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): ~~July~~October 3027, 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 (17CFR 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 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 2.02. Results of Operations and Financial Condition.

On ~~July~~October 3027, 2025, Custom Truck One Source, Inc. (the "Company") issued a press release announcing its financial results for the quarter ended ~~June~~September 30, 2025. The press release is being furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

The information in this Item 2.02, including Exhibit 99.1, shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any of the Company's filings under the Securities Act of 1933, as amended (the "Securities Act"), or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

Item 7.01. Regulation FD Disclosure.

On ~~July~~October 3027, 2025, the Company posted an updated investor presentation on its website at www.customtruck.com.

The information in this Item 7.01 shall be deemed "furnished" and not "filed" for purposes of Section 18 of the Exchange Act, or otherwise subject to the liabilities of that section, and shall not be deemed to be incorporated by reference into any of the Company's filings under the Securities Act or the Exchange Act, whether made before or after the date hereof and regardless of any general incorporation language in such filings, except to the extent expressly set forth by specific reference in such a filing.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.


Exhibit No.						Description
99.1						Press release of Custom Truck One Source, Inc.
104						Cover Page Interactive Data File (embedded within the Inline XBRL document and contained in Exhibit 101)

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:	~~July~~October 3027, 2025	Custom Truck One Source, Inc.
		/s/ Christopher J. Eperjesy
		Christopher J. EperjesyChief Financial Officer

Filing Compare · Custom Truck One Source, Inc.