EX-8.1 3 d338956dex81.htm LIST OF SUBSIDIARIES OF TENARIS S.A.

List of Subsidiaries of Tenaris S.A.

Exhibit 8.1

Tenaris – List of subsidiaries of Tenaris S.A.

Significant operating subsidiaries

We conduct all our operations through subsidiaries. The following table shows the significant operating subsidiaries of the Company and its direct and indirect ownership in each subsidiary as of December 31, 2011, 2010 and 2009.

						Percentage Ownership
Company		Country of Organization		Main Activity		2011				2010				2009
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	%			41	%			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	%
PT Seamless Pipe Indonesia Jaya		Indonesia		Manufacture of seamless steel pipes			77	%			77	%			77	%
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	%
Tenaris Coiled Tubes LLC (and predecessors)		U.S.A.		Manufacture of coiled tubing			100	%			100	%			100	%
Tenaris Connection Limited		St. Vincent & Grenadines		Ownership and licensing of technology			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 S.àr.l Luxembourg, Zug Branch		Switzerland		Holding company and financial services			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) As of April 26, 2012, Tenaris holds 95.9% of the shares of Confab Industrial S.A., or Confab. For more information on the Confab delisting, see “Recent Developments – Tenaris accomplishes Confab delisting”.