Gerdau (NYSE: GGB) senior manager files initial Form 3 holdings

Rhea-AI Filing Summary

GERDAU S.A. senior manager Marcos Zilles Mattiello filed an initial Form 3 showing his equity holdings. He reports restricted stock units linked to 18,119 preferred shares that vest on March 1, 2029 as American Depositary Receipts, plus 8,997 preferred shares held directly.

Insider Trade Summary

2 transactions reported

Mixed 2 txns

Insider Mattiello Marcos Zilles

Role Insider

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

Holdings After Transaction: Restricted Stock Units — 18,119 shares (Direct); Preferred shares — 8,997 shares (Direct)

Footnotes (1)

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Understanding Insider Trading Forms →

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^*

Mattiello Marcos Zilles

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

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	8,997	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)	03/01/2029	Preferred shares	18,119	$4.04	D

Explanation of Responses:

1. Restricted stock units vest on March, 1, 2029 (American Depositary Receipts).

	Marcos Zilles Mattiello	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)

FAQ

What does the Form 3 filed by Gerdau (GGB) senior management report?

The Form 3 reports Marcos Zilles Mattiello’s initial beneficial ownership in Gerdau. It lists restricted stock units tied to preferred shares and a separate direct holding of preferred shares, establishing his starting equity position as a company insider.

How many restricted stock units does Marcos Zilles Mattiello report in Gerdau (GGB)?

He reports restricted stock units representing 18,119 underlying preferred shares. These units are a form of deferred equity compensation and are linked to American Depositary Receipts that will vest on a specified future date if conditions are met.

When do the reported Gerdau (GGB) restricted stock units vest?

The restricted stock units vest on March 1, 2029, according to the footnote. Vesting means the units convert into the underlying American Depositary Receipts at that date, assuming any service or performance requirements set by the company are satisfied.

What direct share holdings are disclosed in this Gerdau (GGB) Form 3?

The insider reports direct ownership of 8,997 preferred shares of Gerdau. This is separate from the restricted stock units and reflects shares already held outright in his name, rather than subject to future vesting conditions.

Does the Gerdau (GGB) Form 3 show any recent insider buying or selling?

No, the Form 3 presents holdings rather than recent trades. The transactions are classified as holdings, with no buy or sell transaction codes, indicating disclosure of existing equity positions instead of newly executed market transactions.