CTOS.WS / Custom Truck One Source, Inc. - Equity Warrant - SEC फाइलिंग, वार्षिक रिपोर्ट, प्रॉक्सी स्टेटमेंट

Form of 2025 Restricted Stock Unit Agreement

Exhibit 10.6 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Restricted Stock Unit Grant Notice (the “Grant Notice”) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the “Plan”) of Custom Truck One Source, Inc. (f

Custom Truck One Source, Inc. Reports Second Quarter 2025 Results and Reaffirms 2025 Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Second Quarter 2025 Results and Reaffirms 2025 Guidance KANSAS CITY, Mo. July 30, 2025 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for the th

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM

Amendment No. 1 to Form of Restricted Stock Unit Agreement

Exhibit 10.7 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN AMENDMENT NO. 1 TO RESTRICTED STOCK UNIT GRANT NOTICE AND RESTRICTED STOCK UNIT AGREEMENT WHEREAS, capitalized terms not specifically defined in this Amendment No. 1 to Restricted Stock Unit Grant Notice and Restricted Stock Unit Agreement (the “Amendment”) have the meanings given to them in the Amended and

Form of 2025 Performance Stock Unit Agreement

Exhibit 10.8 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Performance Stock Unit Grant Notice (the “Grant Notice”) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the “Plan”) of Custom Truck One Source, Inc.

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 30, 2025 CUSTOM TRUCK ONE SO

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 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) (Commis

Amendment No. 1 to Form of Performance Stock Unit Agreement

Exhibit 10.10 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN AMENDMENT NO. 1 TO PERFORMANCE STOCK UNIT GRANT NOTICE AND PERFORMANCE STOCK UNIT AGREEMENT WHEREAS, capitalized terms not specifically defined in this Amendment No. 1 to Performance Stock Unit Grant Notice and Performance Stock Unit Agreement (the “Amendment”) have the meanings given to them in the Amende

Form of 2025 Corporate Milestones Performance Stock Unit Agreement

Exhibit 10.9 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Performance Stock Unit Grant Notice (the “Grant Notice”) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the “Plan”) of Custom Truck One Source, Inc.

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): June 12, 2025 CUSTOM TRUCK ONE SO

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): June 12, 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) (Commis

Retention Bonus Letter Agreement, by and between Ryan McMonagle and Custom Truck One Source, Inc., dated April 28, 2025

Exhibit 10.1 April 28, 2025 Ryan McMonagle 7701 Independence Ave. Kansas City, MO 64125 Re: Retention Bonus Dear Ryan: On behalf of Custom Truck One Source, Inc. (the “Company”), we are pleased to offer you the opportunity to receive a cash retention bonus as set forth in this letter agreement (the “Agreement”). In the event that you remain continuously employed by the Company (or its applicable s

Retention Bonus Letter Agreement, by and between Joseph Ross and Custom Truck One Source, Inc., dated April 28, 2025

Exhibit 10.3 April 28, 2025 Joseph Ross 7701 Independence Ave. Kansas City, MO 64125 Re: Retention Bonus Dear Joe: On behalf of Custom Truck One Source, Inc. (the “Company”), we are pleased to offer you the opportunity to receive a cash retention bonus as set forth in this letter agreement (the “Agreement”). In the event that you remain continuously employed by the Company (or its applicable subsi

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 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) (Commi

Retention Bonus Letter Agreement, by and between Christopher Eperjesy and Custom Truck One Source, Inc., dated April 28, 2025

Exhibit 10.2 April 28, 2025 Chris Eperjesy 7701 Independence Ave. Kansas City, MO 64125 Re: Retention Bonus Dear Chris: On behalf of Custom Truck One Source, Inc. (the “Company”), we are pleased to offer you the opportunity to receive a cash retention bonus as set forth in this letter agreement (the “Agreement”). In the event that you remain continuously employed by the Company (or its applicable

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTO

Custom Truck One Source, Inc. Reports First Quarter 2025 Results and Reaffirms 2025 Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports First Quarter 2025 Results and Reaffirms 2025 Guidance KANSAS CITY, Mo. April 30, 2025 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for the th

Retention Bonus Letter Agreement, by and between Thomas Rich and Custom Truck One Source, Inc., dated April 28, 2025

Exhibit 10.4 April 28, 2025 Thomas Rich 7701 Independence Ave. Kansas City, MO 64125 Re: Retention Bonus Dear Thomas: On behalf of Custom Truck One Source, Inc. (the “Company”), we are pleased to offer you the opportunity to receive a cash retention bonus as set forth in this letter agreement (the “Agreement”). In the event that you remain continuously employed by the Company (or its applicable su

Retention Bonus Letter Agreement, by and between Paul Jolas and Custom Truck One Source, Inc., dated April 28, 2025

Exhibit 10.5 April 28, 2025 Paul Jolas 7200 Jack Newell Blvd. South Fort Work, TX 76118 Re: Retention Bonus Dear Paul: On behalf of Custom Truck One Source, Inc. (the “Company”), we are pleased to offer you the opportunity to receive a cash retention bonus as set forth in this letter agreement (the “Agreement”). In the event that you remain continuously employed by the Company (or its applicable s

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM TRU

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): March 04, 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) (Commi

Insider Trading Policy

Exhibit 19.1 CUSTOM TRUCK ONE SOURCE, INC. INSIDER TRADING POLICY (Effective April 1, 2021) Federal and state laws prohibit trading in the securities of a company while in possession of material nonpublic information and providing material nonpublic information to others so that they can trade. Violating such laws can undermine investor trust, harm our reputation, and result in your dismissal or e

Custom Truck One Source, Inc. Reports Fourth Quarter and Full-Year 2024 Results

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Fourth Quarter and Full-Year 2024 Results KANSAS CITY, Mo. March 4, 2025 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for the fourth quarter and full year ended December

Description of the Registrant’s Securities Registered under Section 12 of the Exchange Act

Exhibit 4.3 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description sets forth certain material terms and provisions of the securities of Custom Truck One Source, Inc. (the “Company,” “we,” “us” or “our”) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The following descriptio

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware CTOS Blocker GP I L.L.C. Delaware CTOS Blocker GP II L.L.C. Delaware CTOS Blocker I, L.P. Delaware

Other Events

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) (Com

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 December 12, 2024 VIA EDGAR CORRESPONDENCE Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

CTOS / Custom Truck One Source, Inc. / ECP ControlCo, LLC Activist Investment

SC 13D/A 1 formsc13da.htm United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 6)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Secu

Custom Truck One Source, Inc. Reports Third Quarter 2024 Results and Updates Full-Year Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Third Quarter 2024 Results and Updates Full-Year Guidance KANSAS CITY, Mo, October 30, 2024 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for t

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 ☐ TRANSITION REPORT PURSUANT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 C

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): October 30, 2024 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) (Com

CTOS / Custom Truck One Source, Inc. / ECP ControlCo, LLC Activist Investment

SC 13D/A 1 formsc13da.htm United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 5)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Secu

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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): AUGUST 15, 2024 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) (Comm

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 August 16, 2024 VIA EDGAR CORRESPONDENCE Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

Amendment No. 3 to Revolving Credit Agreement, dated as of August 9, 2024, by and among Capitol Investment Merger Sub 2, LLC, NESCO Holdings II, Inc., certain other credit parties party thereto, the lenders and other financial institutions party thereto and Bank of America, N.A., as administrative agent and collateral agent (Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K filed on August 12, 2024).

Exhibit 10.1 AMENDMENT NO. 3 TO REVOLVING CREDIT AGREEMENT AMENDMENT NO. 3 to the REVOLVING CREDIT AGREEMENT, dated as of August 9, 2024 (this “Amendment”), among CAPITOL INVESTMENT MERGER SUB 2, LLC, a Delaware limited liability company (“Holdings”), NESCO HOLDINGS II, INC., a Delaware corporation (the “Borrower”), each of the other Credit Parties party hereto, BANK OF AMERICA, N.A., as administr

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): August 9, 2024 CUSTOM TRUCK ONE S

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): August 9, 2024 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) (Commi

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 August 2, 2024 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM

Custom Truck One Source, Inc. Reports Second Quarter 2024 Results and Updates Full-Year Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Second Quarter 2024 Results and Updates Full-Year Guidance KANSAS CITY, Mo, August 1, 2024 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for it

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): August 1, 2024 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) (Commi

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 June 25, 2024 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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): JUNE 13, 2024 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) (Commis

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 June 10, 2024 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM S-8 REGISTRATION STATEMENT THE SECURITIES ACT OF 1933 CUSTOM TRUCK ONE SOURCE, INC. (Exact name of registrant as specified in its charter) Delaware 84-2531628 (State or other

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CUSTOM TRUCK ONE SOURCE, INC.

