<PAGE> PAGE 1
000 A000000 06/30/1999
000 C000000 0000063091
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
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
010 A000001 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B000001 801-17352
010 C010001 BOSTON
010 C020001 MA
010 C030001 02116
011 A000001 MFS FUND DISTRIBUTORS, 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
<PAGE> PAGE 2
012 C020001 MA
012 C030001 02116
013 A000001 DELOITTE & TOUCHE LLP
013 B010001 BOSTON
013 B020001 MA
013 B030001 02116
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 STATE STREET BANK AND TRUST COMPANY
015 B000002 S
015 C010002 BOSTON
015 C020002 MA
015 C030002 02110
015 E040002 X
015 A000003 THE BANK OF NEW YORK
015 B000003 S
015 C010003 NEW YORK
015 C020003 NY
015 C030003 10286
015 E010003 X
018 000000 Y
019 A000000 Y
019 B000000 56
019 C000000 MASSFINSER
020 A000001 DONALDSON, LUFKIN, JENRETTE
020 B000001 13-2741729
020 C000001 1306
020 A000002 MERRILL LYNCH PIERCE FENNER
020 B000002 13-5674085
020 C000002 822
020 A000003 MORGAN STANLEY AND CO., INC.
020 B000003 13-2655998
020 C000003 685
020 A000004 SALOMON SMITH BARNEY, INC.
020 B000004 13-1912900
020 C000004 561
020 A000005 EDWARDS A.G. & SONS, INC
020 B000005 43-0895447
020 C000005 402
020 A000006 ROYAL ALLIANCE ASSOCIATES
020 B000006 00-0000000
020 C000006 370
020 A000007 HD VEST
020 B000007 00-0000000
020 C000007 345
020 A000008 PRUDENTIAL SECURITIES, INC.
020 B000008 22-2347336
<PAGE> PAGE 3
020 C000008 243
020 A000009 BEAR STEARNS SECURITIES, INC.
020 B000009 13-3299429
020 C000009 234
020 A000010 LEHMAN BROTHERS, INC.
020 B000010 13-2518466
020 C000010 230
021 000000 9831
022 A000001 GENERAL ELECTRIC CO.
022 B000001 06-1109503
022 C000001 2659343
022 D000001 0
022 A000002 BANK OF BOSTON
022 B000002 04-2472499
022 C000002 945382
022 D000002 296723
022 A000003 PRUDENTIAL SECURITIES, INC.
022 B000003 22-2347336
022 C000003 588076
022 D000003 163883
022 A000004 FIRST CHICAGO CAPITAL MARKETS
022 B000004 36-3595942
022 C000004 135609
022 D000004 247453
022 A000005 GOLDMAN SACHS & CO.
022 B000005 13-5108880
022 C000005 310174
022 D000005 42797
022 A000006 MERRILL LYNCH PIERCE FENNER
022 B000006 13-5674085
022 C000006 307475
022 D000006 24031
022 A000007 CS FIRST BOSTON CORP.
022 B000007 13-5659485
022 C000007 293554
022 D000007 28216
022 A000008 SALOMON SMITH BARNEY, INC.
022 B000008 13-1912900
022 C000008 242257
022 D000008 59636
022 A000009 CHASE SECURITIES, INC.
022 B000009 13-3112953
022 C000009 293825
022 D000009 0
022 A000010 ASSOCIATES CORP. N.A.
022 B000010 95-3794341
022 C000010 268551
022 D000010 0
023 C000000 7015360
023 D000000 1154066
024 000000 Y
<PAGE> PAGE 4
025 A000001 GENERAL ELECTRIC CO.
025 B000001 06-1109503
025 C000001 E
025 D000001 227074
025 A000002 ASSOCIATES FIRST CAPITAL CORP.
025 B000002 95-3794341
025 C000002 E
025 D000002 119223
025 A000003 GOLDMAN SACHS GROUP, INC.
025 B000003 13-5108880
025 C000003 E
025 D000003 10122
025 A000004 GOLDMAN SACHS GROUP LP
025 B000004 13-5108880
025 C000004 D
025 D000004 9963
025 D000005 0
025 D000006 0
025 D000007 0
025 D000008 0
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 693318
028 A020000 0
028 A030000 0
028 A040000 175193
028 B010000 657642
028 B020000 0
028 B030000 0
028 B040000 194870
028 C010000 837938
028 C020000 64975
028 C030000 0
028 C040000 283361
028 D010000 707119
028 D020000 0
028 D030000 0
