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 March 5 and March 11, 2026. The total cash amount spent on repurchasing shares during this period was €1,944,246,623, which represents approximately 38.7% of the program's maximum investment amount. As a result of these purchases, the bank has repurchased approximately 16.4% of its outstanding shares as of 2021. The report includes a table with detailed transaction information, including the date, security, number of shares purchased, and the weighted average price on various trading venues. This update is in compliance with EU regulations on market abuse and is part of the bank's ongoing communication regarding its share buyback activities.