Mattel officer plans $586,912.49 stock sale

MATTEL INC (MAT) received a Rule 144 notice indicating that officer Isaias Zanatta Roberto Jacobo plans to sell up to 39,083 shares of Mattel common stock through Fidelity Brokerage Services LLC on or after August 31, 2026.

Rhea-AI Filing Summary

MATTEL INC (MAT) received a Rule 144 notice indicating that officer Isaias Zanatta Roberto Jacobo plans to sell up to 39,083 shares of Mattel common stock through Fidelity Brokerage Services LLC on or after August 31, 2026. The filing lists an approximate aggregate market value of $586,912.49 for these shares and states that 285,700,000 shares of common stock are outstanding; this is a baseline figure, not the amount being offered. The shares relate to multiple restricted stock vesting events in 2025 and 2026 treated as compensation from the issuer.

Key Figures

Shares to be sold: 39,083 shares of common stock Aggregate market value: $586,912.49 Shares outstanding: 285,700,000 shares +3 more

6 metrics

Shares to be sold 39,083 shares of common stock Maximum number of Mattel shares covered by the Rule 144 notice

Aggregate market value $586,912.49 Approximate aggregate market value of the 39,083 shares

Shares outstanding 285,700,000 shares Mattel common shares outstanding as referenced in the notice

Vesting lot (04/25/2025) 6,594 shares Restricted Stock Vesting on April 25, 2025 as compensation

Vesting lot (04/28/2025) 6,948 shares Restricted Stock Vesting on April 28, 2025 as compensation

Vesting lot (05/07/2026) 8,718 shares Restricted Stock Vesting on May 7, 2026 as compensation

Key Terms

Rule 144, Restricted Stock Vesting, attorney-in-fact, aggregate market value

4 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Vesting financial

"Common | 04/25/2025 | Restricted Stock Vesting | Issuer"

Restricted stock vesting is the timetable and conditions under which shares granted to employees or insiders become fully owned and can be sold, typically requiring continued work or meeting performance goals. It matters to investors because large blocks of shares can become tradable at once, which can change share supply and price, and because vesting aligns insiders’ incentives with the company’s long‑term performance—think of it like a timed unlock that both rewards and locks in key people.

attorney-in-fact regulatory

"as attorney-in-fact for Roberto J. Isaias Zanatta."

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

aggregate market value financial

"| 39083 | 586912.49 | 285700000 | 08/31/2026 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

What share amount is being registered for potential sale under Rule 144 for MAT?

The notice covers up to 39,083 shares of Mattel Inc. common stock for potential sale under Rule 144. These shares are associated with several restricted stock vesting events in 2025 and 2026 and are to be sold through Fidelity Brokerage Services LLC.

What is the approximate market value of the MAT shares in this Form 144?

The filing states an approximate aggregate market value of $586,912.49 for the 39,083 Mattel common shares covered by the Rule 144 notice. This value reflects the estimated market value at the time of the notice.

How many MAT shares are outstanding according to this Form 144?

The notice reports that 285,700,000 shares of Mattel Inc. common stock are outstanding. This figure is provided as context for the potential Rule 144 sale and is not the amount being sold.

Who is the person for whose account MAT shares may be sold in this filing?

The person for whose account the securities may be sold is Isaias Zanatta Roberto Jacobo, identified as an officer. Fidelity Brokerage Services LLC is named as the broker handling the potential sale under Rule 144.

What is the source of the MAT shares to be sold under this Rule 144 notice?

The shares come from restricted stock vesting granted as compensation by Mattel Inc. Vesting events include dates such as April 25, 2025, April 28, 2025, April 29, 2025, April 25, 2026, April 28, 2026, and May 7, 2026, each with a specific share amount.

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

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Available on EDGAR 08/31/2026 - 04:05 PM Accepted by SEC EDGAR 08/31/2026 - 04:03 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001767603
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	MATTEL INC /DE/
SEC File Number	001-05647
Address of Issuer	333 CONTINENTAL BLVD EL SEGUNDO CALIFORNIA 90245
Phone	3102522000
Name of Person for Whose Account the Securities are To Be Sold	Isaias Zanatta Roberto Jacobo
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	39083	586912.49	285700000	08/31/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	04/25/2025	Restricted Stock Vesting	Issuer			6594	04/25/2025	Compensation
Common	04/28/2025	Restricted Stock Vesting	Issuer			6948	04/28/2025	Compensation
Common	04/29/2025	Restricted Stock Vesting	Issuer			3097	04/29/2025	Compensation
Common	04/25/2026	Restricted Stock Vesting	Issuer			6582	04/25/2026	Compensation
Common	04/28/2026	Restricted Stock Vesting	Issuer			7144	04/28/2026	Compensation
Common	05/07/2026	Restricted Stock Vesting	Issuer			8718	05/07/2026	Compensation

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/31/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Joshua Schmitt, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Roberto J. Isaias Zanatta.
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)