Gerdau officer reports initial share holdings

GERDAU S.A. officer Flavia Dias da Silva de Souza filed an initial ownership report showing direct holdings in the company’s preferred shares and related restricted stock units.

Rhea-AI Filing Summary

GERDAU S.A. officer Flavia Dias da Silva de Souza filed an initial ownership report showing direct holdings in the company’s preferred shares and related restricted stock units. She directly holds 15,832 preferred shares. In addition, she holds restricted stock units that can convert into 3,570 preferred shares at R$19.5000, 7,598 preferred shares at R$18.3200, and 7,519 preferred shares at R$20.8300. These restricted stock units vest on February 12, 2027, February 12, 2028, and February 12, 2029, respectively, and each award expires on its corresponding vesting date.

Insider Trade Summary

4 transactions reported

Mixed 4 txns

Insider de Souza Flavia Dias da Silva

Role Officer

Type	Security	Shares	Price	Value
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Restricted Stock Units	--	--	--
holding	Preferred shares	--	--	--

Holdings After Transaction: Restricted Stock Units — 18,687 contracts (Direct); Preferred shares — 15,832 shares (Direct)

Footnotes (3)

1. F1. Restricted stock units vest on February 12, 2027. Exercise price denominated in Brazilian reais (R$).
2. F2. Restricted stock units vest on February 12, 2028. Exercise price denominated in Brazilian reais (R$).
3. F3. Restricted stock units vest on February 12, 2029. Exercise price denominated in Brazilian reais (R$).

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Accepted by SEC EDGAR 03/20/2026 - 04:59 PM Learn about SEC filing dates

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

OMB APPROVAL

OMB Number:			3235-0104
Estimated average burden
hours per response:			0.5

1. Name and Address of Reporting Person^*

de Souza Flavia Dias da Silva

(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. [ GGB ]

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
X	Officer (give title below)		Other (specify below)
	Officer

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	15,832	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	3,570	$19.5	D
Restricted Stock Units	(2)	02/12/2028	Preferred shares	7,598	$18.32	D
Restricted Stock Units	(3)	02/12/2029	Preferred shares	7,519	$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$).

	Flavia Dias da Silva De Souza	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)