Repurchased own ordinary shares reached 5% of Tenaris’s voting rights; Tenaris’s controlling shareholder files amendment to Schedule 13D

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.