<SEC-DOCUMENT>0001140361-21-011617.txt : 20210405
<SEC-HEADER>0001140361-21-011617.hdr.sgml : 20210405
<ACCEPTANCE-DATETIME>20210405165820
ACCESSION NUMBER:		0001140361-21-011617
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20210401
FILED AS OF DATE:		20210405
DATE AS OF CHANGE:		20210405

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Investment Holdings, LLC
		CENTRAL INDEX KEY:			0001634372
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806224

	BUSINESS ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY
		STREET 2:		360 NORTH CRESCENT DRIVE
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210
		BUSINESS PHONE:		310 712 1195

	MAIL ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY
		STREET 2:		360 NORTH CRESCENT DRIVE
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Capital Partners V, L.P.
		CENTRAL INDEX KEY:			0001778958
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806232

	BUSINESS ADDRESS:	
		STREET 1:		360 NORTH CRESCENT DRIVE
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210
		BUSINESS PHONE:		310-712-1850

	MAIL ADDRESS:	
		STREET 1:		360 NORTH CRESCENT DRIVE
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Investment Holdings IC (Cayman), LLC
		CENTRAL INDEX KEY:			0001756330
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806225

	BUSINESS ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY ADVISORS, LLC
		STREET 2:		360 NORTH CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY ADVISORS, LLC
		STREET 2:		360 NORTH CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity InvestCo, L.P.
		CENTRAL INDEX KEY:			0001756331
		STATE OF INCORPORATION:			E9
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806227

	BUSINESS ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY ADVISORS, LLC
		STREET 2:		360 NORTH CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		C/O PLATINUM EQUITY ADVISORS, LLC
		STREET 2:		360 NORTH CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			90210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum InvestCo (Cayman), LLC
		CENTRAL INDEX KEY:			0001766567
		STATE OF INCORPORATION:			CA

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806226

	BUSINESS ADDRESS:	
		STREET 1:		C/O WALKERS CORPORATE LIMITED
		STREET 2:		27 HOSPITAL ROAD
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9008
		BUSINESS PHONE:		3102289712

	MAIL ADDRESS:	
		STREET 1:		C/O WALKERS CORPORATE LIMITED
		STREET 2:		27 HOSPITAL ROAD
		CITY:			GRAND CAYMAN
		STATE:			E9
		ZIP:			KY1-9008

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			PE One Source Holdings, LLC
		CENTRAL INDEX KEY:			0001855018
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806233

	BUSINESS ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Partners V, LLC
		CENTRAL INDEX KEY:			0001854827
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806230

	BUSINESS ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Investment Holdings V, LLC
		CENTRAL INDEX KEY:			0001854932
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806229

	BUSINESS ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Partners V, L.P.
		CENTRAL INDEX KEY:			0001854950
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806231

	BUSINESS ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Platinum Equity Investment Holdings V Manager, LLC
		CENTRAL INDEX KEY:			0001854967
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-38186
		FILM NUMBER:		21806228

	BUSINESS ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210
		BUSINESS PHONE:		3107121850

	MAIL ADDRESS:	
		STREET 1:		360 N. CRESCENT DRIVE, SOUTH BUILDING
		CITY:			BEVERLY HILLS
		STATE:			CA
		ZIP:			09210

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Custom Truck One Source, Inc.
		CENTRAL INDEX KEY:			0001709682
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-EQUIPMENT RENTAL & LEASING, NEC [7359]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		7701 INDEPENDENCE AVENUE
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64125
		BUSINESS PHONE:		(816) 241-4888

	MAIL ADDRESS:	
		STREET 1:		7701 INDEPENDENCE AVENUE
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64125

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NESCO HOLDINGS, INC.
		DATE OF NAME CHANGE:	20190730

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Capitol Investment Corp. IV
		DATE OF NAME CHANGE:	20170619
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>form4.xml
<DESCRIPTION>FORM 4
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0306</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2021-04-01</periodOfReport>

