X0202 SCHEDULE 13G/A 0001172661-26-001126 0001481669 XXXXXXXX LIVE 12 Common stock, $1.00 per share 03/31/2026 0000063276 MATTEL, INC. 577081102 333 CONTINENTAL BLVD El Segundo CA 90245 Rule 13d-1(b) EdgePoint Investment Group Inc. b A6 34783416.00 14357466.00 34783416.00 14357466.00 49140882.00 N 16.26 IA FI MATTEL, INC. 333 Continental Blvd., El Segundo, CA 90245-5012 This Schedule 13G is being filed on behalf of EdgePoint Investment Group Inc. ("EdgePoint") with respect to the Common Stock, with par value $1.00 per share ("Common Stock"), of MATTEL, INC. (the "Issuer"). EdgePoint acts as investment manager to, and exercises investment discretion with respect to the Common Stock directly owned by, a number of private investment funds and mutual fund trusts. 150 Bloor Street West, Suite 700, Toronto, Ontario M5S 2X9, Canada Ontario, Canada N IA FI NA 49,140,882 16.26% 34,783,416 14,357,466 34,783,416 14,357,466 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11. EdgePoint Investment Group Inc. Sayuri Childs 05/15/2026