028 D040000 305628
028 E010000 560607
028 E020000 0
028 E030000 0
028 E040000 218198
028 F010000 574585
<PAGE> PAGE 5
028 F020000 4137
028 F030000 0
028 F040000 274358
028 G010000 4031209
028 G020000 69112
028 G030000 0
028 G040000 1451608
028 H000000 1987859
029 000000 Y
030 A000000 25077
030 B000000 5.75
030 C000000 0.00
031 A000000 3384
031 B000000 0
032 000000 21693
033 000000 0
034 000000 Y
035 000000 4173
036 A000000 N
036 B000000 0
037 000000 N
038 000000 0
039 000000 N
040 000000 Y
041 000000 Y
042 A000000 0
042 B000000 0
042 C000000 50
042 D000000 50
042 E000000 0
042 F000000 0
042 G000000 0
042 H000000 0
043 000000 41238
044 000000 0
045 000000 Y
046 000000 N
047 000000 Y
048 000000 0.330
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
<PAGE> PAGE 6
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 N
051 000000 N
052 000000 N
053 A000000 Y
053 B000000 N
053 C000000 Y
054 A000000 Y
054 B000000 N
054 C000000 N
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
<PAGE> PAGE 7
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
063 A000000 0
063 B000000 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
070 A020000 N
070 B010000 Y
070 B020000 N
070 C010000 N
070 C020000 N
070 D010000 Y
070 D020000 N
070 E010000 N
070 E020000 N
070 F010000 Y
070 F020000 N
070 G010000 Y
070 G020000 N
070 H010000 Y
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 Y
070 N020000 Y
070 O010000 Y
070 O020000 N
<PAGE> PAGE 8
070 P010000 Y
070 P020000 N
070 Q010000 N
070 Q020000 N
070 R010000 N
070 R020000 N
071 A000000 6151123
071 B000000 3590572
071 C000000 13055144
071 D000000 28
072 A000000 6
072 B000000 15324
072 C000000 82001
072 D000000 0
072 E000000 -498
072 F000000 22337
072 G000000 186
072 H000000 0
072 I000000 7182
072 J000000 1202
072 K000000 597
072 L000000 266
072 M000000 80
072 N000000 0
072 O000000 0
072 P000000 0
072 Q000000 0
072 R000000 18
072 S000000 18
072 T000000 41302
072 U000000 0
072 V000000 0
072 W000000 4170
072 X000000 77358
072 Y000000 461
072 Z000000 19930
072AA000000 448460
072BB000000 0
072CC010000 329892
072CC020000 0
072DD010000 18558
072DD020000 1121
072EE000000 68191
073 A010000 0.0500
073 A020000 0.0100
073 B000000 0.1000
073 C000000 0.0000
074 A000000 300
074 B000000 0
074 C000000 700613
074 D000000 19295
<PAGE> PAGE 9
074 E000000 46943
074 F000000 14732785
074 G000000 0
074 H000000 0
074 I000000 0
074 J000000 116078
074 K000000 0
074 L000000 70082
074 M000000 101
074 N000000 15686197
074 O000000 205154
074 P000000 441
074 Q000000 0
074 R010000 0
074 R020000 0
074 R030000 0
074 R040000 18612
074 S000000 0
074 T000000 15461990
074 U010000 406908
074 U020000 250907
074 V010000 21.25
074 V020000 21.00
074 W000000 0.0000
074 X000000 731842
074 Y000000 0
075 A000000 0
075 B000000 13678181
076 000000 0.00
077 A000000 N
078 000000 N
080 C000000 0
081 B000000 0
082 B000000 0
083 B000000 0
084 B000000 0
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
086 F020000 0
SIGNATURE JAMES O. YOST
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000063091
<NAME> MASSACHUSETTS INVESTORS TRUST
<SERIES>
<NUMBER> 011
<NAME> MASSACHUSETTS INVESTORS TRUST - CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 12354930358
<INVESTMENTS-AT-VALUE> 15499636045
<RECEIVABLES> 186159693
<ASSETS-OTHER> 98745
<OTHER-ITEMS-ASSETS> 302218
<TOTAL-ASSETS> 15686196701
<PAYABLE-FOR-SECURITIES> 205154251
