EX-8.1 11 ex81_4.htm EXHIBITS 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, 20 20, 201 9 and 201 8.

Company | Country of Incorporation | Main activity | Percentage of ownership at December 31, (*)
2020 | 2019 | 2018
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%
DALMINE S.p.A. | Italy | Manufacturing of seamless steel pipes | 100% | 100% | 100%
HYDRIL COMPANY and subsidiaries (except detailed) (a) | USA | Manufacture and marketing of premium connections | 100% | 100% | 100%
IPSCO TUBULARS INC. and subsidiaries | USA | Manufacturing of welded and seamless steel pipes | 100% | NA | NA
KAZAKHSTAN PIPE THREADERS LIMITED LIABILITY PARTNERSHIP | Kazakhstan | Threading of premium products | 100% | 100% | 100%
MAVERICK TUBE CORPORATION and subsidiaries | USA | Manufacturing of welded steel pipes | 100% | 100% | 100%
NKKTUBES | Japan | Manufacturing of seamless steel pipes | 51% | 51% | 51%
P.T. SEAMLESS PIPE INDONESIA JAYA | Indonesia | Manufacturing of seamless steel products | 89% | 89% | 89%
PRUDENTIAL STEEL LTD. (b) | Canada | Manufacturing of welded steel pipes | 100% | 100% | 100%
S.C. SILCOTUB S.A. | Romania | Manufacturing of seamless steel pipes | 100% | 100% | 100%
SAUDI STEEL PIPE CO. | Saudi Arabia | Manufacturing of welded steel pipes | 48% | 48% | NA
SIAT SOCIEDAD ANONIMA | Argentina | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
SIDERCA SOCIEDAD ANONIMA INDUSTRIAL Y COMERCIAL and subsidiaries | Argentina | Manufacturing of seamless steel pipes | 100% | 100% | 100%
TALTA - TRADING E MARKETING SOCIEDADE UNIPESSOAL LDA. | Portugal | Holding Company | 100% | 100% | 100%
TENARIS BAY CITY, INC. | USA | Manufacturing of seamless steel pipes | 100% | 100% | 100%
TENARIS CONNECTIONS BV | Netherlands | Development, management and licensing of intellectual property | 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 GLOBAL SERVICES (U.S.A.) CORPORATION | USA | Marketing of steel products | 100% | 100% | 100%
TENARIS GLOBAL SERVICES (UK) LTD | United Kingdom | Holding company and marketing of steel products | 100% | 100% | 100%
TENARIS GLOBAL SERVICES S.A. and subsidiaries (except detailed) (c) | Uruguay | Holding company and marketing of steel products | 100% | 100% | 100%
TENARIS INVESTMENTS (NL) B.V. and subsidiaries | Netherlands | Holding company | 100% | 100% | NA
TENARIS INVESTMENTS S.àr.l. | Luxembourg | Holding company | 100% | 100% | 100%
TENARIS TUBOCARIBE LTDA. | Colombia | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
TUBOS DE ACERO DE MEXICO, S.A. | Mexico | Manufacturing of seamless steel pipes | 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 held 80% for 2019 and 2018.

(b) Prudential Steel Ltd. has been closed down and the pipe manufacturing operations of seamless, welded and premium products in Canada will be consolidated at the facility of A lgoma Tubes Inc.

(c) Tenaris holds 97.5% of Tenaris Supply Chain S.A. and 40% of Tubular Technical Services Ltd. and Pipe Coaters Nigeria Ltd., 49% of Amaja Tubular Services Limited, 49% of Tubular Services Angola Lda and 60% of Tenaris Baogang Baotou Steel Pipes Ltd.