Exhibit 8.1
Tenaris – List of subsidiaries of Tenaris S.A.
Principal subsidiaries
The following is a list of the Company’s subsidiaries and its direct and indirect percentage of ownership of each controlled company at December 31, 2006, 2005 and 2004.
Company | Country of Organization | Main activity | Percentage of ownership at December 31, | |||||||||||
2006 | 2005 | 2004 | ||||||||||||
Algoma Tubes Inc. | Canada | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||||||
Autoabastecedora de Gas Natural Bruno Pagliai S.A. de C.V. (b) | Mexico | Trading of energy | 100% | — | — | |||||||||
Colmena Conduit Ltda (b) (l) | Colombia | Manufacturing of welded steel pipes | 100% | — | — | |||||||||
Confab Industrial S.A. and subsidiaries (c) | Brazil | Manufacturing of welded steel pipes and capital goods | 39% | 39% | 39% | |||||||||
Dalmine Energie S.p.A. (h) (j) | Italy | Trading of energy | — | 100% | 100% | |||||||||
Dalmine Holding B.V. and subsidiaries | Netherlands | Holding company | 99% | 99% | 99% | |||||||||
Dalmine S.p.A. | Italy | Manufacturing of seamless steel pipes | 99% | 99% | 99% | |||||||||
Energy Network S.R.L. (a) | Romania | Trading of energy | 95% | 100% | — | |||||||||
Exiros S.A. | Uruguay | Procurement services for industrial companies | 100% | 100% | 100% | |||||||||
Information Systems and Technologies N.V. | Netherlands | Software development and maintenance | 75% | 75% | 75% | |||||||||
Information Systems and Technologies S.A. (d) | Argentina | Software development and maintenance | 100% | 100% | 100% | |||||||||
Inmobiliaria Tamsa S.A. de C.V. | Mexico | Leasing of real estate | 100% | 100 | % | 100 | % | |||||||
Insirger S.A. and subsidiaries (g) | Argentina | Electric power generation | — | — | 100 | % | ||||||||
Intermetal Com SRL | Romania | Marketing of Scrap and other raw materials | 100% | 100 | % | 100 | % | |||||||
Inversiones Berna S.A. (a) | Chile | Financial company | 100% | 100 | % | — | ||||||||
Inversiones Lucerna S.A. (a) | Chile | Financial company | 82% | 82 | % | — | ||||||||
Invertub S.A. and subsidiaries (g) | Argentina | Holding Company | — | — | 100 | % | ||||||||
Lomond Holdings B.V. and subsidiaries (k) | Netherlands | Procurement services for industrial companies | — | 100 | % | 100 | % | |||||||
Matesi, Materiales Siderurgicos S.A. (a) | Venezuela | Production of hot briquetted iron (HBI) | 50% | 50 | % | 50 | % | |||||||
Maverick Tube Corporation and subsidiaries (b) | U.S.A. | Manufacturing of welded steel pipes | 100% | — | — | |||||||||
Maverick Tube, L.P. (b) (l) | U.S.A. | Manufacturing of welded steel pipes | 100% | — | — |
Company | Country of Organization | Main activity | Percentage of ownership at December 31, | |||||||
2006 | 2005 | 2004 | ||||||||
Metalcentro S.A. (i) | Argentina | Manufacturing of pipe-end protectors and lateral impact tubes | — | 100% | 100% | |||||
Metalmecánica S.A. | Argentina | Manufacturing of steel products for oil extraction | 100% | 100% | 100% | |||||
NKK Tubes K.K. | Japan | Manufacturing of seamless steel pipes | 51% | 51% | 51% | |||||
Operadora Eléctrica S.A. (e) | Argentina | Electric power generation | 100% | 100% | 100% | |||||
Quality Tubes (UK) Ltd. (h) | United Kingdom | Marketing of steel products | 100% | 100% | 100% | |||||
Precision Tube Technology, L.P. (b) (l) | U.S.A. | Manufacturing of welded steel pipes | 100% | — | — | |||||
Prudential Steel Ltd. (b) (l) | Canada | Manufacturing of welded steel pipes | 100% | — | — | |||||
S.C. Donasid (a) | Romania | Manufacturing of steel products | 99% | 99% | — | |||||
S.C. Silcotub S.A. | Romania | Manufacturing of seamless steel pipes | 97% | 85% | 85% | |||||
Seacat, L.P. (b) (l) | U.S.A. | Manufacturing of welded steel pipes | 100% | — | — | |||||
Scrapservice S.A. | Argentina | Processing of scrap | 75% | 75% | 75% | |||||
Servicios Generales TenarisTamsa S.A. de C.V. (f) | Mexico | Handling and maintenance of steel pipes | 100% | 100% | 100% | |||||
Siat S.A. | Argentina | Manufacturing of welded steel pipes | 82% | 82% | 82% | |||||
Siderca International A.p.S. | Denmark | Holding company | 100% | 100% | 100% | |||||
Siderca S.A.I.C. | Argentina | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
Siderestiba S.A. (m) | Argentina | Logistics | — | 99% | 99% | |||||
Sidtam Limited | B.V.I. | Holding company | 100% | 100% | 100% | |||||
Siprofer A.G. (a) | Switzerland | Holding company | 100% | 100% | — | |||||
SO.PAR.FI Dalmine Holding S.A. | Luxembourg | Holding company | 99% | 99% | 99% | |||||
Sociedad Industrial Puntana S.A. | Argentina | Manufacturing of steel products | 100% | 100% | 100% | |||||
Socominter S.A. | Venezuela | Marketing of steel products | 100% | 100% | 100% | |||||
Socominter Ltda. | Chile | Marketing of steel products | 100% | 100% | 100% | |||||
Talta – Trading e Marketing Lda. | Madeira | Holding Company | 100% | 100% | 100% |
