content: <?xml version="1.0" encoding="UTF-8"?><edgarSubmission xmlns="http://www.sec.gov/edgar/ownership" xmlns:com="http://www.sec.gov/edgar/common">
    <!-- Generated by Workiva -->
    <headerData>
      <submissionType>144</submissionType>
      <filerInfo>
        <filer>
          <filerCredentials>
            <cik>0001866541</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001856525</issuerCik>
        <issuerName>Core &amp; Main, Inc.</issuerName>
        <secFileNumber>001-40650</secFileNumber>
        <issuerAddress>
          <com:street1>1830 Craig Park Court</com:street1>
          <com:city>St. Louis</com:city>
          <com:stateOrCountry>MO</com:stateOrCountry>
          <com:zipCode>63146</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>314-432-4700</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>James G. Castellano</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Director</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>JP Morgan Securities LLC</name>
          <address>
            <com:street1>390 Madison Avenue</com:street1>
            <com:street2>6th Floor</com:street2>
            <com:city>New York</com:city>
            <com:stateOrCountry>NY</com:stateOrCountry>
            <com:zipCode>10017</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>25000</noOfUnitsSold>
        <aggregateMarketValue>707500</aggregateMarketValue>
        <noOfUnitsOutstanding>169304578</noOfUnitsOutstanding>
        <approxSaleDate>09/25/2023</approxSaleDate>
        <securitiesExchangeName>NYSE</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
        <acquiredDate>10/29/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Transfer from James G. Castellano, who acquired the shares from Equity incentive award through Core &amp; Main Management Feeder LLC on 01/01/18</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>James G. Castellano</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>20</amountOfSecuritiesAcquired>
        <paymentDate>10/29/2022</paymentDate>
        <natureOfPayment>N/A</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
        <acquiredDate>10/29/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Transfer from James G. Castellano, who acquired the shares from an Investment through Core &amp; Main Management Feeder LLC on 01/01/18</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>James G. Castellano</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>122</amountOfSecuritiesAcquired>
        <paymentDate>10/29/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Class B Common Stock: Partnership Interests (C&amp;M Holdings, LP)</securitiesClassTitle>
        <acquiredDate>10/29/2022</acquiredDate>
        <natureOfAcquisitionTransaction>Transfer from James G. Castellano, who acquired the shares from an Investment through Core &amp; Main Management Feeder LLC on 01/01/18</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>James G. Castellano</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>24858</amountOfSecuritiesAcquired>
        <paymentDate>10/29/2022</paymentDate>
        <natureOfPayment>Cash</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <remarks>Class B Common Stock to be exchanged for Class A Common Stock.  The shares filed today will be sold by the James G. Castellano 2021 Family Trust, James G. Castellano as Trustee.</remarks>
      <noticeSignature>
        <noticeDate>09/25/2023</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>06/26/2023</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for James G. Castellano</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
metadata_documents: [{"type": "144", "sequence": "1", "filename": "primary_doc.xml", "secsgml_size_bytes": 4708}]
text: 144
  0001866541
  XXXXXXXX
  LIVE
  0001856525
  Core & Main, Inc.
  001-40650
  1830 Craig Park Court
  St. Louis
  MO
  63146
  314-432-4700
  James G. Castellano
  Director
  Class A Common Stock
  JP Morgan Securities LLC
  390 Madison Avenue
  6th Floor
  New York
  NY
  10017
  25000
  707500
  169304578
  09/25/2023
  NYSE
  Class A Common Stock
  10/29/2022
  Transfer from James G. Castellano, who acquired the shares from Equity incentive award through Core & Main Management Feeder LLC on 01/01/18
  James G. Castellano
  N
  20
  10/29/2022
  N/A
  Class A Common Stock
  10/29/2022
  Transfer from James G. Castellano, who acquired the shares from an Investment through Core & Main Management Feeder LLC on 01/01/18
  James G. Castellano
  N
  122
  10/29/2022
  Cash
  Class B Common Stock: Partnership Interests (C&M Holdings, LP)
  10/29/2022
  Transfer from James G. Castellano, who acquired the shares from an Investment through Core & Main Management Feeder LLC on 01/01/18
  James G. Castellano
  N
  24858
  10/29/2022
  Cash
  Y
  Class B Common Stock to be exchanged for Class A Common Stock.  The shares filed today will be sold by the James G. Castellano 2021 Family Trust, James G. Castellano as Trustee.
  09/25/2023
  06/26/2023
  /s/ J.P. Morgan Securities LLC as agent and attorney-in-fact for James G. Castellano