Wesco International Inc (WCC)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Blackrock, Inc.	5,970,222	$1,262,701,975	0.02%
2.	Vanguard Group Inc	4,612,338	$975,509,489	0.01%
3.	Wellington Management Group Llp	3,386,421	$716,228,043	0.13%
4.	Dimensional Fund Advisors Lp	2,220,263	$469,582,104	0.1%
5.	State Street Corp	1,461,821	$309,175,142	0.01%