<PAGE> PAGE 1
000 B000000 12/31/94
000 C000000 063091
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 3.0.a
000 J000000 A
001 A000000 MASSACHUSETTS INVESTORS TRUST
001 B000000 811-0203
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003 000000 N
004 000000 N
005 000000 N
006 000000 N
007 A000000 N
007 B000000 0
007 C010100 1
007 C010200 2
007 C010300 3
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A000001 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B000001 A
008 C000001 801-17352
008 D010001 BOSTON
008 D020001 MA
008 D030001 02116
011 A000001 MFS FINANCIAL SERVICES, INC.
011 B000001 8-27864
011 C010001 BOSTON
011 C020001 MA
011 C030001 02116
012 A000001 MFS SERVICE CENTER, INC.
012 B000001 84-1316
012 C010001 BOSTON
012 C020001 MA
012 C030001 02116
013 A000001 DELOITTE & TOUCHE
013 B010001 BOSTON
013 B020001 MA
<PAGE> PAGE 2
013 B030001 02110
015 A000001 STATE STREET BANK AND TRUST COMPANY
015 B000001 C
015 C010001 BOSTON
015 C020001 MA
015 C030001 02110
015 E010001 X
015 A000002 CHASE MANHATTAN BANK, N.A.
015 B000002 S
015 C010002 NEW YORK
015 C020002 NY
015 C030002 10081
015 E040002 X
018 000000 Y
019 A000000 Y
019 B000000 50
019 C000000 MASSFINSER
020 A000001 PAINEWEBBER INCORPORATED
020 B000001 13-2638166
020 C000001 273
020 A000002 CS FIRST BOSTON CORP.
020 B000002 13-5659485
020 C000002 217
020 A000003 GOLDMAN SACHS & COMPANY
020 B000003 13-5108880
020 C000003 177
020 A000004 MORGAN STANLEY
020 B000004 13-2655998
020 C000004 162
020 A000005 SALOMON BROTHERS INC.
020 B000005 13-3082694
020 C000005 128
020 A000006 SANFORD BERNSTEIN & COMPANY
020 B000006 13-2625874
020 C000006 122
020 A000007 STUART FRANKEL & CO.
020 B000007 13-2734702
020 C000007 109
020 A000008 MERRILL LYNCH & CO.
020 B000008 13-5674085
020 C000008 105
020 A000009 H.D. VEST INVESTMENT SECURITIES
020 B000009 75-1869963
020 C000009 92
020 A000010 MONTGOMERY SECURITIES
020 B000010 94-1701676
020 C000010 92
021 000000 4542
022 A000001 LEHMAN BROTHERS
022 B000001 13-2518466
022 C000001 586236
<PAGE> PAGE 3
022 D000001 59794
022 A000002 CHEMICAL BANK
022 B000002 13-4994650
022 C000002 300412
022 D000002 9869
022 A000003 GOLDMAN SACHS & COMPANY
022 B000003 13-5108880
022 C000003 271575
022 D000003 3697
022 A000004 PRUDENTIAL SECURITIES
022 B000004 22-2347336
022 C000004 206225
022 D000004 62782
022 A000005 FORD MOTOR CREDIT
022 B000005 38-1612444
022 C000005 266731
022 D000005 0
022 A000006 BANK OF AMERICA
022 B000006 94-1687665
022 C000006 222567
022 D000006 0
022 A000007 CS FIRST BOSTON
022 B000007 13-5659485
022 C000007 212552
022 D000007 6518
022 A000008 FIRST CHICAGO
022 B000008 36-0899825
022 C000008 89768
022 D000008 0
022 A000009 MERRILL LYNCH
022 B000009 13-5674085
022 C000009 57048
022 D000009 26616
022 A000010 SALOMON BROTHERS INC.
022 B000010 13-3082694
022 C000010 25111
022 D000010 30131
023 C000000 2440322
023 D000000 248180
024 000000 Y
025 A000001 GENERAL ELECTRIC CO.
025 B000001 06-1109503
025 C000001 E
025 D000001 31110
025 D000002 0
025 D000003 0
025 D000004 0
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
<PAGE> PAGE 4
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027 000000 Y
028 A010000 10578
028 A020000 1
028 A030000 0
028 A040000 11354
028 B010000 16348
028 B020000 3
028 B030000 0
028 B040000 12573
028 C010000 15243
028 C020000 4716
028 C030000 0
028 C040000 15346
028 D010000 16598
028 D020000 0
028 D030000 0
028 D040000 11261
028 E010000 16108
028 E020000 3
028 E030000 0
028 E040000 14296
028 F010000 16705
028 F020000 122326
028 F030000 0
028 F040000 15909
028 G010000 91580
028 G020000 127049
028 G030000 0
028 G040000 80738
028 H000000 68424
029 000000 Y
030 A000000 1231
030 B000000 5.75
030 C000000 0.00
031 A000000 73
031 B000000 0
032 000000 1157
033 000000 0
034 000000 Y
035 000000 62
036 A000000 N
036 B000000 0
<PAGE> PAGE 5
037 000000 N
038 000000 0
