EX-8.1 15 ex81_2.htm EXHIBIT 8.1

Exhibit 8.1

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, 2022, 2021 and 2020.

Company | Country of Incorporation | Main activity | Percentage of ownership at December 31, (*)
2022 | 2021 | 2020
ALGOMA TUBES INC. | Canada | Manufacturing of welded and 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 | USA | Manufacture and marketing of premium connections | 100% | 100% | 100%
IPSCO TUBULARS INC. and subsidiaries | USA | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
MAVERICK TUBE CORPORATION and subsidiaries | USA | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
P.T. SEAMLESS PIPE INDONESIA JAYA | Indonesia | Manufacturing of seamless steel products | 89% | 89% | 89%
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% | 48%
SIAT SOCIEDAD ANONIMA | Argentina | Manufacturing of welded steel pipes | 100% | 100% | 100%
SIDERCA SOCIEDAD ANONIMA INDUSTRIAL Y COMERCIAL and subsidiaries (a) | 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 welded and 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) (b) | Uruguay | Holding company, marketing and distribution of steel products | 100% | 100% | 100%
TENARIS INVESTMENTS (NL) B.V. and subsidiaries | Netherlands | Holding company | 100% | 100% | 100%
TENARIS INVESTMENTS S.àr.l. | Luxembourg | Holding company | 100% | 100% | 100%
TENARIS QINGDAO STEEL PIPES LTD. | China | Processing of premium joints, couplings and automotive components | 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 holds 51% of NKKTubes.
(b) Tenaris holds 98,4% of Tenaris Supply Chain S.A., 40% of Tubular Technical Services Ltd. and Pipe Coaters Nigeria Ltd., 49% of Amaja Tubular Services Limited, 60% of Tenaris Baogang Baotou Steel Pipes Ltd. and until 2021 held 49% of Tubular Services Angola Lda.