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6-K

Gerdau S.A. (GGB)

6-K 2024-09-18 For: 2024-09-18
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Added on April 11, 2026

U.S. SECURITIES AND EXCHANGE COMMISSION

Washington**,D.C. 20549**

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

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

SECURITIESEXCHANGE ACT OF 1934

Dated September 18, 2024

Commission File Number 1-14878

GERDAU S.A.

(Translation of Registrant’s Name into English)

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    ¨

Exhibit Index

Exhibit Description of Exhibit
99.1 Notice to the Market, September 18,<br>2024
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SIGNATURES

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:  September 18, 2024

GERDAU S.A.
By: /s/ Rafael Dorneles Japur
Name: Rafael Dorneles Japur
Title: Executive Vice President Investor Relations Director

Exhibit 99.1

GERDAU S.A.

Corporate Tax ID (CNPJ/MF): 33.611.500/0001-19

Registry (NIRE): 35300520696

NOTICE TO THE MARKET

Gerdau S.A. (B3: GGBR / NYSE: GGB) announces to its shareholders and the general market that, on September 17, 2024, Gerdau Ameristeel US Inc., subsidiary of Gerdau in North America, signed an agreement to acquire the assets of Dales Recycling Partnership, a company engaged in the operation, processing, and recycling of ferrous scrap. The investment of approximately US$ 60 million includes land, inventory, and fixed assets associated with Dales Recycling’s operations in Tennessee, Kentucky, and Missouri, in the United States. This acquisition aims to increase capture of captive ferrous scrap by Gerdau through proprietary channels, supplying raw material to its operations at a competitive cost.

The closing of the transaction is subject to the satisfaction of customary conditions precedent for operations of this nature.

Gerdau clarifies that this acquisition is aligned with its strategy of growth and competitiveness of operations, through assets with greater potential for long-term value generation and expansion of its presence in more profitable markets for its business.

São Paulo, September 18, 2024.

Rafael Dorneles Japur

Executive Vice-President and

Investor Relations Officer