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19052509
<TOTAL-LIABILITIES> 224206760
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11885806529
<SHARES-COMMON-STOCK> 406908270
<SHARES-COMMON-PRIOR> 354985635
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1281251)
<ACCUMULATED-NET-GAINS> 432973132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3144491531
<NET-ASSETS> 15461989941
<DIVIDEND-INCOME> 82000526
<INTEREST-INCOME> 15324200
<OTHER-INCOME> (497705)
<EXPENSES-NET> (76897490)
<NET-INVESTMENT-INCOME> 19929531
<REALIZED-GAINS-CURRENT> 448459861
<APPREC-INCREASE-CURRENT> 329891887
<NET-CHANGE-FROM-OPS> 798281279
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (18557677)
<DISTRIBUTIONS-OF-GAINS> (39050042)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 97439473
<NUMBER-OF-SHARES-REDEEMED> (47646272)
<SHARES-REINVESTED> 2129434
<NET-CHANGE-IN-ASSETS> 3357765891
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 52704368
<OVERDISTRIB-NII-PRIOR> (172914)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 22337384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 77358090
<AVERAGE-NET-ASSETS> 13678181311
<PER-SHARE-NAV-BEGIN> 20.25
<PER-SHARE-NII> 0.06
<PER-SHARE-GAIN-APPREC> 1.09
<PER-SHARE-DIVIDEND> (0.05)
<PER-SHARE-DISTRIBUTIONS> (0.10)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.25
<EXPENSE-RATIO> 0.88
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000063091
<NAME> MASSACHUSETTS INVESTORS TRUST
<SERIES>
<NUMBER> 012
<NAME> MASSACHUSETTS INVESTORS TRUST - CLASS B
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 12354930358
<INVESTMENTS-AT-VALUE> 15499636045
<RECEIVABLES> 186159693
<ASSETS-OTHER> 98745
<OTHER-ITEMS-ASSETS> 302218
<TOTAL-ASSETS> 15686196701
<PAYABLE-FOR-SECURITIES> 205154251
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19052509
<TOTAL-LIABILITIES> 224206760
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11885806529
<SHARES-COMMON-STOCK> 250907347
<SHARES-COMMON-PRIOR> 192735647
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1281251)
<ACCUMULATED-NET-GAINS> 432973132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3144491531
<NET-ASSETS> 15461989941
<DIVIDEND-INCOME> 82000526
<INTEREST-INCOME> 15324200
<OTHER-INCOME> (497705)
<EXPENSES-NET> (76897490)
<NET-INVESTMENT-INCOME> 19929531
<REALIZED-GAINS-CURRENT> 448459861
<APPREC-INCREASE-CURRENT> 329891887
<NET-CHANGE-FROM-OPS> 798281279
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1120839)
<DISTRIBUTIONS-OF-GAINS> (22566380)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 73476108
<NUMBER-OF-SHARES-REDEEMED> (16312283)
<SHARES-REINVESTED> 1007875
<NET-CHANGE-IN-ASSETS> 3357765891
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 52704368
<OVERDISTRIB-NII-PRIOR> (172914)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 22337384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 77358090
<AVERAGE-NET-ASSETS> 13678181311
<PER-SHARE-NAV-BEGIN> 20.04
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 1.08
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> (0.10)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.00
<EXPENSE-RATIO> 1.53
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000063091
<NAME> MASSACHUSETTS INVESTORS TRUST
<SERIES>
<NUMBER> 013
<NAME> MASSACHUSETTS INVESTORS TRUST - CLASS C
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 12354930358
<INVESTMENTS-AT-VALUE> 15499636045
