Custom Truck One Source, Inc. - Officer Departure

R. Todd Barrett has resigned as the Chief Accounting Officer of Custom Truck One Source, Inc., effective January 16, 2026. His resignation is not due to any disagreements regarding the Company's operations, policies, or practices. Christopher J. Eperjesy, the Chief Financial Officer, signed the report on behalf of the company. The filing is a Form 8-K, reporting a current event.