(MAT)

Reporting relationship: Pres., Chief Mktg & Brand Ofc
Issuer ticker: MAT
Reported as of: 30 Sep 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 02 Oct 2026, 16:22:05 UTC
Prior SEC filing: 04 Aug 2026
Source filing: View source filing
Reporting owner signature: /s/ Tiffani Magri, Attorney-in-Fact for Roberto Seixas Stanichi

Filing notes and source

Key filing fact

Roberto Seixas Stanichi filed Form 4 for MATTEL INC /DE/ (MAT) on 02 Oct 2026.

Key facts

This page summarizes Roberto Seixas Stanichi's Form 4 filing for MATTEL INC /DE/ (MAT).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 02 Oct 2026, 16:22.

Change

Previous filing in this sequence was filed on 04 Aug 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002148131 Primary reporting owner

Stanichi Roberto Seixas

Relationship: Pres., Chief Mktg & Brand Ofc
Address: 333 CONTINENTAL BOULEVARD, EL SEGUNDO
Signature: /s/ Tiffani Magri, Attorney-in-Fact for Roberto Seixas Stanichi
Signature date: 02 Oct 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MAT transaction

Common Stock

Options Exercise

Transaction value
Shares: +1,715
Change %: +3.7%
Price
Shares after: 47,644
Date: 30 Sep 2026
Ownership: Direct
Footnotes: F1

MAT transaction

Common Stock

Tax liability

Transaction value
Shares: -873
Change %: -1.8%
Price: $12.66^*
Shares after: 46,771
Date: 30 Sep 2026
Ownership: Direct
Footnotes: F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MAT transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value
Shares: -1,715
Change %: -33%
Price: $0.000000^*
Shares after: 3,484
Date: 30 Sep 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 1,715
Exercise price
Footnotes: F1

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

As reported on a Form 3 dated July 29, 2026 and filed on August 4, 2026, the Reporting Person received a grant of 5,199 Restricted Stock Units ("RSUs" or "Units") on September 30, 2025. The RSUs vest as to (a) 33% of the Units granted on the first anniversary of the date of grant, (b) an additional 33% of the Units granted on the second anniversary of the date of grant, and (c) the remaining 34% of the Units granted on the third anniversary of the date of grant. On each vesting date, for each Unit vesting on such date, the Reporting Person will receive one share of Mattel, Inc. Common Stock, subject to tax withholding. On September 30, 2026, the first 33% of these RSUs vested, resulting in the issuance of 1,715 shares of Mattel, Inc. Common Stock.

Footnote F2

Pursuant to the terms of the September 30, 2025 RSU grant, 873 shares of Mattel, Inc. Common Stock were automatically withheld at vesting to cover required tax withholding.