Dorman Products Inc

Director and Executive Officer Trading Arrangements

The following table describes contracts, instructions, or written plans for the purchase or sale of the Company’s common stock intended to satisfy the affirmative defense conditions of Rule 10b5-1(c) (each, a “Rule 10b5-1 Plan”) entered into or terminated during the quarter ended March 29, 2025, by our directors and officers (as defined under Rule 16b-1(f) of the Exchange Act). There were nonon-Rule 10b5-1 trading arrangements entered into or terminated by our directors and officers during the quarter ended March 29, 2025.

1 Rule 10b5-1 Plan expires upon the date shown or, if earlier, upon completion of all authorized transactions under such plan (the “New Plan”).

2 Mr. Darby previously executed a Rule 10b5-1 Plan on December 5, 2024, that expires on June 30, 2025, or, if earlier, upon completion of all authorized transactions under such plan (the “Prior Plan”). The New Plan includes some of the same shares as the Prior Plan, but the New Plan is effective with respect to such shares only to the extent they remain unsold under the Prior Plan.

3 Plan includes (i) the sale of up to 3,567 shares of the Company’s common stock currently held by Mr. Darby to the extent such shares remain unsold under the Prior Plan, (ii) the potential exercise of vested stock options and the associated sale of up to 5,737 shares of the Company’s common stock, to the extent such options remain unexercised and unsold under the Prior Plan, and (iii) the sale of up to 2,231 shares of the Company’s common stock currently held by Mr. Darby.