Banco Santander, S.A. Share Buyback Program Update

This report details the transactions made by Banco Santander, S.A. under its share buyback program between September 17 and September 23, 2026. The total cash amount spent on repurchasing shares during this period was €696,824,000, which represents approximately 38.2% of the program's maximum investment. As a result of these purchases, the bank has repurchased about 18.3% of its outstanding shares as of 2021. The report includes a detailed breakdown of each transaction, including the date, security, venue, number of shares, and average price. The filing was made on September 24, 2026, and signed by Pedro de Mingo Kaminouchi, Head of Corporate Compliance.