MAT Mattel Inc

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM SD

SPECIALIZED DISCLOSURE REPORT

Mr. Roberto Isaias

Executive Vice President & Chief Supply Chain Officer

(310) 252-2000

(Name and telephone number, including area code, of the person to contact in connection with this report)

Check the appropriate box to indicate the rule pursuant to which this form is being filed, and provide the period to which the information in this form applies:

Section 1 – Conflict Minerals Disclosure

Item 1.01. Conflict Minerals Disclosure and Report.

Conflict Minerals Disclosure

A copy of this Form SD is publicly available on the “SEC Filings” page of Mattel’s website at https://mattel.gcs-web.com/financial-information/sec-filings ; and the Conflict Minerals Report filed for the calendar year ended December 31, 2018 is available at http://corporate.mattel.com/about-us/2018MattelConflictMineralsReport.pdf .

Item 1.02. Exhibit.

A Conflict Minerals Report for the calendar year ended December 31, 2018 is filed herewith as Exhibit 1.01. The Conflict Minerals Report filed for the calendar year ended December 31, 2018 is also available at http://corporate.mattel.com/about-us/2018MattelConflictMineralsReport.pdf .

Section 2 – Exhibits

Item 2.01. Exhibits.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, the registrant has duly caused this report to be signed on its behalf by the duly authorized undersigned.