Company | Country of Organization | Main activity | Percentage of ownership at December 31, | |||||||
2006 | 2005 | 2004 | ||||||||
Tamdel LLC and subsidiaries (f) | Mexico | Holding company | 100% | 100% | 100% | |||||
Tamser S.A. de C.V. (f) | Mexico | Marketing of scrap | 100% | 100% | 100% | |||||
Tamsider LLC | U.S.A. | Holding company | 100% | 100% | 100% | |||||
Tamsider S.A. de C.V. and subsidiaries (g) | Mexico | Promotion and organization of steel-related companies and marketing of steel products | — | — | 100% | |||||
Tamtrade S.A.de C.V. (g) | Mexico | Marketing of steel products | — | — | 100% | |||||
Techint Investment Netherlands B.V. | Netherlands | Holding company | 100% | 100% | 100% | |||||
Tenaris Autopartes S.A. de C.V. | México | Manufacturing of supplies for the automotive industry | 100% | 100% | 100% | |||||
Tenaris Confab Hastes de Bombeio S.A. | Brazil | Manufacturing of steel products for oil extraction | 70% | 70% | 70% | |||||
Tenaris Connections A.G. and subsidiaries | Liechtenstein | Ownership and licensing of steel technology | 100% | 100% | 100% | |||||
Tenaris Financial Services S.A. | Uruguay | Financial Services | 100% | 100% | 100% | |||||
Tenaris Fittings S.A. de C.V. (previously Empresas Riga S.A. de C.V.) | Mexico | Manufacturing of welded fittings for seamless steel pipes | 100% | 100% | 100% | |||||
Tenaris Global Services B.V. | Netherlands | Sales agent of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (B.V.I.) Ltd. | B.V.I. | Holding company | 100% | 100% | 100% | |||||
Tenaris Global Services (Canada) Inc. | Canada | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services de Bolivia S.R.L. | Bolivia | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services Ecuador S.A. | Ecuador | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (Egypt) Ltd. (a) | Egypt | Marketing of steel products | 100% | 100% | — | |||||
Tenaris Global Services Far East Pte. Ltd. | Singapore | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (Japan) K.K. | Japan | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (Kazakhstan ) LLP | Kazakhstan | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services Korea | Korea | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services LLC | U.S.A. | Sales agent of steel products | 100% | 100% | 100% |
Company | Country of Organization | Main activity | Percentage of ownership at December 31, | |||||||
2006 | 2005 | 2004 | ||||||||
Tenaris Global Services Nigeria Ltd. | Nigeria | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services Norway AS | Norway | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (Panama) S.A. | Panama | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services S.A. | Uruguay | Holding company and marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (UK) Ltd. | United Kingdom | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Global Services (U.S.A.) Corporation | U.S.A. | Marketing of steel products | 100% | 100% | 100% | |||||
Tenaris Investments Ltd. | Ireland | Holding company | 100% | 100% | 100% | |||||
Tenaris Qingdao Steel Pipes Ltd. (a) | China | Manufacturing of steel pipes and connections | 100% | 100% | — | |||||
Tenaris Supply Chain Services S.A. (b) | Argentina | Data administration services | 98% | — | — | |||||
Tenaris West Africa Ltd. | United Kingdom | Finishing of steel pipes | 100% | 100% | 100% | |||||
Texas Pipe Threaders Co. | U.S.A. | Finishing and marketing of steel pipes | 100% | 100% | 100% | |||||
Tubman Holdings (Gibraltar) LLP | Gibraltar | Holding company | 100% | 100% | 100% | |||||
Tubman International Ltd. | Gibraltar | Holding company | 100% | 100% | 100% | |||||
Tubos de Acero de México S.A. | Mexico | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
Tubos de Acero de Venezuela S.A. | Venezuela | Manufacturing of seamless steel pipes | 70% | 70% | 70% | |||||
Tubos del Caribe Ltda. (b) (l) | Colombia | Manufacturing of welded steel pipes | 100% | — | — |
(a) | Incorporated or acquired during 2005. |
(b) | Incorporated or acquired during 2006. |
(c) | Tenaris holds 99% of the voting shares of Confab Industrial S.A. and has, directly or indirectly, the majority of voting rights in all of its subsidiaries. |
(d) | Included in December 2004 as “Invertub S.A. and subsidiaries”. |
(e) | Included in December 2004 as “Insirger S.A. and subsidiaries”. |
(f) | Included in December 2004 as “Tamsider S.A. de C.V. and subsidiaries”. |
(g) | Merged during 2005. |
(h) | Included in December 2004 as “Dalmine Holding B.V. and subsidiaries”. |
(i) | Merged during 2006. |
(j) | Tenaris sold 75% of Dalmine Energie S.p.A. during 2006. |
(k) | Tenaris sold 50% of Lomond Holdings B.V. during 2006 to a subsidiary of Ternium. |
(l) | Subsidiary of Maverick Tube Corporation. |
(m) | Sold during 2006. |