# EDGAR Filing Document

**Accession Number:** 0001073404
**File Stem:** 0001292814-26-001726
**Filing Date:** 2026-3
**Character Count:** 7811
**Document Hash:** 1a43069e747671130c6a74d861f52e36
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001292814-26-001726.hdr.sgml**: 20260324

**ACCESSION NUMBER**: 0001292814-26-001726

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260320

**FILED AS OF DATE**: 20260324

**DATE AS OF CHANGE**: 20260324

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Johannpeter Guilherme Chagas Gerdau
- **CENTRAL INDEX KEY:** 0002121459

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-14878
- **FILM NUMBER:** 26787957

**MAIL ADDRESS:**
- **ADDRESS IS A NON US LOCATION:** YES
- **STREET 1:** AVENUE DOUTORA RUTH DE CARDOSO, 8501
- **STREET 2:** 8TH FLOOR, PINHEIROS
- **CITY:** SAO PAULO
- **NON US STATE TERRITORY:** SAO PAULO
- **PROVINCE COUNTRY:** D5
- **ZIP:** 05425-070
**ISSUER**: 

**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

**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

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[ ] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Johannpeter Guilherme Chagas Gerdau<br><sub>(Last) (First) (Middle)</sub><br>AVENUE DOUTORA RUTH DE CARDOSO, 8501<br>8TH FLOOR, PINHEIROS<br><sub>(Street)</sub><br>SAO PAULO, BRAZIL 05425-070<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-03-20 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[ ] Director [ ] 10% Owner<br>[ ] Officer (give title below) [X] Other (specify below)<br>_Vice-Chairman of Board_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>GERDAU S.A. [ GGB ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Preferred shares | 2026-03-20 |  | S |  | 85607 | D | 3.29<sup>(1)</sup> | 0 | D |  |
| Common shares |  |  |  |  |  |  |  | 702952615 | I | Remarks<sup>(2)</sup> |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Restricted Stock Units | 3.69<sup>(1)</sup> |  |  |  |  |  |  | 2027-02-12<sup>(3)</sup> | 2027-02-12 | Preferred shares | 106519 |  | 106519 | D |  |
| Restricted Stock Units | 3.69<sup>(1)</sup> |  |  |  |  |  |  | 2028-02-12<sup>(4)</sup> | 2028-02-12 | Preferred shares | 116745 |  | 116745 | D |  |
| Restricted Stock Units | 3.69<sup>(1)</sup> |  |  |  |  |  |  | 2029-02-12<sup>(5)</sup> | 2029-02-12 | Preferred shares | 105670 |  | 105670 | D |  |

---

### Footnotes:

(1) The price is denominated in Brazilian reais and has been translated into U.S. dollars at the March 20, 2026 selling rate of R$5.2800 per US$1.00, as reported by the Central Bank of Brazil.

(2) See remarks below.

(3) Restricted stock units vest on February 12, 2027.

(4) Restricted stock units vest on February 12, 2028.

(5) Restricted stock units vest on February 12, 2029.

**Remarks:**
The Reporting Person has a 25% interest in Frepar Participacoes S.A.. Frepar Participacoes S.A. holds a 25% equity interest in INDAC - Investimentos e Participacoes S.A. INDAC owns 57% of Grupo Gerdau Empreendimentos Ltda. INDAC holds 100% of Acoter Participacoes Ltda. Acoter Participacoes Ltda. owns the remaining 43% of Grupo Gerdau Empreendimentos Ltda. Grupo Gerdau Empreendimentos Ltda. together with INDAC hold 27,58% of Gerdau Metalurgica S.A.'s total shares. Gerdau Metalurgica S.A. is the direct controlling shareholder of the issuer, owning 35,56% of its shares. The Reporting Person disclaims beneficial ownership of the reported securities except to the extent of their pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.

**Signature:** /s/ Guilherme Chagas Gerdau Johannpeter  
**Date:** 2026-03-24

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**