X0306 4 2021-12-13 0 0000868780 Dorman Products, Inc. DORM 0001205405 BERMAN STEVEN L C/O DORMAN PRODUCTS, INC. 3400 EAST WALNUT STREET COLMAR PA 18915 1 1 0 0 Executive Chairman Common Stock 2021-12-13 4 M 0 4909 78.64 A 992297 D Common Stock 54770 I By Charitable Remainder Trust Common Stock 24866 I By401(k) Common Stock 100000 I By trust Employee Stock Option (right to buy) 78.64 2021-12-13 4 M 0 4909 0.00 D 2022-02-27 Common Stock 4909 0 D The shares are represented by units held in a unitized stock fund through the Issuer's 401(k) Retirement Plan and Trust. The unitized stock fund of the Issuer's 401(k) Retirement Plan and Trust consists of cash and common stock in amounts that vary from time to time. As of November 4, 2021, the reporting person had 16,400 units in the Issuer's 401(k) Retirement Plan and Trust, which units consisted of 24,866 shares of common stock. These shares are held in trust for the benefit of the reporting person's grandchildren. The reporting person's spouse is a co-trustee of the trust. The reporting person disclaims beneficial ownership of the shares held by such trust, and this report should not be deemed an admission that the reporting person is the beneficial owner of the trust's shares for purposes of Section 16 or for any other purpose. The option vested in four equal annual installments beginning on February 27, 2018, which was the first anniversary of the date of grant. 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 2021-12-14