<SEC-DOCUMENT>0000900973-18-000007-index.html : 20180214
<SEC-HEADER>0000900973-18-000007.hdr.sgml : 20180214
<ACCEPTANCE-DATETIME>20180213192020
ACCESSION NUMBER:		0000900973-18-000007
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180214
DATE AS OF CHANGE:		20180213

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COSTAR GROUP INC
		CENTRAL INDEX KEY:			0001057352
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		IRS NUMBER:				522091509
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-54369
		FILM NUMBER:		18606126

	BUSINESS ADDRESS:	
		STREET 1:		1331 L STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20005
		BUSINESS PHONE:		2023466500

	MAIL ADDRESS:	
		STREET 1:		1331 L STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20005

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Winslow Capital Management, LLC
		CENTRAL INDEX KEY:			0000900973
		IRS NUMBER:				900860898
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		4400 IDS CENTER
		STREET 2:		80 SOUTH 8TH ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402
		BUSINESS PHONE:		6123769122

	MAIL ADDRESS:	
		STREET 1:		4400 IDS CENTER
		STREET 2:		80 SOUTH 8TH ST
		CITY:			MINNEAPOLIS
		STATE:			MN
		ZIP:			55402

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	WINSLOW CAPITAL MANAGEMENT INC /MN
		DATE OF NAME CHANGE:	19990322
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>sc13gcsgp123117.txt
<TEXT>
Document 1 - file: sc13gcsgp123117.txt

</DOCUMENT>
</SEC-DOCUMENT>