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<PAGE> PAGE 2
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<PAGE> PAGE 6
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<PAGE> PAGE 12
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<PAGE> PAGE 13
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<PAGE> PAGE 14
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<PAGE> PAGE 15
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<PAGE> PAGE 16
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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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<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 61
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<PAGE> PAGE 62
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<PAGE> PAGE 63
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<PAGE> PAGE 64
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<PAGE> PAGE 67
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<PAGE> PAGE 68
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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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<NAME> MFS SERIES TRUST I
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<CIK> 0000798244
<NAME> MFS SERIES TRUST I
<SERIES>
<NUMBER> 122
<NAME> MFS RESEARCH INTERNATIONAL FUND CLASS B
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
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<INVESTMENTS-AT-COST> 32560981
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<TOTAL-ASSETS> 35424641
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<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2723714
<TOTAL-LIABILITIES> 3052511
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 29065679
<SHARES-COMMON-STOCK> 863519
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<ACCUMULATED-NII-CURRENT> 31465
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<ACCUMULATED-NET-GAINS> 662088
<OVERDISTRIBUTION-GAINS> 0
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<NET-ASSETS> 32372130
<DIVIDEND-INCOME> 374856
<INTEREST-INCOME> 55861
<OTHER-INCOME> (42208)
<EXPENSES-NET> (386929)
<NET-INVESTMENT-INCOME> 1580
<REALIZED-GAINS-CURRENT> 665065
<APPREC-INCREASE-CURRENT> 3694691
<NET-CHANGE-FROM-OPS> 4361336
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (630)
<DISTRIBUTIONS-OF-GAINS> (70643)
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<NUMBER-OF-SHARES-SOLD> 802162
<NUMBER-OF-SHARES-REDEEMED> (252900)
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<GROSS-EXPENSE> 533253
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<PER-SHARE-NAV-BEGIN> 10.21
<PER-SHARE-NII> (0.04)
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<EXPENSE-RATIO> 2.37
</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> YEAR
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<PERIOD-START> SEP-01-1998
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<INTEREST-INCOME> 55861
<OTHER-INCOME> (42208)
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<REALIZED-GAINS-CURRENT> 665065
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<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (186)
<DISTRIBUTIONS-OF-GAINS> (19022)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 293111
<NUMBER-OF-SHARES-REDEEMED> (58626)
<SHARES-REINVESTED> 1735
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<GROSS-EXPENSE> 533253
<AVERAGE-NET-ASSETS> 19674221
<PER-SHARE-NAV-BEGIN> 10.21
<PER-SHARE-NII> (0.04)
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<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.15)
<RETURNS-OF-CAPITAL> 0
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<EXPENSE-RATIO> 2.37
</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> YEAR
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
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<INVESTMENTS-AT-COST> 32560981
<INVESTMENTS-AT-VALUE> 35172210
<RECEIVABLES> 194458
<ASSETS-OTHER> 1612
<OTHER-ITEMS-ASSETS> 56361
<TOTAL-ASSETS> 35424641
<PAYABLE-FOR-SECURITIES> 328797
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<SHARES-COMMON-STOCK> 83456
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<ACCUMULATED-NII-CURRENT> 31465
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<OVERDISTRIBUTION-GAINS> 0
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<NET-ASSETS> 32372130
<DIVIDEND-INCOME> 374856
<INTEREST-INCOME> 55861
<OTHER-INCOME> (42208)
<EXPENSES-NET> (386929)
<NET-INVESTMENT-INCOME> 1580
<REALIZED-GAINS-CURRENT> 665065
<APPREC-INCREASE-CURRENT> 3694691
<NET-CHANGE-FROM-OPS> 4361336
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1934)
<DISTRIBUTIONS-OF-GAINS> (17130)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 20210
<NUMBER-OF-SHARES-REDEEMED> (55359)
<SHARES-REINVESTED> 1775
<NET-CHANGE-IN-ASSETS> 23562337
<ACCUMULATED-NII-PRIOR> 6724
<ACCUMULATED-GAINS-PRIOR> 193508
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 196720
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 533253
<AVERAGE-NET-ASSETS> 19674221
<PER-SHARE-NAV-BEGIN> 10.26
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 2.42
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> (0.16)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 12.55
<EXPENSE-RATIO> 1.37
</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> YEAR
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 3174011
<INVESTMENTS-AT-VALUE> 4188092
<RECEIVABLES> 43155
<ASSETS-OTHER> 927
<OTHER-ITEMS-ASSETS> 200
<TOTAL-ASSETS> 4232374
<PAYABLE-FOR-SECURITIES> 28822
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 15158
<TOTAL-LIABILITIES> 43980
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2293043
<SHARES-COMMON-STOCK> 90424
<SHARES-COMMON-PRIOR> 90921
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 881271
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1014080
<NET-ASSETS> 4188394
<DIVIDEND-INCOME> 5030
<INTEREST-INCOME> 6949
<OTHER-INCOME> (89)
<EXPENSES-NET> (42912)
<NET-INVESTMENT-INCOME> (31022)
<REALIZED-GAINS-CURRENT> 932149
<APPREC-INCREASE-CURRENT> 925293
<NET-CHANGE-FROM-OPS> 1826420
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (42102)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 25561
<NUMBER-OF-SHARES-REDEEMED> (28878)
<SHARES-REINVESTED> 2820
<NET-CHANGE-IN-ASSETS> 1347203
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 109472
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27743
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 78227
<AVERAGE-NET-ASSETS> 3707990
<PER-SHARE-NAV-BEGIN> 11.49
<PER-SHARE-NII> (0.08)
<PER-SHARE-GAIN-APPREC> 7.44
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.51)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.34