Filing Fee Table

EXHIBIT 107 Calculation of Filing Fee Table FORM S-8 (Form Type) CUSTOM TRUCK ONE SOURCE, INC.

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): May 2, 2024 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) (Commissi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTO

Custom Truck One Source, Inc. Reports First Quarter 2024 and Updates Full-Year Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports First Quarter 2024 and Updates Full-Year Guidance KANSAS CITY, Mo, May 2, 2024 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, forestry, waste management and other infrastructure-related end markets, today reported financial results for its three mont

Amendment to Employment Agreement, dated April 26, 2024, by and between Ryan McMonagle and Custom Truck One Source, Inc.

Exhibit 10.1 Amendment to Chief Executive Officer Employment Agreement On April 26, 2024, our Board of Directors approved an amendment to Ryan McMonagle’s employment agreement to increase Mr. McMonagle’s target bonus opportunity from 50% of his annual base salary to 100% of his annual base salary. All other terms of Mr. McMonagle’s existing employment agreement remain unchanged.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No.) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defini

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

EX-99.25

NOTIFICATION OF THE REMOVAL FROM LISTING AND REGISTRATION OF THE STATED SECURITIES The New York Stock Exchange ("NYSE" or the "Exchange") hereby notifies the Securities and Exchange Commission (the "Commission") of its intention to remove the entire class of redeemable warrants, exercisable for common stock (the "Warrants") of Custom Truck One Source, Inc.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing

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): March 15, 2024 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) (Commi

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 March 14, 2024 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

Other Events

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): March 11, 2024 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) (Commi

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): March 07, 2024 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) (Commi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM TRU

Custom Truck One Source, Inc. Reports Record Results for Full-Year 2023

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Record Results for Full-Year 2023 KANSAS CITY, Mo, March 7, 2024 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for the fourth quarter and full year ended December 31, 202

Policy for Recovery of Erroneously Awarded Compensation

Exhibit 97.1 CUSTOM TRUCK ONE SOURCE, INC. POLICY FOR RECOVERY OF ERRONEOUSLY AWARDED COMPENSATION Custom Truck One Source, Inc. (the “Company”) has adopted this Policy for Recovery of Erroneously Awarded Compensation (the “Policy”), effective as of October 2, 2023 (the “Effective Date”). Capitalized terms used in this Policy but not otherwise defined herein are defined in Section 11. 1.Persons Su

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware CTOS Blocker GP I L.L.C. Delaware CTOS Blocker GP II L.L.C. Delaware CTOS Blocker I, L.P. Delaware

Description of the Registrant’s Securities Registered under Section 12 of the Exchange Act

Exhibit 4.3 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description sets forth certain material terms and provisions of the securities of Custom Truck One Source, Inc. (the “Company,” “we,” “us” or “our”) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The following descriptio

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 February 27, 2024 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 December 15, 2023 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

7701 Independence Avenue Kansas City, Missouri 64125

7701 Independence Avenue Kansas City, Missouri 64125 November 8, 2023 VIA EDGAR CORRESPONDENCE Tony Watson Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): November 7, 2023 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) (Com

Custom Truck One Source, Inc. Reports Strong Results for Third Quarter 2023 and Affirms Full-Year 2023 EBITDA Guidance

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Strong Results for Third Quarter 2023 and Affirms Full-Year 2023 EBITDA Guidance KANSAS CITY, Mo, November 7, 2023 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for its th

Employment Agreement, by and between the Company and Paul M. Jolas, dated August 2, 2023 (Incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 001-38186) filed on November 7, 2023)

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this “Agreement”) is made and entered into as of August 2, 2023 and effective as of July 31, 2023 (the “Effective Date”), by and between Custom Truck One Source, Inc. (the “Company”), and Paul M. Jolas (“Executive”). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive un

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPORT PURSUANT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 C

Other Events

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): September 14, 2023 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) (C

Amendment No. 2 to Revolving Credit Agreement, dated as of March 27, 2023, by and among Capitol Investment Merger Sub 2, LLC, NESCO Holdings II, Inc., the lenders party thereto and Bank of America, N.A., as administrative agent and collateral agent (Incorporated by reference to Exhibit 10.3 of the Company’s Quarterly Report on Form 10-Q filed on August 8, 2023)

Exhibit 10.3 EXECUTION VERSION AMENDMENT NO. 2 TO REVOLVING CREDIT AGREEMENT This AMENDMENT NO. 2 (this “Amendment”), dated as of March 27, 2023, to the ABL Credit Agreement (as defined below), is entered into by and among CAPITOL INVESTMENT MERGER SUB 2, LLC, a Delaware limited liability company (“Holdings”), NESCO HOLDINGS II, INC., a Delaware corporation (the “Borrower”), BANK OF AMERICA, N.A.,

Amendment No. 1 to Revolving Credit Agreement and U.S. ABL Security Agreement, dated as of July 1, 2021, by and among Capitol Investment Merger Sub 2, LLC, NESCO Holdings II, Inc., the other grantors party thereto, the lenders party thereto and Bank of America, N.A., as administrative agent and collateral agent (Incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q filed on August 8, 2023)

Exhibit 10.2 Execution Version AMENDMENT NO. 1 TO REVOLVING CREDIT AGREEMENT AND U.S. ABL SECURITY AGREEMENT This AMENDMENT NO. 1 (this “Amendment”), dated as of July 1, 2021, to the ABL Credit Agreement and the U.S. ABL Security Agreement (each as defined below), is entered into by and among CAPITOL INVESTMENT MERGER SUB 2, LLC, a Delaware limited liability company (“Holdings”), NESCO HOLDINGS II

Custom Truck One Source, Inc. Reports Continued Strong Results for Second Quarter 2023

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Continued Strong Results for Second Quarter 2023 KANSAS CITY, Mo, August 8, 2023 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for its three and six months ended June 30,

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): August 8, 2023 CUSTOM TRUCK ONE S

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): August 8, 2023 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) (Commi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM

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): June 15, 2023 CUSTOM TRUCK ONE SO

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): June 15, 2023 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) (Commis

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): May 9, 2023 CUSTOM TRUCK ONE SOUR

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): May 9, 2023 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) (Commissi

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTO

Custom Truck One Source, Inc. Reports Continued Strong Results for First Quarter 2023

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Continued Strong Results for First Quarter 2023 KANSAS CITY, Mo, May 9, 2023 – (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for its first quarter ended March 31, 2023. CTOS

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) x Defin

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: x Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) o Defin

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): April 14, 2023 CUSTOM TRUCK ONE S

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): April 14, 2023 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) (Commi

Second Amended and Restated Stockholders’ Agreement, dated as of April 14, 2023, among Custom Truck One Source, Inc. and certain holders identified therein (Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K (File No. 001-38186) filed on April 14, 2023).

