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

GAFISA S.A.

CNPJ/MF n° 01.545.826/0001-07

NIRE 35.300.147.952

Publicly-held Company

NOTICE TO THE MARKET

São Paulo, SP, Brazil, August 15, 2018 - GAFISA S.A. (BOVESPA: GFSA3) (“Gafisa” or “Company”), makes available to the market the following notice received:

“The Grupo GWI (“GWI”), of which GWI Asset Management S.A., a corporation registered in the CNPJ/MF under nº 01.941.968/0001-85, headquartered in the City and State of São Paulo at Av. Brigadeiro Faria Lima, nº 3900, 6º andar, conj. 602, is a part of, pursuant to CVM Instruction No. 358/2002, amended by CVM Instruction No. 449/07, hereby informs that now holds the total amount of 13,543,245 (thirteen million, five hundred and forty-three thousand, two hundred and forty-five) common shares, corresponding to 30.25% of the Company’s common shares.

In reviewing the previous shareholding position informed on the notice issued on July 20, 2018, GWI points out that this share acquisition has the purpose of investment and change part of the Company’s administrative Board, also it informs that (i) it does not have intention to acquire the Company’s controlling shareholder; (ii) it does not hold warrants nor debentures convertible into shares issued by the Company; and (iii) it has not executed any agreement or contract regulating the exercise of voting right or the purchase and sale of securities issued by the Company.

GWI aims to hold participation in the total amount of no more than 50% of the common shares issued by the Company.

There being no further matters to discuss, we remain at your disposal for any clarification”.

GAFISA S.A.

Carlos Calheiros

Chief Financial and Investor Relations Officer