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6-K

Gerdau S.A. (GGB)

6-K 2024-11-05 For: 2024-11-05
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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

SECURITIES EXCHANGE ACT OF 1934

Dated November 5, 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, November 4, 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: November 5, 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), in addition to the Notice to the Market released on September 20, 2024, informs its shareholders and the market in general that, on November, 1^st^, 2024, after fulfillment the precedent conditions, the acquisition of assets from Dales Recycling Partnership, a company engaged in the operation, processing, and recycling of ferrous and non-ferrous scrap, was completed by Gerdau Ameristeel US Inc., subsidiary of Gerdau North America.

São Paulo, November 4, 2024.

Rafael Dorneles Japur

Executive Vice-President and

Investor Relations Officer