<?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>0001851495</cik>
                    <ccc>XXXXXXXX</ccc>
                </filerCredentials>
            </filer>
            <liveTestFlag>LIVE</liveTestFlag>



        </filerInfo>
    </headerData>
    <formData>
        <issuerInfo>
            <issuerCik>0001637873</issuerCik>
            <issuerName>ACV AUCTIONS INC.</issuerName>
            <secFileNumber>001-40256</secFileNumber>
            <issuerAddress>
                <ns2:street1>640 Ellicott Street, #321</ns2:street1>
                <ns2:city>Buffalo</ns2:city>
                <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                <ns2:zipCode>14203</ns2:zipCode>
            </issuerAddress>
            <issuerContactPhone>8005534070</issuerContactPhone>
            <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>MICHAEL G WATERMAN</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>77196</noOfUnitsSold>
            <aggregateMarketValue>1242855.60</aggregateMarketValue>
            <noOfUnitsOutstanding>171064794</noOfUnitsOutstanding>
            <approxSaleDate>07/08/2025</approxSaleDate>
            <securitiesExchangeName>NYSE</securitiesExchangeName>
        </securitiesInformation>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/08/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Exercise of Stock Options</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>64286</amountOfSecuritiesAcquired>
            <paymentDate>07/08/2025</paymentDate>
            <natureOfPayment>Cash</natureOfPayment>
        </securitiesToBeSold>
        <securitiesToBeSold>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <acquiredDate>07/01/2025</acquiredDate>
            <natureOfAcquisitionTransaction>Restricted Stock Units</natureOfAcquisitionTransaction>
            <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
            <isGiftTransaction>N</isGiftTransaction>
            <amountOfSecuritiesAcquired>12910</amountOfSecuritiesAcquired>
            <paymentDate>07/01/2025</paymentDate>
            <natureOfPayment>N/A</natureOfPayment>
        </securitiesToBeSold>
        <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MICHAEL G WATERMAN</name>
                <address>
                    <ns2:street1>640 Ellicott Street, #321</ns2:street1>
                    <ns2:city>Buffalo</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>14203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>06/10/2025</saleDate>
            <amountOfSecuritiesSold>22171</amountOfSecuritiesSold>
            <grossProceeds>371429.40</grossProceeds>
        </securitiesSoldInPast3Months>
        <securitiesSoldInPast3Months>
            <sellerDetails>
                <name>10b5-1 Sales Plan for MICHAEL G WATERMAN</name>
                <address>
                    <ns2:street1>640 Ellicott Street, #321</ns2:street1>
                    <ns2:city>Buffalo</ns2:city>
                    <ns2:stateOrCountry>NY</ns2:stateOrCountry>
                    <ns2:zipCode>14203</ns2:zipCode>
                </address>
            </sellerDetails>
            <securitiesClassTitle>Common</securitiesClassTitle>
            <saleDate>05/13/2025</saleDate>
            <amountOfSecuritiesSold>223330</amountOfSecuritiesSold>
            <grossProceeds>3795895.34</grossProceeds>
        </securitiesSoldInPast3Months>
        <remarks>The 64,286 securities to be sold will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment will be the dates of exercise/sale.
</remarks>
        <noticeSignature>
            <noticeDate>07/08/2025</noticeDate>
            <planAdoptionDates>
                <planAdoptionDate>12/10/2024</planAdoptionDate>
            </planAdoptionDates>
            <signature>/s/ Michael G Waterman</signature>
        </noticeSignature>
    </formData>
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144
0001851495
XXXXXXXX
LIVE
0001637873
ACV AUCTIONS INC.
001-40256
640 Ellicott Street, #321
Buffalo
NY
14203
8005534070
MICHAEL G WATERMAN
Officer
Common
Morgan Stanley Smith Barney LLC Executive Financial Services
1 New York Plaza
8th Floor
New York
NY
10004
77196
1242855.60
171064794
07/08/2025
NYSE
Common
07/08/2025
Exercise of Stock Options
Issuer
N
64286
07/08/2025
Cash
Common
07/01/2025
Restricted Stock Units
Issuer
N
12910
07/01/2025
N/A
N
10b5-1 Sales Plan for MICHAEL G WATERMAN
640 Ellicott Street, #321
Buffalo
NY
14203
Common
06/10/2025
22171
371429.40
10b5-1 Sales Plan for MICHAEL G WATERMAN
640 Ellicott Street, #321
Buffalo
NY
14203
Common
05/13/2025
223330
3795895.34
The 64,286 securities to be sold will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment will be the dates of exercise/sale.
07/08/2025
12/10/2024
/s/ Michael G Waterman