<SEC-DOCUMENT>0001057352-26-000043-index.html : 20260520
<SEC-HEADER>0001057352-26-000043.hdr.sgml : 20260520
<ACCEPTANCE-DATETIME>20260520160146
ACCESSION NUMBER:		0001057352-26-000043
CONFORMED SUBMISSION TYPE:	SD
PUBLIC DOCUMENT COUNT:		4
<RULE>
<RULE-NAME>13p-1
<ITEM>
<ITEM-NUMBER>1.01
<ITEM-PERIOD>20251231
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FILED AS OF DATE:		20260520
DATE AS OF CHANGE:		20260520

FILER:

	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

	FILING VALUES:
		FORM TYPE:		SD
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	000-24531
		FILM NUMBER:		261003844

	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>SD
<SEQUENCE>1
<FILENAME>a2026formsd-05072026_draft.htm
<DESCRIPTION>SD
<TEXT>
Document 1 - file: a2026formsd-05072026_draft.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-1
<SEQUENCE>2
<FILENAME>a2026formsdex101-0507202.htm
<DESCRIPTION>EX-1
<TEXT>
Document 2 - file: a2026formsdex101-0507202.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>a2026formsdex101-0507202001.jpg
<TEXT>
Document 3 - file: a2026formsdex101-0507202001.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>a2026formsdex101-0507202002.jpg
<TEXT>
Document 4 - file: a2026formsdex101-0507202002.jpg

</DOCUMENT>
</SEC-DOCUMENT>