing facility in the United States, and a seamless pipe rolling mill, a welded pipe manufacturing facility and two threading plants in Canada.

Mexico

In Mexico, our fully integrated seamless pipe manufacturing facility is located near the major exploration and drilling operations of Mexican state oil company Petróleos Mexicanos, or Pemex, about 13 kilometers from the port of Veracruz on the Gulf of Mexico. Situated on an area of 450 hectares, the plant includes a state-of-the-art seamless pipe mill and has an installed annual production capacity of approximately 780,000 tons of seamless steel pipes (with an outside diameter range of 2 to 20 inches) and 850,000 tons of steel bars. The plant is served by two highways and a railroad and is close to the port of Veracruz, which reduces transportation costs and facilitates product shipments to export markets.

The Veracruz facility comprises:

•

a steel shop, including an electric arc furnace, refining equipment, vacuum degassing, four-strand continuous caster and a cooling bed;

•

a multi-stand pipe mill, including a rotary furnace, direct piercing equipment, mandrel mill with retained mandrel, sizing mill and a cooling bed;

•

a pilger pipe mill, including a rotary furnace, direct piercing equipment, a reheating furnace, sizing mill and a cooling bed;

•

four finishing lines, including heat treatment facilities, upsetting machines and threading and inspection equipment;

•

a stretch reducing mill, including cutting saws and a cooling bed;

•

a cold-drawing mill; and

•

automotive components production machinery.

The major operational units at the Veracruz facility and the corresponding effective annual production capacity (in thousands of tons per year, except for the auto components facility, which is in millions of parts) as of December 31, 2010, are as follows:


	Effective Production Capacity (annual)⁽¹⁾
Steel Shop		850
Pipe Production
Multi-Stand Pipe Mill		700
Pilger Mill		80
Cold-Drawing Mill		35
Auto Components Facility		30

(1)	Effective annual production capacity is calculated based on standard productivity of production lines, theoretical product mix allocations and assuming the maximum number of possible working shifts and a continued flow of supplies to the production process.

In 2007, as part of the acquisition of Hydril, we incorporated into our Mexican operations a threading plant in Veracruz, which produces premium connections and accessories.

In addition to the previously described facilities, in Veracruz, Mexico, we are completing the construction of a new small diameter seamless pipe rolling mill, adjacent to our existing facility. The new rolling mill is the main component in a realignment of Tenaris’s industrial system worldwide, which will make operations more efficient and reduce their environmental impact. The new seamless pipes facility was built in an area that extends over more than 200 hectares. The new plant, with a production capacity of 450,000 tons per year as well as premium threading, finishing and heat treatment lines, incorporates the latest rolling technology and will produce from 2³/8 up to 7 inches seamless pipe. The new facility required an investment of approximately $850 million over two years, focusing on building a competitive and state-of-the-art rolling mill as well as premium threading, finishing and heat treatment lines.

In addition to the Veracruz facilities, we operate a manufacturing facility near Monterrey in the state of Nuevo León, Mexico, for the production of weldable pipe fittings. This facility has an annual production capacity of approximately 15,000 tons.

United States

In the United States we have the following production facilities:

Hickman, Arkansas: Our main U.S. production facility, covering an area of 78 hectares. This facility processes steel coils to produce electric resistance welded, or ERW, OCTG and line pipe with an outside diameter range from 1¹/2 to 16 inches and has an annual production capacity of approximately 900,000 tons. It includes:

•

A plant comprising two mills producing 1¹/2 through 5¹/2 inches API products with three finishing lines and two heat treatment lines;

•

A plant comprising two mills producing 3¹/2 through 16 inches API products with two finishing lines; and

•

A coating facility coating sizes up to 16 inches.

Conroe, Texas: A plant located on an area of 47 hectares which processes steel coils to produce ERW OCTG and line pipe, with an outside diameter range of 4¹/2 to 8⁵/8 inches and has an annual production capacity of approximately 250,000 tons. The facility includes one mill, one heat treatment line and one finishing line.

Counce, Tennessee: A plant located on an area of 54 hectares which processes steel coils to produce ERW OCTG and line pipe with an outside diameter range of 4¹/2 to 8⁵/8 inches and has an annual production capacity of approximately 90,000 tons. The facility has one mill and a finishing line capable of producing line pipe products.

In addition, we have specialized facilities in the Houston area producing coiled tubing, umbilical tubing and couplings.

•

A coiled tubing facility of approximately 150,000 square feet of manufacturing space on 4 hectares. The plant consists of two mills and coating operations capable of producing coiled tubing products in various grades, sizes and wall thicknesses.

•

An umbilical tubing facility of approximately 85,000 square feet of manufacturing space on 6 hectares. The facility is capable of producing stainless or carbon steel tubing in various grades, sizes and wall thickness.

•

The Texas Arai coupling facility with an annual capacity of approximately 4.4 million couplings in OCTG sizes ranging from 2³/8 through 20 inches in carbon and alloy steel grades.

Furthermore, as part of the acquisition of Hydril, we added the following threading facilities, which are mainly dedicated to the finishing of tubes with premium connections:

•

McCarty: a threading facility in Houston, Texas, which comprises two main production buildings in an area of approximately 20 hectares;

•

Westwego: a threading facility located in Louisiana; and

•

Bakersfield: a threading facility in California, mainly used as a repair shop.

Canada

In Canada, we have a seamless steel pipe manufacturing facility located in Sault Ste. Marie, near the mouth of Lake Superior in the province of Ontario. The facility includes a retained mandrel mill, a stretch reducing mill and heat treatment and finishing facilities producing seamless pipe products with an outside diameter range of 2 to 9⁷/8 inches. The effective annual production capacity of the facility is approximately 250,000 tons. The plant was operated as part of Algoma Steel until shortly before it was leased to us in 2000. In February 2004, we completed the purchase of the leased facilities, spare parts and other operating assets. Since we began operating the facility, we have sourced steel bars principally from our steel shops in Argentina and Mexico. In 2007, we signed a 10-year contract with Rio Tinto Fer et Titane (ex-QIT), a Canadian producer of titanium dioxide and high purity iron, under which Rio Tinto Fer et Titane supplies up to 100,000 tons of round steel bars per year at U.S. dollar prices which is adjusted in accordance with variations in raw material costs. We use steel bars produced in our integrated facilities in Argentina, Mexico and Romania for the remainder of our round steel bar requirements.

We also own a welded steel pipe manufacturing facility located in Calgary, Alberta, which processes steel coils into ERW OCTG and line pipe with an outside diameter range of 2³/8 to 12³/4 inches. The facility includes a slitter, three welding lines and four threading lines. The effective annual production capacity of this plant is approximately 400,000 tons.

Since the acquisition of Hydril in 2007, we have a threading facility in Nisku, Alberta, near the center of Western Canadian drilling area. The facility is dedicated to premium connections and accessories including related repairs. In 2010, we closed a repair shop in Dartmouth, Nova Scotia. At the same time, we entered into a lease agreement for the equipment with a third party in Nova Scotia so that we can continue to provide this service to the East Coast.

South America

In South America, we have a fully integrated seamless pipe facility in Argentina. In addition, we have Tubes’s welded pipe manufacturing facilities in Argentina and Colombia.

Argentina

Our principal manufacturing facility in South America is a fully integrated plant on the banks of the Paraná river near the town of Campana, approximately 80 kilometers from the City of Buenos Aires, Argentina. Situated on over 300 hectares, the plant includes a state-of-the-art seamless pipe facility and has an effective annual production capacity of approximately 900,000 tons of seamless steel pipe (with an outside diameter range of 1¹/4 to 10³/4 inches) and 1,300,000 tons of steel bars.

The Campana facility comprises:

•

a direct reduced iron, or DRI, production plant;

•

a steel shop with two production lines, each including an electric arc furnace, refining equipment, four-strand continuous caster and a cooling bed;

•

two continuous mandrel mills, each including a rotary furnace, direct piercing equipment and a cooling bed and one of them also including a stretch reducing mill;

•

seven finishing lines, including heat treatment facilities, upsetting machines, threading and inspection equipment and make-up facilities;

•

a cold-drawing mill; and

•

a port on the Paraná river for the supply of raw materials and the shipment of finished products.

In Argentina, we have a modern gas turbine power generation plant, located in San Nicolás, approximately 150 kilometers from Campana. The 160 megawatt capacity of this power generation plant together with a smaller thermo-electric power generating plant located within the Campana facility, is sufficient to supply all of the electric power requirements of the Campana facility.

The major operational units at the Campana facility and corresponding effective annual production capacity (in thousands of tons per year) as of December 31, 2010, are as follows:


	Effective Production Capacity (annual)⁽¹⁾
DRI		935

Steel Shop
Continuous Casting I		530
Continuous Casting II		770

Pipe Production
Mandrel Mill I		330
Mandrel Mill II		570

Cold-Drawing Mill		20

(1)	Effective annual production capacity is calculated based on standard productivity of production lines, theoretical product mix allocations and assuming the maximum number of possible working shifts and a continued flow of supplies to the production process.

In addition to our main integrated seamless pipe facility, we also have a welded pipe manufacturing facility in Argentina located at Villa Constitución in the province of Santa Fe. The facility has an annual production capacity of approximately 80,000 tons of welded pipes with an outside diameter range of 1 to 6 inches.

Colombia

In Colombia we have the TuboCaribe welded pipe manufacturing facility in Cartagena, on an area of 28 hectares. The total estimated annual production capacity is approximately 140,000 tons. The plant produces mainly ERW OCTG and line pipe products having two mills with an outside diameter range of 2³/8 to 9⁵/8 inches, three heat treatment lines and three threading lines. Inspection lines and materials testing laboratories complete the production facility. A 2 to 42 inches diameter multilayer coating facility complements our line pipe production facilities.

Europe

In Europe, we have several seamless pipe manufacturing facilities in Italy and one in Romania and a premium connection threading facility in the United Kingdom.

Italy

Our principal manufacturing facility in Europe is an integrated plant located in the town of Dalmine in the industrial region of Bergamo, about 40 kilometers from Milan in northern Italy. Situated on an area of 150 hectares, the plant includes a state-of-the-art seamless pipe mill and has an annual production capacity of approximately 800,000 tons of seamless steel pipes and 900,000 tons of steel bars.

The Dalmine facility comprises:

•

a steel shop, including an electric arc furnace, two ladle furnaces, one vacuum degassing, two continuous casters and a cooling bed;

•

a continuous floating mandrel mill with one heat treatment and two finishing lines;

•

a retained mandrel mill with three finishing lines including two heat treatments;

•

a rotary expander with a finishing line including a heat treatment; and

•

a pilger pipe mill with a finishing line.

The major operational units at the Dalmine facility and corresponding effective annual production capacity (in thousands of tons per year) as of December 31, 2010, are as follows:


	Effective Production Capacity (annual) ⁽¹⁾
Steel Shop		900
Pipe Production
Pilger Mill		10
Mandrel Mill:
Floating Mandrel Mill Small Diameter		140
Retained Mandrel Mill Medium Diameter (plus Rotary Expander for Large Diameter)		650

(1)	Effective annual production capacity is calculated based on standard productivity of production lines, theoretical product mix allocations and assuming the maximum number of possible working shifts and a continued flow of supplies to the production process.

The Dalmine facility manufactures seamless steel pipes with an outside diameter range of 21 to 711 mm (0.75 to 28.00 inches), mainly from carbon, low alloy and high alloy steels for diverse applications. The Dalmine facility also manufactures steel bars for processing at our other facilities in Italy.

Our production facilities located in Italy have a collective annual production capacity of approximately 950,000 tons of seamless steel pipes. Aside from the main facility mentioned above, they include:

•

the Costa Volpino facility, which covers an area of approximately 31 hectares and comprises a cold-drawing mill and an auto components facility producing cold-drawn carbon, low alloy and high alloy steel pipes with an outside diameter range of 12 to 280 mm (0.47 to 11.00 inches), mainly for automotive, mechanical and machinery companies in Europe. The Costa Volpino facility has an annual production capacity of approximately 100,000 tons;

•

the Arcore facility, which covers an area of approximately 26 hectares and comprises a Diescher mill with associated finishing lines. Production is concentrated in heavy-wall mechanical pipes with an outside diameter range of 48 to 219 mm (1.89 to 8.62 inches). The Arcore facility has an annual production capacity of approximately 150,000 tons; and

•

the Piombino facility, which covers an area of approximately 67 hectares and comprises, a hot dip galvanizing line and associated finishing facilities. Production is focused on finishing of small diameter seamless pipe for plumbing applications in the domestic market, such as residential water and gas transport. The Piombino facility has an annual production capacity of approximately 100,000 tons.

In addition to these facilities, we operate a manufacturing facility at Sabbio, which manufactures gas cylinders with an annual production capacity of approximately 14,000 tons or 270,000 pieces.

In order to reduce the cost of electrical energy at our operations in Dalmine, we constructed a gas-fired, combined heat and power station with a capacity of 120 MW at Dalmine. This facility began operations in May 2007. Our operations in Dalmine consume most of the power generated at the plant which is designed to have sufficient capacity to meet the electric power requirements of these operations at peak load. Excess power is sold to third party consumers and heat is sold for district heating.

Romania

We have a seamless steel pipe manufacturing facility in Romania, located in the city of Zalau, near the Hungarian border, 480 kilometers from Bucharest. The Silcotub facility includes a continuous mandrel mill and has an annual production capacity of approximately 180,000 tons of seamless steel tubes. The plant produces carbon and alloy steel tubes with an outside diameter range of 8 to 146 mm (0.314 to 5.74 inches). We also have a steelmaking facility in southern Romania, with an annual steelmaking capacity of 400,000 tons. Following investments to convert this capacity to the production of steel bars for seamless pipe production, this facility has been integrated into our Romanian and European operations and in February 2006 began to supply steel bars to the Silcotub facility as well as to Dalmine’s facilities in Italy. The combined Romanian facilities comprise:

•

a steel shop including an electric arc furnace, a ladle furnace and a continuous caster;

•

a continuous mandrel mill;

•

three finishing lines, including heat treatment facilities, upsetting machine, line pipe, threading, make-up and inspection equipment facilities;

•

a coupling shop;

•

a cold-drawing plant with finishing area; and

•

automotive and hydraulic cylinders components’ production machinery.

Middle East and Africa

In 2010, we began operating a newly constructed threading facility for the production of premium joints and accessories in Saudi Arabia. The facility has an annual production capacity of approximately 40,000 tons of premium joints.

In Nigeria we have a facility dedicated to the production of premium joints and couplings in Onne, where we are consolidating our operations in the area (previously distributed between Onne and Warri). This plant comprises a threading facility for both API and premium connections with an annual production capacity of approximately 40,000 tons, inspection facilities and a stockyard. In addition, the Warri threading facility will be reconverted into a repair shop to enlarge our services and better support our customer base.

Far East and Oceania

Our seamless pipe manufacturing facility in Asia, operated by NKKTubes, is located in Kawasaki, Japan, in the Keihin steel complex owned by JFE, the successor company of NKK that resulted from the business combination of NKK with Kawasaki Steel Corporation, or Kawasaki Steel. The facility includes a floating mandrel mill, a plug mill and heat treatment and upsetting and threading facilities producing seamless pipe products with an outside diameter range of 1 to 17 inches. The effective annual production capacity of the facility is approximately 260,000 tons. The plant was operated by NKK until its acquisition by NKKTubes in 2000. Steel bars and other essential inputs and services are supplied by JFE, which retains a 49% interest in NKKTubes through its subsidiary JFE Engineering. The NKKTubes facility produces a wide range of carbon, alloy and stainless steel pipes for the local market and high value-added products for export markets. The NKKTubes facility was not affected by the March 2011 earthquake in Japan. For a discussion of NKK’s business combination with Kawasaki Steel, see Item 4.B. “Information on the Company – Business overview – Competition”.

In 2006, we began operating a newly constructed facility for the production of premium joints and couplings in Qingdao, on the east coast of China. The facility has an annual production capacity of approximately 40,000 tons of premium joints.

In addition, in Indonesia we have a premium joints threading facility in the state of Batam, which we integrated to our operations following the acquisition of Hydril in 2007. In April 2009, we acquired a 77.45% holding in SPIJ, an Indonesian OCTG processing business with heat treatment, premium connection threading facilities and coupling shop, which has an annual processing capacity of approximately 120,000 tons.

Production Facilities - Projects

We have two major welded pipe facilities, one in Brazil and one in Argentina, which produce pipes mainly used in the construction of major pipeline projects. The facility in Brazil, operated by Confab, is located at Pindamonhangaba, 160 kilometers from the city of São Paulo. The facility includes an ERW rolling mill and a SAW (submerged arc welding) rolling mill with one spiral line and one longitudinal line. The facility, which was originally opened in 1959, processes steel coils and plates to produce welded steel pipes with an outside diameter range of 4¹/2 to 100 inches for various applications, including oil, petrochemical and gas applications. The facility also supplies anticorrosion pipe coating made of extruded polyethylene or polypropylene, external and internal fusion bonded epoxy and paint for internal pipe coating. The facility has an annual production capacity of approximately 500,000 tons.

The facility in Argentina is located at Valentín Alsina just south of the city of Buenos Aires. The facility includes ERW and SAW rolling mills with one spiral line. The facility was originally opened in 1948 and processes steel coils and plate to produce welded steel pipes with an outside diameter range of 4¹/2 to 80 inches, which are used for the conveying of fluids at low, medium and high pressure and for mechanical and structural purposes. The facility has an annual production capacity of approximately 350,000 tons.

Production Facilities - Others

We have facilities for the manufacture of sucker rods in the city of Villa Mercedes, San Luis, Argentina and in Moreira Cesar, São Paulo, Brazil. In Moreira Cesar, we also have facilities for the manufacture of industrial equipment. As part of the acquisition of Maverick in 2006, we integrated a welded steel pipe business for electric conduits with manufacturing facilities in Louisville, Kentucky, Cedar Springs, Georgia and Cartagena, Colombia. These plants process steel coils into conduit tubing and have a combined annual production capacity of approximately 240,000 tons.

Sales and Marketing

Net Sales

Our total net sales amounted to $7,712 million in 2010, compared to $8,149 million in 2009 and $11,988 million in 2008. For further information on our net sales see Item 5.A. “Operating and Financial Review and Prospects – Results of Operations”.

The following table shows our net sales by business segment for the periods indicated therein:


*Millions of U.S. dollars*	For the year ended December 31,
	2010				2009				2008
Tubes		6,676.4	87	%		6,670.9	82	%		10,010.1	84	%
Projects		428.8	6	%		986.5	12	%		1,270.9	11	%
Others		606.4	8	%		491.8	6	%		706.8	6	%

Total		7,711.6	100	%		8,149.3	100	%		11,987.8	100	%

Tubes

The following table indicates, for our Tubes business segment, net sales by geographic region:


	For the year ended December 31,
*Millions of U.S. dollars*	2010				2009				2008
Tubes
North America		3,121.7	47	%		2,756.1	41	%		4,519.3	45	%
South America		1,110.1	17	%		981.9	15	%		1,248.7	12	%
Europe		746.6	11	%		828.8	12	%		1,705.6	17	%
Middle East and Africa		1,263.6	19	%		1,622.6	24	%		1,809.9	18	%
Far East and Oceania		434.4	7	%		481.5	7	%		726.6	7	%

Total Tubes		6,676.4	100	%		6,670.9	100	%		10,010.1	100	%

North America

Sales to customers in North America accounted for 47% of our sales of tubular products and services in 2010, compared to 41% in 2009 and 45% in 2008.

We have significant sales in each of the United States, Canada and Mexico. During the last few years, we have established a leading position in the U.S. market with an integrated product and service offering, following the acquisitions of Maverick and Hydril in 2006 and 2007, respectively.

The use of welded OCTG products in less complex applications has become well established in the United States and Canada due to the standard product specifications required, the development of ERW technology and the marketing efforts of local welded pipe producers.

Sales to our oil and gas customers in the United States and Canada are sensitive to oil prices and North American natural gas prices. Due to the relative weakness in the price of natural gas compared with the price of oil, drilling activity historically dedicated to natural gas, has switched to the exploration and production of oil. In the past two years, an increase in the drilling of productive shale gas reserves, made possible by drilling technology developments, has led to a reduction in conventional gas drilling activity and has resulted in a fourth consecutive year of increasing U.S. gas production in spite of a reduction in overall gas drilling activity compared to the previous five years. Demand for OCTG products for use in more complex shale gas applications has increased while demand for standard OCTG products for use in conventional gas applications has declined. A similar trend is underway in the Canadian market.

During 2010, demand for our OCTG products in the United States and Canada increased led by substantially higher oil drilling activity along with increased investments in natural gas shales and liquid rich plays and due to a lower level of imports of Chinese products, following the introduction by the United States and Canadian governments of antidumping and countervailing duties on the import of Chinese OCTG products.

Our sales in the United States are also affected by the level of investment of oil and gas companies in exploration and production in offshore projects. The blow-out at the Macondo well in the U.S. Gulf of Mexico and the consequent spillage of substantial quantities of oil resulted in a moratorium that halted drilling activity. The drilling moratorium was lifted in October 2010, when new regulations affecting offshore exploration and development activities were announced. Drilling activities in shallow waters have gradually picked up, whereas deep-water activity has remained very low compared to pre-Macondo levels.

In the past, our sales to oil and gas customers in the United States have been affected by antidumping duties which were applied since 1995 in respect to the import of OCTG products produced by our main seamless pipe manufacturing subsidiaries. In May 2007, the U.S. International Trade Commission voted to revoke these antidumping duties. Consequently, for the time being there are no antidumping duty orders in force affecting Tenaris OCTG products.

Oil and gas drilling in Canada is subject to strong seasonality with the peak drilling season in Western Canada being during the winter months when the ground is frozen. During the spring, as the ice melts, drilling activity is severely restricted by the difficulty of moving equipment in muddy terrain.

In Mexico, we have enjoyed a long and mutually beneficial relationship with Pemex, the state-owned oil company, one of the world’s largest crude oil and condensates producers. In 1994, we began supplying Pemex under just-in-time, or JIT, agreements, which allow us to provide it with comprehensive pipe management services on a continuous basis. These agreements provide for delivery of pipe to our customers on short notice, usually within 72 hours. Under JIT and stocking supply arrangements, we are kept informed of our customers’ drilling program and pipe requirements. In addition, we are permitted to bring our engineers to the customers’ drilling locations in order to maintain adequately supplied warehouse inventories.

In 2010, drilling activity in Mexico declined, following increases in the previous two years, as low production rates at the Chicontepec reserve has led Pemex to curtail the pace of the drilling program that it had previously initiatied for the development of the reserve in response to declining oil production from Mexico’s principal field. In addition, low North American natural gas prices also led to a reduction of drilling activity in the Burgos basin in the north of the country.

Sales to non-oil related customers in Mexico are made directly to those customers or through authorized distributors. The principal Mexican end users, other than Pemex, rely on our products primarily for automotive, thermal, mechanical, conduction and hydraulic uses. Sales to these non-oil customers are primarily affected by trends in North American industrial production activity.

South America

Sales to customers in South America accounted for 17% of our sales of tubular products and services in 2010, compared to 15% in 2009 and 12% in 2008.

Our largest markets in South America are Argentina, Colombia and Venezuela. We also have significant sales in Ecuador and Peru. Our sales in Brazil are included in our Projects and Others segments.

We have manufacturing subsidiaries in Argentina and Colombia. Our seamless pipe manufacturing facility in Venezuela was nationalized in 2009. For more information on the nationalization of this Venezuelan company, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Our sales in South America are sensitive to the international price of oil and its impact on the drilling activity of participants in the oil and gas sectors, as well as to general economic conditions in these countries. In addition, sales in Argentina, as well as export sales from our manufacturing facilities in Argentina, are affected by governmental actions and policies, including measures adopted in 2002 in response to the crisis in Argentina, such as the taxation of oil and gas exports, measures affecting gas prices in the domestic market, restrictions on certain transfers of currency abroad, mandatory repatriation of export revenues and other matters affecting the investment climate. Sales in Venezuela are also affected by governmental actions and policies and their consequences, such as

nationalization and other measures relating to the taxation and ownership of oil and gas production activities, general strikes, agreements to vary domestic production pursuant to quotas established by the Organization of the Petroleum Exporting Countries, or OPEC, and other matters affecting the investment climate. See Item 3.D. “Key Information – Risk Factors – Risks Relating to our Business – Adverse economic or political conditions in the countries where we operate or sell our products and services may decrease our sales or disrupt our manufacturing operations, thereby adversely affecting our revenues, profitability and financial condition”.

A principal component of our marketing strategy in South American markets is the establishment of long-term supply agreements with local and international oil and gas companies operating in those markets.

In 2010, drilling activity and demand from oil and gas customers recovered in Argentina from the decline in 2009, led by an increase in oil-related drilling, and returned to the level shown in 2008. However, growth in oil and gas activity and supply has been affected by governmental actions including the application of additional taxes on the export of oil and gas and the freezing for an extended period of domestic gas tariffs for consumers. More recently, the government has put in place programs to encourage new exploration and production activity and recently RepsolYPF, the leading oil and gas operator in Argentina, has announced significant discoveries of unconventional reserves.

In Colombia, we have established a leading position in the market for OCTG products in the past three years following the acquisition of TuboCaribe, a welded pipe manufacturing facility located in Cartagena. The market in the past few years has grown rapidly as the country encouraged investment in its hydrocarbon industry and opened its national oil company to private investment. In 2010, drilling activity increased together with demand for pipes. Our principal customer in Colombia is Ecopetrol whose operations we supply under a JIT arrangement.

In Venezuela, we have a significant share of the market for OCTG products. We enjoy ongoing business relationships with PDVSA and the joint venture operators in the oil and gas sector. In 2010, our sales in Venezuela were negatively affected as PDVSA delayed payments to suppliers. See Item 3.D. “Key Information—Risk Factors – Risks Relating to our Business—Adverse economic or political conditions in the countries where we operate or sell our products and services may decrease our sales or disrupt our manufacturing operations, thereby adversely affecting our revenues, profitability and financial condition”; and note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Europe

Sales to customers in Europe accounted for 11% of our sales of tubular products and services in 2010, compared to 12% in 2009 and 17% in 2008.

Our single largest country market in Europe is Italy. The market for steel pipes in Italy (as in most of the EU) is affected by general industrial production trends, especially in the mechanical and automotive industry, and by investment in power generation, petrochemical and oil refining facilities. Our customers in Europe include, in addition to end users and distributors serving the mechanical and automotive industries, large engineering companies active in designing and constructing oil and gas processing facilities worldwide. Sales to the mechanical and automotive industries were particularly affected during the second half of 2008 and throughout 2009, by the financial and economic crisis, as these industries adjusted activity levels drastically in response to uncertain demand conditions. Sales recovered during 2010.

The European market also includes the North Sea region and other areas, such as Romania, where oil and gas drilling takes place. Demand from these markets is affected by oil and gas prices in the international markets and their consequent impact on oil and gas drilling activities in these areas. Following a strong level of sales in 2008, in the past two years, our sales of OCTG products in the North Sea region and Romania, have decreased in large part due to inventory adjustment activity.

Middle East and Africa

Sales to customers in the Middle East and Africa accounted for 19% of our sales of tubular products and services in 2010, compared to 24% in 2009 and 18% in 2008.

Our sales in the Middle East and Africa are sensitive to international prices of oil and gas and their impact on drilling activities as well as to the production policies pursued by OPEC, many of whose members are located in this region. In 2010, drilling activity has increased in the region, following a slight dip in 2009. Oil and gas producing countries, led by Saudi Arabia, slowed down their investments in developing additional oil production capacity but have increased investments to develop gas reserves to fuel regional gas-based industrial development, which have positively affected their consumption of premium OCTG products. In addition, there has been a significant increase in drilling activity in Iraq as that country seeks to reactivate its oil and gas industry. In Africa, international oil companies have been increasing investments in exploration and production in offshore projects and seeking new opportunities in less explored Sub Saharan countries.

Our sales in the Middle East and Africa could be adversely affected by political and other events in the region, such as armed conflict, terrorist attacks and social unrest, that could materially impact the operations of companies active in the region’s oil and gas industry. Our sales in that region can also be affected by the levels of inventories held by the principal national oil companies in the region and their effect on purchasing requirements.

In the past few months, political uprisings have affected oil and gas activity in the region and oil exports from Libya have been halted, and accordingly, our sales in Libya and Yemen have been adversely affected. On the other hand and in response to these events, Saudi Arabia is bringing forward its plans to invest in developing additional oil production capacity.

Far East and Oceania

Sales to customers in the Far East and Oceania accounted for 7% of our sales of tubular products and services in 2010, 2009 and 2008.

Our largest markets in the Far East and Oceania are China, Japan and Indonesia. Our sales in China are concentrated on premium OCTG products used in oil and gas drilling activities. Although apparent consumption of pipes in China has increased significantly during the past three years, this increase has been met by higher sales of pipes produced by local producers, who have been increasing their production capacity while imports of high-value pipe products not manufactured by local producers have declined.

In Japan, our subsidiary, NKKTubes, competes against other domestic producers. The market for steel pipe products in Japan is mostly industrial and depends on general factors affecting domestic investment, including production activity. Apparent demand declined significantly since the middle of 2008, due to the decrease in industrial activity and the high level of inventories in the local distributors’ network, but in 2010 began to recover.

We continue to consolidate our regional presence in Indonesia through our recently acquired heat treatment and premium threading facilities. Sales to Indonesia and other markets in the Far East and Oceania are affected by the level of oil and gas drilling activity in these countries and engineering activity particularly related to investment in petrochemical plants and oil refineries.

Projects

We are a leading regional supplier of welded pipes for gas pipeline construction, including offshore pipelines, in South America, where we have manufacturing facilities in Brazil and Argentina. We also supply welded steel pipes to regional mineral slurry pipeline projects for the mining industry and to selected gas pipeline construction projects worldwide. Demand and shipments for our welded steel pipes in this business segment is principally affected by investment in gas pipeline projects in Brazil, Argentina and the rest of South America. These investments can vary significantly from year to year and can be affected by political and financial conditions in the region. Our sales of pipes for pipeline projects were weak in 2010 as the level of sales to line pipe projects was very low.

Others

Our other products and services include sucker rods used in oil extraction activities, welded steel pipes for electric conduits, industrial equipment of various specifications and for diverse applications, including liquid and gas storage equipment and sales of raw materials that exceed our internal requirements. Net sales of other products and services increased 23% in 2010, compared to 2009, mainly due to higher sales of sucker rods, welded pipes for electric conduits in the United States as well as industrial equipment in Brazil.

Competition

The global market for steel pipe products is highly competitive. Seamless steel pipe products, which are used extensively in the oil and gas industry particularly for high pressure, high stress and other complex applications, are produced in specialized mills using round steel billets and specially produced ingots. Welded steel pipe products are produced in mills which process steel coils and plates into steel pipes. Steel companies that manufacture steel coils and other steel products but do not operate specialized seamless steel mills are generally not competitors in the market for seamless steel pipe products, although they often produce welded steel pipes or sell steel coils and plates used to produce welded steel pipe.

The production of steel pipe products following the stringent requirements of major oil and gas companies requires the development of specialized skills and significant investments in manufacturing facilities. By contrast, steel pipe products for standard applications can be produced in most seamless pipe mills worldwide and sometimes compete with welded pipe products for such applications including OCTG applications. Welded pipe, however, is not generally considered a satisfactory substitute for seamless steel pipe in high-pressure or high-stress applications.

In recent years, substantial investments have been made, especially in China, to increase production capacity of seamless steel pipe products. New production capacity continues to be installed and there is significant excess production capacity, particularly for “commodity” or standard product grades. Capacity for the production of more specialized product grades is also increasing. The competitive environment, therefore, is expected to be more intense in the next five years than it has been in the previous five years and effective competitive differentiation will be a key success factor for Tenaris.

Our principal competitors in steel pipe markets worldwide are described below.

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Sumitomo Metal Industries Ltd. and JFE (the seamless pipe business of the former Kawasaki Steel) in the aggregate enjoy a significant share of the international market, having established strong positions in markets in the Far East and the Middle East. They are internationally recognized for the high quality of their products and for their supply of high-alloy grade pipe products. On September 27, 2002, Kawasaki Steel and NKK, our partner in NKKTubes, consummated a business combination and merger, through which they became subsidiaries of JFE. JFE continues to operate the former Kawasaki Steel’s seamless steel pipe business in competition with NKKTubes. Recently, Sumitomo Metal Industries Ltd. and Nippon Steel Corp, which has a small seamless pipe operation largely serving the Japanese domestic market and is a large producer of large diamater welded pipe products, announced their intention to merge by 2012.

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Vallourec, a Franco-German venture, has mills in Brazil, France, Germany and the United States. Vallourec has a strong presence in the European market for seamless pipes for industrial use and a significant market share in the international market with customers primarily in Europe, the United States, Brazil, and Africa. Vallourec is an important competitor in the international OCTG market, particularly for high-value premium joint products, where it operates a technology partnership with Sumitomo. In 2008, Vallourec acquired three U.S. tubular businesses from Grant Prideco: Atlas Bradford^® Premium Threading & Services, TCA^® and Tube-Alloy. In addition, jointly with Sumitomo, Vallourec is constructing an integrated seamless pipe mill in Brazil which will be primarily dedicated to OCTG production and is scheduled to start sales towards the end of 2011. Vallourec has also started construction of a new seamless pipe rolling mill in the U.S. at its existing facility in Youngstown, Ohio, and expects to begin the commercial production during 2012. It has also recently concluded an agreement with a Chinese seamless steel producer under which it would distribute products from the Chinese producer in markets outside China.

•

In recent years, TMK, a Russian company, has led consolidation of the Russian steel pipe industry, invested to modernize and expand its production capacity in Russia and has expanded internationally through acquisitions into Eastern Europe and the United States where it acquired IPSCO’s tubular operations comprising both seamless and welded pipe mills and thereby a significant position in the U.S. market.

•

Also in recent years, Chinese producers have increased production capacity substantially and strongly increased their exports of steel pipe products, particularly to the United States, the European Union and Canada before anti-dumping restrictions were placed on Chinese imports to those regions. The largest Chinese producer of seamless steel pipes, TPCO, announced in 2009 its intention to build a new seamless pipe facility in the United States. Although producers from China compete primarily in the “commodity” sector of the market, some of these producers including TPCO, have been upgrading their facilities and processes with the intention of entering into the market for more specialized products.

•

The tubes and pipes business in the United States and Canada has experienced a significant consolidation process. Following the acquisitions of Maverick and Hydril by Tenaris, US Steel Corporation acquired Lone Star Steel Technologies. In 2008, Evraz Group S.A. and TMK, two Russian companies, acquired IPSCO’s Tubular division which has both seamless and welded mills in the United States and Canada. Evraz retained IPSCO’s operations in Canada while TMK acquired IPSCO’s operations in the United States, as mentioned above. North American pipe producers are largely focused on supplying the U.S. and Canadian markets, where they have their production facilities.

•

Tubos Reunidos S.A. of Spain and Voest Alpine AG of Austria each have a significant presence in the European market for seamless steel pipes for industrial applications, while the latter also has a relevant presence in the international OCTG market. ArcelorMittal has created a tubes division. In 2006, through the acquisition of Arcelor, Mittal acquired Dofasco’s tubular business, focused on the automotive segment in North America and in 2007 acquired a tubular business focused on automotive products from Vallourec. Previously, Mittal had acquired a tubular business in Romania. In 2008, ArcelorMittal acquired Unicon, a Venezuelan welded pipe producer focused on the oil and gas sector. ArcelorMittal is also building a seamless pipe mill in Saudi Arabia.

Producers of steel pipe products can maintain strong competitive positions in markets where they have their pipe manufacturing facilities due to logistical and other advantages that permit them to offer value-added services and maintain strong relationships with domestic customers, particularly in the oil and gas sectors. Our subsidiaries have established strong ties with major consumers of steel pipe products in their home markets, reinforced by JIT arrangements, as discussed above.

Capital Expenditure Program

During 2010, our capital expenditures, including investments at our plants and investments in information systems, amounted to $847.3 million, compared to $460.9 million in 2009 and $443.2 million in 2008. Of these capital expenditures, investment at our plants amounted to $819.8 million in 2010, compared to $440.5 million in 2009 and $412.0 million in 2008. In 2010, we focused our investments on increasing capacity at our seamless pipe facility in Mexico, as well as on repositioning our industrial system to extend the range of products, improve productivity and environmental performance. The major highlights of our capital spending program during 2010 include:

•

construction of the hot area of the new small diameter rolling mill and erection of the new training building at our Veracruz facility in Mexico. The new plant, with a production capacity of 450,000 tons per year, required an investment of approximately $850 million over two years. For more information, see Item 4.B. “Information on the Company – Business Overview – Production Facilities – Tubes – North America – Mexico”;

•

revamping of the rotary furnace and hot rolling mills allowing bigger pipes production; and a new Dopeless^® coating installation at our Dalmine facility in Italy;

•

completion of the new tubing line and quality facilities at our welded pipe facilities in the United States;

•

completion of the new premium-joint threading facility in Saudi Arabia;

•

capacity expansion on the current Dopeless^® application line at our Campana facility in Argentina; and

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increase of premium joint threading capacity and the installation of a thread connectors welding plant at our Projects facility in Brazil.

In 2011, in addition to the completion of our investment in Mexico, our investments will mainly aim at enhancing product differentiation, investing in local finishing capabilities, improving quality and process controls, enhancing plant’s safety, minimizing environmental impact, reducing costs and extending our product range. Major projects planned for 2011 include:

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completion of a new premium-joint threading line, heat treatment and finishing lines at our new small diameter rolling mill at the Veracruz facility in Mexico;

•

revamping of the electric arc furnace, a new sucker rods plant and the relocation and expansion of the accessories plant in Mexico;

•

additional heat treatment and finishing capacity at our welded pipe facilities in the United States;

•

revamping of the finishing facilities and completion of the hot rolling mills’s works at our Dalmine facility in Italy;

•

revamping of the hot rolling mills and finishing lines at our Silcotub facility in Romania, in order to extend the product range;

•

expansion of premium threading capacity worldwide, including new Dopeless^® lines; and

•

new R&D center in Rio de Janeiro, Brazil.

In addition to capital expenditures at our plants, we have invested in information systems for the integration of our production, commercial and managerial activities. These investments are intended to promote the further integration of our operating facilities and enhance our ability to provide value-added services to customers worldwide. Investments in information systems totaled $27.2 million in 2010, compared to $20.4 million in 2009, and $27.0 million in 2008.

Raw Materials and Energy

The majority of our seamless steel pipe products are manufactured in integrated steel making operations using the electric arc furnace route, with the principal raw materials being steel scrap, DRI, HBI, pig iron and ferroalloys. In Argentina, we produce our own DRI from iron ore using natural gas as a reductant. Our integrated steel making operations consume significant quantities of electric energy, a significant portion of which we generate in our own facilities. Our welded steel pipe products are processed from purchased steel coils and plates.

Steel scrap, pig iron and HBI

Steel scrap, pig iron and HBI for our steelmaking operations are sourced from local, regional and international sources. In Argentina, we produce our own DRI and source ferrous scrap domestically through a 75% owned scrap collecting and processing subsidiary. In Italy, we purchase pig iron and ferrous scrap from local and regional markets. In Mexico, we import our pig iron and HBI

requirements and purchase scrap from domestic and international markets. In Romania, we source ferrous scrap from the domestic market.

International prices for steel scrap, pig iron and HBI can vary substantially in accordance with supply and demand conditions in the international steel industry. Our costs for these materials decreased in 2009, however, have increased in 2010, as demand strengthens on the back of the Western economies recovery.

Ferroalloys

At each of our steel shops we coordinate our purchases of ferroalloys worldwide. The international costs of ferroalloys can vary substantially. Our costs of ferroalloys increased in 2010, in line with international prices for these materials, experiencing high levels of volatility for certain materials.

Iron ore

We consume iron ore, in the form of pellets and lump ore, for the production of DRI in Argentina. Our annual consumption of iron ore in Argentina ranges between 1,000,000 and 1,500,000 tons and is supplied from Brazil primarily by Companhia Vale do Rio Doce and Samarco Mineração S.A. During 2010 prices have risen on the back of a strong Chinese demand and supply disruptions in the spot market, due to Indian constrains. In addition, major steelmakers have accepted quarterly pricing of iron ore based on spot prices, putting an end to 40 years of annual contract pricing.

Round steel bars

We purchase round steel bars and ingots for use in our seamless steel pipe facilities in Japan and Canada.

In Japan, we purchase these materials from JFE, our partner in NKKTubes. These purchases are made under a supply arrangement pursuant to which the purchase price varies in relation to changes in the cost of production. As a result of their location within a larger production complex operated by the supplier, our operations in Japan are substantially dependent on these contracts for the supply of raw materials and energy. JFE uses imported iron ore, coal and ferroalloys as principal raw materials for producing steel bars at Keihin.

In Canada, we have a long-term agreement with Rio Tinto Fer et Titane, a Canadian producer of titanium dioxide and high purity iron, under which Rio Tinto Fer et Titane supplies up to 100,000 tons of round steel bars per year, at U.S. dollar prices adjusted in accordance with variations in raw material costs. We use steel bars produced in our integrated facilities in Argentina, Mexico and Romania for the remainder of our round steel bar requirements.

Steel coils and plates

For the production of welded steel pipe products, we purchase steel coils and steel plates principally from domestic producers for processing into welded steel pipes. We have welded pipe operations in Argentina, Brazil, Canada, Colombia and the United States. Steel coil market prices fluctuated during 2010, increasing in the first half of the year and decreasing in the second half, to finish the year at price levels similar to those at the begining. However, in the year to date, steel prices have risen strongly.

For our welded pipe operations in the United States, a significant part of our requirements for steel coils are supplied under long-term contracts with prices referenced to market levels. Our principal supplier in the United States is Nucor Steel, which has a steel coil manufacturing facilities in Hickman, Arkansas, near to our principal welded pipe facility in the United States. To secure a supply of steel coils for our Hickman facility, we entered into a five year purchase contract with Nucor under which we have committed to purchase around 435,000 tons of steel coils per year with prices adjusted monthly in accordance with market conditions starting in January 2007. This contract, which would expire in December 2011, has been extended through December 2012, and although prices are adjusted monthly in accordance with market conditions, the latest price negotiation covers from January 2011 to December 2011.

In Canada, we have agreements with our main steel suppliers for our welded pipe operations with prices referenced to market levels (i.e., CRU). These main suppliers are: ArcelorMittal Dofasco, which has steel coil manufacturing facilities in Hamilton, Ontario, Canada, and Essar Steel Algoma, which has steel coil manufacturing facilities in Sault Ste. Marie, Ontario, Canada.

We also purchase steel coils and plates for our welded pipe operations in South America (Colombia, Brazil and Argentina) principally from Usiminas and ArcelorMittal in Brazil, from Siderar S.A.I.C., or Siderar, a subsidiary of Ternium S.A. in Argentina and from Ternium’s facilities in Mexico.

Energy

We consume substantial quantities of electric energy at our electric steel shops in Argentina, Italy, Mexico and Romania. In Argentina, we have a 160 megawatt power generation plant located at San Nicolás, approximately 150 kilometers from Campana, which together with a smaller thermo-electric power generating plant located within the Campana facility, is sufficient to supply the requirements of our steelmaking facility at Campana. In Italy, we have a120 megawatt power generation facility, which is designed to meet the electric power requirements of our steelmaking facility at Dalmine. In Mexico, our electric power requirements are furnished by the Mexican government-owned Comisión Federal de Electricidad, or the Federal Electric Power Commission, and in Romania, we source power from the local market.

We consume substantial volumes of natural gas in Argentina, particularly in the generation of DRI and to operate our power generation facilities. Panamerican Energy and YPF S.A., or YPF, are our principal suppliers of natural gas in Argentina. The balance of our natural gas requirements is supplied by several companies, including Tecpetrol S.A., or Tecpetrol, a subsidiary of San Faustin, which supplies us under market conditions and according to local regulations.

We have transportation capacity agreements with Transportadora de Gas del Norte S.A., or TGN, a company in which San Faustin holds significant but non-controlling interests, corresponding to capacity of 1,000,000 cubic meters per day until April 2017. When the enlargement of the trunk pipelines in Argentina is completed, we expect to obtain additional gas transportation capacity of 315,000 cubic meters per day until 2027. In order to meet our transportation requirements for natural gas above volumes contracted with TGN, we also have agreements with Gas Natural Ban S.A., or Gasban, for interruptible transportation capacity currently corresponding to approximately 970,000 cubic meters per day. The 315,000 cubic meters per day of assigned non-interruptible transportation capacity from TGN is expected to partially replace the capacity currently contracted with Gasban. During winter, if available, we also contract transportation capacity from other suppliers, when Gasban transportation is restricted. For the final transportation phase, we have a supply contract with Gasban that expires in April 2012.

In addition to the normal amount of gas consumed at our Italian plants, we also consume substantial quantities of natural gas in connection with the operation of our power generation facility in Italy. Our natural gas requirements in Italy are supplied by various suppliers.

Our costs for electric energy and natural gas vary from country to country. After a decrease in energy costs during 2009, energy costs increased again during 2010. Over the course of the last several years, demand for electricity in Argentina has increased substantially, resulting in shortages of electricity to residential and industrial users during periods of high demand. Similarly, the cost of natural gas for industrial use in Argentina increased significantly during the last three years driven by increased local demand and by governmental policies that subsidized certain residential consumption of natural gas. The demand for natural gas continues to outpace supply, therefore supply to industrial users has often been restricted during the Argentine winter. See Item 3.D. “Key Information – Risk Factors – Risks Relating to our Industry – Increases in the cost of raw materials, energy and other costs, limitations or disruptions to the supply of raw materials and energy; and price mismatches between raw materials and our products may hurt our profitability” and Item 3.D. “Key Information – Risk Factors – Risks Relating to our Business – Adverse economic or political conditions in the countries where we operate or sell our products and services may decrease our sales or disrupt our manufacturing operations, thereby adversely affecting our revenues, profitability and financial condition”.

Product Quality Standards

Our steel pipes are manufactured in accordance with the specifications of the American Petroleum Institute, or API, the American Society for Testing and Materials, or ASTM, the International Standardization Organization, or ISO, and the Japan Industrial Standards, or JIS. The products must also satisfy our proprietary standards as well as our customers’ requirements. We maintain an extensive quality assurance and control program to ensure that our products continue to satisfy proprietary and industry standards and are competitive from a product quality standpoint with products offered by our competitors.

We currently maintain, for all our pipe manufacturing facilities, the Quality Management System Certification ISO 9001:2008 granted by Lloyd Register Quality Assurance-Italy, and the API Q1 Quality Certification granted by API-U.S., which are requirements for selling to the major oil and gas companies, which have rigorous quality standards. Our quality management system, based on the ISO 9001 and API Q1 specifications assures that products comply with customer requirements from the acquisition of raw materials to the delivery of the final product, and are designed to ensure the reliability and improvement of both the product and the processes associated with the manufacturing operations.

All our mills involved in the manufacturing of material for the automotive market are certified according to the standard ISO/TS 16949 by Lloyd Register Quality Assurance-UK.

Research and Development

Research and development, or R&D, of new products and processes to meet the increasingly stringent requirements of our customers is an important aspect of our business.

R&D activities are carried out primarily at our specialized research facilities located at our Campana plant in Argentina, at our Veracruz plant in Mexico, at our Dalmine plant in Italy, at the product testing facilities of NKKTubes in Japan and at the research facilities of the Centro Sviluppo Materiali S.p.A, or CSM, in Rome. We have an 8% interest in CSM, which was acquired in 1997. Product development and research currently being undertaken are focused on the increasingly challenging energy markets and include:

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proprietary premium joint products including Dopeless^® technology;

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heavy wall deep water line pipe and risers;

•

proprietary steels;

•

tubes and components for the car industry and mechanical applications;

•

tubes for boilers; and

•

welded pipes for oil and gas and other applications.

In addition to R&D aimed at new or improved products, we continuously study opportunities to optimize our manufacturing processes. Recent projects in this area include modeling of rolling and finishing process and the development of different process controls, with the goal of improving product quality and productivity at our facilities.

We spent $61.8 million for R&D in 2010, compared to $62.7 million in 2009 and $77.3 million in 2008.

Environmental Regulation

protecting the environment have become increasingly complex and more stringent and expensive to implement in recent years. International environmental requirements vary.

The ultimate impact of complying with existing laws and regulations is not always clearly known or determinable since regulations under some of these laws have not yet been promulgated or are undergoing revision. The expenditures necessary to remain in compliance with these laws and regulations, including site or other remediation costs, or costs incurred from potential environmental liabilities, could have a material adverse effect on our financial condition and profitability. While we incur and will continue to incur expenditures to comply with applicable laws and regulations, there always remains a risk that environmental incidents or accidents may occur that may negatively affect our reputation or our operations.

Compliance with applicable environmental laws and regulations is a significant factor in our business. We have not been subject to any material penalty for any material environmental violation in the last five years, and we are not aware of any current material legal or administrative proceedings pending against us with respect to environmental matters which could have an adverse material impact on our financial condition or results of operations.

Insurance

We carry property damage, general liability (including employer’s, third-party and product liability) and certain other insurance coverage in line with industry practice. Our current general liability coverage includes third party, employers, sudden and accidental seepage and pollution and product liability, up to a limit of $250 million. Our current property insurance program has indemnification caps up to $250 million for direct damage, depending on the value of the different plants. In some cases, insurers have the option to replace damaged or destroyed plant and equipment rather than to pay us the insured amount.

C. Organizational Structure and Subsidiaries

We conduct all our operations through subsidiaries. The following table shows the major operating subsidiaries of the Company and its direct and indirect ownership in each subsidiary as of December 31, 2010, 2009 and 2008.


