Entry into a Material Definitive Agreement. Second Amendment to the BMO Revolving Lease and Rental Credit Agreement Effective August 4, 2026, Rush Truck Centres of Canada Limited (“RTC-Canada”), a subsidiary of Rush Enterprises, Inc. (the “Company”), and the Company, as guarantor, entered into the Second Amendment to the BMO Revolving Lease and Rental Credit Agreement (the “Second BMO Revolving Lease and Rental Credit Agreement Amendment”) with Bank of Montreal (“BMO”), which amended that cer…

Regulation FD Disclosure. The Earnings Press Release also announced that the Company’s Board of Directors declared a three-for-two stock split with respect to both the Company’s Class A and Class B common stock. The stock split will be effected in the form of a stock dividend payable on August 31, 2026, to stockholders of record as of August 11, 2026. Holders of the Company’s common stock will receive an additional one-half share for each share of common stock held as of the record date. In a…

Results of Operations and Financial Condition. On July 28, 2026, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its second quarter ended June 30, 2026 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Other Events. On July 23, 2026, Rush Enterprises, Inc. (the “Company”) issued a press release announcing that it has entered into an agreement with MCT Companies, one of the largest Carrier Transicold dealers in the United States, to form a new joint venture entity that will operate MCT Companies’ network of 17 truck, trailer and rail refrigeration and auxiliary power unit dealerships and 3 mobile service locations in California, Nebraska, Kansas, North Carolina, South Carolina and Virginia.…

The filing details new base salaries for existing named executive officers.

Results of Operations and Financial Condition. On April 28, 2026, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its first quarter ended March 31, 2026 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

COO — Jody Pollard: Mr. Pollard was promoted to Chief Operating Officer from his previous role as Senior Vice President – Truck and Aftermarket Sales.

COO — Jason Wilder: Jason Wilder resigned as COO to pursue other opportunities.

The filing details compensation and equity awards to existing executives, not a management change.

Results of Operations and Financial Condition. On February 17, 2026, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its fiscal fourth quarter ended December 31, 2025, and for the full year 2025 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Other Events. On December 3, 2025, the Company issued a press release announcing that the Company’s Board of Directors approved a new stock repurchase program authorizing the Company to repurchase up to an aggregate of $150 million of Class A common stock and/or Class B common stock. The new stock repurchase program became effective on December 3, 2025, and replaced the Company’s previous stock repurchase program that was terminated effective December 2, 2025. A copy of the press release anno…

Material Modification to Rights of Security Holders. Item 3.03(a) The information set forth under

Results of Operations and Financial Condition. On October 29, 2025, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its third quarter ended September 30, 2025 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Entry into a Material Definitive Agreement. Effective September 30, 2025, Rush Enterprises, Inc. (the “Company”) and certain of its subsidiaries (the Company and such subsidiaries collectively, “Rush”) entered into the Fourth Amendment to Credit Agreement (the “Fourth Amendment”) with each of the lenders party thereto (the “Lenders”) and Wells Fargo Bank, N.A., as Administrative Agent (the “Administrative Agent”), which amended that certain Credit Agreement, dated as of September 14, 2021, am…

Results of Operations and Financial Condition. On July 30, 2025, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its second quarter ended June 30, 2025 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

CEO — W.M. “Rusty” Rush: The filing discloses a routine annual base salary adjustment for existing executives, not a change in personnel or management structure.

Entry into a Material Definitive Agreement. Effective June 13, 2025, Rush Truck Centres of Canada Limited (“RTC-Canada”), a subsidiary of Rush Enterprises, Inc. (the “Company”), and the Company, as guarantor, entered into the Third Amendment to the Amended and Restated BMO Wholesale Financing and Security Agreement (the “Third Amendment”) with Bank of Montreal (“BMO”), which amended that certain Amended and Restated BMO Wholesale Financing and Security Agreement, dated as of July 15, 2022, am…

Other Events. On May 29, 2025, Rush Enterprises, Inc. (the “Company”) issued a press release announcing that the Company’s Board of Directors approved an increase of $50 million to its existing stock repurchase program authorizing the Company to repurchase up to an aggregate of $200 million of its shares of Class A common stock, $.01 par value per share, and/or Class B common stock, $.01 par value per share. A copy of the press release is attached to this report as Exhibit 99.1 and is incorpo…

Results of Operations and Financial Condition. On April 30, 2025, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its first quarter ended March 31, 2025 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

CEO — W. M. “Rusty” Rush: The filing discises the approval of annual cash bonuses and equity grants for executive officers, which is a compensatory arrangement rather than a change in management personnel.

Results of Operations and Financial Condition. On February 18, 2025, Rush Enterprises, Inc. (the “Company”) issued a press release announcing the Company’s financial results for its fiscal fourth quarter ended December 31, 2024, and for the full year 2024 (the “Earnings Press Release”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant. The information described in

by reference. Peterbilt Inventory Finance Agreement On December 16, 2024, Rush and certain of its subsidiaries that operate Peterbilt commercial vehicle dealerships (such subsidiaries collectively referred to as, “ Rush Peterbilt Truck Centers ”), entered into that certain Inventory Financing and Purchase Money Security Agreement (the “ Peterbilt Inventory Finance Agreement ”) with PFC. Pursuant to the terms of the Peterbilt Inventory Finance Agreement, PFC agreed to make up to $800.0 million…

Other Events. On December 3, 2024, the Company issued a press release announcing that the Company’s Board of Directors approved a new stock repurchase program authorizing the Company to repurchase up to an aggregate of $150 million of Class A common stock and/or Class B common stock. The new stock repurchase program became effective on December 3, 2024, and replaced the Company’s previous $150 million stock repurchase program that was terminated effective December 2, 2024. A copy of the press…

Results of Operations and Financial Condition. On October 29, 2024, Rush Enterprises, Inc. (the “ Company ”) issued a press release announcing the Company’s financial results for its third quarter ended September 30, 2024 (the “ Earnings Press Release ”). A copy of the Earnings Press Release is attached hereto as Exhibit 99.1 and is incorporated herein by reference.