[Form 3] GERDAU S.A. Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

GERDAU S.A. Executive Vice President Mauricio Metz filed an initial ownership report showing his existing equity interests in the company. The filing lists direct holdings of 43,536 preferred shares.

It also shows several grants of restricted stock units, each tied to preferred shares. These RSUs are linked to 4,060, 32,280, 6,332 and 6,683 underlying preferred shares, with exercise prices denominated in Brazilian reais and vesting on February 12, 2027, February 22, 2027, February 12, 2028 and February 12, 2029, respectively. The report reflects holdings only, with no reported purchases or sales.

SEC Form 3

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^*

Metz Mauricio

(Last) (First) (Middle)

AVENUE DOUTORA RUTH DE CARDOSO, 8501

8TH FLOOR, PINHEIROS

(Street)

SAO PAULO SAO PAULO 05425-070

(City) (State) (Zip)

BRAZIL

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/17/2026

3. Issuer Name and Ticker or Trading Symbol
GERDAU S.A. [ GBB ]

3a. Foreign Trading Symbol
[GGBR]

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Executive Vice President

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	43,536	D

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	4,060	$19.5	D
Restricted Stock Units	(2)	02/22/2027	Preferred shares	32,280	$19.5	D
Restricted Stock Units	(3)	02/12/2028	Preferred shares	6,332	$18.32	D
Restricted Stock Units	(4)	02/12/2029	Preferred shares	6,683	$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 22, 2027. Exercise price denominated in Brazilian reais (R$).

3. Restricted stock units vest on February 12, 2028. Exercise price denominated in Brazilian reais (R$).

4. Restricted stock units vest on February 12, 2029. Exercise price denominated in Brazilian reais (R$).

	Mauricio Metz	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 5 (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.
* Form 3: SEC 1473 (03-26)