TSTenaris S.A.

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Its agent for U.S. federal securities law purposes is Tenaris Global Services (U.S.A.) Corporation ("TEUS"), located at 2200 West Loop South, Suite 400, Houston, TX 77027. Tenaris began in 1948 with the formation of Siderca, then Argentina’s sole producer of seamless steel pipe products, founded by San Faustin’s predecessor. We grew organically in Argentina and then, in the early 1990s, began to evolve beyond this initial base into a global business through a series of strategic acquisitions and investments.

In the company’s own words · 20-F filed Mar 31, 2026 · SEC EDGAR