Custom Truck One Source Publishes Inaugural ESG Report

Custom Truck One Source, Inc. (“Custom Truck One Source,” “we,” “us,” or the “Company”) (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today released its Inaugural Environmental, Social, and Governance (“ESG”) Report. The report outlines the various initiatives and achievements the Company has made in the areas of environmental stewardship, social responsibility, and corporate governance.

“We’ve experienced tremendous change over the past two years, including the formalization of the combined Company’s ESG process. Holding ourselves accountable for our practices and to our stakeholders, we not only demonstrate our resolve to being a responsible corporate citizen but are better positioned to advance the Company’s goals as well,” said Ryan McMonagle, CEO of Custom Truck One Source. “This report marks the first of many to come as we commit to doing more today, tomorrow, and into the future.”

With collaboration from teams across the Company, Custom Truck One Source’s report details the company-wide ESG opportunities, risks, and priorities that are particularly relevant to the Company and its stakeholders. These include:

• Environmental Compliance
• Sustainable Operations
• Environmental Benefits of Products and Services
• Human Capital Management
• Diversity, Equity and Inclusion
• Employee Health and Safety
• Enterprise Risk Management
• Business Ethics
• Data Privacy and Security
• Corporate Governance

Custom Truck One Source’s Inaugural ESG Report is available under the “Governance” tab on the Company’s investor relations website investors.customtruck.com.

ABOUT CUSTOM TRUCK ONE SOURCE

Custom Truck One Source is one of the largest providers of specialty equipment, parts, tools, accessories and services to the electric utility transmission and distribution, telecommunications and rail markets in North America, with a differentiated “one-stop-shop” business model. The Company offers its specialized equipment to a diverse customer base for the maintenance, repair, upgrade and installation of critical infrastructure assets, including electric lines, telecommunications networks and rail systems. The Company's coast-to-coast rental fleet of more than 10,100 units includes aerial devices, boom trucks, cranes, digger derricks, pressure drills, stringing gear, hi-rail equipment, repair parts, tools and accessories. For more information, please visit customtruck.com.

FORWARD-LOOKING STATEMENTS

This press release includes “forward-looking statements” within the meaning of the “safe harbor” provisions of the United States Private Securities Litigation Reform Act of 1995, as amended, and within the meaning of Section 21E of the Securities Exchange Act of 1934, as amended, and Section 27A of the Securities Act of 1933, as amended. When used in this press release, the words “estimates,” “projected,” “expects,” “anticipates,” “forecasts,” “plans,” “intends,” “believes,” “seeks,” “may,” “will,” “should,” “future,” “propose” and variations of these words or similar expressions (or the negative versions of such words or expressions) are intended to identify forward-looking statements. These forward-looking statements are not guarantees of future performance, conditions or results, and involve a number of known and unknown risks, uncertainties, assumptions and other important factors, many of which are outside the Company's management’s control, that could cause actual results or outcomes to differ materially from those discussed in this press release. This press release is based on certain assumptions that the Company's management has made in light of its experience in the industry, as well as the Company’s perceptions of historical trends, current conditions, expected future developments and other factors the Company believes are appropriate in these circumstances. As you read and consider this press release, you should understand that these statements are not guarantees of performance or results. Many factors could affect the Company’s actual performance and results and could cause actual results to differ materially from those expressed in this press release. Important factors, among others, that may affect actual results or outcomes include: increases in labor costs, our inability to obtain raw materials, component parts and/or finished goods in a timely and cost-effective manner, and our inability to manage our rental equipment in an effective manner; our sales order backlog may not be indicative of the level of our future revenues; increases in unionization rate in our workforce; our inability to recruit and retain the experienced personnel, including skilled technicians, we need to compete in our industries; our inability to attract and retain highly skilled personnel and our inability to retain our senior management; material disruptions to our operation and manufacturing locations as a result of public health concerns, equipment failures, natural disasters, work stoppages, power outages or other reasons; potential impairment charges; any further increase in the cost of new equipment that we purchase for use in our rental fleet or for sale as inventory; aging or obsolescence of our existing equipment, and the fluctuations of market value thereof; disruptions in our supply chain; our business may be impacted by government spending; we may experience losses in excess of our recorded reserves for receivables; unfavorable conditions in the capital and credit markets and our inability to obtain additional capital as required; increases in price of fuel or freight; regulatory technological advancement, or other changes in our core end-markets may affect our customers’ spending; difficulty in integrating acquired businesses and fully realizing the anticipated benefits and cost savings of the acquired businesses, as well as additional transaction and transition costs that we will continue to incur following acquisitions; material weakness in our internal control over financial reporting which, if not remediated, could result in material misstatements in our financial statements; the interest of our majority stockholder, which may not be consistent with the other stockholders; our significant indebtedness, which may adversely affect our financial position, limit our available cash and our access to additional capital, prevent us from growing our business and increase our risk of default; our inability to generate cash, which could lead to a default; significant operating and financial restrictions imposed by our debt agreements; changes in interest rates, which could increase our debt service obligations on the variable rate indebtedness and decrease our net income and cash flows; disruptions in our information technology systems or a compromise of our system security, limiting our ability to effectively monitor and control our operations, adjust to changing market conditions, and implement strategic initiatives; we are subject to complex laws and regulations, including environmental and safety regulations that can adversely affect cost, manner or feasibility of doing business; we are subject to a series of risks related to climate change; and increased attention to, and evolving expectations for, sustainability and environmental, social and governance initiatives. For a more complete description of these and other possible risks and uncertainties, please refer to the Company's Annual Report on Form 10-K for the year ended December 31, 2022, and its subsequent reports filed with the Securities and Exchange Commission. All forward-looking statements attributable to the Company or persons acting on its behalf are expressly qualified in their entirety by the foregoing cautionary statements.

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