Gerdau executive sells 10,387 preferred ADR shares

Gerdau S.A. senior manager Marcos Zilles Mattiello reported selling 10,387.111 preferred shares (American Depositary Receipts) on June 8, 2026 at $5.11 per share in an open-market or private transaction.

Rhea-AI Filing Summary

Gerdau S.A. senior manager Marcos Zilles Mattiello reported selling 10,387.111 preferred shares (American Depositary Receipts) on June 8, 2026 at $5.11 per share in an open-market or private transaction. He continues to hold Restricted Stock Units convertible into 18,119 preferred shares at an exercise price of $4.04 vesting on March 1, 2029.

Insider Trade Summary

Net Seller: 10,387.111 shares

Net Sell 3 txns

Insider Mattiello Marcos Zilles

Role Insider

Sold 10,387.111 shs ($53K)

Type	Security	Shares	Price	Value
Sale	Preferred shares F1	10,387.111	$5.11	$53K
holding	Restricted Stock Units F2	--	--	--
holding	Preferred shares	--	--	--

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

Footnotes (2)

1. F1. American Depositary Receipts.
2. F2. Restricted stock units vest on March, 1, 2029 (American Depositary Receipts)

Key Figures

Shares sold: 10,387.111 preferred shares Sale price: $5.11 per share RSU underlying shares: 18,119.0000 preferred shares +2 more

5 metrics

Shares sold 10,387.111 preferred shares Non-derivative sale on June 8, 2026

Sale price $5.11 per share Price for preferred shares (ADRs) sold on June 8, 2026

RSU underlying shares 18,119.0000 preferred shares Underlying shares for Restricted Stock Units held directly

RSU exercise price 4.0400 Exercise price per underlying preferred share for RSUs

RSU vesting/expiration date 2029-03-01 Vesting and expiration date for Restricted Stock Units

Key Terms

Restricted Stock Units, American Depositary Receipts, exercise price

3 terms

Restricted Stock Units financial

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

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

American Depositary Receipts financial

"American Depositary Receipts."

A certificate traded on U.S. markets that represents ownership of shares in a foreign company, letting U.S. investors buy and sell that company as if it were listed domestically. Think of it as a local voucher for a foreign product: it makes price quotes in dollars, trades on familiar exchanges, and brings differences in liquidity, fees and legal protections that can affect returns and risk compared with buying the underlying foreign shares directly.

exercise price financial

"conversion_or_exercise_price: "4.0400""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Gerdau S.A. (GGB) report on this Form 4?

Gerdau S.A. reported that senior manager Marcos Zilles Mattiello sold 10,387.111 preferred shares (ADRs) on June 8, 2026 at $5.11 per share in an open-market or private transaction.

At what price were the GGB preferred shares sold by the insider?

The reported sale was executed at an average price of $5.11 per preferred share (American Depositary Receipts). The transaction involved 10,387.111 shares on June 8, 2026, according to the Form 4 data.

Did the Gerdau (GGB) insider retain any equity awards after this sale?

Yes. The insider holds Restricted Stock Units covering 18,119 underlying preferred shares with an exercise price of $4.04. These RSUs are scheduled to vest on March 1, 2029, based on the filing.

What type of securities did the GGB insider sell and what do the footnotes indicate?

The insider sold preferred shares, identified in the footnotes as American Depositary Receipts. A separate footnote states the restricted stock units vest on March 1, 2029, also referencing American Depositary Receipts.

Were there any option or RSU exercises reported for Gerdau (GGB) in this Form 4?

No option or RSU exercises were reported. The Form 4 lists a sale of preferred shares and a holding entry for Restricted Stock Units representing 18,119 underlying preferred shares with a $4.04 exercise price expiring March 1, 2029.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/14/2026 - 08:56 AM Accepted by SEC EDGAR 08/14/2026 - 08:55 AM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

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

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

	Director		10% Owner
	Officer (give title below)	X	Other (specify below)
			Senior Management

2a. Foreign Trading Symbol
[GGBR]

3. Date of Earliest Transaction (Month/Day/Year)
06/08/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Preferred shares(1)	06/08/2026		S		10,387.111	D	$5.11	0	D
Preferred shares								8,997	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	$4.04							03/01/2029(2)	03/01/2029	Preferred shares	18,119		18,119	D

Explanation of Responses:

1. American Depositary Receipts.

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

	/s/ Marcos Zilles Mattiello	08/14/2026
	** 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.
* Form 4: SEC 1474 (03-26)