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  <schemaVersion>X0202</schemaVersion>
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    <submissionType>13F-HR</submissionType>
    <filerInfo>
      <liveTestFlag>LIVE</liveTestFlag>
      <flags>
        <confirmingCopyFlag>false</confirmingCopyFlag>
        <returnCopyFlag>true</returnCopyFlag>
        <overrideInternetFlag>false</overrideInternetFlag>
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      <filer>
        <credentials>
          <cik>0001731509</cik>
          <ccc>XXXXXXXX</ccc>
        </credentials>
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      <periodOfReport>06-30-2025</periodOfReport>
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    <coverPage>
      <reportCalendarOrQuarter>06-30-2025</reportCalendarOrQuarter>
      <isAmendment>false</isAmendment>
      <filingManager>
        <name>SB INVESTMENT ADVISERS (UK) LTD</name>
        <address>
          <ns1:street1>69 GROSVENOR STREET</ns1:street1>
          <ns1:city>LONDON</ns1:city>
          <ns1:stateOrCountry>X0</ns1:stateOrCountry>
          <ns1:zipCode>W1K 3JP</ns1:zipCode>
        </address>
      </filingManager>
      <reportType>13F HOLDINGS REPORT</reportType>
      <form13FFileNumber>028-18608</form13FFileNumber>
      <crdNumber>002818608</crdNumber>
      <secFileNumber>801-108927</secFileNumber>
      <provideInfoForInstruction5>Y</provideInfoForInstruction5>
      <additionalInformation>Certain affiliates of SB Investment Advisers (UK) Limited (SBIA UK), including SoftBank Group Corp.  and SB Investment Advisers (US) Inc., and/or certain of their affiliates are institutional investment  managers that file their own Form 13F with respect to themselves and such affiliates, as applicable.</additionalInformation>
    </coverPage>
    <signatureBlock>
      <name>Casey Rogers</name>
      <title>Chief Compliance Officer (US)</title>
      <phone>650-562-8211</phone>
      <signature>/s/ Casey Rogers</signature>
      <city>Menlo Park,</city>
      <stateOrCountry>CA</stateOrCountry>
      <signatureDate>08-14-2025</signatureDate>
    </signatureBlock>
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            <name>SB INVESTMENT ADVISERS (US) INC.</name>
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