Custom Truck One Source 3rd Quarter 2023 Investor Presentation November 7, 2023 CONFIDENTIAL DRAFT1 Safe Harbor This presentation includes certain financial measures that have not been prepared in a manner that complies with generally accepted accounting principles in the United States (“GAAP”), including, without limitation, Adjusted Gross Profit, Adjusted Gross Margin, EBITDA, Adjusted EBITDA and Pro Forma Adjusted EBITDA (collectively, the “non-GAAP financial measures”). These non-GAAP financial measures ...