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Form 3 GERDAU S.A. For: Mar 17 Filed by: Johannpeter Claudio

March 18, 2026 9:56 PM
FORM 3 UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
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1. Name and Address of Reporting Person *
Johannpeter Claudio
(Last) (First) (Middle)
AVENUE DOUTORA RUTH DE CARDOSO, 8501
8TH FLOOR, PINHEIROS
(Street)
SAO PAULO 05425-070
(City) (State) (Zip)
2. Date of Event Requiring Statement (Month/Day/Year)
03/17/2026 		3. Issuer Name and Ticker or Trading Symbol
GERDAU S.A. [ GGB ]
4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director 10% Owner
Officer (give title below) X Other (specify below)
Vice-Chairman of Board
 5. If Amendment, Date of Original Filed (Month/Day/Year)
6. Individual or Joint/Group Filing (Check Applicable Line)
X Form filed by One Reporting Person
Form filed by More than One Reporting Person
Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4) 2. Amount of Securities Beneficially Owned (Instr. 4) 3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 4. Nature of Indirect Beneficial Ownership (Instr. 5)
Preferred shares 85,607
D
Common shares 702,952,615
I
Remarks (4)
Preferred shares 283
I
Preferred shares held by an immediate family member (relationship: son).
Table II - Derivative Securities Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4) 2. Date Exercisable and Expiration Date (Month/Day/Year) 3. Title and Amount of Securities Underlying Derivative Security (Instr. 4) 4. Conversion or Exercise Price of Derivative Security 5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5) 6. Nature of Indirect Beneficial Ownership (Instr. 5)
Date Exercisable Expiration Date Title Amount or Number of Shares
Restricted Stock Units (1) 02/12/2027 Preferred shares 106,519 19.5 D
Restricted Stock Units (2) 02/12/2028 Preferred shares 116,745 18.32 D
Restricted Stock Units (3) 02/12/2029 Preferred shares 105,670 20.83 D
Explanation of Responses:
1. Restricted stock units vest on February 12, 2027. Exercise price denominated in Brazilian reais (R$).
2. Restricted stock units vest on February 12, 2028. Exercise price denominated in Brazilian reais (R$).
3. Restricted stock units vest on February 12, 2029. Exercise price denominated in Brazilian reais (R$).
4. See remarks below
Remarks:
The Reporting Person has a 20% interest in Klapar Participacoes S.A.. Klapar 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, jointly controls Gerdau Metalurgica S.A. 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.
Claudio Johannpeter 03/17/2026
** Signature of Reporting Person Date
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.

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