<?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>0001689575</cik>
          <ccc>XXXXXXXX</ccc>
        </filerCredentials>
      </filer>
      <liveTestFlag>LIVE</liveTestFlag>



    </filerInfo>
  </headerData>
  <formData>
    <issuerInfo>
      <issuerCik>0001818331</issuerCik>
      <issuerName>GeneDx Holdings Corp.</issuerName>
      <secFileNumber>001-39482</secFileNumber>
      <issuerAddress>
        <com:street1>333 Ludlow St, North Tower</com:street1>
        <com:street2>6th Floor</com:street2>
        <com:city>Stamford</com:city>
        <com:stateOrCountry>CT</com:stateOrCountry>
        <com:zipCode>06902</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>8887291206</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Katherine Stueland</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Officer</relationshipToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Morgan Stanley Smith Barney</name>
        <address>
          <com:street1>2000 Westchester Avenue</com:street1>
          <com:city>Purchase</com:city>
          <com:stateOrCountry>NY</com:stateOrCountry>
          <com:zipCode>10577</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>94495</noOfUnitsSold>
      <aggregateMarketValue>9268700</aggregateMarketValue>
      <noOfUnitsOutstanding>28904590</noOfUnitsOutstanding>
      <approxSaleDate>01/29/2026</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>05/02/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1653</amountOfSecuritiesAcquired>
      <paymentDate>05/02/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>03/15/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Performance-based Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>26847</amountOfSecuritiesAcquired>
      <paymentDate>03/15/2025</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>12/09/2022</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3686</amountOfSecuritiesAcquired>
      <paymentDate>12/09/2022</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>03/15/2025</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>6712</amountOfSecuritiesAcquired>
      <paymentDate>03/15/2025</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>04/26/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>10557</amountOfSecuritiesAcquired>
      <paymentDate>04/26/2023</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <acquiredDate>03/26/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Acquired as compensation - Restricted Stock Units</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>45040</amountOfSecuritiesAcquired>
      <paymentDate>03/26/2024</paymentDate>
      <natureOfPayment>Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Katherine Stueland</name>
        <address>
          <com:street1>333 Ludlow St, North Tower</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Stamford</com:city>
          <com:stateOrCountry>CT</com:stateOrCountry>
          <com:zipCode>06902</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <saleDate>10/29/2025</saleDate>
      <amountOfSecuritiesSold>2158</amountOfSecuritiesSold>
      <grossProceeds>294654</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Katherine Stueland</name>
        <address>
          <com:street1>333 Ludlow St, North Tower</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Stamford</com:city>
          <com:stateOrCountry>CT</com:stateOrCountry>
          <com:zipCode>06902</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <saleDate>12/09/2025</saleDate>
      <amountOfSecuritiesSold>3639</amountOfSecuritiesSold>
      <grossProceeds>579620</grossProceeds>
    </securitiesSoldInPast3Months>
    <securitiesSoldInPast3Months>
      <sellerDetails>
        <name>Katherine Stueland</name>
        <address>
          <com:street1>333 Ludlow St, North Tower</com:street1>
          <com:street2>6th Floor</com:street2>
          <com:city>Stamford</com:city>
          <com:stateOrCountry>CT</com:stateOrCountry>
          <com:zipCode>06902</com:zipCode>
        </address>
      </sellerDetails>
      <securitiesClassTitle>Class A Common Stock</securitiesClassTitle>
      <saleDate>12/16/2025</saleDate>
      <amountOfSecuritiesSold>10857</amountOfSecuritiesSold>
      <grossProceeds>1562217</grossProceeds>
    </securitiesSoldInPast3Months>
    <remarks>Represents approximately 94,495 shares to be sold on behalf of the Reporting Person, including 1) 1,653 shares to be sold in connection with vesting of RSUs on January 29, 2026; 2) approximately 26,847 shares to be sold in connection with anticipated vesting of PRSUs on or around March 3, 2026; 3) approximately 3,686 shares to be sold in connection with anticipated vesting of RSUs on March 9, 2026; 4) approximately 6,712 shares to be sold in connection with anticipated vesting of RSUs on March 15, 2026; 5) approximately 10,557 shares to be sold in connection with anticipated vesting of RSUs on March 16, 2026; and 6) approximately 45,040 shares to be sold in connection with anticipated vesting of RSUs on March 26, 2026. Shares sold in the past 3 months by the Reporting Person include 16,654 shares sold to cover tax withholding obligations in connection with vesting and settlement of RSUs.</remarks>
    <noticeSignature>
      <noticeDate>01/29/2026</noticeDate>
      <signature>/s/ Katherine Stueland</signature>
    </noticeSignature>
  </formData>
</edgarSubmission>