			Percentage Ownership
Company	Country of Organization	Main Activity	2010			2009			2008
Algoma Tubes Inc.	Canada	Manufacture of seamless steel pipes		100	%		100	%		100	%
Confab Industrial S.A. ^(a)	Brazil	Manufacture of welded steel pipes and capital goods		41	%		40	%		40	%
Dalmine S.p.A	Italy	Manufacture of seamless steel pipes		99	%		99	%		99	%
Hydril Company	U.S.A.	Manufacture and marketing of premium connections		100	%		100	%		100	%
Maverick Tube Corporation	U.S.A.	Manufacture of welded steel pipes		100	%		100	%		100	%
NKKTubes K.K.	Japan	Manufacture of seamless steel pipes		51	%		51	%		51	%
Prudential Steel ULC	Canada	Manufacture of welded steel pipes		100	%		100	%		100	%
S.C. Silcotub S.A.	Romania	Manufacture of seamless steel pipes		100	%		100	%		100	%
Siat S.A.	Argentina	Manufacture of welded steel pipes		82	%		82	%		82	%
Siderca S.A.I.C.	Argentina	Manufacture of seamless steel pipes		100	%		100	%		100	%
Tavsa, Tubos de Acero de Venezuela S.A.^(b)	Venezuela	Manufacture of seamless steel pipes		—			—			70	%
Tenaris Coiled Tubes LLC (and predecessors)	U.S.A.	Manufacture of coiled tubing		100	%		100	%		100	%
Tenaris Financial Services S.A.	Uruguay	Financial services		100	%		100	%		100	%
Tenaris Global Services S.A.	Uruguay	Holding company and marketing of steel pipes		100	%		100	%		100	%
Tenaris Investments Ltd.	Ireland	Holding company and financial services		100	%		100	%		100	%
Tubos de Acero de México S.A.	Mexico	Manufacture of seamless steel pipes		100	%		100	%		100	%
Tubos del Caribe Ltda.	Colombia	Manufacture of welded steel pipes		100	%		100	%		100	%

(a)	Tenaris holds 99% of the voting shares of Confab Industrial S.A.

(b)	In 2009, the Venezuelan government announced the nationalization of Tavsa. For more information on the Tavsa nationalization process, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Other Investments

Ternium

We have a significant investment in Ternium, one of the leading steel producers of the Americas with production facilities in Argentina and Mexico. Ternium is a company that was formed by San Faustin in a reorganization of its flat and long steel interests. Ternium’s securities are listed on the New York Stock Exchange, or NYSE, since February 1, 2006, following an initial public offering of ADSs. As of May 31, 2011, the Company held 11.46% of Ternium’s share capital (including treasury shares).

We acquired our investment in Ternium through the exchange of our prior indirect investments in Sidor for an interest in Ternium.

The Company is a party to a shareholders’ agreement with Techint Holdings S.àr.l., or Techint Holdings, (formerly known as I.I.I. Industrial Investments Inc.), a wholly owned subsidiary of San Faustin, pursuant to which Techint Holdings will take all actions in its power to cause one of the members of Ternium’s board of directors to be nominated by the Company and any directors nominated by the Company only be removed pursuant to written instructions by the Company. The Company and Techint Holdings also agreed to cause any vacancies on Ternium’s board of directors to be filled with new directors nominated by either the Company or Techint Holdings, as applicable. The shareholders’ agreement will remain in effect as long as each of the parties holds at least 5% of the shares of Ternium or until it is terminated by either the Company or Techint Holdings pursuant to its terms. Carlos Condorelli, our former chief financial officer, was nominated as a director of Ternium pursuant to this agreement.

Exiros

Exiros, with offices located in various countries, and in which we have a 50% share ownership and Ternium has the remaining 50% share ownership, provides our subsidiaries with purchase agency services in connection with our purchases of raw materials and other products or services. Exiros’s objectives are to procure better purchase conditions and prices by exercising the improved bargaining power that results from combining the demand of products and services by both Ternium and Tenaris.

D. Property, Plants and Equipment

For a description of our property, plants and equipment, please see Item 4. B. “Information on the Company – Business Overview – Production Process and Facilities” and Item 4.B. “Information on the Company – Business Overview – Capital Expenditure Program”.

Item 4A.

Unresolved Staff Comments.

None.

Item 5.

Operating and Financial Review and Prospects

The following discussion and analysis of our financial condition and results of operations are based on, and should be read in conjunction with, our audited consolidated financial statements and the related notes included elsewhere in this annual report. This discussion and analysis presents our financial condition and results of operations on a consolidated basis. We prepare our consolidated financial statements in conformity with IFRS. IFRS differ in certain significant respects from U.S. GAAP.

Certain information contained in this discussion and analysis and presented elsewhere in this annual report, including information with respect to our plans and strategy for our business, includes forward-looking statements that involve risks and uncertainties. See “Cautionary Statement Concerning Forward-Looking Statements”. In evaluating this discussion and analysis, you should specifically consider the various risk factors identified in Item 3.D. “Key Information – Risk Factors”, other risk factors identified elsewhere in this annual report and other factors that could cause results to differ materially from those expressed in such forward-looking statements.

Overview

We are a leading global manufacturer and supplier of steel pipe products and related services for the energy industry and other industries.

We are a leading global manufacturer and supplier of steel pipe products and related services for the world’s energy industry as well as for other industrial applications. Our customers include most of the world’s leading oil and gas companies as well as engineering companies engaged in constructing oil and gas gathering and processing and power facilities. Over the last two decades, we have expanded our business globally through a series of strategic investments, and we now operate an integrated worldwide network of steel pipe manufacturing, research, finishing and service facilities with industrial operations in the Americas, Europe, Asia and Africa and a direct presence in most major oil and gas markets.

Our main source of revenue is the sale of products and services to the oil and gas industry, and the level of such sales is sensitive to international oil and gas prices and their impact on drilling activities.

Demand for our products and services from the global oil and gas industry, particularly for tubular products and services used in drilling operations, represents a substantial majority of our total sales. Our sales, therefore, depend on the condition of the oil and gas industry and our customers’ willingness to invest capital in oil and gas exploration and development as well as in associated downstream processing activities. The level of these expenditures is sensitive to oil and gas prices as well as the oil and gas industry’s view of such prices in the future.

A growing proportion of exploration and production spending by oil and gas companies has been directed at offshore, deep drilling and non-conventional drilling operations in which high-value tubular products, including special steel grades and premium connections, are usually specified. Technological advances in drilling techniques and materials are opening up new areas for exploration and development. More complex drilling conditions are expected to continue to demand new and high value products and services in most areas of the world.

In 2010, global drilling activity recovered led by substantially higher oil drilling activity in the United States and Canada. U.S. gas drilling activity also increased driven by investments in shale and liquid rich plays and production from shale gas reached 23% of total U.S. natural gas production in 2010. In the rest of the world, activity increased in most markets reflecting increased demand for energy, stable oil prices at attractive levels and investment in regional gas developments. The international rig count, as published by Baker Hughes, surpassed pre-crisis levels in the third quarter and has continued to climb steadily since then.

We expect that drilling activity will continue to grow in 2011 led by increased exploration activity in Eastern Hemisphere markets, more thermal wells in Canada and higher activity in Iraq.

We estimate that apparent demand for OCTG rose 30% in 2010 compared to 2009 with the most significant increases occurring in the United States, Canada and Russia. In 2011, we expect that demand will grow further with increases occurring in most markets. We also expect that growth in demand for premium products will be higher than that for API products.

We expect that our sales will grow in all our geographical regions in 2011 and that our sales of OCTG, line pipe, power generation and industrial products will increase. Sales in our Projects and Others operating segments are also expected to increase. Although our selling prices are expected to rise, these increases are likely to be initially offset by increases in raw material and other costs. Accordingly, we expect that our sales and operating income will increase in 2011, compared to 2010.

Our business is highly competitive.

The global market for steel pipes is highly competitive, with the primary competitive factors being price, quality, service and technology. We sell our products in a large number of countries worldwide and compete primarily against European and Japanese producers in most markets outside North America. In the United States and Canada we compete against a wide range of local and foreign producers. Competition in markets worldwide has been increasing, particularly for products used in standard applications, as producers in countries like China and Russia increase production capacity and enter export markets.

Our production costs are sensitive to prices of steelmaking raw materials and other steel products.

We purchase substantial quantities of steelmaking raw materials, including ferrous steel scrap, direct reduced iron (DRI), pig iron, iron ore and ferroalloys, for use in our production of our seamless pipe products. In addition, we purchase substantial quantities of steel coils and plate for use in the production of our welded pipe products. Our production costs, therefore, are sensitive to prices of steelmaking raw materials and certain steel products, which reflect supply and demand factors in the global steel industry and in the countries where we have our manufacturing facilities.

The costs of steelmaking raw materials and of steel coils and plates have increased in 2010, more steeply towards the end of the year and beginning of 2011.

Critical Accounting Estimates

This discussion and analysis of our financial condition and results of operations are based on our audited consolidated financial statements, which have been prepared in accordance with IFRS. IFRS differ in certain significant respects from U.S. GAAP.

The preparation of these audited consolidated financial statements and related disclosures in conformity with IFRS requires us to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities and the reported amounts of revenue and expenses. Management evaluates its accounting estimates and assumptions, including those related to: impairment of long-lived tangible and intangible assets; assets useful lives; obsolescence of inventory; doubtful accounts and loss contingencies, and revises them when appropriate. Management bases its estimates on historical experience and on various other assumptions it believes to be reasonable under the circumstances. These estimates form the basis for making judgments about the carrying values of assets and liabilities that are not readily apparent from other sources. Although management believes that these estimates and assumptions are reasonable, they are based upon information available at the time they are made. Actual results may differ significantly from these estimates under different assumptions or conditions.

Our most critical accounting estimates are those that are most important to the portrayal of our financial condition and results of operations, and which require us to make our most difficult and subjective judgments, often as a result of the need to make estimates of matters that are inherently uncertain. Our most critical accounting estimates and judgments are the following:

Accounting for business combinations

To account for our business combinations we use the purchase method, which requires the acquired assets and assumed liabilities to be recorded at their respective fair value as of the acquisition date. The determination of fair values of assets acquired, liabilities and contingent liabilities assumed, requires us to make estimates and use valuation techniques, including the use of independent valuators, when market value is not readily available. The excess of the acquisition cost over the fair value of the identifiable net assets acquired is allocated to goodwill.

Impairment and recoverability of goodwill and other assets

Long-lived assets including identifiable intangible assets are reviewed for impairment at the lowest level for which there are separately identifiable cash flows (cash generating units, or CGU). Most of the Tenaris’s principal subsidiaries that constitute a CGU have a single main production facility and, accordingly, each such subsidiary represents the lowest level of asset aggregation that generates largely independent cash inflows.

In assessing whether there is any indication that a CGU may be impaired, external and internal sources of information are analyzed. Material facts and circumstances specifically considered in the analysis usually include the discount rate used in Tenaris’s cash flow projections and the business condition in terms of competitive and economic factors, such as the cost of raw materials, oil and gas prices, competitive environment, capital expenditure programs for Tenaris’s customers and the evolution of the rig count.

An impairment loss is recognized for the amount by which the asset’s carrying amount exceeds its recoverable amount. The recoverable amount is the higher of the asset’s value in use and fair value less costs to sell. Any impairment loss is allocated to reduce the carrying amount of the assets of the CGU in the following order:

(a) first, to reduce the carrying amount of any goodwill allocated to the CGU; and

(b) then, to the other assets of the unit (group of units) pro rata on the basis of the carrying amount of each asset in the unit (group of units), considering not to reduce the carrying amount of the asset below the highest of its fair value less cost to sell, its value in use or zero.

The value in use of each CGU is determined on the basis of the present value of net future cash flows which would be generated by such CGU. Tenaris uses cash flow projections for a five year period with a terminal value calculated based on perpetuity and appropriate discount rates.

For purposes of calculating the fair value less costs to sell Tenaris uses the estimated value of future cash flows that a market participant could generate from the corresponding CGU. Tenaris uses cash flow projections for a five year period with a terminal value calculated based on perpetuity and appropriate discount rates.

Management judgment is required to estimate discounted future cash flows. Actual cash flows and values could vary significantly from the forecasted future cash flows and related values derived using discounting techniques.

Non-financial assets other than goodwill that suffered an impairment are reviewed for possible impairment-reversal at each reporting date.

In 2010, Tenaris reversed the impairment registered in 2008 corresponding to Prudential CGU’s Customer Relationships.

In 2010 and 2009, none of Tenaris’s CGUs including long-lived assets with finite useful lives, were tested for impairment as no impairment indicators were identified. In 2008, Tenaris identified the presence of impairment indicators in certain CGUs and, accordingly, carried out impairment tests.

2010 Impairment reversal

In 2010, Tenaris reversed the impairment registered in 2008 corresponding to Prudential CGU’s Customer Relationships as there has been an improvement in the outlook of the economic and competitive conditions for the Canadian oil and gas market compared to that foreseen at the end of 2008. The main key assumptions that Tenaris considered were the expected oil and natural gas prices evolution and the level of drilling activity in Canada. Tenaris use the average number of active oil and gas drilling rigs, or rig count, as published by Baker Hughes, as a general indicator of activity in the oil and gas sector. The rig count in Canada increased 59% from an annual average of 221 in 2009 to an annual average of 351 in 2010. In this environment, Tenaris expects that its competitive conditions and activity levels will continue to improve.

The recoverable amount of the Prudential (Canada) CGU was estimated based on the value in use. The discount rate used was based on a weighted average cost of capital (WACC) of 10.7%.

Tenaris has increased the carrying amount of the Customer Relationships by $67.3 million to its recoverable amount which in accordance with IAS 36 is the one that would have been determined (net of amortization) had no impairment loss been recognized for the asset in the year 2008. In addition, the Company recognized the respective deferred tax effect of $16.9 million in Income tax in the consolidated income statement.

2008 Impairment charge

In 2008, Tenaris recorded an impairment charge of $502.9 million; of which $394.3 million corresponds to intangible assets originated in the acquisition of Maverick in 2006. This charge impacted the following CGUs: OCTG (USA and Colombia), Coiled Tubing, Prudential (Canada) and Electric Conduits. The pretax rates used in the calculation ranged from 11% to 14% per annum and for the cash flows beyond the fifth year an inflation and growth rate of 2% was considered.

steep reduction in the average number of active oil and drilling rigs, or rig count, in these markets, which are sensitive to North American gas prices and the worldwide financial and economic crisis. In 2008, North American gas prices rose rapidly during the first half of the year, peaking in excess of $12 per million BTU, before falling even more steeply to levels below $4 per million BTU. This collapse in North American gas prices had an immediate effect on the U.S. and Canadian rig counts. The rig count in the United States, which is more sensitive to North American gas prices, increased 6% in 2008, compared to 2007, rising steadily in the first part of the year to peak at 2,031 during the month of September and falling in the fourth quarter to end the year at 1,623 (a 20% decrease over that period); by the end of March 2009, rig count in the United States had fallen to 1,039, an additional 36% decrease. This decrease in drilling activity and the high level of inventories put downward pressure on the tubes price. Accordingly, in December 2008, the Company expected that the decrease in apparent demand of OCTG products in North America would continue, due to the decline in oil and gas drilling activity and its customers’ efforts to reduce inventories.

In the case of the Prudential CGU impairment, the Company allocated the impairment charge to goodwill and before the pro rata allocation, the Company (based on third-party appraisals made in connection with the acquisition of Maverick Tube Corporation in October 2006) determined that the carrying amount of Prudential’s property, plant and equipment approximated its fair value; while the Company considered that the fair value of Prudential’s customer relationships could have suffered a decrease due to the deterioration of the market conditions and the change in the competitive environment. Accordingly, following the guidance in paragraph 105 of IAS 36, the Company allocated the remainder of the impairment charge corresponding to the Prudential CGU ($68.1 million) to customer relationships.

Tenaris’s Venezuelan operations, currently nationalized and consequently disclosed as discontinued operations, also contributed to the 2008 impairment charge. Although during the first half of 2008 most of the business indicators of the Venezuelan subsidiaries were favorable, in the second half of the year the steep decline in the prices of raw materials affected the operations of Matesi, a hot-briquetted iron producer; and the lower investments in drilling activity in Venezuela led to a decline in the projected sales in Tavsa. Also, the operating disruptions at the production facilities of each of Tenaris former subsidiaries, Matesi and Tavsa, precipitated this impairment charge.

At December 31, 2008, the carrying value of the total remaining assets (in thousand of U.S. dollars) of the impaired businesses was:


	Total Assets before impairment		Impairment			Total Assets after impairment (*)
Oil Country Tubular Goods (”)		2,506,332		(192,707	)		2,313,625
Prudential		736,772		(138,466	)		598,306
Coiled Tubing		259,722		(23,732	)		235,990
Electric Conduits		250,106		(39,347	)		210,759

Total U.S. and Canadian Operations		3,752,932		(394,252	)		3,358,680

Venezuelan Operations		266,758		(108,647	)		158,111

Total		4,019,690		(502,899	)		3,516,791

(*)	These amounts include total assets of the operation (e.g. short and long lived assets), including goodwill and other intangible assets at December 31, 2008.

Reassessment of Plant and Equipment Asset Useful Lives

Property, plant and equipment are stated at directly attributable historical acquisition or construction cost less accumulated depreciation and impairment losses, if any. Property, plant and equipment acquired through business combinations are valued initially at fair market value. Depreciation of the cost of the asset (apart from land, which is not depreciated), is done using the straight-line method, to depreciate the cost of the asset to its residual value over its estimated useful life. The depreciation method is reviewed at each year end. Estimating useful lives for depreciation is particularly difficult as the service lives of assets are also impacted by maintenance and changes in technology, and our ability to adapt technological innovation to the existing asset base. In accordance

with IAS No. 16, Property, Plant and Equipment, the depreciation method, the residual value and the useful life of an asset must be reviewed at least at each financial year-end, and, if expectations differ from previous estimates, the change must be treated as a change in an accounting estimate. Management’s re-estimation of asset useful lives performed in accordance with IAS 16 (“Property, plant and equipment”) did not materially affect depreciation expense for 2010. However, if management’s estimates prove incorrect, the carrying value of plant and equipment and its useful lives may be required to be reduced from amounts currently recorded. Any such reductions may materially affect asset values and results of operations.

Inventory Reserves: Allowance for Obsolescence of Supplies and Spare Parts and Slow-Moving Inventory

We write down our inventory for estimated obsolescence or unmarketable inventory equal to the difference between the cost of inventory and the estimated market value taking into consideration assumptions about future demand and market conditions. If actual market conditions are less favorable than those projected by management, additional inventory write-downs may be required.

In relation to finished goods, we make an allowance for slow-moving inventory based on management’s analysis of their ageing and market conditions. For this purpose, stocks of finished goods produced by us or purchased from third parties, more than one year prior to the reporting date, are valued at their estimated recoverable value.

In addition, we estimate the recoverability of inventories of supplies and spare parts, based in part on the following criteria:

•

analysis of the ageing of the supplies and spare parts; and

•

analysis of the potential of materials to be used as intended based on their state of condition and of their potential obsolescence due to technological changes in the mills.

In 2010, due to the recovery in activity and the increase in demand for our pipes, our results were positively affected by a $34 million net recovery in the allowance for inventory obsolescence.

Historically, losses due to obsolescence and scrapping of inventory have been within expectations and the allowances established. If, however, circumstances were to materially change, such as significant changes related to the technology used in the mills, management’s estimates of the recoverability of the value of aged inventories could be materially affected. In this case, our results of operations, financial condition and net worth could be materially and adversely affected.

Allowances for Doubtful Accounts and Customer Claims

Management estimates the ultimate collectibility of accounts receivable. We maintain allowances for doubtful accounts for estimated losses resulting from the inability of our customers to make required payments. If the financial condition of our customers were to deteriorate, negatively impacting their ability to make payments, additional allowances may be required.

Trade account receivables are analyzed on a regular basis and when we become aware of a customer’s inability to meet its financial commitments to us, the value of the receivable is reduced through a charge to an allowance for doubtful accounts. In addition, we also record a charge to the allowance for doubtful accounts upon receipt of customer claims in connection with sales that management estimates are unlikely to be collected in full.

In addition, except for some minor subsidiaries, our allowance for doubtful accounts is adjusted periodically in accordance with the ageing of overdue accounts. For this purpose, trade accounts receivable overdue by more than 180 days, and which are not covered by a credit collateral, guarantee or similar surety, are fully provisioned.

Historically, losses from uncollectible accounts receivables have been within expectations and in line with the allowances established. If, however, circumstances were to materially change, such as higher than expected defaults or an unexpected material adverse change in a major customer’s ability to meet its financial obligation to us, management’s estimates of the recoverability of amounts due could

be materially reduced. In this case, our results of operations, financial condition, net worth and cash flows could be materially and adversely affected.

Loss Contingencies

We are subject to various claims, lawsuits and other legal proceedings, including customer claims, in which a third party is seeking payment for alleged damages, reimbursement for losses or indemnity. Our potential liability with respect to such claims, lawsuits and other legal proceedings cannot be estimated with certainty. Management with the assistance of legal counsel periodically reviews the status of each significant matter and assesses potential financial exposure. If a potential loss from a claim or proceeding is considered probable and the amount can be reasonably estimated, a provision is recorded. Accruals for loss contingencies reflect a reasonable estimate of the losses to be incurred based on information available to management as of the date of preparation of the financial statements, and take into consideration our litigation and settlement strategies. These estimates are primarily constructed with the assistance of legal counsel. However, if management’s estimates prove incorrect, current reserves could be inadequate and we could incur a charge to earnings which could have a material adverse effect on our results of operations, financial condition, net worth and cash flows. As the scope of liabilities becomes better defined, there may be changes in the estimates of future costs which could have a material adverse effect on our results of operations, financial condition, net worth and cash flows.

A.	Results of Operations

The following discussion and analysis of our financial condition and results of operations are based on our audited consolidated financial statements included elsewhere in this annual report. Accordingly, this discussion and analysis present our financial condition and results of operations on a consolidated basis. See “Presentation of Certain Financial and Other Information – Accounting Principles – Tenaris” and Accounting Policies “A. Basis of presentation” and “B. Group accounting” to our audited consolidated financial statements included in this annual report. The following discussion should be read in conjunction with our audited consolidated financial statements and the related notes included in this annual report.


*Thousands of U.S. dollars (except number of shares and per share amounts)*	For the year ended December 31,
	2010			2009			2008
Selected consolidated income statement data⁽¹⁾
Continuing Operations
Net sales		7,711,598			8,149,320			11,987,760
Cost of sales		(4,700,810	)		(4,864,922	)		(6,698,285	)

Gross profit		3,010,788			3,284,398			5,289,475
Selling, general and administrative expenses		(1,515,870	)		(1,473,791	)		(1,787,952	)
Other operating income (expenses), net		78,629			3,000			(375,873	)

Operating income		1,573,547			1,813,607			3,125,650
Interest income		32,855			30,831			48,711
Interest expense		(64,103	)		(118,301	)		(179,885	)
Other financial results		(21,305	)		(64,230	)		(99,850	)

Income before equity in earnings of associated companies and income tax		1,520,994			1,661,907			2,894,626
Equity in earnings of associated companies		70,057			87,041			89,423

Income before income tax		1,591,051			1,748,948			2,984,049
Income tax		(450,004	)		(513,211	)		(1,015,334	)

Income for continuing operations		1,141,047			1,235,737			1,968,715
Discontinued Operations
Result for discontinued operations		—			(28,138	)		306,905

Income for the year ⁽²⁾		1,141,047			1,207,599			2,275,620
Income attributable to ⁽²⁾:
Equity holders of the Company		1,127,367			1,161,555			2,124,802
Non-controlling interests		13,680			46,044			150,818

Income for the year⁽²⁾		1,141,047			1,207,599			2,275,620

Depreciation and amortization		(506,902	)		(504,864	)		(532,934	)
Weighted average number of shares outstanding		1,180,536,830			1,180,536,830			1,180,536,830
Basic and diluted earnings per share for continuing operations		0.95			1.00			1.49
Basic and diluted earnings per share		0.95			0.98			1.80
Dividends per share⁽³⁾		0.34			0.34			0.43

(1)

Certain comparative amounts have been re-presented to conform to changes in presentation in 2009, due to the nationalization of certain Venezuelan subsidiaries. For more information on the nationalization of these Venezuelan subsidiaries, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

(2)

(3)	Dividends per share correspond to the dividends proposed or paid in respect of the year.


*Thousands of U.S. dollars (except number of shares)*	At December 31,
	2010		2009
Selected consolidated financial position data
Current assets		5,955,536		5,621,841
Property, plant and equipment, net		3,780,580		3,254,587
Other non-current assets		4,628,215		4,606,880

Total assets		14,364,331		13,483,308

Current liabilities		2,378,546		1,970,470
Non-current borrowings		220,570		655,181
Deferred tax liabilities		934,226		860,787
Other non-current liabilities		280,409		276,034

Total liabilities		3,813,751		3,762,472
Capital and reserves attributable to the Company’s equity holders		9,902,359		9,092,164
Non-controlling interests		648,221		628,672

Equity		10,550,580		9,720,836

Total liabilities and equity		14,364,331		13,483,308

Share capital		1,180,537		1,180,537
Number of shares outstanding		1,180,536,830		1,180,536,830

The following table sets forth our operating and other costs and expenses as a percentage of net sales for the periods indicated.


*Percentage of net sales*	For the year ended December 31,
	2010			2009			2008
Continuing Operations
Net sales		100.0			100.0			100.0
Cost of sales		(61.0	)		(59.7	)		(55.9	)

Gross profit		39.0			40.3			44.1
Selling, general and administrative expenses		(19.7	)		(18.1	)		(14.9	)
Other operating income (expenses), net		1.0			0.0			(3.1	)

Operating income		20.4			22.3			26.1
Interest income		0.4			0.4			0.4
Interest expense		(0.8	)		(1.5	)		(1.5	)
Other financial results		(0.3	)		(0.8	)		(0.8	)

Income before equity in earnings of associated companies and income tax		19.7			20.4			24.1
Equity in earnings of associated companies		0.9			1.1			0.7

Income before income tax		20.6			21.5			24.9
Income tax		(5.8	)		(6.3	)		(8.5	)

Income for continuing operations		14.8			15.2			16.4

Discontinued Operations
Result for discontinued operations		—			(0.3	)		2.6

Income for the year		14.8			14.8			19.0

Income attributable to:
Equity holders of the Company		14.6			14.3			17.7
Non-controlling interests		0.2			0.6			1.3

Fiscal Year Ended December 31, 2010, Compared to Fiscal Year Ended December 31, 2009

Net Sales, Cost of Sales and Operating Income

The following table shows our net sales by business segment for the periods indicated below:


*Millions of U.S. dollars*	For the year ended December 31,								Increase / (Decrease)
	2010				2009				Increase / (Decrease)
Tubes		6,676.4	87	%		6,670.9	82	%		0	%
Projects		428.8	6	%		986.5	12	%		(57	%)
Others		606.4	8	%		491.8	6	%		23	%

Total		7,711.6	100	%		8,149.3	100	%		(5	%)

The following table indicates our sales volume of seamless and welded pipes by business segment for the periods indicated below:


*Thousands of tons*	For the year ended December 31,				Increase / (Decrease)
	2010		2009		Increase / (Decrease)
Tubes – Seamless		2,206		1,970		12	%
Tubes – Welded		744		346		115	%

Tubes – Total		2,950		2,316		27	%
Projects – Welded		170		334		(49	%)

Total – Tubes + Projects		3,120		2,650		18	%

Tubes

The following table indicates, for our Tubes business segment, net sales by geographic region, cost of sales as a percentage of net sales, operating income and operating income as a percentage of net sales for the periods indicated below:


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2010			2009			Increase / (Decrease)
Net sales
- North America		3,121.7			2,756.1			13	%
- South America		1,110.1			981.9			13	%
- Europe		746.6			828.8			(10	%)
- Middle East & Africa		1,263.6			1,622.6			(22	%)
- Far East & Oceania		434.4			481.5			(10	%)

Total net sales		6,676.4			6,670.9			0	%
Cost of sales (% of sales)		60	%		57	%
Operating income		1,403.3			1,576.8			(11	%)
Operating income (% of sales)		21	%		24	%

Net sales of tubular products and services amounted to $6,676.4 million in 2010, compared to $6,670.9 million in 2009, as a 27% increase in shipment volumes was offset by lower average selling prices (down 21%), as prices fell reflecting a post-crisis competitive environment with excess capacity particularly for standard products. In North America, higher drilling activity in the United States and Canada and a reduction in U.S. OCTG inventory to historic levels by the end of the first quarter of 2010 led to significantly higher shipments partially offset by lower demand in Mexico; prices, however, were at lower levels than in 2009. In South America, higher drilling activity and overall demand in Argentina and Colombia more than offset a decline in pipe prices. In Europe, lower sales prices and lower demand in the North Sea region more than offset higher shipments of mechanical pipe products. In the Middle East and Africa, while shipments of OCTG products remained stable, sales were affected by lower shipments of line pipe products and lower selling prices. In the Far East and Oceania, sales declined due to lower average selling prices.

Cost of sales of tubular products and services, expressed as a percentage of net sales, rose from 57% to 60%, as the reduction in costs of sales did not completely offset the reduction in average selling prices.

Operating income from tubular products and services, decreased 11% to $1,403.3 million (including a $67.3 million gain from the reversal of an 2008 impairment on Prudential’s customer relationships) in 2010, from $1,576.8 million in 2009. This decrease in operating income is primarily attributable to a decrease in gross margin, which more than offset that 27% increase in shipment volumes.

Projects

The following table indicates, for our Projects business segment, net sales, cost of sales as a percentage of net sales, operating income and operating income as a percentage of net sales for the periods indicated below:


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2010			2009			Increase / (Decrease)
Net sales		428.8			986.5			(57	%)
Cost of sales (% of sales)		67	%		71	%
Operating income		63.7			208.6			(69	%)
Operating income (% of sales)		15	%		21	%

Projects net sales, decreased 57% to $428.8 million in 2010, compared to $986.5 million in 2009, reflecting a sharp decrease in shipments to gas and other pipeline projects in South America.

Operating income from Projects, decreased 69% to $63.7 million in 2010, from $208.6 million in 2009, as a result of a decrease in net sales and a lower operating margin due to the effect of fixed and semi-fixed general and administrative expenses on lower sales, including the effect of the revaluation of the Brazilian real against the U.S. dollar.

Others

The following table indicates, for our Others business segment, net sales, cost of sales as a percentage of net sales, operating income and operating income as a percentage of net sales for the periods indicated below:


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2010			2009			Increase / (Decrease)
Net sales		606.4			491.8			23	%
Cost of sales (% of sales)		72	%		79	%
Operating income		106.5			28.1			279	%
Operating income (% of sales)		18	%		6	%

Net sales of other products and services increased 23% to $606.4 million in 2010, compared to $491.8 million in 2009, mainly due to higher sales of sucker rods, welded pipes for electric conduits and industrial equipment.

Operating income from other products and services, increased 279% to $106.5 million in 2010, from $28.1 million in 2009, due to an increase in net sales and an improvement in margins.

Selling, general and administrative expenses, or SG&A, increased as a percentage of net sales to 19.7% in 2010 compared to 18.1% in 2009, mainly due to the effect of foreign exchange currencies on fixed and semi-fixed expenses. In absolute terms SG&A increased $42.1 million to $1,515.9 million in 2010, from $1,473.8 million in 2009, mainly due to higher labor costs as a result of the appreciation of local currencies against the U.S. dollar.

Other operating income and expenses resulted in net income of $78.6 million in 2010, compared to a net income of $3.0 million in 2009. In 2010, we recorded a $67.3 million gain from the reversal of an impairment recorded in 2008, in Prudential’s customer relationships, as our expectations for the economic and competitive conditions of the Canadian oil and gas market improved relative to those foreseen at the end of 2008.

Net interest expenses totaled $31.2 million in 2010, compared to $87.5 million in 2009, reflecting the change in our net debt position to a net cash position and lower interest rates.

Other financial results generated a loss of $21.3 million in 2010, compared to $64.2 million during 2009. These results largely reflect losses on net foreign exchange transactions and the fair value of derivative instruments and are to a large extent offset by changes to our net equity position. These losses are mainly attributable to variations in the exchange rates between our subsidiaries’ functional currencies (other than the U.S. dollar) and the U.S. dollar in accordance with IFRS, principally the variations of the Brazilian real, the Euro and the Japanese yen against the U.S. dollar.

Equity in earnings of associated companies generated a gain of $70.1 million in 2010, compared to a gain of $87.0 million in 2009. These gains were derived mainly from our equity investment in Ternium.

Income tax charges totalled $450.0 million in 2010, equivalent to 30% of income before equity in earnings of associated companies and income tax, compared to $513.2 million in 2009, equivalent to 31% of income before equity in earnings of associated companies and income tax.

Result for discontinued operations amounted to a loss of $28.1 million in 2009, relating to the discontinuation of Tavsa and Matesi’s operations following their nationalization by the Venezuelan government, while there were no such results in 2010.

Net income decreased to $1,141.0 million in 2010, compared to $1,207.6 million in 2009, mainly reflecting lower operating results, better financial results and lower income taxes.

Income attributable to equity holders was $1,127.4 million, or $0.95 per share ($1.91 per ADS), in 2010, compared to $1,161.6 million, or $0.98 per share ($1.97 per ADS) in 2009.

Income attributable to non-controlling interest was $13.7 million in 2010, compared to $46.0 million in 2009, mainly reflecting lower results at our Brazilian subsidiary, Confab, and losses at our Japanese subsidiary NKKTubes.

Fiscal Year Ended December 31, 2009, Compared to Fiscal Year Ended December 31, 2008

Net Sales, Cost of Sales and Operating Income

The following table shows our net sales by business segment for the periods indicated below:


*Millions of U.S. dollars*	For the year ended December 31,								Increase / (Decrease)
	2009				2008				Increase / (Decrease)
Tubes		6,670.9	82	%		10,010.1	84	%		(33	%)
Projects		986.5	12	%		1,270.9	11	%		(22	%)
Others		491.8	6	%		706.8	6	%		(30	%)

Total		8,149.3	100	%		11,987.8	100	%		(32	%)

The following table indicates our sales volume of seamless and welded pipes by business segment for the periods indicated below:


*Thousands of tons*	For the year ended December 31,				Increase / (Decrease)
	2009		2008		Increase / (Decrease)
Tubes – Seamless		1,970		2,818		(30	%)
Tubes – Welded		346		1,057		(67	%)

Tubes – Total		2,316		3,875		(40	%)
Projects – Welded		334		591		(43	%)

Total – Tubes + Projects		2,650		4,466		(41	%)

Tubes


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2009			2008			Increase / (Decrease)
Net sales
- North America		2,756.1			4,519.3			(39	%)
- South America		981.9			1,248.7			(21	%)
- Europe		828.8			1,705.6			(51	%)
- Middle East & Africa		1,622.6			1,809.9			(10	%)
- Far East & Oceania		481.5			726.6			(34	%)

Total net sales		6,670.9			10,010.1			(33	%)
Cost of sales (% of sales)		57	%		53	%
Operating income		1,576.8			2,827.0			(44	%)
Operating income (% of sales)		24	%		28	%

Net sales of tubular products and services decreased 33% to $6,670.9 million in 2009, compared to $10,010.1 million in 2008, due to a sharp reduction in volumes (down 40%). This reduction in volumes was partially offset by higher average selling prices (up 12%), reflecting, in part, a higher proportion of sales of specialized high-end products and the lagged effect of price variations, as average selling prices rose to a peak in the second quarter of 2009. In North America, notwithstanding higher demand for OCTG products in Mexico, sales decreased 39%, due primarily to substantially lower demand for OCTG and line pipe products in the United States and Canada, reflecting the decline in drilling activity and inventory adjustments following the surge in imports of Chinese products in the second half of 2008 and first half of 2009. In South America, sales decreased, reflecting sharply lower demand from all sectors in Argentina and for OCTG in Venezuela. In Europe, sales were affected by lower demand from all sectors, including the process and power plant sector, the industrial and automotive sector and the oil and gas sector. Sales in the Middle East and Africa declined by 10%, as reduced demand for OCTG products was partially offset by higher sales of deepwater linepipe products in West Africa. In the Far East and Oceania, sales decreased in China and demand for all our products decreased in the rest of the region.

Cost of sales of tubular products and services, expressed as a percentage of net sales, rose from 53% to 57%, mainly due to the negative effect of low production capacity utilization rates, on efficiency, absorption of fixed and semi-fixed costs and on the time lag between raw material cost decreases and their impact on the cost of sales.

Operating income from tubular products and services, decreased 44% to $1,576.8 million in 2009, from $2,827.0 million in 2008, mainly due to a significant decrease in volumes. While operating income in 2008 included impairment charges amounting to $354.9 million, there was no impairment charge in 2009.

Projects


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2009			2008			Increase / (Decrease)
Net sales		986.5			1,270.9			(22	%)
Cost of sales (% of sales)		71	%		70	%
Operating income		208.6			249.0			(16	%)
Operating income (% of sales)		21	%		20	%

Net sales of pipes for pipeline projects decreased 22% to $986.5 million in 2009, compared to $1,270.9 million in 2008, reflecting a sharp decrease in shipments to gas and other pipeline projects in Brazil, Argentina and Colombia,

mainly due to the fact that most of the projects were concluded and the order backlog declined throughout the year, although the decrease was partially offset by higher average selling prices particularly for offshore projects in Brazil.

Operating income from pipes for pipeline projects decreased 16% to $208.6 million in 2009, compared to $249.0 million in 2008, due to the decrease in net sales and a stable operating margin.

Others


*Millions of U.S. dollars*	For the year ended December 31,						Increase / (Decrease)
	2009			2008			Increase / (Decrease)
Net sales		491.8			706.8			(30	%)
Cost of sales (% of sales)		79	%		73	%
Operating income		28.1			49.6			(43	%)
Operating income (% of sales)		6	%		7	%

Net sales of other products and services decreased 30% to $491.8 million in 2009, compared to $706.8 million in 2008, mainly due to lower sales of welded pipes for electric conduits in the United States and lower sales of sucker rods as a result of the global economic downturn.

Operating income from other products and services, decreased 43% to $28.1 million in 2009, compared to $49.6 million in 2008, due to the decrease in net sales.

SG&A, increased as a percentage of net sales to 18.1% in 2009, compared to 14.9% in 2008, mainly due to the effect of fixed and semi-fixed expenses over lower revenues. However, in absolute terms, SG&A decreased $314.2 million to $1,473.8 million in 2009, compared to $1,788.0 million in 2008, mainly due to lower commissions, freight and other selling expenses, taxes and labor costs, reflecting lower activity in terms of net sales.

Other operating income and expenses resulted in net income of $3.0 million in 2009, compared to a net loss of $375.9 million in 2008, which loss was mainly related to impairment charges at our North American operations.

Net interest expenses totalled $87.5 million in 2009, compared to net interest expenses of $131.2 million in 2008, reflecting; the change in our net debt position (which went from a net debt position of $1,392.4 million at 31 December 2008, to a net cash position of $675.7 million at December 31, 2009) and lower interest rates.

Other financial results generated a loss of $64.2 million in 2009, compared to a loss of $99.9 million during 2008. These results largely reflect losses on net foreign exchange transactions and the fair value of derivative instruments and are to a large extent offset by changes to our net equity position. These losses are mainly attributable to variations in the exchange rates between our subsidiaries’ functional currencies (other than the U.S. dollar) and the U.S. dollar in accordance with IFRS (mainly the Brazilian real, the Canadian dollar and the Mexican peso).

Equity in earnings of associated companies generated a gain of $87.0 million in 2009, compared to a gain of $89.4 million in 2008. These gains were derived mainly from our equity investment in Ternium.

Income tax charges of $513.2 million were recorded during 2009, equivalent to 31% of income before equity in earnings of associated companies and income tax, like in 2008, when excluding the effect of impairment losses during the year amounting to $394.3 million, the tax rate was also 31%.

Results for discontinued operations reflected a loss of $28.1 million in 2009, relating to the nationalization of certain Venezuelan subsidiaries by the Venezuelan government, compared to a gain of $306.9 million in 2008, relating to income from discontinued operations, mainly derived from the sale of Hydril’s pressure control business.

Net income decreased to $1,207.6 million in 2009, compared to $2,275.6 million in 2008, mainly reflecting lower operating results.

Income attributable to equity holders was $1,161.6 million, or $0.98 per share ($1.97 per ADS), in 2009, compared to $2,124.8 million, or $1.80 per share ($3.60 per ADS) in 2008.

Income attributable to non-controlling interests was $46.0 million in 2009, compared to $150.8 million in 2008, mainly reflecting lower results at our Brazilian subsidiary, Confab, and losses at our Japanese subsidiary, NKKTubes.

B.	Liquidity and Capital Resources

The following table provides certain information related to our cash generation and changes in our cash and cash equivalents position for each of the last three years:

Millions of U.S. dollars


	For the year ended December 31,
	2010			2009			2008
Net cash provided by operating activities		870.8			3,063.9			1,465.0
Net cash (used in) provided by investing activities		(920.8	)		(1,031.0	)		741.0
Net cash (used in) financing activities		(651.6	)		(2,028.7	)		(1,589.0	)

(Decrease) Increase in cash and cash equivalents		(701.6	)		4.3			617.0
Effect of exchange rate changes		(6.9	)		9.1			(46.3	)
Decrease in cash due to deconsolidation		—			(9.7	)		—

Cash and cash equivalents at the beginning of year		1,528.7			1,525.0			954.3

Cash and cash equivalents at the end of year		820.2			1,528.7			1,525.0

Our financing strategy aims at maintaining adequate financial resources and access to additional liquidity. During 2010, we counted on cash flows from operations as well as on short-term bank financing to fund our operations.

We believe that funds from operations, the availability of liquid financial assets and our access to external borrowing through the financial markets will be sufficient to satisfy our working capital needs, to finance our planned capital spending program, to service our debt in the foreseeable future and to address short-term changes in business conditions. During 2010, our net cash position (cash and other current investments less total borrowings) decreased by $400.2 million to $275.6 million at December 31, 2010, from $675.7 million at December 31, 2009.

We have a conservative approach to the management of our liquidity, which consist mainly of cash and cash equivalents and other current investments, comprising cash in banks, liquidity funds and highly liquid short and medium-term securities. These assets are carried at fair market value, or at historical cost which approximates fair market value.

We hold primarily investments in liquidity funds and variable or fixed-rate securities from investment grade issuers. We concentrate our cash in major financial centers. As of December 31, 2010, U.S. dollar denominated liquid assets represented 84%, compared to 82% at the end of 2009. At December 31, 2010, liquid financial assets as a whole (i.e., cash and cash equivalents and other current investments) were 10.6% of total assets compared to 15.7% at the end of 2009.

Cash and cash equivalents (excluding bank overdraft) decreased by $699.0 million, to $843.9 million at December 31, 2010, compared with $1,542.8 million at December 31, 2009. On the other hand, Other current investments increased $96.5 million to $676.2 million as of December 31, 2010 from $579.7 million as of December 31, 2009.

Fiscal Year Ended December 31, 2010, Compared to Fiscal Year Ended December 31, 2009

Operating activities

Net cash provided by operations during 2010 was $870.8 million, compared to $3,063.9 million during 2009. Working capital increased by $644.0 million during 2010, compared with a decrease of $1,737.3 million in 2009, reflecting the improvement in activity levels. The increase in working capital during 2010 is the result of the following:

•

an increase in inventories of $773.3 million, as a result of increased business activity; and

•

an increase in trade receivables of $111.3 million, mainly due to higher sales in the fourth quarter of 2010 compared to the same period of 2009; partially offset by

•

an increase in trade payables of $261.8 million, also reflecting higher levels of activity.

Investing activities

Net cash used in investing activities in 2010 was $920.8 million, compared to $1,031.0 million in 2009, due to the following:

•

higher capital expenditures ($847.3 million in 2010, compared to $460.9 million in 2009), primarily attributable to the construction of the new small diameter rolling mill at our Veracruz facility in Mexico;

•

lower investments in short term securities ($96.5 million in 2010, compared to $533.8 million in 2009); and

•

negligible investments in acquisitions of subsidiaries and associated companies in 2010, compared to acquisitions amounting to $64.0 million in 2009.

Financing activities

Net cash used in financing activities, including dividends paid, proceeds and repayments of borrowings, was $651.6 million in 2010, compared to $2,028.7 million in 2009.

Dividends paid, including dividends paid to non-controlling shareholders in subsidiaries, amounted to $433.3 million in 2010, of which $248 million were paid to equity holders in respect of the 2009 fiscal year, while $153 million were paid to equity holders in November 2010, as an interim dividend in respect of the dividend corresponding to the 2010 fiscal year. This compares to $553.7 million paid in 2009, of which $354 million were paid to equity holders in respect of the 2008 fiscal year, while $153 million were paid to equity holders in November 2009, as an interim dividend for the 2009 fiscal year.

Net repayments of borrowings (repayments less proceeds) totaled $215.3 million in 2010, compared to $1,465.4 million in 2009.

Our total liabilities to total assets ratio was 0.27:1 as of December 31, 2010 and 0.28:1 as of December 31, 2009.

Fiscal Year Ended December 31, 2009, Compared to Fiscal Year Ended December 31, 2008

Operating activities

In 2009, notwithstanding the decrease in operating income, net cash provided by operations increased to $3,063.9 million compared to $1,465.0 million in 2008, primarily reflecting a decrease in working capital. Working capital decreased by $1,737.3 million in 2009, compared to an increase of $1,051.6 million in 2008. The decrease in working capital comprised mainly:

•

a decrease in inventories of $1,414.2 million, reflecting primarily a decrease in business activity;

•

a decrease in trade receivables of $792.3 million, mainly due to lower sales; and

•

a decrease in trade payables and customer advances of $316.9 million, and $180.5 million respectively, also due to the lower level of business activity.

Investing activities

Net cash used in investing activities in 2009 was $1,031.0 million, compared to net cash provided by investing activities amounting to $741.0 million in 2008, with the main differences being:

•

in 2008, we received the proceeds from the sale of Hydril’s pressure control business, amounting to approximately $1.1 billion; and

•

in 2009, we invested $533.8 million in short term securities, compared to net proceeds of $41.7 million in 2008.

Capital expenditures increased slightly to $460.9 million in 2009, compared to $443.2 million in 2008. For more information on our capital expenditures, see Item 4.B. “Information on the Company - Business Overview – Capital Expenditure Program”.

Financing activities

Net cash used in financing activities, including dividends paid, proceeds and repayments of borrowings, was $2,028.7 million in 2009, compared to $1,589.0 million in 2008.

Dividends paid, including dividends paid to minority shareholders in subsidiaries, amounted to $553.7 million in 2009, of which $354 million were paid to equity holders in respect of the 2008 fiscal year, while $153 million were paid to equity holders in November 2009, as an interim dividend in respect of the dividend corresponding to the 2009 fiscal year. This compares to $535.8 million paid in 2008, of which $295 million were paid in respect of the 2007 fiscal year and $153 million were paid to equity holders in November 2008, as an interim dividend for the 2008 fiscal year.

Net repayments of borrowings (repayments less proceeds) totaled $1,465.4 million in 2009, compared to $1,034.6 million in 2008.

Our total liabilities to total assets ratio decreased to 0.28:1 as of December 31, 2009, compared to 0.42:1 as of December 31, 2008.

Principal Sources of Funding

In 2010, we counted mainly on cash flows from operations to fund our transactions and short-term bank borrowings were used as needed throughout the year.

Financial liabilities

During 2010, total financial debt decreased by 14%, to $1,244.5 million at December 31, 2010, from $1,446.8 million at December 31, 2009.

Our financial liabilities (other than trade payables and derivative financial instruments) consist mainly of bank loans. As of December 31, 2010 U.S. dollar-denominated financial debt plus other currencies denominated financial debt swapped to the U.S. dollar represented 90% of total financial debt. For further information about our financial debt, please see note 20 “Borrowings” to our audited consolidated financial statements included in this annual report.

The following table shows the composition of our financial debt at December 31, 2010 and 2009:


*Thousands of U.S. dollars*	2010		2009
Bank borrowings		1,215,246		1,422,762
Bank overdrafts		23,696		14,122
Other loans, including related companies		5,131		9,294
Finance lease liabilities		423		586

Total borrowings		1,244,496		1,446,764

The weighted average interest rates before tax (calculated using the rates set for each instrument at year end, in its corresponding currency and considering derivative financial instruments designated for hedge accounting), amounted to 4.08% at December 31, 2010 and to 4.02% at December 31, 2009.

The maturity of our financial debt is as follows:


*Thousands of U.S. dollars* At December 31, 2010	1 year or less		1 - 2 years		2 – 3 years		3 - 4 years		4 - 5 years		Over 5 years		Total
Borrowings		1,023,926		154,227		33,203		7,999		7,873		17,268		1,244,496
Interests to be accrued		19,075		4,818		1,813		1,544		1,357		2,060		30,667
Interest rate derivative contracts		5,359		—		—		—		—		—		5,359

Total		1,048,360		159,045		35,016		9,543		9,230		19,328		1,280,522

Our current debt to total debt ratio increased from 0.55:1 as of December 31, 2009 to 0.82:1 as of December 31, 2010.

For information on our derivative financial instruments, please see Item 11 “Quantitative and Qualitative Disclosure about Market Risk – Accounting for Derivative Financial Instruments and Hedging Activities” and note 25 “Derivative financial instruments” to our audited consolidated financial statements included in this annual report.

For information regarding the extent to which borrowings are at fixed rates, please see Item 11 “Quantitative and Qualitative Disclosure about Market Risk”.

Significant Borrowings

Our most significant borrowings as of December 31, 2010 were as follows:

Millions of U.S. dollars

Date

Borrower

Type

Original Principal
Amount

Outstanding Principal
amount as of
December 31, 2010

Maturity

September 2006

Tamsa

Syndicated loan

700.0

155.6

October 2011

April 2007

Hydril

Syndicated loan

300.0

100.0

May 2012

June 2008

Dalmine

Bilateral

150.0

125.0

June 2013

2010

Siderca

Short-term bank loans

342.6

Several in 2011

2010

Tamsa

Short-term bank loans

200.2

Several in 2011

As of December 31, 2010, Tenaris was in compliance with all of its financial and other covenants.

For further information on our borrowings, please see note 20 “Borrowings” to our audited consolidated financial statements included in this annual report.

C.	Research and Development, Patents and Licenses, Etc.

See Item 4.B. “Information on the Company – Business Overview – Research and Development”.

D.	Trend Information

Principal Factors Affecting Oil and Gas Prices and Demand for Steel Pipes from the Global Oil and Gas Industry.

