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      <invstOrSec>
        <name>CDW Corp/DE</name>
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      <invstOrSec>
        <name>Tyler Technologies Inc</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Microsoft Corp</name>
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        <fairValLevel>1</fairValLevel>
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      <invstOrSec>
        <name>Applied Materials Inc</name>
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      <invstOrSec>
        <name>NVIDIA Corp</name>
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      <invstOrSec>
        <name>Adobe Inc</name>
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        <name>Gartner Inc</name>
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        <name>Guidewire Software Inc</name>
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        <name>Palantir Technologies Inc</name>
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        <name>Marvell Technology Inc</name>
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        <name>Cadence Design Systems Inc</name>
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        <name>Broadcom Inc</name>
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        <name>Descartes Systems Group Inc/The</name>
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        <name>Topicus.com Inc</name>
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        <name>Arista Networks Inc</name>
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        <name>MFS Institutional Money Market Portfolio</name>
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        <name>ServiceNow Inc</name>
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        <name>FactSet Research Systems Inc</name>
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        <name>Analog Devices Inc</name>
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        <name>Snowflake Inc</name>
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        <name>Meta Platforms Inc</name>
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        <name>Oracle Corp</name>
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        <name>Aon PLC</name>
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        <name>Datadog Inc</name>
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      </invstOrSec>
      <invstOrSec>
        <name>DocuSign Inc</name>
        <lei>549300Q7PVDWRZ39JG09</lei>
        <title>DocuSign Inc</title>
        <cusip>256163106</cusip>
        <identifiers>
          <isin value="US2561631068"/>
        </identifiers>
        <balance>147001.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>11714509.69000000</valUSD>
        <pctVal>0.560103133587</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>Monolithic Power Systems Inc</name>
        <lei>529900TB7O85LSZ1XU31</lei>
        <title>Monolithic Power Systems Inc</title>
        <cusip>609839105</cusip>
        <identifiers>
          <isin value="US6098391054"/>
        </identifiers>
        <balance>15795.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>8965873.80000000</valUSD>
        <pctVal>0.428683243569</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>QUALCOMM Inc</name>
        <lei>H1J8DDZKZP6H7RWC0H53</lei>
        <title>QUALCOMM Inc</title>
        <cusip>747525103</cusip>
        <identifiers>
          <isin value="US7475251036"/>
        </identifiers>
        <balance>234548.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>37182894.44000000</valUSD>
        <pctVal>1.777817103987</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>Shopify Inc</name>
        <lei>549300HGQ43STJLLP808</lei>
        <title>Shopify Inc</title>
        <cusip>82509L107</cusip>
        <identifiers>
          <isin value="CA82509L1076"/>
        </identifiers>
        <balance>528522.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>61097143.20000000</valUSD>
        <pctVal>2.921223530917</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>CA</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>KLA Corp</name>
        <lei>549300H0BF5JCG96TJ81</lei>
        <title>KLA Corp</title>
        <cusip>482480100</cusip>
        <identifiers>
          <isin value="US4824801009"/>
        </identifiers>
        <balance>21395.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13843206.85000000</valUSD>
        <pctVal>0.661882036958</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>Verisk Analytics Inc</name>
        <lei>549300I1YSWNIRKBWP67</lei>
        <title>Verisk Analytics Inc</title>
        <cusip>92345Y106</cusip>
        <identifiers>
          <isin value="US92345Y1064"/>
        </identifiers>
        <balance>114041.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>33552002.61000000</valUSD>
        <pctVal>1.604214115427</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>Pinterest Inc</name>
        <lei>N/A</lei>
        <title>Pinterest Inc</title>
        <cusip>72352L106</cusip>
        <identifiers>
          <isin value="US72352L1061"/>
        </identifiers>
        <balance>464021.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>14069116.72000000</valUSD>
        <pctVal>0.672683413153</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>Apple Inc</name>
        <lei>HWUPKR0MPOU8FGXBT394</lei>
        <title>Apple Inc</title>
        <cusip>037833100</cusip>
        <identifiers>
          <isin value="US0378331005"/>
        </identifiers>
        <balance>528610.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>125455011.30000000</valUSD>
        <pctVal>5.998351344863</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>Taiwan Semiconductor Manufacturing Co Ltd</name>
        <lei>549300KB6NK5SBD14S87</lei>
        <title>Taiwan Semiconductor Manufacturing Co Ltd</title>
        <cusip>000000000</cusip>
        <identifiers>
          <isin value="TW0002330008"/>
        </identifiers>
        <balance>731000.00000000</balance>
        <units>NS</units>
        <currencyConditional curCd="TWD" exchangeRt="32.48300000"/>
        <valUSD>22414062.74000000</valUSD>
        <pctVal>1.071678380856</pctVal>
        <payoffProfile>Long</payoffProfile>
        <assetCat>EC</assetCat>
        <issuerCat>CORP</issuerCat>
        <invCountry>TW</invCountry>
        <isRestrictedSec>N</isRestrictedSec>

        <fairValLevel>1</fairValLevel>
        <securityLending>
          <isCashCollateral>N</isCashCollateral>
          <isNonCashCollateral>N</isNonCashCollateral>
          <isLoanByFund>N</isLoanByFund>
        </securityLending>
      </invstOrSec>
      <invstOrSec>
        <name>Booking Holdings Inc</name>
        <lei>FXM8FAOHMYDIPD38UZ17</lei>
        <title>Booking Holdings Inc</title>
        <cusip>09857L108</cusip>
        <identifiers>
          <isin value="US09857L1089"/>
        </identifiers>
        <balance>2530.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13161009.40000000</valUSD>
        <pctVal>0.629264288578</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>S&amp;P Global Inc</name>
        <lei>Y6X4K52KMJMZE7I7MY94</lei>
        <title>S&amp;P Global Inc</title>
        <cusip>78409V104</cusip>
        <identifiers>
          <isin value="US78409V1044"/>
        </identifiers>
        <balance>25336.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13238313.36000000</valUSD>
        <pctVal>0.632960404880</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>Amazon.com Inc</name>
        <lei>ZXTILKJKG63JELOEG630</lei>
        <title>Amazon.com Inc</title>
        <cusip>023135106</cusip>
        <identifiers>
          <isin value="US0231351067"/>
        </identifiers>
        <balance>66079.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>13737163.31000000</valUSD>
        <pctVal>0.656811801786</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>Onto Innovation Inc</name>
        <lei>254900RXZVN73CHOO062</lei>
        <title>Onto Innovation Inc</title>
        <cusip>683344105</cusip>
        <identifiers>
          <isin value="US6833441057"/>
        </identifiers>
        <balance>31100.00000000</balance>
        <units>NS</units>
        <curCd>USD</curCd>
        <valUSD>5105998.00000000</valUSD>
        <pctVal>0.244131897584</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>
    </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>2024-12-27</ncom:dateSigned>
      <ncom:nameOfApplicant>MFS SERIES TRUST I</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>
