Exhibit 99.1 Dorman Products, Inc. Reports First Quarter 2026 Results and Reaffirms 2026 Guidance Highlights (All comparisons are to the prior year period unless otherwise noted): COLMAR, PA (May 4, 2026) – Dorman Products, Inc. (the "Company" or "Dorman") (NASDAQ: DORM), a leading supplier in the motor vehicle aftermarket industry, today announced its financial results for the first quarter ended March 28, 2026. Kevin Olsen, Dorman's Chairman, President, and Chief Executive Officer, stated, "We started the ...