Initial Statement of Beneficial Ownership

This filing is an initial statement of beneficial ownership for Banco Santander (Brasil) S.A. (BSBR). The reporting owner, Claudia Chaves Sampaio, holds a direct ownership of 24,215 shares of UNIT - SANB11, 259 Ordinary Shares - SANB3, and 260 Preferred Shares - SANB4. The signature date was March 20, 2026.