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<PAGE> PAGE 12
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<PAGE> PAGE 14
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<PAGE> PAGE 30
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<PAGE> PAGE 41
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<PAGE> PAGE 42
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<PAGE> PAGE 43
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<PAGE> PAGE 44
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<PAGE> PAGE 45
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<PAGE> PAGE 46
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<PAGE> PAGE 47
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<PAGE> PAGE 48
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<PAGE> PAGE 49
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<PAGE> PAGE 50
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013 B011001 BOSTON
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<PAGE> PAGE 51
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<PAGE> PAGE 52
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<PAGE> PAGE 53
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<PAGE> PAGE 54
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<PAGE> PAGE 55
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<PAGE> PAGE 56
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<PAGE> PAGE 57
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<PAGE> PAGE 58
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<PAGE> PAGE 59
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<PAGE> PAGE 60
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<PAGE> PAGE 61
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<PAGE> PAGE 62
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<PAGE> PAGE 63
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<PAGE> PAGE 65
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<PAGE> PAGE 69
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<PAGE> PAGE 71
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SIGNATURE JAMES O. YOST
TITLE ASSISTANT TREASURER
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<NAME> MFS SERIES TRUST I
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<NAME> MFS SERIES TRUST I
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<NAME> MFS SERIES TRUST I
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<NAME> MFS SERIES TRUST I
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<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 164840933
<INVESTMENTS-AT-VALUE> 183547063
<RECEIVABLES> 1303868
<ASSETS-OTHER> 1687
<OTHER-ITEMS-ASSETS> 1908759
<TOTAL-ASSETS> 186761377
<PAYABLE-FOR-SECURITIES> 198753
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 3013132
<TOTAL-LIABILITIES> 3211885
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 166886556
<SHARES-COMMON-STOCK> 29696
<SHARES-COMMON-PRIOR> 41368
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (341818)
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (1879061)
<ACCUM-APPREC-OR-DEPREC> 18883815
<NET-ASSETS> 183549492
<DIVIDEND-INCOME> 1271890
<INTEREST-INCOME> 153582
<OTHER-INCOME> (7049)
<EXPENSES-NET> (1741346)
<NET-INVESTMENT-INCOME> (322923)
<REALIZED-GAINS-CURRENT> (2168541)
<APPREC-INCREASE-CURRENT> (5077698)
<NET-CHANGE-FROM-OPS> (7569162)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (47760)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3344
<NUMBER-OF-SHARES-REDEEMED> (17872)
<SHARES-REINVESTED> 2856
<NET-CHANGE-IN-ASSETS> (27901133)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 15910645
<OVERDISTRIB-NII-PRIOR> (18895)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 662945
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 1777736
<AVERAGE-NET-ASSETS> 206342431
<PER-SHARE-NAV-BEGIN> 17.93
<PER-SHARE-NII> 0.04
<PER-SHARE-GAIN-APPREC> (0.64)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.33)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.00
<EXPENSE-RATIO> 0.97
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 121
<NAME> MFS RESEARCH INTERNATIONAL FUND CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 79686819
