144 0001769146 XXXXXXXX LIVE 0000868780 Dorman Products, Inc. 000-18914 3400 E WALNUT ST COLMAR PA 18915 215-9971800 Hession David Officer Common Stifel Nicolaus & Company Inc

501 N Broadway St Louis MO 63102

12493 1691200.1 30562644 10/31/2025 NASDAQ Common 03/01/2020 Restricted Stock Vesting Issuer N 560 03/01/2020 Compensation Common 03/06/2020 Restricted Stock Vesting Issuer N 117 03/06/2020 Compensation Common 03/31/2020 ESPP Purchase Issuer N 356 03/31/2020 Cash Common 03/01/2021 Restricted Stock Vesting Issuer N 605 03/01/2021 Compensation Common 03/02/2021 Restricted Stock Vesting Issuer N 334 03/02/2021 Compensation Common 03/06/2021 Restricted Stock Vesting Issuer N 115 03/06/2021 Compensation Common 03/31/2021 ESPP Purchase Issuer N 148 03/31/2021 Cash Common 09/30/2021 ESPP Purchase Issuer N 128 09/30/2021 Cash Common 03/01/2022 Restricted Stock Vesting Issuer N 605 03/01/2022 Compensation Common 03/02/2022 Restricted Stock Vesting Issuer N 138 03/02/2022 Compensation Common 03/02/2022 Restricted Stock Vesting Issuer N 334 03/02/2022 Compensation Common 03/06/2022 Restricted Stock Vesting Issuer N 115 03/06/2022 Compensation Common 03/06/2022 Restricted Stock Vesting Issuer N 744 03/06/2022 Compensation Common 06/30/2022 ESPP Purchase Issuer N 125 06/30/2022 Cash Common 12/30/2022 ESPP Purchase Issuer N 99 12/30/2022 Cash Common 02/22/2023 Restricted Stock Vesting Issuer N 2255 02/22/2023 Compensation Common 03/02/2023 Restricted Stock Vesting Issuer N 334 03/02/2023 Compensation Common 03/02/2023 Restricted Stock Vesting Issuer N 168 03/02/2023 Compensation Common 03/02/2023 Restricted Stock Vesting Issuer N 138 03/02/2023 Compensation Common 03/06/2023 Restricted Stock Vesting Issuer N 115 03/06/2023 Compensation Common 06/30/2023 ESPP Purchase Issuer N 175 06/30/2023 Cash Common 03/01/2024 Restricted Stock Vesting Issuer N 336 03/01/2024 Compensation Common 03/01/2024 Restricted Stock Vesting Issuer N 138 03/01/2024 Compensation Common 03/01/2024 Restricted Stock Vesting Issuer N 168 03/01/2024 Compensation Common 03/01/2024 Restricted Stock Vesting Issuer N 220 03/01/2024 Compensation Common 02/20/2025 Restricted Stock Vesting Issuer N 1404 02/20/2025 Compensation Common 02/28/2025 Restricted Stock Vesting Issuer N 110 02/28/2025 Compensation Common 02/28/2025 Restricted Stock Vesting Issuer N 1465 02/28/2025 Compensation Common 02/28/2025 Restricted Stock Vesting Issuer N 132 02/28/2025 Compensation Common 02/28/2025 Restricted Stock Vesting Issuer N 174 02/28/2025 Compensation Common 03/04/2025 Restricted Stock Vesting Issuer N 638 03/04/2025 Compensation Y 10/31/2025 /s/ David Hession