Sales to the oil and gas industry worldwide represent a high percentage of our total sales, and demand for steel pipes from the global oil and gas industry is a significant factor affecting the general level of volumes and prices for our products. Downward pressures on oil and gas prices usually result in lower oil and gas drilling activity and investment throughout the oil and gas industry with consequently lower demand for our steel pipe products and, in some circumstances, upward pressures can result in higher demand from our oil and gas customers.

Drilling activity in the United States and Canada is sensitive to the level of regional gas prices as well as oil prices, as a significant proportion of wells drilled are gas wells. In the rest of the world, however, a majority of wells drilled are oil wells, though the development of gas reserves for regional consumption and export in the form of LNG has been increasing. Whereas oil prices are similar in most parts of the world because oil is a fully tradable commodity, gas prices are influenced by regional factors. In North America, where gas production is extensively developed and there is an extensive regional pipeline system, these factors include available gas storage capacity and seasonal weather patterns, particularly winter temperatures in the United States. LNG prices are usually established in relation to international oil prices.

International oil prices depend on diverse factors. On the supply side, major oil- and gas-producing nations and companies frequently collaborate to control the supply (and thus the price) of oil in the international markets. A major vehicle for this collaboration is OPEC. Many of our customers are state-owned companies in member countries of OPEC, or otherwise cooperate with OPEC in controlling the supply and price of oil. Another factor that has affected the international price level of oil has to do with the political and socioeconomic conditions of oil-producing countries, such as Nigeria, Venezuela and the persistence of armed conflicts affecting the Middle East region which is home to a substantial proportion of the world’s known oil reserves. On the demand side, economic conditions and the level of oil inventories in the leading industrial nations of the world, and more recently China, which constitute the largest oil consuming nations, also play a significant role in oil prices.

With the onset of the global economic and financial crisis and its impact on global consumption of oil and gas, oil and gas prices collapsed in the second half of 2008, after four years of persistently high oil and gas prices that encouraged oil and gas companies to increase their spending and drilling activity to offset declining rates of production from mature fields and to explore and develop new reserves. In 2009, global oil prices rose from their low of $30 per barrel and subsequently fluctuated within a $70-$90 per barrel range until the end of 2010 as global oil demand, led by increased consumption in non-OECD countries, began to recover in the second half of the year and OPEC producers adjusted their production output. Since the end of 2010, oil prices have risen further and have increased in volatility following the political uprisings in North Africa and the Middle East. North American gas prices, however, have remained low fluctuating within a range of $3-$6 per million BTU. Advances in drilling technology have encouraged producers to develop productive gas shale deposits, which resulted in continuing increases in U.S. gas production in 2009 and 2010 despite a substantial drop in gas drilling activity compared to the five years from 2003 to 2008. This development has also impacted gas prices in the rest of the world, as it coincides with an increase in LNG capacity, much of which was built in the expectation of growing demand for gas imports in the United States. Global drilling activity recovered in 2010, following the decrease in 2009; the annual average of the international count of active drilling rigs, published by Baker Hughes, increased 10% in 2010 compared to 2009 and had exceeded previous record levels by year end, while the corresponding rig count in the United States and Canada, increased 45% in 2010 compared to 2009. The increase in drilling activity in the United States and Canada has been largely driven by oil drilling

but gas drilling activity, particularly in productive shale gas and liquids-rich plays, also increased.

A growing proportion of exploration and production spending by oil and gas companies has been directed at offshore, deep drilling and non-conventional drilling operations in which high-value tubular products, including special steel grades and premium connections, are usually specified. Technological advances in drilling techniques and materials are opening up new areas for exploration and development. More complex drilling conditions, combined with increased regulatory pressures and more stringent industry standards following the blow-out of the Macondo well in the U.S. Gulf of Mexico, are expected to continue to demand new and high value products and services in most areas of the world.

The tables below show the annual average number of active oil and gas drilling rigs, or rig count, in the United States, Canada, International (worldwide excluding the United States and Canada and excluding Iran and Sudan as well as onshore China and Russia) and worldwide, as published by Baker Hughes Inc., for the years indicated and the percentage increase or decrease over the previous year. Baker Hughes, a leading oil service company, has published its rig counts on a monthly basis since 1975 as a general indicator of activity in the oil and gas sector.

Rig count


	2010		2009		2008		2007		2006
International		1,094		997		1,079		1,005		925
Canada		351		221		379		343		470
United States		1,541		1,086		1,878		1,768		1,648

Worldwide		2,985		2,304		3,336		3,116		3,043

Percentage increase (decrease) over the previous year


	2010			2009			2008			2007
International		10	%		(8	%)		7	%		9	%
Canada		59	%		(42	%)		10	%		(27	%)
United States		42	%		(42	%)		6	%		7	%

Worldwide		30	%		(31	%)		7	%		2	%

E.	Off-Balance Sheet Arrangements

We do not use “off-balance sheet arrangements” as such term is defined by applicable SEC rules. However, we do have various off-balance sheet commitments, as described in note 26 “Contingencies, commitments and restrictions on the distribution of profits” to our audited consolidated financial statements included in this annual report.

F.	Contractual Obligations

The following table summarizes our contractual obligations at December 31, 2010, and the effect such obligations are expected to have on our liquidity and cash flow in future periods:

Thousands of U.S. dollars


	Payments Due by Period as of December 31, 2010
Contractual Obligations and Commitments	Total		Less than 1 year		1-3 years		3-5 years		More than 5 years
Borrowings		1,244,073		1,023,763		187,170		15,872		17,268
Finance Lease Obligations		423		163		260		—		—

Total Borrowings		1,244,496		1,023,926		187,430		15,872		17,268
Interest to be accrued (1)		30,667		19,075		6,631		2,901		2,060
Interest rate derivatives contract		5,359		5,359		—		—		—
Purchase Commitments		793,026		316,244		352,957		70,757		53,068

Total Contractual Obligations and Commitments		2,073,548		1,364,604		547,018		89,530		72,396

(1)	Interest to be accrued approximates estimated interest payments

Most purchase commitments as of December 31, 2010, disclosed in the table above, consist of commitments to purchase steel for the production of tubes in North America.

G.	Recent Developments

Annual General Meeting and Extraordinary General Meeting of Shareholders

On June 1, 2011, the Company’s annual general shareholders’ meeting approved all resolutions on its agenda. Among other resolutions adopted at the meeting, the shareholders approved the consolidated financial statements for the years ended December 31, 2010, 2009 and 2008, the annual accounts as at December 31, 2010, and the related reports and certifications.

The meeting also approved the payment of a dividend for the year ended December 31, 2010, of $0.34 per share (or $0.68 per ADS), or approximately $401 million, which includes the interim dividend of $0.13 per share (or $0.26 per ADS) paid in November 2010. Tenaris paid the balance of the annual dividend in the amount of $0.21 per share ($0.42 per ADS), or approximately $248 million, on June 23, 2011, with an ex-dividend date of June 20, 2011.

The annual general shareholders’ meeting approved the re-election of the current members of the board of Directors, each to hold office until the meeting that will be convened to decide on the 2011 accounts.

The board of directors subsequently confirmed and re-appointed Amadeo Vázquez y Vázquez, Jaime Serra Puche and Roberto Monti as members of Tenaris’s audit committee, with Mr. Vázquez y Vázquez to continue as chairman. All three members of the audit committee qualify as independent directors under the articles and applicable law.

The meeting appointed PricewaterhouseCoopers S.à r.l., Réviseur d’enterprises agréé, as Tenaris’s independent auditors for the fiscal year ending December 31, 2011.

The extraordinary general meeting of shareholders also held on June 1, 2011, approved, among other amendments to the articles of association, to change the date of the annual general meetings of shareholders so that in the future they will be held on the first Wednesday of May of each year.

Settlement with U.S. governmental authorities

On May 17, 2011, Tenaris reached a settlement with the DOJ and the SEC, regarding the investigation described in note 26 “Contingencies, commitments and restrictions on the distribution of profits – Ongoing investigation” to our audited consolidated financial statements included in this annual report.

In 2009, Tenaris announced that it had learned from one of its customers in Central Asia that certain sales agency payments made by one of the Company’s subsidiaries may have improperly benefited employees of the customer and other persons, potentially in violation of the U.S. Foreign Corrupt Practices Act (FCPA). The audit committee of the Company’s board of directors engaged external counsel in connection with a review of these payments and related matters. The Company voluntarily notified the SEC and the DOJ, shared the results of the audit committee’s review with the SEC and the DOJ, and cooperated in the investigations conducted by the SEC and the DOJ.

On May 17, 2011, Tenaris settled the SEC’s and the DOJ’s FCPA investigations. The settlements describe conduct by former Tenaris regional sales personnel relating to payments to officials of a state controlled oil and gas production company in the Caspian region, as well as certain record keeping and internal control failures relating to this conduct. The settlements also state that Tenaris voluntarily disclosed this conduct to the SEC and the DOJ in a timely and complete manner, conducted an internal investigation, provided thorough, real time cooperation to the SEC and the DOJ, and undertook remediation efforts, including voluntary enhancements to its compliance program. In the settlement with the SEC, Tenaris agreed to pay approximately $5.4 million in disgorgement of profits and interest, and in the settlement with the DOJ Tenaris agreed to pay a $3.5 million penalty. Tenaris timely paid those amounts to the DOJ and the SEC.

Venezuela moves forward with expropriation of Matesi

In June 2011, within the framework of the Venezuelan National Assembly’s law declaring all of Matesi’s assets to be of public and social interest and ordering the Executive Branch to take the necessary measures for the expropriation of such assets, President Chavez issued Decree 8280/2011, which orders the expropriation of Matesi’s assets as may be required for the implementation of a stateowned project for the production, sale and distribution of briquettes, and further instructs to commence negotiations and take any actions required for the acquisition of such assets.

Tenaris continues to reserve all of its rights under Venezuelan and international law, including investment treaties, and will take legal actions against Venezuela to seek prompt, fair and adequate compensation for its entire interest (including assets and liabilities) in Matesi.

Item 6.

Directors, Senior Management and Employees

A.	Directors and Senior Management

Board of Directors

Management of the Company is vested in a board of directors with the broadest power to act on behalf of the Company and accomplish or authorize all acts and transactions of management and disposal that are within its corporate purpose and which are not specifically reserved in the articles of association or by applicable law to the general shareholders’ meeting. The Company’s articles of association provide for a board of directors consisting of a minimum of three and a maximum of fifteen directors; however, or as long as the Shares are listed on at least one stock exchange, the minimum number of directors must be five. The Company’s current board of directors is composed of ten directors.

The board of directors is required to meet as often as required by the interests of the Company and at least four times per year. A majority of the members of the board of directors in office present or represented at the board of director’s meeting constitutes a quorum, and resolutions may be adopted by the vote of a majority of the directors present or represented. In the case of a tie, the chairman is entitled to cast the deciding vote.

Directors are elected at the annual ordinary general shareholders’ meeting to serve one-year renewable terms, as determined by the general shareholders’ meeting. The general shareholders’ meeting also determines the directors’ compensation. The general shareholders’ meeting may dismiss all or any one member of the board of directors at any time, with or without cause, by resolution passed by a simple majority vote, irrespective of the number of shares present of represented at the meeting.

The following table sets forth the name of the Company’s current directors, their respective positions on the board, their principal occupation, their years of service as board members and their age.


Name	Position	Principal Occupation	Years as Director	Age at December 31, 2010
Roberto Bonatti⁽¹⁾	Director	President of San Faustin	8	61
Carlos Condorelli	Director	Director of Tenaris and Ternium	4	59
Carlos Franck	Director	President of Santa María	8	60
Roberto Monti	Director	Member of the board of directors of Petrobras Energia	6	71
Gianfelice Mario Rocca⁽¹⁾	Director	Chairman of the board of directors of San Faustin	8	62
Paolo Rocca⁽¹⁾	Director	Chairman and chief executive officer of Tenaris	9	58
Jaime Serra Puche	Director	Chairman of SAI Consultores	8	59
Alberto Valsecchi	Director	Director of Tenaris	3	66
Amadeo Vázquez y Vázquez	Director	Director of Gas Natural Ban S.A. and member of Asociación Empresaria Argentina	8	68
Guillermo Vogel	Director	Vice chairman of Tamsa	8	60

(1)	Paolo Rocca and Gianfelice Rocca are brothers, and Roberto Bonatti is Paolo and Gianfelice Rocca’s first cousin.

Roberto Bonatti. Mr. Bonatti is a member of the Company’s board of directors. He is a grandson of Agostino Rocca, founder of the Techint group, a group of companies controlled by San Faustin. Throughout his career in the Techint group he has been involved specifically in the engineering and construction and corporate sectors. He was first employed by the Techint group in 1976, as deputy resident engineer in Venezuela. In 1984, he became a director of San Faustin, and since 2001 he has served as its president. In addition, Mr. Bonatti currently serves as president of Tecpetrol S.A. and Techint Compañia Técnica Internacional S.A.C.I. He is also a member of the board of directors of Ternium, Siderca and Siderar S.A.I.C., or Siderar. Mr. Bonatti is an Italian citizen.

Carlos Condorelli. Mr. Condorelli is a member of the Company’s board of directors. He served as our chief financial officer from October 2002 until September 2007. He is also a board member of Ternium. He began his career within the Techint group in 1975 as an analyst in the accounting and administration department of Siderar. He has held several positions within Tenaris and other Techint group companies, including finance and administration director of Tamsa and president of the board of directors of Empresa Distribuidora La Plata S.A., or Edelap, an Argentine utilities company. Mr. Condorelli is an Argentine citizen.

Carlos Franck. Mr. Franck is a member of the Company’s board of directors. He is president of Santa María S.A.I.F. and Inverban S.A. and a member of the board of directors of Siderca, Techint Financial Corporation N.V., Techint Holdings S.àr.l., Siderar and Tecgas N.V. He has financial planning and control responsibilities in subsidiaries of San Faustin. He serves as treasurer of the board of the Di Tella University. Mr. Franck is an Argentine citizen.

Roberto Monti. Mr. Monti is a member of the Company’s board of directors. He is member of the board of directors of Petrobras Energia. He has served as vice president of Exploration and Production of Repsol YPF and chairman and chief executive officer of YPF. He was also president of Dowell, a subsidiary of Schlumberger and president of Schlumberger Wire & Testing division for East Hemisphere Latin America. Mr. Monti is an Argentine citizen.

Gianfelice Mario Rocca. Mr. Rocca is a member of the Company’s board of directors. He is a grandson of Agostino Rocca. He is chairman of the board of directors of San Faustin, a member of the board of directors of Ternium, president of the Humanitas Group and honorary president of the board of directors of Techint Compagnia Tecnica Internazionale S.p.A. and president of Tenova S.p.A. In addition, he sits on the board of directors or executive committees of several companies, including Allianz S.p.A and Buzzi Unicem. He is vice president of Confindustria, the leading association of Italian industrialists. He is a member of the Advisory Board of Allianz Group, the Trilateral Commission and the European Advisory Board of the Harvard Business School. Mr. Rocca is an Italian citizen.

Paolo Rocca. Mr. Rocca is the chairman of the Company’s board of directors and our chief executive officer. He is a grandson of Agostino Rocca. He is also chairman of the board of directors of Tamsa. He is also the chairman of the board of directors of Ternium, a director and vice president of San Faustin, and a director of Techint Financial Corporation N.V. Mr. Rocca is vice chairman of the World Steel Association and a member of the International Advisory Committee of the NYSE Euronext (New York Stock Exchange). Mr. Rocca is an Italian citizen.

Jaime Serra Puche. Mr. Serra Puche is a member of the Company’s board of directors. He is the chairman of SAI Consultores, a Mexican consulting firm, and a member of the board of directors of Chiquita Brands International, the Mexico Fund, Grupo Vitro, Grupo Modelo and Grupo Financiero BBVA Bancomer. Mr. Serra Puche served as Mexico’s Undersecretary of Revenue, Secretary of Trade and Industry, and Secretary of Finance. He led the negotiation and implementation of NAFTA. Mr. Serra Puche is a Mexican citizen.

Alberto Valsecchi. Mr. Valsecchi is a member of the Company’s board of directors. He served as our chief operating officer from February 2004 until July 2007. He joined the Techint group in 1968 and has held various positions within Tenaris and other Techint group companies. He has retired from his executive positions. He is also a member of the board of directors of San Faustin and has been elected as the chairman of the board of directors of Dalmine, a position he assumed in May 2008. Mr. Valsecchi is an Italian citizen.

Amadeo Vázquez y Vázquez. Mr. Vázquez y Vázquez is a member of the Company’s board of directors. He is an independent member of the board of directors of Gas Natural Ban S.A. He is a member of the Asociación Empresaria Argentina, of the Fundación Mediterránea, and of the Advisory Board of the Fundación de Investigaciones Económicas Latinoamericanas. He served as chief executive officer of Banco Río de la Plata S.A. until August 1997 and was also the chairman of the board of directors of Telecom Argentina S.A. until April 2007. Mr. Vázquez y Vázquez is a Spanish and Argentine citizen.

Guillermo Vogel. Mr. Vogel is a member of the Company’s board of directors. He is the vice chairman of Tamsa, the chairman of Grupo Collado S.A.B. de C.V, the vice chairman of Estilo y Vanidad S.A. de C.V. and a member of the board of directors of each of Alfa S.A.B. de C.V., the American Iron and Steel Institute, the North American Steel Council, the Universidad Panamericana and the IPADE. In addition, he is a member of the board of directors and the investment committee of the Corporación Mexicana de Inversiones de Capital and a member of the board of directors and the audit committee of HSBC (México). Mr. Vogel is a Mexican citizen.

Director Liability

Under Luxembourg law, a director may be liable to the Company for any damage caused by management errors, such as wrongful acts committed during the execution of his or her mandate, and to the Company, its shareholders and third parties in the event that the Company, its shareholders or third parties suffer a loss due to an infringement of either the Company’s articles of association or the Luxembourg Law of 10 August 1915 on commercial companies, as amended, or the Luxembourg Companies Law.

Under Luxembourg law, any director having a conflict of interest in respect of a transaction submitted for approval to the board of directors may not take part in the deliberations concerning such transaction and must inform the board of such conflict and to cause a record of his statement to be included in the minutes of the meeting. Subject to certain exceptions, transactions in which any directors may have had an interest conflicting with that of the Company must be reported at the next general shareholders’ meeting following any such transaction.

A director will not be liable for acts committed in accordance with a board resolution if, notwithstanding his or her presence at the board meeting at which such resolution was adopted such director advised the board of directors that he or she opposed the resolution and caused a record of such opposition to be included in the minutes of the meeting.

Causes of actions against directors for damages may be initiated by the Company upon resolution of the shareholders passed by a simple majority vote, irrespective of the number of shares present or represented at the meeting. Causes of action against directors who misappropriate corporate assets or commit a breach of trust may be brought by any shareholder from personal losses different from those of the Company.

It is customary in Luxembourg that the shareholders expressly discharge the members of the board of directors from any liability arising out of or in connection with the exercise of their mandate when approving the annual accounts of the Company at the annual general shareholders meeting. However, such discharge will not release the directors from liability for any damage caused by wrongful acts committed during the execution of their mandate or due to an infringement of either the Luxembourg law on commercial companies or the Company’s articles of association vis-à-vis third parties.

Auditors

The Company’s articles of association require the appointment of at least one independent auditor chosen from among the members of the Luxembourg Institute of Independent Auditors (Institut des réviseurs d’entreprises). The primary responsibility of the independent auditor is to audit the Company’s annual accounts and to submit a report on the accounts to shareholders at the annual shareholders’ meeting. Auditors are appointed by the general shareholders’ meeting upon recommendation from the audit committee through a resolution passed by a simple majority vote, irrespective of the number of Shares present or represented to serve one-year renewable terms. Auditors may be dismissed by the general shareholders’ meeting at any time, with or without cause. Luxembourg law does not allow directors to serve concurrently as independent auditors. As part of their duties, the auditors report directly to the audit committee.

The Company’s audit committee is responsible for, among other things, the oversight of the Company’s independent auditors. The audit committee has adopted in its charter a policy of pre-approval of audit and permissible non-audit services provided by its independent auditors. Under the policy, the audit committee makes its recommendations to the shareholders’ meeting concerning the continuing appointment or termination of the Company’s independent auditors. On a yearly basis, the audit committee reviews together with management and the independent auditor, the audit plan, audit related services and other non-audit services and approves the related fees. Any changes to the approved fees must be reviewed and approved by the audit committee. In addition, the audit committee delegates to its Chairman the authority to consider and approve, on behalf of the audit committee, additional non-audit services that were not recognized at the time of engagement, which must be reported to the other members of the audit committee at its next meeting. No services outside the scope of the audit committee’s approval can be undertaken by the independent auditor.

Our independent auditors for the fiscal year ended December 31, 2010 appointed by the Shareholders meeting held on June 2, 2010, were PWC (acting, in connection with our annual accounts and annual consolidated financial statements required under Luxembourg law, through PricewaterhouseCoopers S.à r.l., Réviseur d’entreprises agréé, and in connection with our annual and interim consolidated financial statements required under the laws of any other relevant jurisdiction, through Price Waterhouse & Co. S.R.L.). Our independent auditors are appointed annually for one-year terms. Following our recent corporate reorganization (see “Item 10. Additional Information – Taxation – Corporate Reorganization”), our audit committee recommended, and the annual shareholders’ meeting held on June 1, 2011 approved, that PricewaterhouseCoopers S.à r.l., Réviseur d’entreprises agréé, be appointed as independent auditors for the year ending December 31, 2011, in connection with all of our annual accounts and financial statements.

Senior Management

Our current senior management as of the date of this annual report consists of:


Name	Position	Age at December 31, 2010
Paolo Rocca	Chairman and Chief Executive Officer	58
Ricardo Soler	Chief Financial Officer	59
Renato Catallini	Supply Chain Director	44
Guillermo Moreno	Planning Director	46
Carlos Pappier	Chief Information Officer	49
Marco Radnic	Human Resources Director	61
Marcelo Ramos	Technology Director	47
Vincenzo Crapanzano	Industrial Director	58
Germán Curá	North American Area Manager	48
Sergio de la Maza	Central American Area Manager	54
Javier Martínez Alvarez	Southern Cone Area Manager	44
Alejandro Lammertyn	Eastern Hemisphere Area Manager	45
Luca Zanotti	European Area Manager	43
Guillermo Noriega	Advisor to the Chief Executive Officer	60

Ricardo Soler. Mr Soler currently serves as our chief financial officer, a position that he assumed in October 2007. Previously he served as chief executive officer of Hydril and from 1999 until November 2006 served as managing director of our welded pipe operations in South America and as executive vice-president of Confab and Siat. He started his career in the Techint group in 1973 as a planning analyst at Siderar. He served as Siderca’s financial director from 1993 until 1995. Mr. Soler is an Argentine citizen.

Renato Catallini. Mr. Catallini currently serves as our supply chain director, with responsibility for the execution of all contractual deliveries to customers. He joined Tenaris in 2001 in the supply management area, as a general manager of Exiros Argentina. In July 2002, he was appointed operations director and subsequently, in January 2005, became managing director of Exiros. Before joining Tenaris, he worked for ten years in the energy sector, working for TGN, Nova Gas Internacional, TransCanada Pipelines and TotalFinaElf, among others. He assumed his current position in August 2007. Mr. Catallini is an Argentine citizen.

Guillermo Moreno. Mr. Moreno currently serves as our planning director. Previously, he served as director of Oilfield Services business unit. He first joined Siderca in 1987 after graduating as an industrial engineer. Up to 1993 he worked in several finance and marketing positions in Siderca and was also responsible for sales in Latin America. In 1996 he became Tamsa’s exports sales director and in 1999 he became the director of the Pipeline Services business unit. He assumed his current position in May 2010. Mr. Moreno is an Argentine citizen.

Carlos Pappier. Mr. Pappier currently serves as our chief information officer. Previously, he served as planning director. He began his career within the Techint group in 1984 as a cost analyst in Siderar. After holding several positions within Tenaris and other Techint group companies in 2002, he became chief of staff of Tenaris. He assumed his current position in May 2010. Mr. Pappier is an Argentine citizen.

Marco Radnic. Mr. Radnic currently serves as our human resources director. He began his career within the Techint group in the Industrial Engineering Department of Siderar in 1975. Later he held several positions in the technical departments of Siderca and various companies within the Techint group. After holding several positions in the marketing and procurement areas in Europe, in

1996 he became commercial director of Dalmine. In 1998, he became the director of our Process and Power Services business unit. In 2001, he was appointed chief of staff for Paolo Rocca in Buenos Aires. He assumed his current position in December 2002. Mr. Radnic is an Argentine citizen.

Marcelo Ramos. Mr. Ramos currently serves as our technology director, with responsibility over technology and quality. Previously he served as quality director and managing director of NKKTubes and our Japanese operations. He joined the Techint group in 1987 and has held various positions within Tenaris including quality control director at Siderca. He assumed his current position in April 2010, when the quality and technology departments were combined. Mr. Ramos is an Argentine citizen.

Vincenzo Crapanzano. Mr. Crapanzano currently serves as our industrial director, a position he assumed in April 2011. Previously he served as our European area manager, Mexican area manager and executive vice president of Tamsa. Prior to joining Tenaris, he held various positions at Grupo Falck from 1979 to 1989. When Dalmine acquired the tubular assets of Grupo Falck in 1990, he was appointed managing director of the cold drawn tubes division. He is also vice president of Centro Sviluppo Materiali S.p.A, and of Federacciai. Mr. Crapanzano is an Italian citizen.

Germán Curá. Mr. Curá currently serves as our North American area manager. He is a marine engineer and was first employed with Siderca in 1988. Previously, he served as Siderca’s exports director, Tamsa’s exports director and commercial director, sales and marketing manager of our Middle East office, president of Algoma Tubes, director of our Oilfield Services business unit and commercial director. He is also a member of the board of directors of the American Petroleum Institute (API). He assumed his current position in October 2006. Mr. Curá is an Argentine citizen.

Sergio de la Maza. Mr. de la Maza currently serves as our Central American area manager and also serves as a director and executive vice-president of Tamsa. Previously he served as our Mexican area manager. He first joined Tamsa in 1980. From 1983 to 1988, Mr. de la Maza worked in several positions in Tamsa and Dalmine. He then became manager of Tamsa’s new pipe factory and later served as manufacturing manager and quality director of Tamsa. Subsequently, he was named manufacturing director of Siderca. He assumed his current position in 2006. Mr. de la Maza is a Mexican citizen.

Javier Martínez Alvarez. Mr. Martínez Alvarez currently serves as our Southern Cone area manager, a position he assumed in June 2010, having previously served as our Andean area manager. He began his career in the Techint group in 1990, holding several positions including planning manager of Siderar and commercial director of Ternium-Sidor. In 2006, he joined Tenaris as our Venezuela area manager. Mr Martínez Alvarez is an Argentine citizen.

Alejandro Lammertyn. Mr. Lammertyn currently serves as our Eastern Hemisphere Area Manager based in Dubai. He assumed his current position in August 2010, after a restructuring of the commercial department aimed at strengthening our regional presence in the eastern hemisphere. Mr. Lammertyn began his career with Tenaris in 1990. Previously he served as assistant to the CEO for marketing, organizational model and mill allocation matters, supply chain director and commercial director. Mr. Lammertyn is an Argentine citizen.

Luca Zanotti. Mr. Zanotti currently serves as our European area manager, a position he assumed in April 2011. He joined Tenaris in 2002 as planning and administration director in Exiros, the supply management area. He was later appointed raw materials director and in July 2007 became managing director of Exiros, a position he held until June 2010. In July 2010 he became the senior assistant to the European area manager. Before joining Tenaris, he was a senior manager at A.T. Kearney in Milan, where he worked from 1998 to 2002, and prior to that he held various business development positions in the Far East for Lovato Electric. Mr. Zanotti is an Italian citizen.

Guillermo Noriega. Mr. Noriega currently serves as advisor to the chief executive officer, supervising our Brazilian operations. Until June 1, 2010, when he assumed his current position, he served as our South American area manager and as managing director of Siderca. Previously, he served as Siderca’s commercial director for the Argentine market. He began his career at Siderca as an industrial engineer in 1981. Mr. Noriega is an Argentine citizen.

B.	Compensation

The compensation of the members of the Company’s board of directors is determined at the annual ordinary general shareholders’ meeting. Each member of the board of directors received as compensation for their services for the year 2010 a fee of $70,000. The chairman of the audit committee received as additional compensation a fee of $60,000 while the other members of the audit committee received an additional fee of $50,000. Under the Company’s articles of association, the members of the audit committee are not eligible to participate in any incentive compensation plan for employees of the Company or any of its subsidiaries.

The aggregate cash compensation received by directors and senior management for the years ended December 31, 2010, 2009 and 2008, amounted to $18.6 million, $18.2 million and $22.5 million, respectively. In addition, directors and senior management received for the years ended December 31, 2010, 2009 and 2008, 485,000, 436,000 and 488,000 units, respectively, for a total amount of $4.1 million, $3.4 million and $3.4 million, respectively, in connection with the Employee retention and long term incentive program described in note O (d) “Employee benefits –Employee retention and long term incentive program” to our audited consolidated financial statements included in this annual report.

There are no service contracts between any director and Tenaris that provide for material benefits upon termination of employment.

C.	Board Practices

See Item 6.A.“Directors, Senior Management and Employees – Directors and Senior Management – Board of Directors”.

Audit Committee

Pursuant to our articles of association, as supplemented by the audit committee’s charter, for as long as our shares are listed on at least one stock exchange, the Company must have an audit committee composed of three members, all of which must qualify as independent directors under the Company’s articles of association.

Under the Company’s articles of association, an independent director is a director who:

•

is not and has not been employed by us or our subsidiaries in an executive capacity for the preceding five years;

•

is not a person that controls us, directly or indirectly, and is not a member of the board of directors of a company controlling us, directly or indirectly;

•

does not have (and is not affiliated with a company or a firm that has) a significant business relationship with us, our subsidiaries or our controlling shareholder;

•

is not and has not been affiliated with or employed by a present or former auditor of us, our subsidiaries or our controlling shareholder for the preceding five years; and

•

is not a spouse, parent, sibling or relative up to the third degree of any of the above persons.

The Company’s board of directors has an audit committee consisting of three members. On June 1, 2011, the Company’s board of directors reappointed Jaime Serra Puche, Amadeo Vázquez y Vázquez and Roberto Monti as members of our audit committee. All three members of the audit committee qualify as independent directors under the Company’s articles of association.

Under the Company’s articles of association, the audit committee is required to report to the board of directors on its activities from time to time, and on the adequacy of the systems of internal control over financial reporting once a year at the time the annual accounts are approved. In addition, the charter of the audit committee sets forth, among other things, the audit committee’s purpose and responsibilities. The audit committee assists the board of directors in its oversight responsibilities with respect to our financial statements, and the independence, performance and fees of our independent auditors. The audit committee also performs other duties entrusted to it by the Company’s board of directors.

In addition, the audit committee is required by the Company’s articles of association to review “material transactions”, as such term is defined under the Company’s articles of association, to be entered into by the Company or its subsidiaries with “related parties”, as such term is defined in the Company’s articles of association, in order to determine whether their terms are consistent with market conditions or are otherwise fair to the Company and/or its subsidiaries. In the case of material transactions entered into by the Company’s subsidiaries with related parties, the Company’s audit committee will review those transactions entered into by those subsidiaries whose boards of directors do not have independent members. Confab is currently our only subsidiary with independent board members.

Under the Company’s articles of association, as supplemented by the audit committee’s charter, a material transaction is:

•

any transaction between the Company or its subsidiaries with related parties (x) with an individual value equal to or greater than $10 million, or (y) with an individual value lower than $10 million, when the aggregate sum – as reflected in the consolidated financial statements of the four fiscal quarters of the Company preceding the date of determination- of any series of transactions for such lower value that can be deemed to be parts of a unique or single transaction (but excluding any transactions that were reviewed and approved by the Company’s audit committee or board of directors, as applicable, or the independent members of the board of directors of any of its subsidiaries) exceeds 1.5% of the Company’s consolidated net sales made in the fiscal year preceding the year on which the determination is made;

•

any corporate reorganization transaction (including a merger, spin-off or bulk transfer of a business) affecting the Company for the benefit of, or involving, a related party; and

•

any corporate reorganization transaction (including a merger, spin-off or bulk transfer of a business) not reviewed and approved by the independent members of the board of directors of any of the Company’s direct or indirect subsidiaries, affecting any of the Company’s direct or indirect subsidiaries for the benefit of, or involving, a related party.

The audit committee has the power (to the maximum extent permitted by applicable laws) to request that the Company or relevant subsidiary provide any information necessary for it to review any material transaction. A related party transaction shall not be entered into unless (i) the circumstances underlying the proposed transaction justify that it be entered into before it can be reviewed by the Company’s audit committee or approved by the board of directors and (ii) the related party agrees to unwind the transaction if the Company’s audit committee or board of directors does not approve it.

The audit committee has the authority to conduct any investigation appropriate to fulfill its responsibilities, and has direct access to the Company’s internal and external auditors as well as to the Company’s management and employees and, subject to applicable laws, its subsidiaries.

D.	Employees

The following table shows the number of persons employed by Tenaris:


	At December 31, 2010
Argentina		7,244
Mexico		4,173
United States		3,363
Brazil		2,638
Italy		2,612
Canada		1,372
Romania		1,226
Indonesia		648
Japan		637
Other Countries		1,509

Total employees		25,422

At December 31, 2009 and December 31, 2008, the number of persons employed by Tenaris was 22,591 and 23,873 respectively.

The number of our employees increased during 2010, from 22,591 at December 2009, to 25,422 at December 2010. The increase in our workforce resulted primarily from a growing activity level as global economic conditions improved and production at our plants increased.

Approximately 55% of our employees are unionized. We believe that we enjoy good or satisfactory relations with our employees and their unions in each of the countries in which we have manufacturing facilities, and we have not experienced any major strikes or other labor conflicts with a material impact on our operations over the last five years. In some of the countries in which we have significant production facilities (e.g., Argentina and Brazil), the revaluation of local currencies against the U.S. dollar, together with inflationary pressures, negatively affect our costs, increase labor demands and could eventually generate higher levels of labor conflicts.

E.	Share Ownership

To our knowledge, the total number of the Company’s shares (in the form of ordinary shares or ADSs) beneficially owned by our directors and senior management as of May 31, 2011 was 1,417,269, which represents 0.12% of our outstanding shares.

The following table provides information regarding share ownership by our directors and senior management:


Director or Officer	Number of Shares Held
Guillermo Vogel		1,325,446
Carlos Condorelli		67,211
Guillermo Moreno		16,430
Ricardo Soler		8,182

Total		1,417,269

Item 7.

Major Shareholders and Related Party Transactions.

A.	Major Shareholders

The following table shows the beneficial ownership of the Company’s ordinary shares by (1) the Company’s major shareholders (persons or entities that have notified the Company of holdings in excess of 5% of the Company’s voting rights), (2) non-affiliated public shareholders, and (3) the Company’s directors and senior management as a group. The information below is based on the most recent information available to the Company.


Identity of Person or Group	Number		Percent
San Faustin⁽¹⁾		713,605,187		60.45	%
Aberdeen Asset Management PLC’s Fund Management Operating Subsidiaries ⁽²⁾		59,184,400		5.01	%
Capital Research and Management Company ⁽³⁾		59,047,436		5.00	%
Directors and senior management as a group		1,417,269		0.12	%
Public		347,282,538		29.42	%

Total		1,180,536,830		100.0	%

(1)

San Faustin owns all of its shares in the Company through its wholly-owned subsidiary Techint Holdings. Techint Holdings (formerly known as I.I.I. Industrial Investments Inc.) transferred its domicile from the Cayman Island to Luxembourg and San Faustin (formerly known as San Faustin N.V.) also transferred its domicile from Curacao to Luxembourg. In connection with San Faustin’s 2011 redomiciliation from Curacao to Luxembourg, San Faustin’s controlling entity Rocca & Partners S.A. organized the Dutch private foundation (Stichting) RP STAK. RP STAK holds shares in San Faustin sufficient in number to control San Faustin. No person or group of persons controls RP STAK.

(2)

On April 27, 2011 Aberdeen Asset Management PLC's Fund Management Operating Subsidiaries informed the Company, pursuant to the Luxembourg Transparency Law, that as of April 26, 2011, it was deemed to be the beneficial owner of 59,184,400 ordinary shares of the Company, par value U.S.$ 1.00 per share, representing 5.01% of the Company’s issued and outstanding capital and votes.

(3)

On November 15, 2010, Capital Research and Management Company informed the Company, pursuant to the Luxembourg Transparency Law, that as of November 12, 2010, it was deemed to be the beneficial owner of 59,047,436 ordinary shares of the Company, par value U.S.$ 1.00 per share, representing 5.00% of the Company’s issued and outstanding capital and votes.

As of May 31, 2011, 140,504,845 ADSs (representing 281,009,690 Shares, or 23.8% of all issued and outstanding Shares of the Company) were registered in the name of approximately 445 holders resident in the United States.

The voting rights of the Company’s major shareholders do not differ from the voting rights of other shareholders. None of its outstanding shares have any special control rights. There are no restrictions on voting rights, nor are there, to the Company’s knowledge, any agreements among shareholders of the Company that might result in restrictions on the transfer of securities or the exercise of voting rights.

The Company does not know of any significant agreements or other arrangements to which the Company is a party and which take effect, alter or terminate in the event of a change of control of the Company. The Company does not know of any arrangements, the operation of which may at a subsequent date result in a change of control of the Company.

B.	Related Party Transactions

Tenaris is a party to several related party transactions as described below. Material related party transactions are subject to the review of the audit committee of the Company’s board of directors and the requirements of Luxembourg law. For further details on the approval process for related party transactions, see Item 6.C. “Directors, Senior Management and Employees – Board Practices – Audit Committee”.

Purchases of Steel Products and Raw Materials

In the ordinary course of business, we purchase flat steel products, steel bars and other raw materials from Ternium or its subsidiaries. These purchases are made on similar terms and conditions as sales made by these companies to unrelated third parties. These transactions include:

•

Purchases of flat steel products for use in the production of welded pipes and accessories, which amounted to $126.5 million, $24.7 million and $101.7 million in 2010, 2009 and 2008, respectively.

•

Purchases of steel bars for use in our seamless steel pipe operations in Venezuela, which amounted to $4.6 million in the first quarter of 2008 (thereafter Sidor ceased to be a related party).

•

Purchases of pig iron, DRI, scrap and other raw materials for use in the production of seamless pipes, which amounted to $19.8 million, $8.9 million and $17.0 million in 2010, 2009 and 2008 , respectively.

•

Purchases of metal building components for our new rolling mill in Mexico, which amounted to $18.5 million in 2010 and $4.4 million in 2009.

Sales of Raw Materials

In the ordinary course of business, we sell raw materials and other production inputs to Ternium or its subsidiaries. These sales are made on similar terms and conditions as purchases made by these companies from unrelated third parties. These transactions include:

•

Sales of ferrous scrap, and other raw materials, which amounted to $29.5 million, $14.2 million, and $29.1 million in 2010, 2009 and 2008 respectively.

•

Sales of steam and operational services from our Argentine electric power generating facility in San Nicolás. These sales amounted to $14.1 million, $13.5 million and $21.8 million in 2010, 2009 and 2008 respectively. In 2008, sales included a compensation charge amounting to $11.0 million, for increased costs in previous periods.

Purchase Agency Services

Exiros, in which we have a 50% share ownership and Ternium has the remaining 50% share ownership, provides our subsidiaries with purchase agency services in connection with our purchases of raw materials and other products or services. In connection with Exiros’ services, Tenaris paid fees amounting to $33.9 million, $30.3 million and $33.3 million in 2010, 2009 and 2008, respectively.

Supply of Natural Gas

We are party to contracts with Tecpetrol, TGN and Litoral Gas relating to the supply of natural gas to our operations in Argentina. Tecpetrol, a company controlled by San Faustin, is engaged in oil and gas exploration and production and has rights to various oil and gas fields in Argentina and elsewhere in America. TGN operates two major pipelines in Argentina connecting the major gas basins of Neuquén and Noroeste-Bolivia to the major consumption centers in Argentina, while Litoral Gas distributes gas in the Province of Santa Fe and in the northeastern section of the Province of Buenos Aires. San Faustin holds significant but non-controlling interests in TGN and Litoral Gas.

Tecpetrol supplies Siderca with natural gas requirements under market conditions and according to local regulations. Tecpetrol’s sales to Tenaris amounted to $12.2 million, $5.5 million and $8.2 million in 2010, 2009 and 2008, respectively.

TGN charges Siderca a price to transport its natural gas supplies that is equivalent on a comparable basis to prices paid by other industrial users. The Argentine government regulates the general framework under which TGN operates and prices its services. TGN’s sales to Tenaris amounted to $1.2 million, $1.1 million and $6.4 million in 2010, 2009 and 2008, respectively.

Litoral Gas’s sales to Tenaris totaled $2.5 million, $2.7 million and $3.0 million in 2010, 2009 and 2008, respectively.

During 2008, in order to fulfill our gas consumption requirements, we also purchased gas on spot conditions from Tecgas and Energy Consulting Services S.A, two companies controlled by San Faustin. These purchases amounted to $0.3 million.

Provision of Engineering and Labor Services

We contract with certain companies controlled by San Faustin engineering and non-specialist manual labor services, such as cleaning, general maintenance, handling of by-products and construction services. Fees accrued for these services in the aggregate amounted to $127.7 million, $64.3 million and $58.5 million in 2010, 2009 and 2008, respectively. In 2008, in order to create our own engineering

services company, we paid $3.5 million as fees for technical advice to companies controlled by San Faustin.

Sales of Steel Pipes and Sucker Rods

In the ordinary course of business, we sell steel pipes, sucker rods and related services to other companies controlled by San Faustin. These sales, which are made principally to companies involved in the construction of gas pipelines and to Tecpetrol and joint ventures in which Tecpetrol participates, for its oil and gas drilling operations, are made on similar terms and conditions as sales to unrelated third parties. Our sales of steel pipes and sucker rods as well as logistical and certain other services to other companies controlled by San Faustin amounted to $105.8 million , $76.7 million and $58.9 million in 2010, 2009 and 2008, respectively.

Sales of Other Products and Services

In addition to sales of pipes and sucker rods, we enter into sales transactions with companies controlled by San Faustin for the sale of other products and services. Within them:

•

We provide technology and information services to companies controlled by San Faustin. Sales of these services amounted to $4.3 million , $4.0 million and $4.2 million in 2010, 2009 and 2008, respectively.

•

We provide administrative services to Exiros and other related parties. Sales of these services amounted to $2.3 million, $2.6 million and $2.8 million in 2010, 2009 and 2008, respectively.

Financial Operations and Administrative Services

Finma S.A., a company controlled by San Faustin in which we have a 33% share ownership and other affiliates of San Faustin have the remaining share ownership, provides administrative and legal support services to San Faustin’s affiliates in Argentina, including us. Fees accrued for these services amounted to $10.8 million, $11.2 million and $10.3 million in 2010, 2009 and 2008, respectively.

Transactions involving Matesi prior to June 30, 2009

We established Matesi jointly with Sidor, a related party until April 2008, to operate an HBI production facility in Venezuela. We own 50.2% of Matesi and Sidor owns the remaining 49.8%. In May 2009, the Venezuelan government announced the nationalization of Matesi. For more information on the Matesi nationalization process, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

As of June 30, 2009, the Company ceased consolidating Matesi’s results and other financial data and classified its investment in Matesi as an available-for-sale financial asset, with Matesi’s results and cash flows during each period prior to June 30, 2009 being presented as discontinued operations. Accordingly, transactions between Matesi and related parties for periods prior to the de-consolidation of Matesi are shown below:

•

The sale of HBI to Sidor pursuant to an off-take agreement, which amounted to $7.9 million in the first quarter of 2008.

•

During 2004, Matesi entered into a management assistance agreement with Sidor. As part of this agreement, Matesi paid fees to Sidor totaling $0.1 million in the first quarter of 2008, related to the provision of managerial services.

•

As part of the investment agreement to finance the acquisition of Matesi’s assets and its start-up, in July 2004 Matesi received loans from its shareholders, Sidor and a subsidiary of the Company, in the same proportion as their participations and under the same terms and conditions. In May 2007, the board of directors of Matesi approved the partial capitalization of the loan granted by Sidor for an amount of $34.9 million. Interest paid on this loan amounted to $0.5 million in the first quarter of 2008.

•

Matesi paid royalties and technical assistance fees in respect of licensed technology to Hylsamex, a subsidiary of Ternium. The royalties and fees paid to Hylsamex amounted to $0.5 million in 2008.

•

During 2007, Matesi entered into a service agreement with Sidor under which Matesi recycled pellets from Sidor into HBI. Under this agreement, Sidor paid to Matesi $4.5 million in the first quarter of 2008.

•

Matesi purchased supplies and spare parts from HyL Technologies S.A. de C.V., or HyL, a Mexican company controlled by San Faustín, involved in marketing and implementation of direct reduction plants. Matesi payed to HyL $1.5 million in 2009 and $1.0 million in 2008.

Other Transactions

We contracted pipe coating services from Socotherm Brasil S.A. (an associated company in which we hold 50% of the share capital), for an amount of $17.3 million, $46.3 million and $79.6 million in 2010, 2009 and 2008, respectively.

We purchased welded steel pipes from Ternium, amounting to $4.5 million, $1.9 million and $0.5 million in 2010, 2009 and 2008, respectively, which were sold by Tamsa as part of major projects.

During 2010, we entered into a contract with Tenova S.pA., a company controlled by San Faustin, for the provision of furnaces for our facility in Dalmine. Supplies received amounted to $14.7 million in 2010.

In addition, in the ordinary course of business, from time to time, we carry out other transactions and enter into other arrangements with other related parties, none of which are believed to be material.

C.	Interest of Experts and Counsel

Not applicable.

Item 8.

Financial Information

A.	Consolidated Statements and Other Financial Information

See Item 18 and pages F-1 through F-60 for our audited consolidated financial statements.

Legal Proceedings

Tenaris is involved in litigation arising from time to time in the ordinary course of business. Based on management’s assessment it is not anticipated that the ultimate resolution of pending litigation will result in amounts in excess of recorded provisions that would be material to Tenaris’s consolidated financial condition, results of operations or cash flows.

Outstanding Legal Proceedings

The following legal proceedings were outstanding as of the date of this report:

Conversion of tax loss carry-forwards

On December 18, 2000, the Argentine tax authorities notified Siderca, a subsidiary of the Company, of an income tax assessment related to the conversion of tax loss carry-forwards into Debt Consolidation Bonds under Argentine Law No. 24.073. The adjustments proposed by the tax authorities represent an estimated contingency of ARS 99.3 million (approximately $24.6 million) at March 31, 2011, in taxes and penalties. Based on the views of Siderca’s tax advisors, we believe that it is not probable that the ultimate resolution of the matter will result in an obligation. Accordingly, no provision was recorded in our audited consolidated financial statements.

Settlement with U.S. Governmental Authorities

The Company learned from one of its customers in Central Asia that certain sales agency payments made by one of the Company’s subsidiaries may have improperly benefited employees of the customer and other persons. The Audit Committee of the Company’s Board of Directors engaged external counsel in connection with a review of these payments and related matters. The Company voluntarily notified the SEC and the DOJ, and shared the results of the review with these agencies. On May 17, 2011, Tenaris settled the SEC’s and the DOJ’s FCPA investigations. For further information regarding these settlements, see Item 5.G. “Operating and Financial Review and Prospects -Recent Developments – Settlement with U.S. governmental authorities”.

Other proceedings

We are also involved in legal proceedings incidental to the normal conduct of our business, for which we have made provisions in accordance with our corporate policy and any applicable rules. We believe that our provisions are adequate. Based on the information currently available to us, we do not believe that the outcomes of these proceedings are likely to be, individually or in the aggregate, material to our consolidated financial condition, results of operations or cash flows.

Previously Reported Legal Proceedings

The following previously reported legal proceedings were terminated, settled or otherwise disposed of during the year covered by this report or during 2011 through the date of this annual report:

Maverick litigation

On November 22, 2006, Maverick received a letter from The Bank of New York as trustee, or the Trustee, for the holders of 2004 4% Convertible Senior Subordinated Notes due 2033 issued by Maverick, or the 2004 Notes, concerning an alleged breach of the indenture entered into on December 30, 2004, between Maverick and the Trustee, and governing the 2004 Notes, or the Indenture. The alleged breach of the Indenture was based on Maverick’s refusal to grant the holders of the 2004 Notes conversion rights provided by the “Public Acquirer Change of Control” provision of the Indenture. On December 11, 2006, the Trustee filed a complaint against Maverick and the Company in the U.S. District Court for the Southern District of New York. The complaint alleged that the Company’s acquisition of Maverick triggered the “Public Acquirer Change of Control” provision and asserted a breach of contract claim against Maverick for refusing to accept the 2004 Notes for conversion for the consideration specified in the “Public Acquirer Change of Control” provision. The complaint also sought a declaratory judgment that the Company’s acquisition of Maverick was a “Public Acquirer Change of Control” under the Indenture, and therefore triggered the above mentioned conversion rights, and asserts claims for tortious interference with contract and unjust enrichment against the Company. Defendants filed a motion to dismiss the complaint, or in the alternative, for summary judgment on March 13, 2007. Plaintiff filed a motion for partial summary judgment on the same date. On January 25, 2008, Law Debenture Trust Company of New York (as successor to The Bank of New York as trustee under the Indenture) was substituted for The Bank of New York as plaintiff.

On October 15, 2008, the court denied Law Debenture’s motion for partial summary judgment and granted defendants’ motion for summary judgment dismissing the complaint in its entirety. On November 20, 2008, Law Debenture filed a notice of appeal in the U.S. Court of Appeals for the Second Circuit and on February 19, 2010, the U.S. Court of Appeals for the Second Circuit affirmed the District Court’s judgment. Time for Plaintiff’s appeal filing has expired.

IRS Audit of U.S. federal income tax returns

In 2009 and 2010, the U.S. Internal Revenue Service, or IRS, conducted a field examination of Maverick’s 2005 and 2006 U.S. federal income tax returns. In connection with such field examination, the IRS issued several Notices of Proposed Adjustment (NOPAs), seeking to disallow, in full or in part, certain interest expense deductions taken in 2005 and 2006 of $1.0 million and

$87.3 million, respectively, and to assess interest on any resulting underpayment of income tax. This matter was settled in May 2010, with no material impact on our results.