<INVESTMENTS-AT-VALUE> 93681941
<RECEIVABLES> 4172320
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 9344522
<TOTAL-ASSETS> 107198863
<PAYABLE-FOR-SECURITIES> 4942791
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 9349514
<TOTAL-LIABILITIES> 14292305
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 74351418
<SHARES-COMMON-STOCK> 2829238
<SHARES-COMMON-PRIOR> 1350364
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (253999)
<ACCUMULATED-NET-GAINS> 4828175
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13980964
<NET-ASSETS> 92906558
<DIVIDEND-INCOME> 223168
<INTEREST-INCOME> 83974
<OTHER-INCOME> (24124)
<EXPENSES-NET> (534809)
<NET-INVESTMENT-INCOME> (251791)
<REALIZED-GAINS-CURRENT> 5382168
<APPREC-INCREASE-CURRENT> 11368066
<NET-CHANGE-FROM-OPS> 16498443
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (29205)
<DISTRIBUTIONS-OF-GAINS> (622589)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1916656
<NUMBER-OF-SHARES-REDEEMED> (476369)
<SHARES-REINVESTED> 38587
<NET-CHANGE-IN-ASSETS> 60534428
<ACCUMULATED-NII-PRIOR> 31465
<ACCUMULATED-GAINS-PRIOR> 662088
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 262633
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 580704
<AVERAGE-NET-ASSETS> 52779017
<PER-SHARE-NAV-BEGIN> 12.47
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 4.57
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> (0.34)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.63
<EXPENSE-RATIO> 1.75
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 122
<NAME> MFS RESEARCH INTERNATIONAL FUND CLASS B
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 79686819
<INVESTMENTS-AT-VALUE> 93681941
<RECEIVABLES> 4172320
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 9344522
<TOTAL-ASSETS> 107198863
<PAYABLE-FOR-SECURITIES> 4942791
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 9349514
<TOTAL-LIABILITIES> 14292305
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 74351418
<SHARES-COMMON-STOCK> 1902797
<SHARES-COMMON-PRIOR> 863519
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (253999)
<ACCUMULATED-NET-GAINS> 4828175
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13980964
<NET-ASSETS> 92906558
<DIVIDEND-INCOME> 223168
<INTEREST-INCOME> 83974
<OTHER-INCOME> (24124)
<EXPENSES-NET> (534809)
<NET-INVESTMENT-INCOME> (251791)
<REALIZED-GAINS-CURRENT> 5382168
<APPREC-INCREASE-CURRENT> 11368066
<NET-CHANGE-FROM-OPS> 16498443
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (413053)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1277298
<NUMBER-OF-SHARES-REDEEMED> (263664)
<SHARES-REINVESTED> 25644
<NET-CHANGE-IN-ASSETS> 60534428
<ACCUMULATED-NII-PRIOR> 31465
<ACCUMULATED-GAINS-PRIOR> 662088
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 262633
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 580704
<AVERAGE-NET-ASSETS> 52779017
<PER-SHARE-NAV-BEGIN> 12.37
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 4.53
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.34)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.47
<EXPENSE-RATIO> 2.40
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 123
<NAME> MFS RESEARCH INTERNATIONAL FUND CLASS C
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 79686819
<INVESTMENTS-AT-VALUE> 93681941
<RECEIVABLES> 4172320
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 9344522
<TOTAL-ASSETS> 107198863
<PAYABLE-FOR-SECURITIES> 4942791
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 9349514
<TOTAL-LIABILITIES> 14292305
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 74351418
<SHARES-COMMON-STOCK> 753198
<SHARES-COMMON-PRIOR> 307647
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (253999)
<ACCUMULATED-NET-GAINS> 4828175
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13980964
<NET-ASSETS> 92906558
<DIVIDEND-INCOME> 223168
<INTEREST-INCOME> 83974
<OTHER-INCOME> (24124)
<EXPENSES-NET> (534809)
<NET-INVESTMENT-INCOME> (251791)
<REALIZED-GAINS-CURRENT> 5382168
<APPREC-INCREASE-CURRENT> 11368066
<NET-CHANGE-FROM-OPS> 16498443
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (144208)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 617290
<NUMBER-OF-SHARES-REDEEMED> (181036)
