content: <?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>0001643640</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>
          <com:street1>640 ELLICOTT STREET</com:street1>
          <com:city>BUFFALO</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>14203</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>585-317-0406</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Tribeca Venture Fund II, L.P.</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Affiliate</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Merrill</name>
          <address>
            <com:street1>555 California Street</com:street1>
            <com:street2>Floor 18</com:street2>
            <com:city>San Francisco</com:city>
            <com:stateOrCountry>CA</com:stateOrCountry>
            <com:zipCode>94104</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>79174</noOfUnitsSold>
        <aggregateMarketValue>1364959.76</aggregateMarketValue>
        <noOfUnitsOutstanding>141015776</noOfUnitsOutstanding>
        <approxSaleDate>03/12/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <acquiredDate>08/12/2016</acquiredDate>
        <natureOfAcquisitionTransaction>Private Placement</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>79174</amountOfSecuritiesAcquired>
        <paymentDate>08/12/2016</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/07/2024</saleDate>
        <amountOfSecuritiesSold>29072</amountOfSecuritiesSold>
        <grossProceeds>530297.70</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund New York II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/07/2024</saleDate>
        <amountOfSecuritiesSold>9691</amountOfSecuritiesSold>
        <grossProceeds>176771.98</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/07/2024</saleDate>
        <amountOfSecuritiesSold>50304</amountOfSecuritiesSold>
        <grossProceeds>903606.98</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund New York II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/07/2024</saleDate>
        <amountOfSecuritiesSold>16768</amountOfSecuritiesSold>
        <grossProceeds>301202.33</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/08/2024</saleDate>
        <amountOfSecuritiesSold>181091</amountOfSecuritiesSold>
        <grossProceeds>3315189.48</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund New York II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/08/2024</saleDate>
        <amountOfSecuritiesSold>60364</amountOfSecuritiesSold>
        <grossProceeds>1105069.26</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/11/2024</saleDate>
        <amountOfSecuritiesSold>18039</amountOfSecuritiesSold>
        <grossProceeds>314996.01</grossProceeds>
      </securitiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Tribeca Venture Fund New York II, LP</name>
          <address>
            <com:street1>99 Hudson Street</com:street1>
            <com:street2>Floor 15</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10013</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>Class A</securitiesClassTitle>
        <saleDate>03/11/2024</saleDate>
        <amountOfSecuritiesSold>6013</amountOfSecuritiesSold>
        <grossProceeds>104998.67</grossProceeds>
      </securitiesSoldInPast3Months>
      <remarks>Client has filed a request to generate CIK and CCC for Tribeca Venture Fund II New York, LP. The quantity in this filing is the aggregate amount sold between Tribeca Venture Fund II LP and Tribeca Venture Fund II New York LP. Tribeca Venture Fund II LP - 59,380 Tribeca Venture Fund II New York LP - 19,794</remarks>
      <noticeSignature>
        <noticeDate>03/12/2024</noticeDate>
        <signature>Brian Hirsch</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 8251}]
text: 144
  0001643640
  XXXXXXXX
  LIVE
  0001637873
  ACV Auctions Inc.
  001-40256
  640 ELLICOTT STREET
  BUFFALO
  NY
  14203
  585-317-0406
  Tribeca Venture Fund II, L.P.
  Affiliate
  Class A
  Merrill
  555 California Street
  Floor 18
  San Francisco
  CA
  94104
  79174
  1364959.76
  141015776
  03/12/2024
  NASDAQ
  Class A
  08/12/2016
  Private Placement
  Issuer
  N
  79174
  08/12/2016
  Cash
  N
  Tribeca Venture Fund II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/07/2024
  29072
  530297.70
  Tribeca Venture Fund New York II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/07/2024
  9691
  176771.98
  Tribeca Venture Fund II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/07/2024
  50304
  903606.98
  Tribeca Venture Fund New York II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/07/2024
  16768
  301202.33
  Tribeca Venture Fund II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/08/2024
  181091
  3315189.48
  Tribeca Venture Fund New York II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/08/2024
  60364
  1105069.26
  Tribeca Venture Fund II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/11/2024
  18039
  314996.01
  Tribeca Venture Fund New York II, LP
  99 Hudson Street
  Floor 15
  New York
  NY
  10013
  Class A
  03/11/2024
  6013
  104998.67
  Client has filed a request to generate CIK and CCC for Tribeca Venture Fund II New York, LP. The quantity in this filing is the aggregate amount sold between Tribeca Venture Fund II LP and Tribeca Venture Fund II New York LP. Tribeca Venture Fund II LP - 59,380 Tribeca Venture Fund II New York LP - 19,794
  03/12/2024
  Brian Hirsch