UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d)

of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): January 30, 2025

CUSTOM TRUCK ONE SOURCE, INC.

(Exact name of registrant as specified in its charter)

Delaware		001-38186		84-2531628
(State or other jurisdiction of incorporation)		(Commission File Number)		(IRS Employer Identification No.)

7701 Independence Avenue

Kansas City, Missouri

64125

(Address of principal executive offices)

(Zip Code)

(816) 241-4888

(Registrant’s telephone number, including area code)

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

	☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

	☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

	☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

	☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, $0.0001 par value		CTOS		New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01. Other Events.

On January 30, 2025, Custom Truck One Source, Inc. (the “Company”) purchased 8,143,635 shares of the Company’s common stock, par value $0.0001 per share (the “Common Stock”), from affiliates of Energy Capital Partners, at a purchase price of $4.00 per share, which represents an approximately 23% discount from the price of $5.19 per share of Common Stock at the close of trading on January 29, 2025, for an aggregate purchase price of $32,574,540.

The purchase of the shares of Common Stock was approved by the Company’s Board of Directors (the “Board”) and the Audit Committee of the Board, and the purchased shares will be held in treasury.

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Date: February 3, 2025	Custom Truck One Source, Inc.

	/s/ Christopher J. Eperjesy
	Christopher J. Eperjesy
	Chief Financial Officer