039 000000 N
040 000000 Y
041 000000 Y
042 A000000 0
042 B000000 0
042 C000000 26
042 D000000 74
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 4141
044 000000 0
045 000000 Y
046 000000 N
047 000000 N
048 000000 0.000
048 A010000 0
048 A020000 0.000
048 B010000 0
048 B020000 0.000
048 C010000 0
048 C020000 0.000
048 D010000 0
048 D020000 0.000
048 E010000 0
048 E020000 0.000
048 F010000 0
048 F020000 0.000
048 G010000 0
048 G020000 0.000
048 H010000 0
048 H020000 0.000
048 I010000 0
048 I020000 0.000
048 J010000 0
048 J020000 0.000
048 K010000 0
048 K020000 0.000
049 000000 N
050 000000 Y
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 N
053 C000000 Y
054 A000000 Y
054 B000000 Y
054 C000000 N
<PAGE> PAGE 6
054 D000000 N
054 E000000 N
054 F000000 N
054 G000000 N
054 H000000 Y
054 I000000 N
054 J000000 Y
054 K000000 N
054 L000000 N
054 M000000 Y
054 N000000 N
054 O000000 N
055 A000000 N
055 B000000 N
056 000000 Y
057 000000 N
058 A000000 N
059 000000 Y
060 A000000 Y
060 B000000 Y
061 000000 1000
062 A000000 N
062 B000000 0.0
062 C000000 0.0
062 D000000 0.0
062 E000000 0.0
062 F000000 0.0
062 G000000 0.0
062 H000000 0.0
062 I000000 0.0
062 J000000 0.0
062 K000000 0.0
062 L000000 0.0
062 M000000 0.0
062 N000000 0.0
062 O000000 0.0
062 P000000 0.0
062 Q000000 0.0
062 R000000 0.0
066 A000000 Y
066 B000000 N
066 C000000 N
066 D000000 N
066 E000000 Y
066 F000000 N
066 G000000 N
067 000000 N
068 A000000 N
068 B000000 N
069 000000 N
070 A010000 Y
<PAGE> PAGE 7
070 A020000 N
070 B010000 N
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 N
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 N
070 F020000 N
070 G010000 N
070 G020000 N
070 H010000 N
070 H020000 N
070 I010000 N
070 I020000 N
070 J010000 Y
070 J020000 Y
070 K010000 Y
070 K020000 N
070 L010000 Y
070 L020000 Y
070 M010000 Y
070 M020000 Y
070 N010000 N
070 N020000 N
070 O010000 Y
070 O020000 N
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 1381483
071 B000000 1406356
071 C000000 1587911
071 D000000 42
072 A000000 12
072 B000000 4762
072 C000000 43625
072 D000000 0
072 E000000 0
072 F000000 4386
072 G000000 0
072 H000000 0
072 I000000 2008
072 J000000 459
072 K000000 264
072 L000000 113
<PAGE> PAGE 8
072 M000000 74
072 N000000 25
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 41
072 S000000 12
072 T000000 5756
072 U000000 0
072 V000000 0
072 W000000 710
072 X000000 13850
072 Y000000 1616
072 Z000000 36153
072AA000000 153087
072BB000000 0
072CC010000 0
072CC020000 207007
072DD010000 34653
072DD020000 722
072EE000000 154197
073 A010000 0.2500
073 A020000 0.1700
073 B000000 1.0500
073 C000000 0.0200
074 A000000 800
074 B000000 0
074 C000000 65639
074 D000000 15088
074 E000000 33149
074 F000000 1484174
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 848
074 K000000 4256
074 L000000 4265
074 M000000 158
074 N000000 1608377
074 O000000 2013
074 P000000 1490
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 1317
074 S000000 0
074 T000000 1603557
074 U010000 159245
074 U020000 6832
074 V010000 10.07
<PAGE> PAGE 9
074 V020000 10.03
074 W000000 0.0000
074 X000000 95935
074 Y000000 0
075 A000000 0
075 B000000 1658362
076 000000 0.00
077 A000000 Y
077 B000000 Y
077 C000000 N
077 D000000 N
077 E000000 N
077 F000000 N
077 G000000 N
077 H000000 N
077 I000000 N
077 J000000 N
077 K000000 N
077 L000000 N
077 M000000 N
077 N000000 N
077 O000000 N
077 P000000 N
077 Q010000 Y
077 Q020000 N
077 Q030000 N
078 000000 N
080 A000000 NATIONAL UNION INSURANCE CO.
080 B000000 ICI MUTUAL
080 C000000 60000
081 A000000 Y
081 B000000 75
082 A000000 N
082 B000000 0
083 A000000 N
083 B000000 0
084 A000000 N
084 B000000 0
085 A000000 Y
085 B000000 N
086 A010000 0
086 A020000 0
086 B010000 0
086 B020000 0
086 C010000 0
086 C020000 0
086 D010000 0
086 D020000 0
086 E010000 0
086 E020000 0
086 F010000 0
<PAGE> PAGE 10
