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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <name>United States Treasury</name>
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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <title>Freddie Mac Multifamily Structured Pass Through Certificates</title>
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        <name>Morgan Stanley Capital I Trust</name>
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        <name>Brown Brothers Harriman &amp; Co.</name>
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        <name>School District of Philadelphia/The</name>
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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <name>3650R Commercial Mortgage Trust</name>
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        <name>MFS Institutional Money Market Portfolio</name>
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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <title>Freddie Mac Multifamily Structured Pass Through Certificates</title>
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        <name>New Jersey Turnpike Authority</name>
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        <name>HOWARD UNIVERSITY</name>
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        <name>Tobacco Settlement Finance Authority</name>
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          <annualizedRt>6.93000000</annualizedRt>
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          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>91282CDX6</cusip>
        <identifiers>
          <isin value="US91282CDX65"/>
        </identifiers>
        <balance>207710492.08000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>183807559.15000000</valUSD>
        <pctVal>12.08880165393</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2032-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.13000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>912828N71</cusip>
        <identifiers>
          <isin value="US912828N712"/>
        </identifiers>
        <balance>132807381.52000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>128981388.12000000</valUSD>
        <pctVal>8.482950457760</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2026-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.63000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
        <lei>S6XOOCT0IEG5ABCC6L87</lei>
        <title>Freddie Mac Multifamily Structured Pass Through Certificates</title>
        <cusip>3137H5DT1</cusip>
        <identifiers>
          <isin value="US3137H5DT14"/>
        </identifiers>
        <balance>50485813.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1609184.80000000</valUSD>
        <pctVal>0.105834145024</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>ABS-MBS</assetCat>
        <issuerCat>USGSE</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2031-12-25</maturityDt>
          <couponKind>Variable</couponKind>
          <annualizedRt>0.60000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>912828ZZ6</cusip>
        <identifiers>
          <isin value="US912828ZZ63"/>
        </identifiers>
        <balance>172533198.53000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>157216384.40000000</valUSD>
        <pctVal>10.33993213635</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2030-07-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.13000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>BENCHMARK Mortgage Trust</name>
        <lei>N/A</lei>
        <title>Benchmark 2021-B27 Mortgage Trust</title>
        <cusip>08163HAG3</cusip>
        <identifiers>
          <isin value="US08163HAG39"/>
        </identifiers>
        <balance>20903233.61000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1275212.22000000</valUSD>
        <pctVal>0.083869170917</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>ABS-MBS</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2054-07-15</maturityDt>
          <couponKind>Variable</couponKind>
          <annualizedRt>1.38000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>CONSERVATION FUND</name>
        <lei>N/A</lei>
        <title>Conservation Fund A Nonprofit Corp/The</title>
        <cusip>20848FAA8</cusip>
        <identifiers>
          <isin value="US20848FAA84"/>
        </identifiers>
        <balance>1438000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1309848.37000000</valUSD>
        <pctVal>0.086147148761</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2029-12-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>3.47000000</annualizedRt>
          <isDefault>N</isDefault>
          <areIntrstPmntsInArrs>N</areIntrstPmntsInArrs>
          <isPaidKind>N</isPaidKind>
        </debtSec>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="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>2024-03-04</ncom:dateSigned>
      <ncom:nameOfApplicant>MFS SERIES TRUST IX</ncom:nameOfApplicant>
      <ncom:signature>Kasey Phillips</ncom:signature>
      <ncom:signerName>Kasey Phillips</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
