    <SEC-DOCUMENT>0001709682-26-000032-index.html : 20260429
    <SEC-HEADER>0001709682-26-000032.hdr.sgml : 20260429
    <ACCEPTANCE-DATETIME>20260428190726
    ACCESSION NUMBER:		0001709682-26-000032
    CONFORMED SUBMISSION TYPE:	ARS
    PUBLIC DOCUMENT COUNT:		1
    CONFORMED PERIOD OF REPORT:	20251231
    FILED AS OF DATE:		20260429
    DATE AS OF CHANGE:		20260428
    EFFECTIVENESS DATE:		20260429

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			Custom Truck One Source, Inc.
    		CENTRAL INDEX KEY:			0001709682
    		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-EQUIPMENT RENTAL & LEASING, NEC [7359]
    		ORGANIZATION NAME:           	07 Trade & Services
    		EIN:				000000000
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		ARS
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-38186
    		FILM NUMBER:		26909869

    	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>ARS
    <SEQUENCE>1
    <FILENAME>a2025form10kandwrap.pdf
    <DESCRIPTION>ARS
    <TEXT>
    Document 1 - file: a2025form10kandwrap.pdf

    </DOCUMENT>
    </SEC-DOCUMENT>