SEC Form 6-K filed by Banco Santander Brasil SA

BANCO SANTANDER (BRASIL) S.A.

Publicly-Held Company with Authorized Capital

Corporate Taxpayer´s Registry No. 90.400.888/0001-42

Company Registry No. 35.300.332.067

Minutes of the Board of Directors' Meeting

held on May 08, 2026

DATE, TIME AND PLACE: On 05.08.2026, at 5 p.m., by videoconference, the Board of Directors of Banco Santander (Brasil) S.A. ("Company" or "Santander") have met, with the attendance of all its members.

CALL NOTICE AND ATTENDANCE: The call was waived in view of the attendance of all members of the Board of Directors.

MEETING BOARD: Deborah Stern Vieitas, Chair of the Board. Bruno Carneiro, Secretary of the Board.

AGENDA: following up on the communication of the succession plan of Mr. Mario Roberto Opice Leão, current Chief Executive Officer of the Company, carried out by means of a Material Fact disclosed to the market on March 19, 2026, to resolve on the election of Mr. Gilson Finkelzstain to the position of Chief Executive Officer of the Company.

RESOLUTIONS: After the necessary clarifications, the members of the Board of Directors, unanimously, approved the election, for a complementary term of office, entering in force until the investiture of the elected people at the first Board of Directors’ Meeting being held after the 2027 Ordinary Shareholders’ Meeting, the following person, as a Chief Executive Officer, of Mr. Gilson Finkelzstain, Brazilian, married, engineer, bearer of identity card RG No. 7.055.797-0, registered with the CPF/MF under No. 012.032.457-18, with office at Avenida Presidente Juscelino Kubitschek, 2041 – CJ 281, Bloco A, Cond. W Torre JK, Vila Nova Conceição, CEP 04543-011, São Paulo/SP.

It remains recorded in the minute that:

(i) the election approved above was recommended by the Company´s Nomination and Governance Committee;

(ii) that the elected member declare that he is not forbidden by law to perform the activities proper to their office and fulfill all the conditions set forth in Resolution CMN 4.970/2021, presenting the respective representations and authorizations required by the mentioned Resolution; and

(iii) that the investiture of the elected member will be conditioned cumulatively to the verification of the following events: (a) authorization of his election by the Central Bank of Brazil; (b) termination of its relationship with B3 S.A. – Brasil, Bolsa, Balcão; and (c) effective step down of the Company's current Chief Executive Officer, Mr. Mario Roberto Opice Leão, according to the succession schedule disclosed to the market through the Material Fact on March 19, 2026.

ADJOURNMENT: There being no further matters to be resolved, the Meeting was finalized, and these minutes have been prepared and send to be electronically signed by the attendees. Board: Deborah Stern Vieitas - Chair of the Board. Bruno Carneiro - Secretary of the Board. Board Members: Ms. Deborah Stern Vieitas – President; Mr. Javier Maldonado Trinchant – Vice-President; and Messrs. Antonio Carlos Quintella; Cristiana Almeida Pipponzi, Cristina San Jose Brosa, Deborah Patricia Wright, Ede Ilson Viani, Mario Roberto Opice Leão, Nitin Prabhu, Pedro Augusto de Melo and Vanessa de Souza Lobato Barbosa. São Paulo, May 8, 2026.

I certify that this is a true transcript of the minutes recorded in the Minutes of the Board of Directors Meetings Book of the Company.

Bruno Carneiro

Secretary