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        <title>Fidelity Series International Developed Markets Bond Index Fund</title>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
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        <pctVal>32.60059424332</pctVal>
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        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
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        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13143288517.42000000</valUSD>
        <pctVal>49.70743658350</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
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      </invstOrSec>
      <invstOrSec>
        <name>Fidelity Salem Street Trust</name>
        <lei>S4W85DGKOEJ24DPRB829</lei>
        <title>Fidelity Series Long-Term Treasury Bond Index Fund</title>
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        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>1295683337.55000000</valUSD>
        <pctVal>4.900227005457</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>RF</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="As of March 2025, monthly returns presented in Item B.5.a. have been calculated without deducting any applicable sales loads or redemption fees." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2025-07-30</ncom:dateSigned>
      <ncom:nameOfApplicant>Laura M. Del Prato</ncom:nameOfApplicant>
      <ncom:signature>Laura M. Del Prato</ncom:signature>
      <ncom:signerName>Laura M. Del Prato</ncom:signerName>
      <ncom:title>President and Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
