<SEC-DOCUMENT>0001969223-24-000741.txt : 20241025
<SEC-HEADER>0001969223-24-000741.hdr.sgml : 20241025
<ACCEPTANCE-DATETIME>20241025165831
ACCESSION NUMBER:		0001969223-24-000741
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20241025
DATE AS OF CHANGE:		20241025

SUBJECT COMPANY:	

	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
		IRS NUMBER:				522091509
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		144
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	000-24531
		FILM NUMBER:		241397700

	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

REPORTING-OWNER:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			KLEIN MICHAEL R
		CENTRAL INDEX KEY:			0001066062
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		2001 K STREET, N.W.
		STREET 2:		SUITE 206
		CITY:			WASHINGTON
		STATE:			DC
		ZIP:			20006
</SEC-HEADER>
<DOCUMENT>
<TYPE>144
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
<XML>
<?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
  <headerData>
    <submissionType>144</submissionType>
    <filerInfo>
      <filer>
        <filerCredentials>
          <cik>0001066062</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001057352</issuerCik>
      <issuerName>CoStar Group, Inc.</issuerName>
      <secFileNumber>000-24531</secFileNumber>
      <issuerAddress>
        <com:street1>1331 L Street NW</com:street1>
        <com:city>Washington</com:city>
        <com:stateOrCountry>DC</com:stateOrCountry>
        <com:zipCode>20005</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>2023466500</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Michael Klein</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>UBS Financial Services Inc</name>
        <address>
          <com:street1>1000 Harbor Blvd</com:street1>
          <com:street2>3rd Floor</com:street2>
          <com:city>Weehawken</com:city>
          <com:stateOrCountry>NJ</com:stateOrCountry>
          <com:zipCode>07086</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>71633</noOfUnitsSold>
      <aggregateMarketValue>5300000</aggregateMarketValue>
      <noOfUnitsOutstanding>409959517</noOfUnitsOutstanding>
      <approxSaleDate>10/25/2024</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/25/1999</acquiredDate>
      <natureOfAcquisitionTransaction>Founder's Shares</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>CoStar Group, Inc.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>73104</amountOfSecuritiesAcquired>
      <paymentDate>05/25/1999</paymentDate>
      <natureOfPayment>wire</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Music Associates of Aspen, Inc.</name>
        <address>
          <com:street1>225 Music School Road Aspen</com:street1>
          <com:city>Aspen</com:city>
          <com:stateOrCountry>CO</com:stateOrCountry>
          <com:zipCode>81611</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>CSGP</securitiesClassTitle>
      <saleDate>08/21/2024</saleDate>
      <amountOfSecuritiesSold>6346</amountOfSecuritiesSold>
      <grossProceeds>477204</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>The Friends of HRDC Foundation</name>
        <address>
          <com:street1>2425 Wyoming Ave NW</com:street1>
          <com:city>Washington</com:city>
          <com:stateOrCountry>DC</com:stateOrCountry>
          <com:zipCode>20008</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>CSGP</securitiesClassTitle>
      <saleDate>10/16/2024</saleDate>
      <amountOfSecuritiesSold>4810</amountOfSecuritiesSold>
      <grossProceeds>376516</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Shakespeare Theatre Company</name>
        <address>
          <com:street1>516 8th St SE</com:street1>
          <com:city>Washington</com:city>
          <com:stateOrCountry>DC</com:stateOrCountry>
          <com:zipCode>20003</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>CSGP</securitiesClassTitle>
      <saleDate>08/26/2024</saleDate>
      <amountOfSecuritiesSold>5344</amountOfSecuritiesSold>
      <grossProceeds>414086</grossProceeds>
    </securitiesSoldInPast3Months>
    <noticeSignature>
      <noticeDate>10/25/2024</noticeDate>
      <signature>/s/ UBS Financial Services Inc, as attorney-in-fact for Michael Klein</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
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</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
