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NUMBER OF

SHARES

BENEFICIALLY

OWNED BY

EACH

REPORTING

PERSON

WITH

SOLE VOTING POWER

382,460

SHARED VOTING POWER

0

SOLE DISPOSITIVE POWER

382,460

SHARED DISPOSITIVE POWER

0

Accession Number:: 0001193125-21-337175
Form Type:: 13D Filing
Publication Date:: 2021-11-22 19:00:00

Filed By:: Blackstone Holdings Iii L.p.
Company:: Custom Truck One Source Inc. (NYSE:CTOS)
Filing Date:: 2021-11-23
SEC Url:: 13D Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Sole Voting Power	Sole Dispositive Power	Aggregate Amount Owned Power	Percent of Class
Blackstone Energy Partners NQ	382,460	382,460	382,460	0.2%
BEP CTOS Holdings	472,446	472,446	472,446	0.2%
Blackstone Energy Family Investment Partnership SMD	45,860	45,860	45,860	0.0%
Blackstone Energy Family Investment Partnership NQ ESC	23,457	23,457	23,457	0.0%
Blackstone Capital Partners VI-NQ	455,487	455,487	455,487	0.2%
BCP CTOS Holdings	466,472	466,472	466,472	0.2%
Blackstone Family Investment Partnership VI-NQ ESC	2,264	2,264	2,264	0.0%
Blackstone Energy Management Associates NQ	854,906	854,906	854,906	0.3%
Blackstone EMA-NQ	854,906	854,906	854,906	0.3%
Blackstone Family GP	45,860	45,860	45,860	0.0%
BEP Side-by-Side GP NQ	23,457	23,457	23,457	0.0%
Blackstone Management Associates VI-NQ	921,959	921,959	921,959	0.4%
BMA VI-NQ	921,959	921,959	921,959	0.4%
Blackstone Holdings III	1,800,322	1,800,322	1,800,322	0.7%
Blackstone Holdings III GP	1,800,322	1,800,322	1,800,322	0.7%
Blackstone Holdings III GP Management	1,800,322	1,800,322	1,800,322	0.7%
BCP VI-NQ Side-by-Side GP	2,264	2,264	2,264	0.0%
Blackstone Holdings II	2,264	2,264	2,264	0.0%
Blackstone Holdings I II GP	2,264	2,264	2,264	0.0%
Blackstone Inc	1,802,586	1,802,586	1,802,586	0.7%
Blackstone Group Management	1,802,586	1,802,586	1,802,586	0.7%
Stephen A. Schwarzman	1,848,446	1,848,446	1,848,446	0.7%

Filing

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, Address and Telephone Number of Person Authorized to Receive Notices and Communications)

November 17, 2021

(Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §§240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check the following box. ☐

Note: Schedules filed in paper format shall include a signed original and five copies of the schedule, including all exhibits. See Rule 13d-7 for other parties to whom copies are to be sent.

*	The remainder of this cover page shall be filled out for a reporting persons initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed to be filed for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Energy Partners NQ L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS BEP CTOS Holdings L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Energy Family Investment Partnership SMD L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Energy Family Investment Partnership NQ ESC L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Capital Partners VI-NQ L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS BCP CTOS Holdings L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Family Investment Partnership VI-NQ ESC L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Energy Management Associates NQ L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone EMA-NQ L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Family GP L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS BEP Side-by-Side GP NQ L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Management Associates VI-NQ L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS BMA VI-NQ L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Holdings III L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Holdings III GP L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Holdings III GP Management L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS BCP VI-NQ Side-by-Side GP L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Holdings II L.P.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Holdings I/II GP L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Inc.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Blackstone Group Management L.L.C.
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION Delaware

CUSIP No. 64083J104


1		NAMES OF REPORTING PERSONS Stephen A. Schwarzman
2		CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (SEE INSTRUCTIONS) (a) ☐ (b) ☒
3		SEC USE ONLY
4		SOURCE OF FUNDS (SEE INSTRUCTIONS) OO
5		CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(D) OR 2(E) ☐
6		CITIZENSHIP OR PLACE OF ORGANIZATION United States

This Amendment No. 1 (Amendment No. 1) amends and supplements the Schedule 13D originally filed with the Securities and Exchange Commission (the SEC) by the Reporting Persons on April 12, 2021 (the Original Schedule 13D, and as amended by Amendment No. 1, the Schedule 13D). Capitalized terms used but not defined herein have the meanings ascribed to them in the Schedule 13D. Except as expressly set forth herein, there have been no changes to the information set forth in the Schedule 13D.

Item 4.

Purpose of Transaction

Item 4 of the Schedule 13D is hereby amended and supplemented by adding the following:

On November 17, 2021, in connection with a registered secondary public offering (the Secondary Offering) of Common Stock, the Issuer, Blackstone Energy Partners NQ L.P., a Delaware limited partnership, BEP CTOS Holdings L.P., a Delaware limited partnership, Blackstone Energy Family Investment Partnership SMD L.P., a Delaware limited partnership, Blackstone Energy Family Investment Partnership NQ ESC L.P., a Delaware limited partnership, Blackstone Capital Partners VI-NQ L.P., a Delaware limited partnership, BCP CTOS Holdings L.P., a Delaware limited partnership, and Blackstone Family Investment Partnership VI-NQ ESC L.P., a Delaware limited partnership (collectively, the Blackstone Funds) and the underwriters party thereto (the Underwriters), entered into an underwriting agreement (the Underwriting Agreement) pursuant to which the Blackstone Funds agreed to sell to the Underwriters, and the Underwriters agreed to purchase from the Blackstone Funds, subject to and upon the terms and conditions set forth therein, 12,322,975 shares of Common Stock at a price of $8.50 share. The Blackstone Funds also granted the Underwriters a 30-day option (the Over-allotment Option) to purchase up to 1,848,446 shares of Common Stock at a price to the public of $8.50 per share, with net proceeds to the Blackstone funds of $8.2025 per share. The Underwriters have not yet exercised their Over-allotment Option, and the Blackstone Funds completed the Secondary Offering on November 22, 2021.

