144 0002069917 XXXXXXXX LIVE 0000891478 Banco Santander, S.A. 001-12518 Ciudad Grupo Santander Boadilla del Monte Madrid U3 28660 34-91-276-92-90 David Hazell Chief Compliance Officer American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each Fidelity Brokerage Services LLC

PO Box 28019 Albuquerque NM 87125-8019

3455 39283.35 14689319502 03/13/2026 NYSE American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each Fidelity Brokerage Services LLC

PO Box 28019 Albuquerque NM 87125-8019

3994 45411.78 14689319502 03/13/2026 NYSE American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each Fidelity Brokerage Services LLC

PO Box 28019 Albuquerque NM 87125-8019

5089 57861.93 14689319502 03/13/2026 NYSE American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each 02/27/2025 Equity compensation Issuer N 3455 02/27/2025 Compensation American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each 02/27/2025 Equity compensation Issuer N 3994 02/27/2025 Compensation American Depositary Shares, each representing the right to receive one Share of Capital Stock of Banco Santander, S.A., par value euro 0.50 each 02/27/2025 Equity compensation Issuer N 5089 02/27/2025 Compensation Y 03/13/2026 /s/ David Hazell