Dividend Policy

The Company does not have, and has no current plans to establish, a formal dividend policy governing the amount and payment of dividends. The amount and payment of dividends has to be determined by a majority vote of shareholders, generally, but not necessarily, based on the recommendation of the Company’s board of directors. The Company’s controlling shareholder has the discretion to determine the amount and payment of future dividends. All Shares of the Company’s share capital rank pari passu with respect to the payment of dividends.

The following table shows the dividends approved by the Company’s shareholders since 2007:

Shareholders’ meeting date

Approved dividend

Dividend payment date

Amount
(USD million)

Per share
(USD)

Per ADS
(USD)

Interim Dividend

Dividend
Balance

June 6, 2007

354

0.30

0.60

June 2007

June 4, 2008

449

0.38

0.76

November 2007

June 2008

June 3, 2009

507

0.43

0.86

November 2008

June 2009

June 2, 2010

401

0.34

0.68

November 2009

June 2010

June 1, 2011

401

0.34

0.68

November 2010

June 2011

The Company conducts and will continue to conduct its operations through subsidiaries and, accordingly, its main source of cash to pay dividends, among other possible sources, will be the dividends received from its subsidiaries. See Item 3.D. “Key Information – Risk Factors – Risks Relating to the Structure of the Company – As a holding company, the Company’s ability to pay cash dividends depends on the results of operations and financial condition of our subsidiaries and could be restricted by legal, contractual or other limitations”. The Company’s ability to pay cash dividends depends on the results of operations and the financial condition of its subsidiaries and may be restricted by legal, contractual or other limitations.

Dividends may be lawfully declared and paid if the Company’s profits and distributable reserves are sufficient under Luxembourg law. The board of directors has the power to initiate dividend installments pursuant to Luxembourg law, but payment of the dividends must be approved by the Company’s shareholders at the annual shareholders’ meeting, subject to the approval of the Company’s annual accounts.

Under Luxembourg law, at least 5% of the Company’s net profits per year must be allocated to the creation of a legal reserve until such reserve has reached an amount equal to 10% of our share capital. If the legal reserve later falls below the 10% threshold, at least 5% of net profits again must be allocated toward the reserve. The legal reserve is not available for distribution. At December 31, 2010, the Company’s legal reserve represented 10% of its share capital.

B.	Significant Changes

Except as otherwise disclosed in this annual report, there has been no undisclosed significant change since the date of the annual consolidated financial statements.

Item 9.

The Offer and Listing

A.	Offer and Listing Details

The Shares are listed on the Buenos Aires Stock Exchange and on the Mexican Stock Exchange and its ADSs are listed on the NYSE under the symbol “TS”. The Shares are also listed on the Italian Stock Exchange under the symbol “TEN”. Trading on the NYSE, the Buenos Aires Stock Exchange and the Mexican Stock Exchange began on December 16, 2002, and trading on the Italian Stock Exchange began on December 17, 2002.

As of May 31, 2011, a total of 1,180,536,830 Shares were registered in the Company’s shareholder register. As of May 31, 2011, a total of 281,009,690 Shares were registered in the name of the depositary for the Company’s ADR program. On May 31, 2011, the closing sale price for the ADSs on the NYSE was $48.69, the closing sale price of the Shares on the Italian Stock Exchange was €16.84 and on the Buenos Aires Stock Exchange was ARS106.70. On May 26, 2011, the closing sale price of the Shares on the Mexico Stock Exchange was MXP275.00

New York Stock Exchange

As of May 31, 2011, a total of 140,504,845 ADSs were registered of record. Each ADS represents two Shares of the Company’s share capital. Since February 28, 2008, The Bank of New York Mellon has acted as the Company’s depositary for issuing ADSs evidencing Shares, as successor depositary agent to JP Morgan Chase. Fluctuations between the Euro and the U.S. dollar will affect the U.S. dollar equivalent of the price of the Shares on the Italian Stock Exchange and the price of the ADSs on the NYSE. Fluctuations between the Argentine peso and the U.S. dollar will affect the U.S. dollar equivalent of the price of the Shares on the Buenos Aires Stock Exchange and the price of the ADSs on the NYSE. Fluctuations between the Mexican peso and the U.S. dollar will affect the U.S. dollar equivalent of the price of the Shares on the Mexico Stock Exchange and the price of the ADSs on the NYSE.

The following table sets forth, for the periods indicated, the high and low quoted prices for the ADSs as reported by NYSE (Source: Bloomberg LP).


	Price per ADS
2006	High		Low
Full year		51.02		24.42

	Price per ADS
2007	High		Low
Full year		54.75		41.48

	Price per ADS
2008	High		Low
Full year		74.50		15.39

	Price per ADS
2009	High		Low
First quarter		24.29		15.10
Second quarter		32.28		20.50
Third quarter		36.53		24.63
Fourth quarter		42.93		33.51
Full year		42.93		15.10

	Price per ADS
2010	High		Low
First quarter		47.41		41.43
Second quarter		45.43		34.35
Third quarter		41.62		33.50
Fourth quarter		49.09		37.99
Full year		49.09		33.50

	Price per ADS
Last Six Months	High		Low
December 2010		49.09		44.26
January 2011		49.31		45.24
February 2011		48.33		44.31
March 2011		49.46		43.37
April 2011		50.79		47.85
May 2011		50.14		46.41

Italian Stock Exchange

The following table sets forth, for the periods indicated, the high and low quoted prices for the Shares (in Euros per share), traded on the Italian Stock Exchange (Source: Bloomberg LP).


	Price per Share
2006	High		Low
Full year		19.63		10.03

	Price per Share
2007	High		Low
Full year		19.29		14.96

	Price per Share
2008	High		Low
Full year		23.33		6.34

	Price per Share
2009	High		Low
First quarter		8.87		5.97
Second quarter		11.29		7.66
Third quarter		12.49		8.69
Fourth quarter		15.04		11.41
Full year		15.04		5.97

	Price per Share
2010	High		Low
First quarter		17.27		14.97
Second quarter		16.82		13.77
Third quarter		15.74		13.04
Fourth quarter		18.65		13.80
Full year		18.65		13.04

	Price per Share
Last Six Months	High		Low
December 2010		18.65		16.75
January 2011		18.51		16.62
February 2011		17.62		16.34
March 2011		17.33		15.70
April 2011		17.68		16.68
May 2011		17.21		16.00

The Italian Stock Exchange, managed by Borsa Italiana, S.p.A., was founded in 1997 following the privatization of the exchange and became operational on January 2, 1998. Borsa Italiana is now part of the London Stock Exchange Group, following the agreement signed in June 2007.

Borsa Italiana S.p.A. organizes and manages the Italian Stock Exchange with the participation of nearly 130 domestic and international brokers who operate in Italy or from abroad through remote membership, using a completely electronic trading system for the real-time execution of trades. Blue-chip securities shall be traded using the auction and continuous trading method from 8:00 A.M. to 5:35 P.M. each business day.

Buenos Aires Stock Exchange

The following table sets forth, for the periods indicated, the high and low quoted prices for the Shares (in nominal Argentine pesos per share), traded on the Buenos Aires Stock Exchange (Source: Bloomberg LP).


	Price per Share
2006	High		Low
Full year		75.60		36.45

	Price per Share
2007	High		Low
Full year		86.45		63.70

	Price per Share
2008	High		Low
Full year		117.86		27.49

	Price per Share
2009	High		Low
First quarter		42.08		28.47
Second quarter		61.70		39.45
Third quarter		69.30		47.69
Fourth quarter		80.70		64.39
Full year		80.70		28.47

	Price per Share
2010	High		Low
First quarter		91.91		80.53
Second quarter		87.29		68.80
Third quarter		81.02		65.86
Fourth quarter		98.60		74.76
Full year		98.60		65.86

	Price per Share
Last Six Months	High		Low
December 2010		98.60		88.70
January 2011		99.10		92.65
February 2011		100.40		93.60
March 2011		104.20		91.30
April 2011		108.00		101.60
May 2011		107.20		100.80

The Buenos Aires Stock Market, which is affiliated with the Buenos Aires Stock Exchange, is the largest stock market in Argentina. The Buenos Aires Stock Market is a corporation whose approximately 130 shareholder members are the only individuals and entities authorized to trade in securities listed on the Buenos Aires Stock Exchange. Trading on the Buenos Aires Stock Exchange is conducted electronically or by continuous open outcry from 11:00 A.M. to 5:00 P.M. each business day.

Although the Buenos Aires Stock Exchange is one of Latin America’s largest securities exchanges in terms of market capitalization, it remains relatively small and illiquid compared to major world markets and, therefore, subject to greater volatility.

Mexican Stock Exchange

The following table sets forth, for the periods indicated, the high and low quoted prices for the Shares (in nominal Mexican pesos per share), traded on the Mexican Stock Exchange (Source: Bloomberg LP).


	Price per Share
2006	High		Low
Full year		276.50		130.31

	Price per Share
2007	High		Low
Full year		295.00		233.00


	Price per Share
2008	High		Low
Full year		349.72		105.36

	Price per Share
2009	High		Low
First quarter		161.90		122.44
Second quarter		212.31		143.06
Third quarter		243.11		170.39
Fourth quarter		281.77		228.52
Full year		281.77		122.44

	Price per Share
2010	High		Low
First quarter		298.25		263.15
Second quarter		264.56		220.12
Third quarter		258.64		218.82
Fourth quarter		305.00		249.09
Full year		305.00		218.82

	Price per Share
Last Six Months	High		Low
December 2010		305.00		272.00
January 2011		303.44		275.39
February 2011		288.02		270.00
March 2011		294.00		271.00
April 2011		298.00		279.72
May 2011		290.93		275.00

The Mexican Stock Exchange is the only stock exchange in Mexico. Trading on the Mexican Stock Exchange is conducted electronically from 8:30 A.M. to 3:00 P.M. each business day.

Although the Mexican Stock Exchange is one of Latin America’s largest securities exchanges in terms of market capitalization, it remains relatively small and illiquid compared to major world markets and, therefore, subject to greater volatility.

B.	Plan of Distribution

Not applicable.

C.	Markets

See Item 9.A.“The Offer and Listing—Offer and Listing Details”.

D.	Selling Shareholders

Not applicable.

E.	Dilution

Not applicable.

F.	Expenses of the Issue

Not applicable.

Item 10.

Additional Information

A.	Share Capital

Not applicable.

B.	Memorandum and Articles of Association

General

The following is a summary of certain rights of holders of Shares. These rights are set out in the Company’s articles of association or are provided by applicable Luxembourg law, and may differ from those typically provided to shareholders of U.S. companies under the corporation laws of some states of the United States. This summary is not exhaustive and does not contain all information that may be important to you. For more complete information, you should read the Company’s articles of association, which is an exhibit to this annual report.

The Company is a public limited liability company (société anonyme) organized under the laws of Luxembourg. Its object and purpose, as set forth in Article 2 of its articles of association, is the taking of interests, in any form, in corporations or other business entities, and the administration, management, control and development thereof. The Company is registered under the number B85 203 in the Registre du Commerce et des Sociétés.

The Company has an authorized share capital of a single class of 2,500,000,000 Shares with a par value of $1.00 per share upon issue. The authorized share capital is fixed by the Company’s articles of association as amended from time to time with the approval of shareholders on an extraordinary shareholders’ meeting. The extraordinary general meeting of shareholders held on June 6, 2007 renewed the validity of the Company’s authorized share capital until August 2, 2012. As of May 31, 2011, there were 1,180,536,830 Shares issued. All issued Shares are fully paid.

The Company’s articles of association authorize the board of directors to increase the issued share capital in whole or in part from time to time, through issues of shares within the limits of the authorized share capital against compensation in cash, compensation in kind at a price or if shares are issued by way of incorporation of reserves, at an amount, which shall not be less than the par value and may include such issue premium as the board of directors shall decide. The extraordinary general meeting of shareholders held on June 6, 2007, renewed this authority until August 2, 2012. Under the Company’s articles of association, any issuance of new Shares pursuant to the authorization granted to its board of directors must grant its existing shareholders a preferential right to subscribe for such newly-issued Shares, except:

•

in circumstances in which the Shares are issued for consideration other than money;

•

with respect to Shares issued as compensation to directors, officers, agents or employees, its subsidiaries or affiliates; and

•

with respect to Shares issued to satisfy conversion or option rights created to provide compensation to directors, officers, agents or employees, its subsidiaries or affiliates.

Any Shares to be issued as compensation or to satisfy conversion or option rights may not exceed 1.5% of the Company’s issued capital.

Amendment of the Company’s articles of association requires the approval of shareholders at an extraordinary shareholders’ meeting with a two-thirds majority of the votes present or represented.

Dividends

Subject to applicable law, all Shares (including Shares underlying ADSs) are entitled to participate equally in dividends when, as and if declared by the shareholders at the ordinary general shareholders’ meeting, out of funds legally available for such purposes. Under Luxembourg law, claims for dividends will lapse five years after the date such dividends are declared. However, we may elect to pay

a declared dividend after such period. Shareholders may, at the ordinary general shareholders’ meeting, which every shareholder has the right to attend in person or by proxy, declare a dividend under Article 21 of the Company’s articles of association.

Under Article 21 of the articles of association, the board of directors has the power to distribute interim dividends in accordance with the conditions that apply to commercial companies set forth in particular in Section 72-2 of the Luxembourg Companies Law.

Pursuant to Luxembourg law, at least 5% of our net profits per year must be allocated to the creation of a legal reserve until such reserve has reached an amount equal to 10% of our issued share capital. If the legal reserve later falls below the 10% threshold, at least 5% (or such lower amount required to reach the 10% threshold) of net profits again must be allocated toward the reserve. The Company’s legal reserve represented 10% of its share capital as of December 31, 2010. The legal reserve is not available for distribution.

Voting Rights; Shareholders’ Meetings; Election of Directors

Each Share entitles the holder to one vote at the Company’s general shareholders’ meetings. Shareholder action by written consent is not permitted, but proxy voting is permitted. Notices of general shareholders’ meetings are governed by the provisions of Luxembourg law and the Company’s articles of association. Notices of such meetings must be published twice, at least at a ten-day interval, the second notice appearing at least 10 days prior to the meeting, in the Luxembourg Official Gazette and in a leading newspaper having general circulation in Luxembourg. If an extraordinary general shareholders’ meeting is adjourned for lack of a quorum, notices must be published twice, in the Luxembourg Official Gazette and two Luxembourg newspapers, at a twenty-day interval, the second notice appearing at least 20 days prior to the meeting. In case Shares are listed on a foreign regulated market, notices of general shareholders’ meetings shall also be published in accordance with the publicity requirements of such regulated market. No attendance quorum is required at ordinary general shareholders’ meetings, and resolutions are adopted by a simple majority vote of the Shares present or represented and voted at the meeting. An extraordinary general shareholders’ meeting must have a quorum of at least 50% of the issued share capital. If a quorum is not reached, such meeting may be reconvened at a later date with no quorum requirements by means of the appropriate notification procedures provided for by the Luxembourg Companies Law. In both cases, the Luxembourg Companies Law and the Company’s articles of association require that any resolution of an extraordinary general shareholders’ meeting be adopted by a two-thirds majority votes of the Shares present or represented. If a proposed resolution consists of changing the Company’s nationality or of increasing the shareholders’ commitments, the unanimous consent of all shareholders is required. Directors are elected at ordinary general shareholders’ meetings. Cumulative voting is not permitted. The Company’s articles of association do not provide for staggered terms and directors are elected for a maximum of one year and may be reappointed or removed at any time, with or without cause, by resolution passed by a simple majority vote of the Shares present or represented and voted. In the case of a vacancy occurring in the Board of Directors, the remaining directors shall have the right to temporarily fill such vacancy by the affirmative vote of a majority of the remaining directors. The term of a temporary director elected to fill a vacancy shall expire at the end of the term of office of the replaced director; provided however that the next shareholder’s meeting shall be called upon to proceed with the definitive election of any temporary member of the Board of Directors so elected.

The Company’s annual ordinary general shareholders’ meeting shall take place in Luxembourg, on the first Wednesday of every May at 11:00 A.M., Luxembourg time. If that day is a legal or banking holiday in Luxembourg, the meeting shall be held on the following business day.

Any shareholder holding a Share on the fifth calendar day preceding the applicable general shareholders’ meeting (the “Record Date”) shall be admitted to such general shareholders’ meeting. Those shareholders who have sold their Shares between the Record Date and the date of the general shareholders’ meeting, may not attend or be represented at the meeting.

In the case of Shares held through fungible securities accounts, each shareholder may exercise all rights attached to his Shares and, in particular, may participate in and vote at shareholders’ meetings of the Company upon presentation of a certificate issued by the financial institution or professional depositary holding the Shares, certifying the number of Shares recorded in the relevant account

on the Record Date. Such certificates must be filed at least five days before the meeting with the Company at its registered address or at the address stated in the convening notice or, in case the Shares of the Company are listed on a regulated market, with an agent of the Company located in the country of the listing and designated in the convening notice. In case any such holder wishes to vote by proxy, the holder shall have to present a completed proxy, by the same date and time and at the same addresses. The board of directors and the shareholders’ meeting may, if they deem so advisable, reduce these periods of time for all shareholders and admit all shareholders (or their proxies) who have filed the appropriate documents to the general shareholders’ meeting, irrespective of these time limits.

Access to Corporate Records

Luxembourg law and the Company’s articles of association do not generally provide for shareholder access to corporate records. Shareholders may inspect the annual accounts and auditors’ reports at our registered office during the fifteen day period prior to a general shareholders’ meeting.

Appraisal Rights

In the event the Company’s shareholders approve:

•

the delisting of the Shares from all stock exchanges where the Shares are listed at that time,

•

a merger in which the Company is not the surviving entity (unless the Shares or other equity securities of such entity are listed on the New York or London stock exchanges),

•

a sale, lease, exchange or other disposition of all or substantially all of the Company’s assets,

•

an amendment of our articles of association that has the effect of materially changing the Company’s corporate purpose,

•

the relocation of the Company’s domicile outside of the Grand Duchy of Luxembourg, or

•

amendments to the Company’s articles of association that restrict the rights of the Company’s shareholders;

dissenting or absent shareholders have the right to have their Shares repurchased by the Company at (i) the average market value of the Shares over the 90 calendar days preceding the applicable shareholders’ meeting or (ii) in the event that the Shares are not traded on a regulated market, the amount that results from applying the proportion of the Company’s equity that the Shares being sold represent over the Company’s net worth as of the date of the applicable shareholders’ meeting.

Dissenting or absent shareholders must present their claim within one month following the date of the shareholders’ meeting and supply the Company with evidence of their shareholding at the time of such meeting. The Company must (to the extent permitted by applicable laws and regulations and in compliance therewith) repurchase its Shares within six months following the date of the shareholders’ meeting.

If delisting from one or more, but not all, of the stock exchanges where the Shares are listed is approved in the shareholders’ meeting, only dissenting or absent shareholders with Shares held through participants in the local clearing system for that market or markets can exercise this appraisal right if:

•

they held the Shares as of the date of the announcement by the Company of its intention to delist or as of the date of publication of the first convening notice for the general shareholders’ meeting that approved the delisting; and

•

they present their claim within one month following the date of the general shareholders’ meeting and supply evidence of their shareholding as of the date of the Company’s announcement or the publication of the first convening notice to the meeting.

In the event a shareholder exercises its appraisal rights, applicable Luxembourg law provisions shall apply.

Holders of ADSs may not be able to exercise, or may encounter difficulties in the exercise of, certain rights afforded to shareholders, including appraisal rights. See Item 3.D. “Key Information – Risk Factors – Risks Relating to Shares and ADSs – Holders of ADSs may not be able to exercise, or may encounter difficulties in the exercise of, certain rights afforded to shareholders”.

Distribution of Assets on Winding-up

In the event of the Company’s liquidation, dissolution or winding-up, the net assets remaining after allowing for the payment of all debts and expenses will be paid out to the holders of the Shares in proportion to their respective holdings.

Transferability and Form

The Company’s articles of association do not contain any redemption or sinking fund provisions, nor do they impose any restrictions on the transfer of Shares. The Shares are issuable in registered form only.

The ownership of registered Shares is evidenced by the inscription of the name of the shareholder, the number of Shares held by him and the amount paid on each share in the Company’s shareholders’ register. In addition, the Company’s articles of association provide that the Shares may be held through fungible securities accounts with financial institutions or other professional depositaries. Shares held through fungible securities accounts have the same rights and obligations as Shares recorded in the Company’s shareholders’ register.

Shares held through fungible securities accounts may be transferred in accordance with customary procedures for the transfer of securities in book-entry form. Shares that are not held through fungible securities accounts may be transferred by a written statement of transfer signed by both the transferor and the transferee or their respective duly appointed attorney-in-fact and recorded in the Company’s shareholders’ register. The transfer of Shares may also be made in accordance with the provisions of Article 1690 of the Luxembourg Civil Code. As evidence of the transfer of registered Shares, the Company may accept any correspondence or other documents evidencing the agreement between transferor and transferee as to the transfer of registered Shares.

BNP Paribas Securities Service (Luxembourg branch) maintains the Company’s shareholders’ register.

Repurchase of Company Shares

The Company may repurchase its own Shares in the cases and subject to the conditions set by the Luxembourg Companies Law and, in the case of acquisitions of Shares or ADSs made through a stock exchange in which Shares or ADSs are traded, with any applicable laws and regulations of such market. Please see Item 16.E “Purchase of Equity Securities by the Issuer and Affiliated Purchases” for more information on the authorization granted by the annual general meeting of shareholders to the Company or its subsidiaries to repurchase Shares of the Company, including Shares represented by ADSs.

Limitation on Securities Ownership

There are no limitations currently imposed by Luxembourg law or the articles of association on the rights of the Company’s non-resident or foreign shareholders to hold or vote their Shares.

Change in Control

None of our outstanding securities has any special control rights. The Company’s articles of association do not contain any provision that would have the effect of delaying, deferring or preventing a change in control of the Company and that would operate only with respect to a merger, acquisition or corporate restructuring involving the Company. In addition, the Company does not know of any significant agreements or other arrangements to which the Company is a party which take effect, alter or terminate in the event of a change of control of the Company.

There are no agreements between the Company and members of its board of directors or employees providing for compensation if they resign or are made redundant without reason, or if their employment ceases pursuant to a takeover bid.

There are no rights associated with the Shares other than those described above.

Ownership Disclosure

The Company’s articles of association do not contain any provision requiring disclosure of share ownership. However, under the Luxembourg Transparency Law investors in the Company’s securities should notify the Company and the Luxembourg securities commission on an ongoing basis whenever the proportion of voting rights held or controlled by any such investor reaches, exceeds or falls below any of the following thresholds: 5%, 10%, 15%, 20%, 25%, 33.33%, 50% and 66.66%.

C.	Material Contracts

For a summary of any material contract entered into by us outside the ordinary course of business during the last two years, see Item 4.B. “Information on the Company – Business Overview”.

D.	Exchange Controls

Many of the countries which are important markets for us or in which we have substantial assets have histories of substantial government intervention in currency markets, volatile exchange rates and government-imposed currency controls. These include Argentina, Brazil, Indonesia, Mexico, Nigeria and Romania. Argentina has exchange controls or limitations on capital flows, including requirements for the repatriation of export proceeds, in place.

Argentina

Since 2002, the Argentine government has maintained a “dirty” float of the peso. In addition, following the enactment of the Public Emergency and Foreign Exchange System Reform Law No. 25,562 in January 2002, several rules and regulations have been introduced to reduce volatility in the ARS/US$ exchange rate. Below is a summary of the principal limitations on the transfer of foreign currency in and out of Argentina:

•

the proceeds of certain foreign financial debt incurred by Argentine residents (including private Argentine entities) as well as certain inflows for the purpose of investments in the capital markets must remain in Argentina for at least 365 calendar days and require posting a non-transferable, non-remunerated deposit denominated in U.S. dollars for an amount equal to 30% of the underlying transaction. This deposit shall be held for a period of 365 calendar days and may not be used as collateral in any credit transaction;

•

outflows from proceeds of investments in capital markets are restricted and subject to certain requirements, such as, in certain cases, the mantainance of the investment for a specific period of time;

•

inflows and outflows of foreign currency through the local exchange market, and indebtedness transactions by local residents that may result in a foreign currency payment to non-residents, must be registered with the Argentine Central Bank; and

•

funds from export revenues or financial loans received that are credited in foreign currency overseas must be converted into local currency and credited to a local banking account within a specific period of time.

Regulations issued by the Argentine Central Bank establish specific exceptions pursuant to which some of these requirements may not apply to foreign trade, export finance-related transactions and certain medium term financial loans (subject to compliance with certain requirements), nor to the primary placement of publicly traded securities listed in one or more regulated markets.

Increasingly during 2008 and into 2009, the Argentine government has been imposing new restrictions on foreign exchange outflows, including through certain transactions on securities traded locally. Also, in October 2008, the time periods for the repatriation of export revenues credited in foreign currency overseas were, in practice, substantially shortened.

The market exchange rate of the Argentine peso against the U.S. dollar continues to be determined by the forces of supply and demand in the foreign exchange market, although the Argentine government, acting through the Argentine Central Bank, has a number of means by which it may act to maintain exchange rate stability. During 2010, the Argentine Central Bank maintained the value of the U.S. dollar between ARS3.8 and ARS4.0 per U.S. dollar.

E.	Taxation

The following discussion of the material Luxembourg and United States federal income tax consequences of an investment in our ADSs is based upon laws and relevant interpretations thereof in effect as of the date of this annual report, all of which are subject to change. This discussion does not address all possible tax consequences relating to an investment in our ADSs, such as the tax consequences under United States state and local tax laws.

Grand Duchy of Luxembourg

This section describes the material Luxembourg tax consequences of owning or disposing of ADSs.

You should consult your own tax advisor regarding the Luxembourg tax consequences of owning and disposing of Shares or ADSs in your particular circumstances.

As used herein, a “Luxembourg individual” means an individual resident in Luxembourg who is subject to personal income tax (impôt sur le revenu) on his or her worldwide income from Luxembourg or foreign sources, and a “Luxembourg corporate holder” means a company (that is, a fully taxable collectivité within the meaning of Article 159 of the Luxembourg Income Tax Law) resident in Luxembourg subject to corporate income tax (impôt sur le revenu des collectivités) on its worldwide income from Luxembourg or foreign sources. For purposes of this summary, Luxembourg individuals and Luxembourg corporate holders are collectively referred to as “Luxembourg Holders”. A “non-Luxembourg Holder” means any investor in Shares or ADSs of the Company other than a Luxembourg Holder.

Corporate Reorganization

Tenaris S.A. was established as a public limited liability company (société anonyme) under Luxembourg’s 1929 holding company regime. Until termination of such regime on December 31, 2010, holding companies incorporated under the 1929 regime (including the Company) were exempt from Luxembourg corporate income tax and Luxembourg withholding tax over dividends distributed to shareholders.

On January 1, 2011, the Company became an ordinary public limited liability company (société anonyme) and, effective as from that date, the Company is subject to all applicable Luxembourg taxes, (including, among others, corporate income tax on its worldwide income), and its dividend distributions will generally be subject to Luxembourg withholding tax. However, dividends received by the Company from subsidiaries in high income tax jurisdictions, as defined under Luxembourg law, will continue to be exempt from corporate income tax in Luxembourg under Luxembourg’s participation exemption.

In light of the impending termination of Luxembourg’s 1929 holding company regime, in the fourth quarter of 2010, the Company carried out a multi-step corporate reorganization, which included, among other transactions, the contribution of most of the Company’s assets and liabilities to a wholly-owned, newly-incorporated Luxembourg subsidiary and the restructuring of indirect holdings in certain subsidiaries. The first phase of the corporate reorganization was completed in December 2010, and resulted in a revaluation of the accounting value (under Luxembourg GAAP) of the Company’s assets. The second phase of the reorganization is expected to be completed in 2011.

Following the completion of the first phase of the corporate reorganization, and upon its conversion into an ordinary Luxembourg holding company, the Company recorded a special reserve for tax purposes in a significant amount. The Company expects that, as a result of its corporate reorganization, its current overall tax burden will not increase, as all or substantially all of its dividend income will come from high income tax jurisdictions. In addition, the Company expects that dividend distributions for the foreseeable future will be imputed to the special reserve and therefore should be exempt from Luxembourg withholding tax under current Luxembourg law.

Tax regime applicable to realized capital gains

Luxembourg Holders

Luxembourg resident individual holders

Capital gains realized by Luxembourg resident individuals who do not hold their Shares or ADSs as part of a commercial or industrial business and who hold no more than 10% of the share capital of the Company will only be taxable if they are realized on a sale of Shares or ADSs that takes place before their acquisition or within the first six months following their acquisition.

If such Shares or ADSs are held as part of a commercial or industrial business, capital gains would be taxable in the same manner as income from such business.

Capital gains realized by Luxembourg resident individuals holding (together with his/her spouse and underage children) directly or indirectly more than 10% of the capital of the Company will be taxable at a special rate, regardless of the holding period.

Luxembourg resident corporate holders

Capital gains realized upon the disposal of Shares or ADSs by a fully taxable resident corporate holder will in principle be subject to corporate income tax and municipal business tax. The combined applicable rate (including an unemployment fund contribution) is 28.80% for the fiscal year ending 2011 for a corporate holder established in Luxembourg-City. An exemption from such taxes may be available to the holder pursuant to article 166 of the Luxembourg Income Tax law subject to the fulfillment of the conditions set forth therein. The scope of the capital gains exemption can be limited in the cases provided by the Grand Ducal Decree of December 21, 2001.

Non-Luxembourg Holders

An individual who is a non-Luxembourg Holder of Share or ADSs (and who does not have a permanent establishment, a permanent representative or a fixed place of business in Luxembourg) will only be subject to Luxembourg taxation on capital gains arising upon disposal of such Shares or ADSs if such holder has (together with his or her spouse and underage children) directly or indirectly held more than 10% of the capital of the Company at any time during the past five years, and either (i) such holder has been a resident of Luxembourg for tax purposes for at least 15 years and has become a non-resident within the last five years preceding the realization of the gain, subject to any applicable tax treaty, or (ii) the disposal of the Shares or ADSs occurs within six months from their acquisition (or prior to their actual acquisition), subject to any applicable tax treaty.

A corporate non-Luxembourg Holder (that is, a collectivité within the meaning of Article 159 of the Luxembourg Income Tax Law), which has a permanent establishment, a permanent representative or a fixed place of business in Luxembourg to which Shares or ADSs are attributable, will bear corporate income tax and municipal business tax on a gain realized on a disposal of such Shares or ADSs as set forth above for a Luxembourg corporate holder. However, gains realized on the sale of the Shares or ADSs may benefit from the full exemption provided for by Article 166 of the Luxembourg Income Tax Law and by the Grand Ducal Decree of December 21, 2001 subject in each case to fulfillment of the conditions set out therein.

A corporate non-Luxembourg Holder, which has no permanent establishment in Luxembourg to which the Shares or ADSs are attributable, will bear corporate income tax on a gain realized on a disposal of such Shares or ADSs under the same conditions applicable to an individual non-Luxembourg Holder, as set out above.

Tax regime applicable to distributions

Withholding tax

Distributions imputed for tax purposes to newly accumulated profits of the Company (on an unconsolidated basis) are subject to a withholding tax of 15%. The rate of the withholding tax may be reduced pursuant to double tax avoidance treaty existing between Luxembourg and the country of residence of the relevant holder, subject to the fulfillment of the conditions set forth therein.

No withholding tax applies if the distribution is made to (i) a Luxembourg resident corporate holder (that is, a fully taxable collectivité within the meaning of Article 159 of the Luxembourg Income Tax Law), (ii) an undertaking of collective character which is resident of a Member State of the European Union and is referred to by article 2 of the Council Directive of 23rd July, 1990 concerning the common fiscal regime applicable to parent and subsidiary companies of different member states (90/435/EEC), (iii) a corporation or a cooperative company resident in Norway, Iceland or Liechtenstein and subject to a tax comparable to corporate income tax as provided by the Luxembourg Income Tax Law, (iv) a company resident in Switzerland which is subject to corporate income tax in Switzerland without benefiting from an exemption, (iv) an undertaking with a collective character subject to a tax comparable to corporate income tax as provided by the Luxembourg Income Tax Law which is resident in a country that has concluded a tax treaty with Luxembourg and (v) a Luxembourg permanent establishment of one of the above-mentioned categories, provided each time that at the date of payment, the holder holds directly or through a tax transparent vehicle, during an uninterrupted period of at least twelve months, Shares or ADSs representing at least 10% of the share capital of the Company or acquired for an acquisition price of at least EUR 1,200,000.

Following the completion of a corporate reorganization, and upon its conversion into an ordinary Luxembourg holding company, the Company recorded a special reserve for tax purposes in a significant amount. The Company expects that dividend distributions for the foreseeable future will be imputed to the special reserve and therefore should be exempt from Luxembourg withholding tax under current Luxembourg law. See Item 10.E. “Additional Information – Taxation –Corporate Reorganization”.

Luxembourg Holders

With the exception of a Luxembourg corporate holders benefitting from the exemption referred to above, Luxembourg individual holders, and Luxembourg corporate holders subject to Luxembourg corporation taxes, must include the distributions paid on the Shares or ADSs in their taxable income, 50% of the amount of such dividends being exempted from tax. The applicable withholding tax can, under certain conditions, entitle the relevant Luxembourg Holder to a tax credit.

Net wealth tax

Luxembourg Holders

Luxembourg net wealth tax will not be levied on a Luxembourg Holder with respect to the Share or ADSs held unless (i) the Luxembourg Holder is a legal entity subject to net wealth tax in Luxembourg; or (ii) the Share or ADSs are attributable to an enterprise or part thereof which is carried on through a permanent establishment, a fixed place of business or a permanent representative in Luxembourg.

Net wealth tax is levied annually at the rate of 0.5% on the net wealth of enterprises resident in Luxembourg, as determined for net wealth tax purposes. The Shares or ADSs may be exempt from net wealth tax subject to the conditions set forth by Paragraph 60 of the Law of October 16, 1934 on the valuation of assets (Bewertungsgesetz), as amended.

Non-Luxembourg Holders

Luxembourg net wealth tax will not be levied on a non-Luxembourg Holder with respect to the Shares or ADSs held unless the Shares or ADSs are attributable to an enterprise or part thereof which is carried on through a permanent establishment or a permanent representative in Luxembourg.

Stamp and registration taxes

No registration tax or stamp duty will be payable by a holder of Shares or ADSs in Luxembourg solely upon the disposal of Shares or ADSs by sale or exchange.

Estate and gift taxes

No estate or inheritance tax is levied on the transfer of Shares or ADSs upon the death of a holder of Shares or ADSs in cases where the deceased was not a resident of Luxembourg for inheritance tax purposes and no gift tax is levied upon a gift of Shares or ADSs if the gift is not passed before a Luxembourg notary or recorded in a deed registered in Luxembourg.

Where a holder of Shares or ADSs is a resident of Luxembourg for tax purposes at the time of his death, the Shares or ADSs are included in its taxable estate for inheritance tax or estate tax purposes.

United States federal income taxation

This section describes the material U.S. federal income tax consequences of owning Shares or ADSs. It applies to you only if you hold your Shares or ADSs as capital assets for tax purposes. This section does not apply to you if you are a member of a special class of holders subject to special rules, including:

•

a dealer in securities,

•

a bank,

•

a trader in securities that elects to use a mark-to-market method of accounting for securities holdings,

•

a tax-exempt organization,

•

a person who invests through a pass-through entity, including a partnership,

•

a life insurance company,

•

a person liable for alternative minimum tax,

•

a former citizen of long-term resident of the United States,

•

a person that actually or constructively owns 10% or more of our voting stock (including ADSs),

•

a person that holds Shares or ADSs as part of a straddle or a hedging or conversion transaction, or

•

a U.S. holder (as defined below) whose functional currency is not the U.S. dollar.

This section is based on the Internal Revenue Code of 1986, as amended, its legislative history, existing and proposed regulations, published rulings and court decisions all as currently in effect. These laws are subject to change, possibly on a retroactive basis. In

addition, this section is based in part upon the representations of the Depositary and the assumption that each obligation in the deposit agreement and any related agreement will be performed in accordance with its terms.

If a partnership holds the Shares or ADSs, the U.S. federal income tax treatment of a partner will generally depend upon the status of the partner and the activities of the partnership. Each such partner holding the Shares or ADSs is urged to consult his, her or its own tax advisor.

You are a U.S. holder if you are a beneficial owner of Shares or ADSs and you are, for U.S. federal income tax purposes:

•

an individual citizen or resident of the United States,

•

a domestic corporation,

•

an estate whose income is subject to U.S. federal income tax regardless of its source, or

•

a trust if (i) a U.S. court can exercise primary supervision over the trust’s administration and one or more U.S. persons are authorized to control all substantial decisions of the trust or (ii) the trust has a valid election in effect under applicable U.S. Treasury regulations to be treated as a U.S. person.

You should consult your own tax advisor regarding the U.S. federal, state and local and other tax consequences of owning and disposing of Shares or ADSs in your particular circumstances.

This discussion addresses only U.S. federal income taxation.

In general, and taking into account the earlier assumptions, for U.S. federal income tax purposes, if you hold ADRs evidencing ADSs, you will be treated as the owner of the Shares represented by those ADRs. Exchanges of Shares for ADRs, and ADRs for Shares, generally will not be subject to U.S. federal income tax.

Taxation of dividends

U.S. Holders. Under the U.S. federal income tax laws, and subject to the passive foreign investment company, or PFIC, rules discussed below, if you are a U.S. holder, the gross amount of any distribution we pay out of our current or accumulated earnings and profits (as determined for U.S. federal income tax purposes) is subject to U.S. federal income taxation or dividend income. If you are a noncorporate U.S. holder, dividends paid to you in taxable years beginning before January 1, 2013 that constitute qualified dividend income will be taxable to you at a maximum tax rate of 15% provided that you hold Shares or ADSs for more than 60 days during the 121-day period beginning 60 days before the ex-dividend date and meet other holding period requirements. Dividends we pay with respect to the Shares or ADSs generally will be qualified dividend income but there can be no assurance in this regard.

You must generally include any Luxembourg tax withheld from the dividend payment in this gross amount even though you do not in fact receive it. The dividend is taxable to you when you receive the dividend, actually or constructively. The dividend will not be eligible for the dividends-received deduction generally allowed to U.S. corporations in respect of dividends received from other U.S. corporations. Distributions in excess of current and accumulated earnings and profits, as determined for U.S. federal income tax purposes, will be treated as a non-taxable return of capital to the extent of your basis in the Shares or ADSs and thereafter as capital gain. However, we do not expect to keep earnings and profits in accordance with U.S. federal income tax principles. Therefore, you should expect that a distribution will generally be treated as a dividend (as discussed above).

The amount of any dividend paid in foreign currency will equal the U.S. dollar value of the foreign currency received calculated by reference to the exchange rate in effect on the date the dividend is received by you, regardless of whether the foreign currency is converted into U.S. dollars. If the foreign currency received as a dividend is converted into U.S. dollars on the date of receipt, you generally will not be required to recognize foreign currency gain or loss in respect of the dividend income. If the foreign currency received as a dividend is not converted into U.S. dollars on the date of receipt, you will have a basis in the foreign currency equal

to its U.S. dollar value on the date of receipt. Any gain or loss realized on a subsequent conversion or other disposition of the foreign currency will generally be treated as ordinary income or loss from sources within the United States.

For foreign tax credit purposes, dividends will be income from sources outside the United States and will generally constitute “passive category income” for purposes of computing the foreign tax credit. In certain circumstances, if you have held Shares or ADSs for less than a specified minimum period during which you are not protected from risk of loss, or are obligated to make payments related to the dividends, you will not be allowed a foreign tax credit for foreign taxes imposed on dividends that we pay.

Special rules apply in determining the foreign tax credit limitation with respect to dividends that are subject to the maximum 15% tax rate. To the extent a refund of the tax withheld is available to you under Luxembourg law or under any applicable treaty, the amount of tax withheld that is refundable will not be eligible for credit against your U.S. federal income tax liability. The rules governing the foreign tax credit are complex. You are urged to consult your tax advisors regarding the availability of the foreign tax credit under your particular circumstances.

Taxation of capital gains

U.S. Holders Subject to the PFIC rules discussed below, if you are a U.S. holder and you sell or otherwise dispose of your Shares or ADSs, you will recognize capital gain or loss for U.S. federal income tax purposes equal to the difference between the U.S. dollar value of the amount that you realize and your tax basis, determined in U.S. dollars, in your Shares or ADSs. Capital gain of a noncorporate U.S. holder is generally taxed at preferential rates where the property is held for more than one year. The gain or loss will generally be income or loss from sources within the United States for foreign tax credit limitation purposes.

Additional U.S. Federal Income Tax Considerations

PFIC rules. Based on the Company’s expected income and assets, the Shares or ADSs should not be treated as stock of a PFIC for U.S. federal income tax purposes, but this conclusion is a factual determination that is made annually and thus may be subject to change. If we were to be treated as a PFIC, unless a U.S. holder is permitted to elect and does elect to be taxed annually on a mark-to-market basis with respect to the Shares or ADSs, gain realized on the sale or other disposition of your Shares or ADSs would in general not be treated as capital gain. Instead, if you are a U.S. holder, you would be treated as if you had realized such gain and certain “excess distributions” ratably over your holding period for the Shares or ADSs and would be taxed at the highest tax rate in effect for each such year to which the gain was allocated, together with an interest charge in respect of the tax attributable to each such year. With certain exceptions, your Shares or ADSs will be treated as stock in a PFIC if we were a PFIC at any time during your holding period in your Shares or ADSs. Dividends that you receive from us and that are not treated as excess distributions will not be eligible for the special tax rates applicable to qualified dividend income if we are treated as a PFIC with respect to you either in the taxable year of the distribution or the preceding taxable year, but instead will be taxable at rates applicable to ordinary income.

F.	Dividends and Paying Agents

Not applicable.

G.	Statement by Experts

Not applicable.

H.	Documents on Display

The Company is required to file annual and special reports and other information with the SEC. You may read and copy any documents filed by the Company at the SEC’s public reference room at 100 F Street, N.E., Room 1580 Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information on the public reference room. The SEC also maintains an Internet website at http://www.sec.gov which contains reports and other information regarding registrants that file electronically with the SEC.

The Company is subject to the reporting requirements of the U.S. Securities Exchange Act of 1934, as amended, or the Exchange Act, as applied to foreign private issuers. Because the Company is a foreign private issuer, the SEC’s rules do not require it to deliver proxy statements or to file quarterly reports. In addition, the Company’s “insiders” are not subject to the SEC’s rules that prohibit short-swing trading. We prepare quarterly and annual reports containing consolidated financial statements. The Company’s annual consolidated financial statements are certified by an independent accounting firm. The Company submits quarterly financial information with the SEC on Form 6-K simultaneously with or promptly following the publication of that information in Luxembourg or any other jurisdiction in which the Company’s securities are listed, and the Company files annual reports on Form 20-F within the time period required by the SEC, which is currently six months from the close of the fiscal year on December 31, and will be shortened to four months for annual reports on financial statements ending on or after 2011. These quarterly and annual reports may be reviewed at the SEC’s public reference room. Reports and other information filed electronically with the SEC are also available at the SEC’s Internet website.

As a foreign private issuer under the Securities Act, the Company is not subject to the proxy rules of Section 14 of the Exchange Act or the insider short-swing profit reporting requirements of Section 16 of the Exchange Act.

The Company has appointed The Bank of New York Mellon to act as depositary for its ADSs. During the time there continue to be ADSs deposited with the Depositary, it will furnish the Depositary with:

•

its annual reports, and

•

summaries of all notices of shareholders’ meetings and other reports and communications that are made generally available to the Company’s shareholders.

The Depositary will, as provided in the deposit agreement, arrange for the mailing of summaries in English of the reports and communications to all record holders of ADSs. Any record holder of ADSs may read the reports, notices or summaries thereof, and communications at the Depositary’s office located at 101 Barclay Street, New York, New York 10286.

Whenever a reference is made in this annual report to a contract or other document, please be aware that such reference is not necessarily complete and that you should refer to the exhibits that are a part of this annual report for a copy of the contract or other document. You may review a copy of the annual report at the SEC’s public reference room in Washington, D.C.

I.	Subsidiary Information

Not applicable.

Item 11.

Quantitative and Qualitative Disclosure about Market Risk

The multinational nature of our operations and customer base expose us to a variety of risks, including the effects of changes in foreign currency exchange rates, interest rates and commodity prices. In order to reduce the impact related to these exposures, management evaluates exposures on a consolidated basis to take advantage of natural exposure netting. For the residual exposures, we may enter into various derivative transactions in order to reduce potential adverse effects on our financial performance. Such derivative transactions are executed in accordance with internal policies in areas such as counterparty exposure and hedging practices. We do not enter into derivative financial instruments for trading or other speculative purposes, other than non-material investments in structured products.

The following information should be read together with section 3, “Financial risk management” to our audited consolidated financial statements included elsewhere in this annual report.

Debt Structure

The following tables provide a breakdown of our debt instruments at December 31, 2010 and 2009 which included fixed and variable interest rate obligations, detailed by currency and maturity date:


At December 31, 2010	Expected maturity date
	2011		2012		2013		2014		2015		Thereafter		Total⁽¹⁾
	(in thousands of U.S. dollars)
Non-current Debt
Fixed rate		—		56,017		806		540		414		153		57,930
Floating rate		—		98,210		32,397		7,459		7,459		17,115		162,640

Current Debt
Fixed rate		583,808		—		—		—		—		—		583,808
Floating rate		440,118		—		—		—		—		—		440,118

		1,023,926		154,227		33,203		7,999		7,873		17,268		1,244,496


At December 31, 2009	Expected maturity date
	2010		2011		2012		2013		2014		Thereafter		Total⁽¹⁾
	(in thousands of U.S. dollars)
Non-current Debt
Fixed rate		—		—		51,959		—		—		—		51,959
Floating rate		—		390,962		134,749		32,700		7,579		37,232		603,222

Current Debt
Fixed rate		239,694		—		—		—		—		—		239,694
Floating rate		551,889		—		—		—		—		—		551,889

		791,583		390,962		186,708		32,700		7,579		37,232		1,446,764

(1)	As most borrowings are based on short-term fixed rates, or floating rates that approximate market rates, with interest rate resetting every 3 to 6 months, the fair value of the borrowings approximates its carrying amount and is not disclosed separately.

Our financial liabilities (other than trade payables and derivative financial instruments) consist mainly of bank loans. As of December 31, 2010 U.S. dollar denominated financial debt plus other currencies denominated financial debt swapped to the U.S. dollar represented 90% of total financial debt. For further information about our financial debt, please see note 20 “Borrowings” to our audited consolidated financial statements included in this annual report.

Interest Rate Risk

Fluctuations in market interest rates create a degree of risk by affecting the amount of our interest payments and the value of our fixed rate debt. At December 31, 2010, we had variable interest rate debt of $602.8 million and fixed rate debt of $641.7 million. This risk is to a great extent mitigated by our investment portfolio.

In addition, we have entered into certain interest rate derivatives instruments in order to minimize the volatility effect of floating rates on future interest rate payments related to long-term debt. In such derivatives, we agree to exchange with the counterparty, at specified intervals, the difference between fixed and variable interest amounts calculated by reference to an agreed-upon notional amount.

Interest Rate Coverage

At December 31, 2010 and 2009, we had variable interest rate swaps with knock-in provisions according to the following schedule:


*Thousands of U.S. dollars*
Type of derivative	Reference rate		Average rate (fixed or floor-cap)			Expiry		Notional amount		Fair value at December 31, 2010
Pay fixed/Receive variable with knock-in at 2.50%		Libor 6M		4.91	%		2011		350,000		(5,359	)

											(5,359	)


*Thousands of U.S. dollars*
Type of derivative	Reference rate		Average rate (fixed or floor-cap)			Expiry		Notional amount		Fair value at December 31, 2009
Pay fixed / Receive variable		Euribor 6M		5.72	%		2010		911		(22	)
Pay fixed/Receive variable with knock-in at 2.50%		Libor 6M		4.91	%		2011		350,000		(17,716	)

											(17,738	)

Foreign Exchange Rate Risk

We manufacture our products in a number of countries and sell them through a number of companies located throughout the world and as a result we are exposed to foreign exchange rate risk. Since the Company’s functional currency is the U.S. dollar, the purpose of our foreign currency hedging program is mainly to reduce the risk caused by changes in the exchange rates of other currencies against the U.S. dollar.

Our exposure to currency fluctuations is reviewed on a periodic basis. A number of hedging transactions are performed in order to achieve an efficient coverage. Almost all of these hedging transactions are forward exchange rate contracts.

Because a number of subsidiaries have functional currencies other than the U.S. dollar, the results of hedging activities as reported in the income statement under IFRS may not fully reflect management’s assessment of its foreign exchange risk hedging needs. Also, intercompany balances between our subsidiaries may generate exchange rate results to the extent that their functional currencies differ.

The value of our financial assets and liabilities is subject to changes arising out of the variation of foreign currency exchange rates. The following table provides a breakdown of our main financial assets and liabilities (including foreign exchange derivative contracts) exposed to foreign exchange risk as of December 31, 2010.


(all amounts in thousands of U.S. dollars)	Exposure
U.S. dollars / Brazilian real		304,229
Mexican Pesos / U.S. dollars		177,227
U.S. dollars / Euros		(113,836	)
Argentine Pesos / U.S. dollars		(74,440	)
Canadian dollars / U.S. dollars		(68,195	)

The main relevant exposures correspond to:

U.S. dollars / Brazilian real

Consists primarily of Cash and cash equivalent and Other investments denominated in U.S. dollar at subsidiaries which functional currency is the Brazilian real.

Mexican pesos / U.S. dollars

Consists primarily of various foreign exchange derivative contracts entered to preserve the U.S. dollar value of borrowings denominated in Mexican peso, partially offset by Cash and cash equivalents and sales denominated in U.S. dollar at subsidiaries which functional currency is the Mexican peso.

U.S. dollars / Euros

Foreign Currency Derivative Contracts

At December 31, 2010 and 2009, Tenaris was party to foreign currency forward agreements as detailed below.


