Material Agreement (Form 8-K)

Effective June 15, 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 Fourth Amendment to the Amended and Restated BMO Wholesale Financing and Security Agreement (the "Fourth 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, among RTC-Canada, BMO and the Company, as guarantor (the "RTC-Canada Floor Plan Credit Agreement"), as amended.

Pursuant to the terms of the Fourth Amendment, the RTC-Canada Floor Plan Credit Agreement was amended to increase the total loan commitment from $171.7 million CAD to $194.7 million CAD.

The foregoing description of the Fourth Amendment is qualified in its entirety by reference to the full text of the Fourth Amendment, which is attached as Exhibit 10.1 to this Current Report on Form 8-K and incorporated in this Item 1.01 by reference.