<PAGE> PAGE 1
000 B000000 08/31/95
000 C000000 0000798244
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 MFS SERIES TRUST I
001 B000000 811-4777
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 Y
007 B000000 3
007 C010100 1
007 C020100 MFS MANAGED SECTORS FUND
007 C030100 N
007 C010200 2
007 C020200 MFS CASH RESERVE FUND
007 C030200 N
007 C010300 3
007 C020300 MFS WORLD ASSET ALLOCATION FUND
007 C030300 N
007 C010400 4
007 C010500 5
007 C010600 6
007 C010700 7
007 C010800 8
007 C010900 9
007 C011000 10
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
011 A00AA01 MFS FINANCIAL SERVICES, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
<PAGE> PAGE 2
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02107
012 C04AA01 9906
018 00AA00 Y
019 A00AA00 Y
019 B00AA00 50
019 C00AA00 MASSFINSER
020 A000001 PAINEWEBBER INCORPORATED
020 B000001 13-2638166
020 C000001 127
020 A000002 CS FIRST BOSTON CORP.
020 B000002 13-5659485
020 C000002 81
020 A000003 MERRILL LYNCH & CO.
020 B000003 13-5674085
020 C000003 72
020 A000004 MORGAN STANLEY
020 B000004 13-2655998
020 C000004 71
020 A000005 GOLDMAN SACHS & CO.
020 B000005 13-5108880
020 C000005 64
020 A000006 J.P. MORGAN SECURITIES, INC
020 B000006 13-3224016
020 C000006 56
020 A000007 INSTINET CORP.
020 B000007 13-3443395
020 C000007 45
020 A000008 BEAR STEARNS & COMPANY
020 B000008 13-4946705
020 C000008 44
020 A000009 SANFORD BERNSTEIN & CO.
020 B000009 13-2625874
020 C000009 43
020 A000010 SALOMON BROTHERS INC.
020 B000010 13-3082694
020 C000010 33
021 000000 1287
022 A000001 LEHMAN BROTHERS
022 B000001 13-2518466
022 C000001 785553
022 D000001 55750
022 A000002 CHEMICAL BANK
022 B000002 13-4994650
022 C000002 514332
022 D000002 35698
022 A000003 GOLDMAN SACHS & COMPANY
022 B000003 13-5108880
022 C000003 353424
022 D000003 21556
<PAGE> PAGE 3
022 A000004 CS FIRST BOSTON
022 B000004 13-5659485
022 C000004 331629
022 D000004 30657
022 A000005 FORD MOTOR CREDIT
022 B000005 38-1612444
022 C000005 311210
022 D000005 7634
022 A000006 PRUDENTIAL SECURITIES
022 B000006 22-2347336
022 C000006 271136
022 D000006 41405
022 A000007 BANK OF AMERICA
022 B000007 94-1687665
022 C000007 305233
022 D000007 5672
022 A000008 FIRST CHICAGO
022 B000008 36-0899825
022 C000008 183923
022 D000008 0
022 A000009 NATIONSBANK
022 B000009 75-0520130
022 C000009 173805
022 D000009 0
022 A000010 HONG KONG SHANGHAI BANK
022 B000010 00-0000000
022 C000010 85297
022 D000010 3482
023 C000000 3632127
023 D000000 300017
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
054 A00AA00 Y
054 B00AA00 Y
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
<PAGE> PAGE 4
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
058 A00AA00 N
059 00AA00 Y
060 A00AA00 N
060 B00AA00 N
061 00AA00 1000
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 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 ICI MUTUAL
