Banco Santander SA reported a record profit of EUR 3.4 billion for Q1 2025, a 19% increase from the previous year, with a CET1 capital ratio of 12.9%. Revenue grew by 5% in constant euros, driven by net interest income and strong fee growth, while the bank plans to distribute up to EUR 10 billion to shareholders through buybacks. However, challenges include currency depreciation, economic issues in Argentina, and increased loan loss provisions.