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      </invstOrSec>
      <invstOrSec>
        <name>HSBC Bank USA NA</name>
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        <fairValLevel>2</fairValLevel>
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        <name>Standard Chartered Bank</name>
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        <fairValLevel>2</fairValLevel>
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        <name>UBS AG</name>
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        <name>UBS AG</name>
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        <name>ICE Futures U.S., Inc.</name>
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        <name>Standard Chartered Bank</name>
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        <name>Standard Chartered Bank</name>
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        <name>Standard Chartered Bank</name>
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        <name>Toronto-Dominion Bank</name>
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        <name>Standard Chartered Bank</name>
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        <name>Royal Bank of Canada</name>
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        <name>UBS AG</name>
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        <units>NC</units>
        <currencyConditional curCd="JPY" exchangeRt="144.44500000"/>
        <valUSD>-90.96000000</valUSD>
        <pctVal>-0.00000239554</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>JP</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Morgan Stanley &amp; Co. LLC</counterpartyName>
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            <amtCurSold>2226834.70000000</amtCurSold>
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            <amtCurPur>321642000.00000000</amtCurPur>
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            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>-90.96000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Barclays Bank PLC</name>
        <lei>G5GSEF7VJP5I7OUK5573</lei>
        <title>PURCHASED CHF / SOLD USD</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25FFKBB3F7J"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="CHF" exchangeRt="0.79600000"/>
        <valUSD>25783.28000000</valUSD>
        <pctVal>0.000679035785</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>CH</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Barclays Bank PLC</counterpartyName>
              <counterpartyLei>G5GSEF7VJP5I7OUK5573</counterpartyLei>
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            <amtCurSold>892558.43000000</amtCurSold>
            <curSold>USD</curSold>
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            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>25783.28000000</unrealizedAppr>
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        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
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          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Standard Chartered Bank</name>
        <lei>RILFO74KP1CM8P6PCT96</lei>
        <title>PURCHASED USD / SOLD NOK</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25EUKBB8XXK"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="NOK" exchangeRt="10.11970000"/>
        <valUSD>-221194.99000000</valUSD>
        <pctVal>-0.00582545408</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Standard Chartered Bank</counterpartyName>
              <counterpartyLei>RILFO74KP1CM8P6PCT96</counterpartyLei>
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            <amtCurSold>233619520.00000000</amtCurSold>
            <curSold>NOK</curSold>
            <amtCurPur>22864422.17000000</amtCurPur>
            <curPur>USD</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>-221194.99000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Westpac Banking Corp.</name>
        <lei>EN5TNI6CI43VEPAMHL14</lei>
        <title>PURCHASED USD / SOLD JPY</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25EUKBB8XKS"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="JPY" exchangeRt="144.44500000"/>
        <valUSD>3379731.93000000</valUSD>
        <pctVal>0.089009580109</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Westpac Banking Corp.</counterpartyName>
              <counterpartyLei>EN5TNI6CI43VEPAMHL14</counterpartyLei>
            </counterparties>
            <amtCurSold>112990953610.00000000</amtCurSold>
            <curSold>JPY</curSold>
            <amtCurPur>785621786.76000000</amtCurPur>
            <curPur>USD</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>3379731.93000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>UBS AG</name>
        <lei>BFM8T61CT2L1QCEMIK50</lei>
        <title>PURCHASED USD / SOLD HKD</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25EUKBB363J"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="HKD" exchangeRt="7.85000000"/>
        <valUSD>26492.21000000</valUSD>
        <pctVal>0.000697706367</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>UBS AG</counterpartyName>
              <counterpartyLei>BFM8T61CT2L1QCEMIK50</counterpartyLei>
            </counterparties>
            <amtCurSold>53658000.00000000</amtCurSold>
            <curSold>HKD</curSold>
            <amtCurPur>6861906.22000000</amtCurPur>