080 C00AA00 60000
081 A00AA00 Y
081 B00AA00 74
082 A00AA00 N
082 B00AA00 0
083 A00AA00 N
083 B00AA00 0
084 A00AA00 N
084 B00AA00 0
085 A00AA00 Y
085 B00AA00 N
086 A01AA00 0
086 A02AA00 0
086 B01AA00 0
086 B02AA00 0
086 C01AA00 0
086 C02AA00 0
086 D01AA00 0
086 D02AA00 0
086 E01AA00 0
<PAGE> PAGE 5
086 E02AA00 0
086 F01AA00 0
086 F02AA00 0
013 A000101 DELOITTE & TOUCHE
013 B010101 BOSTON
013 B020101 MA
013 B030101 02110
013 B040101 1617
015 A000101 STATE STREET BANK AND TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
015 E010101 X
015 A000102 CHASE MANHATTAN BANK, N.A.
015 B000102 S
015 C010102 NEW YORK
015 C020102 NY
015 C030102 10081
015 E040102 X
024 000100 N
028 A010100 8742
028 A020100 0
028 A030100 0
028 A040100 14191
028 B010100 9252
028 B020100 0
028 B030100 0
028 B040100 11101
028 C010100 26465
028 C020100 0
028 C030100 0
028 C040100 24991
028 D010100 9235
028 D020100 0
028 D030100 0
028 D040100 14329
028 E010100 22385
028 E020100 0
028 E030100 0
028 E040100 23924
028 F010100 11133
028 F020100 0
028 F030100 0
028 F040100 16972
028 G010100 87213
028 G020100 0
028 G030100 0
028 G040100 105508
028 H000100 2088
029 000100 Y
<PAGE> PAGE 6
030 A000100 68
030 B000100 5.75
030 C000100 0.00
031 A000100 9
031 B000100 0
032 000100 59
033 000100 0
034 000100 Y
035 000100 176
036 A000100 N
036 B000100 0
037 000100 N
038 000100 0
039 000100 N
040 000100 Y
041 000100 Y
042 A000100 0
042 B000100 0
042 C000100 5
042 D000100 95
042 E000100 0
042 F000100 0
042 G000100 0
042 H000100 0
043 000100 2507
044 000100 0
045 000100 Y
046 000100 N
047 000100 Y
048 000100 0.750
048 A010100 0
048 A020100 0.000
048 B010100 0
048 B020100 0.000
048 C010100 0
048 C020100 0.000
048 D010100 0
048 D020100 0.000
048 E010100 0
048 E020100 0.000
048 F010100 0
048 F020100 0.000
048 G010100 0
048 G020100 0.000
048 H010100 0
048 H020100 0.000
048 I010100 0
048 I020100 0.000
048 J010100 0
048 J020100 0.000
048 K010100 0
<PAGE> PAGE 7
048 K020100 0.000
049 000100 N
050 000100 N
051 000100 N
052 000100 N
053 A000100 N
055 A000100 N
055 B000100 N
056 000100 N
057 000100 N
062 A000100 N
062 B000100 0.0
062 C000100 0.0
062 D000100 0.0
062 E000100 0.0
062 F000100 0.0
062 G000100 0.0
062 H000100 0.0
062 I000100 0.0
062 J000100 0.0
062 K000100 0.0
062 L000100 0.0
062 M000100 0.0
062 N000100 0.0
062 O000100 0.0
062 P000100 0.0
062 Q000100 0.0
062 R000100 0.0
066 A000100 Y
066 B000100 N
066 C000100 Y
066 D000100 N
066 E000100 N
066 F000100 N
066 G000100 N
067 000100 N
068 A000100 N
068 B000100 N
069 000100 N
070 A010100 Y
070 A020100 N
070 B010100 Y
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 Y
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 Y
070 F020100 N
<PAGE> PAGE 8
070 G010100 Y
070 G020100 N
070 H010100 Y
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 Y
070 M010100 Y
070 M020100 Y
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
071 A000100 383304
071 B000100 416468
071 C000100 332724
071 D000100 115
072 A000100 12
072 B000100 237
072 C000100 3518
072 D000100 0
072 E000100 0
072 F000100 2506
072 G000100 0
072 H000100 0
072 I000100 645
072 J000100 141
072 K000100 57
