# EDGAR Filing Document

**Accession Number:** 0001073404
**File Stem:** 0001104659-25-117794
**Filing Date:** 2025-12
**Character Count:** 3344
**Document Hash:** c22bc952a60f4e5efe6221ef089707ac
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001104659-25-117794.hdr.sgml**: 20251202

**ACCESSION NUMBER**: 0001104659-25-117794

**CONFORMED SUBMISSION TYPE**: 6-K

**PUBLIC DOCUMENT COUNT**: 3

**CONFORMED PERIOD OF REPORT**: 20251202

**FILED AS OF DATE**: 20251202

**DATE AS OF CHANGE**: 20251202

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** GERDAU S.A.
- **CENTRAL INDEX KEY:** 0001073404
- **STANDARD INDUSTRIAL CLASSIFICATION:** STEEL WORKS, BLAST FURNACES & ROLLING & FINISHING MILLS [3310]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 000000000
- **STATE OF INCORPORATION:** D5
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 6-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14878
- **FILM NUMBER:** 251544206

**BUSINESS ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** AV DOUTORA RUTH CARDOSO, 8,501
- **STREET 2:** 8TH FLOOR
- **CITY:** SAO PAULO, SP
- **PROVINCE COUNTRY:** D5
- **ZIP:** 05425-070
- **BUSINESS PHONE:** 011-55-51-3323-2703

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** AV DOUTORA RUTH CARDOSO, 8,501
- **STREET 2:** 8TH FLOOR
- **CITY:** SAO PAULO, SP
- **PROVINCE COUNTRY:** D5
- **ZIP:** 05425-070

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** GERDAU SA
- **DATE OF NAME CHANGE:** 19981112

**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 December 2, 2025

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 of Form 20-F or Form 40-F.

Form 20-F ⌧ Form 40-F ◻

<u>Exhibit Index</u>

<u>Exhibit</u> <u>Description of Exhibit</u> <br>[99.1](tm2532621d1_ex99-1.htm) [Notice to the Market, December 2, 2025](tm2532621d1_ex99-1.htm)

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: December 2, 2025

---

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

---

## Exhibit 99.1

**Exhibit 99.1**

![](tm2532621d1_ex99-1img001.jpg)

**GERDAU S.A.**

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

Company Registry (NIRE): 35300520696

**NOTICE TO THE MARKET**

**GERDAU S.A.** (B3: GGBR / NYSE: GGB) ("Company"), complementing the notice to the market dated October 30, 2025, informs that its subsidiary GUSAP III LP concluded, on December 02, 2025, the financial settlement of the prepayment of all Bonds issued, with a principal amount of US$500,000,000.00, interest rate of 4.25% and maturity in 2030.

The total amount of the redemption corresponded to US$509,710,576.46, plus interest accrued to date, in accordance with the conditions established in the Indenture for execution of financial settlement.

São Paulo, December 02, 2025

**Rafael Dorneles Japur**

Vice-President and

Investor Relations Officer