桑坦德巴西银行宣布派发股息

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 October, 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

[Free English Translation]

BANCO SANTANDER (BRASIL) S.A.

Public-held Company with Authorized Capital

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

Company Registry No. 35.300.332.067

NOTICE TO SHAREHOLDERS

Declaration and payment of Interest on Equity

São Paulo, October 09^th, 2026 - We hereby inform the Shareholders and the general market that the Board of Directors of Banco Santander (Brasil) S.A. (“Company”), at the meeting held on the present date, approved the Board of Executive Officers’ proposal, ad referendum of the Ordinary General Meeting of the Company’s shareholders to be held on 2027, for the distribution of Interest on Company’s Equity, pursuant to Articles 17, item XVIII, and 37, second paragraph of the Company's Bylaws in the gross amount of R$ 1,500,000,000.00 (one billion five hundred million Brazilian reais), which, after the deduction of the amount related to the Income Tax Withheld at Source (“IRRF”), pursuant to the laws in force, result the net amount corresponding to R$ 1,237,500,000.00 (one billion two hundred thirty-seven million five hundred thousand Brazilian reais), except for immune and/or exempt shareholders:

(*) One (1) Unit is comprised of 1 (one) Common Share and 1 (one) Preferred Share

The shareholders entitled for the Interest on Company’s Equity approved will be the ones registered in the Company’s books at the end of October 20^th, 2026 (including). Therefore, as of October 21^st, 2026 (including) the Company’s shares shall be traded “Ex-Interest on Equity”.

The amount of these and Interest on Company’s Equity approved will be paid as of November 09^th, 2026 and fully considered within the amount of mandatory dividends to be distributed by the Company for the year 2026, without any compensation as monetary indexation.

[Free English Translation]

Regarding holders of the Company’s American Depositary Receipts (ADRs) traded in the New York Stock Exchange – NYSE, the payment will be carried out by The Bank of New York Mellon, depositary bank of the ADRs, pursuant to regulations applied to the local market.

Information regarding the US Record Date, payment date, or any further information for specific rules and conditions applied to the ADRs may be obtained at www.adrbnymellon.com.

Carlos Ignacio Muñiz Gonzalez Blanch

Investor Relations Officer

BANCO SANTANDER (BRASIL) S.A.

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: October 9, 2026