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>0001999367</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>Gill Kirsty</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>10000</noOfUnitsSold>
        <aggregateMarketValue>1270000.00</aggregateMarketValue>
        <noOfUnitsOutstanding>1040330497</noOfUnitsOutstanding>
        <approxSaleDate>09/10/2024</approxSaleDate>
        <securitiesExchangeName>NASDAQ</securitiesExchangeName>
      </securitiesInformation>
      <securitiesToBeSold>
        <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
        <acquiredDate>03/01/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>8000</amountOfSecuritiesAcquired>
        <paymentDate>03/01/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <securitiesToBeSold>
        <securitiesClassTitle>American Depositary Shares	</securitiesClassTitle>
        <acquiredDate>05/15/2024</acquiredDate>
        <natureOfAcquisitionTransaction>Restricted Stock Vesting</natureOfAcquisitionTransaction>
        <nameOfPersonfromWhomAcquired>Issuer</nameOfPersonfromWhomAcquired>
        <isGiftTransaction>N</isGiftTransaction>
        <amountOfSecuritiesAcquired>2000</amountOfSecuritiesAcquired>
        <paymentDate>05/15/2024</paymentDate>
        <natureOfPayment>Compensation</natureOfPayment>
      </securitiesToBeSold>
      <nothingToReportFlagOnSecuritiesSoldInPast3Months>N</nothingToReportFlagOnSecuritiesSoldInPast3Months>
      <securitiesSoldInPast3Months>
        <sellerDetails>
          <name>Kirsty Gill</name>
          <address>
            <com:street1>110 Fulbourn Road</com:street1>
            <com:city>Cambridge</com:city>
            <com:stateOrCountry>X0</com:stateOrCountry>
            <com:zipCode>CB1 9NJ</com:zipCode>
          </address>
        </sellerDetails>
        <securitiesClassTitle>American Depositary Shares</securitiesClassTitle>
        <saleDate>06/17/2024</saleDate>
        <amountOfSecuritiesSold>2000</amountOfSecuritiesSold>
        <grossProceeds>320340.00</grossProceeds>
      </securitiesSoldInPast3Months>
      <noticeSignature>
        <noticeDate>09/10/2024</noticeDate>
        <signature>/s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Kirsty Gill</signature>
      </noticeSignature>
    </formData>
  </edgarSubmission>
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text: 144
  0001999367
  XXXXXXXX
  LIVE
  0001973239
  ARM HOLDINGS PLC /UK
  001-41800
  110 FULBOURN ROAD
  CAMBRIDGE
  X0
  CB1 9NJ
  44 1223 400 400
  Gill Kirsty
  Officer
  American Depositary Shares
  Fidelity Brokerage Services LLC
  900 Salem Street
  Smithfield
  RI
  02917
  10000
  1270000.00
  1040330497
  09/10/2024
  NASDAQ
  American Depositary Shares
  03/01/2024
  Restricted Stock Vesting
  Issuer
  N
  8000
  03/01/2024
  Compensation
  American Depositary Shares
  05/15/2024
  Restricted Stock Vesting
  Issuer
  N
  2000
  05/15/2024
  Compensation
  N
  Kirsty Gill
  110 Fulbourn Road
  Cambridge
  X0
  CB1 9NJ
  American Depositary Shares
  06/17/2024
  2000
  320340.00
  09/10/2024
  /s/ Gerardo Ibarra-Munoz, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Kirsty Gill