Costar Group Inc. (CSGP)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	64,909,799	$5,672,467,334	0.12%
2.	Blackrock Inc.	36,527,891	$3,192,172,399	0.08%
3.	Principal Financial Group Inc	19,805,733	$1,730,823,051	1.1%
4.	Bamco Inc	19,391,283	$1,694,604,221	4.51%
5.	State Street Corp	15,816,290	$1,382,185,583	0.06%