Costar Group Inc. (CSGP)

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Institutional Investors' Holdings

Filing Period:

No.	Name	Shares	Value	% Port
1.	Vanguard Group Inc	70,108,999	$4,714,129,093	0.07%
2.	Blackrock, Inc.	33,970,626	$2,284,184,864	0.04%
3.	State Street Corp	18,632,352	$1,252,839,348	0.04%
4.	Principal Financial Group Inc	17,566,074	$1,181,146,072	0.6%
5.	Baillie Gifford & Co	12,933,185	$869,627,359	0.72%