The Financial and Operational Information Contained in This Press Release Is Based on Audited Consolidated Financial Statements Presented in U.S. Dollars and Prepared in Accordance with International Financial Reporting Standards as Issued by the International Accounting Standard Board and Adopted by the European Union, or IFRS

LUXEMBOURG -- (Marketwire) -- 02/04/13 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (BVM: TS) (MILAN: TEN) ( Tenaris ) announced that its Brazilian subsidiary Confab Industrial S.A. (Confab) was notified of a lawsuit filed in Brazil by Companhia Siderúrgica Nacional (CSN) and various entities affiliated

The Financial Information Contained in This Press Release Is Based on Unaudited Consolidated Condensed Interim Financial Statements Presented in U.S. Dollars (US$) and Prepared in Accordance With International Financial Reporting Standards as Issued by the International Accounting Standard Board and Adopted by the European Union, or IFRS

The Financial Information Contained in This Press Release Is Based on Unaudited Consolidated Condensed Interim Financial Statements Presented in U.S. Dollars (US$) and Prepared in Accordance With International Financial Reporting Standards as Issued by the International Accounting Standard Board and Adopted by the European Union, or IFRS

LUXEMBOURG -- (Marketwire) -- 06/21/12 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (BVM: TS) (MILAN: TEN) ("Tenaris") announced today an investment plan to expand its U.S. operations. The plan includes the installation of a state-of-the-art seamless pipe mill, heat treatment and premium threading

LUXEMBOURG -- (Marketwire) -- 05/02/12 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (BVM: TS) (MILAN: TEN) announced that its annual general meeting of shareholders approved today all resolutions on its agenda. Among other resolutions adopted at the meeting, the shareholders approved the consolidated

LUXEMBOURG -- (Marketwire) -- 04/30/12 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (BVM: TS) (MILAN: TEN) ("Tenaris") announces that it has filed its annual report on Form 20-F for the year ended December 31, 2011 with the U.S. Securities and Exchange Commission (SEC).

The Financial and Operational Information Contained in This Press Release Is Based on Unaudited Consolidated Financial Statements Presented in U.S. Dollars and Prepared in Accordance With International Financial Reporting Standards as Issued by the International Accounting Standard Board and Adopted by the European Union, or IFRS

LUXEMBOURG -- (Marketwire) -- 04/24/12 -- Tenaris S.A. (NYSE: TS) (BAE: TS) (BVM: TS) (MILAN: TEN) announced that, at the auction for its delisting tender offer to acquire all of the ordinary and preferred shares held by the public in its Brazilian subsidiary Confab Industrial S.A., or Confab,