LUXEMBOURG -- (Marketwired) -- 05/18/15 -- Tenaris S.A. Tenaris S.A. (NYSE: TS) (BAE: TS) (BMV: TS) (MILAN: TEN) (the "Company") has revised its value in use calculation for its investment in Usinas Siderúrgicas de Minas Gerais S.A. - Usiminas ("Usiminas") and will restate its financial statements to reduce the carrying amount of the Usiminas investment to USD122 million as of September 30, 2014. As a result of this restatement, the financial statements at December 31, 2014 and March 15, 2015 will also be restated to reflect the lower carrying value of the Usiminas investment. Tenaris's cash flows are not affected.

These actions follow the conclusion of previously disclosed discussions with the Staff of the U.S. Securities and Exchange Commission regarding Staff comments relating to the carrying value of the Company's investment in Usiminas under IFRS as of September 30, 2014 and subsequent periods. The Staff had requested information regarding Tenaris's value in use calculations and the differences between the value in use carrying amounts and certain fair value indicators, including in particular the purchase price of BRL12 (approximately USD4.8) per share which the Company's affiliate Ternium S.A. paid in October 2014 for the acquisition of 51.4 million additional Usiminas ordinary shares from Caixa de Previdência dos Funcionários do Banco do Brazil - PREVI ("PREVI"). In connection with these discussions, the Company revised the assumptions used to calculate the carrying value of the Usiminas investment at September 30, 2014 in light of the Staff's comment that the PREVI transaction price provided objective evidence of the value of the Usiminas investment. The restated carrying value as of September 30, 2014 has been revised to reflect a per share value equal to the PREVI transaction price.

The expected impact of this restatement on the Company's previously issued financial statements will be as follows:

The following chart shows the Company's carrying values of the Usiminas investment on a per-share basis, compared to the book value resulting from Usiminas' financial statements under IFRS and the quoted market price of the Usiminas ordinary shares, at each of September 30 and December 31, 2014, and March 31, 2015:

The Company will file its Annual Report on Form 20-F for the year ended December 31, 2014 as soon as practicable upon the issuance of its restated financial statements and the completion of the audit of such financial statements by its registered public accounting firm, PricewaterhouseCoopers, Société Cooperative. The Company also expects that its revision of the carrying value of the Usiminas investment will be treated as a material weakness in its internal control over financial reporting. It is currently expected that the filing of the Form 20-F will occur on or before June 1, 2015.

Some of the statements contained in this press release are "forward-looking statements". Forward-looking statements are based on management's current views and assumptions and involve known and unknown risks that could cause actual results, performance or events to differ materially from those expressed or implied by those statements. These risks include but are not limited to risks arising from uncertainties as to future oil and gas prices and their impact on investment programs by oil and gas companies.

Giovanni Sardagna
Tenaris
1-888-300-5432
www.tenaris.com

Source: Tenaris S.A.

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