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      <filer>
        <filerCredentials>
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          <ccc>XXXXXXXX</ccc>
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      <liveTestFlag>LIVE</liveTestFlag>



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    <issuerInfo>
      <issuerCik>0000947484</issuerCik>
      <issuerName>ARCH CAPITAL GROUP LTD.</issuerName>
      <secFileNumber>001-16209</secFileNumber>
      <issuerAddress>
        <com:street1>WATERLOO HOUSE, GROUND FLOOR</com:street1>
        <com:street2>100 PITTS BAY ROAD</com:street2>
        <com:city>PEMBROKE</com:city>
        <com:stateOrCountry>D0</com:stateOrCountry>
        <com:zipCode>HM 08</com:zipCode>
      </issuerAddress>
      <issuerContactPhone>441-278-9250</issuerContactPhone>
      <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>PASQUESI JOHN M</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
      <relationshipsToIssuer>
        <relationshipToIssuer>Director</relationshipToIssuer>
        <relationshipToIssuer>CHAIR</relationshipToIssuer>
      </relationshipsToIssuer>
    </issuerInfo>
    <securitiesInformation>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <brokerOrMarketmakerDetails>
        <name>Charles Schwab &amp; Co., Inc.</name>
        <address>
          <com:street1>3000 Schwab Way</com:street1>
          <com:city>Westlake</com:city>
          <com:stateOrCountry>TX</com:stateOrCountry>
          <com:zipCode>76262</com:zipCode>
        </address>
      </brokerOrMarketmakerDetails>
      <noOfUnitsSold>23996</noOfUnitsSold>
      <aggregateMarketValue>2272940.00</aggregateMarketValue>
      <noOfUnitsOutstanding>374754525</noOfUnitsOutstanding>
      <approxSaleDate>05/13/2025</approxSaleDate>
      <securitiesExchangeName>NASDAQ</securitiesExchangeName>
    </securitiesInformation>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/01/2019</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ARCH CAPITAL GROUP LTD.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>3588</amountOfSecuritiesAcquired>
      <paymentDate>05/01/2019</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/07/2020</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ARCH CAPITAL GROUP LTD.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>10116</amountOfSecuritiesAcquired>
      <paymentDate>05/07/2020</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/04/2023</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ARCH CAPITAL GROUP LTD.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>6070</amountOfSecuritiesAcquired>
      <paymentDate>05/04/2023</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/04/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ARCH CAPITAL GROUP LTD.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>1714</amountOfSecuritiesAcquired>
      <paymentDate>05/04/2024</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <securitiesToBeSold>
      <securitiesClassTitle>Common</securitiesClassTitle>
      <acquiredDate>05/09/2024</acquiredDate>
      <natureOfAcquisitionTransaction>Restricted Stock Lapse</natureOfAcquisitionTransaction>
      <nameOfPersonfromWhomAcquired>ARCH CAPITAL GROUP LTD.</nameOfPersonfromWhomAcquired>
      <isGiftTransaction>N</isGiftTransaction>
      <amountOfSecuritiesAcquired>2508</amountOfSecuritiesAcquired>
      <paymentDate>05/09/2024</paymentDate>
      <natureOfPayment>Equity Compensation</natureOfPayment>
    </securitiesToBeSold>
    <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
    <remarks>Shares sold in THE PASQUESI REV TRUST.</remarks>
    <noticeSignature>
      <noticeDate>05/13/2025</noticeDate>
      <signature>JOHN M PASQUESI TTEE</signature>
    </noticeSignature>
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144
0001227099
XXXXXXXX
LIVE
0000947484
ARCH CAPITAL GROUP LTD.
001-16209
WATERLOO HOUSE, GROUND FLOOR
100 PITTS BAY ROAD
PEMBROKE
D0
HM 08
441-278-9250
PASQUESI JOHN M
Director
CHAIR
Common
Charles Schwab & Co., Inc.
3000 Schwab Way
Westlake
TX
76262
23996
2272940.00
374754525
05/13/2025
NASDAQ
Common
05/01/2019
Restricted Stock Lapse
ARCH CAPITAL GROUP LTD.
N
3588
05/01/2019
Equity Compensation
Common
05/07/2020
Restricted Stock Lapse
ARCH CAPITAL GROUP LTD.
N
10116
05/07/2020
Equity Compensation
Common
05/04/2023
Restricted Stock Lapse
ARCH CAPITAL GROUP LTD.
N
6070
05/04/2023
Equity Compensation
Common
05/04/2024
Restricted Stock Lapse
ARCH CAPITAL GROUP LTD.
N
1714
05/04/2024
Equity Compensation
Common
05/09/2024
Restricted Stock Lapse
ARCH CAPITAL GROUP LTD.
N
2508
05/09/2024
Equity Compensation
Y
Shares sold in THE PASQUESI REV TRUST.
05/13/2025
JOHN M PASQUESI TTEE