<SEC-DOCUMENT>0001057352-17-000069-index.html : 20170919
<SEC-HEADER>0001057352-17-000069.hdr.sgml : 20170919
<ACCEPTANCE-DATETIME>20170919164706
ACCESSION NUMBER:		0001057352-17-000069
CONFORMED SUBMISSION TYPE:	3
PUBLIC DOCUMENT COUNT:		2
CONFORMED PERIOD OF REPORT:	20170913
FILED AS OF DATE:		20170919
DATE AS OF CHANGE:		20170919

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Ruggles Lisa
		CENTRAL INDEX KEY:			0001717178

	FILING VALUES:
		FORM TYPE:		3
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24531
		FILM NUMBER:		171092409

	MAIL ADDRESS:	
		STREET 1:		C/O COSTAR GROUP, INC.
		STREET 2:		1331 L STREET NW
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20005

ISSUER:		

	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

	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
</SEC-HEADER>
<DOCUMENT>
<TYPE>3
<SEQUENCE>1
<FILENAME>wf-form3_150585401237435.xml
<DESCRIPTION>FORM 3
<TEXT>
Document 1 - file: wf-form3_150585401237435.html

Document 1 - RAW XML: wf-form3_150585401237435.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>limitedpowerofattorney-sec.htm
<DESCRIPTION>POWER OF ATTORNEY
<TEXT>
Document 2 - file: limitedpowerofattorney-sec.htm

</DOCUMENT>
</SEC-DOCUMENT>