Tenaris Share Buyback Program Weekly Report

This report details Tenaris S.A.’s share repurchases for the week of December 15-19, 2025, under the second tranche of its USD1.2 billion Share Buyback Program. During this period, the company purchased 5,336,993 ordinary shares for a total consideration of €89,794,646 (USD105,511,681). As of December 19, 2025, Tenaris held 56,599,414 treasury shares, representing 5.28% of its total issued share capital. The company intends to cancel these treasury shares in due course. Further details are available on Tenaris’s corporate website. The filing also includes forward-looking statements regarding potential risks, such as fluctuations in oil and gas prices, which could impact future results.