Results of Operation and Financial Condition. On August 3, 2026, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the second fiscal quarter ended June 27, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on August 4, 2026 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Creation of a Direct Financial Obligation or an Obligation under an Off Balance Sheet Arrangement of a Registrant The information set forth in

Entry into a Material Definitive Agreement Notes Offering General On June 16, 2026, Dorman Products, Inc. (the “Company”) issued $450,000,000 aggregate principal amount of 6.250% senior notes due June 2034 (the “Notes”), pursuant to an indenture, dated as of June 16, 2026 (the “Indenture”), among the Company, the guarantors party thereto, and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). The Notes pay interest semi-annually on June 15 and December 15, commencing o…

Other Events. On June 2, 2026, Dorman Products, Inc. (the “Company”) entered into a purchase agreement (the “Purchase Agreement”), by and among the Company, the guarantors party thereto and BofA Securities, Inc., as representative of the several initial purchasers listed therein (the “Initial Purchasers”), providing for the issuance and sale of $450 million aggregate principal amount of the Company’s 6.250% Senior Notes due 2034 (the “Notes”) in a private transaction in reliance upon an exemp…

Results of Operation and Financial Condition. On May 4, 2026, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the first fiscal quarter ended March 28, 2026. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on May 5, 2026 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Results of Operation and Financial Condition On February 25, 2026, Dorman Products, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and full year ended December 31, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on February 26, 2026 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Web…

CFO — Charles W. Rayfield: The filing announces the external hire of a new CFO designate, which is a standard succession event rather than a sudden loss of an executive.

Results of Operation and Financial Condition. On October 27, 2025, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the third fiscal quarter ended September 27, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on October 28, 2025 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Results of Operation and Financial Condition. On August 4, 2025, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the second fiscal quarter ended June 28, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on August 5, 2025 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

CFO — David M. Hession: The CFO is retiring with a planned transition and search process, representing an orderly succession rather than a sudden loss.

Chief Accounting Officer — Gregory Bowen: The filing discloses the internal promotion of the existing Vice President and Controller to the role of Chief Accounting Officer, which is a succession event rather than a departure.

Results of Operation and Financial Condition. On May 5, 2025, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the first fiscal quarter ended March 29, 2025. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on May 6, 2025 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Results of Operation and Financial Condition On February 26, 2025 , Dorman Products, Inc. (the “Company”) issued a press release announcing its financial results for the fourth quarter and full year ended December 31, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on February 27, 2025 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and We…

Other Events. On October 29, 2024, the Company’s Board of Directors approved a new share repurchase program with an aggregate authorization to repurchase up to $500 million of the Company’s common stock (the “New Program”). The New Program is effective January 1, 2025 and will expire December 31, 2027. The Company’s existing share repurchase program will expire December 31, 2024, along with all unused amounts under that program as of that date. Once it becomes effective, share repurchases und…

Results of Operation and Financial Condition. On October 31, 2024, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the third fiscal quarter ended September 28, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on November 1, 2024 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Results of Operation and Financial Condition On August 1, 2024, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the second fiscal quarter ended June 29, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on August 2, 2024 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).

Results of Operation and Financial Condition On May 7, 2024, Dorman Products, Inc. (the “Company”) issued a press release announcing its operating results for the first fiscal quarter ended March 30, 2024. A copy of the press release is attached hereto as Exhibit 99.1 and incorporated by reference herein. The Company will hold a conference call and webcast on May 7, 2024 (see information in the press release attached hereto as Exhibit 99.1 under “Conference Call and Webcast”).