*Thousands of U.S. dollars*
Currencies	Contract	Contract Amount		Average contractual exchange rate		Term		Fair value at December 31, 2010
US$/ARS	Argentine Peso Forward purchases		369,846		4.3421		2011		24,819
US$/MXN	Mexican Peso Forward purchase / sales		220,235		12.8340		2011		1,451
US$/JPY	Japanese Yen Forward purchases		50,021		83,1982		2011		1,043
CAD/US$	Canadian Dollar Forward sales		62,438		1.0215		2011		(1,563	)
KWD/US$	Kuwaiti Dinar Forward sales		55,482		0.2905		2011		(1,732	)
BRL/US$	Brazilian Real Forward sales		32,156		1.8040		2011		(2,087	)
Others			—		—		—		(285	)

US$ / CAD	Canadian Dollar Forward Purchases (Embedded into purchase contract)		227,596		1.0314		2017		3,278

									24,924


*Thousands of U.S. dollars*
Currencies	Contract	Contract Amount		Average contractual exchange rate		Term		Fair value at December 31, 2009
US$/ARS	Argentine Peso Forward purchases		269,833		4.1924		2010		13,601
US$/EUR	Euro Forward purchases		68,885		1.4154		2010		1,186
Others			—		—		2010		(1,348	)
US$ / CAD	Canadian Dollar Forward Purchases (Embedded into purchase contract)		275,794		1.0342		2017		(2,818	)

									10.621

Accounting for Derivative Financial Instruments and Hedging Activities

Derivative financial instruments are classified as financial assets (or liabilities) at fair value through profit or loss. Their fair value is calculated using standard pricing techniques and, as a general rule, we recognize the full amount related to the change in its fair value under financial results in the current period.

We designate for hedge accounting certain derivatives hedging particular financial liabilities or highly probable forecast transactions. These instruments are classified as cash flow hedges. The effective portion of the fair value of such derivatives is accumulated in a reserve account in equity. Amounts accumulated in equity are discharged to the income statement in the same period than any offsetting losses and gains on the hedged item. The gain or loss relating to the ineffective portion is recognized immediately in the income statement. The fair value of our derivative financial instruments (assets or liabilities) continues to be reflected on the consolidated statement of financial position.

At December 31, 2010, the effective portion of designated cash flow hedges, included in other reserves in shareholders’ equity amounted to $8.9 million.

Concentration of credit risk

There is no significant concentration of credit from customers. No single customer comprised more than 10% of our net sales in 2010.

Our credit policies related to sales of products and services are designed to identify customers with acceptable credit history, and to allow us to use credit insurance, letters of credit and other instruments designed to minimize credit risk whenever deemed necessary. We maintain allowances for potential credit losses.

Commodity Price Sensitivity

We use commodities and raw materials that are subject to price volatility caused by supply conditions, political and economic variables and other unpredictable factors. As a consequence, we are exposed to risk resulting from fluctuations in the prices of these commodities and raw materials. Although we fix the prices of such raw materials and commodities for short-term periods, typically not in excess of one year, in general we do not hedge this risk. In the past we have occasionally used commodity derivative instruments to hedge certain fluctuations in the market prices of raw material and energy.

Item 12.

Description of Securities Other Than Equity Securities

A.	Debt securities

Not applicable.

B.	Warrants and Rights

Not applicable.

C.	Other securities

Not applicable

D.	American Depositary Shares

According to our deposit agreement, holders of ADSs may have to pay to the Depositary, either directly or indirectly, fees or charges up to the amounts set forth below:

•

A fee of USD5.00 (or less) per 100 ADSs (or portion of 100 ADSs) for: issuance of ADSs, including issuances resulting from a distribution of Shares or rights or other property; and cancellation of ADSs for the purpose of withdrawal, including if the deposit agreement terminates.

•

A fee of USD0.02 (or less) per ADSs for any cash distribution to ADS registered holders, excluding cash dividend.

•

As necessary, charges for taxes and other governmental charges the Depositary or the custodian have to pay on any ADS or Share underlying an ADS (e.g., share transfer taxes, stamp duty or withholding taxes).

•

Registration or transfer fees for transfer and registration of shares on our share register to or from the name of the Depositary or its agent when you deposit or withdraw Shares.

•

Expenses of the Depositary for cable, telex and facsimile transmissions (when expressly provided in the deposit agreement); and conversion of foreign currency.

•

A fee equivalent to the fee that would be payable if securities distributed to ADS holders had been Shares and the Shares had been deposited for issuance of ADSs for distribution of securities distributed to holders of deposited securities which are distributed by the Depositary to ADS registered holders.

•

As necessary, charges for any costs incurred by the Depositary or its agents for servicing the deposited securities.

The Depositary collects its fees for delivery and surrender of ADSs directly from investors depositing Shares or surrendering ADSs for the purpose of withdrawal or from intermediaries acting for them. The Depositary collects fees for making distributions to investors by deducting those fees from the amounts distributed or by selling a portion of distributable property to pay the fees. The Depositary may collect its annual fee for depositary services by deduction from cash distributions or by directly billing investors or by charging the book-entry system accounts of participants acting for them. The Depositary may generally refuse to provide fee-attracting services until its fees for those services are paid.

Fees payable by the Depositary to the Company

Fees incurred in 2010

For the year ended December 31, 2010, the Company received from the Depositary $2.25 million for continuing annual stock exchange listing fees, standard out-of-pocket maintenance costs for the ADSs (consisting of the expenses of postage and envelopes for mailing annual and interim financial reports, printing and distributing dividend checks, electronic filing of U.S. federal tax information, mailing required tax forms, stationery, postage, facsimile, and telephone calls), any applicable performance indicators relating to the ADS program, underwriting fees and legal fees.

Fees to be paid in the future

The Depositary has agreed to reimburse the Company for expenses it incurs that are related to establishment and maintenance expenses of the ADS program. The Depositary has agreed to reimburse the Company for its continuing annual stock exchange listing fees. The Depositary has also agreed to pay the standard out-of-pocket maintenance costs for the ADSs, which consist of the expenses of postage and envelopes for mailing financial reports, printing and distributing dividend checks, electronic filing of U.S. Federal tax information, mailing required tax forms, stationery, postage, facsimile, and telephone calls. It has also agreed to reimburse the Company annually for certain investor relationship programs or special investor relations promotional activities. There are limits on the amount of expenses for which the Depositary will reimburse the Company, but the amount of reimbursement available to the Company is not necessarily tied to the amount of fees the Depositary collects from investors.

PART II

Item 13.

Defaults, Dividend Arrearages and Delinquencies

None.

Item 14.

Material Modifications to the Rights of Security Holders and Use of Proceeds

None.

Item 15.

Controls and Procedures

Disclosure Controls and Procedures

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we have evaluated the effectiveness of the design and operation of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-5(e) under the Exchange Act) as of December 31, 2010. Based on that evaluation, our Chief Executive Officer and Chief Financial Officer have concluded that, as of December 31, 2010, our disclosure controls and procedures are effective to ensure that information required to be disclosed by us in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and to ensure that such information is accumulated and communicated to management, including our Chief Executive Officer and Chief Financial Officer, to allow timely decisions regarding required disclosure. Our disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives. Our Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures are effective at a reasonable assurance level.

Management’s report on internal control over financial reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting. Tenaris’s internal control over financial reporting was designed by management to provide reasonable assurance regarding the reliability of financial reporting and the preparation and fair presentation of its consolidated financial statements for external purposes in accordance with IFRS.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements or omissions. In addition, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management conducted its assessment of the effectiveness of Tenaris’s internal control over financial reporting based on the framework in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

Based on this assessment, management has concluded that Tenaris’s internal control over financial reporting, as of December 31, 2010, is effective to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes.

The effectiveness of Tenaris’s internal control over financial reporting as of December 31, 2010, has been audited by Price Waterhouse & Co. S.R.L., an independent registered public accounting firm, as stated in their report included herein. See “Report of Independent Registered Public Accounting Firm”.

Changes in internal control over financial reporting

During the period covered by this report, there were no changes in our internal control over financial reporting (as such term is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act) that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 16.A.

Audit Committee Financial Expert

Neither Luxembourg law nor the Company’s articles of association require that audit committee members be financially literate or acquire such financial knowledge within a reasonable period. The Company’s board of directors has determined that the audit committee members do not meet the attributes defined in Item 16A of Form 20-F for “audit committee financial experts”. However, it has concluded that the membership of the audit committee as a whole has sufficient recent and relevant financial experience to properly discharge its functions. In addition, the audit committee, from time to time and as it deems necessary, engages persons that meet all of the attributes of an “audit committee financial expert” as consultants.

Item 16.B.

Code of Ethics

In addition to the general code of conduct incorporating guidelines and standards of integrity and transparency applicable to all of our directors, officers and employees, we have adopted a code of ethics for financial officers which applies to our principal executive officer, principal financial officer, principal accounting officer or controller, or persons performing similar functions and is intended to supplement the Company’s code of conduct.

The text of our codes of conduct and code of ethics is posted on our Internet website at: http://ir.tenaris.com/codeOfConduct.cfm.

Item 16.C.

Principal Accountant Fees and Services

Fees Paid to the Company’s Principal Accountant

In 2010 and 2009 PWC served as the principal external auditor for the Company. Fees payable to PWC in 2010 and 2009 are detailed below.


	For the year ended December 31,
*Thousands of U.S. dollars*	2010		2009
Audit Fees		4,291		3,966
Audit-Related Fees		77		267
Tax Fees		161		129
All Other Fees		88		—

Total		4,617		4,362

Audit Fees

Audit fees were paid for professional services rendered by the auditors for the audit of the consolidated financial statements and internal control over financial reporting of the Company, the statutory financial statements of the Company and its subsidiaries, and any other audit services required for the SEC or other regulatory filings.

Audit-Related Fees

Audit-related fees are typically services that are reasonably related to the performance of the audit or review of the consolidated financial statements of the Company and the statutory financial statements of the Company and its subsidiaries and are not reported under the audit fee item above. This item includes fees for attestation services on financial information of the Company and its subsidiaries included in their annual reports that are filed with their respective regulators.

Tax Fees

Fees paid for tax compliance professional services.

All Other Fees

Other fees paid to PWC include fees for the support in the implementation of certain information technology systems.

Audit Committee’s Pre-approval Policies and Procedures

Under the policy, the audit committee makes its recommendations to the shareholders’ meeting concerning the continuing appointment or termination of the Company’s independent auditors. On a yearly basis, the audit committee reviews together with management and the independent auditor, the audit plan, audit related services and other non-audit services and approves the related fees. Any changes to the approved fees must be reviewed and approved by the audit committee. In addition, the audit committee delegates to its Chairman the authority to consider and approve, on behalf of the audit committee, additional non-audit services that were not recognized at the time of engagement, which must be reported to the other members of the audit committee at its next meeting. No services outside the scope of the audit committee’s approval can be undertaken by the independent auditor.

The audit committee did not approve any fees pursuant to the de minimis exception to the pre-approval requirement provided by paragraph (c)(7)(i)(C) of Rule 2-01 of Regulation S-X during 2010 or 2009.

Item 16.D.

Exemptions from the Listing Standards for Audit Committees

Not applicable.

Item 16.E.

Purchases of Equity Securities by the Issuer and Affiliated Purchasers

In 2010, to our knowledge, there were no purchases of any class of registered equity securities of the Company by the Company or any “affiliated purchaser” (as such term is defined in Rule 10b-18(a)(3) under the Exchange Act).

On June 2, 2010, the Company’s annual general shareholders meeting resolved to cancel the authorization granted to the Company and to the Company’s subsidiaries to acquire, from time to time, Shares, including shares represented by ADSs, granted by the general meeting of shareholders held on June 3, 2009, and to grant a new authorization to the Company and to the Company’s subsidiaries to purchase, acquire or receive, from time to time, securities, on the following terms and conditions:

•

Purchases, acquisitions or receptions of securities may be made in one or more transactions as the Board of Directors or the board of directors or other governing bodies of the relevant entity, as applicable, considers advisable.

100

•

The maximum number of securities acquired pursuant to this authorization may not exceed 10% of the Company’s issued and outstanding shares or, in the case of acquisitions made through a stock exchange in which the securities are traded, such lower amount as may not be exceeded pursuant to any applicable laws or regulations of such market. The number of securities acquired as a block may amount to the maximum permitted amount of purchases.

•

The purchase price per share to be paid in cash may not exceed 125% (excluding transaction costs and expenses), nor may it be lower than 75% (excluding transaction costs and expenses), in each case of the average of the closing prices of the Company’s securities in the stock exchange through which the Company’s securities are acquired, during the five trading days in which transactions in the securities were recorded in such stock exchange preceding (but excluding) the day on which the Company’s securities are acquired. For over-the-counter or off-market transactions, the purchase price per ADR to be paid in cash may not exceed 125% (excluding transaction costs and expenses), nor may it be lower than 75% (excluding transaction costs and expenses), in each case of the average of the closing prices of the ADSs in the New York Stock Exchange during the five trading days in which transactions in ADSs were recorded in the New York Stock Exchange preceding (but excluding) the day on which the ADSs are acquired; and, in the case of acquisition of securities, other than in the form of ADSs, such maximum and minimum purchase prices shall be calculated based on the number of underlying shares represented by such ADSs. Compliance with maximum and minimum purchase price requirements in any and all acquisitions made pursuant to this authorization (including, without limitation, acquisitions carried out through the use of derivative financial instruments or option strategies) shall be determined on and as of the date on which the relevant transaction is entered into, irrespective of the date on which the transaction is to be settled.

•

The above maximum and minimum purchase prices shall, in the event of a change in the par value of the shares, a capital increase by means of a capitalization of reserves, a distribution of shares under compensation or similar programs, a stock split or reverse stock split, a distribution of reserves or any other assets, the redemption of capital, or any other transaction impacting on the Company’s equity be adapted automatically, so that the impact of any such transaction on the value of the shares shall be reflected.

•

The acquisitions of securities may not have the effect of reducing the Company’s net assets below the sum of the Company’s capital stock plus its undistributable reserves.

•

Only fully paid-up securities may be acquired pursuant to this authorization.

•

The acquisitions of securities may be carried out for any purpose, as may be permitted under applicable laws and regulations, including without limitation to reduce the share capital of the Company, to offer such shares to third parties in the context of corporate mergers or acquisitions of other entities or participating interests therein, for distribution to the Company’s or the Company’s subsidiaries’ directors, officers or employees or to meet obligations arising from convertible debt instruments.

•

The acquisitions of securities may be carried out by any and all means, as may be permitted under applicable laws and regulations, including through any stock exchange in which the Company’s securities are traded, through public offers to all shareholders of the Company to buy securities, through the use of derivative financial instruments or option strategies, or in over the counter or off-market transactions or in any other manner.

•

The acquisitions of securities may be carried out at any time, during the duration of the authorization, including during a tender offer period, as may be permitted under applicable laws and regulations.

•

The authorization granted to acquire securities shall be valid for such maximum period as may be provided for under applicable Luxembourg law as in effect from time to time (such maximum period being, as of to date, 5 years).

•

The acquisitions of securities shall be made at such times and on such other terms and conditions as may be determined by the Board of Directors or the board of directors or other governing bodies of the relevant entity, provided that, any such purchase

101

shall comply with Article 49-2 et. seq. of the Luxembourg law of August 10, 1915 on commercial companies (or any successor law) and, in the case of acquisitions of securities made through a stock exchange in which the Company’s securities are traded, with any applicable laws and regulations of such market.

In the future, we may, on the terms and subject to the conditions above referred, initiate a stock repurchase or similar program or engage in other transactions pursuant to which we would repurchase, directly or indirectly, the Company’s securities. In addition, we or our subsidiaries may enter into transactions involving sales or purchases of derivatives or other instruments, either settled in cash or through physical delivery of securities, with returns linked to the Company’s securities. The timing and amount of repurchase transactions under any such program, or sales or purchases of derivatives or other instruments, would depend on market conditions as well as other corporate and regulatory considerations.

Item 16.F.

Change in Registrant’s Certifying Accountant

Our independent auditors for the fiscal year ended December 31, 2010 were PWC (acting, in connection with our annual accounts and annual consolidated financial statements required under Luxembourg law, through PricewaterhouseCoopers S.à r.l., Réviseur d’entreprises agréé, and in connection with our annual and interim consolidated financial statements required under the laws of any other relevant jurisdiction, through Price Waterhouse & Co. S.R.L.). Our independent auditors are appointed annually for one-year terms. Following our recent corporate reorganization (see “Item 10. Additional Information – Taxation – Corporate Reorganization”), our audit committee recommended, and the annual shareholders’ meeting approved at a meeting held on June 1, 2011, that PricewaterhouseCoopers S.à r.l., Réviseur d’entreprises agréé, be appointed as independent auditors for the year ending December 31, 2011, in connection with all of our annual accounts and financial statements.

Item 16.G.

Corporate Governance

The Company’s corporate governance practices are governed by Luxembourg Law (including among others, the law of August 10, 1915 on commercial companies and the law of January 11, 2008, implementing the European Union’s transparency directive) and the Company’s articles of association. As a Luxembourg company listed on the New York Stock Exchange (the NYSE), the Bolsa Mexicana de Valores, S.A. de C.V. (the Mexican Stock Exchange), the Bolsa de Comercio de Buenos Aires (the Buenos Aires Stock Exchange) and Borsa Italiana S.p.A. (the Italian Stock Exchange), the Company is required to comply with some, but not all, of the corporate governance standards of these exchanges. The Company, however, believe that the Company’s corporate governance practices meet, in all material respects, the corporate governance standards that are generally required for controlled companies by all of the exchanges on which the Company’s securities trade.

The following is a summary of the significant ways that the Company’s corporate governance practices differ from the corporate governance standards required for controlled companies by the exchanges on which our securities trade. The Company’s corporate governance practices may differ in non-material ways from the standards required by these exchanges that are not detailed here.

Non-management directors’ meetings.

Under NYSE standards, non-management directors must meet at regularly scheduled executive sessions without management present and, if such group includes directors who are not independent, a meeting should be scheduled once per year including only independent directors. Neither Luxembourg law nor the Company’s articles of association require the holding of such meetings and the Company does not have a set policy for these meetings. For additional information on board meetings, see Item 6.A. “Directors, Senior Management and Employees– Directors and Senior Management – Board of Directors”.

In addition, NYSE-listed companies are required to provide a method for interested parties to communicate directly with the non-management directors as a group. While the Company does not have such a method, it has set up a compliance line for investors and other interested parties to communicate their concerns directly to the members of our audit committee.

102

Audit committee.

Under NYSE standards, listed U.S. companies are required to have an audit committee composed of independent directors that satisfies the requirements of Rule 10A-3 promulgated under the Exchange Act. The Company’s articles of association currently require to have an audit committee composed of three members, of which at least two must be independent (as defined in the articles of association) and the Company’s audit committee complies with such requirements. In accordance with NYSE standards, the Company has an audit committee entirely composed of independent directors. For more information on the Company’s audit committee see Item 6.C. “Directors, Senior Management and Employees– Board Practices – Audit Committee”.

Under NYSE standards, all audit committee members of listed U.S. companies are required to be financially literate or must acquire such financial knowledge within a reasonable period and at least one of its members shall have experience in accounting or financial administration. In addition, if a member of the audit committee is simultaneously a member of the audit committee of more than three public companies, and the listed company does not limit the number of audit committees on which its members may serve, then in each case the board must determine whether the simultaneous service would prevent such member from effectively serving on the listed company’s audit committee and shall publicly disclose its decision. No comparable provisions on audit committee membership exist under Luxembourg law or the Company’s articles of association. The Company’s board of directors, however, has concluded that the membership of the audit committee as a whole has sufficient recent and relevant financial experience to properly discharge its functions. In addition, the audit committee, from time to time and as it deems necessary, engages persons that meet all of the attributes of a financial expert as consultants. See Item 16.A. “Audit Committee Financial Expert”.

Standards for evaluating director independence.

Under the NYSE standards, the board is required, on a case by case basis, to express an opinion with regard to the independence or lack of independence of each individual director. Neither Luxembourg law nor the Company’s articles of association requires the board to express such an opinion. In addition, the definition of “independent” under the rules of the exchanges on which the Company’s securities are listed differ in some non-material respects from the definition contained in its articles of association. For more information on independent directors committee see Item 6.A. “Directors, Senior Management and Employees– Directors and Senior Management – Board of Directors”.

Audit committee responsibilities.

Pursuant to the Company’s articles of association, the audit committee shall assist the board of directors in fulfilling its oversight responsibilities relating to the integrity of its consolidated financial statements and system of internal controls and the independence and performance of the independent auditors. The audit committee is required to review material transactions (as defined by our articles of association) between the Company or its subsidiaries with related parties and also perform the other duties entrusted to it by the board. The NYSE requires certain matters to be set forth in the audit committee charter of U.S. listed companies.

The Company’s audit committee charter provides for many of the responsibilities that are expected from such bodies under the NYSE standard; however, due to the Company’s equity structure and holding company nature, the charter does not contain all such responsibilities, including provisions related to setting hiring policies for employees or former employees of independent auditors, discussion of risk assessment and risk management policies, and an annual performance evaluation of the audit committee. For more information on our audit committee see Item 6.C. “Directors, Senior Management and Employees– Board Practices – Audit Committee”.

Shareholder voting on equity compensation plans.

Under NYSE standards, shareholders must be given the opportunity to vote on equity-compensation plans and material revisions thereto, except for employment inducement awards, certain grants, plans and amendments in the context of mergers and acquisitions, and certain specific types of plans. The Company does not currently offer equity based compensation to our directors, senior management or employees, and therefore does not have a policy on this matter. For more information on directors compensation see Item 6.B. “Directors, Senior Management and Employees– Compensation”.

103

Disclosure of corporate governance guidelines.

NYSE-listed companies must adopt and disclose corporate governance guidelines. Neither Luxembourg law nor the Company’s articles of association require the adoption or disclosure of corporate governance guidelines. The Company’s board of directors follows corporate governance guidelines consistent with its equity structure and holding company nature, but the Company has not codified them and therefore does not disclose them on its website.

Code of business conduct and ethics.

Under NYSE standards, listed companies must adopt and disclose a code of business conduct and ethics for directors, officers and employees, and promptly disclose any waivers of the code for directors or executive officers. Neither Luxembourg law nor the Company’s articles of association require the adoption or disclosure of such a code of conduct. The Company, however, has adopted a code of conduct that applies to all directors, officers and employees that is posted on its website and which complies with the NYSE’s requirements, except that it does not require the disclosure of waivers of the code for directors and officers. In addition, it has adopted a supplementary code of ethics for senior financial officers, which is also posted on our website. See Item 16.B. “Code of Ethics”.

Chief executive officer certification.

A chief executive officer of a U.S. company listed on the NYSE must annually certify that he or she is not aware of any violation by the company of NYSE corporate governance standards. In accordance with NYSE rules applicable to foreign private issuers, the Company’s chief executive officer is not required to provide the NYSE with this annual compliance certification. However, in accordance with NYSE rules applicable to all listed companies, the Company’s chief executive officer must promptly notify the NYSE in writing after any of our executive officers becomes aware of any noncompliance with any applicable provision of the NYSE’s corporate governance standards. In addition, the Company must submit an executed written affirmation annually and an interim written affirmation each time a change occurs to the board or the audit committee.

PART III

Item 17.

Financial Statements

We have responded to Item 18 in lieu of responding to this Item.

Item 18.

Financial Statements

See pages F-1 through F-60 of this annual report.

Item 19.

Exhibits


Exhibit Number		Description
1.1		Updated and Consolidated Articles of Association of Tenaris S.A., dated as of June 1, 2011

2.1		Amended and Restated Deposit Agreement entered into between Tenaris S.A. and The Bank of New York Mellon *

7.1		Statement Explaining Calculation of Ratios

8.1		List of Subsidiaries of Tenaris S.A.

12.1		Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

104


Exhibit Number		Description
12.2		Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

13.1		Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

13.2		Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

15.1		Consent of Independent Registered Public Accounting Firm

15.2		Item 16-F letter issued by Price Waterhouse & Co. S.R.L.

*	The Deposit Agreement is incorporated by reference to the Registration Statement on Form F-6 filed by Tenaris S.A. on February 28, 2008 (File No. 333-149435).

105

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

TENARIS S.A.

CONSOLIDATED

FINANCIAL STATEMENTS

For the years ended December 31, 2010, 2009 and 2008

29, Avenue de la Porte – Neuve – 3^rd Floor

L – 2227 Luxembourg

LOGO

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of

Tenaris S.A.

In our opinion, the accompanying consolidated statement of financial position and the related consolidated statements of income, comprehensive income, changes in equity and cash flows present fairly, in all material respects, the financial position of Tenaris S.A. and its subsidiaries at December 31, 2010 and 2009, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2010 in conformity with International Financial Reporting Standards as issued by the International Accounting Standards Board and in conformity with International Financial Reporting Standards as adopted by the European Union. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2010, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in “Management’s report on internal control over financial reporting” appearing under Item 15. Our responsibility is to express opinions on these financial statements and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Price Waterhouse & Co. S.R.L., Bouchard 557, piso 8°, C1106ABG - Ciudad de Buenos Aires

T: +(54.11) 4850.0000, F: +(54.11) 4850.1800, www.pwc.com/ar

© 2011 In Argentina, the member firms of the global network of PricewaterhouseCoopers International Limited are Price Waterhouse & Co. S.R.L, Price Waterhouse & Co. Asesores de Empresas S.R.L. and PricewaterhouseCoopers Jurídico Fiscal S.R.L, each of which, either separately or jointly, are identified as PwC Argentina.

F-1

LOGO

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Buenos Aires, Argentina

June 30, 2011

PRICE WATERHOUSE & CO. S.R.L.

by /s/ Diego M. Niebuhr (Partner)

Diego M. Niebuhr

Price Waterhouse & Co. S.R.L., Bouchard 557, piso 8°, C1106ABG - Ciudad de Buenos Aires

T: +(54.11) 4850.0000, F: +(54.11) 4850.1800, www.pwc.com/ar

F-2

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

CONSOLIDATED INCOME STATEMENT


(all amounts in thousands of U.S. dollars, unless otherwise stated)	Notes		Year ended December 31,
	Notes		2010			2009			2008
Continuing operations
Net sales		1		7,711,598			8,149,320			11,987,760
Cost of sales		1 & 2		(4,700,810	)		(4,864,922	)		(6,698,285	)

Gross profit				3,010,788			3,284,398			5,289,475
Selling, general and administrative expenses		1 & 3		(1,515,870	)		(1,473,791	)		(1,787,952	)
Other operating income		5 (i)		85,658			7,673			35,140
Other operating expenses		5 (ii)		(7,029	)		(4,673	)		(411,013	)

Operating income				1,573,547			1,813,607			3,125,650
Interest income		6		32,855			30,831			48,711
Interest expense		6		(64,103	)		(118,301	)		(179,885	)
Other financial results		6		(21,305	)		(64,230	)		(99,850	)

Income before equity in earnings of associated companies and income tax				1,520,994			1,661,907			2,894,626
Equity in earnings of associated companies		7		70,057			87,041			89,423

Income before income tax				1,591,051			1,748,948			2,984,049
Income tax		8		(450,004	)		(513,211	)		(1,015,334	)

Income for continuing operations				1,141,047			1,235,737			1,968,715

Discontinued operations
Result for discontinued operations		29		—			(28,138	)		306,905


Income for the year				1,141,047			1,207,599			2,275,620


Attributable to:
Equity holders of the Company				1,127,367			1,161,555			2,124,802
Non-controlling interests				13,680			46,044			150,818

				1,141,047			1,207,599			2,275,620

Earnings per share attributable to the equity holders of the Company during year:
Weighted average number of ordinary shares (thousands)		9		1,180,537			1,180,537			1,180,537
Continuing and Discontinued operations
Basic and diluted earnings per share (U.S. dollars per share)		9		0.95			0.98			1.80
Basic and diluted earnings per ADS (U.S. dollars per ADS)		9		1.91			1.97			3.60
Continuing operations
Basic and diluted earnings per share (U.S. dollars per share)				0.95			1.00			1.49
Basic and diluted earnings per ADS (U.S. dollars per ADS)				1.91			2.00			2.99

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME


(all amounts in thousands of U.S. dollars)	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Income for the year		1,141,047			1,207,599			2,275,620
Other comprehensive income:
Currency translation adjustment		108,184			357,511			(486,636	)
Changes in the fair value of derivatives held as cash flow hedges		7,649			1,384			(8,513	)
Share of other comprehensive income of associates:
- Currency translation adjustment		11,413			(1,302	)		(51,004	)
- Changes in the fair value of derivatives held as cash flow hedges		1,049			2,722			(6,044	)
Income tax relating to components of other comprehensive income (*)		(3,316	)		2,089			3,003

Other comprehensive income for the year, net of tax		124,979			362,404			(549,194	)

Total comprehensive income for the year		1,266,026			1,570,003			1,726,426

Attributable to:
Equity holders of the Company		1,211,945			1,423,986			1,620,640
Non-controlling interests		54,081			146,017			105,786

		1,266,026			1,570,003			1,726,426

(*) Relates to Cash flow hedges.

The accompanying notes are an integral part of these Consolidated Financial Statements.

F-3

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

CONSOLIDATED STATEMENT OF FINANCIAL POSITION


(all amounts in thousands of U.S. dollars)	Notes		At December 31, 2010			At December 31, 2009
ASSETS
Non-current assets
Property, plant and equipment, net		10		3,780,580			3,254,587
Intangible assets, net		11		3,581,816			3,670,920
Investments in associated companies		12		671,855			602,572
Other investments		13		43,592			34,167
Deferred tax assets		21		210,523			197,603
Receivables		14		120,429	8,408,795		101,618	7,861,467


Current assets
Inventories		15		2,460,384			1,687,059
Receivables and prepayments		16		282,536			220,124
Current tax assets		17		249,317			260,280
Trade receivables		18		1,421,642			1,310,302
Available for sale assets		32		21,572			21,572
Other investments		19		676,224			579,675
Cash and cash equivalents		19		843,861	5,955,536		1,542,829	5,621,841

Total assets					14,364,331			13,483,308

EQUITY
Capital and reserves attributable to the Company’s equity holders					9,902,359			9,092,164
Non-controlling interests					648,221			628,672

Total equity					10,550,580			9,720,836

LIABILITIES
Non-current liabilities
Borrowings		20		220,570			655,181
Deferred tax liabilities		21		934,226			860,787
Other liabilities		22 (i)		193,209			192,467
Provisions		23 (ii)		83,922			80,755
Trade payables				3,278	1,435,205		2,812	1,792,002

Current liabilities
Borrowings		20		1,023,926			791,583
Current tax liabilities		17		207,652			306,539
Other liabilities		22 (ii)		233,590			192,190
Provisions		24 (ii)		25,101			28,632
Customer advances				70,051			95,107
Trade payables				818,226	2,378,546		556,419	1,970,470

Total liabilities					3,813,751			3,762,472

Total equity and liabilities					14,364,331			13,483,308

Contingencies, commitments and restrictions to the distribution of profits are disclosed in Note 26.

The accompanying notes are an integral part of these Consolidated Financial Statements.

F-4

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY


	Attributable to equity holders of the Company
(all amounts in thousands of U.S. dollars)	Share Capital (1)		Legal Reserves		Share Premium		Currency Translation Adjustment		Other Reserves			Retained Earnings (2)			Total			Non-controlling interests			Total
Balance at January 1, 2010		1,180,537		118,054		609,733		29,533		10,484			7,143,823			9,092,164			628,672			9,720,836


Income for the year		—		—		—		—		—			1,127,367			1,127,367			13,680			1,141,047

Currency translation adjustment		—		—		—		67,473		—			—			67,473			40,711			108,184
Hedge reserve, net of tax		—		—		—		—		4,643			—			4,643			(310	)		4,333
Share of other comprehensive income of associates		—		—		—		11,413		1,049			—			12,462			—			12,462

Other comprehensive income for the year		—		—		—		78,886		5,692			—			84,578			40,401			124,979

Total comprehensive income for the year		—		—		—		78,886		5,692			1,127,367			1,211,945			54,081			1,266,026

Acquisition and increase of non-controlling interests		—		—		—		—		(367	)		—			(367	)		(2,651	)		(3,018	)
Dividends paid in cash		—		—		—		—		—			(401,383	)		(401,383	)		(31,881	)		(433,264	)

Balance at December 31, 2010		1,180,537		118,054		609,733		108,419		15,809			7,869,807			9,902,359			648,221			10,550,580

(1)	The Company has an authorized share capital of a single class of 2.5 billion shares having a nominal value of $1.00 per share. As of December 31, 2010 there were 1,180,536,830 shares issued. All issued shares are fully paid.

(2)	The Distributable Reserve and Retained Earnings calculated according to Luxembourg Law are disclosed in Note 26.

The accompanying notes are an integral part of these Consolidated Financial Statements.

F-5

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Cont.)


	Attributable to equity holders of the Company
(all amounts in thousands of U.S. dollars)	Share Capital (1)		Legal Reserves		Share Premium		Currency Translation Adjustment			Other Reserves			Retained Earnings			Total			Non-controlling interests			Total
Balance at January 1, 2009		1,180,537		118,054		609,733		(223,779	)		2,127			6,489,899			8,176,571			525,316			8,701,887


Income for the year		—		—		—		—			—			1,161,555			1,161,555			46,044			1,207,599

Currency translation adjustment		—		—		—		254,614			—			—			254,614			102,897			357,511
Hedge reserve, net of tax		—		—		—		—			6,397			—			6,397			(2,924	)		3,473
Share of other comprehensive income of associates		—		—		—		(1,302	)		2,722			—			1,420			—			1,420

Other comprehensive income for the year		—		—		—		253,312			9,119			—			262,431			99,973			362,404

Total comprehensive income for the year		—		—		—		253,312			9,119			1,161,555			1,423,986			146,017			1,570,003

Acquisition and decrease of non-controlling interests		—		—		—		—			(783	)		—			(783	)		3,425			2,642
Change in equity reserves		—		—		—		—			21			—			21			—			21
Dividends paid in cash		—		—		—		—			—			(507,631	)		(507,631	)		(46,086	)		(553,717	)

Balance at December 31, 2009		1,180,537		118,054		609,733		29,533			10,484			7,143,823			9,092,164			628,672			9,720,836


	Attributable to equity holders of the Company
	Share Capital (1)		Legal Reserves		Share Premium		Currency Translation Adjustment			Other Reserves			Retained Earnings			Total			Non-controlling interests			Total
Balance at January 1, 2008		1,180,537		118,054		609,733		266,049			18,203			4,813,701			7,006,277			523,573			7,529,850

Income for the year		—		—		—		—			—			2,124,802			2,124,802			150,818			2,275,620

Currency translation adjustment		—		—		—		(438,824	)		—			—			(438,824	)		(47,812	)		(486,636	)
Hedge reserve, net of tax		—		—		—		—			(8,290	)		—			(8,290	)		2,780			(5,510	)
Share of other comprehensive income of associates		—		—		—		(51,004	)		(6,044	)		—			(57,048	)		—			(57,048	)

Other comprehensive income for the year		—		—		—		(489,828	)		(14,334	)		—			(504,162	)		(45,032	)		(549,194	)

Total comprehensive income for the year		—		—		—		(489,828	)		(14,334	)		2,124,802			1,620,640			105,786			1,726,426

Acquisition and decrease of non-controlling interests		—		—		—		—			(1,742	)		—			(1,742	)		(16,843	)		(18,585	)
Dividends paid in cash		—		—		—		—			—			(448,604	)		(448,604	)		(87,200	)		(535,804	)

Balance at December 31, 2008		1,180,537		118,054		609,733		(223,779	)		2,127			6,489,899			8,176,571			525,316			8,701,887

(1)	The Company has an authorized share capital of a single class of 2.5 billion shares having a nominal value of $1.00 per share. As of December 31, 2009 and 2008 there were 1,180,536,830 shares issued. All issued shares are fully paid.

The accompanying notes are an integral part of these Consolidated Financial Statements.

F-6

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

CONSOLIDATED STATEMENT OF CASH FLOWS


			Year ended December 31,
(all amounts in thousands of U.S. dollars)	Note		2010			2009			2008
Cash flows from operating activities
Income for the year				1,141,047			1,207,599			2,275,620
Adjustments for:
Depreciation and amortization		10 & 11		506,902			504,864			532,934
Income tax accruals less payments		28 (ii)		(57,979	)		(458,086	)		(225,038	)
Equity in earnings of associated companies		7		(70,057	)		(86,179	)		(89,556	)
Interest accruals less payments, net		28 (iii)		17,700			(24,167	)		55,492
Income from disposal of investment and other				—			—			(394,323	)
Changes in provisions				(364	)		(7,268	)		783
Impairment (reversal) charge		5		(67,293	)		—			502,899
Changes in working capital		28 (i)		(644,050	)		1,737,348			(1,051,632	)
Other, including currency translation adjustment				44,914			189,837			(142,174	)

Net cash provided by operating activities				870,820			3,063,948			1,465,005

Cash flows from investing activities
Capital expenditures		10 & 11		(847,316	)		(460,927	)		(443,238	)
Acquisitions of subsidiaries and associated companies				(302	)		(64,029	)		—
Proceeds from the sale of pressure control business (*)		29		—			—			1,113,805
Proceeds from disposal of property, plant and equipment and intangible assets				9,290			16,310			17,161
Dividends and distributions received from associated companies		12		14,034			11,420			15,032
Investments in short terms securities				(96,549	)		(533,812	)		41,667
Other				—			—			(3,428	)

Net cash (used in) provided by investing activities				(920,843	)		(1,031,038	)		740,999

Cash flows from financing activities
Acquisitions of non-controlling interests		27		(3,018	)		(9,555	)		(18,585	)
Dividends paid				(401,383	)		(507,631	)		(448,604	)
Dividends paid to non-controlling interest in subsidiaries				(31,881	)		(46,086	)		(87,200	)
Proceeds from borrowings				647,608			631,544			1,087,649
Repayments of borrowings				(862,921	)		(2,096,925	)		(2,122,268	)

Net cash used in financing activities				(651,595	)		(2,028,653	)		(1,589,008	)

(Decrease) increase in cash and cash equivalents				(701,618	)		4,257			616,996

Movement in cash and cash equivalents
At the beginning of the year				1,528,707			1,525,022			954,303
Effect of exchange rate changes				(6,924	)		9,124			(46,277	)
Decrease in cash due to deconsolidation		32		—			(9,696	)		—
(Decrease) increase in cash and cash equivalents				(701,618	)		4,257			616,996

At December 31,		28 (iv)		820,165			1,528,707			1,525,022

(*)	Includes $394 million of after-tax gain, $381 million of assets and liabilities held for sale and $339 million of income tax charges and related expenses.

The accompanying notes are an integral part of these Consolidated Financial Statements.

F-7

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

INDEX TO THE NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS


I.	GENERAL INFORMATION	IV.	OTHER NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS
		1	Segment information
II.	ACCOUNTING POLICIES (“AP”)	2	Cost of sales
A	Basis of presentation	3	Selling, general and administrative expenses
B	Group accounting	4	Labor costs (included in Cost of sales and in Selling, general and administrative expenses)
C	Segment information	5	Other operating items
D	Foreign currency translation	6	Financial results
E	Property, plant and equipment	7	Equity in earnings of associated companies
F	Intangible assets	8	Income tax
G	Impairment of non financial assets	9	Earnings and dividends per share
H	Other investments	10	Property, plant and equipment, net
I	Inventories	11	Intangible assets, net
J	Trade and other receivables	12	Investments in associated companies
K	Cash and cash equivalents	13	Other investments - non current
L	Equity	14	Receivables - non current
M	Borrowings	15	Inventories
N	Current and Deferred income tax	16	Receivables and prepayments
O	Employee benefits	17	Current tax assets and liabilities
P	Employees’ statutory profit sharing	18	Trade receivables
Q	Provisions	19	Cash and cash equivalents, and Other investments
R	Trade payables	20	Borrowings
S	Revenue recognition	21	Deferred income tax
T	Cost of sales and sales expenses	22	Other liabilities
U	Earnings per share	23	Non-current allowances and provisions
V	Financial instruments	24	Current allowances and provisions
		25	Derivative financial instruments
		26	Contingencies, commitments and restrictions on the distribution of profits
		27	Business combinations and other acquisitions
III.	FINANCIAL RISK MANAGEMENT	28	Cash flow disclosures
		29	Discontinued operations
A	Financial Risk Factors	30	Related party transactions
B	Financial instruments by category	31	Principal subsidiaries
C	Fair value by hierarchy	32	Processes in Venezuela
D	Fair value estimation	33	Corporate reorganization
E	Accounting for derivative financial instruments and hedging activities	34	Fees paid to the Company’s principal accountant
		35	Subsequent events

F-8

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

I. GENERAL INFORMATION

Tenaris S.A. (the “Company”), a Luxembourg corporation (societé anonyme holding), was incorporated on December 17, 2001, as a holding company in steel pipe manufacturing and distributing operations. The Company holds, either directly or indirectly, controlling interests in various subsidiaries. References in these financial statements to “Tenaris” refer to Tenaris S.A. and its consolidated subsidiaries.

The Company’s shares trade on the Milan Stock Exchange, the Buenos Aires Stock Exchange and the Mexico City Stock Exchange; the Company’s American Depositary Securities (“ADS”) trade on the New York Stock Exchange.

These Consolidated Financial Statements were approved for issue by the Company’s Board of Directors on February 23, 2011.

II. ACCOUNTING POLICIES

The principal accounting policies applied in the preparation of these Consolidated Financial Statements are set out below. These policies have been consistently applied to all the years presented, unless otherwise stated.

A	Basis of presentation

The Consolidated Financial Statements of Tenaris have been prepared in accordance with International Financial Reporting Standards (“IFRS”), as issued by the International Accounting Standards Board (“IASB”) and adopted by the European Union, under the historical cost convention, as modified by the revaluation of financial assets and liabilities (including derivative instruments) at fair value through profit or loss. The Consolidated Financial Statements are presented in thousands of U.S. dollars (“$”).

Certain comparative amounts have been reclassified to conform to changes in presentation in the current year.

The preparation of consolidated financial statements in conformity with IFRS requires management to make certain accounting estimates and assumptions that might affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the reporting dates, and the reported amounts of revenues and expenses during the reporting years. Actual results may differ from these estimates.

(1)

New and amended standards effective in 2010 and relevant for Tenaris

•

IFRS 3 (revised January 2008), “Business Combinations”

In January 2008, the IASB issued IFRS 3 (revised January 2008), “Business Combinations” (“IFRS 3 - revised”). IFRS 3 revised includes amendments that are meant to provide guidance for applying the acquisition method.

IFRS 3 revised replaces IFRS 3 (as issued in 2004) and comes into effect for business combinations for which the acquisition date is on or after the beginning of the first annual reporting period beginning on or after July 1, 2009.

This standard does not impact the current financial statements, and future impact is dependent on the existence of business combinations.

F-9

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

A	Basis of presentation (Cont.)

(1)

New and amended standards effective in 2010 and relevant for Tenaris (Cont.)

•

IAS 27 Revised, “Consolidated and separate financial statements”

This revised standard requires the effects of all transactions with non-controlling interests to be recorded in equity if there is no change in control and these transactions will no longer result in goodwill or gains and losses. The standard also specifies the accounting when control is lost. Any remaining interest in the entity is re-measured to fair value, and a gain or loss is recognized in profit or loss. This amendment has no material effect on the Company’s financial condition and results of operations.

•

Amendment to IFRS 5 “Non-current Assets held for sale and Discontinued Operations”

In May 2008, the IASB amended IFRS 5 “Non-current Assets held for sale and Discontinued Operations” by requiring this classification although the entity retains a non-controlling interest.

This standard does not impact the current financial statements, and future impact is dependent on the existence of discontinued operations.

(2)

New standards, interpretations and amendments to published standards that are not yet effective and have not been early adopted

•

IFRS 9, “Financial Instruments”

In November 2009, the IASB issued IFRS 9 “Financial Instruments” which establishes principles for the financial reporting of financial assets by simplifying their classification and measurement.

This interpretation is applicable for annual periods beginning on or after 1 January 2013. Earlier application is not permitted for entities that prepare financial statements in accordance with IFRS as adopted by the EU, since the interpretation is not yet adopted by the EU.

The Company’s management has not yet assessed the potential impact that the application of IFRS 9 will have on the Company’s financial statements.

•

Improvements to International Financial Reporting Standards

In May 2010, the IASB issued “Improvements to International Financial Reporting Standards” by which it amended several international accounting and financial reporting standards. Entities shall apply these amendments for annual periods beginning on or after January 1, 2011. Earlier application is not permitted for entities that prepare financial statements in accordance with IFRS as adopted by the EU, since these improved standards are not yet adopted by the EU.

The Company’s management estimates that the application of these amendments will not have a material effect on the Company’s financial condition or results of operations.

Management assessed the relevance of other new standards, amendments or interpretations not yet effective and concluded that they are not relevant to Tenaris.

B	Group accounting

(1)

Subsidiaries

Subsidiaries are all entities which are controlled by Tenaris as a result of its ability to govern an entity’s financial and operating policies generally accompanying a shareholding of more than 50% of the voting rights. Subsidiaries are consolidated from the date on which control is exercised by the Company and are no longer consolidated from the date control ceases.

F-10

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

B	Group accounting (Cont.)

(1)

Subsidiaries (Cont.)

The purchase method of accounting is used to account for the acquisition of subsidiaries by Tenaris. The cost of an acquisition is measured as the fair value of the assets given, equity instruments issued and liabilities incurred or assumed at the date of exchange. Acquisition-related costs are expensed as incurred. Identifiable assets acquired, liabilities and contingent liabilities assumed in a business combination are measured initially at their fair values at the acquisition date. Any non-controlling interest in the acquiree is measured either at fair value or at the non-controlling interest’s proportionate share of the acquiree’s net assets. The excess of the consideration transferred, the amount of any non-controlling interest in the acquiree over the fair value of Tenaris share of the identifiable net assets acquired is recorded as goodwill. If this is less than the fair value of the net assets of the subsidiary acquired, the difference is recognized directly in the Consolidated Income Statement.

Material inter-company transactions, balances and unrealized gains (losses) on transactions between Tenaris subsidiaries have been eliminated in consolidation. However, since the functional currency of some subsidiaries is its respective local currency, some financial gains (losses) arising from inter-company transactions are generated. These are included in the Consolidated Income Statement under Other financial results.

See Note 31 for the list of the principal subsidiaries.

(2)

Associates

Associates are all entities in which Tenaris has significant influence but not control, generally accompanying a shareholding of between 20% and 50% of the voting rights. Investments in associates are accounted for by the equity method of accounting and are initially recognized at cost. The Company’s investment in associates includes goodwill identified in acquisition, net of any accumulated impairment loss.

Unrealized results on transactions between Tenaris and its associated companies are eliminated to the extent of Tenaris’ interest in the associated companies. Unrealized losses are also eliminated unless the transaction provides evidence of an impairment indicator of the asset transferred. Financial statements of associated companies have been adjusted where necessary to ensure consistency with IFRS.

The Company’s pro-rata share of earnings in associates is recorded in the Consolidated Income Statement under Equity in earnings of associated companies. The Company’s pro-rata share of changes in other reserves is recognized in the Consolidated Statement of Changes in Equity under Other Reserves.

The Company’s investment in Ternium S.A. (“Ternium”) has been accounted for by the equity method, as Tenaris has significant influence as defined by IAS 28, “Investments in Associates”. At December 31, 2010, Tenaris holds 11.46% of Ternium’s common stock. The Company’s investment in Ternium is carried at incorporation cost plus proportional ownership of Ternium’s earnings and other shareholders’ equity accounts. Because the exchange of its holdings in Amazonia and Ylopa for shares in Ternium was considered to be a transaction between companies under common control of San Faustin N.V., Tenaris recorded its initial ownership interest in Ternium at $229.7 million, the carrying value of the investments exchanged. This value was $22.6 million less than Tenaris proportional ownership of Ternium’s shareholders’ equity at the transaction date. As a result of this treatment, Tenaris investment in Ternium will not reflect its proportional ownership of Ternium’s net equity position. Ternium carried out an initial public offering (“IPO”) of its shares on February 1, 2006, listing its ADS on the New York Stock Exchange.

Tenaris reviews investments in associated companies for impairment whenever events or changes in circumstances indicate that the asset’s carrying amount may not be recoverable, such as a significant or prolonged decline in fair value below the carrying value. Tenaris carries its investment in Ternium at its proportional equity value, with no additional goodwill or intangible assets recognized. At December 31, 2010, 2009 and 2008, no impairment provisions were recorded on Tenaris’ investment in Ternium.

F-11

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

C	Segment information

The Company is organized in two major business segments: Tubes and Projects, which are also the reportable operating segments.

For purposes of this determination, the Company considered not only the nature of products and services, the economic characteristics and financial effects of each business activities in which the entity engages and the related economic environment in which it operates but particularly also factors such as the nature of the products and services, the nature of the production processes, the type or class of customer for the products and services and the method used to distribute the products or provide the related services.

The Tubes segment includes the operations that consist of the production and selling of both seamless and welded steel tubular products and related services mainly for the oil and gas industry, particularly oil country tubular goods (OCTG) used in drilling operations, and certain other industrial applications with a production process that consists in the transformation of steel into tubular products. Business activities included in this segment are mainly dependent on the oil and gas industry worldwide, as this industry is a major consumer of steel pipe products, particularly OCTG used in drilling activities. Demand for steel pipe products from the oil and gas industry has historically been volatile and depends primarily upon the number of oil and natural gas wells being drilled, completed and reworked, and the depth and drilling conditions of these wells. Sales are generally done to the end user customers, with exports being done through a centrally managed global distribution network and domestic sales done, through local subsidiaries.

The Projects segment includes the operations that consist of the production and selling of welded steel pipe products mainly used in the construction of major pipeline projects for the transportation of gas and fluids with a production process that consists in the transformation of steel into large diameter welded tubular products, including SAW process and specific coating for most of the products. Pipeline projects are typically spread along hundreds of kilometers and are subject to specific government policies and other regulations. Accordingly, this business depends to a large extent on the number of active pipeline projects (and not on the level of drilling activity), particularly in the South American regional market, which is the region from which most revenues in this segment are derived. To a significant extent, products are distributed directly to end customers through the local subsidiaries. Each order involves the delivery of significant volumes of products in stages through an extended period of time.

