Dorman Products, Inc. 10-Q

ITEM 5. Other Information Director and Executive Officer Trading Arrangements Entry into Rule 10b5-1 Trading Plans. During the quarter ended March 28, 2026, none of our directors or officers (as defined under Rule 16b-1(f) of the Exchange Act) adopted or terminated any contract, instruction or written plan for the purchase or sale of securities that was intended to satisfy 24 Table of Contents the affirmative defense conditions of Rule 10b5-1(c) under the Exchange Act (each, a “Rule 10b5-1 Plan”). Termination of Rule 10b5-1 Trading Plans. No director or officer terminated a Rule 10b5-1 Plan during the quarter ended March 28, 2026. Non-Rule 10b5-1 Trading Plans. There were no non-Rule 10b5-1 trading arrangements entered into or terminated by our directors and officers during the quarter ended March 28, 2026. ITEM 6. Exhibits (a) Exhibits The Exhibits included in this report are listed in the Exhibit Index on page 25 , which is incorporated herein by reference. EXHIBIT INDEX 31.1 Certification of Chief Executive Officer pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. * 31.2 Certification of Chief Financial Officer pursuant to Rule 13a-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002. * 32 Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished with this report). ** 101 The following financial statements from the Dorman Products, Inc. Quarterly Report on Form 10-Q as of and for the quarter ended March 28, 2026, formatted in Inline XBRL (eXtensible Business Reporting Language): (i) the Condensed Consolidated Statements of Operations and Comprehensive Income; (ii) the Condensed Consolidated Balance Sheets; (iii) Condensed Consolidated Statements of Shareholders’ Equity; (iv) the Condensed Consolidated Statements of Cash Flows and (v) the Notes to Condensed Consolidated Financial Statements. 104 The cover page from the Company’s Quarterly Report on Form 10-Q as of and for the quarter ended March 28, 2026, formatted in Inline XBRL (included as Exhibit 101). * Filed herewith ** Furnished herewith 25 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. Dorman Products, Inc. May 4, 2026 /s/ Kevin M. Olsen Kevin M. Olsen President and Chief Executive Officer (principal executive officer) May 4, 2026 /s/ Charles W. Rayfield Charles W. Rayfield Senior Vice President, Chief Financial Officer and Treasurer (principal financial officer) 26