Costar Group Inc. (CSGP)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	65,717,391	$4,704,708,022	0.08%
2.	Blackrock, Inc.	38,115,694	$2,728,702,541	0.05%
3.	Bamco Inc	19,203,564	$1,374,783,147	3.55%
4.	Principal Financial Group Inc	19,186,275	$1,373,545,506	0.74%
5.	State Street Corp	17,031,876	$1,219,357,437	0.04%