Banco Santander, S.A. Share Buyback Program Update

Banco Santander, S.A. has reported on its share buyback program, detailing transactions conducted between October 8 and October 14, 2026. The total cash amount spent on repurchased shares during this period was €1,248,734,451, which constitutes approximately 68.4% of the program's maximum investment amount. As a result of these purchases, the bank has repurchased approximately 18.5% of its outstanding shares as of 2021. The report includes a table listing individual transactions by date, security, trading venue, number of shares, and weighted average price. Detailed information on each transaction is provided in an attached annex. The filing was made on October 15, 2026, and signed by Pedro de Mingo Kaminouchi, Head of Corporate Compliance.