Wesco International Inc (WCC)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	4,607,114	$715,484,805	0.01%
2.	Blackrock, Inc.	4,453,880	$691,687,573	0.01%
3.	Dimensional Fund Advisors Lp	2,142,201	$332,677,292	0.08%
4.	Wellington Management Group Llp	1,481,370	$230,056,763	0.04%
5.	State Street Corp	1,368,143	$212,472,608	0.01%