            <curPur>USD</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>26492.21000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>JPMorgan Chase Bank NA</name>
        <lei>7H6GLXDRUGQFU57RNE97</lei>
        <title>PURCHASED USD / SOLD EUR</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25EUKBB8XWJ"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="EUR" exchangeRt="0.85189800"/>
        <valUSD>-20341223.03000000</valUSD>
        <pctVal>-0.53571222757</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>JPMorgan Chase Bank NA</counterpartyName>
              <counterpartyLei>7H6GLXDRUGQFU57RNE97</counterpartyLei>
            </counterparties>
            <amtCurSold>557302157.00000000</amtCurSold>
            <curSold>EUR</curSold>
            <amtCurPur>633847608.26000000</amtCurPur>
            <curPur>USD</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>-20341223.03000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bank of Montreal</name>
        <lei>NQQ6HPCNCCU6TUTQYE16</lei>
        <title>PURCHASED EUR / SOLD USD</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25FFKBB3QN1"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="EUR" exchangeRt="0.85189800"/>
        <valUSD>88280.23000000</valUSD>
        <pctVal>0.002324973212</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>XX</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Bank of Montreal</counterpartyName>
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            <amtCurSold>3285363.09000000</amtCurSold>
            <curSold>USD</curSold>
            <amtCurPur>2874000.00000000</amtCurPur>
            <curPur>EUR</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>88280.23000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Bank of Montreal</name>
        <lei>NQQ6HPCNCCU6TUTQYE16</lei>
        <title>PURCHASED USD / SOLD EUR</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25EUKBB7BJJ"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="EUR" exchangeRt="0.85189800"/>
        <valUSD>-2345412.45000000</valUSD>
        <pctVal>-0.06176944848</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Bank of Montreal</counterpartyName>
              <counterpartyLei>NQQ6HPCNCCU6TUTQYE16</counterpartyLei>
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            <amtCurSold>64243000.00000000</amtCurSold>
            <curSold>EUR</curSold>
            <amtCurPur>73066197.86000000</amtCurPur>
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            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>-2345412.45000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>HSBC Bank USA NA</name>
        <lei>1IE8VN30JCEQV1H4R804</lei>
        <title>PURCHASED EUR / SOLD USD</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25FMKBB2J73"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="EUR" exchangeRt="0.85189800"/>
        <valUSD>64522.31000000</valUSD>
        <pctVal>0.001699277883</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>XX</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>HSBC Bank USA NA</counterpartyName>
              <counterpartyLei>1IE8VN30JCEQV1H4R804</counterpartyLei>
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            <amtCurSold>3620191.12000000</amtCurSold>
            <curSold>USD</curSold>
            <amtCurPur>3139000.00000000</amtCurPur>
            <curPur>EUR</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>64522.31000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>State Street Global Advisors</name>
        <lei>549300BZ5TGIFZUZDZ37</lei>
        <title>State Street Institutional US Government Money Market Fund</title>
        <cusip>857492706</cusip>
        <identifiers>
          <isin value="US8574927062"/>
        </identifiers>
        <balance>106399582.74000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>106399582.74000000</valUSD>
        <pctVal>2.802169633482</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</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>
      <invstOrSec>
        <name>Bank of Montreal</name>
        <lei>NQQ6HPCNCCU6TUTQYE16</lei>
        <title>PURCHASED GBP / SOLD USD</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Trade Identifier" value="25FFKBB3QPB"/>
        </identifiers>
        <balance>1.00000000</balance>
        <units>NC</units>
        <currencyConditional curCd="GBP" exchangeRt="0.72974100"/>
        <valUSD>15160.99000000</valUSD>
        <pctVal>0.000399284139</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DFE</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <derivativeInfo>
          <fwdDeriv derivCat="FWD">
            <counterparties>
              <counterpartyName>Bank of Montreal</counterpartyName>
              <counterpartyLei>NQQ6HPCNCCU6TUTQYE16</counterpartyLei>
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            <amtCurSold>1364780.66000000</amtCurSold>
            <curSold>USD</curSold>
            <amtCurPur>1007000.00000000</amtCurPur>
            <curPur>GBP</curPur>
            <settlementDt>2025-07-02</settlementDt>
            <unrealizedAppr>15160.99000000</unrealizedAppr>
          </fwdDeriv>
        </derivativeInfo>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <signature>
      <ncom:dateSigned>2025-07-29</ncom:dateSigned>
      <ncom:nameOfApplicant>STATE STREET INSTITUTIONAL INVESTMENT TRUST</ncom:nameOfApplicant>
      <ncom:signature>Arthur Jensen</ncom:signature>
      <ncom:signerName>Arthur Jensen</ncom:signerName>
      <ncom:title>Deputy Treasurer</ncom:title>
    </signature>
  </formData>
</edgarSubmission>
