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, 2018

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 with Authorized Capital

CNPJ/MF 90.400.888/0001-42

NIRE 35.3.00332067

NOTICE TO THE MARKET

BANCO SANTANDER (BRASIL) S.A. (B3: SANB11) (“Santander Brasil”) informs to the shareholders and the market, in continuation to the Material Fact released on December 20, 2017, that on this date Santander Auto S.A. was incorporated, being 50% (fifty percent) held by SANCAP Investimentos e Participações S.A., a company controlled by Santander Brasil, and 50% (fifty percent) by HDI Seguros S.A. ("HDI").

Santander Auto will underwrite,, offer and commercialize auto insurance through a 100% digital platform, setting new standards for services in the insurance market and providing customers with a simpler way of hiring and using auto insurance.

The effective commencement of Santander Auto's operations depends on the obtaining of the respective operating permit from the Superintendency of Private Insurance (SUSEP).

São Paulo, October 9, 2018.

Angel Santodomingo

Investors 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: October 9, 2018

Banco Santander (Brasil) S.A.
By:	/S/ Amancio Acurcio Gouveia
	Amancio Acurcio Gouveia Officer Without Specific Designation

By:	/S/ Angel Santodomingo Martell
	Angel Santodomingo Martell Vice - President Executive Officer