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 27, 2019

Commission File Number 1-14878

GERDAU S.A.

(Exact Name as Specified in its Charter)

N/A

(Translation of Registrant’s Name)

Av. Dra. Ruth Cardoso, 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 27, 2019

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 27, 2019

3

EX-99.1

Exhibit 99.1

GERDAU S.A.
Corporate Taxpayer ID (CNPJ/MF): 33.611.500/0001-19
Publicly Held Company

NOTICE TO THE MARKET

Gerdau S.A. (“Company” or “Gerdau”) hereby announces to its shareholders and the general market that, on November 26, 2019, the subsidiary Gerdau Aços Longos S.A. entered into a final agreement with Hierros Añón, S.A. and Gallega de Mallas, S.L. for the acquisition of 96.35% of the shares issued by Siderúrgica Latino-Americana S.A. (“SILAT”), a company located in Caucaia, in the metropolitan area of Fortaleza, State of Ceará, for economic value of US$ 110.8 million, subject to the typical adjustments to the acquisition price.

The consummation of the transaction is subject to approval by Brazil’s antitrust agency CADE (Conselho Administrativo de Defesa Econômica) and to the fulfillment of conditions precedent typical to transactions of this type.

The Company will maintain its shareholders and the market informed of any developments regarding the aforementioned transaction, as applicable, in accordance with the law and with CVM regulations.

SILAT

SILAT has installed production capacity of 600,000 tonnes of rolled steel goods. The acquisition is part of Gerdau’s strategy to improve service to its clients in the Brazilian market.

São Paulo, November 27, 2019

Harley Lorentz Scardoelli
Executive Vice President
Investor Relations Officer