<SEC-DOCUMENT>0001950047-25-005215.txt : 20250728
<SEC-HEADER>0001950047-25-005215.hdr.sgml : 20250728
<ACCEPTANCE-DATETIME>20250728161015
ACCESSION NUMBER:		0001950047-25-005215
CONFORMED SUBMISSION TYPE:	144
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20250728
DATE AS OF CHANGE:		20250728

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
		EIN:				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:		251155683

	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:			SAINT FREDERICK G.
		CENTRAL INDEX KEY:			0001500076
		ORGANIZATION NAME:           	

	FILING VALUES:
		FORM TYPE:		144

	MAIL ADDRESS:	
		STREET 1:		LOOPNET, INC.
		STREET 2:		181 W. HUNTINGTON DRIVE, SUITE 208
		CITY:			MONROVIA
		STATE:			CA
		ZIP:			91016
</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:ns2="http://www.sec.gov/edgar/common">
    <headerData>
        <submissionType>144</submissionType>
        <filerInfo>
            <filer>
                <filerCredentials>
                    <cik>0001500076</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>
                <ns2:street1>1201 Wilson Blvd</ns2:street1>
                <ns2:city>Arlington</ns2:city>
                <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                <ns2:zipCode>22209</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(202) 346-6500</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>FREDERICK SAINT</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>Morgan Stanley Smith Barney LLC Executive Financial Services</name>
                <address>
                    <ns2:street1>1 New York Plaza</ns2:street1>
                    <ns2:street2>8th Floor</ns2:street2>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10004</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>25000</noOfUnitsSold>
            <aggregateMarketValue>2330827.50</aggregateMarketValue>
            <noOfUnitsOutstanding>423650362</noOfUnitsOutstanding>
            <approxSaleDate>07/28/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/15/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>8750</amountOfSecuritiesAcquired>
            <paymentDate>02/15/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>02/28/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>250</amountOfSecuritiesAcquired>
            <paymentDate>02/28/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/01/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>3920</amountOfSecuritiesAcquired>
            <paymentDate>04/01/2020</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>03/01/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Performance Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>12080</amountOfSecuritiesAcquired>
            <paymentDate>03/01/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FREDERICK SAINT</name>
                <address>
                    <ns2:street1>1201 Wilson Blvd</ns2:street1>
                    <ns2:city>Arlington</ns2:city>
                    <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                    <ns2:zipCode>22209</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/11/2025</saleDate>
            <amountOfSecuritiesSold>4860</amountOfSecuritiesSold>
            <grossProceeds>394123.16</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FREDERICK SAINT</name>
                <address>
                    <ns2:street1>1201 Wilson Blvd</ns2:street1>
                    <ns2:city>Arlington</ns2:city>
                    <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                    <ns2:zipCode>22209</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/11/2025</saleDate>
            <amountOfSecuritiesSold>15820</amountOfSecuritiesSold>
            <grossProceeds>1282927.65</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>FREDERICK SAINT</name>
                <address>
                    <ns2:street1>1201 Wilson Blvd</ns2:street1>
                    <ns2:city>Arlington</ns2:city>
                    <ns2:stateOrCountry>VA</ns2:stateOrCountry>
                    <ns2:zipCode>22209</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/11/2025</saleDate>
            <amountOfSecuritiesSold>4320</amountOfSecuritiesSold>
            <grossProceeds>350331.70</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>07/28/2025</noticeDate>
            <planAdoptionDates/>
            <signature>/s/ Frederick G. Saint</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
