Tenaris S.A., organized in Luxembourg, is a manufacturer and supplier of steel pipes and related services for the petroleum industry.

[1] The company is 60.45% owned by Techint, which is controlled by San Faustin S.A., which is in turn controlled by Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin, a Stichting, while 38.41% of the company is publicly-traded.

[1] Tenaris traces its roots to the formation of Siderca, the sole Argentine producer of seamless steel pipe products by the predecessor of San Faustin in 1948.

[7] In May 2011, Tenaris agreed to pay the United States Department of Justice US$8.9 million in the first ever deferred prosecution agreement with the U.S. Securities and Exchange Commission, after Tenaris voluntarily disclosed details of bribes made to officials of an Uzbek state-controlled oil firm to obtain competitor's bid information, which it used to submit revised bids in order to secure tenders.

[8][9][10] On several occasions, melees broke out at the TenarisTamsa facility in Veracruz, Mexico, over a dispute for union leadership between Pascual Lagunes Ochoa and José Carlos Guevara Malpica ("El Profe"), a convicted felon.