The Other segment includes all other business activities and operating segments that are not required to be separately reported, including the operations that consist of the production and selling of sucker rods, welded steel pipes for electric conduits, industrial equipment and raw materials that exceed Tenaris’ internal requirements.

Corporate general and administrative expenses have been allocated to the Tubes segment.

Tenaris groups its geographical information in five areas: North America, South America, Europe, Middle East and Africa, and Far East and Oceania. For purposes of reporting geographical information, net sales are allocated to geographical areas based on the customer’s location; allocation of assets and capital expenditures and associated depreciation and amortization are based on the geographic location of the assets.

D	Foreign currency translation

(1)

Functional and presentation currency

IAS 21 (revised) defines the functional currency as the currency of the primary economic environment in which an entity operates.

The functional and presentation currency of the Company is the U.S. dollar. The U.S. dollar is the currency that best reflects the economic substance of the underlying events and circumstances relevant to Tenaris global operations.

F-12

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

D	Foreign currency translation (Cont.)

(1)

Functional and presentation currency (Cont.)

Generally, the functional currency of the Company’s subsidiaries is the respective local currency. Tenaris argentine operations, however, which consist of Siderca S.A.I.C. (“Siderca”) and its argentine subsidiaries, have determined their functional currency to be the U.S. dollar, based on the following considerations:

•

Sales are mainly negotiated, denominated and settled in U.S. dollars. If priced in a currency other than the U.S. dollar, the price considers exposure to fluctuation in the exchange rate versus the U.S. dollar;

•

Prices of critical raw materials and inputs are priced and settled in U.S. dollars;

•

The exchange rate of the currency of Argentina has long-been affected by recurring and severe economic crises; and

•

Net financial assets and liabilities are mainly received and maintained in U.S. dollars.

In addition to Siderca, the colombian subsidiaries and most of the Company’s distributing subsidiaries and intermediate holding subsidiaries have the U.S. dollar as their functional currency, reflecting the transaction environment and cash flow of these operations.

(2)

Transactions in currencies other than the functional currency

Transactions in currencies other than the functional currency are translated into the functional currency using the exchange rates prevailing at the date of the transactions or valuation where items are re-measured.

At the end of each reporting period: (i) monetary items denominated in currencies other than the functional currency are translated using the closing rates; (ii) non-monetary items that are measured in terms of historical cost in a currency other than the functional currency are translated using the exchange rates prevailing at the date of the transactions; and (iii) non-monetary items that are measured at fair value in a currency other than the functional currency are translated using the exchange rates prevailing at the date when the fair value was determined.

Foreign exchange gains and losses resulting from the settlement of such transactions and from the translation at year-end exchange rates of monetary assets and liabilities denominated in currencies other than the functional currency are recorded as gains and losses from foreign exchange and included in “Other financial results” in the Consolidated Income Statement, except when deferred in equity as qualifying cash flow hedges and qualifying net investment hedges. Translation differences on non-monetary financial assets and liabilities such as equities held at fair value through profit or loss are recognized in profit or loss as part of the “fair value gain or loss,” while translation differences on non-monetary financial assets such as equities classified as available for sale are included in the “available for sale reserve” in equity. Tenaris had no such assets or liabilities for any of the periods presented.

(3)

Translation of financial information in currencies other than the functional currency

Results of operations for subsidiaries whose functional currencies are not the U.S. dollar are translated into U.S. dollars at the average exchange rates for each quarter of the year. Financial Statement positions are translated at the end-of-year exchange rates. Translation differences are recognized in a separate component of equity as currency translation adjustments. In the case of a sale or other disposal of any of such subsidiaries, any accumulated translation difference would be recognized in income as a gain or loss from the sale.

E	Property, plant and equipment

Property, plant and equipment are recognized at historical acquisition or construction cost less accumulated depreciation and impairment losses; historical cost includes expenditure that is directly attributable to the acquisition of the items. Property, plant and equipment acquired through acquisitions accounted for as business combinations have been valued initially at the fair market value of the assets acquired.

Major overhaul and rebuilding expenditures are capitalized as property, plant and equipment only when the investment enhances the condition of assets beyond its original condition. The carrying amount of the replaced part is derecognized.

F-13

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

E	Property, plant and equipment (Cont.)

Ordinary maintenance expenses on manufacturing properties are recorded as cost of products sold in the year in which they are incurred.

Borrowing costs that are attributable to the acquisition or construction of certain capital assets are capitalized as part of the cost of the asset, in accordance with IAS 23(R) (“Borrowing Costs”). Assets for which borrowing costs are capitalized are those that require a substantial period of time to prepare for their intended use.

Depreciation method is reviewed at each year end. Depreciation is calculated using the straight-line method to depreciate the cost of each asset to its residual value over its estimated useful life, as follows:


Land			No Depreciation
Buildings and improvements			30-50 years
Plant and production equipment			10-30 years
Vehicles, furniture and fixtures, and other equipment			4-10 years

The asset’s residual values and useful lives of significant plant and production equipment are reviewed, and adjusted if appropriate, at each year-end date.

Management’s re-estimation of assets useful lives, performed in accordance with IAS 16 (“Property plant and equipment”), did not materially affect depreciation expenses for 2010.

Tenaris depreciates each significant part of an item of property, plant and equipment for its different production facilities that (i) can be properly identified as an independent component with a cost that is significant in relation to the total cost of the item, and (ii) has a useful operating life that is different from another significant part of that same item of property, plant and equipment.

Gains and losses on disposals are determined by comparing the proceeds with the carrying amount of assets and are recognized under Other operating income or Other operating expenses in the Consolidated Income Statement.

F	Intangible assets

(1)

Goodwill

Goodwill represents the excess of the acquisition cost over the fair value of Tenaris’s share of net identifiable assets acquired as part of business combinations determined mainly by independent valuations. Goodwill is tested annually for impairment and carried at cost less accumulated impairment losses. Impairment losses on goodwill are not reversed. Goodwill is included on the Consolidated Statement of Financial Position under Intangible assets, net.

For the purpose of impairment testing, goodwill is allocated to a subsidiary or group of subsidiaries that are expected to benefit from the business combination which generated the goodwill being tested.

(2)

Information systems projects

Costs associated with developing or maintaining computer software programs are generally recognized as an expense as incurred. However, costs directly related to the development, acquisition and implementation of information systems are recognized as intangible assets if it is probable they have economic benefits exceeding one year.

Information systems projects recognized as assets are amortized using the straight-line method over their useful lives, not exceeding a period of 3 years. Amortization charges are classified as Selling, general and administrative expenses in the Consolidated Income Statement.

F-14

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

F	Intangible assets (Cont.)

(3)

Licenses, patents, trademarks and proprietary technology

Licenses, patents, trademarks, and proprietary technology acquired in a business combination are initially recognized at fair value at the acquisition date. Licenses, patents, proprietary technology and those trademarks that have a finite useful life are carried at cost less accumulated amortization. Amortization is calculated using the straight-line method to allocate the cost over their estimated useful lives, and does not exceed a period of 10 years.

The balance of acquired trademarks amounts to $89.7 million and $88.0 million at December 31, 2010 and 2009 respectively, have indefinite useful lives according to external appraisal. Main factors considered in the determination of the indefinite useful lives, include the years that they have been in service and their recognition among customers in the industry.

(4)

Research and development

Research expenditures as well as development costs that do not fulfill the criteria for capitalization are recorded as Cost of sales in the Consolidated Income Statement as incurred. Research and development expenditures included in Cost of sales for the years 2010, 2009 and 2008 totaled $61.8 million, $62.7 million and $77.3 million, respectively.

(5)

Customer relationships

In accordance with IFRS 3 and IAS 38, Tenaris has recognized the value of customer relationships separately from goodwill attributable to the acquisition of Maverick and Hydril.

Customer relationships acquired in a business combination are recognized at fair value at the acquisition date. Customer relationships acquired in a business combination have a finite useful life and are carried at cost less accumulated amortization. Amortization is calculated using the straight line method over the expected life of approximately 14 years for Maverick and 10 years for Hydril.

G	Impairment of non financial assets

Long-lived assets including identifiable intangible assets are reviewed for impairment at the lowest level for which there are separately identifiable cash flows (cash generating units, or CGU). Most of the Company’s principal subsidiaries that constitute a CGU have a single main production facility and, accordingly, each such subsidiary represents the lowest level of asset aggregation that generates largely independent cash inflows.

(a) first, to reduce the carrying amount of any goodwill allocated to the CGU; and

F-15

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

G	Impairment of non financial assets (Cont.)

Non-financial assets other than goodwill that suffered an impairment are reviewed for possible reversal at each reporting date. In 2010, the Company reversed the impairment registered in 2008 corresponding to Prudential CGU’s Customer Relationships (see Note 5).

In 2010 and 2009, none of the Company’s CGUs including long-lived assets with finite useful lives, were tested for impairment as no impairment indicators were identified. In 2008, Tenaris identified the presence of impairment indicators in certain CGUs and, accordingly, carried out impairment tests (see Note 5 “Other operating items — Impairment charge” for the related disclosures of the CGU’s impairment tests) and Note 11 “Intangible assets, net” for a detail of the different impairment tests for goodwill.

H	Other investments

Other investments consist primarily of investments in financial debt instruments and time deposits with an original maturity of more than three months.

These investments are classified as financial assets “at fair value through profit or loss”.

Purchases and sales of financial investments are recognized as of their settlement date.

The fair values of quoted investments are based on current bid prices. If the market for a financial investment is not active or the securities are not listed, Tenaris estimates the fair value by using standard valuation techniques (see Section III Financial Risk Management).

Results from financial investments are recognized in Financial Results in the Consolidated Income Statement.

I	Inventories

Inventories are stated at the lower of cost (calculated principally on the first-in-first-out “FIFO” method) and net realizable value. The cost of finished goods and goods in process is comprised of raw materials, direct labor, other direct costs and related production overhead costs. It excludes borrowing costs. Tenaris estimates net realizable value of inventories by grouping, where applicable, similar or related items. Net realizable value is the estimated selling price in the ordinary course of business, less any estimated costs of completion and selling expenses. Goods in transit at year end are valued based on supplier’s invoice cost.

Tenaris establishes an allowance for obsolete or slow-moving inventory related to finished goods, supplies and spare parts. For slow moving or obsolete finished products, an allowance is established based on management’s analysis of product aging. An allowance for slow-moving inventory of supplies and spare parts is established based on management’s analysis of such items to be used as intended and the consideration of potential obsolescence due to technological changes.

J	Trade and other receivables

Trade and other receivables are recognized initially at fair value, generally the original invoice amount. Tenaris analyzes its trade accounts receivable on a regular basis and, when aware of a specific counterparty’s difficulty or inability to meet its obligations to Tenaris, impairs any amounts due by means of a charge to an allowance for doubtful accounts receivable. Additionally, this allowance is adjusted periodically based on the aging of receivables.

F-16

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

K	Cash and cash equivalents

Cash and cash equivalents are comprised of cash in banks, liquidity funds and short-term investments with a maturity of less than three months at the date of purchase. Assets recorded in cash and cash equivalents are carried at fair market value or at historical cost which approximates fair market value.

In the Consolidated Statement of Financial Position, bank overdrafts are included in Borrowings in current liabilities. For the purposes of the Consolidated Statement of Cash Flows, cash and cash equivalents includes overdrafts.

L	Equity

(1)

Equity components

The Consolidated Statement of Changes in Equity includes:

•

The value of share capital, legal reserve, share premium and other distributable reserve calculated in accordance with Luxembourg Law;

•

The currency translation adjustment, other reserves, retained earnings and non-controlling interest calculated in accordance with IFRS.

(2)

Share capital

The Company has an authorized share capital of a single class of 2.5 billion shares having a nominal value of $1.00 per share. Total ordinary shares issued and outstanding as of December 31, 2010, 2009 and 2008 are 1,180,536,830 with a par value of $1.00 per share with one vote each. All issued shares are fully paid.

(3)

Dividends distribution by the Company to shareholders

Dividends distributions are recorded in the Company’s financial statements when Company’s shareholders have the right to receive the payment, or when interim dividends are approved by the Board of Directors in accordance with the by-laws of the Company.

Dividends may be paid by the Company to the extent that it has distributable retained earnings, calculated in accordance with Luxembourg law (see Note 26).

M	Borrowings

Borrowings are recognized initially at fair value net of transaction costs incurred. In subsequent years, borrowings are stated at amortized costs.

N	Current and Deferred income tax

The tax expense for the period comprises current and deferred tax. Tax is recognized in the Consolidated Income Statement, except to the extent that it relates to items recognized in the Consolidated Statement of Other Comprehensive Income. In this case, the tax is also recognized in the Consolidated Statement of Other Comprehensive Income.

The current income tax charge is calculated on the basis of the tax laws enacted or substantially enacted at the reporting date in the countries where the Company’s subsidiaries operate and generate taxable income. Management periodically evaluates positions taken in tax returns with respect to situations in which applicable tax regulations are subject to interpretation and establishes provisions when appropriate.

Deferred income tax is recognized applying the liability method on temporary differences arising between the tax bases of assets and liabilities and their carrying amounts in the financial statements. The principal temporary differences arise from fair value adjustments of assets acquired in business combinations, the effect of currency translation on fixed assets, depreciation on property, plant and equipment, valuation of inventories and provisions for pension plans. Deferred tax assets are also recognized for net operating loss carry-forwards. Deferred tax assets and liabilities are measured at the tax rates that are expected to apply in the time period when the asset is realized or the liability is settled, based on tax laws that have been enacted or substantively enacted at the reporting date.

F-17

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

N	Current and Deferred income tax (Cont.)

Deferred tax assets are recognized to the extent it is probable that future taxable income will be available against which the temporary differences can be utilized. At the end of each reporting period, Tenaris reassesses unrecognized deferred tax assets. Tenaris recognizes a previously unrecognized deferred tax asset to the extent that it has become probable that future taxable income will allow the deferred tax asset to be recovered.

O	Employee benefits

(a)

Employee severance indemnity

Employee severance indemnity costs are assessed at each year-end using the projected unit credit method. Employee severance indemnity obligations are measured at the present value of the estimated future cash outflows, based on actuarial calculations provided by independent advisors and in accordance with current legislation and labor contracts in effect in each respective country. The cost of this obligation is charged to the Consolidated Income Statement over the expected service lives of employees.

This provision is primarily related to the liability accrued for employees at Tenaris’ Italian subsidiary.

As from January 1, 2007 as a consequence of a change in an Italian law, employees were entitled to make contributions to external funds or to maintain the contributions within the company. If the employee chooses to make contributions to the external funds Tenaris’ Italian subsidiary pays every year the matured contribution to the funds and no more obligation will be in charge of it. As a consequence of the abovementioned, the structure of the plan could be changed from a defined benefit plan to a defined contribution plan effective from the date of the choice, but only limited to the contributions of 2007 onwards.

(b)

Defined benefit pension obligations

Defined benefit plans determine an amount of pension benefit that an employee will receive on retirement, usually dependent on one or more factors such as age, years of service and compensation.

The liability recognized in the Consolidated Statement of Financial Position in respect of defined benefit pension plans is the present value of the defined benefit obligation at the end of the reporting year less the fair value of plan assets together with adjustments for unrecognized past-service costs and unrecognized actuarial gains and losses. The present value of the defined benefit pension obligation is calculated, at least at each year-end by independent advisors using the projected unit credit method based on actuarial calculations provided by independent advisors.

Certain officers of Tenaris are covered by defined benefit employee retirement plans designed to provide post-retirement and other benefits.

Benefits under this plan are provided in U.S. dollars, and are calculated based on seven-year salary averages. Tenaris accumulates assets for the payment of benefits expected to be disbursed by this plan in the form of investments that are subject to time limitations for redemption. These investments are neither part of a specific pension plan nor are they segregated from Tenaris’ other assets. As a result, this plan is considered to be “unfunded” under IFRS definitions.

Tenaris sponsors other four funded and unfunded non-contributory defined benefit pension plans in certain subsidiaries. The plans provide defined benefits based on years of service and, in the case of salaried employees, final average salary.

All of Tenaris’ plans recognize actuarial gains and losses over the average remaining service lives of employees.

(c)

Other compensation obligations

Employee entitlements to annual leave and long-service leave are accrued as earned.

Other length of service based compensation to employees in the event of dismissal or death is charged to income in the year in which it becomes payable.

F-18

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

O	Employee benefits (Cont.)

(d)

Employee retention and long term incentive program

On January 1, 2007 Tenaris adopted an employee retention and long term incentive program. Pursuant to this program, certain senior executives will be granted with a number of units’ equivalent in value to the equity book value per share (excluding non-controlling interest). The units will be vested over four years period and Tenaris will redeem vested units following a period of seven years from the grant date, or when the employee ceases employment, at the equity book value per share at the time of payment. Beneficiaries will also receive a cash amount per unit equivalent to the dividend paid per share whenever the Company pays a cash dividend to its shareholders. As the cash payment of the benefit is tied to the book value of the shares, and not to their market value, Tenaris valued this long-term incentive program as a long term benefit plan as classified in IAS 19.

Annual compensation under this program is not expected to exceed 35% in average of the total annual compensation of the beneficiaries.

The total value of the units granted to date under the program, considering the number of units and the book value per share amounts to $40.4 million and $27.6 million at December 31, 2010 and 2009, respectively. As of December 31, 2010, and 2009 Tenaris has recorded a total liability of $33.5 million and $19.6 million, respectively, based on actuarial calculations provided by independent advisors.

P	Employees’ statutory profit sharing

Under Mexican law, the Company’s Mexican subsidiaries are required to pay to their employees an annual benefit calculated on a similar basis to that used for local income tax purposes. Employee statutory profit sharing is calculated using the liability method, and is recorded in Current other liabilities and Non-current other liabilities in the Consolidated Statement of Financial Position. Because Mexican employee statutory profit sharing is determined on a similar basis to that used for determining local income taxes, Tenaris accounts for temporary differences arising between the statutory calculation and reported expense as determined under IFRS in a manner similar to the calculation of deferred income tax.

Q	Provisions

Tenaris is subject to various claims, lawsuits and other legal proceedings, including customer claims, in which a third party is seeking payment for alleged damages, reimbursement for losses or indemnity. Tenaris’ potential liability with respect to such claims, lawsuits and other legal proceedings cannot be estimated with certainty. Management periodically reviews the status of each significant matter and assesses potential financial exposure. If a potential loss from a claim or proceeding is considered probable and the amount can be reasonably estimated, a provision is recorded. Accruals for loss contingencies reflect a reasonable estimate of the losses to be incurred based on information available to management as of the date of preparation of the financial statements, and take into consideration Tenaris’ litigation and settlement strategies. These estimates are primarily constructed with the assistance of legal counsel. As the scope of liabilities become better defined, there may be changes in the estimates of future costs which could have a material adverse effect on its results of operations, financial condition and cash flows.

If Tenaris expects to be reimbursed for an accrued expense, as would be the case for an expense or loss covered under an insurance contract, and reimbursement is considered virtually certain, the expected reimbursement is recognized as a receivable.

R	Trade payables

Trade payables are recognized initially at fair value and subsequently measured at amortized cost.

S	Revenue recognition

Revenue comprises the fair value of the consideration received or receivable for the sale of goods and services in the ordinary course of Tenaris’ activities. Revenue is shown net of value-added tax, returns, rebates and discounts and after eliminating sales within the group.

F-19

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

S	Revenue recognition (Cont.)

Tenaris’ products and services are sold based upon purchase orders, contracts or upon other persuasive evidence of an arrangement with customers, including that the sales price is known or determinable. Sales are recognized as revenue upon delivery, when neither continuing managerial involvement nor effective control over the products is retained by Tenaris and when collection is reasonably assured. Delivery is defined by the transfer of risk, provision of sales contracts and may include delivery to a storage facility located at one of the Company’s subsidiaries. For bill and hold transactions revenue is recognized only to the extent (a) it is probable delivery will be made; (b) the products have been specifically identified and are ready for delivery; (c) the sales contract specifically acknowledges the deferred delivery instructions; (d) the usual payment terms apply.

The percentage of total sales that were generated from bill and hold arrangements for products located in Tenaris’s storage facilities that have not been shipped to customers amounted to 1.2%, 0.7% and 1.7% as of December 31, 2010, 2009 and 2008, respectively. The Company has not experienced any material claims requesting the cancellation of bill and hold transactions.

Other revenues earned by Tenaris are recognized on the following bases:

•

Interest income: on the effective yield basis.

•

Dividend income from investments in other companies: when Tenaris’ right to receive payment is established.

T	Cost of sales and sales expenses

Cost of sales and sales expenses are recognized in the Consolidated Income Statement on the accrual basis of accounting.

Commissions, freight and other selling expenses, including shipping and handling costs, are recorded in Selling, general and administrative expenses in the Consolidated Income Statement.

U	Earnings per share

Earnings per share are calculated by dividing the income attributable to equity holders of the Company by the daily weighted average number of common shares outstanding during the year.

V	Financial instruments

Non derivative financial instruments comprise investment in financial debt instruments and equity, time deposits, trade and other receivables, cash and cash equivalents, borrowings, and trade and other payables. Tenaris non derivative financial instruments are classified into the following categories:

•

Financial instruments at fair value through profit and loss: comprises mainly cash and cash equivalents and investments in financial debt instruments and time deposits held for trading.

•

Loans and receivables: measured at amortized cost using the effective interest rate method less any impairment.

•

Available for sale assets: See Note 32

•

Other financial liabilities: measured at amortized cost using the effective interest rate method.

The classification depends on the nature and purpose of the financial instrument and is determined at the time of initial recognition.

Financial assets and liabilities are recognized and derecognized on their settlement date.

Tenaris has identified certain embedded derivatives and in accordance with IAS 39 (“Financial Instruments: Recognition and Measurement”) has accounted them separately from their host contracts. The result has been recognized under “Foreign exchange derivatives contracts results”.

Accounting for derivative financial instruments and hedging activities is included within the Section III, Financial Risk Management.

F-20

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

III. FINANCIAL RISK MANAGEMENT

The multinational nature of Tenaris’ operations and customer base expose the Company to a variety of risks, mainly related to market risks (including the effects of changes in foreign currency exchange rates and interest rates) and capital risk. To manage the volatility related to these exposures, management evaluates exposures on a consolidated basis to take advantage of logical exposure netting. For each foreign currency’s net exposure, the Company or its subsidiaries may enter into various derivative transactions in order to manage potential adverse impacts on the Tenaris’ financial performance. Such derivative transactions are executed in accordance with internal policies and hedging practices.

A.	Financial Risk Factors

(i)

Capital Risk

Tenaris seeks to maintain an adequate debt to total equity ratio considering the industry and the markets where it operates. The year end ratio of debt to total equity (where “debt” comprises financial borrowings and “total equity” is the sum of financial borrowings and equity) is 0.11 as of December 31, 2010, in comparison with 0.13 as of December 31, 2009. The Company does not have to comply with regulatory capital adequacy requirements as known in the financial services industry.

(ii)

Foreign exchange risk

Tenaris manufactures and sells its products in a number of countries throughout the world and consequently is exposed to foreign exchange rate risk. Since the Company’s functional currency is the U.S. dollar the purpose of Tenaris’ foreign currency hedging program is mainly to reduce the risk caused by changes in the exchange rates of other currencies against the U.S. dollar.

Tenaris’ exposure to currency fluctuations is reviewed on a periodic basis. A number of derivative transactions are performed in order to achieve an efficient coverage. Almost all of these hedging transactions are forward exchange rates contracts (see Note 25 Derivative financial instruments).

Tenaris does not enter into derivative financial instruments for trading or other speculative purposes, other than non-material investments in structured products.

Because a number of subsidiaries have functional currencies other than the U.S. dollar, the results of hedging activities, reported in accordance with IFRS, may not reflect management’s assessment of its foreign exchange risk hedging program. Inter-company balances between Tenaris subsidiaries may generate financial gains (losses) to the extent that functional currencies differ.

The value of Tenaris’ financial assets and liabilities is subject to changes arising out of the variation of foreign currency exchange rates. The following table provides a breakdown of Tenaris’ main financial assets and liabilities (including foreign exchange derivative contracts) exposed to foreign exchange risk as of December 31, 2010.


(all amounts in thousands of U.S. dollars)	Exposure
Brazilian real / U.S. dollar		304,229
Mexican Peso / U.S. dollar		177,227
Euro / U.S. dollar		(113,836	)
Argentine Peso / U.S. dollar		(74,440	)
Canadian dollar / U.S. dollar		(68,195	)

F-21

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

A.	Financial Risk Factors (Cont.)

(ii)

Foreign exchange risk (Cont.)

The main relevant exposures correspond to:

•

Brazilian real / U.S. dollar.

Consists primarily of Cash and cash equivalent and Other investments denominated in U.S. dollar at subsidiaries which functional currency is the Brazilian real. A change of 1% in the BRL/USD exchange rate would generate a pre-tax gain / loss of $2.7 million, which would be to a large extent offset by changes to Tenaris’ net equity position. Tenaris has also entered into foreign exchange derivative contracts to preserve the U.S. dollar value of certain anticipated sales denominated in Brazilian real, which could add a gain / loss of $0.3 million per one percent change in the BRL/USD exchange rate.

•

Mexican peso / U.S. dollar.

Consists primarily of various foreign exchange derivative contracts entered to preserve the U.S. dollar value of borrowings denominated in Mexican peso. A change of 1% in the MXN/USD exchange rate would generate a pre-tax gain / loss of $2.0 million. Additionally Tenaris has Cash and cash equivalents and sales denominated in U.S. dollar at subsidiaries which functional currency is the Mexican peso, that could offset this impact by $0.2 million per one percent change in the MXN/USD exchange rate.

•

Euro / U.S. dollar.

Consists primarily of U.S. dollar-denominated borrowings at certain European subsidiaries which functional currency is the Euro, partially offset by Euro denominated trade payables at subsidiaries which functional currency is the U.S. dollar. A change of 1% in the EUR/USD exchange rate would generate a pre-tax gain / loss of $1.1 million, which would be to a large extent offset by changes to Tenaris’ net equity position.

Considering the balances held as of December 31, 2010 on financial assets and liabilities exposed to foreign exchange rate fluctuations, Tenaris estimates that the impact of a simultaneous 1% favorable / unfavorable movement in the levels of foreign currencies exchange rates relative to the U.S. dollar, would be a pre-tax gain / loss of $7.9 million (including a loss / gain of $1.8 million due to foreign exchange derivative contracts), which would be partially offset by changes to Tenaris’ net equity position of $3.6 million. For balances held as of December 31, 2009, a simultaneous 1% favorable/unfavorable movement in the foreign currencies exchange rates relative to the U.S. dollar, would have generated a pre-tax gain / loss of $12.6 million (including a non material effect due to foreign exchange derivative contracts), partially offset by changes to the net equity position of $8.3 million.

Additionally, the Company has recognized an embedded derivative in connection with a ten-year steel supply agreement signed in 2007 by a Canadian subsidiary which as of December 31, 2010 has an estimated outstanding amount of approximately $228 million. The Company estimates that the impact of a 1% favorable / unfavorable movement in the USD/CAD exchange rate would result in a maximum pre-tax gain / loss of approximately $2.2 million and $2.4 million as of December 31, 2010 and 2009 respectively.

(iii)

Interest rate risk

Tenaris is subject to interest rate risk on its investment portfolio and its debt.

The following table summarizes the proportions of variable-rate and fixed-rate debt as of each year end.


	As of December 31,
	2010					2009
	Amount in thousands of U.S. dollars		Percentage			Amount in thousands of U.S. dollars		Percentage
Fixed rate		632,766		51	%		287,738		20	%
Variable rate		611,730		49	%		1,159,026		80	%

Total		1,244,496					1,446,764

The Company estimates that, if market interest rates applicable to Tenaris’s borrowings had been 100 basis points higher, then the additional pre-tax loss would have been $10.5 million in 2010 and $20.2 million in 2009. These results exclude the effect of existing interest rate swaps.

F-22

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

A.	Financial Risk Factors (Cont.)

(iii)

Interest rate risk (Cont.)

In order to partially hedge future interest payments related to long-term debt, Tenaris has entered into interest rate swaps and swaps with an embedded knock-in option (See Note 25). All of Tenaris’ interest rate derivatives are designated for hedge accounting. Interest differentials earned on these contracts are recorded to on the interest expenses line at the same pace that interests are accrued on the underlying debt, thus discharging the equity reserve. The outstanding amount of interest rate swaps (notional of $350 million) expires between April and June, 2011 and Tenaris has already fixed the reference rate for the remaining period.

Tenaris estimates that, if market interest rates applicable to the hedged borrowings had been 100 basis point higher, then an additional pre-tax gain of $2.4 million and $10.1 million would have been recorded in 2010 and 2009, partially offsetting the losses to Tenaris’s borrowings estimated above.

Tenaris estimates that the impact of a decrease of 100 basis points in the reference interest rates on the outstanding interest rate derivatives with all other variables held constant, would not have an impact in the equity reserve in 2010 as compared with an impact of $3.3 million for 2009.

Tenaris exposure to interest risk associated with its debt is also mitigated by its investment portfolio. Tenaris estimates that, if interest rates on the benchmark rates for Tenaris portfolio had been 100 basis points higher, then the additional pre-tax gain would have been $9.4 million in 2010 and $12.5 million in 2009, helping offset the net losses to Tenaris’s borrowing costs.

(iv)

Credit risk

Credit risk arises from cash and cash equivalents, deposits with banks and financial institutions, as well as credit exposures to customers, including outstanding receivables and committed transactions. The Company actively monitors the creditworthiness of its treasury and derivative counterparties in order to minimize its credit risk.

There is no significant concentration of credit risk from customers. No single customer comprised more than 10% of Tenaris’ net sales in 2010 and 2009.

Tenaris’ credit policies related to sales of products and services are designed to identify customers with acceptable credit history, and to allow Tenaris to require the use of credit insurance, letters of credit and other instruments designed to minimize credit risks whenever deemed necessary. Tenaris maintains allowances for impairment for potential credit losses (See Section II J).

As of December 31, 2010 trade receivables amount to $1,421.6 million. These trade receivables have guarantees under letter of credit and other bank guarantees of $137.2 million, credit insurance of $475.8 million and other guarantees of $2.7 million.

As of December 31, 2010 trade receivables amounting to $246.0 million were past due but not impaired. These relate to a number of customers for whom there is no recent history of default.

The amount of the allowance for doubtful accounts was $20.8 million as of December 31, 2010. This allowance for doubtful accounts and the existing guarantees are sufficient to cover doubtful overdue trade receivables.

(v)

Counterparty risk

Tenaris has investment guidelines with specific parameters to limit issuer risk on marketable securities. Counterparties for derivatives and cash transactions are limited to high credit quality financial institutions, normally investment grade.

More than 92.9% of Tenaris’ liquid financial assets correspond to Investment Grade-rated instruments as of December 31, 2010, in comparison with more than 97.5% as of December 31,2009.

F-23

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

A.	Financial Risk Factors (Cont.)

(vi)

Liquidity risk

Tenaris financing strategy aims to maintain adequate financial resources and access to additional liquidity. During 2010, Tenaris has counted on cash flows from operations as well as additional bank financing to fund its transactions.

Management maintains sufficient cash and marketable securities to finance normal operations and believes that Tenaris also has appropriate access to market for short-term working capital needs.

Tenaris has a conservative approach to the management of its liquidity, which consists of cash in banks, liquidity funds and short-term investments with a maturity of less than three months at the date of purchase.

Tenaris holds primarily investments in money market funds and variable or fixed-rate securities from investment grade issuers. Tenaris holds its cash and cash equivalents primarily in U.S. dollars. As of December 31, 2010 and 2009, U.S. dollar denominated liquid assets represented around 84% and 82% of total liquid financial assets respectively. Liquid financial assets as a whole (comprising cash and cash equivalents and other current investments) were 10.6% of total assets at the end of 2010 compared to 15.8% at the end of 2009.

B.	Financial instruments by category

The accounting policies for financial instruments have been applied to the line items below:


	Assets at fair value through profit and loss		Loans and receivables		Available for sale		Total
December 31, 2010
Assets as per statement of financial position
Derivative financial instruments		31,537		—		—		31,537
Trade receivables		—		1,421,642		—		1,421,642
Other receivables		—		115,469		—		115,469
Available for sale assets		—		—		21,572		21,572
Other investments		719,816		—		—		719,816
Cash and cash equivalents		843,861		—		—		843,861

Total		1,595,214		1,537,111		21,572		3,153,897


	Liabilities at fair value through profit and loss		Other financial liabilities		Total
December 31, 2010
Liabilities as per statement of financial position
Borrowings		—		1,244,496		1,244,496
Derivative financial instruments		11,972		—		11,972
Trade and other payables (*)		—		852,678		852,678

Total		11,972		2,097,174		2,109,146


	Assets at fair value through profit and loss		Loans and receivables		Available for sale		Total
December 31, 2009
Assets as per statement of financial position
Derivative financial instruments		16,873		—		—		16,873
Trade receivables		—		1,310,302		—		1,310,302
Other receivables		—		102,348		—		102,348
Available for sale assets		—		—		21,572		21,572
Other investments		613,842		—		—		613,842
Cash and cash equivalents		1,542,829		—		—		1,542,829

Total		2,173,544		1,412,650		21,572		3,607,766

F-24

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

B.	Financial instruments by category (Cont.)


	Liabilities at fair value through profit and loss		Other financial liabilities		Total
December 31, 2009
Liabilities as per statement of financial position
Borrowings		—		1,446,764		1,446,764
Derivative financial instruments		23,990		—		23,990
Trade and other payables (*)		—		596,897		596,897

Total		23,990		2,043,661		2,067,651

(*)	The maturity of most of trade payables is of one year or less.

C.	Fair value by hierarchy

Effective 1 January 2009, Tenaris adopted the amendment to IFRS 7 for financial instruments that are measured in the statement of financial position at fair value, which requires disclosure of fair value measurements by level of the following fair value measurement hierarchy:

Level 1- Quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2- Inputs other than quoted prices included within level 1 that are observable for the asset or liability, either directly (that is, as prices) or indirectly (that is, derived from prices).

Level 3- Inputs for the asset or liability that are not based on observable market data (that is, unobservable inputs).

The following table presents the assets and liabilities that are measured at fair value at 31 December 2010 and 2009.


	Level 1		Level 2		Level 3		Total
December 31, 2010
Assets
Cash and cash equivalents		843,861		—		—		843,861
Other investments		540,298		163,347		16,171		719,816
Foreign exchange derivatives contracts		—		28,259		—		28,259
Embedded derivative (See Note 25)		—		—		3,278		3,278
Available for sale assets (**)		—		—		21,572		21,572

Total		1,384,159		191,606		41,021		1,616,786

Liabilities
Foreign exchange derivatives contracts		—		6,613		—		6,613
Interest rate derivatives financial instruments		—		5,359		—		5,359

Total		—		11,972		—		11,972


	Level 1		Level 2		Level 3		Total
December 31, 2009
Assets
Cash and cash equivalents		1,542,829		—		—		1,542,829
Other investments		456,209		146,948		10,685		613,842
Foreign exchange derivatives contracts		—		16,873		—		16,873
Available for sale assets (**)		—		—		21,572		21,572

Total		1,999,038		163,821		32,257		2,195,116

Liabilities
Foreign exchange derivatives contracts		—		3,434		—		3,434
Interest rate derivatives financial instruments		—		17,738		—		17,738
Embedded derivative (See Note 25)		—		—		2,818		2,818

Total		—		21,172		2,818		23,990

(**)	For further detail regarding Available for sale assets, see Note 32.

F-25

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

C.	Fair value by hierarchy (Cont.)

The fair value of financial instruments traded in active markets is based on quoted market prices at the reporting date. A market is regarded as active if quoted prices are readily and regularly available from an exchange, dealer, broker, industry group, pricing service, or regulatory agency, and those prices represent actual and regularly occurring market transactions on an arm’s length basis. The quoted market price used for financial assets held by Tenaris is the current bid price. These instruments are included in level 1 and comprise primarily corporate and sovereign debt securities.

The fair value of financial instruments that are not traded in an active market (such as certain debt securities, certificates of deposits with original maturity of more than three months, forward and interest rate derivative instruments) is determined by using valuation techniques. These valuation techniques maximize the use of observable market data where it is available and rely as little as possible on entity specific estimates. If all significant inputs required to value an instrument are observable, the instrument is included in level 2.

If one or more of the significant inputs is not based on observable market data, the instruments are included in level 3. The following table presents the changes in level 3 assets and liabilities:


	Year ended December 31,
	2010			2009
	Assets / Liabilities
Net assets (liabilities) at the beginning of the year		29,439			(11,030	)
Available for sale assets		—			11,578
Gain for the year		6,002			27,771
Reclassifications		5,603			1,000
Currency translation adjustment		(23	)		120

Net assets at the end of the year		41,021			29,439

D.	Fair value estimation

Financial assets or liabilities classified as assets at fair value through profit or loss are measured under the framework established by the IASB accounting guidance for fair value measurements and disclosures.

The fair values of quoted investments are based on current bid prices. If the market for a financial asset is not active or no market is available, fair values are established using standard valuation techniques.

For the purpose of estimating the fair value of Cash and cash equivalents and Other Investments expiring in less than ninety days from the measurement date, the Company usually chooses to use the historical cost because the carrying amount of financial assets and liabilities with maturities of less than ninety days approximates to their fair value.

The fair value of all outstanding derivatives is determined using specific pricing models that include inputs that are observable in the market or can be derived from or corroborated by observable data.

Borrowings are comprised primarily of fixed rate debt and variable rate debt with a short term portion where interest has already been fixed. They are classified under loans and receivables and measured at their carrying amount. Tenaris estimates that the fair value of its main financial liabilities is approximately 99.5% of its carrying amount including interests accrued in 2010 as compared with 99.0% in 2009. Tenaris estimates that a change of 50 basis points in the reference interest rates would have an estimated impact of less than 0.1% in the fair value of borrowings as of December 31, 2010 and 0.1% in 2009. Fair values were calculated using standard valuation techniques for floating rate instruments and comparable market rates for discounting flows.

F-26

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

E.	Accounting for derivative financial instruments and hedging activities

Derivative financial instruments are initially recognized in the statement of financial position at fair value through profit and loss on the date a derivative contract is entered into and are subsequently remeasured at fair value. Specific tools are used for calculation of each instrument’s fair value and these tools are tested for consistency on a quarterly basis. Market rates are used for all pricing operations. These include exchange rates, deposit rates and other discount rates matching the nature of each underlying risk.

As a general rule, Tenaris recognizes the full amount related to the change in fair value of derivative financial instruments in Financial results in the Consolidated Income Statement.

Tenaris designates certain derivatives as hedges of a particular risk associated with recognized assets or liabilities or highly probable forecast transactions. These transactions (mainly currency forward contracts on highly probable forecast transactions and interest rate swaps) are classified as cash flow hedges. The effective portion of the fair value of derivatives that are designated and qualify as cash flow hedges is recognized in equity. Amounts accumulated in equity are recognized in the income statement in the same period than the offsetting losses and gains on the hedged item. The gain or loss relating to the ineffective portion is recognized immediately in the income statement. The fair value of Tenaris derivative financial instruments (assets or liabilities) continues to be reflected on the statement of financial position.

For transactions designated and qualifying for hedge accounting, Tenaris documents at the inception of the transaction the relationship between hedging instruments and hedged items, as well as its risk management objectives and strategy for undertaking various hedge transactions. At December 31, 2010, the effective portion of designated cash flow hedges amounts to $8.9 million and is included in Other Reserves in equity (see Note 25 Derivative financial instruments). Tenaris also documents its assessment on an ongoing basis, of whether the derivatives that are used in hedging transactions are highly effective in offsetting changes in the fair value or cash flow of hedged items.

The fair values of various derivative instruments used for hedging purposes are disclosed in Note 25. Movements in the hedging reserve included within Other Reserves in equity are also shown in Note 25. The full fair value of a hedging derivative is classified as a non current asset or liability when the remaining hedged item is more than 12 months and as a current asset or liability when the remaining maturity of the hedged item is less than 12 months.

F-27

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

IV. OTHER NOTES TO THE CONSOLIDATED FINANCIAL STATEMENTS

(In the notes all amounts are shown in thousands of U.S. dollars, unless otherwise stated)

1	Segment information

Reportable operating segments


(all amounts in thousands of U.S. dollars)	Tubes			Projects			Other			Unallocated (**)		Total Continuing operations			Total Discontinued operations (*)
Year ended December 31, 2010
Net sales		6,676,429			428,771			606,398			—		7,711,598			—
Cost of sales		(3,975,935	)		(286,415	)		(438,460	)		—		(4,700,810	)		—

Gross profit		2,700,494			142,356			167,938			—		3,010,788			—
Selling, general and administrative expenses		(1,365,757	)		(80,485	)		(69,628	)		—		(1,515,870	)		—
Other operating income (expenses), net		68,601			1,817			8,211			—		78,629			—

Operating income		1,403,338			63,688			106,521			—		1,573,547			—
Segment assets		12,215,642			1,018,607			436,655			693,427		14,364,331			—
Segment liabilities		3,453,083			259,691			100,977			—		3,813,751			—
Capital expenditures		799,724			42,740			4,852			—		847,316			—
Depreciation and amortization		471,717			19,843			15,342			—		506,902			—
Impairment reversal		67,293			—			—			—		67,293			—

Year ended December 31, 2009
Net sales		6,670,929			986,548			491,843			—		8,149,320			18,558
Cost of sales		(3,769,895	)		(704,238	)		(390,789	)		—		(4,864,922	)		(31,866	)

Gross profit		2,901,034			282,310			101,054			—		3,284,398			(13,308	)
Selling, general and administrative expenses		(1,325,441	)		(75,841	)		(72,509	)		—		(1,473,791	)		(9,540	)
Other operating income (expenses), net		1,249			2,165			(414	)		—		3,000			(179	)

Operating income		1,576,842			208,634			28,131			—		1,813,607			(23,027	)
Segment assets		11,365,861			971,783			521,520			624,144		13,483,308			—
Segment liabilities		3,463,294			234,549			64,629			—		3,762,472			—
Capital expenditures		425,545			30,820			4,562			—		460,927			—

Depreciation and amortization		464,841			18,593			21,403			—		504,837			27

Year ended December 31, 2008
Net sales		10,010,066			1,270,915			706,779			—		11,987,760			242,464
Cost of sales		(5,300,257	)		(883,534	)		(514,494	)		—		(6,698,285	)		(158,616	)

Gross profit		4,709,809			387,381			192,285			—		5,289,475			83,848
Selling, general and administrative expenses		(1,549,466	)		(136,923	)		(101,563	)		—		(1,787,952	)		(44,858	)
Other operating income (expenses), net		(333,302	)		(1,415	)		(41,156	)		—		(375,873	)		(109,770	)

Operating income		2,827,041			249,043			49,566			—		3,125,650			(70,780	)
Segment assets		13,154,333			941,519			477,853			527,007		15,100,712			—
Segment liabilities		5,860,736			377,497			160,592			—		6,398,825			—
Capital expenditures		412,298			17,284			13,656			—		443,238			3,429

Depreciation and amortization		481,953			20,084			22,426			—		524,463			17,436
Impairment charge		354,905			—			39,347			—		394,252			108,647

Transactions between segments, which were eliminated in consolidation, include sales of scrap and pipe protectors from the Other segment to the Tubes segment for $204,478, $113,408 and $191,036 in 2010, 2009 and 2008, respectively.

F-28

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

1	Segment information (Cont.)

Geographical information


(all amounts in thousands of U.S. dollars)	North America		South America		Europe		Middle East & Africa		Far East & Oceania		Unallocated (**)		Total Continuing operations		Total Discontinued operations (*)
Year ended December 31, 2010
Net sales		3,295,081		1,911,824		805,617		1,264,610		434,466		—		7,711,598		—
Total assets		7,316,794		3,106,212		2,292,675		347,492		607,731		693,427		14,364,331		—
Trade receivables		430,184		332,263		315,443		259,434		84,318		—		1,421,642		—
Property, plant and equipment, net		1,883,992		862,433		837,764		34,047		162,344		—		3,780,580		—
Capital expenditures		561,782		123,586		130,232		20,839		10,877		—		847,316		—

Depreciation and amortization		258,428		104,992		115,776		1,215		26,491		—		506,902		—

Year ended December 31, 2009
Net sales		2,891,523		2,285,677		866,692		1,623,541		481,887		—		8,149,320		18,558
Total assets		6,722,816		2,790,249		2,469,042		386,242		490,815		624,144		13,483,308		—
Trade receivables		344,548		361,976		235,708		327,924		40,146		—		1,310,302		—
Property, plant and equipment, net		1,387,146		826,028		864,612		14,357		162,444		—		3,254,587		—
Capital expenditures		261,781		99,521		68,394		5,580		25,651		—		460,927		—

Depreciation and amortization		272,677		100,089		108,770		1,367		21,934		—		504,837		27

Year ended December 31, 2008
Net sales		4,809,330		2,815,578		1,824,684		1,810,695		727,473		—		11,987,760		242,464
Total assets		7,083,508		3,460,729		3,033,555		436,179		559,734		527,007		15,100,712		—
Trade receivables		786,867		432,987		379,794		386,786		136,862		—		2,123,296		—
Property, plant and equipment, net		1,180,738		796,009		861,892		10,128		134,104		—		2,982,871		—
Capital expenditures		159,990		141,174		101,050		6,705		34,319		—		443,238		3,429

Depreciation and amortization		298,240		99,261		111,040		1,246		14,676		—		524,463		17,436

There are no revenues from external customers attributable to the Company’s country of incorporation (Luxembourg). For geographical information purposes, “North America” comprises Canada, Mexico and the USA; “South America” comprises principally Argentina, Brazil, Colombia, Ecuador, Peru and Venezuela; “Europe” comprises principally Italy, Norway and Romania; “Middle East and Africa” comprises principally Algeria, Egypt, Kazakhstan, Kuwait, Nigeria, Saudi Arabia and United Arab Emirates; “Far East and Oceania” comprises principally Australia, China, Indonesia and Japan.

(*) Corresponds to the Venezuelan Companies (years 2009 and 2008) and Pressure Control (year 2008) operations (See Notes 29 and 32).

(**) Includes Investments in associated companies and Available for sale assets for $21.6 million in 2010 and 2009 (See Note 32).

F-29

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

2	Cost of sales


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Inventories at the beginning of the year		1,687,059			3,091,401			2,598,856
Plus: Charges of the year
Raw materials, energy, consumables and other		3,690,900			1,948,596			5,430,147
Increase in inventory due to business combinations		—			53,541			—
Services and fees		329,687			240,346			395,104
Labor cost		941,375			737,883			927,132
Depreciation of property, plant and equipment		290,299			263,634			282,407
Amortization of intangible assets		3,351			2,813			2,170
Maintenance expenses		174,966			145,413			203,207
Provisions for contingencies		—			1,984			12
Allowance for obsolescence		(34,522	)		89,041			(2,055	)
Taxes		7,121			6,799			8,655
Other		70,958			46,122			102,667

		5,474,135			3,536,172			7,349,446
Deconsolidation / Transfer to assets held for sale		—			(43,726	)		—
Less: Inventories at the end of the year		(2,460,384	)		(1,687,059	)		(3,091,401	)

		4,700,810			4,896,788			6,856,901
From Discontinued operations		—			(31,866	)		(158,616	)

		4,700,810			4,864,922			6,698,285

3	Selling, general and administrative expenses


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Services and fees		207,427			207,202			214,010
Labor cost		454,127			407,235			447,150
Depreciation of property, plant and equipment		12,506			14,524			12,096
Amortization of intangible assets		200,746			223,893			245,226
Commissions, freight and other selling expenses		420,417			368,451			571,823
Provisions for contingencies		26,430			33,880			37,101
Allowances for doubtful accounts		(17,361	)		13,837			13,823
Taxes		120,591			114,976			167,686
Other		90,987			99,333			123,895

		1,515,870			1,483,331			1,832,810
From Discontinued operations		—			(9,540	)		(44,858	)

		1,515,870			1,473,791			1,787,952

4	Labor costs (included in Cost of sales and in Selling, general and administrative expenses)


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010		2009			2008
Wages, salaries and social security costs		1,359,994		1,113,757			1,347,667
Employees’ severance indemnity		12,850		13,436			19,168
Pension benefits - defined benefit plans		8,795		8,734			8,161
Employee retention and long term incentive program		13,863		9,191			(714	)

		1,395,502		1,145,118			1,374,282
From Discontinued operations		—		(23,024	)		(55,835	)

		1,395,502		1,122,094			1,318,447

At the year-end, the number of employees was 25,422 in 2010, 22,591 in 2009 and 23,873 in 2008.

F-30

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

5	Other operating items


		Year ended December 31,
	(all amounts in thousands of U.S. dollars)	2010		2009		2008
(i)	Other operating income
	Reimbursement from insurance companies and other third parties agreements		9,810		76		10,511
	Net income from other sales		1,955		2,130		23,704
	Net rents		2,793		3,538		1,971
	Impairment reversal (1)		67,293		—		—
	Other		3,807		1,750		—

			85,658		7,494		36,186
	From Discontinued operations		—		179		(1,046	)

			85,658		7,673		35,140

(ii)	Other operating expenses
	Contributions to welfare projects and non-profits organizations		3,304		2,758		2,871
	Provisions for legal claims and contingencies		2,741		—		(22	)
	Loss on fixed assets and material supplies disposed / scrapped		352		27		461
	Loss from natural disasters		—		—		1,743
	Allowance for doubtful receivables		632		1,888		(184	)
	Losses on prepayment to suppliers		—		—		3,830
	Impairment charge (2)		—		—		502,899
	Other		—		—		10,231

			7,029		4,673		521,829
	From Discontinued operations		—		—		(110,816	)

			7,029		4,673		411,013

(1) Impairment reversal

In 2010, the Company reversed the impairment registered in 2008 corresponding to Prudential CGU’s Customer Relationships as there has been an improvement in the outlook of the economic and competitive conditions for the Canadian oil and gas market compared to that foreseen at the end of 2008. The main key assumptions that Tenaris considered were the expected oil and natural gas prices evolution and the level of drilling activity in Canada. Tenaris use the average number of active oil and gas drilling rigs, or rig count, as published by Baker Hughes, as a general indicator of activity in the oil and gas sector. The rig count in Canada increased 59% from an annual average of 221 in 2009 to an annual average of 351 in 2010. In this environment, Tenaris expects that its competitive conditions and activity levels will continue to improve.

