6-K

UNITED STATESSECURITIES 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 March, 2023

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 2235Bloco A – Vila OlimpiaSão Paulo, SP 04543-011Federative 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 with Authorized Capital

CNPJ/ME: 90.400.888/0001-42

NIRE: 35.300.332.067

NOTICE TO THE MARKET

BANCO SANTANDER (BRASIL) S.A. (“Santander”), in addition to the information disclosed through the Notice to the Market released on November 14^th^, 2022, hereby informs its shareholders and the market in general that, on this date, considering the fulfillment of the applicable conditions precedent, its wholly-owned affiliate Santander Corretora de Seguros, Investimentos e Serviços S.A. (“Santander Corretora”) formalized the closing of the investment transaction in Biomas – Serviços Ambientais, Restauração e Carbono S.A. (“Biomas”), becoming a shareholder of Biomas together with Itaú Unibanco, Marfrig, Rabobank, Suzano and Vale (“Transaction”).

With the closing of the Transaction, Santander Corretora becomes shareholder of 16.66% of the shares of Biomas.

São Paulo, March 21, 2023.

Gustavo Alejo Viviani

Investor Relations Officer

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: March 21, 2023