Report of Foreign Issuer (6-k)

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 6-K

Report of Foreign Private Issuer
Pursuant to Rule 13a-16 or 15d-16 of the

Securities Exchange Act of 1934

For the month of March, 2018

Commission File Number 1565025

AMBEV S.A.

(Exact name of registrant as specified in its charter)

AMBEV S.A.

(Translation of Registrant's name into English)

Rua Dr. Renato Paes de Barros, 1017 - 3rd Floor
04530-000 São Paulo, SP
Federative Republic of Brazil

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover Form 20-F or Form 40-F.

Form 20-F ___X___ Form 40-F _______

Indicate by check mark whether the registrant by furnishing the information contained in this Form 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____

AMBEV S.A.

CNPJ [National Register of Legal Entities] n° 07.526.557/0001-00
NIRE [Corporate Registration Identification Number] 35.300.368.941

MATERIAL FACT NOTICE

Ambev S.A. (“ Company ”), in compliance with the Brazilian Securities Commission (“ CVM ”) Instruction nº 358/2002, as amended, informs its shareholders and the public that in its 2017 annual earnings report no guidance of COGS (cost of goods sold) per hectoliter was released for 2018.

São Paulo, March 1 ^st , 2018.

Ambev S.A.

Ricardo Rittes de Oliveira Silva

Chief Financial and 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, thereunto duly authorized.

Date: March 1, 2018