<SEC-DOCUMENT>0001057352-23-000079-index.html : 20230427
<SEC-HEADER>0001057352-23-000079.hdr.sgml : 20230427
<ACCEPTANCE-DATETIME>20230427165526
ACCESSION NUMBER:		0001057352-23-000079
CONFORMED SUBMISSION TYPE:	ARS
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20221231
FILED AS OF DATE:		20230427
DATE AS OF CHANGE:		20230427
EFFECTIVENESS DATE:		20230427

FILER:

	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:		ARS
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24531
		FILM NUMBER:		23858130

	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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	COSTAR GROUP INC
		DATE OF NAME CHANGE:	19990805
</SEC-HEADER>
<DOCUMENT>
<TYPE>ARS
<SEQUENCE>1
<FILENAME>a2023annualreportforedgar.pdf
<DESCRIPTION>ARS
<TEXT>
Document 1 - file: a2023annualreportforedgar.pdf

</DOCUMENT>
</SEC-DOCUMENT>