Exhibit 10.1 SeCOND AMENDED AND RESTATED STOCKHOLDERS’ AGREEMENT of CUSTOM TRUCK ONE SOURCE, INC. Dated as of April 14, 2023 TABLE OF CONTENTS ARTICLE I CORPORATE GOVERNANCE 2 Section 1.1 Board of Directors Composition 2 Section 1.2 Committees; Subsidiary Boards 6 Section 1.3 Operating Council 6 Section 1.4 Board Quorum and Action by Written Consent 7 Section 1.5 Special Meetings of the Board 7 Se

Custom Truck One Source, Inc. Reports Record Results for the Fourth-Quarter and Full-Year 2022

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Record Results for the Fourth-Quarter and Full-Year 2022 KANSAS CITY, Mo, March 14, 2023 (BUSINESS WIRE) – Custom Truck One Source, Inc. (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for the fourth quarter and full year

Description of the Registrant’s Securities Registered under Section 12 of the Exchange Act

Exhibit 4.3 DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description sets forth certain material terms and provisions of the securities of Custom Truck One Source, Inc. (the “Company,” “we,” “us” or “our”) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The following descriptio

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware NESCO El Alquiler S. de R.L. de C.V. Mexico CTOS Blocker GP I L.L.C. Delaware CTOS Blocker GP II L

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM TRU

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): March 14, 2023 CUSTOM TRUCK ONE S

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): March 14, 2023 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) (Commi

CTOS / Custom Truck One Source, Inc. / ECP ControlCo, LLC - SC 13D/A NO. 4 Activist Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to ? 240.13d-1(a) and Amendments Thereto Filed Pursuant to ? 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 4)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 64083J104 (CUSIP N

Custom Truck One Source Announces CEO Transition Plan

Exhibit 99.1 Custom Truck One Source Announces CEO Transition Plan KANSAS CITY, Mo., Dec. 7, 2022?(BUSINESS WIRE)?Custom Truck One Source, Inc. (?Custom Truck One Source,? ?CTOS,? or the ?Company?) (NYSE: CTOS) today announced Fred Ross?s retirement from his position as Chief Executive Officer (?CEO?) effective March 20, 2023 and the Company?s Board of Directors? unanimous approval of the promotio

Amended and Restated Employment Agreement, dated December 7, 2022, by and between Fred Ross and Custom Truck One Source, Inc. (Incorporated by reference to Exhibit 10.2 of the Company’s Current Report on Form 8-K filed on December 7, 2022)

Exhibit 10.2 AMENDED AND RESTATED EMPLOYMENT AGREEMENT This AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of December 7, 2022 and will be effective as of March 20, 2023 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Fred M. Ross, Jr. (?Executive?). W I T N E S S E T H: WHEREAS, Executive and the Company are party

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): December 7, 2022 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) (Com

Amended and Restated Employment Agreement, dated December 7, 2022, by and between Ryan McMonagle and Custom Truck One Source, Inc. (Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K (File No. 001-38186) filed on December 7, 2022)

Exhibit 10.1 AMENDED AND RESTATED EMPLOYMENT AGREEMENT This AMENDED AND RESTATED EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of December 7, 2022 and will be effective as of March 20, 2023 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Ryan McMonagle (?Executive?). W I T N E S S E T H: WHEREAS, Executive and the Company are party to

Custom Truck One Source, Inc. Reports Strong Quarterly Gross Profit Growth

EXHIBIT 99.1 Custom Truck One Source, Inc. Reports Strong Quarterly Gross Profit Growth KANSAS CITY, Mo, November 8, 2022 (BUSINESS WIRE) ? Custom Truck One Source, Inc. (?CTOS,? ?we,? ?us,? ?our,? or the ?Company?) (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for its t

Form of Performance Stock Agreement (Incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q (File No. 001-38186) filed on November 8, 2022)

EXHIBIT 10.1 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Performance Stock Unit Grant Notice (the ?Grant Notice?) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the ?Plan?) of Custom Truck One Source, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPORT PURSUANT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 C

Form of Amended Performance Stock Agreement (Incorporated by reference to Exhibit 10.2 of the Company’s Quarterly Report on Form 10-Q (File No. 001-38186) filed on November 8, 2022)

EXHIBIT 10.2 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Performance Stock Unit Grant Notice (the ?Grant Notice?) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the ?Plan?) of Custom Truck One Source, Inc.

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): November 8, 2022 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) (Com

Custom Truck One Source to Participate in the Deutsche Bank 2022 Industrials Conference

EXHIBIT 99.1 Custom Truck One Source to Participate in the Deutsche Bank 2022 Industrials Conference KANSAS CITY, Mo., November 7, 2022?(BUSINESS WIRE)?Custom Truck One Source, Inc. (?Custom Truck One Source? or the ?Company?) (NYSE: CTOS) today announced that Chief Financial Officer, Chris Eperjesy, will participate in a fireside chat and will meet with institutional investors at the Deutsche Ban

Regulation FD Disclosure, Financial Statements and Exhibits

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): November 7, 2022 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) (Com

As filed with the Securities and Exchange Commission on August 19, 2022

As filed with the Securities and Exchange Commission on August 19, 2022 Registration No.

Filing Fee Table

Exhibit 107 CALCULATION OF FILING FEES TABLE FORM S-8 (Form Type) Custom Truck One Source, Inc.

Custom Truck One Source, Inc. Reports Strong Quarterly Gross Profit Growth

Exhibit 99.1 Custom Truck One Source, Inc. Reports Strong Quarterly Gross Profit Growth KANSAS CITY, Mo, August 9, 2022 /PRNewswire/ ? Custom Truck One Source, Inc. (?CTOS,? ?we,? ?our,? or the ?Company?) (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for its second quart

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): August 9, 2022 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) (Commi

Custom Truck One Source Appoints Christopher Eperjesy as New Chief Financial Officer and Announces $30 Million Stock Repurchase Program

Exhibit 99.1 Custom Truck One Source Appoints Christopher Eperjesy as New Chief Financial Officer and Announces $30 Million Stock Repurchase Program KANSAS CITY, Mo., Aug. 4, 2022 /PRNewswire/ ? Custom Truck One Source, Inc. (?Custom Truck One Source? or the ?Company?) (NYSE: CTOS) today announced that the Company?s Board of Directors has appointed Christopher J. Eperjesy to serve as Chief Financi

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Other Events

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): August 1, 2022 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) (Commi

Employment Agreement, dated August 2, 2022, by and between Christopher J. Eperjesy and Custom Truck One Source, Inc. (Incorporated by reference to Exhibit 10.1 of the Company’s Current Report on Form 8-K (File No. 001-38186) filed on August 4, 2022)

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of August 2, 2022 and effective as of August 15, 2022 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Christopher J. Eperjesy (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ

Custom Truck One Source to Announce Second Quarter 2022 Financial Results

Custom Truck One Source to Announce Second Quarter 2022 Financial Results KANSAS CITY, Mo.

Financial Statements and Exhibits, Other Events

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 25, 2022 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) (Commis

Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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): JUNE 14, 2022 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) (Commis

Regulation FD Disclosure, Financial Statements and Exhibits

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): June 2, 2022 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) (Commiss

Custom Truck One Source to Participate in the Stifel 2022 Cross Sector Insight Conference

Custom Truck One Source to Participate in the Stifel 2022 Cross Sector Insight Conference KANSAS CITY, Mo.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTO

Custom Truck One Source, Inc. Reports Strong Quarterly Revenue and Gross Profit Growth

Exhibit 99.1 Custom Truck One Source, Inc. Reports Strong Quarterly Revenue and Gross Profit Growth KANSAS CITY, MO, May 10, 2022 ? Custom Truck One Source, Inc. (?CTOS,? ?we,? ?our,? or the ?Company?) (NYSE: CTOS), a leading provider of specialty equipment to the electric utility, telecom, rail, and other infrastructure-related end markets, today reported financial results for its first quarterly

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): May 10, 2022 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) (Commiss

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. )

DEF 14A 1 a2021ctosproxy.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(A) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant o Check the appropriate box: o Preliminary Proxy Statement o Confidential, for Use of the Commission Only (as p

Custom Truck One Source to Present at the Oppenheimer 17th Annual Industrial Growth Conference

Custom Truck One Source to Present at the Oppenheimer 17th Annual Industrial Growth Conference KANSAS CITY, Mo.

