144 0001932069 XXXXXXXX LIVE 0000868780 Dorman Products, Inc. 000-18914 3400 E WALNUT ST COLMAR PA 18915 2159971800 McKnight John Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

8185 1140339.75 30517484 12/03/2024 NASDAQ Common 09/30/2020 ESPP Purchase Issuer N 498 09/30/2020 Cash Common 11/01/2020 Restricted Stock Vesting Issuer N 242 11/01/2020 Compensation Common 03/02/2021 Restricted Stock Vesting Issuer N 114 03/02/2021 Compensation Common 03/31/2021 ESPP Purchase Issuer N 82 03/31/2021 Cash Common 09/30/2021 ESPP Purchase Issuer N 179 09/30/2021 Cash Common 11/01/2021 Restricted Stock Vesting Issuer N 191 11/01/2021 Compensation Common 03/02/2022 Restricted Stock Vesting Issuer N 199 03/02/2022 Compensation Common 06/30/2022 ESPP Purchase Issuer N 117 06/30/2022 Cash Common 11/01/2022 Restricted Stock Vesting Issuer N 191 11/01/2022 Compensation Common 12/30/2022 ESPP Purchase Issuer N 107 12/30/2022 Cash Common 02/22/2023 Restricted Stock Vesting Issuer N 734 02/22/2023 Compensation Common 03/02/2023 Restricted Stock Vesting Issuer N 317 03/02/2023 Compensation Common 06/30/2023 ESPP Purchase Issuer N 163 06/30/2023 Cash Common 11/01/2023 Restricted Stock Vesting Issuer N 191 11/01/2023 Compensation Common 12/03/2024 Option Granted - 03/02/2020 Issuer N 2912 12/03/2024 Cash Common 12/03/2024 Option Granted - 03/02/2022 Issuer N 1246 12/03/2024 Cash Common 12/03/2024 Option Granted - 03/02/2023 Issuer N 702 12/03/2024 Cash Y 12/03/2024 /s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for John R. Mcknight