Form 6-K Filing

This filing is a report of foreign private issuer pursuant to rule 13a-16 or 15d-16 under the Securities Exchange Act of 1934. It is filed for the month of April 2026 by BANCO SANTANDER (BRASIL) S.A. The company is registered in the Federative Republic of Brazil and its principal executive office is located at Avenida Presidente Juscelino Kubitschek, 2041 and 2235, Bloco A – Vila Olimpia, São Paulo, SP 04543-011. The registrant files its annual reports under Form 20-F. The filing indicates that the registrant is not submitting the Form 6-K in paper and is not furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934. The report is signed by Reginaldo Antonio Ribeiro, Officer without specific designation, and Carlos Ignacio Muñiz Gonzalez Blanch, Vice - President Executive Officer, on April 29, 2026.