Banco Santander (Brasil) S.A. Files Form 6-K Report

This filing is a Form 6-K report for Banco Santander (Brasil) S.A. for the month of October 2026. It serves as a report of a foreign private issuer pursuant to Rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934. The report includes standard declarations regarding the filing of annual reports on Form 20-F and submission of the Form 6-K in paper format. Signatures from company officers Reginaldo Antonio Ribeiro and Carlos Ignacio Muñiz Gonzalez Blanch are included, dated October 28, 2026.