    <SEC-DOCUMENT>0001057352-22-000045-index.html : 20220425
    <SEC-HEADER>0001057352-22-000045.hdr.sgml : 20220425
    <ACCEPTANCE-DATETIME>20220425164110
    ACCESSION NUMBER:		0001057352-22-000045
    CONFORMED SUBMISSION TYPE:	DEF 14A
    PUBLIC DOCUMENT COUNT:		13
    CONFORMED PERIOD OF REPORT:	20220609
    FILED AS OF DATE:		20220425
    DATE AS OF CHANGE:		20220425

    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:		DEF 14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	000-24531
    		FILM NUMBER:		22850212

    	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>DEF 14A
    <SEQUENCE>1
    <FILENAME>a2022proxystatement-def14a.htm
    <DESCRIPTION>DEF 14A
    <TEXT>
    Document 1 - file: a2022proxystatement-def14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>a3a04.jpg
    <TEXT>
    Document 2 - file: a3a04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>acsignaturea04.jpg
    <TEXT>
    Document 3 - file: acsignaturea04.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>ebitda.gif
    <TEXT>
    Document 4 - file: ebitda.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>geneboxerdigitalsigbw.jpg
    <TEXT>
    Document 5 - file: geneboxerdigitalsigbw.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>long-termincentivecomponen.jpg
    <TEXT>
    Document 6 - file: long-termincentivecomponen.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>netincome.gif
    <TEXT>
    Document 7 - file: netincome.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>operatingrevenue.gif
    <TEXT>
    Document 8 - file: operatingrevenue.gif

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>performancepaycharts.jpg
    <TEXT>
    Document 9 - file: performancepaycharts.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>10
    <FILENAME>proxycardback.jpg
    <TEXT>
    Document 10 - file: proxycardback.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>11
    <FILENAME>proxycardfront.jpg
    <TEXT>
    Document 11 - file: proxycardfront.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>12
    <FILENAME>shareholderproposalimage.jpg
    <TEXT>
    Document 12 - file: shareholderproposalimage.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>13
    <FILENAME>variablepaycharta03.jpg
    <TEXT>
    Document 13 - file: variablepaycharta03.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>