LUXEMBOURG, Dec. 17, 2025 (GLOBE NEWSWIRE) -- Pursuant to applicable Luxembourg Transparency Law requirements, Tenaris S.A. (NYSE and Mexico: TS and EXM Italy: TEN) ("Tenaris" or the "Company") announces that on December 17, 2025, the proportion of own ordinary shares acquired under its share buyback program and currently held in treasury has reached 5.07% of Tenaris's voting rights. Ordinary shares repurchased under such program are being held in treasury (with their voting rights suspended) and will be cancelled in due course. Reporting of share buyback transactions in accordance with Market Abuse Regulation is available at: https://ir.tenaris.com/share-buyback-program.

In addition, the Company informs the market that on December 17, 2025, its indirect controlling shareholder San Faustin S.A. and its direct controlling shareholder Techint Holdings S.à r.l. (the "Reporting Persons") filed with the U.S. Securities and Exchange Commission (the "SEC") a new amendment to their beneficial ownership report on Schedule 13D, reporting that, further to the previously-reported September 17, 2025 San Faustin board of directors' authorization to Techint Holdings to sell up to such number of Tenaris ordinary shares that would not cause its ownership stake in Tenaris ...