6-K

FORM 6-K

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 UNDER THE

SECURITIES EXCHANGE ACT OF 1934

Dated November 5, 2018

Commission File Number 1-14878

GERDAU S.A.

(Exact Name as Specified in its Charter)

N/A

(Translation of Registrant’s Name)

Av. das Nações Unidas, 8,501 – 8° andar

São Paulo, São Paulo - Brazil CEP 05425-070

(Address of principal executive offices)

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  o

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): o

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): o

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  o          No x

If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b):  Not applicable.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused the Report to be signed on its behalf by the undersigned, thereunto duly authorized.

Date:  November 5, 2018

GERDAU S.A.
By:	/s/ Harley Lorentz Scardoelli
Name:	Harley Lorentz Scardoelli
Title:	Investor Relations Director

2

EXHIBIT INDEX

Exhibit	Description of Exhibit
99.1	Notice to the Market, November 5, 2018

3

EX-99.1

Exhibit 99.1

GERDAU S.A. CNPJ/MF n.º 33.611.500/0001-19 NOTICE TO THE MARKET Gerdau S.A. is announcing the completion of the sale to Commercial Metals Company (CMC) of four U.S. rebar mills and rebar fabrication locations. The sale includes the steel mills in Jacksonville, FL, Knoxville, TN, Rancho Cucamonga, CA, and Sayreville, NJ, as well as all of Gerdau’s U.S. rebar fabrication facilities. The transaction was originally announced on January 2, 2018, for US$ 600 million, as well as an approximately US$100 million estimated working capital adjustment. The purchase price is subject to a further customary purchase price adjustment as described in the Purchase Agreement. The cash received will be used to reduce financial leverage. Gerdau maintains a strong presence in North America. With 13 steel mills located throughout the U.S. and Canada, Gerdau continues to be a leading producer of structural steel, merchant bar, and special bar quality products, as well as rebar. According to Gustavo Werneck, CEO of Gerdau, “the completion of this transaction represents an important milestone in our strategy to reduce financial leverage and to focus on better return opportunities. We will accelerate growth in attractive segments in North America, one of our core markets, and will continue to serve and create value for customers in the construction, industrial equipment, transportation and energy markets”. São Paulo, November 05, 2018. Harley Lorentz Scardoelli Executive Vice-President Investor Relations Officer