SEC Form 6-K filed by Banco Santander Brasil SA

BANCO SANTANDER (BRASIL) S.A.

Publicly-Held Company with Authorized Capital

CNPJ/MF 90.400.888/0001-42 - NIRE 35.300.332.067

CALL NOTICE - EXTRAORDINARY GENERAL MEETING - Shareholders are hereby invited to attend the Extraordinary General Meeting ("EGM") to be held on November 28, 2025, at 3:00 p.m., at Banco Santander (Brasil) S.A. (“Santander Brasil” or “Company”)headquarters, located at Avenida Presidente Juscelino Kubitschek nº 2041 – mezzanine, Vila Nova Conceição, São Paulo/SP, to resolve on the following Agenda

(a)        To ratify the hiring of PricewaterhouseCoopers Auditores Independentes Ltda., as a specialized company responsible for preparing the appraisal report on the portion of the net equity of Return Capital Gestão de Ativos e Participações S.A. to be transferred to the Company (“Appraisal Report” and “Return” respectively);

(b)        To approve the Appraisal Report;

(c)        To approve the Private Instrument of Protocol and Justification of the Partial Spin-Off of Return with the transfer of the Spun-Off Portion to the Company, entered into on October 29, 2025 (“Protocol and Justification of the Partial Spin-off of Return”);

(d)        To Approve the incorporation of the spun-off portion of Return by the Company, pursuant to the Protocol and Justification of the Partial Spin-off of Return (“Merger”), in accordance with art. 227 of Law No. 6,404/76, as amended; and

(e)        If the previous matters are approved, authorize and ratify all the acts of the Company's managers necessary for the effectiveness of the resolutions proposed and approved by the Company's shareholders.

Observations for participation and Voting during the Meeting

Participation in the Meeting: Shareholders, their legal representatives or attorneys-in-fact may participate in the Meeting in any of the following ways:

In person - The shareholders or their legal representatives shall present themselves for the EGM with the appropriate identity documents. In the event of representation of a shareholder by an attorney-in-fact, shareholders shall provide the Company with a power of attorney granted according to the applicable law, to be delivered at the Company's Headquarters, at least seventy-two (72) hours before the EGM is held;

Remote Voting Ballot: the Company implemented the remote voting system pursuant to CVM Resolution 81/22, as amended, enabling our Shareholders to send remote voting ballots directly to the Company, to the bookkeeper or through their respective custodian agents, in accordance with the procedures described in the General Meeting Participation Manual.

As provided for in Article 5, § 4, of CVM Resolution No. 81/22, with the amendments introduced by CVM Resolutions No. 59/21 and 204/24, the Company understands that holding the EGM in person allows for a closer environment between shareholders and the attending Company's management, facilitating the clarification of doubts and the discussion of relevant matters, enabling a closer environment to deliberations and decision-making. In addition, it ensures greater security in the transmission of information, avoiding risks associated with technical or cyber failures.

In this sense, the Company recommends and encourages the participation of its shareholders in its Meetings, using the various participation channels made available, whether through the use of remote voting instruments, through the available electronic means or even by sending written votes to the Company or granting standardized proxies with voting instructions, in accordance with the instructions made available in the Management Proposal for the Extraordinary General Meeting of November 28, 2025.

General Instructions

1. As provided in CVM Resolution No. 70/22, the minimum percentage of participation in the voting capital required for the application of the cumulative voting process (processo de voto múltiplo) for the election of the members of the Board of Directors is of 5%;

2. As provided in § 2 of article 161 of Law No. 6,404/76 and art. 4 of CVM Resolution No. 70/22, the installation of a Fiscal Council by the General Meeting shall occur at the request of shareholders representing at least 2% (two percent) of the common shares, or 1% (one per cent) of preferred shares; and

3. The documents related to the matters to be examined and resolved at the EGM are available to shareholders (i) at the Company's headquarters, at Avenida Presidente Juscelino Kubitschek, nº 2041, Wtorre JK, 9th floor - Corporate Legal Department, where they can be consulted on business days, from 10:00 a.m. until 4:00 p.m., and on its investor relations website (www.ri.santander.com.br – at Corporate Governance >> Minutes of the Meeting); (ii) on the website of the CMV – Comissão de Valores Mobiliários (www.cvm.gov.br) and (iii) on the website of the stock exchange B3 S.A. - Brasil, Bolsa, Balcão (http://www.b3.com.br).

São Paulo, October 29, 2025

Deborah Stern Vieitas

Chairman of the Board of Directors