<SEC-DOCUMENT>0001717178-26-000002-index.html : 20260218
<SEC-HEADER>0001717178-26-000002.hdr.sgml : 20260218
<ACCEPTANCE-DATETIME>20260218160539
ACCESSION NUMBER:		0001717178-26-000002
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		4
CONFORMED PERIOD OF REPORT:	20260215
FILED AS OF DATE:		20260218
DATE AS OF CHANGE:		20260218

REPORTING-OWNER:	

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

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24531
		FILM NUMBER:		26648216

	MAIL ADDRESS:	
		STREET 1:		C/O COSTAR GROUP, INC.
		STREET 2:		1201 WILSON BLVD.
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22209

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			COSTAR GROUP, INC.
		CENTRAL INDEX KEY:			0001057352
		STANDARD INDUSTRIAL CLASSIFICATION:	SERVICES-BUSINESS SERVICES, NEC [7389]
		ORGANIZATION NAME:           	07 Trade & Services
		EIN:				522091509
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	BUSINESS ADDRESS:	
		STREET 1:		1201 WILSON BLVD.
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22209
		BUSINESS PHONE:		2023466500

	MAIL ADDRESS:	
		STREET 1:		1201 WILSON BLVD.
		CITY:			ARLINGTON
		STATE:			VA
		ZIP:			22209

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COSTAR GROUP INC
		DATE OF NAME CHANGE:	19990805
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>wk-form4_1771448733.xml
<DESCRIPTION>FORM 4
<TEXT>
Document 1 - file: wk-form4_1771448733.html

Document 1 - RAW XML: wk-form4_1771448733.xml

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-24
<SEQUENCE>2
<FILENAME>exhibit24ruggles.htm
<DESCRIPTION>EX-24
<TEXT>
Document 2 - file: exhibit24ruggles.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>exhibit24ruggles001.jpg
<TEXT>
Document 3 - file: exhibit24ruggles001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>exhibit24ruggles002.jpg
<TEXT>
Document 4 - file: exhibit24ruggles002.jpg

</DOCUMENT>
</SEC-DOCUMENT>