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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549  
Form 8-K/A
(Amendment No. 1)  
CURRENT REPORT
Pursuant to Section 13 or 15(d)
of the Securities Exchange Act of 1934
Date of Report (Date of earliest event Reported): April 1, 2021
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 ClassTrading Symbol(s)Name of Exchange on Which Registered
Common Stock, $0.0001 par valueCTOSNew York Stock Exchange
Redeemable warrants, exercisable for Common Stock, $0.0001 par valueCTOS.WTNew 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. ☐



Explanatory Note
As previously reported in a Current Report on Form 8-K filed on April 2, 2021 (the “Initial Form 8-K”), on April 1, 2021, Custom Truck One Source, Inc. (formerly Nesco Holdings, Inc.) (the “Company”) completed its acquisition (the “Acquisition”) of 100% of the partnership interests of Custom Truck One Source, L.P. (“Custom Truck”). This Amendment No. 1 to Current Report on Form 8-K (“Amendment No. 1”) is being filed to amend and supplement the Initial Form 8-K to include the financial statements and pro forma financial information required by Items 9.01(a) and 9.01(b) of Form 8-K and should be read in conjunction with the Initial Form 8-K.
The pro forma financial information included in this Amendment No. 1 has been presented for informational purposes only, as required by Form 8-K. It does not purport to represent the actual results of operations that the Company and Custom Truck would have achieved had the companies been combined during the periods presented in the pro forma financial information and is not intended to project the future results of operations that the combined company may achieve after the Acquisition.
Item 9.01    Financial Statements and Exhibits.
(a)     Financial Statements of Businesses Acquired
The audited consolidated balance sheets of Custom Truck and subsidiaries as of December 31, 2020 and 2019, the consolidated statements of income, partners' equity and cash flows for each of the years in the three-year period ended December 31, 2020, and the related notes are filed herewith as Exhibit 99.1.
(b)     Pro Forma Financial Information
The unaudited pro forma condensed combined balance sheet as of December 31, 2020, the unaudited pro forma condensed combined statement of operations for the year ended December 31, 2020, and the notes to unaudited pro forma condensed combined financial information, all giving effect to the Acquisition, are filed herewith as Exhibit 99.2.
(d)    Exhibits
Exhibit No.Description
99.1
99.2
104Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)



SIGNATURES

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:May 5, 2021Custom Truck One Source, Inc.
   
/s/ Bradley Meader
  Bradley Meader
Chief Financial Officer