Costar Group Inc. (CSGP)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	68,426,711	$5,421,448,313	0.1%
2.	Blackrock, Inc.	37,457,618	$2,967,767,034	0.06%
3.	Bamco Inc	19,032,522	$1,507,946,718	4.43%
4.	Principal Financial Group Inc	19,007,873	$1,505,993,873	0.85%
5.	State Street Corp	17,574,429	$1,392,422,010	0.06%