<SEC-DOCUMENT>0000902664-18-002709-index.html : 20180702
<SEC-HEADER>0000902664-18-002709.hdr.sgml : 20180702
<ACCEPTANCE-DATETIME>20180702172253
ACCESSION NUMBER:		0000902664-18-002709
CONFORMED SUBMISSION TYPE:	SC 13D
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180702
DATE AS OF CHANGE:		20180702
GROUP MEMBERS:		BLUE HARBOUR GROUP, LP
GROUP MEMBERS:		BLUE HARBOUR HOLDINGS, LLC
GROUP MEMBERS:		CLIFTON S. ROBBINS

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			WESCO INTERNATIONAL INC
		CENTRAL INDEX KEY:			0000929008
		STANDARD INDUSTRIAL CLASSIFICATION:	WHOLESALE-ELECTRICAL APPARATUS & EQUIPMENT, WIRING SUPPLIES [5063]
		IRS NUMBER:				251723342
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-58085
		FILM NUMBER:		18933987

	BUSINESS ADDRESS:	
		STREET 1:		225 WEST STATION SQUARE DRIVE
		STREET 2:		STE 700
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219
		BUSINESS PHONE:		4124542200

	MAIL ADDRESS:	
		STREET 1:		225 WEST STATION SQUARE DRIVE
		STREET 2:		STE 700
		CITY:			PITTSBURGH
		STATE:			PA
		ZIP:			15219

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CDW HOLDING CORP
		DATE OF NAME CHANGE:	19971217

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Blue Harbour Group, L.P.
		CENTRAL INDEX KEY:			0001325256
		IRS NUMBER:				562457376
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13D

	BUSINESS ADDRESS:	
		STREET 1:		646 STEAMBOAT RD.
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830
		BUSINESS PHONE:		203-422-6560

	MAIL ADDRESS:	
		STREET 1:		646 STEAMBOAT RD.
		CITY:			GREENWICH
		STATE:			CT
		ZIP:			06830

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	Blue Harbour Group, LP
		DATE OF NAME CHANGE:	20050427
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13D
<SEQUENCE>1
<FILENAME>p18-1398sc13d.htm
<DESCRIPTION>WESCO INTERNATIONAL, INC.
<TEXT>
Document 1 - file: p18-1398sc13d.htm

</DOCUMENT>
</SEC-DOCUMENT>