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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
Under the Securities Exchange Act of 1934
(Amendment No. )*
Tenaris SA
(Name of Issuer)
American Depositary Receipt
(Title of Class of Securities)
88031M109
(CUSIP Number)
December 31, 2010
(Date of Event Which Requires Filing of this Statement)
Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:
[X] Rule 13d-1(b)
[ ] Rule 13d-1(c)
[ ] Rule 13d-1(d)
*The remainder of this cover page shall be filled out for a reporting
person's initial filing on this form with respect to the subject class
of securities, and for any subsequent amendment containing information
which would alter the disclosures provided in a prior cover page.
The information required in the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of
that section of the Act but shall be subject to all other provisions of
the Act (however, see the Notes).
CUSIP: 88031M109 Page 1 of 4
1 NAMES OF REPORTING PERSONS
I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Capital World Investors **
2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE
INSTRUCTIONS) (a)
(b)
3 SEC USE ONLY
4 CITIZENSHIP OR PLACE OF ORGANIZATION
Delaware
5 SOLE VOTING POWER
59,047,436
6 SHARED VOTING POWER
NUMBER OF
SHARES NONE
BENEFICIALL
Y OWNED BY
7 SOLE DISPOSITIVE POWER
EACH
REPORTING 61,487,436
PERSON
WITH:
8 SHARED DISPOSITIVE POWER
NONE
9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
61,487,436 Beneficial ownership disclaimed pursuant to Rule
13d-4
10 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES
(SEE INSTRUCTIONS)
11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9
5.2%
12 TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
IA
** A division of Capital Research and Management Company (CRMC)
CUSIP: 88031M109 Page 2 of 4
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549
Schedule 13G
Under the Securities Exchange Act of 1934
Amendment No.
Item 1(a) Name of Issuer:
Tenaris SA
Item 1(b) Address of Issuer's Principal Executive Offices:
46A, Avenue John F. Kennedy
L-1855 Luxembourg
Attn: Company Secretary
Item 2(a) Name of Person(s) Filing:
Capital World Investors
Item 2(b) Address of Principal Business Office or, if none,
Residence:
333 South Hope Street
Los Angeles, CA 90071
Item 2(c) Citizenship: N/A
Item 2(d) Title of Class of Securities:
American Depositary Receipt
Item 2(e) CUSIP Number:
88031M109
Item 3 If this statement is filed pursuant to sections 240.13d-1(b)
or 240.13d-2(b) or (c), check whether the person filing is a:
(e) [X] An investment adviser in accordance with
section 240.13d-1(b)(1)(ii)(E).
Item 4 Ownership
Provide the following information regarding the aggregate
number and percentage of the class of securities of the issuer
identified in Item 1.
(a) Amount beneficially owned:
(b) Percent of class:
(c) Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
(ii) Shared power to vote or to direct the vote:
(iii) Sole power to dispose or to direct the disposition of:
(iv) Shared power to dispose or to direct the disposition of:
See page 2
Capital World Investors is deemed to be the beneficial owner of
61,487,436 shares or 5.2% of the 1,180,536,830 shares of
American Depositary Receipt believed to be outstanding as a
result of CRMC acting as investment adviser to various
investment companies registered under Section 8 of the
Investment Company Act of 1940.
CUSIP: 88031M109 Page 3 of 4
Shares reported by Capital World Investors include 29,448,718
American Depositary Shares, representing 61,337,436 shares of
the Ordinary Shares.
Item 5 Ownership of Five Percent or Less of a Class. If this
statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial
owner of more than five percent of the class of securities,
check the following: [ ]
Item 6 Ownership of More than Five Percent on Behalf of Another
Person: N/A
Item 7 Identification and Classification of the Subsidiary Which
Acquired the Security Being Reported on By the Parent Holding
Company or Control Person: N/A
Item 8 Identification and Classification of Members of the Group:
N/A
Item 9 Notice of Dissolution of Group: N/A
Item 10 Certification
By signing below, I certify that, to the best of my knowledge
and belief, the securities referred to above were acquired and
are held in the ordinary course of business and were not
acquired and are not held for the purpose of or with the effect
of changing or influencing the control of the issuer of the
securities and were not acquired and are not held in connection
with or as a participant in any transaction having that purpose
or effect.
Signature
After reasonable inquiry and to the best of my knowledge and
belief, I certify that the information set forth in this
statement is true, complete and correct.
Date: February 9, 2011
Signature: Robert W. Lovelace***
Name/Title: Robert W. Lovelace - Senior Vice
President
Capital World Investors
***By /s/ Walter R. Burkley
Walter R. Burkley
Attorney-in-fact
Signed pursuant to a Power of Attorney dated December 20,
2010 included as an Exhibit to Schedule 13G filed with the
Securities and Exchange Commission by Capital World Investors
on January 10, 2011 with respect to Georgia Gulf Corporation.
CUSIP: 88031M109 Page 4 of 4