<SHARES-REINVESTED> 9297
<NET-CHANGE-IN-ASSETS> 60534428
<ACCUMULATED-NII-PRIOR> 31465
<ACCUMULATED-GAINS-PRIOR> 662088
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 262633
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 580704
<AVERAGE-NET-ASSETS> 52779017
<PER-SHARE-NAV-BEGIN> 12.36
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 4.52
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> (0.34)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.45
<EXPENSE-RATIO> 2.40
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 124
<NAME> MFS RESEARCH INTERNATIONAL FUND CLASS I
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> OCT-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 79686819
<INVESTMENTS-AT-VALUE> 93681941
<RECEIVABLES> 4172320
<ASSETS-OTHER> 80
<OTHER-ITEMS-ASSETS> 9344522
<TOTAL-ASSETS> 107198863
<PAYABLE-FOR-SECURITIES> 4942791
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 9349514
<TOTAL-LIABILITIES> 14292305
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 74351418
<SHARES-COMMON-STOCK> 126248
<SHARES-COMMON-PRIOR> 83456
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (253999)
<ACCUMULATED-NET-GAINS> 4828175
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 13980964
<NET-ASSETS> 92906558
<DIVIDEND-INCOME> 223168
<INTEREST-INCOME> 83974
<OTHER-INCOME> (24124)
<EXPENSES-NET> (534809)
<NET-INVESTMENT-INCOME> (251791)
<REALIZED-GAINS-CURRENT> 5382168
<APPREC-INCREASE-CURRENT> 11368066
<NET-CHANGE-FROM-OPS> 16498443
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (4468)
<DISTRIBUTIONS-OF-GAINS> (36231)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 44474
<NUMBER-OF-SHARES-REDEEMED> (4358)
<SHARES-REINVESTED> 2676
<NET-CHANGE-IN-ASSETS> 60534428
<ACCUMULATED-NII-PRIOR> 31465
<ACCUMULATED-GAINS-PRIOR> 662088
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 262633
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 580704
<AVERAGE-NET-ASSETS> 52779017
<PER-SHARE-NAV-BEGIN> 12.55
<PER-SHARE-NII> (0.02)
<PER-SHARE-GAIN-APPREC> 4.60
<PER-SHARE-DIVIDEND> (0.04)
<PER-SHARE-DISTRIBUTIONS> (0.34)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 16.75
<EXPENSE-RATIO> 1.40
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 131
<NAME> MFS SCIENCE AND TECHNOLOGY FUND - CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 4498909
<INVESTMENTS-AT-VALUE> 7325436
<RECEIVABLES> 197716
<ASSETS-OTHER> 36
<OTHER-ITEMS-ASSETS> 1887
<TOTAL-ASSETS> 7525075
<PAYABLE-FOR-SECURITIES> 16995
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 16011
<TOTAL-LIABILITIES> 33006
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4074977
<SHARES-COMMON-STOCK> 110565
<SHARES-COMMON-PRIOR> 90424
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (18686)
<ACCUMULATED-NET-GAINS> 609257
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2826521
<NET-ASSETS> 7492069
<DIVIDEND-INCOME> 3893
<INTEREST-INCOME> 2480
<OTHER-INCOME> (5)
<EXPENSES-NET> (25054)
<NET-INVESTMENT-INCOME> (18686)
<REALIZED-GAINS-CURRENT> 810844
<APPREC-INCREASE-CURRENT> 1812441
<NET-CHANGE-FROM-OPS> 2604599
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (365386)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 18122
<NUMBER-OF-SHARES-REDEEMED> (16415)
<SHARES-REINVESTED> 18434
<NET-CHANGE-IN-ASSETS> 3303675
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 881271
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 19988
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 49865
<AVERAGE-NET-ASSETS> 5363405
<PER-SHARE-NAV-BEGIN> 18.34
<PER-SHARE-NII> (0.07)
<PER-SHARE-GAIN-APPREC> 10.10
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (4.58)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 23.79
<EXPENSE-RATIO> 0.95
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 132
<NAME> MFS SCIENCE AND TECHNOLOGY FUND - CLASS I
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-2000
<PERIOD-START> SEP-01-1999
<PERIOD-END> FEB-29-2000
<INVESTMENTS-AT-COST> 4498909
<INVESTMENTS-AT-VALUE> 7325436
<RECEIVABLES> 197716
<ASSETS-OTHER> 36
<OTHER-ITEMS-ASSETS> 1887
<TOTAL-ASSETS> 7525075
<PAYABLE-FOR-SECURITIES> 16995
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 16011
