144 0001706941 XXXXXXXX LIVE 0000891478 BANCO SANTANDER SA 001-12518 Ciudad Grupo Santander 28660 Boadilla del Monte Madrid U3 28660 34-91-259-6520 Mahesh Chatta Aditya Chief Risk 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 Timothy J Hanson

JP Morgan Securities 925 Westchester Avenue, Suite 302 West Harrison NY 10604

10665 50658.75 16184146059 11/08/2024 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 11/06/2024 Open market purchase Open market purchase N 10665 11/06/2024 Cash Y 11/11/2024 /s/ Mahesh Chatta Aditya