The recoverable amount of the Prudential (Canada) CGU was estimated based on the value in use. Value in use was calculated in the same way as that for CGU containing goodwill (see Note 11). The discount rate used was based on a weighted average cost of capital (WACC) of 10.7%.

The Company has increased the carrying amount of the Customer Relationships by $67.3 million to its recoverable amount which in accordance with IAS 36 is the one that would have been determined (net of amortization) had no impairment loss been recognized for the asset in the year 2008. In addition, the Company recognized the respective deferred tax effect of $16.9 million in Income tax in the Consolidated Income Statement.

(2) Impairment charge

F-31

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

5	Other operating items (Cont.)

Impairment charge (Cont.)

These impairment charges primarily arose in connection with Tenaris’s operations in the United States and Canada, mainly due to recessionary environment, the abrupt decline in oil and gas prices, and its impact on drilling activity and therefore on demand for OCTG products. In particular, the main factors that precipitated the impairment charges in the United States and Canada were the steep reduction in the average number of active oil and drilling rigs, or rig count, in these markets, which are sensitive to North American gas prices and the worldwide financial and economic crisis. In 2008, North American gas prices rose rapidly during the first half of the year, peaking in excess of $12 per million BTU, before falling even more steeply to levels below $4 per million BTU. This collapse in North American gas prices had an immediate effect on the U.S. and Canadian rig counts. The rig count in the United States, which is more sensitive to North American gas prices, increased 6% in 2008, compared to 2007, rising steadily in the first part of the year to peak at 2,031 during the month of September and falling in the fourth quarter to end the year at 1,623 (a 20% decrease over that period); by the end of March 2009, rig count in the United States had fallen to 1,039, an additional 36% decrease. This decrease in drilling activity and the high level of inventories put downward pressure on the tubes price. Accordingly, in December 2008, the Company expected that the decrease in apparent demand of OCTG products in North America would continue, due to the decline in oil and gas drilling activity and its customers’ efforts to reduce inventories.

At December 31, 2008, the carrying value of the total remaining assets (in thousand of U.S. dollars) of the impaired businesses was:


	Total Assets before impairment		Impairment			Total Assets after *impairment ()**
Oil Country Tubular Goods (“OCTG”)		2,506,332		(192,707	)		2,313,625
Prudential		736,772		(138,466	)		598,306
Coiled Tubing		259,722		(23,732	)		235,990
Electric Conduits		250,106		(39,347	)		210,759

Total U.S. and Canadian Operations		3,752,932		(394,252	)		3,358,680

Venezuelan Operations		266,758		(108,647	)		158,111

Total		4,019,690		(502,899	)		3,516,791

(*)	These amounts include total assets of the operation (e.g. short and long lived assets), including goodwill and other intangible assets at December 31, 2008.

F-32

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

6	Financial results


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Interest income		32,855			30,986			49,114
Interest expense (*)		(64,103	)		(121,881	)		(185,851	)

Interest net		(31,248	)		(90,895	)		(136,737	)
Net foreign exchange transaction results		(26,581	)		(73,015	)		(120,515	)
Foreign exchange derivatives contracts results (**)		7,183			10,467			35,993
Other		(1,907	)		(2,564	)		(19,738	)

Other financial results		(21,305	)		(65,112	)		(104,260	)

Net financial results		(52,553	)		(156,007	)		(240,997	)
From Discontinued operations		—			4,307			9,973

		(52,553	)		(151,700	)		(231,024	)

Items included in this note for the years 2009 and 2008 differs from its corresponding line in the Consolidated Income Statement because they include results from discontinued operations.

(*) Includes losses on interest rate swaps of $15.6 million, $21.7 million and $9.7 million, in 2010, 2009 and 2008, respectively. As previously described in “Section III.A. Financial Risk Factors”, in order to partially hedge future interest payments related to long-term debt, Tenaris has entered into interest rate swaps and swaps with an embedded knock-in options. A knock-in swap is a type of barrier option, which is activated if the reference rate reaches a set level (“knock in”) at the end of a certain period. A total notional amount of $500 million was covered by these instruments which coverage has begun between April and June 2009, and expires between April and June 2011. Between September and December 2009, a Tenaris subsidiary partially prepaid a syndicated loan facility which was part of the underlying risk. Accordingly, Tenaris derecognized the corresponding portion of its hedge reserve designation (notional of $150 million) on interest rate swaps derivatives recording a loss of $8.2 million, included in the total amount of $21.7 million of interest rate swaps losses for the year ended December 31, 2009.

(**) Includes gains on identified embedded derivatives of $6.1 million, $27.9 million and a loss of $40.7 million for 2010, 2009 and 2008, respectively.

7	Equity in earnings of associated companies


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
From associated companies		70,553			87,159			89,556
Loss on sale of associated companies and other		(496	)		(980	)		—

		70,057			86,179			89,556
From Discontinued operations		—			862			(133	)

		70,057			87,041			89,423

8	Income tax


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Current tax		395,183			541,818			1,255,759
Deferred tax		58,848			(32,962	)		(244,331	)

		454,031			508,856			1,011,428
Effect of currency translation on tax base (a)		(4,027	)		4,297			10,704

		450,004			513,153			1,022,132
From Discontinued operations		—			58			(6,798	)

		450,004			513,211			1,015,334

F-33

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

8	Income tax (Cont.)

The tax on Tenaris’ income before tax differs from the theoretical amount that would arise using the tax rate in each country as follows:


	Year ended December 31,
(all amounts in thousands of U.S. dollars)	2010			2009			2008
Income before income tax		1,591,051			1,748,948			2,984,049

Tax calculated at the tax rate in each country		440,882			525,844			918,200
Non taxable income / Non deductible expenses (b)		(2,948	)		(25,760	)		85,950
Changes in the tax rates		(17	)		837			(4,476	)
Effect of currency translation on tax base (a)		(4,027	)		4,297			10,704
Effect of taxable exchange differences		16,185			8,906			8,878
Utilization of previously unrecognized tax losses		(71	)		(913	)		(3,922	)

Tax charge		450,004			513,211			1,015,334

(a)

Tenaris applies the liability method to recognize deferred income tax expense on temporary differences between the tax bases of assets and their carrying amounts in the financial statements. By application of this method, Tenaris recognizes gains and losses on deferred income tax due to the effect of the change in the value of the Argentine peso on the tax bases of the fixed assets of its Argentine subsidiaries, which have the U.S. dollar as their functional currency. These gains and losses are required by IFRS even though the devalued tax basis of the relevant assets will result in a reduced dollar value of amortization deductions for tax purposes in future periods throughout the useful life of those assets. As a result, the resulting deferred income tax charge does not represent a separate obligation for Tenaris that is due and payable in any of the relevant periods.

(b)	Includes the effect of the impairment charge for 2008.

9	Earnings and dividends per share

Earnings per share are calculated by dividing the net income attributable to equity holders of the Company by the daily weighted average number of ordinary shares in issue during the year.


	Year ended December 31,
	2010			2009			2008
Net income attributable to equity holders		1,127,367			1,161,555			2,124,802
Weighted average number of ordinary shares in issue (thousands)		1,180,537			1,180,537			1,180,537
Basic and diluted earnings per share ( U.S. dollars per share)		0.95			0.98			1.80
Basic and diluted earnings per ADS ( U.S. dollars per ADS) (*)		1.91			1.97			3.60

Dividends paid		(401,383	)		(507,631	)		(448,604	)
Basic and diluted dividends per share (U.S. dollars per share)		0.34			0.43			0.38
Basic and diluted dividends per ADS (U.S. dollars per ADS) (*)		0.68			0.86			0.76

Result for discontinued operations attributable to equity holders		—			(16,454	)		361,442
Basic and diluted earnings per share (U.S. dollars per share)		—			(0.01	)		0.31
Basic and diluted earnings per ADS (U.S. dollars per ADS) (*)		—			(0.03	)		0.61

(*)	Each ADS equals to two shares

On November 4, 2010, the Company’s board of directors approved the payment of an interim dividend of $0.13 per share ($0.26 per ADS), or approximately $153 million, on November 25, 2010, with an ex-dividend date of November 22, 2010.

On June 2, 2010, the Company’s shareholders approved an annual dividend in the amount of $0.34 per share ($0.68 per ADS). The amount approved included the interim dividend previously paid in November 2009, in the amount of $0.13 per share ($0.26 per ADS), or approximately $153 million. The balance, amounting to $0.21 per share ($0.42 per ADS), was paid on June 24, 2010. In the aggregate, the interim dividend paid in November 2009 and the balance paid in June 2010 amounted to approximately $401 million.

On June 3, 2009, the Company’s shareholders approved an annual dividend in the amount of $0.43 per share ($0.86 per ADS). The amount approved included the interim dividend previously paid in November 2008, in the amount of $0.13 per share ($0.26 per ADS), or approximately $153 million. The balance, amounting to $0.30 per share ($0.60 per ADS), was paid on June 25, 2009. In the aggregate, the interim dividend paid in November 2008 and the balance paid in June 2009 amounted to approximately $507 million.

F-34

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

9	Earnings and dividends per share (Cont.)

On June 4, 2008, the Company’s shareholders approved an annual dividend in the amount of $0.38 per share ($0.76 per ADS). The amount approved included the interim dividend previously paid in November 2007, in the amount of $0.13 per share ($0.26 per ADS), or approximately $153 million. The balance, amounting to $0.25 per share ($0.50 per ADS), was paid on June 26, 2008. In the aggregate, the interim dividend paid in November 2007 and the balance paid in June 2008 amounted to approximately $449 million.

10	Property, plant and equipment, net


	Land, building and improvements			Plant and production equipment			Vehicles, furniture and fixtures			Work in progress			Spare parts and equipment			Total
Year ended December 31, 2010
Cost
Values at the beginning of the year		758,489			6,455,124			187,557			451,019			35,793			7,887,982
Translation differences		16,159			(3,095	)		2,173			21,068			(603	)		35,702
Additions		28,780			2,535			2,921			783,325			2,255			819,816
Disposals / Consumptions		(1,455	)		(26,080	)		(4,663	)		—			(1,476	)		(33,674	)
Transfers / Reclassifications		48,892			241,399			26,580			(325,287	)		954			(7,462	)

Values at the end of the year		850,865			6,669,883			214,568			930,125			36,923			8,702,364

Depreciation
Accumulated at the beginning of the year		183,823			4,310,819			125,945			—			12,808			4,633,395
Translation differences		4,337			4,704			1,470			—			(440	)		10,071
Depreciation charge		22,697			256,182			22,483			—			1,443			302,805
Transfers / Reclassifications		(225	)		103			189			—			(139	)		(72	)
Disposals / Consumptions		(493	)		(20,008	)		(3,772	)		—			(142	)		(24,415	)

Accumulated at the end of the year		210,139			4,551,800			146,315			—			13,530			4,921,784

At December 31, 2010		640,726			2,118,083			68,253			930,125			23,393			3,780,580


	Land, building and improvements			Plant and production equipment			Vehicles, furniture and fixtures			Work in progress			Spare parts and equipment			Total
Year ended December 31, 2009
Cost
Values at the beginning of the year		689,173			6,238,423			195,628			235,857			38,450			7,397,531
Translation differences		30,682			155,286			8,091			13,967			1,795			209,821
Additions		2,741			3,613			1,194			427,170			5,749			440,467
Disposals / Consumptions		(3,358	)		(10,591	)		(3,750	)		—			(7,850	)		(25,549	)
Increase due to business acquisitions		12,083			11,507			46			487			—			24,123
Transfers / Reclassifications		31,603			194,760			(12,859	)		(218,954	)		2,886			(2,564	)
Deconsolidation / Transfers to Available for sale assets		(4,435	)		(137,874	)		(793	)		(7,508	)		(5,237	)		(155,847	)

Values at the end of the year		758,489			6,455,124			187,557			451,019			35,793			7,887,982

Depreciation and impairment
Accumulated at the beginning of the year		158,443			4,136,038			99,113			7,200			13,866			4,414,660
Translation differences		9,419			84,364			6,684			—			252			100,719
Depreciation charge		19,350			232,927			24,529			—			1,352			278,158
Transfers / Reclassifications		194			1,183			(1,377	)		—			—			—
Disposals / Consumptions		(33	)		(7,884	)		(2,420	)		—			(18	)		(10,355	)
Deconsolidation / Transfer to Available for sale assets		(3,550	)		(135,809	)		(584	)		(7,200	)		(2,644	)		(149,787	)

Accumulated at the end of the year		183,823			4,310,819			125,945			—			12,808			4,633,395

At December 31, 2009		574,666			2,144,305			61,612			451,019			22,985			3,254,587

Property, plant and equipment include capitalized interests for net amounts at December 31, 2010 and 2009 of $3,388 (out of which $1,390 were capitalized during the year 2010) and $3,371, respectively.

F-35

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

11	Intangible assets, net


	Information system projects			Licenses, patents and *trademarks ()**			Goodwill		Customer relationships			Total
Year ended December 31, 2010
Cost
Values at the beginning of the year		232,184			498,319			2,142,762		2,045,672			4,918,937
Translation differences		1,082			1,590			4,304		25,643			32,619
Additions		27,188			312			—		—			27,500
Transfers / Reclassifications		2,513			(685	)		—		—			1,828
Disposals		(21,851	)		(1,374	)		—		—			(23,225	)

Values at the end of the year		241,116			498,162			2,147,066		2,071,315			4,957,659

Amortization and impairment
Accumulated at the beginning of the year		160,446			185,070			338,092		564,409			1,248,017
Translation differences		492			(213	)		4,304		9,592			14,175
Amortization charge		20,005			30,106			—		153,986			204,097
Transfers / Reclassifications		541			(500	)		—		—			41
Impairment reversal		—			—			—		(67,293	)		(67,293	)
Disposals		(21,823	)		(1,371	)		—		—			(23,194	)

Accumulated at the end of the year		159,661			213,092			342,396		660,694			1,375,843

At December 31, 2010		81,455			285,070			1,804,670		1,410,621			3,581,816


	Information system projects			Licenses, patents and *trademarks ()**			Goodwill		Customer relationships			Total
Year ended December 31, 2009
Cost
Values at the beginning of the year		203,612			495,657			2,130,799		1,975,254			4,805,322
Translation differences		6,679			3,170			11,963		70,418			92,230
Additions		20,385			75			—		—			20,460
Deconsolidation / Transfers to Available for sale assets		(430	)		—			—		—			(430	)
Transfers / Reclassifications		2,564			—			—		—			2,564
Disposals		(626	)		(583	)		—		—			(1,209	)

Values at the end of the year		232,184			498,319			2,142,762		2,045,672			4,918,937

Amortization and impairment
Accumulated at the beginning of the year		133,974			130,167			325,440		388,754			978,335
Translation differences		5,713			204			12,652		24,500			43,069
Amortization charge		20,815			54,736			—		151,155			226,706
Disposals		(56	)		(37	)		—		—			(93	)

Accumulated at the end of the year		160,446			185,070			338,092		564,409			1,248,017

At December 31, 2009		71,738			313,249			1,804,670		1,481,263			3,670,920

(*)	Includes Proprietary Technology.

The geographical allocation of goodwill was $1,614.5 million for North America, $189.4 million for South America and $0.8 million for Europe for the years ended December 31, 2010 and 2009.

F-36

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

11	Intangible assets, net (Cont.)

The carrying amount of goodwill allocated by CGU, as of December 31, 2010, was as follows:

(All amounts in million US Dollar)


As of December 31,2010	Tubes Segment						Other Segment
CGU	Maverick Acquisition		Hydril Acquisition		Other		Maverick Acquisition		Total
OCTG (USA and Colombia)		721.5								721.5
Tamsa (Hydril and other)				345.9		19.4				365.3
Siderca (Hydril and other)				265.0		93.3				358.3
Hydril				309.0						309.0
Electric Conduits								45.8		45.8
Coiled Tubing		4.0								4.0
Other						0.8				0.8

Total		725.5		919.9		113.5		45.8		1,804.7

Impairment tests

In 2010 and 2009, the CGU’s shown in the previous table (which contain goodwill) were tested for impairment. Additionally the Prudential CGU was tested for impairment reversal. No other CGU was tested for impairment in 2010 and 2009 as no impairment indicators were identified. In 2008, Venezuelan Operations CGU was also tested for impairment as Tenaris identified the presence of impairment indicators.

Tenaris determined that the CGUs with a significant amount of goodwill in comparison to the total amount of goodwill as of December 31, 2010, were: OCTG, Tamsa, Siderca and Hydril, which represented 97.2% of total goodwill.

The value-in-use was used to determine the recoverable amount for all the CGUs with a significant amount of goodwill in comparison to the total amount of goodwill.

Value-in-use is calculated by discounting the estimated cash flows over a five year period based on forecasts approved by management. For the subsequent years beyond the five-year period, a terminal value is calculated based on perpetuity considering a nominal growth rate of 2%. The growth rate considers the long-term average growth rate for the oil and gas industry, the higher demand to offset depletion of existing fields and the Company’s expected market penetration.

Tenaris’s main source of revenue is the sale of products and services to the oil and gas industry, and the level of such sales is sensitive to international oil and gas prices and their impact on drilling activities. The main key assumptions, shared by all four CGUs are oil and natural gas prices evolution and the level of drilling activity. Tenaris uses the average number of active oil and gas drilling rigs, or rig count, as published by Baker Hughes, as a general indicator of activity in the oil and gas sector. In the case of the OCTG CGU, these assumptions are mainly related to the U.S. market. In the case of Tamsa CGU and Siderca CGU, assumptions are mainly related to the countries where they are located, Mexico and Argentina respectively, and to the international markets as both facilities export a large amount of their production. Regarding Hydril CGU, assumptions are mainly related to the worldwide market.

In addition, key assumptions for OCTG CGU, Tamsa CGU and Siderca CGU also include raw materials costs as their production process consists on the transformation of steel into pipes. In the case of Tamsa CGU and Siderca CGU, steel comes from their own steel shops, therefore they consume steelmaking raw materials (e.g., iron ore and metal scrap). In the case of OCTG CGU, the main raw material is hot rolled steel coils. In the case of Hydril CGU, raw material costs are negligible.

For purposes of assessing key assumptions, Tenaris uses external sources of information and management judgment based on past experience.

The discount rates used are based on the respective weighted average cost of capital (WACC) which is considered to be a good indicator of capital cost. For each CGU where assets are allocated, a specific WACC was determined taking into account the industry, country and size of the business. In 2010, the discount rates used were in a range between 9% and 13%.

F-37

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

11	Intangible assets, net (Cont.)

From the CGUs with a significant amount of goodwill assigned in comparison to the total amount of goodwill, Tenaris has determined that the CGU for which a reasonable possible change in a key assumption would cause the CGUs’ carrying amount to exceed its recoverable amount was OCTG CGU.

In OCTG CGU, the recoverable amount calculated based on value in use exceeded carrying value by US$130 million as of December 31, 2010. The main factors that could result in impairment charges in future periods would be an increase in the discount rate/decrease in growth rate used in the Company’s cash flow projections and a deterioration of the business, competitive and economic factors discussed in 2008, such as the cost of raw materials, oil and gas prices, competitive environment, capital expenditure program of Tenaris’ clients and the evolution of the rig count in the U.S. market. As there is a significant interaction among the principal assumptions made in estimating its cash flow projections, the Company believes that a sensitivity analysis that considers changes in one assumption at a time could be potentially misleading. A reduction in cash flows of 6%, a fall in growth rate to 1% or a rise in discount rate of 60 basis points would remove the remaining headroom.

As of December 31, 2010, no cumulative amount of recognized impairment charges are subject to reversal.

2009 Impairment Test

For the 2009 impairment tests, Tenaris considered that the activity levels would continue to recover, with better competitive conditions, and the rig counts and oil and gas prices in North America would be higher than those of 2008. Accordingly, no impairment charge was recorded in 2009 financial statements. The discount rates used for these tests were in a range between 10% and 13%, based on Tenaris’s weighted average cost of capital taking into account the industry, the country and the size of the business.

12	Investments in associated companies


	Year ended December 31,
	2010			2009
At the beginning of the year		602,572			527,007
Translation differences		11,413			(1,302	)
Equity in earnings of associated companies		70,553			87,159
Dividends and distributions received		(14,034	)		(11,420	)
Transfer to Available for sale assets		—			(1,615	)
Acquisitions		302			—
Increase in equity reserves in Ternium		1,049			2,743

At the end of the year		671,855			602,572

The principal associated companies are:


	Country of	Percentage of ownership and voting rights at December 31,						Value at December 31,
Company	incorporation	2010			2009			2010		2009
Ternium S.A.	Luxembourg		11.46	%		11.46	%		651,361		584,389
Others	—		—			—			20,494		18,183

									671,855		602,572

Summarized selected financial information of Ternium, including the aggregated amounts of assets, liabilities, revenues and profit or loss is as follows:


	Ternium S.A.
	2010		2009
Non-current assets		5,579,438		5,250,135
Current assets		5,532,893		5,042,538

Total assets		11,112,331		10,292,673

Non-current liabilities		2,540,594		2,872,667
Current liabilities		1,555,636		1,158,767

Total liabilities		4,096,230		4,031,434

Non-controlling interests		1,135,361		964,897
Revenues		7,382,004		4,958,983
Gross profit		1,716,750		848,613
Income from discontinued operations		—		428,023
Net income for the year attributable to equity holders of the company		622,076		717,400

F-38

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

13	Other investments – non current


	Year ended December 31,
	2010		2009
Deposits with insurance companies		27,421		23,482
Investments in other companies		2,474		2,496
Others		13,697		8,189

		43,592		34,167

14	Receivables – non current


	Year ended December 31,
	2010			2009
Government entities		3,667			4,666
Employee advances and loans		14,631			13,682
Tax credits		18,220			17,575
Receivables from related parties		930			375
Receivables on off- take contract		165			104
Legal deposits		26,687			22,545
Advances to suppliers and other advances		35,530			25,181
Derivative financial instruments		1,853			—
Other		22,552			22,215

		124,235			106,343
Allowances for doubtful accounts (see Note 23 (i))		(3,806	)		(4,725	)

		120,429			101,618

15	Inventories


	Year ended December 31,
	2010			2009
Finished goods		890,313			715,906
Goods in process		576,092			353,367
Raw materials		443,265			297,834
Supplies		429,409			378,876
Goods in transit		272,744			125,847

		2,611,823			1,871,830
Allowance for obsolescence (See Note 24 (i))		(151,439	)		(184,771	)

		2,460,384			1,687,059

16	Receivables and prepayments


	Year ended December 31,
	2010			2009
Prepaid expenses and other receivables		58,176			55,473
Government entities		7,190			11,739
Employee advances and loans		19,479			14,380
Advances to suppliers and other advances		54,048			15,894
Government tax refunds on exports		30,130			35,379
Receivables from related parties		35,153			16,561
Derivative financial instruments		29,684			16,873
Miscellaneous		55,250			60,769

		289,110			227,068
Allowance for other doubtful accounts (see Note 24 (i))		(6,574	)		(6,944	)

		282,536			220,124

F-39

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

17	Current tax assets and liabilities


	Year ended December 31,
	2010		2009
Current tax assets
V.A.T. credits		126,214		78,925
Prepaid taxes		123,103		146,524
Carry-backs		—		34,831

		249,317		260,280


	Year ended December 31,
	2010		2009
Current tax liabilities
Income tax liabilities		108,744		202,111
V.A.T. liabilities		24,384		33,382
Other taxes		74,524		71,046

		207,652		306,539

18	Trade receivables


	Year ended December 31,
	2010			2009
Current accounts		1,410,235			1,341,942
Receivables from related parties		32,235			8,532

		1,442,470			1,350,474
Allowance for doubtful accounts (see Note 24 (i))		(20,828	)		(40,172	)

		1,421,642			1,310,302

The following table sets forth details of the age of trade receivables:


	Trade Receivables			Not Due		Past due
	Trade Receivables			Not Due		1 - 180 days			> 180 days
At December 31, 2010
Guaranteed		615,672			543,346		62,842			9,484
Not guaranteed		826,798			632,274		173,573			20,951

Guaranteed and not guaranteed		1,442,470			1,175,620		236,415			30,435
Allowance for doubtful accounts		(20,828	)		—		(4,202	)		(16,626	)

Net Value		1,421,642			1,175,620		232,213			13,809

At December 31, 2009
Guaranteed		588,935			479,352		98,074			11,509
Not guaranteed		761,539			556,805		163,344			41,390

Guaranteed and not guaranteed		1,350,474			1,036,157		261,418			52,899
Allowance for doubtful accounts		(40,172	)		—		(183	)		(39,989	)

Net Value		1,310,302			1,036,157		261,235			12,910

No material financial assets that are fully performing have been renegotiated in the last year.

F-40

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

19	Cash and cash equivalents, and Other investments


	Year ended December 31,
	2010		2009
Other investments
Financial debt instruments and time deposits		676,224		579,675

Cash and cash equivalents
Cash at banks		174,167		176,121
Liquidity funds		361,999		1,068,853
Short – term investments		307,695		297,855

Cash and cash equivalents		843,861		1,542,829

20	Borrowings


	Year ended December 31,
	2010			2009
Non-current
Bank borrowings		222,596			663,256
Other loans		402			220
Finance lease liabilities		260			407
Costs of issue of debt		(2,688	)		(8,702	)

		220,570			655,181
Current
Bank borrowings		997,378			771,024
Other loans, including related companies		4,729			9,074
Bank overdrafts		23,696			14,122
Finance lease liabilities		163			179
Costs of issue of debt		(2,040	)		(2,816	)

		1,023,926			791,583

Total Borrowings		1,244,496			1,446,764

The maturity of borrowings is as follows:


	1 year or less		1 - 2 years		2 - 3 years		3 - 4 years		4 - 5 years		Over 5 years		Total
At December 31, 2010
Financial lease		163		163		97		—		—		—		423
Other borrowings		1,023,763		154,064		33,106		7,999		7,873		17,268		1,244,073

Total borrowings		1,023,926		154,227		33,203		7,999		7,873		17,268		1,244,496

Interest to be accrued (*)		19,075		4,818		1,813		1,544		1,357		2,060		30,667
Interest rate derivatives contract		5,359		—		—		—		—		—		5,359

Total		1,048,360		159,045		35,016		9,543		9,230		19,328		1,280,522

(*)	Includes the effect of hedge accounting.

F-41

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

20	Borrowings (Cont.)

Significant borrowings include:

In million of $

Disbursement date

Borrower

Type

Original

Outstanding

Final maturity

October 2006

Tamsa

Syndicated

700.0

155.6

October 2011 (*)

May 2007

Hydril

Syndicated

300.0

100.0

May 2012 (*)

June 2008

Dalmine

Bilateral

150.0

125.0

June 2013

October 2006

Dalmine

Syndicated

150.0

33.3

October 2011 (*)

(*)	The main covenants on these loan agreements are limitations on liens and encumbrances, limitations on the sale of certain assets, certain restrictions on capital expenditures, restrictions on investments and compliance with financial ratios (e.g., leverage ratio and interest coverage ratio).

As of December 31, 2010, Tenaris was in compliance with all of its covenants.

The weighted average interest rates before tax shown below were calculated using the rates set for each instrument in its corresponding currency as of December 31, 2010 and 2009 (considering hedge accounting). The changes in interest rate are basically due to changes in floating interest rate and to the designation for hedge accounting of certain Argentine Peso-denominated debts.


	2010			2009
Total borrowings		4.08	%		4.02	%

Breakdown of long-term borrowings by currency and rate is as follows:

Non current borrowings


		Year ended December 31,
Currency	Interest rates	2010		2009
USD	Variable		155,356		589,319
BRL	Fixed		55,059		52,688
Others	Variable		7,284		9,120
Others	Fixed		2,871		4,054

Total non current borrowings			220,570		655,181

The carrying amounts of Tenaris’ assets pledged as collateral of liabilities are as follows:


	Year ended December 31,
	2010		2009
Property, plant and equipment mortgages		127,564		167,357

Tenaris’ consolidated debt includes $21.5 million of Dalmine secured by certain of its properties.

Breakdown of short-term borrowings by currency and rate is as follows:

Current borrowings

Year ended December 31,

Currency

Interest rates

2010

2009

USD

Variable

384,644

470,408

ARS

Fixed

342,614

230,141

MXN

Fixed

200,174

—

EUR

Variable

37,817

76,028

USD

Fixed

34,451

6,449

Others

Variable

17,657

1,844

Others

Fixed

6,569

6,713

Total current borrowings

1,023,926

791,583

F-42

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

21	Deferred income tax

Deferred income taxes are calculated in full on temporary differences under the liability method using the tax rate of each country.

The movement on the deferred income tax account is as follows:


	Year ended December 31,
	2010			2009
At the beginning of the year		663,184			663,515
Translation differences		6,812			9,991
Deconsolidation / Transfer to held for sale		—			24,250
Charged directly to Other Comprehensive Income		2,105			(5,684	)
Income statement charge / (credit)		58,848			(32,962	)
Effect of currency translation on tax base		(4,027	)		4,297
Deferred employees’ statutory profit sharing charge		(3,219	)		(223	)

At the end of the year		723,703			663,184

The evolution of deferred tax assets and liabilities during the year are as follows:

Deferred tax liabilities


	Fixed assets			Inventories			Intangible and Other (a)			Total
At the beginning of the year		251,174			38,736			708,641			998,551
Translation differences		8,020			1,175			4,429			13,624
Charged directly to Other Comprehensive Income		—			—			1,133			1,133
Income statement charge / (credit)		114,565			(8,059	)		(41,002	)		65,504

At December 31,2010		373,759			31,852			673,201			1,078,812


	Fixed assets			Inventories			Intangible and Other (a)			Total
At the beginning of the year		242,426			49,176			762,236			1,053,838
Translation differences		11,247			577			11,619			23,443
Deconsolidation / Transfer to held for sale		—			—			(149	)		(149	)
Charged directly to Other Comprehensive Income		—			—			(1,265	)		(1,265	)
Income statement charge / (credit)		(2,499	)		(11,017	)		(63,800	)		(77,316	)

At December 31,2009		251,174			38,736			708,641			998,551

(a)	Includes the effect of currency translation on tax base explained in Note 8

Deferred tax assets


	Provisions and allowances			Inventories			Tax losses			Other			Total
At the beginning of the year		(51,157	)		(139,971	)		(35,772	)		(108,467	)		(335,367	)
Translation differences		(1,778	)		(266	)		(2,926	)		(1,842	)		(6,812	)
Charged directly to Other Comprehensive Income		—			—			—			972			972
Income statement charge / (credit)		(15,920	)		(6,176	)		9,258			(1,064	)		(13,902	)

At December 31, 2010		(68,855	)		(146,413	)		(29,440	)		(110,401	)		(355,109	)

F-43

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

21	Deferred income tax (Cont.)

Deferred tax assets (Cont.)


	Provisions and allowances			Inventories			Tax losses			Other			Total
At the beginning of the year		(59,063	)		(218,969	)		(1,744	)		(110,547	)		(390,323	)
Translation differences		(8,663	)		(1,500	)		(352	)		(2,937	)		(13,452	)
Deconsolidation / Transfer to held for sale		2,809			10,260			—			11,330			24,399
Charged directly to Other Comprehensive Income		—			—			—			(4,419	)		(4,419	)
Income statement charge / (credit)		13,760			70,238			(33,676	)		(1,894	)		48,428

At December 31, 2009		(51,157	)		(139,971	)		(35,772	)		(108,467	)		(335,367	)

Deferred income tax assets and liabilities are offset when (1) there is a legally enforceable right to set off current tax assets against current tax liabilities and (2) when the deferred income taxes relate to the same fiscal authority on either the same taxable entity or different taxable entities where there is an intention to settle the balances on a net basis. The following amounts, determined after appropriate setoff, are shown in the consolidated statement of financial position:


	Year ended December 31,
	2010			2009
Deferred tax assets		(210,523	)		(197,603	)
Deferred tax liabilities		934,226			860,787

		723,703			663,184

The recovery analysis of deferred tax assets and deferred tax liabilities is as follows:


	Year ended December 31,
	2010			2009
Deferred tax assets to be recovered after 12 months		(129,416	)		(106,862	)
Deferred tax liabilities to be recovered after 12 months		1,012,852			936,732

22	Other liabilities

(i)

Other liabilities – Non current


	Year ended December 31,
	2010		2009
Employee liabilities
Employee’s statutory profit sharing		31,551		26,369
Employee severance indemnity (a)		46,459		52,725
Pension benefits (b)		45,243		46,473
Employee retention and long term incentive program		33,460		19,597

		156,713		145,164

Taxes payable		1,518		3,360
Derivative financial instruments		—		20,533
Miscellaneous		34,978		23,410

		36,496		47,303

		193,209		192,467

F-44

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

22	Other liabilities (Cont.)

(i)

Other liabilities – Non current (Cont.)

(a) Employees’ severance indemnity

The amounts recognized in the statement of financial position are as follows:


	Year ended December 31,
	2010			2009
At the beginning of the year		52,725			56,939
Current service cost		11,291			10,809
Interest Cost		2,094			2,627
Translation differences		(3,467	)		1,911
Actuarial gain		(535	)		—
Used		(18,177	)		(20,377	)
Increase due to business combinations		—			914
Other		2,528			(98	)

At the end of the year		46,459			52,725

The amounts recognized in the income statement are as follows:


	Year ended December 31,
	2010			2009
Current service cost		11,291			10,809
Interest cost		2,094			2,627
Actuarial gain		(535	)		—

Total included in Labor costs		12,850			13,436

The principal actuarial assumptions used were as follows:


	Year ended December 31,
	2010		2009
Discount rate		5% - 8%		4% - 8%
Rate of compensation increase		3% - 6%		3% - 6%

(b) Pension benefits

•

Unfunded

The amounts recognized in the statement of financial position are determined as follows:


	Year ended December 31,
	2010			2009
Present value of unfunded obligations		52,917			44,261
Unrecognized actuarial losses		(15,643	)		(11,235	)

Liability		37,274			33,026

The amounts recognized in the income statement are as follows:


	Year ended December 31,
	2010		2009
Current service cost		1,355		1,356
Interest cost		2,956		2,855
Net actuarial losses recognized in the year		536		681
Past service cost recognized		—		189

Total included in Labor costs		4,847		5,081

F-45

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

22	Other liabilities (Cont.)

(i)

Other liabilities – Non current (Cont.)

(b) Pension benefits (Cont.)

•

Unfunded (Cont.)

Movement in the present value of unfunded obligation:


	Year ended December 31,
	2010			2009
At the beginning of the year		44,261			40,339
Translation differences		450			1,146
Transfers, reclassifications and new participants of the plan		2,453			2,662
Total expense		4,311			4,211
Actuarial losses (gains)		5,141			(2,482	)
Benefits paid		(1,951	)		(1,615	)
Other		(1,748	)		—

At the end of the year		52,917			44,261

The principal actuarial assumptions used were as follows:


	Year ended December 31,
	2010		2009
Discount rate		5% - 7%		6% - 7%
Rate of compensation increase		2% - 3%		2% - 3%

•

Funded

The amounts recognized in the statement of financial position are as follows:


	Year ended December 31,
	2010			2009
Present value of funded obligations		162,740			144,005
Unrecognized actuarial losses		(20,425	)		(10,053	)
Fair value of plan assets (*)		(134,346	)		(120,505	)

Liability		7,969			13,447

(*)	Mainly balanced strategy through mutual funds and money markets.

The amounts recognized in the income statement are as follows:


	Year ended December 31,
	2010			2009
Current service cost		2,389			1,775
Interest cost		7,953			7,640
Net actuarial losses (gains) recognized in the year		866			(168	)
Expected return on plan assets		(7,886	)		(5,594	)
Past service cost recognized		626			—

Total included in Labor costs		3,948			3,653

Movement in the present value of funded obligations:


	Year ended December 31,
	2010			2009
At the beginning of the year		144,005			117,463
Translation differences		4,674			14,204
Total expense		10,342			9,415
Actuarial losses		11,142			11,827
Benefits paid		(7,895	)		(8,817	)
Other		472			(87	)

At the end of the year		162,740			144,005

F-46

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

22	Other liabilities (Cont.)

(i)

Other liabilities – Non current (Cont.)

(b) Pension benefits (Cont.)

•

Funded (Cont.)

Movement in the fair value of plan assets:


	Year ended December 31,
	2010			2009
At the beginning of the year		(120,505	)		(99,511	)
Translation differences		(3,729	)		(10,762	)
Expected return on plan assets		(7,886	)		(5,594	)
Actuarial gains		(366	)		(7,694	)
Contributions paid		(9,915	)		(5,845	)
Benefits paid		7,895			8,817
Other		160			84

At the end of the year		(134,346	)		(120,505	)

The principal actuarial assumptions used were as follows:


	Year ended December 31,
	2010		2009
Discount rate		5% - 6%		6%
Rate of compensation increase		3% - 4%		3% - 4%

(ii) Other liabilities – current


	Year ended December 31,
	2010		2009
Payroll and social security payable		187,034		151,067
Liabilities with related parties		426		1,142
Derivative financial instruments		11,971		3,457
Miscellaneous		34,159		36,524

		233,590		192,190

23	Non-current allowances and provisions

(i)

Deducted from non current receivables


	Year ended December 31,
	2010			2009
Values at the beginning of the year		(4,725	)		(5,017	)
Translation differences		201			276
Additional allowances		(86	)		(2	)
Reclassifications		(37	)		—
Used		841			18

At December 31,		(3,806	)		(4,725	)

(ii)

Liabilities


	Year ended December 31,
	2010			2009
Values at the beginning of the year		80,755			89,526
Translation differences		1,054			9,805
Deconsolidation / Transfer to held for sale		—			(1,380	)
Additional provisions / (Reversals)		7,290			(7,170	)
Reclassifications		—			129
Used		(5,177	)		(10,155	)

At December 31,		83,922			80,755

F-47

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

24	Current allowances and provisions

(i)

Deducted from assets


	Allowance for doubtful accounts - Trade receivables			Allowance for other doubtful accounts - Other receivables			Allowance for inventory obsolescence
Year ended December 31, 2010
Values at the beginning of the year		(40,172	)		(6,944	)		(184,771	)
Translation differences		424			44			(1,284	)
Reversals / (Additional allowances)		17,095			(280	)		34,044
Reclassifications		—			37			—
Used		1,825			569			572

At December 31, 2010		(20,828	)		(6,574	)		(151,439	)

Year ended December 31, 2009
Values at the beginning of the year		(34,128	)		(5,247	)		(93,344	)
Translation differences		(333	)		(238	)		(4,186	)
Reversals / (Additional allowances)		(13,960	)		(1,763	)		(89,041	)
Used		3,756			304			218
Deconsolidation / Transfer to held for sale		4,493			—			1,582

At December 31, 2009		(40,172	)		(6,944	)		(184,771	)

(ii)

Liabilities


	Sales risks			Other claims and contingencies			Total
Year ended December 31, 2010
Values at the beginning of the year		7,023			21,609			28,632
Translation differences		33			(657	)		(624	)
(Reversals) / Additional allowances		14,195			5,195			19,390
Reclassifications		—			(5	)		(5	)
Used		(15,069	)		(7,223	)		(22,292	)

At December 31, 2010		6,182			18,919			25,101

Year ended December 31, 2009
Values at the beginning of the year		9,318			19,193			28,511
Translation differences		722			871			1,593
(Reversals) / Additional allowances		20,586			19,158			39,744
Reclassifications		—			(129	)		(129	)
Used		(23,603	)		(17,484	)		(41,087	)

At December 31, 2009		7,023			21,609			28,632

25	Derivative financial instruments

Net fair values of derivative financial instruments

The net fair values of derivative financial instruments disclosed within Other liabilities and Receivables at the reporting date, in accordance with IAS 39, are:


	Year ended December 31,
	2010			2009
Foreign exchange derivatives contracts		28,259			16,873
Embedded Canadian dollar forward purchases		3,278			—

Contracts with positive fair values		31,537			16,873

Interest rate derivatives contracts		(5,359	)		(17,738	)
Foreign exchange derivatives contracts		(6,613	)		(3,434	)
Embedded Canadian dollar forward purchases		—			(2,818	)

Contracts with negative fair values		(11,972	)		(23,990	)

Total		19,565			(7,117	)

F-48

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

25	Derivative financial instruments (Cont.)

Foreign exchange derivative contracts

The net fair values of exchange rate derivatives, including embedded derivatives, were as follows:


Purchase currency	Sale currency	Term		Fair Value at Dec-10			Fair Value at Dec-09
ARS	USD		2011		24,819			13,601
USD	BRL		2011		(2,087	)		(585	)
USD	KWD		2011		(1,732	)		—
USD	CAD		2011		(1,563	)		(398	)
MXN	USD		2011		1,451			(305	)
JPY	USD		2011		1,043			—
Others					(285	)		1,126

Subtotal					21,646			13,439
CAD	USD (Embedded derivative)		2017		3,278			(2,818	)

Total					24,924			10,621

Interest rate derivative contracts

The net fair values of interest rate derivatives were as follows:


Type of derivative	Receive Reference rate		Term		Fair Value at Dec-10			Fair Value at Dec-09
Pay fixed/Receive variable		Euribor		2010		—			(22	)
Swaps with KI (2.50%)		Libor 6M		2011		(5,359	)		(17,716	)

						(5,359	)		(17,738	)

Hedge Accounting

Tenaris applies hedge accounting to certain cash flow hedges of highly probable forecast transactions. The following are the derivatives that were designated for hedge accounting as of December 31, 2010 and 2009.

•

Foreign Exchange derivatives


				Fair Value						Hedge Accounting Reserve
				Year ended December 31,						Year ended December 31,
Purchase currency	Sale currency	Term		2010			2009			2010			2009
ARS	USD		2011		24,723			—			(1,482	)		—
EUR	USD		2011		219			(506	)		(622	)		(506	)
EUR	BRL		2011		(823	)		—			(823	)		—
USD	KWD		2011		(796	)		—			(635	)		—
EUR	MXN		2011		(255	)		(674	)		—			1,511

					23,068			(1,180	)		(3,562	)		1,005

•

Interest Rate derivatives


							Fair Value						Hedge Accounting Reserve
Type of Derivative							Year ended December 31,						Year ended December 31,
Type of Derivative	Rate		Term		Rate		2010			2009			2010			2009
Pay fixed / Receive variable		Euribor		2010		5.72%		—			(22	)		—			—
Swaps with KI (2.50%)		Libor 6M		2011		4.60% - 5.08%		(5,359	)		(17,716	)		(5,367	)		(17,716	)

								(5,359	)		(17,738	)		(5,367	)		(17,716	)

F-49

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

25	Derivative financial instruments (Cont.)

Following is a summary of the hedge reserve evolution:


	Equity Reserve Dec-08			Movements 2009			Equity Reserve Dec-09			Movements 2010			Equity Reserve Dec-10
Foreign Exchange		12,749			(11,744	)		1,005			(4,567	)		(3,562	)
Interest Rate		(29,737	)		12,021			(17,716	)		12,349			(5,367	)

Total Cash flow Hedge		(16,988	)		277			(16,711	)		7,782			(8,929	)

Tenaris estimates that the cash flow hedge reserve at December 31, 2010 will be recycled to the Consolidated Income Statement during 2011.

26	Contingencies, commitments and restrictions on the distribution of profits

Contingencies

Tenaris is involved in litigations arising from time to time in the ordinary course of business. Based on management’s assessment and the advice of legal counsel, it is not anticipated that the ultimate resolution of pending litigation will result in amounts in excess of recorded provisions (Notes 23 and 24) that would be material to Tenaris’ consolidated financial position, results of operations and cash flows.

Conversion of tax loss carry-forwards

On December 18, 2000, the Argentine tax authorities notified Siderca S.A.I.C., a Tenaris subsidiary organized in Argentina (“Siderca”), of an income tax assessment related to the conversion of tax loss carry-forwards into Debt Consolidation Bonds under Argentine Law No. 24.073. The adjustments proposed by the tax authorities represent an estimated contingency of ARS 97.7 million (approximately $24.7 million) at December 31, 2010, in taxes and penalties. Based on the views of Siderca’s tax advisors, Tenaris believes that it is not probable that the ultimate resolution of the matter will result in an obligation. Accordingly, no provision was recorded in these Consolidated Financial Statements.

Ongoing investigation

The Company learned from one of its customers in Central Asia that certain sales agency payments made by one of the Company’s subsidiaries may have improperly benefited employees of the customer and other persons. The Audit Committee of the Company’s Board of Directors engaged external counsel in connection with a review of these payments and related matters. The Company voluntarily notified the U.S. Securities and Exchange Commission and the U.S. Department of Justice, and shared the results of the review with these agencies. At this time the resolution of these matters is pending and the Company cannot predict the final outcome of these matters.

Commitments

Set forth is a description of Tenaris’ main outstanding commitments:

•

A Tenaris company is a party to a five-year contract with Nucor Corporation, under which it committed to purchase from Nucor steel coils, with deliveries starting in January 2007 on a monthly basis. The Tenaris company has negotiated a one-year extension to the original contract, through December 2012. Prices are adjusted quarterly in accordance with market conditions. As of December 31, 2010 the estimated aggregate amount of the contract at current prices is approximately $565 million.

•

A Tenaris company is a party to a ten year raw material purchase contract with Rio Tinto Fer et Titane (ex- QIT), under which it committed to purchase steel bars, with deliveries starting in July 2007. As of December 31, 2010 the estimated aggregate amount of the remaining commitments on the contract at current prices is approximately $228 million. The contract allows the Tenaris company to claim lower commitments in market downturns and severe market downturns subject to certain limitations.

F-50

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

26	Contingencies, commitments and restrictions on the distribution of profits (Cont.)

Commitments (Cont.)

•

A Tenaris company entered into a contract with Siderar, a related company of Ternium, for the supply of steam generated at the power generation facility that Tenaris owns in the compound of the Ramallo facility of Siderar. Under this contract, Tenaris has to provide 250 tn/hour of steam, and Siderar has the obligation to take or pay this volume. The amount of this outsourcing agreement totals approximately $107 million and is due to terminate in 2018.

Restrictions to the distribution of profits and payment of dividends

As of December 31, 2010, equity as defined under Luxembourg law and regulations consisted of:

(all amounts in thousands of U.S. dollars)


Share capital			1,180,537
Legal reserve			118,054
Share premium			609,733
Retained earnings including net income for the year ended December 31, 2010			16,631,947

Total equity in accordance with Luxembourg law			18,540,271

At least 5% of the Company’s net income per year, as calculated in accordance with Luxembourg law and regulations, must be allocated to the creation of a legal reserve equivalent to 10% of the Company’s share capital. As of December 31, 2010, this reserve is fully allocated and additional allocations to the reserve are not required under Luxembourg law. Dividends may not be paid out of the legal reserve.

The Company may pay dividends to the extent, among other conditions, that it has distributable retained earnings calculated in accordance with Luxembourg law and regulations.

At December 31, 2010, distributable amount under Luxembourg law totals $17.2 billion, as detailed below.

(all amounts in thousands of U.S. dollars)


Retained earnings at December 31, 2009 under Luxembourg law	3,916,482
Gain from the transfer of shares in affiliated undertakings (see note 33)	12,020,184
Dividends received	1,100,175
Other income and expenses for the year ended December 31, 2010	(3,511	)
Dividends paid	(401,383	)

Retained earnings at December 31, 2010 under Luxembourg law	16,631,947
Share premium	609,733

Distributable amount at December 31, 2010 under Luxembourg law	17,241,680

27	Business combinations and other acquisitions

(a) Tenaris acquired control of Seamless Pipe Indonesia Jaya

In April 2009, Tenaris completed the acquisition from Bakrie & Brothers TbK, Green Pipe International Limited and Cakrawala Baru of a 77.45% holding in Seamless Pipe Indonesia Jaya (“SPIJ”), an Indonesian OCTG processing business with heat treatment and premium connection threading facilities, for a purchase price of $69.5 million, with $21.9 million being payable as consideration for SPIJ’s equity and $47.6 million as consideration for the assignment of certain sellers’ loan to SPIJ. Tenaris began consolidating SPIJ’s balance sheet and results of operations since April 2009.

Pro forma data including acquisitions for all of 2009

Had the SPIJ transaction been consummated on January 1, 2009, then Tenaris’ unaudited pro forma net sales and net income from continuing operations would not have changed materially.

F-51

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

27	Business combinations and other acquisitions (Cont.)

(b) Non-controlling interests

During the year ended December 31, 2010, 2009 and 2008 additional shares of certain Tenaris subsidiaries were acquired from non-controlling shareholders for approximately $3.0 million, $9.5 million and $18.6 million respectively.

The assets and liabilities determined arising from the acquisitions are as follows:


	Year ended December 31, 2009
Other assets and liabilities (net)		(1,309	)
Property, plant and equipment		24,123

Net assets acquired		22,814
Non-controlling		3,170

Sub-total		25,984
Assumed liabilities		47,600

Sub-total		73,584
Cash acquired		5,501

Purchase consideration		79,085

The businesses acquired during the year ended December 31, 2009 contributed revenues of $92.5 million and an operating income of $0.9 million.

28	Cash flow disclosures


	Year ended December 31,
	2010			2009			2008
(i) Changes in working capital
Inventories		(773,325	)		1,414,157			(492,545	)
Receivables and prepayments		(51,449	)		(52,395	)		12,079
Trade receivables		(111,340	)		792,345			(374,463	)
Other liabilities		55,313			80,696			(71,638	)
Customer advances		(25,056	)		(180,531	)		(174,014	)
Trade payables		261,807			(316,924	)		48,949

		(644,050	)		1,737,348			(1,051,632	)


(ii) Income tax accruals less payments
Tax accrued (*)		450,004			513,153			1,011,675
Taxes paid		(507,983	)		(971,239	)		(1,236,713	)

		(57,979	)		(458,086	)		(225,038	)

(*)	For 2008, does not include tax accrued on the sale of Pressure Control disclosed as discontinued operations.


