Dorman Products, Inc.

This summary highlights information contained elsewhere in this proxy statement. It does not contain all of the information you should consider, and you should read the entire proxy statement carefully before voting. References in this proxy statement to the “Company,” “Dorman,” “we,” “us,” and “our” refer to Dorman Products, Inc., a Pennsylvania corporation. This proxy statement, form of proxy, Notice of Annual Meeting of Shareholders, and the 2025 Annual Report to Shareholders are being distributed and made available to shareholders entitled to notice of and to vote at the annual meeting on or about April 6, 2026.

About Dorman

We are one of the leading suppliers of replacement and upgrade parts in the motor vehicle aftermarket industry, serving passenger cars, light-, medium-, and heavy-duty trucks as well as specialty vehicles, including all-terrain and utility terrain vehicles (ATVs and UTVs). We operate through three business segments: Light Duty, Heavy Duty, and Specialty Vehicle, consistent with the sectors of the motor vehicle aftermarket industry in which we operate. Our products are sold under our various brand names, under our customers’ private label brands, or in bulk. We are one of the leading aftermarket suppliers of parts that were traditionally available to professional installers and consumers only from original equipment manufacturers or salvage yards. These parts include, among other parts, oil filters and coolers, leaf springs, intake manifolds, exhaust manifolds, window regulators, radiator fan assemblies, tire pressure monitor sensors, exhaust gas recirculation (EGR) coolers, UTV windshields, and complex electronics modules.

Annual Meeting of Shareholders

Note: This year’s annual meeting will be a virtual meeting conducted via live webcast. You will be able to attend the annual meeting, vote your shares electronically, and submit questions during the meeting by visitingwww.virtualshareholdermeeting.com/DORM2026. The annual meeting format will be a 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. Additional information regarding attending the annual meeting, voting your shares, and submitting questions can be found in the proxy statement.

Voting Matters and the Board’s Recommendation

In addition to these matters, shareholders may be asked to vote on such other business, if any, as may properly come before the annual meeting. The Board is not aware of any other matters that will come before the annual meeting or any postponements or adjournments thereof.

How to Vote

Whether or not you attend the meeting, we urge you to vote promptly in advance of the meeting by:

visiting www.proxyvote.com;

signing and returning via mail your proxy card or voting instruction form; or

calling 1-800-690-6903.

Alternatively, you can attend and vote during the meeting by visiting www.virtualshareholdermeeting.com/DORM2026 and voting when prompted. When voting online or via phone, have your proxy card and control number handy.

Proposal I: Election of Directors

Shareholders are being asked to elect eight director candidates nominated by the Board of Directors of Dorman (the “Board of Directors” or “Board”). Below is information regarding the nominees and their background and experience in support of the Board’s recommendation that shareholders vote “For” each of the nominees.

Director Nominees

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Director Profiles and Experience

Proposal II: Advisory Approval of the Compensation of Our Named Executive Officers

Our executive compensation program is designed to promote the successful implementation of our annual strategic plan as approved by the Board as well as the long-term growth and profitability of the Company, all of which are intended to enhance shareholder value. Below is information supporting the Board’s recommendation that shareholders approve on an advisory basis the compensation of the Company’s named executive officers for 2025.

Executive Compensation Highlights

Our executive compensation program is designed to help ensure that pay is aligned with our business objectives and the interests of our shareholders. Below are some of the key highlights of our executive compensation program.

2025 Financial and Operational Highlights

Proposal III: Ratification of KMPG as our Independent Registered Public Accounting Firm for 2026

KPMG was our independent registered public accounting firm for the year ended December 31, 2025. The Board recommends that shareholders ratify, on an advisory basis, the appointment of KPMG as our independent registered public accounting firm for the year ending December 31, 2026.

Proposal IV: Approval of the Dorman Products, Inc. 2026 Omnibus Incentive Plan

In March 2026, the Board approved and adopted, subject to shareholder approval, the Dorman Products, Inc. 2026 Omnibus Incentive Plan (the “2026 Omnibus Plan”) and reserved 1,543,000 shares of our common stock for issuance pursuant to awards to be granted under that plan during its ten year term. If approved by shareholders, the Company will have the ability to grant equity awards, including stock options, stock appreciation rights, restricted stock, restricted stock units, and cash awards to eligible plan participants to encourage share ownership, incentivize individual performance, and align that individual performance with the Company’s long-term objectives.

The Board adopted the 2026 Omnibus Plan to replace the Dorman Products, Inc. 2018 Stock Option and Stock Incentive Plan (the “2018 Equity Plan”). Upon the shareholder approval of the 2026 Omnibus Plan, no further awards will be granted under the 2018 Equity Plan. Shares remaining available for issuance and not subject to an outstanding award under the 2018 Equity Plan will be available for awards under the 2026 Omnibus Plan. In addition, if any award under the 2018 Equity Plan is forfeited, terminates or expires without having been exercised in full, the shares underlying such forfeited, terminated or expired award under the 2018 Equity Plan will be available for issuance under the 2026 Omnibus Plan. The material terms of the 2026 Omnibus Plan are summarized in this proxy statement, and a copy of the full text of the 2026 Omnibus Plan is attached to this proxy statement as Appendix B.

The Board recommends that shareholders approve the 2026 Omnibus Plan.

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