072 L000100 77
072 M000100 41
072 N000100 0
072 O000100 0
072 P000100 0
072 Q000100 0
072 R000100 38
072 S000100 72
072 T000100 2507
072 U000100 0
072 V000100 0
072 W000100 283
<PAGE> PAGE 9
072 X000100 6366
072 Y000100 0
072 Z000100 -2611
072AA000100 52248
072BB000100 0
072CC010100 29149
072CC020100 0
072DD010100 0
072DD020100 0
072EE000100 23919
073 A010100 0.0000
073 A020100 0.0000
073 B000100 1.0300
073 C000100 0.0000
074 A000100 5
074 B000100 0
074 C000100 235
074 D000100 0
074 E000100 0
074 F000100 378896
074 G000100 0
074 H000100 0
074 I000100 0
074 J000100 4238
074 K000100 215
074 L000100 289
074 M000100 4
074 N000100 383882
074 O000100 5189
074 P000100 329
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 225
074 S000100 0
074 T000100 378139
074 U010100 24396
074 U020100 12922
074 V010100 15.55
074 V020100 15.46
074 W000100 0.0000
074 X000100 36984
074 Y000100 0
075 A000100 0
075 B000100 315523
076 000100 0.00
013 A000201 DELOITTE & TOUCHE
013 B010201 BOSTON
013 B020201 MA
013 B030201 02110
<PAGE> PAGE 10
013 B040201 1617
015 A000201 STATE STREET BANK AND TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02110
015 E010201 X
024 000200 N
028 A010200 76822
028 A020200 512
028 A030200 0
028 A040200 57180
028 B010200 42392
028 B020200 474
028 B030200 0
028 B040200 54416
028 C010200 73189
028 C020200 533
028 C030200 0
028 C040200 74643
028 D010200 82732
028 D020200 490
028 D030200 0
028 D040200 72802
028 E010200 93545
028 E020200 497
028 E030200 0
028 E040200 87896
028 F010200 63873
028 F020200 524
028 F030200 0
028 F040200 76868
028 G010200 432552
028 G020200 3031
028 G030200 0
028 G040200 423804
028 H000200 0
029 000200 N
030 A000200 0
030 B000200 0.00
030 C000200 0.00
034 000200 Y
035 000200 770
036 A000200 N
036 B000200 0
037 000200 N
038 000200 0
040 000200 Y
041 000200 Y
042 A000200 0
042 B000200 0
<PAGE> PAGE 11
042 C000200 2
042 D000200 98
042 E000200 0
042 F000200 0
042 G000200 0
042 H000200 0
043 000200 2015
044 000200 0
045 000200 Y
046 000200 N
047 000200 Y
048 000200 0.550
048 A010200 0
048 A020200 0.000
048 B010200 0
048 B020200 0.000
048 C010200 0
048 C020200 0.000
048 D010200 0
048 D020200 0.000
048 E010200 0
048 E020200 0.000
048 F010200 0
048 F020200 0.000
048 G010200 0
048 G020200 0.000
048 H010200 0
048 H020200 0.000
048 I010200 0
048 I020200 0.000
048 J010200 0
048 J020200 0.000
048 K010200 0
048 K020200 0.000
049 000200 N
050 000200 N
051 000200 N
052 000200 N
053 A000200 Y
053 C000200 Y
055 A000200 N
055 B000200 N
056 000200 Y
057 000200 N
062 A000200 Y
062 B000200 0.0
062 C000200 78.5
062 D000200 0.0
062 E000200 0.0
062 F000200 0.0
062 G000200 0.0
<PAGE> PAGE 12
062 H000200 0.0
062 I000200 23.7
062 J000200 0.0
062 K000200 0.0
062 L000200 0.0
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 -2.2
063 A000200 50
063 B000200 0.0
064 A000200 N
066 A000200 N
067 000200 N
068 A000200 N
068 B000200 N
069 000200 N
070 A010200 Y
070 A020200 Y
070 B010200 N
070 B020200 N
070 C010200 N
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 N
070 E020200 N
070 F010200 N
070 F020200 N
070 G010200 N
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 N
