<?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>0001296625</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001595974</issuerCik>
            <issuerName>MAGNITE, INC.</issuerName>
            <secFileNumber>001-36384</secFileNumber>
            <issuerAddress>
                <ns2:street1>1250 Broadway, 15th Floor</ns2:street1>
                <ns2:city>New York</ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>10001</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>(212) 243-2769</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>JAMES S ROSSMAN</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Director</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>137007</noOfUnitsSold>
            <aggregateMarketValue>2573139.88</aggregateMarketValue>
            <noOfUnitsOutstanding>141110559</noOfUnitsOutstanding>
            <approxSaleDate>06/18/2025</approxSaleDate>
            <securitiesExchangeName>NASDAQ</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/28/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Exercised Shares</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>112087</amountOfSecuritiesAcquired>
            <paymentDate>07/28/2020</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>04/01/2020</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>11177</amountOfSecuritiesAcquired>
            <paymentDate>04/01/2020</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>06/12/2024</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>13743</amountOfSecuritiesAcquired>
            <paymentDate>06/12/2024</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>06/18/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/10/2025</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ James Steven Rossman</signature>
        </noticeSignature>
    </formData>
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144
0001296625
XXXXXXXX
LIVE
0001595974
MAGNITE, INC.
001-36384
1250 Broadway, 15th Floor
New York
NY
10001
(212) 243-2769
JAMES S ROSSMAN
Director
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
137007
2573139.88
141110559
06/18/2025
NASDAQ
Common
07/28/2020
Exercised Shares
ISSUER
N
112087
07/28/2020
Cash
Common
04/01/2020
Restricted Stock
ISSUER
N
11177
04/01/2020
Not Applicable
Common
06/12/2024
Restricted Stock
ISSUER
N
13743
06/12/2024
Not Applicable
Y
06/18/2025
03/10/2025
/s/ James Steven Rossman