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        <name>MFS Institutional Money Market Portfolio</name>
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        <name>Pinnacle West Capital Corp.</name>
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        <valUSD>64577752.53000000</valUSD>
        <pctVal>2.473679779616</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Public Service Enterprise Group, Inc.</name>
        <lei>PUSS41EMO3E6XXNV3U28</lei>
        <title>Public Service Enterprise Group, Inc.</title>
        <cusip>744573106</cusip>
        <identifiers>
          <isin value="US7445731067"/>
        </identifiers>
        <balance>973648.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>74659328.64000000</valUSD>
        <pctVal>2.859859075007</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Sempra</name>
        <lei>PBBKGKLRK5S5C0Y4T545</lei>
        <title>Sempra</title>
        <cusip>816851109</cusip>
        <identifiers>
          <isin value="US8168511090"/>
        </identifiers>
        <balance>1429609.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>126591876.95000000</valUSD>
        <pctVal>4.849158634460</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Southern Co. (The)</name>
        <lei>549300FC3G3YU2FBZD92</lei>
        <title>Southern Co. (The)</title>
        <cusip>842587107</cusip>
        <identifiers>
          <isin value="US8425871071"/>
        </identifiers>
        <balance>1057301.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>99957236.54000000</valUSD>
        <pctVal>3.828906785513</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Spire, Inc.</name>
        <lei>549300NXSY15DRY2R511</lei>
        <title>Spire, Inc.</title>
        <cusip>84857L101</cusip>
        <identifiers>
          <isin value="US84857L1017"/>
        </identifiers>
        <balance>166722.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13314418.92000000</valUSD>
        <pctVal>0.510014789450</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Vistra Corp.</name>
        <lei>549300KP43CPCUJOOG15</lei>
        <title>Vistra Corp.</title>
        <cusip>92840M102</cusip>
        <identifiers>
          <isin value="US92840M1027"/>
        </identifiers>
        <balance>679084.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>100633457.96000000</valUSD>
        <pctVal>3.854809750353</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>WEC Energy Group, Inc.</name>
        <lei>549300IGLYTZUK3PVP70</lei>
        <title>WEC Energy Group, Inc.</title>
        <cusip>92939U106</cusip>
        <identifiers>
          <isin value="US92939U1060"/>
        </identifiers>
        <balance>359950.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>39385729.00000000</valUSD>
        <pctVal>1.508688017401</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Xcel Energy, Inc.</name>
        <lei>LGJNMI9GH8XIDG5RCM61</lei>
        <title>Xcel Energy, Inc.</title>
        <cusip>98389B100</cusip>
        <identifiers>
          <isin value="US98389B1008"/>
        </identifiers>
        <balance>1824279.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>142658617.80000000</valUSD>
        <pctVal>5.464602350104</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>US</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>EDP Renewables SA</name>
        <lei>529900MUFAH07Q1TAX06</lei>
        <title>EDP Renewables SA</title>
        <cusip>N/A</cusip>
        <identifiers>
          <isin value="ES0127797019"/>
        </identifiers>
        <balance>2292191.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="EUR" exchangeRt="0.86718987"/>
        <valUSD>35551578.70000000</valUSD>
        <pctVal>1.361819170197</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>ES</invCountry>

        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>United Utilities Group plc</name>
        <lei>2138002IEYQAOC88ZJ59</lei>
        <title>United Utilities Group plc</title>
        <cusip>N/A</cusip>
        <identifiers>
          <isin value="GB00B39J2M42"/>
        </identifiers>
        <balance>2028592.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="GBP" exchangeRt="0.74197737"/>
        <valUSD>37811702.21000000</valUSD>
        <pctVal>1.448394215117</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>National Grid plc</name>
        <lei>8R95QZMKZLJX5Q2XR704</lei>
        <title>National Grid plc</title>
        <cusip>N/A</cusip>
        <identifiers>
          <isin value="GB00BDR05C01"/>
        </identifiers>
        <balance>1941207.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="GBP" exchangeRt="0.74197737"/>
        <valUSD>31060942.14000000</valUSD>
        <pctVal>1.189803322310</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Orsted A/S</name>
        <lei>W9NG6WMZIYEU8VEDOG48</lei>
        <title>Orsted A/S</title>
        <cusip>N/A</cusip>
        <identifiers>
          <isin value="DK0060094928"/>
        </identifiers>
        <balance>488079.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="DKK" exchangeRt="6.48200000"/>
        <valUSD>10898880.50000000</valUSD>
        <pctVal>0.417486506684</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>DK</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>2</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>EURO</name>
        <lei>N/A</lei>
        <title>EURO</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="ISO Currency code" value="EUR"/>
        </identifiers>
        <balance>77782.85000000</balance>
        <units>OU</units>
        <descOthUnits>Currencies</descOthUnits>
        <currencyConditional curCd="EUR" exchangeRt="0.86718987"/>
        <valUSD>89695.29000000</valUSD>
        <pctVal>0.003435818319</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerConditional desc="Foreign currencies" issuerCat="OTHER"/>
        <invCountry>XX</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>British Pound</name>
        <lei>N/A</lei>
        <title>British Pound</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="ISO Currency code" value="GBP"/>
        </identifiers>
        <balance>60.28000000</balance>
        <units>OU</units>
        <descOthUnits>Currencies</descOthUnits>
        <currencyConditional curCd="GBP" exchangeRt="0.74197737"/>
        <valUSD>81.24000000</valUSD>
        <pctVal>0.000003111934</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerConditional desc="Foreign currencies" issuerCat="OTHER"/>
        <invCountry>GB</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Israeli Shekel</name>
        <lei>N/A</lei>
        <title>Israeli Shekel</title>
        <cusip>N/A</cusip>
        <identifiers>
          <other otherDesc="ISO Currency code" value="ILS"/>
        </identifiers>
        <balance>31027.71000000</balance>
        <units>OU</units>
        <descOthUnits>Currencies</descOthUnits>
        <currencyConditional curCd="ILS" exchangeRt="3.05650000"/>
        <valUSD>10151.39000000</valUSD>
        <pctVal>0.000388853547</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>STIV</assetCat>
        <issuerConditional desc="Foreign currencies" issuerCat="OTHER"/>
        <invCountry>IL</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
    </invstOrSecs>
    <explntrNotes>
      <explntrNote note="All applicable monthly total returns are reported excluding any sales loads or redemption fees for Item B.5." noteItem="B.5.a"/>
    </explntrNotes>
    <signature>
      <ncom:dateSigned>2026-08-31</ncom:dateSigned>
      <ncom:nameOfApplicant>MFS Series Trust VI</ncom:nameOfApplicant>
      <ncom:signature>James Byrne</ncom:signature>
      <ncom:signerName>James Byrne</ncom:signerName>
      <ncom:title>Assistant Treasurer</ncom:title>
    </signature>
  </formData>
  <documents>XXXX</documents>
</edgarSubmission>
