Banco Santander, S.A. Share Buyback Program Update

Banco Santander, S.A. reported on its ongoing share buyback program, detailing transactions from June 11 to June 17, 2026. The total cash amount spent on repurchased shares during this period was €3,376,585,780, representing approximately 67.1% of the program's maximum investment. This brings the total repurchase of outstanding shares to approximately 17.2% as of 2021. The report includes a table of transactions, specifying dates, security, transaction type (purchase), trading venue, number of shares, and weighted average price. A total of 10,708,137 shares were purchased within the reported week. Further detailed transaction information is available in Annex I, linked in the filing.