Regulation FD Disclosure, Financial Statements and Exhibits

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): April 27, 2022 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) (Commi

Employment Agreement, by and between the Company and Raymond Todd Barrett, dated March 9, 2022 (Incorporated by reference to Exhibit 10.2 of the Company’s Report on Form 8-K (File No. 001-38186) filed on April 26, 2022)

Exhibit 10.2 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of March 9, 2022 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Raymond Todd Barrett (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive under the terms of this Agreem

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): April 22, 2022 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) (Commi

Custom Truck One Source Announces Management Transition Plan - Appoints Interim Chief Financial Officer - - Provides Preliminary First Quarter 2022 Revenue, Net Loss and Adjusted EBITDA Ranges -

Exhibit 99.1 Custom Truck One Source Announces Management Transition Plan - Appoints Interim Chief Financial Officer - - Provides Preliminary First Quarter 2022 Revenue, Net Loss and Adjusted EBITDA Ranges - KANSAS CITY, Mo., April 26, 2022 ? Custom Truck One Source, Inc. (?Custom Truck One Source? or the ?Company?) (NYSE: CTOS) today announced that Todd Barrett, Chief Accounting Officer, will be

Letter Agreement, by and between the Company and Raymond Todd Barrett, dated April 25, 2022

Exhibit 10.1 CUSTOM TRUCK ONE SOURCE, INC. April 25, 2022 Raymond Todd Barrett Dear Todd: This letter (this ?Letter Agreement?) memorializes the agreement between you and Custom Truck One Source, Inc. (the ?Company?) regarding certain changes to your compensation in connection with your appointment to serve as Interim Chief Financial Officer of the Company. This Letter Agreement shall be effective

Custom Truck One Source to Announce First Quarter 2022 Financial Results

Custom Truck One Source to Announce First Quarter 2022 Financial Results KANSAS CITY, Mo.

Financial Statements and Exhibits, Other Events

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): April 21, 2022 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) (Commi

Custom Truck One Source Announces Appointment of Vice Admiral Mary Jackson to Board of Directors

Custom Truck One Source Announces Appointment of Vice Admiral Mary Jackson to Board of Directors KANSAS CITY, Mo.

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): April 11, 2022 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) (Commi

Regulation FD Disclosure, Financial Statements and Exhibits

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): March 17, 2022 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) (Commi

Custom Truck One Source to Present at the Sidoti Spring 2022 Small Cap Virtual Conference

Custom Truck One Source to Present at the Sidoti Spring 2022 Small Cap Virtual Conference KANSAS CITY, Mo.

Description of the Registrant’s Securities Registered under Section 12 of the Exchange Act.

Exhibit 4.3 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description sets forth certain material terms and provisions of the securities of Custom Truck One Source, Inc. (the ?Company,? ?we,? ?us? or ?our?) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). The following descriptio

Employment Agreement, dated November 2, 2021, by and between Thomas “Smiley” Rich and Custom Truck One Source, Inc. (Incorporated by reference to Exhibit 10.15 of the Company’s Annual Report on Form 10-K (File No. 001-38186) filed on March 16, 2022)

Exhibit 10.15 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of November 2, 2021 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Thomas Rich (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive under the terms of this Agreement.

Form of Restricted Stock Agreement (Incorporated by reference to Exhibit 10.18 of the Company’s Annual Report on Form 10-K (File No. 001-38186) filed on March 16, 2022)

Exhibit 10.18 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Restricted Stock Unit Grant Notice (the ?Grant Notice?) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the ?Plan?) of Custom Truck One Source, Inc. (

Form of Performance Stock Agreement

Exhibit 10.17 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN PERFORMANCE STOCK UNIT GRANT NOTICE Capitalized terms not specifically defined in this Performance Stock Unit Grant Notice (the ?Grant Notice?) have the meanings given to them in the Amended and Restated 2019 Omnibus Incentive Plan (as amended from time to time, the ?Plan?) of Custom Truck One Source, Inc.

Employment Agreement, dated November 2, 2021, by and between Joe Ross and Custom Truck One Source, Inc. (Incorporated by reference to Exhibit 10.16 of the Company’s Annual Report on Form 10-K (File No. 001-38186) filed on March 16, 2022)

Exhibit 10.16 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of November 2, 2021 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Joseph Ross (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive under the terms of this Agreement.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTI

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 CUSTOM TRU

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware NESCO El Alquiler S. de R.L. de C.V. Mexico CTOS Blocker GP I L.L.C. Delaware CTOS Blocker GP II L

Three Months Ended December 31,

Exhibit 99.1 Custom Truck One Source, Inc. Reports Strong Full-Year Pro Forma Combined Revenue, Adjusted EBITDA, and Gross Profit Growth for 2021 KANSAS CITY, MO, March 10, 2022 ? Custom Truck One Source, Inc. (NYSE: CTOS, ?CTOS,? ?we,? ?our,? or the ?Company?), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today repo

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): March 10, 2022 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) (Commi

CTOS / Custom Truck One Source, Inc. / Blackstone Holdings III L.P. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 2)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 64083J104 (CUSIP Number) John G. Finley Blackstone Inc. 345 Park Avenue New York, New York 10154 Tel: (212) 583-5000 (Name, A

Financial Statements and Exhibits, Other Events

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): February 17, 2022 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) (Co

Custom Truck One Source to Announce Fourth Quarter and Full-Year 2021 Financial Results

Custom Truck One Source to Announce Fourth Quarter and Full-Year 2021 Financial Results KANSAS CITY, Mo.

Custom Truck One Source to Present at the Citi 2022 Global Industrial Tech and Mobility Conference

Custom Truck One Source to Present at the Citi 2022 Global Industrial Tech and Mobility Conference KANSAS CITY, Mo.

Regulation FD Disclosure, Financial Statements and Exhibits

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): February 15, 2022 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) (Co

Regulation FD Disclosure, Financial Statements and Exhibits

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 14, 2022 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) (Com

Custom Truck One Source Acquires HiRail Leasing Group

Custom Truck One Source Acquires HiRail Leasing Group Highlights ?Custom Truck One Source, Inc.

Regulation FD Disclosure, Financial Statements and Exhibits

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 6, 2022 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) (Comm

Custom Truck One Source to Present at the CJS Securities 22nd Annual New Ideas for the New Year Conference

EX-99.1 2 ex99101062022pressrelease.htm EX-99.1 Custom Truck One Source to Present at the CJS Securities 22nd Annual New Ideas for the New Year Conference KANSAS CITY, Mo., Jan. 6, 2022 /PRNewswire/ - Custom Truck One Source, Inc. (NYSE: CTOS) today announced that CEO, Fred Ross, President and Chief Operating Officer, Ryan McMonagle, and Chief Financial Officer, Brad Meader will present at the CJS

JOINT FILING AGREEMENT

EX-99.1 2 d285054dex991.htm EX-99.1 Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13D. Each of them is responsible for the timely filing of such statement and any amendments thereto, and for the completeness and accuracy of t

CTOS / Custom Truck One Source, Inc. / ECP ControlCo, LLC - SC 13D/A NO. 3 Activist Investment

SC 13D/A NO. 3 United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 3)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 640

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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): December 6, 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) (Com

CTOS / Custom Truck One Source, Inc. / Blackstone Holdings III L.P. - SC 13D/A Activist Investment

SC 13D/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1) Custom Truck One Source, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 64083J104 (CUSIP Number) John G. Finley Blackstone Inc. 345 Park Avenue New York, New York 10154 Tel: (212) 583-5000 (Name, Ad

Underwriting Agreement, dated as of November 17, 2021, by and among the Company, the Underwriters and the Selling Stockholders

Exhibit 1.1 Execution Version CUSTOM TRUCK ONE SOURCE, INC. 12,322,975 Shares (plus an option to purchase up to 1,848,446 additional Shares) Common Stock ($0.0001 par value) Underwriting Agreement New York, New York November 17, 2021 Citigroup Global Markets Inc. As Representative of the several Underwriters, c/o Citigroup Global Markets Inc. 388 Greenwich Street New York, New York 10013 Ladies an

Financial Statements and Exhibits, Other Events

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): November 17, 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) (Co

12,322,975 Shares CUSTOM TRUCK ONE SOURCE, INC. Common Stock

PROSPECTUS SUPPLEMENT (To Prospectus dated September 23, 2021) Filed Pursuant to Rule 424(b)(7) Registration No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ☐ TRANSITION REPORT PURSUANT

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number: 001-38186 C

Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information September 30, 2021 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.1 Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information September 30, 2021 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION On December 3, 2020, Custom Truck One Source, Inc., formerly Nesco Holdings, Inc. ("CTOS, Inc." or the "Company") and NESCO Holdings II, Inc., a subsidiary of the Company (?Buyer? or ?Issuer?), entered into a Purchas

Financial Statements and Exhibits

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): November 15, 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) (Co

Subject to Completion, dated November 15, 2021

The information contained in this preliminary prospectus supplement is not complete and may be changed.

