Sec Form 4 Filing - Isaias Zanatta Roberto Jacobo @ MATTEL INC /DE/ - 2022-02-28

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

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, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Isaias Zanatta Roberto Jacobo 2. Issuer Name and Ticker or Trading Symbol MATTEL INC /DE/ [ MAT] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) _____ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) EVP & Chief Supply Chain Offr (Last) (First) (Middle) 333 CONTINENTAL BOULEVARD 3. Date of Earliest Transaction (MM/DD/YY) 02/28/2022 (Street) EL SEGUNDO, CA90245 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 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 Common Stock 02/28/2022 M 2,948 A 61,983 D Common Stock 02/28/2022 F 1,462( 2 ) D $ 24.98 60,521 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 (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 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 (MM/DD/YY) 7. Title and Amount of Underlying Securities (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 of Derivative Security: 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 ( 1 ) 02/28/2022 M 2,948 ( 1 ) ( 1 ) Common Stock 2,948 $ 0 0 D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Isaias Zanatta Roberto Jacobo 333 CONTINENTAL BOULEVARD EL SEGUNDO, CA90245 EVP & Chief Supply Chain Offr Signatures /s/ Tiffani Magri, Attorney-in-Fact for Roberto Jacobo Isaias Zanatta 03/02/2022 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As reported on a Form 4 dated February 28, 2019 and filed on March 4, 2019, the Reporting Person received a grant of 8,669 Restricted Stock Units ("RSUs" or "Units") on February 28, 2019. The RSUs vested 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 received one share of Mattel, Inc. Common Stock, subject to tax withholding. On February 28, 2022, the final 34% of these RSUs vested, resulting in the issuance of 2,948 shares of Mattel, Inc. Common Stock. ( 2 )Pursuant to the terms of the February 28, 2019 RSU grant, 1,462 shares of Mattel, Inc. Common Stock were automatically withheld at vesting to cover required tax withholding.

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).

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