UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-A

FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES

PURSUANT TO SECTION 12(b) or 12(g) OF THE

SECURITIES EXCHANGE ACT OF 1934

See Table of Additional Registrants below

Securities to be registered pursuant to Section 12(b) of the Act:

If this form relates to the registration of a class of securities pursuant to Section 12(b) of the Exchange Act and is effective pursuant to General Instruction A.(c), check the following box.    x

If this form relates to the registration of a class of securities pursuant to Section 12(g) of the Exchange Act and is effective pursuant to General Instruction A.(d), check the following box.    ¨

Securities Act registration statement file number to which this form relates: 333-284698 and 333-284698-01

Securities to be registered pursuant to Section 12(g) of the Act: None

TABLE OF ADDITIONAL REGISTRANTS

* Each additional registrant is a direct or indirect subsidiary of Gerdau S.A. The address, including zip code, and telephone number, including area code, of each registrant’s principal executive offices is Av. Dra. Ruth Cardoso, 8501, 8th floor, 05425-070, São Paulo, São Paulo, Federative Republic of Brazil.

Item 1. Description of Registrant’s Securities to be Registered.

For a description of the 5.750% Notes due 2035 to be registered hereunder, reference is made to the information under the headings “Description of the Debt Securities” and “Description of the Guarantees” in the Prospectus, dated June 3, 2025, constituting a part of the registrants’ registration statement on Form F-3 (File Nos. 333-287733, 333-287733-01, 333-287733-02 and 333-287733-03), as supplemented by the information under the heading “Description of the Notes” in the Registrants’ Prospectus Supplement, dated June 4, 2025, which information is hereby incorporated herein by reference and made part of this registration statement on Form 8-A in its entirety.

This registration statement on Form 8-A is incorporated by reference into the registrants’ registration statement on Form F-3 (File Nos. 333-287733, 333-287733-01, 333-287733-02 and 333-287733-03).

Item 2. Exhibits.

The registrants intend to register the above referenced notes on the New York Stock Exchange, on which exchange the American Depositary Shares of Gerdau S.A. are listed. Accordingly, copies of the following exhibits are filed with the Securities and Exchange Commission (“SEC”) as exhibits to this Registration Statement:

Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the Registrants have duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

Exhibit Index