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): November 9, 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) (Com

Three Months Ended September 30, Nine Months Ended September 30, Three Months Ended June 30, 2021 (in $000s except per share data) 2021 2020 2021 2020 Revenue Rental revenue $ 109,108 $ 46,125 $ 255,936 $ 144,103 $ 98,539 Equipment sales 217,163 11,5

Exhibit 99.1 Custom Truck One Source, Inc. Reports Pro Forma Combined 18.1% Revenue Increase for Third Quarter 2021 KANSAS CITY, MO, November 9, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS, ?CTOS,? ?we,? ?our,? or the ?Company?), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for i

Employment Agreement, dated November 2, 2021, by and between Fred Ross and Custom Truck One Source, Inc.

Exhibit 10.1 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of November 2, 2021 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Fred M. Ross, Jr. (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive under the terms of this Agreem

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): November 2, 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) (Com

Employment Agreement, dated November 2, 2021, by and between Bradley Meader and Custom Truck One Source, Inc.

Exhibit 10.2 EMPLOYMENT AGREEMENT This EMPLOYMENT AGREEMENT (this ?Agreement?) is made and entered into as of November 2, 2021 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (the ?Company?), and Bradley Meader (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ Executive under the terms of this Agreement

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

Regulation FD Disclosure, Financial Statements and Exhibits

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): November 4, 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) (Com

Financial Statements and Exhibits, Other Events

8-K 1 a8-k801otherevents20211026.htm 8-K 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): October 26, 2021 CUSTOM TRUCK ONE SOURCE, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or

CUSTOM TRUCK ONE SOURCE TO ANNOUNCE THIRD QUARTER 2021 RESULTS

Exhibit 99.1 CUSTOM TRUCK ONE SOURCE TO ANNOUNCE THIRD QUARTER 2021 RESULTS KANSAS CITY, Mo., ? October 26, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS) today announced it will release third quarter 2021 financial results after the market close on Tuesday, November 9, 2021. Management will discuss the results on a conference call at 5:00 pm ET on Tuesday, November 9, 2021. The webcast and a p

7701 Independence Avenue Kansas City, Missouri 64125

CORRESP 1 filename1.htm 7701 Independence Avenue Kansas City, Missouri 64125 October 25, 2021 VIA EDGAR CORRESPONDENCE Scott Stringer Adam Phippen Division of Corporation Finance Office of Trade & Services Securities and Exchange Commission 100 F Street, NE Washington, D.C. 20549 Re: Custom Truck One Source, Inc. Form 10-K for the fiscal year ended December 31, 2020 Filed March 9, 2021 Form 8-K fi

Regulation FD Disclosure, Financial Statements and Exhibits

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): October 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) (Comm

Custom Truck One Source To Present At Deutsche Bank’s 29th Annual Leveraged Finance Conference

Exhibit 99.1 Custom Truck One Source To Present At Deutsche Bank?s 29th Annual Leveraged Finance Conference KANSAS CITY, Mo., ? October 1, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS) today announced that President and Chief Operating Officer, Ryan McMonagle, and Chief Financial Officer, Brad Meader will present at the Deutsche Bank 29th Annual Leveraged Finance Conference on Tuesday, October

Custom Truck One Source, Inc. 7701 Independence Ave Kansas City, Missouri 64125

Custom Truck One Source, Inc. 7701 Independence Ave Kansas City, Missouri 64125 September 29, 2021 Via Edgar Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Cara Wirth Re: Custom Truck One Source, Inc. Registration Statement on Form S-3 File No. 333-259725 Ladies and Gentlemen: Custom Truck One Source, Inc. (the ?Registrant?)

As filed with the Securities and Exchange Commission on September 23, 2021

As filed with the Securities and Exchange Commission on September 23, 2021 No. 333-259725 UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Amendment No. 1 to FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CUSTOM TRUCK ONE SOURCE, INC. (Exact name of registrant as specified in its charter) Delaware 84-2531628 (State or other jurisdiction of incorporation or

As filed with the Securities and Exchange Commission on September 22, 2021

As filed with the Securities and Exchange Commission on September 22, 2021 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CUSTOM TRUCK ONE SOURCE, INC. (Exact name of registrant as specified in its charter) Delaware 84-2531628 (State or other jurisdiction of incorporation or organization) (I.R.S. Emp

Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information June 30, 2021 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information June 30, 2021 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION On December 3, 2020, Custom Truck One Source, Inc., formerly Nesco Holdings, Inc. ("CTOS, Inc." or the "Company") and NESCO Holdings II, Inc., a subsidiary of the Company (?Buyer? or ?Issuer?), entered into a Purchase and Sale Agreeme

CUSTOM TRUCK ONE SOURCE TO PRESENT AT DA DAVIDSON DIVERSIFIED INDUSTRIALS & SERVICES CONFERENCE

Exhibit 99.1 CUSTOM TRUCK ONE SOURCE TO PRESENT AT DA DAVIDSON DIVERSIFIED INDUSTRIALS & SERVICES CONFERENCE KANSAS CITY, Mo., ? September 20, 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 DA Davidson 20th Annual Diversifie

Regulation FD Disclosure, Financial Statements and Exhibits

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): September 20, 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) (C

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ☐ TRANSITION REPORT PURSUANT TO S

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-38186 CUSTOM

Regulation FD Disclosure, Financial Statements and Exhibits, Results of Operations and Financial Condition

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): August 12, 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) (Comm

Three Months Ended June 30, Six Months Ended June 30, (in $000s except per share data) 2021 2020 2021 2020 Revenue Rental revenue $ 98,539 $ 46,984 $ 146,828 $ 97,978 Equipment sales 247,675 10,400 265,662 27,070 Parts sales and services 28,897 11,09

Exhibit 99.1 Custom Truck One Source, Inc. Reports Combined 27% Revenue Increase for Second Quarter 2021 KANSAS CITY, MO, August 12, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS, ?CTOS? or the ?Company?), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for its second quarterly period

Financial Statements and Exhibits, Other Events

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): August 3, 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) (Commi

CUSTOM TRUCK ONE SOURCE TO ANNOUNCE SECOND QUARTER 2021 RESULTS

Exhibit 99.1 CUSTOM TRUCK ONE SOURCE TO ANNOUNCE SECOND QUARTER 2021 RESULTS KANSAS CITY, Mo., ? August 3, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS) today announced it will release second quarter 2021 earnings results after the market close on Thursday, August 12, 2021. Management will discuss the results on a conference call at 5:00 pm ET on Thursday, August 12th, 2021. The webcast and a

1 Custom Truck One Source Investor Presentation Q1 2021 Financial Summary July 2021 CONFIDENTIAL DRAFT 2 Custom Truck One Source, L.P. Q1 Highlights Key Highlights • Revenue grew 16.5% or $45 million compared to prior year • New and Used combined rev

1 Custom Truck One Source Investor Presentation Q1 2021 Financial Summary July 2021 CONFIDENTIAL DRAFT 2 Custom Truck One Source, L.

