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>0001533913</cik>
            <ccc>XXXXXXXX</ccc>
          </filerCredentials>
        </filer>
        <liveTestFlag>LIVE</liveTestFlag>
  
  
  
      </filerInfo>
    </headerData>
    <formData>
      <issuerInfo>
        <issuerCik>0001973239</issuerCik>
        <issuerName>ARM HOLDINGS PLC /UK</issuerName>
        <secFileNumber>001-41800</secFileNumber>
        <issuerAddress>
          <com:street1>110 FULBOURN ROAD</com:street1>
          <com:city>CAMBRIDGE</com:city>
          <com:stateOrCountry>X0</com:stateOrCountry>
          <com:zipCode>CB1 9NJ</com:zipCode>
        </issuerAddress>
        <issuerContactPhone>44 1223 400 400</issuerContactPhone>
        <nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>Child Jason</nameOfPersonForWhoseAccountTheSecuritiesAreToBeSold>
        <relationshipsToIssuer>
          <relationshipToIssuer>Officer</relationshipToIssuer>
        </relationshipsToIssuer>
      </issuerInfo>
      <securitiesInformation>
        <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
        <brokerOrMarketmakerDetails>
          <name>Fidelity Brokerage Services LLC</name>
          <address>
            <com:street1>900 Salem Street</com:street1>
            <com:city>Smithfield</com:city>
            <com:stateOrCountry>RI</com:stateOrCountry>
            <com:zipCode>02917</com:zipCode>
          </address>
        </brokerOrMarketmakerDetails>
        <noOfUnitsSold>20160</noOfUnitsSold>
        <aggregateMarketValue>2993760.00</aggregateMarketValue>
        <noOfUnitsOutstanding>1040330497</noOfUnitsOutstanding>
        <approxSaleDate>11/08/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
        <acquiredDate>10/04/2023</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>20160</amountOfSecuritiesAcquired>
        <paymentDate>10/04/2023</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>Y</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>11/08/2024</noticeDate>
        <planAdoptionDates>
          <planAdoptionDate>08/09/2024</planAdoptionDate>
        </planAdoptionDates>
        <signature>/s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jason E Child</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001533913
  XXXXXXXX
  LIVE
  0001973239
  ARM HOLDINGS PLC /UK
  001-41800
  110 FULBOURN ROAD
  CAMBRIDGE
  X0
  CB1 9NJ
  44 1223 400 400
  Child Jason
  Officer
  American Depositary Shares
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  20160
  2993760.00
  1040330497
  11/08/2024
  NASDAQ
  American Depositary Shares
  10/04/2023
  Restricted Stock Vesting
  Issuer
  N
  20160
  10/04/2023
  Compensation
  Y
  11/08/2024
  08/09/2024
  /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Jason E Child