<RECEIVABLES> 186159693
<ASSETS-OTHER> 98745
<OTHER-ITEMS-ASSETS> 302218
<TOTAL-ASSETS> 15686196701
<PAYABLE-FOR-SECURITIES> 205154251
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19052509
<TOTAL-LIABILITIES> 224206760
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11885806529
<SHARES-COMMON-STOCK> 61891693
<SHARES-COMMON-PRIOR> 41319057
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1281251)
<ACCUMULATED-NET-GAINS> 432973132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3144491531
<NET-ASSETS> 15461989941
<DIVIDEND-INCOME> 82000526
<INTEREST-INCOME> 15324200
<OTHER-INCOME> (497705)
<EXPENSES-NET> (76897490)
<NET-INVESTMENT-INCOME> 19929531
<REALIZED-GAINS-CURRENT> 448459861
<APPREC-INCREASE-CURRENT> 329891887
<NET-CHANGE-FROM-OPS> 798281279
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (397240)
<DISTRIBUTIONS-OF-GAINS> (5381906)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 26146660
<NUMBER-OF-SHARES-REDEEMED> (5774474)
<SHARES-REINVESTED> 200450
<NET-CHANGE-IN-ASSETS> 3357765891
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 52704368
<OVERDISTRIB-NII-PRIOR> (172914)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 22337384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 77358090
<AVERAGE-NET-ASSETS> 13678181311
<PER-SHARE-NAV-BEGIN> 19.95
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> 1.08
<PER-SHARE-DIVIDEND> (0.01)
<PER-SHARE-DISTRIBUTIONS> (0.10)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 20.91
<EXPENSE-RATIO> 1.53
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<CIK> 0000063091
<NAME> MASSACHUSETTS INVESTORS TRUST
<SERIES>
<NUMBER> 014
<NAME> MASSACHUSETTS INVESTORS TRUST - CLASS I
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> DEC-31-1999
<PERIOD-START> JAN-01-1999
<PERIOD-END> JUN-30-1999
<INVESTMENTS-AT-COST> 12354930358
<INVESTMENTS-AT-VALUE> 15499636045
<RECEIVABLES> 186159693
<ASSETS-OTHER> 98745
<OTHER-ITEMS-ASSETS> 302218
<TOTAL-ASSETS> 15686196701
<PAYABLE-FOR-SECURITIES> 205154251
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 19052509
<TOTAL-LIABILITIES> 224206760
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 11885806529
<SHARES-COMMON-STOCK> 11737123
<SHARES-COMMON-PRIOR> 11354631
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1281251)
<ACCUMULATED-NET-GAINS> 432973132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 3144491531
<NET-ASSETS> 15461989941
<DIVIDEND-INCOME> 82000526
<INTEREST-INCOME> 15324200
<OTHER-INCOME> (497705)
<EXPENSES-NET> (76897490)
<NET-INVESTMENT-INCOME> 19929531
<REALIZED-GAINS-CURRENT> 448459861
<APPREC-INCREASE-CURRENT> 329891887
<NET-CHANGE-FROM-OPS> 798281279
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (962112)
<DISTRIBUTIONS-OF-GAINS> (1192769)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1716025
<NUMBER-OF-SHARES-REDEEMED> (1419861)
<SHARES-REINVESTED> 86328
<NET-CHANGE-IN-ASSETS> 3357765891
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 52704368
<OVERDISTRIB-NII-PRIOR> (172914)
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 22337384
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 77358090
<AVERAGE-NET-ASSETS> 13678181311
<PER-SHARE-NAV-BEGIN> 20.26
<PER-SHARE-NII> 0.09
<PER-SHARE-GAIN-APPREC> 1.10
<PER-SHARE-DIVIDEND> (0.08)
<PER-SHARE-DISTRIBUTIONS> (0.10)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 21.27
<EXPENSE-RATIO> 0.53
</TABLE>