<?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>0001700262</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>KATHERYN EVANS</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
            <relationshipsToIssuer>
                <relationshipToIssuer>Officer</relationshipToIssuer>
            </relationshipsToIssuer>
        </issuerInfo>
        <securitiesInformation>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <brokerOrMarketmakerDetails>
                <name>E*TRADE FINANCIAL CORPORATION</name>
                <address>
                    <ns2:street1>3 EDISON DRIVE</ns2:street1>
                    <ns2:city>ALPHARETTA</ns2:city>
                    <ns2:stateOrCountry>GA</ns2:stateOrCountry>
                    <ns2:zipCode>30005</ns2:zipCode>
                </address>
            </brokerOrMarketmakerDetails>
            <noOfUnitsSold>17774</noOfUnitsSold>
            <aggregateMarketValue>266610.00</aggregateMarketValue>
            <noOfUnitsOutstanding>135574532</noOfUnitsOutstanding>
            <approxSaleDate>07/11/2023</approxSaleDate>
            <securitiesExchangeName>NASD</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>05/15/2021</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>12586</amountOfSecuritiesAcquired>
            <paymentDate>05/15/2021</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>COMMON</securitiesClassTitle>
            <acquiredDate>02/14/2017</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>ISSUER</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>5188</amountOfSecuritiesAcquired>
            <paymentDate>02/14/2017</paymentDate>
            <natureOfPayment>Not Applicable</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>KATHERYN EVANS</name>
                <address>
                    <ns2:street1>1250 Broadway, 15th Floor</ns2:street1>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10001</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/12/2023</saleDate>
            <amountOfSecuritiesSold>11098</amountOfSecuritiesSold>
            <grossProceeds>149047.25</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>KATHERYN EVANS</name>
                <address>
                    <ns2:street1>1250 Broadway, 15th Floor</ns2:street1>
                    <ns2:city>New York</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>10001</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/17/2023</saleDate>
            <amountOfSecuritiesSold>7450</amountOfSecuritiesSold>
            <grossProceeds>80708.00</grossProceeds>
        </securitiesSoldInPast3Months>
        <noticeSignature>
            <noticeDate>07/11/2023</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>03/13/2023</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Katheryn Evans</signature>
        </noticeSignature>
    </formData>
</edgarSubmission>
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144
0001700262
XXXXXXXX
LIVE
0001595974
MAGNITE, INC.
001-36384
1250 Broadway, 15th Floor
New York
NY
10001
(212) 243-2769
KATHERYN EVANS
Officer
Common
E*TRADE FINANCIAL CORPORATION
3 EDISON DRIVE
ALPHARETTA
GA
30005
17774
266610.00
135574532
07/11/2023
NASD
COMMON
05/15/2021
Restricted Stock
ISSUER
N
12586
05/15/2021
Not Applicable
COMMON
02/14/2017
Restricted Stock
ISSUER
N
5188
02/14/2017
Not Applicable
N
KATHERYN EVANS
1250 Broadway, 15th Floor
New York
NY
10001
Common
06/12/2023
11098
149047.25
KATHERYN EVANS
1250 Broadway, 15th Floor
New York
NY
10001
Common
05/17/2023
7450
80708.00
07/11/2023
03/13/2023
/s/ Katheryn Evans