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        <name>United States Treasury</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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        <name>Morgan Stanley Capital I Trust</name>
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        <name>Chicago Mercantile Exchange</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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        <name>FHLMC Multifamily Structured Pass Through Certs.</name>
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        <name>United States Treasury</name>
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        <name>United States Treasury</name>
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        <name>United States Treasury</name>
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        <name>United States Treasury</name>
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          <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>United States Treasury</name>
        <lei>254900HROIFWPRGM1V77</lei>
        <title>United States Treasury Inflation Indexed Bonds</title>
        <cusip>912828H45</cusip>
        <identifiers>
          <isin value="US912828H458"/>
        </identifiers>
        <balance>45393028.56000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>43545833.71000000</valUSD>
        <pctVal>2.796294219567</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>UST</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2025-01-15</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>0.25000000</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>1680198.15000000</valUSD>
        <pctVal>0.107893866629</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>0.50000000</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>120171895.80000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>107911781.14000000</valUSD>
        <pctVal>6.929551328252</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>20956195.80000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>1430530.70000000</valUSD>
        <pctVal>0.091861479882</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>1.26000000</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>HOWARD UNIVERSITY</name>
        <lei>N/A</lei>
        <title>Howard University</title>
        <cusip>442851AF8</cusip>
        <identifiers>
          <isin value="US442851AF80"/>
        </identifiers>
        <balance>325000.00000000</balance>
        <units>PA</units>
        <curCd>USD</curCd>
        <valUSD>312471.05000000</valUSD>
        <pctVal>0.020065317768</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>DBT</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <debtSec>
          <maturityDt>2024-10-01</maturityDt>
          <couponKind>Fixed</couponKind>
          <annualizedRt>2.42000000</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>Chicago Mercantile Exchange</name>
        <lei>SNZ2OJLFK8MNNCLQOF39</lei>
        <title>US 10YR NOTE (CBT)SEP23</title>
        <cusip>000000000</cusip>
        <identifiers>
          <other otherDesc="Bloomberg Identifier" value="BBG01BZ6PH61"/>
        </identifiers>
        <balance>599.00000000</balance>
        <units>NC</units>
        <curCd>USD</curCd>
        <valUSD>-1726094.65000000</valUSD>
        <pctVal>-0.11084110880</pctVal>
        <payoffProfile>N/A</payoffProfile>
        <assetCat>DIR</assetCat>
        <issuerConditional desc="derivative" issuerCat="OTHER"/>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <derivativeInfo>
          <futrDeriv derivCat="FUT">
            <counterparties>
              <counterpartyName>Chicago Mercantile Exchange</counterpartyName>
              <counterpartyLei>SNZ2OJLFK8MNNCLQOF39</counterpartyLei>
            </counterparties>
            <payOffProf>Long</payOffProf>
            <descRefInstrmnt>
              <indexBasketInfo>
                <indexName>CBOT 10 Year U.S. Treasury Notes</indexName>
                <indexIdentifier>TYU3 Comdty</indexIdentifier>
              </indexBasketInfo>
            </descRefInstrmnt>
            <expDate>2023-09-20</expDate>
            <notionalAmt>68458438.40000000</notionalAmt>
            <curCd>USD</curCd>
            <unrealizedAppr>-1726094.65000000</unrealizedAppr>
          </futrDeriv>
        </derivativeInfo>
        <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>1239539.22000000</valUSD>
        <pctVal>0.079596968538</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>2023-08-21</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>