Pursuant to the Underwriting Agreement, the Blackstone Funds have entered into a lock-up agreement (the Lock-Up Agreement) with the Underwriters pursuant to which each has agreed with the Underwriters, subject to customary exceptions, not to offer, sell, contract to sell, pledge, grant any option to purchase, make any short sale or otherwise dispose of any shares of Common Stock, or any options or warrants to purchase any shares of Common Stock, or any securities convertible into, exchangeable for or that represent the right to receive shares of Common Stock during the period from November 17, 2021 continuing through the date 60 days thereafter, other than shares of Common Stock disposed of as bona fide gifts approved by Citigroup Global Markets Inc. The foregoing descriptions of the Underwriting Agreement and the Lock-Up Agreement set forth in this Item 4 do not purport to be complete and are qualified in their entirety by reference to the full text of the Underwriting Agreement and the Lock-Up Agreement, which have been filed as Exhibit C and Exhibit D hereto and are incorporated herein by reference.

(d) To the best knowledge of the Reporting Persons, no one other than the Reporting Persons, or the partners, members, affiliates or shareholders of the Reporting Persons, has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Common Stock reported herein as beneficially owned by the Reporting Persons.

(e) Not applicable.

Item 6.

Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer

Item 6 of the Schedule 13D is hereby amended and supplemented by adding the following information:

The information set forth in Item 4 of this Amendment No. 1 is incorporated by reference into this Item 6.

Due to the fact that the Reporting Persons no longer beneficially own more than 4.5% of the outstanding shares of Common Stock as of November 22, 2021, as of such date the Reporting Persons rights under the Stockholders Agreement have terminated. As a consequence of such termination, the Reporting Persons no longer have a right to designate a candidate for election to the Issuers board of directors at the next applicable stockholders meeting of the Issuer.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Dated: November 22, 2021


BLACKSTONE ENERGY PARTNERS NQ L.P.
By: Blackstone Energy Management Associates NQ L.L.C., its general partner
By: Blackstone EMA-NQ L.L.C., its managing member

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

BEP CTOS HOLDINGS L.P.
By: Blackstone Energy Management Associates NQ L.L.C., its general partner
By: Blackstone EMA-NQ L.L.C., its managing member

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

BLACKSTONE ENERGY FAMILY INVESTMENT PARTNERSHIP SMD L.P.
By: Blackstone Family GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE ENERGY FAMILY INVESTMENT PARTNERSHIP NQ ESC L.P.
By: BEP Side-by-Side GP NQ L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

BLACKSTONE CAPITAL PARTNERS VI-NQ L.P.
By: Blackstone Management Associates VI-NQ L.L.C., its general partner
By: BMA VI-NQ L.L.C., its managing member

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

[Custom Truck One Source, Inc. Schedule 13D/A]

BCP CTOS HOLDINGS L.P.

By: Blackstone Management Associates VI-NQ L.L.C., its general partner

By: BMA VI-NQ L.L.C., its managing member

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

BLACKSTONE ENERGY MANAGEMENT ASSOCIATES NQ L.L.C.

By: Blackstone EMA-NQ L.L.C., its managing member

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

BLACKSTONE EMA-NQ L.L.C.

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

BLACKSTONE FAMILY GP L.L.C.

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Senior Managing Director

BEP SIDE-BY-SIDE GP NQ L.L.C.

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

BLACKSTONE MANAGEMENT ASSOCIATES VI-NQ L.L.C.

By: BMA VI-NQ L.L.C., its managing member

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

BMA VI-NQ L.L.C.

By: /s/ Tabea Hsi

Name: Tabea Hsi

Title: Authorized Person

[Custom Truck One Source, Inc. Schedule 13D/A]


BLACKSTONE FAMILY INVESTMENT PARTNERSHIP VI-NQ ESC L.P.
By: BCP VI-NQ Side-by-Side GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

BCP VI-NQ SIDE-BY-SIDE GP L.L.C.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Authorized Person

BLACKSTONE HOLDINGS II L.P.
By: Blackstone Holdings I/II GP L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE HOLDINGS I/II GP L.L.C.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

[Custom Truck One Source, Inc. Schedule 13D/A]


BLACKSTONE HOLDINGS III L.P.
By: Blackstone Holdings III GP L.P., its general partner
By: Blackstone Holdings III GP Management L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE HOLDINGS III GP L.P.
By: Blackstone Holdings III GP Management L.L.C., its general partner

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE HOLDINGS III GP MANAGEMENT L.L.C.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE INC.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

BLACKSTONE GROUP MANAGEMENT L.L.C.

By:		/s/ Tabea Hsi
Name: Tabea Hsi
Title: Senior Managing Director

/s/ Stephen A. Schwarzman
Stephen A. Schwarzman

[Custom Truck One Source, Inc. Schedule 13D/A]