Mattel, Inc.

Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On April 7, 2026, Mattel, Inc. (the “Company”) announced that, effective May 1, 2026, Steve Totzke will cease to serve as President and Chief Commercial Officer and Sanjay Luthra, Executive Vice President and Managing Director of EMEA and Global Direct-to-Consumer, will succeed Mr. Totzke as Chief Commercial Officer, overseeing Mattel’s global sales and commercial operations. Mr. Luthra will report to the Company’s Chairman and Chief Executive Officer, Ynon Kreiz. To help ensure a smooth transition, Mr. Totzke will serve in a non-executive officer advisory role as Executive Advisor and President, Strategic Transition, from May 1, 2026 through December 31, 2026 (the “Termination Date”), with the same compensation terms and conditions that he is currently receiving. Mr. Totzke’s employment with the Company will terminate effective as of the Termination Date. Mr. Totzke entered into a separation letter agreement with the Company, dated April 7, 2026 (the “Separation Agreement”), which provides for Mr. Totzke’s transition as described above. In connection with Mr. Totzke’s departure from the Company on the Termination Date, he will be entitled to receive severance payments and benefits, and accelerated vesting of certain equity awards, as a result of a Covered Termination as defined in and in accordance with the terms of the Company’s Amended and Restated Executive Severance Plan B, and an Involuntary Retirement as defined in and in accordance with the terms of the Company’s Amended and Restated 2010 Equity and Long-Term Compensation Plan. In addition, Mr. Totzke will receive a monthly cash payment for up to eighteen months in an amount equal to the applicable COBRA premium for his level of coverage in place as of the Termination Date, and will continue to receive his existing car allowance for the same period. The foregoing summary of the Separation Agreement is qualified in its entirety by reference to the full text of the Separation Agreement, a copy of which is included as Exhibit 10.1 hereto. Section 7 - Regulation FD

Item 7.01. Regulation FD Disclosure. On April 7, 2026, the Company issued a press release announcing Mr. Totzke’s separation from the Company, a copy of which is furnished as Exhibit 99.1 hereto. In accordance with General Instruction B.2 of Form 8-K, the information in this Item 7.01, including Exhibit 99.1, shall not be deemed to be “filed” for purposes of Section 18 of the Securities and Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement or other document filed under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing. Section 9 - Financial Statements and Exhibits