X0609 4 2026-08-17 0 0000868780 Dorman Products, Inc. DORM 0001931700 Long Donna M. false C/O DORMAN PRODUCTS, INC. 3400 EAST WALNUT STREET COLMAR PA 18915 0 1 0 0 SVP, CIO 1 Common Stock 2026-08-17 4 S 0 734 135.21 D 19338.8738 D Represents shares of the Issuer's common stock sold by the reporting person in accordance with a Rule 10b5-1 trading arrangement adopted by the reporting person on August 20, 2025. The filing of this Statement shall not be construed as an admission (a) that the person filing this Statement is, for the purposes of Section 16 of the Securities Exchange Act of 1934, as amended, the beneficial owner of any equity securities covered by this Statement, or (b) that this Statement is legally required to be filed by such person. /s/ Frank J. Mahr, by Power of Attorney 2026-08-18