    <issuer>
        <issuerCik>0001709682</issuerCik>
        <issuerName>Custom Truck One Source, Inc.</issuerName>
        <issuerTradingSymbol>CTOS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001855018</rptOwnerCik>
            <rptOwnerName>PE One Source Holdings, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001778958</rptOwnerCik>
            <rptOwnerName>Platinum Equity Capital Partners V, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001854950</rptOwnerCik>
            <rptOwnerName>Platinum Equity Partners V, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001854827</rptOwnerCik>
            <rptOwnerName>Platinum Equity Partners V, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001854932</rptOwnerCik>
            <rptOwnerName>Platinum Equity Investment Holdings V, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001854967</rptOwnerCik>
            <rptOwnerName>Platinum Equity Investment Holdings V Manager, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001756331</rptOwnerCik>
            <rptOwnerName>Platinum Equity InvestCo, L.P.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001766567</rptOwnerCik>
            <rptOwnerName>Platinum InvestCo (Cayman), LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001756330</rptOwnerCik>
            <rptOwnerName>Platinum Equity Investment Holdings IC (Cayman), LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001634372</rptOwnerCik>
            <rptOwnerName>Platinum Equity Investment Holdings, LLC</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O PLATINUM EQUITY ADVISORS, LLC</rptOwnerStreet1>
            <rptOwnerStreet2>360 NORTH CRESCENT DRIVE, SOUTH BUILDING</rptOwnerStreet2>
            <rptOwnerCity>BEVERLY HILLS</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90210</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isTenPercentOwner>true</isTenPercentOwner>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2021-04-01</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>P</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>148600000</value>
                </transactionShares>
                <transactionPricePerShare>
                    <value>5</value>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>148600000</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>I</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value>See Footnotes</value>
                    <footnoteId id="F1"/>
                    <footnoteId id="F2"/>
                    <footnoteId id="F3"/>
                    <footnoteId id="F4"/>
                    <footnoteId id="F5"/>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Two Forms 4 are being filed, covering a total of twelve (12) reporting persons.  This is the first of the two Forms 4 (the &quot;First Form 4&quot;) and is being filed by each of: (i) PE One Source Holdings, LLC, a Delaware limited liability company (&quot;PE One Source&quot;), (ii) Platinum Equity Capital Partners V, L.P., a Delaware limited partnership (&quot;PECP V&quot;), (iii) Platinum Equity Partners V, L.P., a Delaware limited partnership (&quot;PEP V LP&quot;), (iv) Platinum Equity Partners V, LLC, a Delaware limited liability company (&quot;PEP V LLC&quot;), (v) Platinum Equity Investment Holdings V, LLC, a Delaware limited liability company (&quot;PEIH V&quot;), (vi) Platinum Equity Investment Holdings V Manager, LLC, a Delaware limited liability company (&quot;PEIH V Manager&quot;), (vii) Platinum Equity InvestCo, L.P., a Cayman Islands limited partnership (&quot;PEIC LP&quot;), (viii) Platinum InvestCo (Cayman), LLC, a Cayman Islands limited liability company (&quot;PIC LLC&quot;),</footnote>
        <footnote id="F2">(Continued From Footnote 1) (ix) Platinum Equity Investment Holdings IC (Cayman), LLC, a Delaware limited liability company (&quot;PEIH IC LLC&quot;), and (x) Platinum Equity Investment Holdings, LLC, a Delaware limited liability company (&quot;Platinum Holdings&quot;).  The second of the two Forms 4 (the &quot;Second Form 4&quot;) is being filed by (xi) Platinum Equity, LLC, a Delaware limited liability company (&quot;Platinum Equity,&quot; and together with the entities listed in clauses (i)-(x), the &quot;Platinum Entities,&quot; and (xii) Tom Gores, an individual and citizen of the United States (each person or entity listed in clauses (i)-(xii), a &quot;Reporting Person&quot; and, collectively, the &quot;Reporting Persons&quot;). PE One Source directly owns 148,600,000 shares of common stock, par value $0.0001 per share (the &quot;Shares&quot;), of Custom Truck One Source, Inc. (the &quot;Issuer&quot;).  PECP V holds a majority of the outstanding equity in PE One Source and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PE One Source.</footnote>
        <footnote id="F3">(Continued From Footnote 2) PEP V LP is the general partner of PECP V and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PECP V. PEP V LLC is the general partner of PEP V LP and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PEP V LP. PEIH V holds all of the outstanding equity in PEP V LLC and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PEP V LLC. PEIH V Manager is the sole manager of PEIH V and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PEIH V. PEIC LP holds all of the outstanding equity in PEIH V and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PEIH V. PIC LLC holds a controlling interest in PEIC LP and, accordingly, may be deemed to beneficially own the Shares beneficially owned by PEIC LP. PEIH IC LLC is the general partner of PEIC LP and, accordingly, may be deemed to beneficially own the Shares beneficia</footnote>
        <footnote id="F4">(Continued From Footnote 3) Platinum Equity is the sole member of Platinum Holdings, and PEIH V Manager and, accordingly, may be deemed to beneficially own the Shares beneficially owned by each of Platinum Holdings and PEIH V Manager. Platinum Equity and Tom Gores, together, hold a controlling interest in PIC LLC and may be deemed to beneficially own the Shares beneficially owned by PIC LLC. Tom Gores is the Chairman and Chief Executive Officer of Platinum Equity and, accordingly, may be deemed to beneficially own the Shares beneficially owned by Platinum Equity. Mr. Gores disclaims beneficial ownership of all the Shares held by each of the entities listed above with respect to which he does not have a pecuniary interest. Because of the relationship discussed above, each Reporting Person may be deemed to beneficially own the Shares reported in this Form 4.</footnote>
        <footnote id="F5">Pursuant to Rule 16a-1(a)(4) under the Exchange Act, this filing shall not be deemed an admission that the Reporting Persons are, for purposes of Section 16 of the Exchange Act or otherwise, the beneficial owners of any equity securities in excess of their respective pecuniary interests.</footnote>
    </footnotes>

    <remarks>PE One Source, which is indirectly controlled by Tom Gores as described in footnotes 1-4, is party to an Amended and Restated Stockholders' Agreement with the Issuer (the &quot;Stockholders' Agreement&quot;), which gives PE One Source the right to nominate up to seven (7) directors to the Issuer's board of directors, subject to certain ownership thresholds. Louis Samson, David Wolf, Bryan Kelln and David Glatt serve on the Issuer's board of directors pursuant to this right. Each of Messrs. Kelln and Samson is a Partner, and each of Messrs. Glatt and Wolf is a Managing Director, of Platinum Equity. Accordingly, Messrs. Kelln, Samson, Glatt and Wolf may be determined to represent the interests of the Platinum Entities and Mr. Gores on the board of directors of the Issuer, and accordingly, the Platinum Entities and Mr. Gores may be deemed to be directors for purposes of Section of the Securities Exchange Act of 1934, as amended.</remarks>

    <ownerSignature>
        <signatureName>See Exhibit 99.1 - Signatures</signatureName>
        <signatureDate>2021-04-05</signatureDate>
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