086 F020000 0
SIGNATURE JAMES O. YOST
TITLE ASSISTANT TREASURER
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF MFS MASSACHUSETTS INVESTORS TRUST AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>
<NAME> MFS MASSACHUSETTS INVESTORS TRUST CLASS A
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1994
<PERIOD-END> DEC-31-1994
<INVESTMENTS-AT-COST> 1,398,844,346
<INVESTMENTS-AT-VALUE> 1,598,049,689
<RECEIVABLES> 9,369,780
<ASSETS-OTHER> 22,322
<OTHER-ITEMS-ASSETS> 935,459
<TOTAL-ASSETS> 1,608,377,250
<PAYABLE-FOR-SECURITIES> 2,011,504
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,808,970
<TOTAL-LIABILITIES> 4,820,474
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,407,190,670
<SHARES-COMMON-STOCK> 152,412,907
<SHARES-COMMON-PRIOR> 141,378,119
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (59,285)
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,785,811)
<ACCUM-APPREC-OR-DEPREC> 199,211,202
<NET-ASSETS> 1,603,556,776
<DIVIDEND-INCOME> 43,624,688
<INTEREST-INCOME> 4,762,379
<OTHER-INCOME> 0
<EXPENSES-NET> 12,233,797
<NET-INVESTMENT-INCOME> 36,153,270
<REALIZED-GAINS-CURRENT> 153,086,960
<APPREC-INCREASE-CURRENT> (207,006,595)
<NET-CHANGE-FROM-OPS> (17,766,365)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (34,711,320)
<DISTRIBUTIONS-OF-GAINS> (150,428,102)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 11,401,171
<NUMBER-OF-SHARES-REDEEMED> (13,044,429)
<SHARES-REINVESTED> 12,678,046
<NET-CHANGE-IN-ASSETS> (37,268,285)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 6,655
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4,385,702
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 13,849,564
<AVERAGE-NET-ASSETS> 1,615,766,548
<PER-SHARE-NAV-BEGIN> 11.50
<PER-SHARE-NII> 0.25
<PER-SHARE-GAIN-APPREC> (0.36)
<PER-SHARE-DIVIDEND> (0.25)
<PER-SHARE-DISTRIBUTIONS> (1.07)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.07
<EXPENSE-RATIO> 0.71
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF MFS MASSACHUSETTS INVESTORS TRUST AND IS
QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>
<NAME> MFS MASSACHUSETTS INVESTORS TRUST CLASS B
<S> <C>
<PERIOD-TYPE> 12-MOS
<FISCAL-YEAR-END> DEC-31-1994
<PERIOD-END> DEC-31-1994
<INVESTMENTS-AT-COST> 1,398,844,346
<INVESTMENTS-AT-VALUE> 1,598,049,689
<RECEIVABLES> 9,369,780
<ASSETS-OTHER> 22,322
<OTHER-ITEMS-ASSETS> 935,459
<TOTAL-ASSETS> 1,608,377,250
<PAYABLE-FOR-SECURITIES> 2,011,504
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,808,970
<TOTAL-LIABILITIES> 4,820,474
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1,407,190,670
<SHARES-COMMON-STOCK> 6,831,655
<SHARES-COMMON-PRIOR> 1,270,050
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (59,285)
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> (2,785,811)
<ACCUM-APPREC-OR-DEPREC> 199,211,202
<NET-ASSETS> 1,603,556,776
<DIVIDEND-INCOME> 43,624,688
<INTEREST-INCOME> 4,762,379
<OTHER-INCOME> 0
<EXPENSES-NET> 12,233,797
<NET-INVESTMENT-INCOME> 36,153,270
<REALIZED-GAINS-CURRENT> 153,086,960
<APPREC-INCREASE-CURRENT> (207,006,595)
<NET-CHANGE-FROM-OPS> (17,766,365)
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (722,860)
<DISTRIBUTIONS-OF-GAINS> (6,554,910)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,590,985
<NUMBER-OF-SHARES-REDEEMED> (703,746)
<SHARES-REINVESTED> 674,366
<NET-CHANGE-IN-ASSETS> (37,268,285)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 6,655
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 4,385,702
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 13,849,564
<AVERAGE-NET-ASSETS> 42,397,633
<PER-SHARE-NAV-BEGIN> 11.48
<PER-SHARE-NII> 0.15
<PER-SHARE-GAIN-APPREC> (0.36)
<PER-SHARE-DIVIDEND> (0.17)
<PER-SHARE-DISTRIBUTIONS> (1.07)
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 10.03
<EXPENSE-RATIO> 1.61
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>