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        <filer>
          <filerCredentials>
            <cik>0001244276</cik>
            <ccc>XXXXXXXX</ccc>
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        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
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        <issuerCik>0001015328</issuerCik>
        <issuerName>Wintrust  Financial Corporation</issuerName>
        <secFileNumber>001-35077</secFileNumber>
        <issuerAddress>
          <com:street1>9700 West Higgins Road</com:street1>
          <com:city>Rosemont</com:city>
          <com:stateOrCountry>IL</com:stateOrCountry>
          <com:zipCode>60018</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>847-939-9000</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>David A. Dykstra</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Vice Chairman and COO</relationshipToIssuer>
        </relationshipsToIssuer>
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      <securitiesInformation>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Wintrust Investments, LLC</name>
          <address>
            <com:street1>231 S. LaSalle Street, 13th Floor</com:street1>
            <com:city>Chicago</com:city>
            <com:stateOrCountry>IL</com:stateOrCountry>
            <com:zipCode>60604</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>15492</noOfUnitsSold>
        <aggregateMarketValue>1798001.52</aggregateMarketValue>
        <noOfUnitsOutstanding>66500386</noOfUnitsOutstanding>
        <approxSaleDate>10/29/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
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        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/27/2017</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>1860</amountOfSecuritiesAcquired>
        <paymentDate>02/27/2017</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
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      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>01/22/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>871</amountOfSecuritiesAcquired>
        <paymentDate>01/22/2018</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
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      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/27/2018</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2169</amountOfSecuritiesAcquired>
        <paymentDate>02/27/2018</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
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      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>03/04/2019</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3297</amountOfSecuritiesAcquired>
        <paymentDate>03/04/2019</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>02/28/2020</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3855</amountOfSecuritiesAcquired>
        <paymentDate>02/28/2020</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>Common Stock</securitiesClassTitle>
        <acquiredDate>03/03/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Equity Grant</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Wintrust Financial Corporation</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>3440</amountOfSecuritiesAcquired>
        <paymentDate>03/03/2023</paymentDate>
        <natureOfPayment>Equity Grant</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>10/29/2024</noticeDate>
        <signature>/s/David A. Dykstra</signature>
      </noticeSignature>
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text: 144
  0001244276
  XXXXXXXX
  LIVE
  0001015328
  Wintrust  Financial Corporation
  001-35077
  9700 West Higgins Road
  Rosemont
  IL
  60018
  847-939-9000
  David A. Dykstra
  Vice Chairman and COO
  Common Stock
  Wintrust Investments, LLC
  231 S. LaSalle Street, 13th Floor
  Chicago
  IL
  60604
  15492
  1798001.52
  66500386
  10/29/2024
  NASDAQ
  Common Stock
  02/27/2017
  Equity Grant
  Wintrust Financial Corporation
  N
  1860
  02/27/2017
  Equity Grant
  Common Stock
  01/22/2018
  Equity Grant
  Wintrust Financial Corporation
  N
  871
  01/22/2018
  Equity Grant
  Common Stock
  02/27/2018
  Equity Grant
  Wintrust Financial Corporation
  N
  2169
  02/27/2018
  Equity Grant
  Common Stock
  03/04/2019
  Equity Grant
  Wintrust Financial Corporation
  N
  3297
  03/04/2019
  Equity Grant
  Common Stock
  02/28/2020
  Equity Grant
  Wintrust Financial Corporation
  N
  3855
  02/28/2020
  Equity Grant
  Common Stock
  03/03/2023
  Equity Grant
  Wintrust Financial Corporation
  N
  3440
  03/03/2023
  Equity Grant
  Y
  10/29/2024
  /s/David A. Dykstra