EX-8.1 5 exh_81.htm EXHIBIT 8.1

Exhibit 8.1

Tenaris – List of subsidiaries of Tenaris S.A.

Principal subsidiaries

We conduct all our operations through subsidiaries. The following table shows the principal subsidiaries of the Company and its direct and indirect ownership in each subsidiary as of December 31, 2018, 2017 and 2016.

Company |  | Country of Incorporation |  | Main activity |  | Percentage of ownership at December 31, (*)
|  |  |  |  |  | 2018 |  | 2017 |  | 2016
ALGOMA TUBES INC. |  | Canada |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
CONFAB INDUSTRIAL S.A. and subsidiaries |  | Brazil |  | Manufacturing of welded steel pipes and capital goods |  | 100% |  | 100% |  | 100%
KAZAKHSTAN PIPE THREADERS LIMITED LIABILITY PARTNERSHIP |  | Kazakhstan |  | Threading of premium products |  | 100% |  | 100% |  | 100%
HYDRIL COMPANY and subsidiaries (except detailed) (a) |  | USA |  | Manufacture and marketing of premium connections |  | 100% |  | 100% |  | 100%
DALMINE S.p.A. |  | Italy |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
MAVERICK TUBE CORPORATION and subsidiaries |  | USA |  | Manufacturing of welded steel pipes |  | 100% |  | 100% |  | 100%
S.C. SILCOTUB S.A. |  | Romania |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
NKKTUBES |  | Japan |  | Manufacturing of seamless steel pipes |  | 51% |  | 51% |  | 51%
SIAT SOCIEDAD ANONIMA |  | Argentina |  | Manufacturing of welded and seamless steel pipes |  | 100% |  | 100% |  | 100%
PRUDENTIAL STEEL LTD. |  | Canada |  | Manufacturing of welded steel pipes |  | 100% |  | 100% |  | 100%
SIDERCA SOCIEDAD ANONIMA INDUSTRIAL Y COMERCIAL and subsidiaries |  | Argentina |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
P.T. SEAMLESS PIPE INDONESIA JAYA |  | Indonesia |  | Manufacturing of seamless steel products |  | 89% |  | 89% |  | 77%
TUBOS DE ACERO DE MEXICO, S.A. |  | Mexico |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
TENARIS GLOBAL SERVICES (U.S.A.) CORPORATION |  | USA |  | Marketing of steel products |  | 100% |  | 100% |  | 100%
TENARIS BAY CITY, INC. |  | USA |  | Manufacturing of seamless steel pipes |  | 100% |  | 100% |  | 100%
TENARIS GLOBAL SERVICES (UK) LTD |  | United Kingdom |  | Holding company and marketing of steel products |  | 100% |  | 100% |  | 100%
TENARIS INVESTMENTS SWITZERLAND AG and subsidiaries |  | Switzerland |  | Holding company |  | 100% |  | 100% |  | 100%
TENARIS FINANCIAL SERVICES S.A. |  | Uruguay |  | Financial company |  | 100% |  | 100% |  | 100%
TENARIS GLOBAL SERVICES (CANADA) INC. |  | Canada |  | Marketing of steel products |  | 100% |  | 100% |  | 100%
TENARIS INVESTMENTS S.àr.l. |  | Luxembourg |  | Holding company |  | 100% |  | 100% |  | 100%
TENARIS CONNECTIONS BV |  | Netherlands |  | Development, management and licensing of intellectual property |  | 100% |  | 100% |  | 100%
TENARIS GLOBAL SERVICES S.A. and subsidiaries (except detailed) (b) |  | Uruguay |  | Holding company and marketing of steel products |  | 100% |  | 100% |  | 100%
TALTA - TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. |  | Portugal |  | Holding Company |  | 100% |  | 100% |  | 100%

(*) All percentages rounded.

(a) Tenaris Investments S.a.r.l. holds 100% of Hydril's subsidiaries shares except for Technical Drilling & Production Services Nigeria. Ltd where it holds 80%.

(b) Tenaris holds 97,5% of Tenaris Supply Chain S.A, 60% of Gepnaris S.A. and 40% of Tubular Technical Services and Pipe Coaters, and 49% of Amaja Tubular Services Limited and Tubular Services Angola Ltd.

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