<EXPENSE-RATIO> 1.17
</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> YEAR
<FISCAL-YEAR-END> AUG-31-1999
<PERIOD-START> SEP-01-1998
<PERIOD-END> AUG-31-1999
<INVESTMENTS-AT-COST> 3174011
<INVESTMENTS-AT-VALUE> 4188092
<RECEIVABLES> 43155
<ASSETS-OTHER> 927
<OTHER-ITEMS-ASSETS> 200
<TOTAL-ASSETS> 4232374
<PAYABLE-FOR-SECURITIES> 28822
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 15158
<TOTAL-LIABILITIES> 43980
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 2293043
<SHARES-COMMON-STOCK> 137983
<SHARES-COMMON-PRIOR> 156264
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 881271
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 1014080
<NET-ASSETS> 4188394
<DIVIDEND-INCOME> 5030
<INTEREST-INCOME> 6949
<OTHER-INCOME> (89)
<EXPENSES-NET> (42912)
<NET-INVESTMENT-INCOME> (31022)
<REALIZED-GAINS-CURRENT> 932149
<APPREC-INCREASE-CURRENT> 925293
<NET-CHANGE-FROM-OPS> 1826420
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (87226)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 60749
<NUMBER-OF-SHARES-REDEEMED> (84872)
<SHARES-REINVESTED> 5842
<NET-CHANGE-IN-ASSETS> 1347203
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 109472
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 27743
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 78227
<AVERAGE-NET-ASSETS> 3707990
<PER-SHARE-NAV-BEGIN> 11.50
<PER-SHARE-NII> (0.22)
<PER-SHARE-GAIN-APPREC> 7.57
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (0.51)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 18.34
<EXPENSE-RATIO> 1.17
</TABLE>
INDEPENDENT AUDITORS' REPORT
To the Trustees and Shareholders of MFS Series Trust I:
In planning and performing our audits of the financial statements of MFS Series
Trust I (composed of MFS Managed Sectors Fund and MFS Cash Reserves Fund) (the
"Trust") for the year ended August 31, 1999 (on which we have issued our reports
dated October 7, 1999), we considered its internal control, including control
activities for safeguarding securities, in order to determine our auditing
procedures for the purpose of expressing our opinions on the financial
statements and to comply with the requirements of Form N-SAR, and not to provide
assurance on the Trust's internal control.
The management of the Trust is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in any internal control, misstatements due to
error or fraud may occur and not be detected. Also, projections of any
evaluation of internal control to future periods are subject to the risk that
the internal control may become inadequate because of changes in conditions or
that the degree of compliance with policies or procedures deteriorates.
Our consideration of the Trust's internal control would not necessarily disclose
all matters in internal control that might be material weaknesses under
standards established by the American Institute of Certified Public Accountants.
A material weakness is a condition in which the design or operation of one or
more of the internal control components does not reduce to a relatively low
level the risk that misstatements caused by error or fraud in amounts that would
be material in relation to the financial statements being audited may occur and
not be detected within a timely period by employees in the normal course of
performing their assigned functions. However, we noted no matters involving the
Trust's internal control and its operation, including controls for safeguarding
securities that we consider to be material weaknesses as defined above as of
August 31, 1999.
This report is intended solely for the information and use of management, the
Board of Trustees, and the Securities and Exchange Commission and is not
intended to be and should not be used by anyone other than these specified
parties.
DELOITTE & TOUCHE LLP
Boston, Massachusetts
October 7, 1999
Report of Independent Auditors
To the Trustees
MFS Series Trust I
In planning and performing our audits of the financial statements of MFS Global
Asset Allocation Fund, MFS Core Growth Fund, MFS Blue Chip Fund, MFS Convertible
Securities Fund, MFS Science and Technology Fund, MFS Strategic Growth Fund, MFS
Equity Income Fund, MFS Research Growth & Income Fund, MFS New Discovery Fund,
and MFS Research International Fund ("the funds") ten of the funds comprising
the MFS Series Trust I, for the year ended August 31, 1999, we considered its
internal control, including control activities for safeguarding securities, in
order to determine our auditing procedures for the purpose of expressing our
opinion on the financial statements and to comply with the requirements of Form
N-SAR, and not to provide assurance on the internal control.
The management of the Funds is responsible for establishing and maintaining
internal control. In fulfilling this responsibility, estimates and judgments by
management are required to assess the expected benefits and related costs of
controls. Generally, controls that are relevant to an audit pertain to the
entity's objective of preparing financial statements for external purposes that
are fairly presented in conformity with generally accepted accounting
principles. Those controls include the safeguarding of assets against
unauthorized acquisition, use or disposition.
Because of inherent limitations in internal control, errors or fraud may occur
and not be detected. Also, projection of any evaluation of internal control to
future periods is subject to the risk that it may become inadequate because of
changes in conditions or that the effectiveness of the design and operation may
deteriorate.
Our consideration of internal control would not necessarily disclose all matters
in internal control that might be material weaknesses under standards
established by the American Institute of Certified Public Accountants. A
material weakness is a condition in which the design or operation of one or more
of the specific internal control components does not reduce to a relatively low
level the risk that errors or fraud in amounts that would be material in
relation to the financial statements being audited may occur and not be detected
within a timely period by employees in the normal course of performing their
assigned functions. However, we noted no matters involving internal control and
its operation, including controls for safeguarding securities, that we consider
to be material weaknesses as defined above at August 31, 1999.
This report is intended solely for the information and use of the trustees and
management of MFS Series Trust I and the Securities and Exchange Commission and
is not intended to be and should not be used by anyone other than these
specified parties.
ERNST & YOUNG LLP
October 9, 1999
