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.

Corporate Taxpayer’s ID (CNPJ/MF) No. 01.545.826/0001-07

Corporate Registry (NIRE) 35.300.147.952

Publicly-Held Company

NOTICE TO MARKET

GAFISA S.A. (BOVESPA: GFSA3; NYSE, GFA) (“Gafisa” or “Company”) hereby discloses to the market the communication received on this date from its shareholder River and Mercantile Asset Management LLP (“Investor”), pursuant to Article 12 of CVM Instruction 358/02, as follows:

1. The Investor acquired 100,000 shares issued by Gafisa (trade date 6^th March 2018, Value Date 9^th March 2018) and became the holder of 4,517,968 common shares issued by Gafisa, reaching relevant participation of 10.09% of the total capital stock of the Company;

2. The Investor declares that its objective for the participation abovementioned is strictly of investment and the participation does not have the purpose of changing the controlling group or the administrative structure of the Company;

3. In addition, the Investor declares that he does not hold any convertible debentures issued by the Company or any other securities convertible in shares or that grant rights to subscribe or acquire shares issued by the Company; and

4. Finally, the Investor declares that has not entered into any contract or agreement governing the exercise of voting rights or the purchase and sale of the securities issued by the Company.

São Paulo, March 14, 2018.

GAFISA S.A.

Carlos Eduardo Moraes Calheiros

Financial and Investor Relations Officer