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, 2016, 2015 and 2014.
Company | Main activity | Percentage of ownership | ||||||||
Country of | 2016 | 2015 | 2014 | |||||||
ALGOMA TUBES INC. | Canada | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
CONFAB INDUSTRIAL S.A. | Brazil | Manufacturing of welded steel pipes and capital goods | 100% | 100% | 100% | |||||
DALMINE S.p.A. | Italy | Manufacturing of seamless steel pipes | 100% | 99% | 99% | |||||
EXIROS B.V. | Netherlands | Procurement of raw materials and other products or services | 50% | 50% | 50% | |||||
HYDRIL COMPANY | USA | Manufacturing and marketing of premium connections | 100% | 100% | 100% | |||||
MAVERICK TUBE CORPORATION | USA | Manufacturing of welded steel pipes | 100% | 100% | 100% | |||||
METALMECANICA S.A. | Argentina | Manufacturing of sucker rods | 100% | 100% | 100% | |||||
NKKTUBES | Japan | Manufacturing of seamless steel pipes | 51% | 51% | 51% | |||||
PT SEAMLESS PIPE INDONESIA JAYA | Indonesia | Manufacturing of seamless steel products | 77% | 77% | 77% | |||||
PRUDENTIAL STEEL ULC | Canada | Manufacturing of welded steel pipes | 100% | 100% | 100% | |||||
S.C. SILCOTUB S.A. | Romania | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
SIAT SOCIEDAD ANONIMA | Argentina | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100% | |||||
SIDERCA S.A.I.C. | Argentina | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
TENARIS COILED TUBES LLC (and predecessors) | USA | Manufacturing of coiled tubing | 100% | 100% | 100% | |||||
TENARIS CONNECTIONS B.V. | Netherlands | Ownership and licensing of technology | 100% | 100% | 100% | |||||
TENARIS FINANCIAL SERVICES S.A. | Uruguay | Financial company | 100% | 100% | 100% | |||||
TENARIS GLOBAL SERVICES S.A. | Uruguay | Holding company and marketing of steel products | 100% | 100% | 100% | |||||
TUBOS DE ACERO DE MEXICO S.A. | Mexico | Manufacturing of seamless steel pipes | 100% | 100% | 100% | |||||
TENARIS TUBOCARIBE LTDA. | Colombia | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100% |