UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE
SECURITIES EXCHANGE ACT OF 1934
For the month of May, 2026
Commission File Number: 001-34476
BANCO SANTANDER (BRASIL) S.A.
(Exact name of registrant as specified in its charter)
Avenida Presidente Juscelino Kubitschek, 2041 and 2235
Bloco A – Vila Olimpia
São Paulo, SP 04543-011
Federative Republic of Brazil
(Address of principal executive office)
Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F: Form 20-F ___X___ Form 40-F _______
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1):
Yes _______ No ___X____
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7):
Yes _______ No ___X____
Indicate by check mark whether by furnishing the information contained in this Form, the Registrant is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934:
Yes _______ No ___X____
If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): N/A

BANCO SANTANDER (BRASIL) S.A.
Publicly-Held Company of 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 June 30, 2026, 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 of Esfera Fidelidade S.A (“Appraisal Report”
and “Esfera” respectively);
(b)
To approve the Appraisal Report;
(c)
To approve the Private Instrument of Protocol and Justification
of the Merger of Esfera, entered into on May 28, 2026 (“Protocol and Justification of the Merger of Esfera”);
(d)
To approve the merger of Esfera into the Company, under the
terms of the Protocol and Justification of the Merger of Esfera, pursuant to the article 227 of the Brazilian Law nº 6.404/76, as
amended, (“Merger”); and
(e)
If the previous matters are approved, authorize and ratify all
the acts of the Company's management 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 June 30, 2026.
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 CVM – 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, May 28, 2026
Deborah Stern Vieitas
Chairwoman of the Board of Directors.
___________________________________________________
SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, thereto duly authorized.
Date: May 28, 2026
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Banco Santander (Brasil) S.A. |
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By: |
/S/ Reginaldo Antonio Ribeiro
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Reginaldo Antonio Ribeiro Officer without specific designation
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By: |
/S/ Carlos Ignacio Muñiz Gonzalez Blanch
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Carlos Ignacio Muñiz Gonzalez Blanch Vice - President Executive Officer
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