(iii) Interest accruals less payments, net
Interest accrued	31,248		90,896		136,737
Interest received	44,269		26,900		83,241
Interest paid	(57,817	)	(141,963	)	(164,486	)

	17,700		(24,167	)	55,492


(iv) Cash and cash equivalents
Cash at banks, liquidity funds and short - term investments	843,861		1,542,829		1,538,769
Bank overdrafts	(23,696	)	(14,122	)	(13,747	)

	820,165		1,528,707		1,525,022

As of December 31, 2010, 2009 and 2008, the components of the line item “other, including currency translation adjustment” are immaterial to net cash provided by operating activities.

F-52

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

29	Discontinued operations

Nationalization of Venezuelan Subsidiaries

The results of operations and cash flows generated by the Venezuelan Companies (as defined in Note 32) are presented as discontinued operations in these Consolidated Financial Statements. For further information see Note 32.

Sale of Hydril pressure control business

On April 1, 2008, Tenaris sold to General Electric Company (GE) the pressure control business included as part of the acquisition of Hydril Company undertaken on May 2007. The pressure control business was sold, for an amount equivalent on a debt-free basis to $1,114 million. The result of this transaction was an after-tax gain of $394.3 million, calculated as the net proceeds of the sale less the book value of net assets held for sale, the corresponding tax effect and related expenses.

Book value of the Assets and Liabilities disposed:


	At March 31, 2008
Property, plant and equipment, net		64,556
Intangible assets, net		295,371
Inventories		173,110
Trade receivables		78,018
Other assets		39,643

Total current and non current assets held for sale		650,698

Deferred tax liabilities		71,434
Customer advances		128,975
Trade payables		54,175
Other liabilities		15,291

Liabilities associated with current and non-current assets held for sale		269,875

Analysis of the result of discontinued operations:

(i)

Result for discontinued operations


(all amounts in thousands of U.S. dollars)	*() Year ended December 31,**
(all amounts in thousands of U.S. dollars)	2010		2009			2008
(Loss) for discontinued operations		—		(28,138	)		(87,418	)
After tax gain on disposal of operations		—		—			394,323

Net (loss) income for discontinued operations		—		(28,138	)		306,905

(*)	Corresponds to the Venezuelan Companies (years 2009 and 2008) and Pressure Control (year 2008) operations.

(ii)

Net cash flows attributable to discontinued operations


	*() Year ended December 31,**
	2010		2009			2008
Net cash provided by operating activities		—		1,788			20,786
Net cash used in investing activities		—		(801	)		(7,330	)
Net cash provided by financing activities		—		5,306			9,046

(*)	Corresponds to the Venezuelan Companies (years 2009 and 2008) and Pressure Control (year 2008) operations.

All amounts were estimated only for disclosure purposes, as cash flows from these discontinued operations were not managed separately from other cash flows.

F-53

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

30	Related party transactions

As of December 31, 2010:

•

San Faustin N.V., a Curacao company (“San Faustin”), owned 713,605,187 shares in the Company, representing 60.45% of the Company’s capital and voting rights.

•

San Faustin N.V. owned all of its shares in the Company through its wholly-owned subsidiary Techint Holdings S.ar.l. (formerly known as I.I.I. Industrial Investments Inc), a Cayman Islands Company (“Techint”).

•

Rocca & Partners S.A. (“R&P”) controlled a significant portion of the voting power of San Faustin and had the ability to influence matters affecting, or submitted to a vote of the shareholders of San Faustin N.V., such as the election of directors, the approval of certain corporate transactions and other matters concerning the company’s policies.

•

There were no controlling shareholders for R&P.

Based on the information most recently available to the Company, Tenaris’ directors and senior management as a group owned 0.12% of the Company’s outstanding shares.

In February 2011, the Company was informed by Techint that there had been a reorganization in the chain of ownership of the Company pursuant to which the Company’s direct and indirect controlling shareholders had been redomiciled to Europe. The Company was further informed that this reorganization does not involve any change in the control of the Company. Based on the information received:

•

Techint transferred its domicile from the Cayman Islands to Luxembourg;

•

San Faustin also transferred its domicile from Curacao to Luxembourg and changed its name to “San Faustin S.A.” and

•

In connection with the redomiciliation of San Faustin into Luxembourg, R&P organized a Dutch private foundation (Stichting) under the name of Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin (“RP STAK”). As of the date hereof, RP STAK holds shares in San Faustin sufficient in number to control San Faustin. No person or group of persons controls RP STAK.

At December 31, 2010, the closing price of Ternium’s ADSs as quoted on the New York Stock Exchange was $42.41 per ADS, giving Tenaris’ ownership stake a market value of approximately $974.2 million. At December 31, 2010, the carrying value of Tenaris’ ownership stake in Ternium, based on Ternium’s IFRS financial statements, was approximately $651.4 million. See Section II.B.2.

Transactions and balances disclosed as with “Associated” companies are those with companies over which Tenaris exerts significant influence or joint control in accordance with IFRS, but does not have control. All other transactions and balances with related parties which are not Associated and which are not consolidated are disclosed as “Other”. The following transactions were carried out with related parties:

Year ended December 31, 2010


	Associated (1)		Other		Total
(i) Transactions
(a) Sales of goods and services
Sales of goods		38,442		104,036		142,478
Sales of services		12,073		4,063		16,136

		50,515		108,099		158,614

(b) Purchases of goods and services
Purchases of goods		169,506		30,671		200,177
Purchases of services		63,043		132,614		195,657

		232,549		163,285		395,834

F-54

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

30	Related party transactions (Cont.)

Year ended December 31, 2009


	Associated (1)		Other		Total
(i) Transactions (2)
(a) Sales of goods and services
Sales of goods		25,561		75,097		100,658
Sales of services		12,752		4,352		17,104

		38,313		79,449		117,762

(b) Purchases of goods and services
Purchases of goods		40,171		9,705		49,876
Purchases of services		89,023		71,541		160,564

		129,194		81,246		210,440

Year ended December 31, 2008


	Associated (1)		Other		Total
(i) Transactions (3)
(a) Sales of goods and services
Sales of goods		74,420		37,636		112,056
Sales of services		19,444		4,205		23,649

		93,864		41,841		135,705

(b) Purchases of goods and services
Purchases of goods		123,704		24,161		147,865
Purchases of services		125,161		79,037		204,198

		248,865		103,198		352,063

At December 31, 2010


	Associated (1)			Other			Total
(ii) Year-end balances
(a) Arising from sales / purchases of goods / services
Receivables from related parties		39,761			28,557			68,318
Payables to related parties		(17,534	)		(19,110	)		(36,644	)

		22,227			9,447			31,674

(b) Financial debt
Borrowings		(3,843	)		—			(3,843	)

At December 31, 2009


	Associated (1)			Other			Total
(ii) Year-end balances
(a) Arising from sales / purchases of goods / services
Receivables from related parties		18,273			7,093			25,366
Payables to related parties		(23,898	)		(5,856	)		(29,754	)

		(5,625	)		1,237			(4,388	)

(b) Financial debt
Borrowings		(2,907	)		—			(2,907	)

At December 31, 2008


	Associated (1)			Other			Total
(ii) Year-end balances
(a) Arising from sales / purchases of goods / services
Receivables from related parties		50,137			15,504			65,641
Payables to related parties		(44,470	)		(5,974	)		(50,444	)

		5,667			9,530			15,197

(b) Financial debt
Borrowings		(2,294	)		—			(2,294	)

(1)	Includes Ternium S.A. and its subsidiaries (“Ternium”), Condusid C.A. (“Condusid”), Finma S.A.I.F (“Finma”), Lomond Holdings B.V. group (“Lomond”), Socotherm Brasil S.A. (“Socotherm”) and Hydril Jindal International Private Ltd.

(2)	Includes $2.5 million of purchases to nationalized Venezuelan subsidiaries.

(3)	Includes $12.9 million of sales and $9.5 million to purchases of nationalized Venezuelan subsidiaries.

F-55

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

30	Related party transactions (Cont.)

Directors’ and senior management compensation

During the years ended December 31, 2010, 2009 and 2008, the cash compensation of Directors and Senior managers amounted to $18.6 million, $18.2 million and $22.5 million respectively. In addition, Directors and Senior managers received 485, 436 and 488 thousand units for a total amount of $4.1 million, $3.4 million and $3.4 million respectively in connection with the Employee retention and long term incentive program mentioned in Note O (d).

31	Principal subsidiaries

The following is a list of Tenaris principal subsidiaries and its direct and indirect percentage of ownership of each controlled company at December 31, 2010.


Company	Country of Organization	Main activity	Percentage of ownership at December 31, (*)
Company	Country of Organization	Main activity	2010			2009			2008
ALGOMA TUBES INC.	Canada	Manufacturing of seamless steel pipes		100	%		100	%		100	%
CONFAB INDUSTRIAL S.A. and subsidiaries (a)	Brazil	Manufacturing of welded steel pipes and capital goods		41	%		40	%		40	%
DALMINE S.p.A.	Italy	Manufacturing of seamless steel pipes		99	%		99	%		99	%
HYDRIL COMPANY and subsidiaries (except detailed) (b)	USA	Manufacture and marketing of premium connections		100	%		100	%		100	%
HYDRIL U.K. LTD.	United Kingdom	Manufacturing of steel products		100	%		100	%		100	%
INVERSIONES BERNA S.A.	Chile	Financial Company		100	%		100	%		100	%
MAVERICK TUBE, LLC (e)	USA	Manufacturing of welded steel pipes		0	%		100	%		100	%
MAVERICK TUBE CORPORATION and subsidiaries (except detailed)	USA	Manufacturing of welded steel pipes		100	%		100	%		100	%
NKKTUBES	Japan	Manufacturing of seamless steel pipes		51	%		51	%		51	%
PT SEAMLESS PIPE INDONESIA JAYA	Indonesia	Manufacturing of seamless steel products		77	%		77	%		0	%
PRUDENTIAL STEEL ULC	Canada	Manufacturing of welded steel pipes		100	%		100	%		100	%
S.C. SILCOTUB S.A.	Romania	Manufacturing of seamless steel pipes		100	%		100	%		100	%
SIAT S.A.	Argentina	Manufacturing of welded and seamless steel pipes		82	%		82	%		82	%
SIDERCA S.A.I.C. and subsidiaries (except detailed) (c)	Argentina	Manufacturing of seamless steel pipes		100	%		100	%		100	%
SIDTAM S.A. (f)	Mexico	Holding Company		0	%		100	%		100	%
TALTA - TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA.	Madeira	Holding Company		100	%		100	%		100	%
TENARIS CONNECTION Limited and subsidiaries	St. Vincent & the Grenadines	Ownership and licensing of steel technology		100	%		100	%		100	%
TENARIS FINANCIAL SERVICES S.A.	Uruguay	Financial Company		100	%		100	%		100	%
TENARIS GLOBAL SERVICES (CANADA) INC.	Canada	Marketing of steel products		100	%		100	%		100	%
TENARIS GLOBAL SERVICES (PANAMA) S.A. - Suc. Colombia	Colombia	Marketing of steel products		100	%		100	%		100	%
TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION	USA	Marketing of steel products		100	%		100	%		100	%
TENARIS GLOBAL SERVICES S.A. and subsidiaries (except detailed) (d)	Uruguay	Holding company and marketing of steel products		100	%		100	%		100	%
TENARIS INVESTMENTS LTD and subsidiaries (except detailed)	Ireland	Holding company and financial services		100	%		100	%		100	%
TENARIS INVESTMENTS LTD S.ar.l.	Luxembourg	Holding Company		100	%		0	%		0	%
TENARIS INVESTMENTS LTD S.ar.l., Zug Branch	Switzerland	Hoding Company and financial services		100	%		0	%		0	%
TENARIS INVESTMENTS SWITZERLAND AG	Switzerland	Holding Company		100	%		0	%		0	%
TUBOS DE ACERO DE MEXICO SA	Mexico	Manufacturing of seamless steel pipes		100	%		100	%		100	%
TUBOS DEL CARIBE LTDA.	Colombia	Manufacturing of welded steel pipes		100	%		100	%		100	%

F-56

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

31	Principal subsidiaries (Cont.)

(*)	All percentages rounded.

(a)	Tenaris holds 99% of the voting shares of Confab Industrial S.A. Tenaris holds 41% of Confab’s subsidiaries except for Tenaris Confab Hastes de Bombeio S.A.where it holds 70%.

(b)	Tenaris holds 100% of Hydril’s subsidiaries except for Technical Drilling & Production Services Nigeria Ltd. where it holds 60%.

(c)	Tenaris holds 100% of Siderca’s subsidiaries, except for Scrapservice S.A. where it holds 75%.

(d)	Tenaris holds 95% of Tenaris Supply Chain S.A, 95% of Tenaris Saudi Arabia Limited and 60% of Gepnaris S.A.

(e)	Merged with Maverick Tube Corporation.

(f)	Merged with Tubos de Acero de Mexico S.A.

32	Processes in Venezuela

Nationalization of Venezuelan Subsidiaries

Within the framework of Decree Law 6058, on May 22, 2009, Venezuela’s President Hugo Chávez announced the nationalization of, among other companies, the Company’s majority-owned subsidiaries TAVSA – Tubos de Acero de Venezuela S.A. (“Tavsa”) and, Matesi, Materiales Siderurgicos S.A (“Matesi”), and Complejo Siderurgico de Guayana, C.A (“Comsigua”), in which the Company has a non-controlling interest (collectively, “the Venezuelan Companies”). On May 25, 2009, the Minister of Basic Industries and Mines of Venezuela (“MIBAM”) issued official communications N°230/09 and 231/09, appointing the MIBAM’s representatives to the transition committees charged with overseeing the nationalization processes of Tavsa and Matesi. On May 29, 2009, the Company sent response letters to the MIBAM acknowledging the Venezuelan government’s decision to nationalize Tavsa and Matesi, appointing its representatives to the transition committees, and reserving all of its rights under contracts, investment treaties and Venezuelan and international law and the right to submit any controversy between the Company or its subsidiaries and Venezuela relating to Tavsa and Matesi’s nationalization to international arbitration, including arbitration administered by ICSID.

On July 14, 2009, President Chávez issued Decree 6796, which orders the acquisition of the Venezuelan Companies’ assets and provides that Tavsa’s assets will be held by the Ministry of Energy and Oil, while Matesi and Comsigua’s assets will be held by MIBAM. Decree 6796 also requires the Venezuelan government to create certain committees at each of the Venezuelan Companies; each transition committee must ensure the nationalization of each Venezuelan Company and the continuity of its operations, and each technical committee (to be composed of representatives of Venezuela and the private sector) must negotiate over a 60-day period (extendable by mutual agreement) a fair price for each Venezuelan Company to be transferred to Venezuela. In the event the parties fail to reach agreement by the expiration of the 60-day period (or any extension thereof), the applicable Ministry will assume control and exclusive operation of the relevant Venezuelan Company, and the Executive Branch will order their expropriation in accordance with the Venezuelan Expropriation Law. The Decree also specifies that all facts and activities there under are subject to Venezuelan law and any disputes relating thereto must be submitted to Venezuelan courts.

On August 19, 2009, the Company announced that Venezuela, acting through the transition committee appointed by the MIBAM, unilaterally assumed exclusive operational control over Matesi.

On November 17, 2009, the Company announced that Venezuela acting through PDVSA Industrial S.A. (a subsidiary of Petroleos de Venezuela S.A.), formally assumed exclusive operational control over the assets of Tavsa. Following this formal change in operational control, PDVSA Industrial has assumed complete responsibility over Tavsa’s operations and management and since then Tavsa’s operations are being managed by the transition committee previously appointed by Venezuela. The Company’s representatives in Tavsa’s board of directors have ceased their functions.

On October 7, 2010, Venezuela’s National Assembly passed a law (“Acuerdo”) declaring all of Matesi’s assets to be of public and social interest and ordering the Executive Branch to take the necessary measures for the expropriation of such assets.

The Company’s investments in Tavsa, Matesi and Comsigua are protected under applicable bilateral investment treaties, including the bilateral investment treaty between Venezuela and the Belgian-Luxembourgish Union, and, as noted above, Tenaris continues to reserve all of its rights under contracts, investment treaties and Venezuelan and international law, and to consent to the jurisdiction of the ICSID in connection with the nationalization process.

F-57

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

32	Processes in Venezuela (Cont.)

Nationalization of Venezuelan Subsidiaries (Cont.)

Based on the facts and circumstances described above and following the guidance set forth by IAS 27R, the Company ceased consolidating the Venezuelan Companies results of operations and cash flows as from June 30, 2009 and classified its investments in the Venezuelan Companies as financial assets based on the definitions contained in paragraphs 11(c)(i) and 13 of IAS 32.

The Company classified its interests in the Venezuelan Companies as available-for-sale investments since management believes they do not fulfill the requirements for classification within any of the remaining categories provided by IAS 39 and such classification is the most appropriate accounting treatment applicable to non-voluntary dispositions of assets.

Tenaris subsidiaries have also net receivables with the Venezuelan Companies as of December 31, 2010 for a total amount of $27.7 million.

The Company records its interest in the Venezuelan Companies at its carrying amount at June 30, 2009, and not at fair value, following the guidance set forth by paragraphs 46(c), AG80 and AG81 of IAS 39.

33	Corporate reorganization

The Company was established as a public limited liability company (société anonyme) under Luxembourg’s 1929 holding company regime. Until termination of such regime on December 31, 2010, holding companies incorporated under the 1929 regime (including the Company) were exempt from Luxembourg corporate and withholding tax over dividends distributed to shareholders.

34	Fees paid to the Company’s principal accountant

Total fees accrued for professional services rendered by PricewaterhouseCoopers to Tenaris S.A. and its subsidiaries are detail as follows:


	Year ended December 31,
	2010		2009		2008
Audit Fees		4,291		3,966		4,405
Audit-Related Fees		77		267		76
Tax Fees		161		129		138
All Other Fees		88		—		—

Total		4,617		4,362		4,619

F-58

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

35	Subsequent events

Annual Dividend Proposal

On February 23, 2011 the Company’s board of directors proposed, for the approval of the annual general shareholders’ meeting to be held on June 1, 2011, the payment of an annual dividend of $0.34 per share ($0.68 per ADS), or approximately $401 million, which includes the interim dividend of $0.13 per share ($0.26 per ADS) or approximately $153 million, paid on November 25, 2010. If the annual dividend is approved by the shareholders, a dividend of $0.21 per share ($0.42 per ADS), or approximately $248 million will be paid on June 23, 2011, with an ex-dividend date of June 20, 2011. These Consolidated Financial Statements do not reflect this dividend payable.

36	Update as of June 30, 2011¹

Annual General Meeting and Extraordinary General Meeting of Shareholders

The meeting appointed PricewaterhouseCoopers S.à r.l., Réviseur d’enterprises agréé, as Tenaris’s independent auditors for the fiscal year ending December 31, 2011.

Settlement with U.S. governmental authorities

On May 17, 2011, Tenaris reached a settlement with the U.S. Department of Justice and the U.S. Securities and Exchange Commission, regarding the investigation described in note 26 “Contingencies, commitments and restrictions on the distribution of profits – Ongoing investigation”.

¹	This note was added subsequent to the approval of the financial statements at the Annual General Meeting of Shareholders of the Company held on June 1, 2011.

F-59

Tenaris S.A. Consolidated Financial Statements for the years ended December 31, 2010, 2009 and 2008

Venezuela moves forward with expropriation of Matesi

In June, 2011, within the framework of the Venezuelan National Assembly’s law declaring all of Matesi’s assets to be of public and social interest and ordering the Executive Branch to take the necessary measures for the expropriation of such assets, President Chavez issued Decree 8280/2011, which orders the expropriation of Matesi’s assets as may be required for the implementation of a stateowned project for the production, sale and distribution of briquettes, and further instructs to commence negotiations and take any actions required for the acquisition of such assets.

Ricardo Soler

Chief Financial Officer

F-60

SIGNATURES

The registrant hereby certifies that it meets all the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this annual report on its behalf.

EXHIBIT INDEX


Exhibit Number		Description
1.1		Updated and Consolidated Articles of Association of Tenaris S.A., dated as of June 1, 2011

2.1		Amended and Restated Deposit Agreement entered into between Tenaris S.A. and The Bank of New York Mellon*

7.1		Statement Explaining Calculation of Ratios

8.1		List of Subsidiaries of Tenaris S.A.

12.1		Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

12.2		Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

13.1		Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

13.2		Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

15.1		Consent of Independent Registered Public Accounting Firm

15.2		Item 16-F letter issued by Price Waterhouse & Co. S.R.L.

*	The Deposit Agreement is incorporated by reference to the Registration Statement on Form F-6 filed by Tenaris S.A. on February 28, 2008 (File No. 333-149435).

Updated and Consolidated Articles of Association

Exhibit 1.1

« TENARIS S.A. »

Société anonyme

Luxembourg

R.C.S. Luxembourg, section B numéro 85.203

**********************************************************************************

STATUTS COORDONNES à la date du 1er juin 2011

**********************************************************************************

PAGE 1

Title 1. Name and Legal Structure, Corporate Object,

Registered Office, Duration

Article 1. Name and Legal Structure. TENARIS S.A. is a société anonyme governed by these Articles of Association and by the applicable laws and regulations of the Grand Duchy of Luxembourg.

Article 2. Corporate Object. The object of the Company is the business directly or indirectly related to the taking of interests, in any form whatsoever, in Luxembourg or foreign corporations or other business entities, the administration, management, control and development thereof.

The Company may use its resources to organize, manage, enhance in value and liquidate a portfolio consisting of any kind of securities, patents and pertaining licenses, to participate in the organization, development and control of any business entity to acquire by way of capital contribution, subscription, underwriting, option, purchase or in any manner whatsoever any kind of securities, patents and pertaining licenses as well as to sell, transfer, exchange or otherwise, to enhance in value such securities, patents and rights through any person and in any manner whatsoever, and to afford to companies in which it has an interest any assistance, loans, advances or guarantees.

The Company may raise money in order to finance its activities through the private or public issue of loans, notes, bonds, debentures or other similar instruments or equity certificates denominated in any currency (and may pledge part or all of its assets to secure any money so raised).

In general, the Company may carry out any permitted activities which it may deem appropriate or necessary for the accomplishment of its corporate object.

Article 3. Registered Office. The registered office is established in Luxembourg-City.

The registered office may be transferred within the same locality by decision of the Board of Directors.

The Board of Directors may establish branches or offices abroad.

Whenever there shall occur or be imminent extraordinary political, economic or social developments of any kind likely to jeopardize the normal functioning of the registered office or easy communication between such office and the outside world, the registered office may be declared temporarily, and until the complete termination of such unusual conditions, transferred abroad, without affecting the nationality of the Company, which, notwithstanding such temporary transfer of the registered office, shall remain that of Luxembourg. Such declaration of transfer of the registered office shall be made and brought to the knowledge of third parties by one of the executive bodies of the Company authorized to bind it for acts of current and daily management.

Article 4. Duration. The Company shall be constituted for an unlimited duration.

Title II.- Share Capital

Article 5. Share Capital. The share capital of the Company is set at one billion one hundred and eighty million five hundred and thirty six thousand eight hundred and thirty US dollars (USD 1,180,536,830), represented by one billion one hundred and eighty million five hundred and thirty six thousand eight hundred and thirty (1,180,536,830) shares with a par value of one US dollar (USD 1) per share.

PAGE 2

The authorized capital of the Company shall be two billion five hundred million US dollars (USD 2,500,000,000.-), including the issued share capital, represented by two billion five hundred million (2,500,000,000) shares with a par value of one US dollar (USD 1.-) per share.

The board of directors is authorized for a period starting on the day of the general meeting granting the authorisation and ending on the fifth anniversary of the date of the publication in the Memorial of the relevant deed, to increase the issued share capital in whole or in part from time to time, through issues of shares within the limits of the authorized capital. In connection with such increases of capital, the shares shall be issued for compensation in cash or, subject to applicable provisions of law, in kind at a price or, if shares are issued by way of incorporation of reserves, at an amount, which shall not be less than the par value and may include such issue premium as the board of directors shall decide.

The board of directors may authorize any director, manager or other person to accept subscriptions and direct payment in cash or in kind of the price of shares being whole or part of such increases of capital. Whenever the board of directors shall have any such increase of capital recorded in the form required by law, it shall have the amendment of this article as a result thereof recorded. Any such issue of shares shall be effected while reserving to holders of shares the preferential right to subscribe for such newly issued shares, except: (a) in circumstances in which the shares are issued for a consideration other than money;

(b) with respect to shares issued as compensation to directors, officers, agents, or employees of the company, its subsidiaries or affiliates, and (c) with respect to shares issued to satisfy conversion or option rights created to provide compensation to directors, officers, agents, or employees of the corporation, its subsidiaries or affiliates.

Any shares to be issued for the purposes set forth in (b) and (c) shall not exceed 1.5% of the issued capital of the Company.

Each share entitles the holder thereof to cast one vote at any shareholders’ meeting.

The board of directors may authorize the issuance of bonds which may be but are not required to be, convertible into registered shares, in such denominations and payable in such monies as it shall determine in its discretion. The board of directors shall determine the type, price, interest rates, terms of issuance and repayment and any other conditions for such issues. A register of registered bonds shall be held at the registered office of the Company.

Article 6. Shares. The shares shall be in registered form. The board of directors may issue registered share certificates.

The shares may be entered without serial numbers into fungible securities accounts with financial institutions or other professional depositaries. The shares held in deposit or on an account with such financial institution or professional depositary shall be recorded in an account opened in the name of the depositor and may be transferred from one account to another, whether such account is held by the same or a different financial institution or depositary. The depositor whose shares are held through such fungible securities accounts shall have the same rights and obligations as if his shares were recorded in the registered share register of the Company.

PAGE 3

Transfer of registered shares, carried in the registered share register and which are not held through fungible securities accounts, shall be effected by a written declaration of transfer signed by the transferor and the transferee or by their attorneys. The board of directors may accept and enter in the register a transfer on the basis of any appropriate document(s) recording the transfer between the transferor and the transferee.

For the exercise of rights against it as well as for the exercise of rights to vote at general meetings and all rights conferred upon the shareholders, the Company shall recognize only one single owner per share. If there are several owners of a share, the company shall be entitled to suspend the exercise of the rights attached thereto until one person is designated as being the owner of such share with regard to the Company or until a single representative of the owners representing them towards the Company has been appointed.

The rights and obligations attached to any share shall pass to any transferee thereof.

All communications and notices to be given to a registered shareholder shall be deemed validly made to the latest address communicated by the shareholder to the Company.

Article 7. Changes of Share Capital. The subscribed and the authorized capital of the Company may be increased or reduced by decision of the shareholders in general meeting whose resolutions shall be taken in the manner required for the amendment of the Articles.

Title III.- Management, Supervision

Article 8. Board of Directors. The Company shall be managed by a board of directors consisting of a minimum of three (3) members and a maximum of fifteen (15) members appointed by the general meeting. In case the shares of the Company are listed on a regulated market, the minimum number of directors shall be five (5). The terms of their office shall not exceed one (1) year; they may be reappointed and dismissed at any time, with or without cause.

In the case of a vacancy in any position as director, the remaining directors shall have the right to temporarily fill such vacancy by a majority vote; in such case the next general meeting shall be called upon to ratify such election.

Any director elected in replacement of another, whose term of office has not expired, shall complete the term of office of the director whom he replaces.

Article 9. Procedure. The board of directors shall elect a chairman from among its members and, if considered appropriate, one or several vice-chairmen and shall determine the period of their office, not exceeding their appointment as director.

The board of directors shall meet as often as required by the interests of the Company and at least four (4) times per year, upon notice by the chairman or by two (2) directors, either at the registered office or at any other place indicated in the notice, under the chairmanship of the chairman or, if the latter is prevented from attending, under the chairmanship of the (any) vice-chairman or of the director chosen among his colleagues.

PAGE 4

The board of directors may deliberate and act validly only if a majority of its members in office are present in person or by proxy.

Board of directors meetings can be validly held by means of telephonic conference call, video conference or any other means genuinely allowing for the participation, interaction and intercommunication of the attending directors.

Any director who is prevented or absent may give a proxy in writing, telegram or facsimile, to one of his colleagues on the board to represent him at the meetings of the board and to vote in his place and stead.

All decisions shall be taken by a majority of votes of those present or represented; in case of a tie the chairman has a casting vote.

Written decisions, signed by all the directors, are proper and valid as though they had been taken at a meeting of the board of directors duly convened and held. Such a decision can be documented by several separate instruments having the same tenor, each signed by one or more directors.

The Board of Directors may appoint a secretary and one or more assistant secretaries and determine their responsibilities, powers and authorities. These secretaries and assistant secretaries need not be members of the Board of Directors.

Article 10. Minutes of the Board. The proceedings of the board of directors shall be set forth in minutes signed by the chairman of the meeting and the secretary, or by the majority of persons present at the meeting. The proxies shall be annexed thereto.

Copies of these minutes, or excerpts thereof, as well as any other document of the Company, shall be certified by two (2) directors or by the secretary of the board of directors or by any assistant secretary.

Article 11. Powers. The board of directors is invested with the broadest powers to act on behalf of the Company and accomplish or authorize all acts and transactions of management and disposal which are within its corporate purpose and which are not specifically reserved to the general meeting.

The Company will be bound by the joint signature of two directors or the sole signature of any persons to whom such signatory power shall be delegated by the board of directors.

The board of directors is invested with the power to interpret and apply the present Articles of Association and to issue guidelines and rules for that purpose.

Within the limits of applicable law, the board of directors may: 1. delegate to one or more persons, whether or not members of the board of directors, the powers necessary to carry out its decisions and to provide day-to-day management; provided that the approval of material transactions with related parties shall not be delegated and the opinion of the Audit Committee on such material transactions shall be taken into consideration prior to their approval by the board of directors;

2. confer to one or more persons, whether or not members of the board of directors, the powers deemed to be appropriate for the general technical, administrative and commercial management of the Company;

3. constitute an Audit Committee, made up by directors, determining its function and authority;

PAGE 5

4. constitute any committee, the members of which may be selected either from among the directors or outside thereof, and determine their functions and authority.

The board may authorize all substitutions in the powers it may confer or has conferred.

In case the shares of the Company are listed on a regulated market, the Company shall have an Audit Committee composed of three members, two of which, at least, shall qualify as Independent Directors. The members of the Audit Committee shall not be eligible to participate in any incentive compensation plan for employees of the Company or any of its subsidiaries. The Audit Committee shall (I) assist the board of directors in fulfilling its oversight responsibilities relating to the integrity of the financial statements of the Company, the Company’s system of internal controls and the independence and performance of the Company’s internal and independent auditors. It shall also perform the other duties entrusted to it by the board of directors, particularly as regards relations with the independent auditor and (II) review material transactions between the Company or its subsidiaries with related parties to determine whether their terms are consistent with market conditions or are otherwise fair to the Company and its subsidiaries. To that end, (A) the term «material» shall mean (a) any transaction, or series of transactions within the period of one year prior to the determination, by which the Company or any of its subsidiaries would be required to pay or would receive aggregate sums in excess of 1.5% of the Company’s consolidated net sales made in the fiscal year preceding the year on which the determination is made or (b) any corporate reorganization transaction (including a merger, spin-off or bulk transfer of a business) affecting the Company or any of its subsidiaries for the benefit of or involving also a related party;

and (B) the term «related party» shall mean any of the following persons in relation to the Company or the subsidiaries of the Company: (i) a member of the board of directors of the Company or of any of the subsidiaries; (ii) any company or person that controls directly or indirectly the Company or is a member of the board of directors of a company controlling directly or indirectly the Company; (iii) any company or person that holds a significant interest in the equity of the Company or of a subsidiary of the Company; (iv) spouses, parents, siblings or relatives up to the third degree of any person referred to in (i), (ii) or (iii); and (v) companies in whose equity the persons referred in (i) and (iii) hold a significant interest.

The board of directors shall appoint one of the members of the Audit Committee as its Chairman. The Audit Committee shall report to the board of directors on its activity and the adequacy of the internal control system once a year, at the time the annual accounts are approved.

For the purpose of the present Articles of Association, the term «Independent Director» shall mean a director who: (i) is not, and has not been employed by the Company or its subsidiaries in an executive capacity, within the five years immediately prior to the annual meeting at which the nominees of the board of directors will be voted upon;

(ii) is not a person that directly or indirectly controls the Company and is not a member of the board of directors of a company controlling directly or indirectly the Company;

PAGE 6

(iii) has not (and is not affiliated with a company or a firm that has) a significant business relationship with the Company, its subsidiaries or the person that directly or indirectly controls the Company;

(iv) is not, and has not been affiliated with or employed by a (present or former) auditor of the Company, its subsidiaries or the person that directly or indirectly controls the Company, within the five years immediately prior to the annual meeting at which the nominees of the board of directors will be voted upon;

(v) is not a spouse, parent, sibling or relative up to the third degree of any person above described from (i) to (v).

Article 12. Directors’ Remuneration. The remuneration of the board of directors will be decided by the general meeting.

The Company shall, to the fullest extent permitted by Luxembourg law, indemnify any director or officer, as well as any former director or officer, against all costs, charges and expenses, reasonably incurred by him in connection with the defense or settlement of any civil, criminal or administrative action, suit or proceeding to which he may be made a party by reason of his being or having been a director or officer of the Company, if (i) he acted honestly and in good faith, and (ii) in the case of criminal or administrative proceedings, he had reasonable grounds for believing that his conduct was lawful. Notwithstanding the foregoing, the current or former director or officer will not be entitled to indemnification in case of an action, suit or proceeding brought against him by the Company or in case he shall be finally adjudged in an action, suit or proceeding to be liable for gross negligence, wilful misconduct, fraud, dishonesty or any other criminal offence. Furthermore, in case of settlement, the current or former director or officer will only be entitled to indemnification hereunder, if he settles such action, suit or proceeding in good faith and in a manner he reasonably believes to be in or not opposed to the best interests of the Company and if notice of the intention of settlement of such action, suit or proceeding is given to the Company at least 10 business days prior to such settlement.

Article 13. Auditors. The annual accounts of the Company shall be audited by one or more independent auditors, appointed by the general meeting of shareholders among the members of the Institute of Independent Auditors (Institut des réviseurs d’entreprises). The general meeting shall determine their number and the term of their office which shall not exceed one (1) year. They may be reappointed and dismissed at any time.

As a result of the preceding and by application of article 256(3) of the Luxembourg law governing commercial companies, the office of the statutory auditor (commissaire) is eliminated.

Title IV.- General Meetings

Article 14. Powers. The general meeting, duly constituted, represents all of the shareholders. It has the broadest powers to carry out or ratify acts of concern to the Company.

Article 15. Date and Place. The annual general meeting shall meet each year in the city of Luxembourg at the place indicated in the notices of meeting on the first Wednesday of May at 11:00 a.m. If such day falls on a legal or banking holiday in Luxembourg, the general shareholders meeting shall be held on the first business day thereafter.

PAGE 7

The general Meetings, including the annual general meeting, may be held in a foreign country whenever there occur circumstances of force majeure as determined by the board of directors in its discretion. In such event, the terms and conditions necessary to provide proper deliberations and publications will continue to be those provided for by the laws of Luxembourg.

Article 16. Notices of Meeting. The board of directors shall convene all general meetings.

The notices for any ordinary or extraordinary general meeting shall contain the agenda, the hour and the place of the meeting and shall be made by notices published twice (2) at least at ten (10) days interval and ten (10) days before the meeting in the Memorial C, Recueil des Sociétés et Associations (Luxembourg Official Gazette) and in a leading newspaper having general circulation in Luxembourg. In case the shares of the Company are listed on a foreign regulated market, the notices shall, in addition, (subject to applicable regulations) either (i) be published once in a leading newspaper having general circulation in the country of such listing at the same time as the first publication in Luxembourg or (ii) follow the market practices in such country regarding publicity of the convening of a general meeting of shareholders.

The Company shall not be obliged to send notices by registered or ordinary mail to the holders of its Shares.

Article 17. Admission. Shall be admitted to the general meetings, any shareholder who holds one or more share(s) of the Company on the fifth (5th) calendar day preceding the general meeting (the «Record Date»). Shareholders who have sold their shares between the Record Date and the date of the general meeting, must not attend or be represented at such meeting. In case of breach of such prohibition, criminal sanctions may apply.

In case of shares held through fungible securities accounts, as described in Article 6 of these Articles of Association, each shareholder may exercise all rights attached to his share(s) and in particular participate in and vote at the shareholders’ meeting of the Company, upon presentation of a certificate issued by the financial institution or professional depositary holding the shares, certifying the number of shares recorded in the relevant account on the Record Date.

Such certificate must be filed at least five (5) days before the meeting with the Company at its registered address or at the address included in the convening notice or, in case the shares of the Company are listed on a foreign regulated market, with an agent of the Company located in the country of the listing and designated in the convening notice. In the event that the shareholder votes through proxy, the latter has to deposit his proxy within the same period of time at the registered office of the Company or with any local agent of the Company, duly authorized to receive such proxies.

The board of directors and the shareholders’ meeting may, if it deems it advisable, reduce these periods of time for all shareholders and admit all shareholders (or their proxies) who have filed the appropriate documents to the general meeting irrespective of these time limits.

Article 18. Procedure. Every general meeting will be presided over by the chairman pro tempore appointed by the general meeting. The general meeting will appoint a scrutineer who shall keep the attendance list.

PAGE 8

The board of the general meeting so constituted shall designate the secretary.

Irrespective of the agenda, the board of directors may adjourn any ordinary or extraordinary general meeting in accordance with the formalities and time limits stipulated for by law.

Article 19. Vote and Minutes. Resolutions at ordinary general meetings will be passed by majority vote, irrespective of the number of shares present or represented.

Extraordinary general meetings shall not validly deliberate on proposed amendments to the Articles of Association unless at least half of the share capital is present or represented. Resolutions as to amendments of the Articles of Association shall be voted if approved by a two-thirds majority of votes of the shareholders present or represented.

If the required presence quorum is not met, a second meeting may be convened by means of notices published twice, at twenty (20) days interval at least and twenty (20) days before the meeting in the Memorial, Recueil des Sociétés et Associations, two newspapers having general circulation in Luxembourg and, in case the shares of the Company are listed on a foreign regulated market, the notices shall in addition be published once in a leading newspaper having general circulation in the country of such listing at the same time as the first publication in Luxembourg. The second meeting shall validly deliberate regardless of the quorum present or represented. Resolutions, in order to be adopted, must be carried by a two thirds majority of the votes of the shareholders present or represented.

The nationality of the Company may be changed and the commitments of its shareholders may be increased only with the unanimous consent of all the shareholders and bondholders, if any.

Minutes of the general meetings shall be signed by the members of the board of the meeting. Copies or excerpts of the minutes to be produced in court or elsewhere shall be signed by two (2) directors or by the secretary of the board of directors or by any assistant secretary.

Title V.- Financial Year, Distribution of Profits

Article 20. Financial Year. The financial year will run from the first (1st) of January of each year until the thirty-first (31st) of December of the same year.

Each year, the management will cause an inventory to be drawn up with current and fixed assets together with all debts and liabilities of the Company, accompanied by an annex containing a summary of all corporate commitments and all debts of the directors towards the Company.

The management will prepare the balance sheet, the profit and loss statement and the notes to the accounts and remit those documents within the legal time limit to the auditors.

Twenty (20) days before the general meeting, the shareholders may take cognizance at the registered office of the annual accounts and the report of auditor(s).

PAGE 9

Article 21. Distribution of profits. The surplus after deduction of charges and amortizations represents the net profit at the disposal of the general meeting for free allocation.

The board of directors may initiate dividend instalments in accordance with applicable provisions of law.

Dividends decided by the general meeting as well as dividend instalments for the current financial year decided by the board of directors in accordance with the law, are paid at the periods and places fixed by the board of directors.

The payment of the dividends to a depositary having as principal activity the operation of a settlement system in relation to transactions on securities, dividends, interest, matured capital or other matured monies of securities or of other financial instruments being handled through the system of such depositary, discharges the Company. Said depositary shall distribute these funds to his depositors according to the amount of securities or other financial instruments recorded in their name.

Title VI.- Appraisal rights

Article 22. Appraisal rights.

(A) In case the general meeting approves (i) the de-listing of the Company’s shares from all regulated markets where the Company’s shares are listed at that time (ii) consummation of a merger in which the Company is not the surviving person (unless the shares or other equity securities of such person are listed in the New York or London stock exchanges);

(iii) consummation of a sale, lease, exchange or other disposition of all or substantially all of the assets of the Company; (iv) amendment of the articles of association that has the effect of changing materially the Company’s corporate purpose; (v) relocation of the Company’s domicile outside of the Grand Duchy of Luxembourg; (vi) amendments to the Articles of Association that restrict the rights of the shareholders, dissenting or absent shareholders shall have the right to have their shares purchased by the Company at (a) the average market value of the ninety (90) calendar days preceding the general meeting or (b) in the event that the shares of the Company are not traded in any regulated market, the amount that results from applying the proportion of the Company’s equity that the shares being sold represent over of the Company’s net worth on the day of the general meeting. The Company must consummate the purchase in this clause (a) of this Article within six (6) months following the date of the general meeting. Dissenting or absent shareholders must present their claim within one (1) month following the date of the general meeting and supply the Company with evidence of their share holding at the date of the general meeting. Shareholders which voted in favor of the relevant resolution are not entitled to the right provided in this article.

(B) In case the general meeting approves the de-listing from one or more, but not all, of the regulated markets where the Company’s shares are listed, only dissenting or absent shareholders with shares held through participants in the local clearing system for that market at the earlier of (i) the date of the public announcement by the Company of the intention to make the de-listing or (ii) the date of the publication of the call for the general meeting that approved such de-listing will be entitled to have their shares repurchased by the Company in accordance with clause (a) of this Article.

PAGE 10

Dissenting or absent shareholders must present their claim within one (1) month following the date of the general meeting and supply the Company with evidence of their share holding at the earlier of (i) the date of the public announcement by the Company of the intention to make the de-listing or (ii) the date of the publication of the call to the general meeting.

Shareholders which voted in favor of the relevant resolution are not entitled to this appraisal right.

(C) Article 49-3(1)(d) of the Luxembourg law governing commercial companies shall apply in case the shareholders exercise their appraisal right.

Title VII.- Dissolution, Liquidation

Article 23. Dissolution. The board of directors may, at any time, propose to the extraordinary general meeting the dissolution of the Company.

Article 24. Liquidation. Upon the dissolution of the Company, the liquidation shall be effected by one or more liquidators, natural persons or legal entities, appointed by the general meeting, which shall determine their powers and their remuneration.

Title VIII.- General Previsions

Article 25. Applicable law. All points not covered by the present Articles of Association shall be governed by Luxembourg law.

PAGE 11

Statement Explaining Calculation of Ratios

Exhibit 7.1

Tenaris – Liquid financial assets over total assets


Thousands of U.S. Dollars	December 31, 2010			December 31, 2009
Cash and cash equivalents		843,861			1,542,829

Other investments (current)		676,224			579,675


Liquid financial assets		1,520,085			2,122,504

Total assets		14,364,331			13,483,308

Ratio		10.6	%		15.7	%

Tenaris – Total Liabilities to Total Assets Ratio


Thousands of U.S. Dollars	December 31, 2010		December 31, 2009		December 31, 2008
Total liabilities		3,813,751		3,762,472		6,398,825

Total Assets		14,364,331		13,483,308		15,100,712


Ratio		0.27		0.28		0.42

Tenaris – Current debt to total debt


Thousands of U.S. Dollars	December 31, 2010		December 31, 2009
Current Borrowings		1,023,926		791,583

Total Borrowings		1,244,496		1,446,764


Ratio		0.82		0.55

List of Subsidiaries of Tenaris S.A.

Exhibit 8.1

Tenaris – List of subsidiaries of Tenaris S.A.

Major operating subsidiaries


			Percentage Ownership
Company	Country of Organization	Main Activity	2010			2009			2008

Algoma Tubes Inc.	Canada	Manufacture of seamless steel pipes		100	%		100	%		100	%

Confab Industrial S.A. ^(a)	Brazil	Manufacture of welded steel pipes and capital goods		41	%		40	%		40	%

Dalmine S.p.A	Italy	Manufacture of seamless steel pipes		99	%		99	%		99	%

Hydril Company	U.S.A.	Manufacture and marketing of premium connections		100	%		100	%		100	%

Maverick Tube Corporation	U.S.A.	Manufacture of welded steel pipes		100	%		100	%		100	%

NKKTubes K.K.	Japan	Manufacture of seamless steel pipes		51	%		51	%		51	%

Prudential Steel ULC	Canada	Manufacture of welded steel pipes		100	%		100	%		100	%

S.C. Silcotub S.A.	Romania	Manufacture of seamless steel pipes		100	%		100	%		100	%

Siat S.A.	Argentina	Manufacture of welded steel pipes		82	%		82	%		82	%

Siderca S.A.I.C.	Argentina	Manufacture of seamless steel pipes		100	%		100	%		100	%

Tavsa, Tubos de Acero de Venezuela S.A.^(b)	Venezuela	Manufacture of seamless steel pipes		—			—			70	%

Tenaris Coiled Tubes LLC (and predecessors)	U.S.A.	Manufacture of coiled tubing		100	%		100	%		100	%

Tenaris Financial Services S.A.	Uruguay	Financial services		100	%		100	%		100	%

Tenaris Global Services S.A.	Uruguay	Holding company and marketing of steel pipes		100	%		100	%		100	%

Tenaris Investments Ltd.	Ireland	Holding company and financial services		100	%		100	%		100	%

Tubos de Acero de México S.A.	Mexico	Manufacture of seamless steel pipes		100	%		100	%		100	%

Tubos del Caribe Ltda.	Colombia	Manufacture of welded steel pipes		100	%		100	%		100	%

(a)	Tenaris holds 99% of the voting shares of Confab Industrial S.A.

(b)	In 2009, the Venezuelan government announced the nationalization of Tavsa. For more information on the Tavsa nationalization process, see note 32 “Processes in Venezuela-Nationalization of Venezuelan Subsidiaries” to our audited consolidated financial statements included in this annual report.

Certification of Chief Executive Officer pursuant to Section 302

Exhibit 12.1

CERTIFICATE

I, PAOLO ROCCA, CERTIFY THAT:

1.	I have reviewed this annual report on Form 20-F of Tenaris S.A.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

The company’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f) for the company and have:

(a)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the company, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b)

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c)

Evaluated the effectiveness of the company’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d)

Disclosed in this report any change in the company’s internal control over financial reporting that occurred during the period covered by the annual report that has materially affected, or is reasonably likely to materially affect, the company’s internal control over financial reporting; and

5.	The company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of company’s board of directors (or persons performing the equivalent functions):

(a)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the company’s ability to record, process, summarize and report financial information; and

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: June 30, 2011


/s/ Paolo Rocca
Name:		Paolo Rocca
Title:		Chief Executive Officer

Certification of Chief Financial Officer pursuant to Section 302

Exhibit 12.2

CERTIFICATE

I, RICARDO SOLER, CERTIFY THAT:

1.	I have reviewed this annual report on Form 20-F of Tenaris S.A.;

2.	Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.	Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the company as of, and for, the periods presented in this report;

(a)

(b)

(c)

(d)

5.	The company’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the company’s auditors and the audit committee of company’s board of directors (or persons performing the equivalent functions):

(a)

(b)

Any fraud, whether or not material, that involves management or other employees who have a significant role in the company’s internal control over financial reporting.

Date: June 30, 2011


/s/ Ricardo Soler
Name:		Ricardo Soler
Title:		Chief Financial Officer

Certification of Chief Executive Officer pursuant to Section 906

Exhibit 13.1

CERTIFICATION

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(SUBSECTIONS (A) AND (B) OF SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE)

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code), the undersigned officer of Tenaris S.A. (the “Company”), hereby certifies, to such officer’s knowledge, that the Company’s Annual Report on Form 20-F for the year ended December 31, 2010 (the “Report”), fully complies with the requirements of section 13(a) or 15(d), as applicable, of the Securities Exchange Act of 1934 and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.


Date:	June 30, 2011	/s/ Paolo Rocca
		Name:	Paolo Rocca
		Title:	Chief Executive Officer

The foregoing certification is being furnished solely pursuant to section 906

of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States

Code) and is not being filed as part of the Report or

as a separate disclosure document.

Certification of Chief Financial Officer pursuant to Section 906

Exhibit 13.2

CERTIFICATION

PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

(SUBSECTIONS (A) AND (B) OF SECTION 1350, CHAPTER 63 OF TITLE 18, UNITED STATES CODE)


Date:	June 30, 2011	/s/ Ricardo Soler
		Name:	Ricardo Soler
		Title:	Chief Financial Officer

The foregoing certification is being furnished solely pursuant to section 906

of the Sarbanes-Oxley Act of 2002 (subsections (a) and (b) of section 1350, chapter 63 of title 18, United States

Code) and is not being filed as part of the Report or

as a separate disclosure document.

Consent of Independent Registered Public Accounting Firm

Exhibit 15.1

LOGO

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form F-3 (No. 333-171751) of our report dated June 30, 2011 relating to the financial statements and the effectiveness of internal control over financial reporting, which appears in this Form 20-F. We also consent to the reference to us under the heading “Selected Financial Data” in this Form 20-F.

Buenos Aires, Argentina

June 30, 2011


PRICE WATERHOUSE & CO. S.R.L.

by /s/ Diego M. Niebuhr
		Diego M. Niebuhr (Partner)

Price Waterhouse & Co. S.R.L., Bouchard 557, piso 8°, C1106ABG - Ciudad de Buenos Aires

T: +(54.11) 4850.0000, F: +(54.11) 4850.1800, www.pwc.com/ar

Consent of PWC Argentina

Exhibit 15.2

LOGO

June 30, 2011

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We have read the statements made by Tenaris S.A. (copy attached), which we understand will be filed with the Securities and Exchange Commission, pursuant to Item 16-F of Form 20-F, as part of the Form 20-F of Tenaris S.A. dated June 30, 2011. We agree with the statements concerning our Firm in such Form 20-F.

Very truly yours,


PRICE WATERHOUSE & CO. S.R.L.

by /s/ Diego M. Niebuhr
		Diego M. Niebuhr (Partner)

Price Waterhouse & Co. S.R.L., Bouchard 557, piso 8°, C1106ABG - Ciudad de Buenos Aires

T: +(54.11) 4850.0000, F: +(54.11) 4850.1800, www.pwc.com/ar