Custom Truck One Source, L.P. and Subsidiaries Condensed Consolidated Financial Statements (unaudited) As of March 31, 2021 and December 31, 2020 and for the three months ended March 31, 2021 and 2020 Custom Truck One Source, L.P. and Subsidiaries Ta

Exhibit 99.1 Custom Truck One Source, L.P. and Subsidiaries Condensed Consolidated Financial Statements (unaudited) As of March 31, 2021 and December 31, 2020 and for the three months ended March 31, 2021 and 2020 Custom Truck One Source, L.P. and Subsidiaries Table of Contents Page Number Unaudited Condensed Consolidated Financial Statements 3 Unaudited Condensed Consolidated Balance Sheets as of

Regulation FD Disclosure, Financial Statements and Exhibits

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 29, 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) (Commis

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

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 8, 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) (Commiss

Regulation FD Disclosure, Financial Statements and Exhibits

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 7, 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) (Commiss

CUSTOM TRUCK ONE SOURCE TO PRESENT AT CJS ANNUAL NEW IDEAS CONFERENCE

Exhibit 99.1 CUSTOM TRUCK ONE SOURCE TO PRESENT AT CJS ANNUAL NEW IDEAS CONFERENCE KANSAS CITY, Mo., ? July 7, 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 CJS Annual New Ideas Conference on Tuesday, July 13, 2021. The presen

Custom Truck One Source, Inc. Amended and Restated 2019 Omnibus Incentive Plan (filed as Annex A to Custom Truck One Source, Inc.’s Definitive Proxy Statement on Schedule 14A filed June 10, 2021, File No. 001-38186, and incorporated herein by reference)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A PROXY STATEMENT PURSUANT TO SECTION 14(a) OF THE SECURITIES EXCHANGE ACT OF 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

As filed with the Securities and Exchange Commission on June 4, 2021

As filed with the Securities and Exchange Commission on June 4, 2021 Registration No.

Custom Truck One Source, Inc. Amended and Restated 2019 Omnibus Incentive Plan, as adopted by the Board of Directors of the Company on May 27, 2021 (subject to stockholder approval at the Registrant’s 2021 annual meeting of stockholders)

Exhibit 10.1 CUSTOM TRUCK ONE SOURCE, INC. AMENDED AND RESTATED 2019 OMNIBUS INCENTIVE PLAN Article I. Purpose The Plan?s purpose is to enhance the Company?s ability to attract, retain and motivate persons who make (or are expected to make) important contributions to the Company by providing these individuals with equity ownership opportunities. Capitalized terms used in the Plan are defined in Ar

Transition Agreement, dated May 20, 2021, by and between Joshua Boone and Custom Truck One Source, Inc.

Exhibit 10.1 EMPLOYMENT TRANSITION AGREEMENT This EMPLOYMENT TRANSITION AGREEMENT (this ?Agreement?) is made and entered into this May 20, 2021 (the ?Effective Date?), by and between Custom Truck One Source, Inc. (f/k/a NESCO Holdings, Inc, the ?Company?), and Joshua Boone (?Executive?). W I T N E S S E T H: WHEREAS, Executive wishes to be employed by the Company and the Company wishes to employ E

GENERAL RELEASE OF ALL CLAIMS

Exhibit 99.1 CERTAIN PERSONAL INFORMATION CONTAINED IN THIS EXHIBIT, MARKED BY [***], HAS BEEN OMITTED FROM THIS EXHIBIT pursuant to Item 601(a)(6) of Regulation S-K. GENERAL RELEASE OF ALL CLAIMS This General Release of All Claims (this ?Agreement?) is entered into by and among Custom Truck One Source, Inc., a Delaware corporation (f/k/a NESCO Holdings, Inc., the ?Company?), and Lee Jacobson (?Ex

Good Reason Extension Letter, dated May 21, 2021, by and between Robert Blackadar and Custom Truck One Source, Inc.

Exhibit 10.2 CUSTOM TRUCK ONE SOURCE, INC. May 21, 2021 Robert Blackadar Dear Rob: You and Custom Truck One Source, Inc. (f/k/a NESCO Holdings, Inc., the ?Company?) are parties to that certain employment agreement, dated as of May 13, 2019 (the ?Employment Agreement?), which sets forth the terms of your employment with the Company. As we have discussed, there may be some changes in roles and respo

Good Reason Extension Letter, dated May 20, 2021, by and between Kevin Kapelke and Custom Truck One Source, Inc.

Exhibit 10.3 CUSTOM TRUCK ONE SOURCE, INC. May 20, 2021 Kevin Kapelke Dear Kevin: You and Custom Truck One Source, Inc. (f/k/a NESCO Holdings, Inc., the ?Company?) are parties to that certain employment agreement, dated as of February 26, 2014 (the ?Employment Agreement?), which sets forth the terms of your employment with the Company. As we have discussed, there may be some changes in roles and r

Regulation FD Disclosure, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Financial Statements and Exhibits

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): May 20, 2021 CUSTOM TRUCK ONE SOURCE, INC. (Exact Name of Registrant as Specified in Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission

Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.

Exhibit 32 CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350 AS ADOPTED PURSUANT TO SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 In connection with the Quarterly Report of Custom Truck One Source, Inc. (the ?Company?) on Form 10-Q for the three months ended March 31, 2021, as filed with the Securities and Exchange Commission (the ?Report?), each of the undersigned, in the capacities and on the dat

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 ☐ TRANSITION REPORT PURSUANT TO

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-38186 CUSTOM

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware NESCO El Alquiler S. de R.L. de C.V. Mexico CTOS Blocker GP I L.L.C. Delaware CTOS Blocker GP II L

Custom Truck One Source, Inc. Nesco Holdings, Inc. Standalone Condensed Consolidated Statements of Operations (unaudited) Three Months Ended March 31, (in $000s except per share data) 2021 2020 Revenue Rental revenue $ 48,289 $ 50,994 Sales of rental

Exhibit 99.1 Custom Truck One Source, Inc. Reports First Quarter 2021 Financial Results KANSAS CITY, MO, May 12, 2021 ? Custom Truck One Source, Inc. (NYSE: CTOS, ?CTOS? or the ?Company?), a leading provider of specialty equipment to the electric utility, telecom, rail and other infrastructure-related end markets, today reported financial results for its first quarter ended March 31, 2021. On Apri

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): May 12, 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) (Commiss

Custom Truck One Source, Inc. 7701 Independence Ave Kansas City, Missouri 64125

Custom Truck One Source, Inc. 7701 Independence Ave Kansas City, Missouri 64125 May 12, 2021 Via Edgar Securities and Exchange Commission Division of Corporation Finance 100 F Street, N.E. Washington, D.C. 20549-4628 Attn: Cara Wirth Re: Custom Truck One Source, Inc. Registration Statement on Form S-3 File No. 333-255828 Ladies and Gentlemen: Custom Truck One Source, Inc. (the ?Registrant?) hereby

Form S-3

As filed with the Securities and Exchange Commission on May 6, 2021 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-3 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 CUSTOM TRUCK ONE SOURCE, INC. (Exact name of registrant as specified in its charter) Delaware 84-2531628 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer I

Custom Truck One Source, L.P. and Subsidiaries Consolidated Financial Statements As of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018, and Independent Auditors’ Report

Exhibit 99.1 Custom Truck One Source, L.P. and Subsidiaries Consolidated Financial Statements As of December 31, 2020 and 2019 and for the years ended December 31, 2020, 2019 and 2018, and Independent Auditors? Report INDEPENDENT AUDITORS? REPORT To the Partners of Custom Truck One Source, L.P.: We have audited the accompanying consolidated financial statements of Custom Truck One Source, L.P. and

Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information December 31, 2020 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION

Exhibit 99.2 Custom Truck One Source, Inc. Unaudited Pro Forma Condensed Combined Financial Information December 31, 2020 UNAUDITED PRO FORMA CONDENSED COMBINED FINANCIAL INFORMATION On December 3, 2020, the Company and NESCO Holdings II, Inc., a subsidiary of the Company (?Buyer? or ?Issuer?), entered into a Purchase and Sale Agreement (the ?Purchase Agreement?) with certain affiliates of The Bla

Financial Statements and Exhibits

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 In

1 Custom Truck One Source Oppenheimer 16 th Annual Industrial Growth Conference May 4, 2021 CONFIDENTIAL DRAFT 2 This presentation includes certain financial measures that have not been prepared in a manner that complies with generally ac cep ted acc

Exhibit 99.1 1 Custom Truck One Source Oppenheimer 16 th Annual Industrial Growth Conference May 4, 2021 CONFIDENTIAL DRAFT 2 This presentation includes certain financial measures that have not been prepared in a manner that complies with generally ac cep ted accounting principles in the United States (?GAAP?), including, without limitation, EBITDA, Adjusted EBITDA, and Pro Forma Adjusted EBITDA (

Regulation FD Disclosure, Financial Statements and Exhibits

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): May 4, 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) (Commissi

Joint Filing Agreement.

Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13D.

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities

SC 13D United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. )* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 64083J104 (C

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities

SC 13D/A United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13D (Rule 13d-101) Information to be Included in Statements Filed Pursuant to § 240.13d-1(a) and Amendments Thereto Filed Pursuant to § 240.13d-2(a) Under the Securities Exchange Act of 1934 (Amendment No. 2)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock (Title of Class of Securities) 64083J104

Joint Filing Agreement.

EX-99.1 Exhibit 1 JOINT FILING AGREEMENT In accordance with Rule 13d-1(k)(1) promulgated under the Securities Exchange Act of 1934, as amended, the undersigned hereby agree that they are jointly filing this statement on Schedule 13D. Each of them is responsible for the timely filing of such statement and any amendments thereto, and for the completeness and accuracy of the information concerning su

JOINT FILING AGREEMENT

EX-99.A Exhibit A JOINT FILING AGREEMENT Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended, and the rules and regulations thereunder (the “Exchange Act”) the undersigned hereby agree to the joint filing on behalf of each of them of any filing required by such party under Section 13 of the Exchange Act or any rule or regulation thereunder (including any amendment, r

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Custom Truck One Source, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class

SC 13D UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. )* Custom Truck One Source, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 64083J104 (CUSIP Number) John G. Finley The Blackstone Group Inc. 345 Park Avenue New York, New York 10154 Tel: (212) 583-5000 (

Financial Statements and Exhibits, Changes in Registrant's Certifying Accountant

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): 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) (Commis

Letter from Deloitte & Touche LLP

Exhibit 16.1 April 6, 2021 Securities and Exchange Commission 100 F Street, N.E. Washington, DC 20549 Dear Sirs/Madams: We have read Item 4.01 of Custom Truck One Source, Inc.?s (formerly known as Nesco Holdings, Inc.) Form 8-K dated April 1, 2021, and have the following comments: 1.We agree with the statements made in the first through fourth paragraphs. 2.We have no basis on which to agree or di

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13D Under the Securities Exchange Act of 1934 (Amendment No. 1)* Custom Truck One Source, Inc. (Name of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securities) 64083J104 (CUSIP Number) John Holland Platinum Equity Advisors, LLC 360 North Crescent Drive, South Building Beverly Hills, CA 90210 (310) 712-1850

Regulation FD Disclosure, Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Entry into a Material Definitive Agreement, Financial Statements and Exhibits, Completion of Acquisition or Disposition of Assets, Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant, Unregistered Sales of Equity Securities, Material Modification to Rights of Security Holders, Changes in Control of Registrant, Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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): 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) (Commis

Amended and Restated Stockholders Agreement

Exhibit 10.5 AMENDED AND RESTATED STOCKHOLDERS? AGREEMENT of CUSTOM TRUCK ONE SOURCE, INC. Dated as of April 1, 2021 TABLE OF CONTENTS ARTICLE I CORPORATE GOVERNANCE 2 Section 1.1 Board of Directors Composition 2 Section 1.2 Committees; Subsidiary Boards 6 Section 1.3 Operating Council 7 Section 1.4 Board Quorum and Action by Written Consent 8 Section 1.5 Special Meetings of the Board 8 Section 1.

Form of 5.50% Senior Note due 2029 (included in Exhibit 4.1 hereto) (Incorporated by reference to Exhibit 4.2 of the Company’s Current Report on Form 8-K filed on April 2, 2021)

Exhibit 4.1 NESCO HOLDINGS II, INC. and the Guarantors from time to time party hereto $920,000,000 5.500% SENIOR SECURED SECOND LIEN NOTES DUE 2029 INDENTURE Dated as of April 1, 2021 WILMINGTON TRUST, NATIONAL ASSOCIATION as Trustee and as Notes Collateral Agent TABLE OF CONTENTS Page ARTICLE 1 DEFINITIONS AND INCORPORATION BY REFERENCE Section 1.01 Definitions. 1 Section 1.02 Other Definitions.

Form Indemnification Agreement

Exhibit 10.7 FORM INDEMNIFICATION And Advancement AGREEMENT This Indemnification and Advancement Agreement (?Agreement?) is made as of , 20 by and between , Inc., a Delaware corporation (the ?Company?), and , [a member of the Board of Directors/an officer/an employee/an agent/a fiduciary] of the Company (?Indemnitee?). This Agreement supersedes and replaces any and all previous agreements between

Corporate Advisory Services Agreement, dated as of April 1, 2021, between Custom Truck One Source, Inc. and Platinum Equity Advisors, LLC (Incorporated by reference to Exhibit 10.6 of the Company’s Current Report on Form 8-K filed on April 2, 2021)

Exhibit 10.6 Execution Version CORPORATE ADVISORY SERVICES AGREEMENT This CORPORATE ADVISORY SERVICES AGREEMENT (this ?Agreement?) is entered into as of April 1, 2021 by and between Custom Truck One Source, Inc., a Delaware corporation f/k/a Nesco Holdings, Inc. (the ?Company?) and Platinum Equity Advisors, LLC (?Platinum?), a Delaware limited liability company (?Advisor?). RECITALS A. The Company

Registration Rights Agreement, dated as of April 1, 2021

Exhibit 10.4 Final Form REGISTRATION RIGHTS AGREEMENT BY AND BETWEEN CUSTOM TRUCK ONE SOURCE, INC. AND THE INVESTORS PARTY HERETO Dated as of April 1, 2020 TABLE OF CONTENTS Page Article I Resale Shelf Registration 1 Section 1.1 Resale Shelf Registration Statement 1 Section 1.2 Effectiveness Period 1 Section 1.3 Subsequent Shelf Registration 2 Section 1.4 Supplements and Amendments 2 Section 1.5 S

Amended and Restated Bylaws.

Exhibit 3.2 Bylaws of Custom Truck One Source, Inc. (a Delaware corporation) Table of Contents Page Article I - Corporate Offices 1 1.1 Registered Office 1 1.2 Other Offices 1 Article II - Meetings of Stockholders 1 2.1 Place of Meetings 1 2.2 Annual Meeting 1 2.3 Special Meeting 1 2.4 Advance Notice Procedures for Business Brought before a Meeting 2 2.5 Advance Notice Procedures for Nominations o

Amended and Restated Certificate of Incorporation, as amended.

Exhibit 3.1 RESTATED CERTIFICATE OF INCORPORATION OF CUSTOM TRUCK ONE SOURCE, INC. Pursuant to Section 245 of the General Corporation Law of the State of Delaware Custom Truck One Source, Inc. a corporation duly organized and existing under the General Corporation Law of the State of Delaware (the ?Corporation?), does hereby certify that: 1. The present name of the corporation is Custom Truck One

Nesco Holdings Completes Acquisition of Custom Truck One Source in Partnership with Platinum Equity and Changes Its Name to Custom Truck One Source, Inc.

