Custom Truck One Source (CTOS) 8-K Custom Truck One Source to Present at the Baird 51st Annual Global Industrial Conference

Exhibit 99.1

Custom Truck One Source to Present at the Baird 51st Annual Global Industrial Conference

KANSAS CITY, Mo., – November 4, 2021 – Custom Truck One Source, Inc. (NYSE: CTOS) today announced that Chief Executive Officer, Fred Ross, President and Chief Operating Officer, Ryan McMonagle, and Chief Financial Officer, Brad Meader will present at the Baird 51st Global Industrial Conference on Wednesday, November 10, 2021. The presentation is scheduled to begin at 4:55 p.m., Eastern Time.

ABOUT CUSTOM ONE TRUCK ONE SOURCE

Custom Truck One Source, Inc. is a leading provider of specialized truck and heavy equipment solutions to the utility, telecommunications, rail and infrastructure markets in North America. The Company’s solutions include rentals, sales, aftermarket parts, tools, accessories and service, equipment production, manufacturing, financing solutions, and asset disposal. With vast equipment breadth, the Company’s team of experts service its customers across an integrated network of locations across North America. For more information, please visit customtruck.com.

INVESTOR CONTACT

Brian Perman, Vice President, Investor Relations

844-403-6138

investors@customtruck.com