<TOTAL-LIABILITIES> 33006
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 4074977
<SHARES-COMMON-STOCK> 204283
<SHARES-COMMON-PRIOR> 137983
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (18686)
<ACCUMULATED-NET-GAINS> 609257
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 2826521
<NET-ASSETS> 7492069
<DIVIDEND-INCOME> 3893
<INTEREST-INCOME> 2480
<OTHER-INCOME> (5)
<EXPENSES-NET> (25054)
<NET-INVESTMENT-INCOME> (18686)
<REALIZED-GAINS-CURRENT> 810844
<APPREC-INCREASE-CURRENT> 1812441
<NET-CHANGE-FROM-OPS> 2604599
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (717472)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 48513
<NUMBER-OF-SHARES-REDEEMED> (18393)
<SHARES-REINVESTED> 36180
<NET-CHANGE-IN-ASSETS> 3303675
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 881271
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 19988
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 49865
<AVERAGE-NET-ASSETS> 5363405
<PER-SHARE-NAV-BEGIN> 18.34
<PER-SHARE-NII> (0.07)
<PER-SHARE-GAIN-APPREC> 10.11
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (4.58)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 23.80
<EXPENSE-RATIO> 0.95
</TABLE>
SUB-ITEM 77D
MFS Series Trust I ("Trust I")
on behalf of:
MFS Cash Reserve Fund ("MCF")
MCF added to its Principal Investment Strategies the ability to invest in
municipal securities and participation interests in municipal securities, up to
20% of the fund's net assets, as described in the January 28, 2000 Supplement to
the Prospectus, as filed under Rule 497(e)(File Nos. 33-7638 and 811-4777) with
the Securities and Exchange Commission via EDGAR on January 31, 2000. This
document is hereby incorporated to this filing by reference.
SUB-ITEM 77H
MFS SERIES TRUST I ON BEHALF OF:
MFS Core Growth Fund
MFS Science and Technology Fund
MFS New Discovery Fund
MFS Research International Fund
As of February 29, 2000, entities beneficially owning more than 25% of
any one Series' voting securities, thereby becoming controlling entities of such
Series, are those entities as follows:
<TABLE>
<CAPTION>
% OF SHARES
SERIES OWNER AND ADDRESS OWNED
<S> <C> <C>
MFS Core Growth Fund MFS Defined Contribution Plan 76.46%
I Shares c/o Mark Leary
Massachusetts Financial Services
500 Boylston Street
Boston, Massachusetts 02116-3740
MFS Science and Technology Fund MFS Defined Contribution Plan 64.87%
I Shares C/o Mark Leary
Massachusetts Financial Services
500 Boylston Street
Boston, MA 02116-3740
</TABLE>
SUB-ITEM 77H (continued)
As of February 29, 2000, entities no longer beneficially owning more
than 25% of any one Series' voting securities, thereby ceasing to be controlling
entities of such Series, are as follows:
<TABLE>
<CAPTION>
SERIES OWNER AND ADDRESS
<S> <C>
MFS New Discovery Fund MFS Defined Contribution Plan
Class I Shares C/o Mark Leary
Massachusetts Financial Services
500 Boylston Street
Boston, MA 02116-3740
MFS Science and Technology Fund The First National Bank of Boston, Trustee for
Class A Shares IRA R/O Ned L. Rigsbee
10 Nash Street
Westboro, MA 01581-3607
MFS Research International Fund MFS Defined Contribution Plan
Class A Shares c/o Mark Leary
Class I Shares Massachusetts Financial Services
500 Boylston Street
Boston, MA 02116-3740
</TABLE>
SUB-ITEM 77I
MFS SERIES TRUST I
on behalf of MFS Strategic Growth Fund
(b) The MFS Strategic Growth Fund, a series of MFS Series Trust I, established
a new class of shares as described in the supplement contained in
Post-Effective Amendment No. 34 to the Registration Statement (File Nos.
33-7638 and 811-4777), as filed with the Securities and Exchange Commission
via EDGAR on October 29, 1999. Such description is incorporated herein by
reference.
SUB-ITEM 77Q1(a)(1)
MFS SERIES TRUST I
on behalf of MFS Strategic Growth Fund
A Certification of Amendment to the Declaration of Trust - Establishment and
Designation of Class J Shares effective October 28, 1999 to designate Class J
Shares of Strategic Growth Fund is contained in Post-Effective Amendment No. 35
to the Registration Statement (File Nos. 33-7638 and 811-4777) as with the
Securities and Exchange Commission via EDGAR on March 15, 2000. Such document is
incorporated herein by reference.