Exhibit 99.1 Nesco Holdings Completes Acquisition of Custom Truck One Source in Partnership with Platinum Equity and Changes Its Name to Custom Truck One Source, Inc. Kansas City, MO., April 1, 2021 /PRNewsire/ Nesco Holdings, Inc. (NYSE: NSCO) (?Nesco?), which has been renamed as Custom Truck One Source, Inc. (the ?Company?) effective today, in partnership with an affiliate of Platinum Equity, LL

Revolving Credit Agreement, dated as of April 1, 2021, by and among Capitol Investment Merger Sub 2, LLC, NESCO Holdings II, Inc., the various lenders and issuing banks party thereto and Bank of America, N.A., as administrative agent, collateral agent and swingline lender (Incorporated by reference to Exhibit 10.3 of the Company’s Current Report on Form 8-K filed on April 2, 2021)

Exhibit 10.3 REVOLVING CREDIT AGREEMENT among CAPITOL INVESTMENT MERGER SUB 2, LLC, as HOLDINGS, NESCO HOLDINGS II, INC., as BORROWER, VARIOUS LENDERS AND ISSUING BANKS and BANK OF AMERICA, N.A., as Administrative Agent, Collateral Agent and Swingline Lender Dated as of April 1, 2021 BOFA SECURITIES, INC., PNC CAPITAL MARKETS LLC, WELLS FARGO BANK, N.A., CITIBANK, N.A., DEUTSCHE BANK SECURITIES IN

Nesco Holdings, Inc. to Become Custom Truck One Source, Inc., Change Ticker Symbol to CTOS

Exhibit 99.1 Nesco Holdings, Inc. to Become Custom Truck One Source, Inc., Change Ticker Symbol to CTOS FORT WAYNE, INDIANA, March 19, 2021 – Nesco Holdings, Inc. (NYSE: NSCO) (“Nesco” or the “Company”) announced today that, in anticipation of the previously announced proposed acquisition by Nesco’s wholly owned subsidiary, Nesco Holdings II, Inc., of 100% of the limited partnership interests of C

Regulation FD Disclosure, Financial Statements and Exhibits

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): March 19, 2021 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission Fil

T 1 Nesco and Custom Truck One Source Investor Presentation March 16, 2021 This document and any related presentation has been prepared byNesco Holdings, Inc. (“Nesco” or the “Company”) in connection with its proposed acquisition of Custom Truck One

Exhibit 99.3 T 1 Nesco and Custom Truck One Source Investor Presentation March 16, 2021 This document and any related presentation has been prepared byNesco Holdings, Inc. (?Nesco? or the ?Company?) in connection with its proposed acquisition of Custom Truck One Source, L.P. (together with its subsidiaries, ?Custom Truck?), and does not constitute an offer or invitation to subscribe for, purchase,

Use of Non-GAAP Financial Information

Exhibit 99.2 Nesco Holdings II, Inc. (the ?company,? ?Nesco,? ?we,? ?us? or ?our?) has disclosed the information reproduced or summarized below in connection with a proposed transaction: Use of Non-GAAP Financial Information We believe that the financial statements included in this offering memorandum have been prepared in a manner that complies, in all material respects, with generally accepted a

Regulation FD Disclosure, Financial Statements and Exhibits

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): March 16, 2021 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission Fil

Nesco Announces Offering of $920 Million of Senior Secured Second Lien Notes by Nesco Holdings II, Inc.

Exhibit 99.1 Nesco Announces Offering of $920 Million of Senior Secured Second Lien Notes?by Nesco Holdings II, Inc. FORT WAYNE, INDIANA, March 15, 2021 ? Nesco Holdings, Inc. (NYSE: NSCO, ?Nesco?) announced today that its indirect wholly owned subsidiary Nesco Holdings II, Inc. (the ?Issuer?) intends to offer $920 million aggregate principal amount of senior secured second lien notes due 2029 (th

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

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): March 5, 2021 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission File

Annual Report - 10-K

Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 10-K ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission File Number 001-38186 Nesco Holdi

Subsidiaries of the Company

Exhibit 21.1 SUBSIDIARIES OF THE COMPANY Name Jurisdiction Capitol Intermediate Holdings, LLC Delaware Capitol Investment Merger Sub 2, LLC Delaware NESCO Holdings II, Inc. Delaware NESCO, LLC Indiana NESCO Finance Corporation Delaware NESCO International, LLC Delaware NESCO Investments, LLC Delaware NESCO El Alquiler S. de R.L. de C.V. Mexico

Description of Capital Stock.

Exhibit 4.6 DESCRIPTION OF THE REGISTRANT?S SECURITIES REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The following description sets forth certain material terms and provisions of the securities of Nesco Holdings, Inc. (the ?Company,? ?we,? ?us? or ?our?) that are registered under Section 12 of the Securities Exchange Act of 1934, as amended (the ?Exchange Act?). The following description of our

Form of Restricted Stock Agreement

Exhibit 10.16 Form of Restricted Stock Agreement NESCO HOLDINGS, INC. 2019 OMNIBUS INCENTIVE PLAN RESTRICTED STOCK Unit Grant Notice Capitalized terms not specifically defined in this Restricted Stock Unit Grant Notice (the ?Grant Notice?) have the meanings given to them in the 2019 Omnibus Incentive Plan (as amended from time to time, the ?Plan?) of Nesco Holdings, Inc. (the ?Company?). The Compa

Nesco Holdings, Inc. Condensed Consolidated Statements of Operations (unaudited) Three Months Ended December 31, Twelve Months Ended December 31, (in $000s except per share data) 2020 2019 2020 2019 Revenue Rental revenue $ 51,387 $ 54,125 $ 195,490

Exhibit 99.1 Nesco Holdings, Inc. Reports Fourth Quarter and Full Year 2020 Financial Results Fourth Quarter Highlights All metrics compared to fourth quarter 2019 unless otherwise noted •Total revenue increased 7.8% to $83.3 million •Equipment Rental and Sales (ERS) segment revenue increased 7.3% to $65.2 million •Parts, Tools and Accessories (PTA) segment revenue increased 9.6% to $18.0 million

Financial Statements and Exhibits, Results of Operations and Financial Condition

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): March 8, 2021 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission File

Financial Statements and Exhibits, Other Events, Submission of Matters to a Vote of Security Holders

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): February 16, 2021 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission

Nesco Holdings’ Shareholders Approve the Proposals Required to Consummate the Acquisition of Custom Truck One Source in Partnership with Platinum Equity

Exhibit 99.1 FOR IMMEDIATE RELEASE Nesco Holdings’ Shareholders Approve the Proposals Required to Consummate the Acquisition of Custom Truck One Source in Partnership with Platinum Equity FORT WAYNE, Ind. – February 19, 2021 – Nesco Holdings, Inc. (NYSE: NSCO, "Nesco" or the "Company") announced today that, at its special meeting of shareholders, held yesterday, shareholders approved and adopted t

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No. 3)* Nesco Holdings, Inc.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, DC 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Nesco Holdings, Inc. (Name of Issuer) (Title of Class of Securities) 64083J104 (CUSIP Number) December 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* Nesco Holdings, Inc. (Name of Issuer) (Title of Class of Securities) 64083J104 (CUSIP Number) December 31, 2020 (Date of Event which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is fil

Schedule 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Information Required in Proxy Statement Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant £ Check the appropriate box: £ Preliminary Proxy Statement £ Confidential, for Use of the Commission

Amendment to Employment Agreement and RSU Agreement

Exhibit 10.1 AMENDMENT TO EMPLOYMENT AGREEMENT AND RSU AGREEMENT This AMENDMENT TO EMPLOYMENT AGREEMENT AND RSU AGREEMENT (“Amendment”) is entered into as of December 30, 2020 by and among NESCO Holdings, Inc., a Delaware corporation (the “Company”), and Joshua Boone (“Executive”). WHEREAS, the Company and Executive previously entered into that certain Employment Agreement, dated as of May 15, 202

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers - CURRENT REPORT

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): December 28, 2020 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission

- PRELIMINARY PROXY STATEMENT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Information Required in Proxy Statement Schedule 14A Information Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 Filed by the Registrant ☒ Filed by a Party other than the Registrant £ Check the appropriate box: S Preliminary Proxy Statement £ Confidential, for Use of the Commission

Press Release Issued by Nesco Holdings, Inc., dated December 21, 2020

Exhibit 99.1 FOR IMMEDIATE RELEASE NESCO HOLDINGS, INC. RAISES $140 MILLION IN CONNECTION WITH THE PREVIOUSLY ANNOUNCED ACQUISITION OF CUSTOM TRUCK ONE SOURCE Federated Hermes Kaufmann Funds, Wells and Clearbridge among the lead investors in the private placement of common stock Fort Wayne, Ind. – December 21, 2020 – Nesco Holdings, Inc. (NYSE: NSCO, "Nesco" or the "Company") today announced that

- CURRENT REPORT

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): December 21, 2020 NESCO HOLDINGS, INC. (Exact Name of Registrant as Specified in its Charter) Delaware 001-38186 84-2531628 (State or Other Jurisdiction of Incorporation) (Commission

Investor Presentation

Exhibit 99.2