Dorman Products Inc

This year’s annual meeting will be a virtual meeting conducted via live audio webcast where you can view the meeting agenda and other materials made available online. You will not be able to attend the annual meeting in person. We have structured our virtual meeting to provide shareholders the same rights as if the meeting were held in person, including the ability to vote shares electronically during the meeting and ask questions in accordance with the rules of conduct for the meeting. The Company believes that a virtual meeting affords shareholders who might not be in a position to travel to the meeting the ability still to participate and helps manage costs.

Attending the meeting for the Company will be members of the senior leadership team, members of the Board, and representatives from our independent auditor, KPMG.

To attend and participate in the annual meeting, visitwww.virtualshareholdermeeting.com/DORM2025 and enter the control number included on your proxy card. The live webcast will begin at 8:30 a.m. EDT on Friday, May 16, 2025. We encourage you to access the

virtual meeting platform at least 15 minutes prior to the start time. If you do not have a control number, you will still be able to access the live webcast as a guest, but you will not be able to vote or ask a question during the meeting.

The virtual meeting platform is fully supported across browsers (Internet Explorer, Firefox, Chrome, and Safari) and devices (desktops, laptops, tablets, and mobile phones) running the most updated version of applicable software and plugins. Participants should ensure they have a strong WiFi connection wherever they intend to participate in the meeting. Further instructions on how to attend and participate in the annual meeting, including how to demonstrate proof of stock ownership and how to ask questions during the annual meeting, will be posted on the virtual meeting website.

We will have technicians ready to assist you with any technical difficulties you may have accessing the virtual meeting. Technical support will be available on the virtual meeting platform beginning at 8:15 a.m. EDT on the day of the meeting.