Banco Santander, S.A. Share Buyback Program Update

Banco Santander, S.A. reported on its ongoing share buyback program, detailing transactions conducted between June 4 and June 10, 2026. The total cash amount spent on repurchasing shares during this period was €3,256,642,080, representing approximately 64.7% of the program's maximum investment amount. As a result of these purchases, the bank has repurchased about 17.1% of its outstanding shares as of 2021. The filing includes a detailed list of transactions, specifying the date, security, transaction type (purchase), trading venue, number of shares, and weighted average price. The report was filed on June 11, 2026, and signed by Pedro de Mingo Kaminouchi, Head of Corporate Compliance.