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, 20 2 3, 20 2 2 and 20 2 1.

Company | Country of Incorporation | Main activity | Percentage of ownership at December 31, (*)
2023 | 2022 | 2021
ALGOMA TUBES INC. | Canada | Manufacturing of welded and seamless steel pipes | 100% | 100% | 100%
BREDERO SHAW INTERNATIONAL B.V. and subsidiaries | Netherlands | Holding company and supplier of pipe coating services | 100% | NA | NA
CONFAB INDUSTRIAL S.A. and subsidiaries | Brazil | Manufacturing of welded steel pipes | 100% | 100% | 100%
DALMINE S.p.A. and subsidiaries | Italy | Manufacturing of seamless steel pipes | 100% | 100% | 100%
EXIROS B.V. and subsidiaries (a) | Netherlands | Procurement and trading services | 50% | 50% | 50%
HYDRIL COMPANY and subsidiaries | USA | Manufacture and marketing of premium connections | 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. and subsidiaries (b) | 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 (c) | 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 | 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 GLOBAL SERVICES and INVESTMENTS S.àr.l. and subsidiaries | 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. and subsidiaries | Mexico | Manufacturing of seamless steel pipes | 100% | 100% | 100%

(*) All percentages rounded.
Tenaris holds 40% of Tubular Technical Services Ltd. and Pipe Coaters Nigeria Ltd., 49% of Tubulars Finishing Nigeria Limited, 49% of Amaja Tubular Services Limited, 60% of Tenaris Baogang Baotou Steel Pipes Ltd. Until 2022 held 98.4% of Tenaris Supply Chain S.A. and, until 2021 held 49% of Tubular Services Angola Lda. after which years it started holding 100% of each of both companies.
(a) Tenaris holds 50% of the voting rights. The Company recognizes the assets, liabilities, revenue and expenses in relation to its interest in the joint operation.
(b) Saudi Steel Pipe Co. is a public company listed in the Saudi Arabian Stock Exchange (Tad ā wul), Tenaris holds 47.79% and has the right to nominate the majority of the votes of the board of directors, therefore Tenaris has control over SSPC. Since May, 2023, Saudi Steel Pipe Co. holds 57.3% of Global Pipe Company, therefore Tenaris has control over GPC.
(c) Until its liquidation in April 2023 Siderca held 51% of NKKTubes.