070 J020200 N
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
<PAGE> PAGE 13
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200 0
071 B000200 0
071 C000200 0
071 D000200 0
072 A000200 12
072 B000200 11606
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 1135
072 G000200 0
072 H000200 0
072 I000200 451
072 J000200 43
072 K000200 77
072 L000200 55
072 M000200 38
072 N000200 0
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 29
072 S000200 4
072 T000200 2015
072 U000200 0
072 V000200 0
072 W000200 297
072 X000200 4144
072 Y000200 206
072 Z000200 7669
072AA000200 0
072BB000200 0
072CC010200 0
072CC020200 0
072DD010200 7669
072DD020200 7434
072EE000200 0
073 A010200 0.0500
073 A020200 0.0400
073 B000200 0.0000
073 C000200 0.0000
074 A000200 81
074 B000200 0
074 C000200 181311
074 D000200 0
074 E000200 0
074 F000200 0
<PAGE> PAGE 14
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 1251
074 L000200 0
074 M000200 3
074 N000200 182646
074 O000200 0
074 P000200 5055
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 219
074 S000200 0
074 T000200 177372
074 U010200 177372
074 U020200 166519
074 V010200 1.00
074 V020200 1.00
074 W000200 0.9999
074 X000200 16143
074 Y000200 0
075 A000200 206280
075 B000200 0
076 000200 0.00
013 A000301 ERNST & YOUNG
013 B010301 BOSTON
013 B020301 MA
013 B030301 02116
015 A000301 INVESTORS BANK AND TRUST COMPANY
015 B000301 C
015 C010301 BOSTON
015 C020301 MA
015 C030301 02110
015 E010301 X
024 000300 N
028 A010300 5141
028 A020300 331
028 A030300 0
028 A040300 2344
028 B010300 4451
028 B020300 0
028 B030300 0
028 B040300 1705
028 C010300 5700
028 C020300 0
028 C030300 0
028 C040300 2525
028 D010300 4773
<PAGE> PAGE 15
028 D020300 1024
028 D030300 0
028 D040300 2152
028 E010300 8083
028 E020300 0
028 E030300 0
028 E040300 2019
028 F010300 4891
028 F020300 0
028 F030300 0
028 F040300 5935
028 G010300 33040
028 G020300 1356
028 G030300 0
028 G040300 16680
028 H000300 8094
029 000300 Y
030 A000300 256
030 B000300 4.75
030 C000300 0.00
031 A000300 40
031 B000300 0
032 000300 216
033 000300 0
034 000300 Y
035 000300 110
036 A000300 N
036 B000300 0
037 000300 N
038 000300 0
039 000300 N
040 000300 Y
041 000300 Y
042 A000300 0
042 B000300 0
042 C000300 0
042 D000300 100
042 E000300 0
042 F000300 0
042 G000300 0
042 H000300 0
043 000300 1010
044 000300 0
045 000300 Y
046 000300 N
047 000300 Y
048 000300 0.600
048 A010300 0
048 A020300 0.000
048 B010300 0
048 B020300 0.000
<PAGE> PAGE 16
048 C010300 0
048 C020300 0.000
048 D010300 0
048 D020300 0.000
048 E010300 0
048 E020300 0.000
048 F010300 0
048 F020300 0.000
048 G010300 0
048 G020300 0.000
048 H010300 0
048 H020300 0.000
048 I010300 0
048 I020300 0.000
048 J010300 0
048 J020300 0.000
048 K010300 0
048 K020300 0.000
049 000300 N
050 000300 N
051 000300 N
052 000300 N
053 A000300 Y
053 B000300 N
053 C000300 Y
055 A000300 N
055 B000300 N
056 000300 Y
057 000300 N
062 A000300 N
062 B000300 0.0
062 C000300 0.0
062 D000300 0.0
062 E000300 0.0
062 F000300 0.0
062 G000300 0.0
062 H000300 0.0
062 I000300 0.0
062 J000300 0.0
062 K000300 0.0
062 L000300 0.0
062 M000300 0.0
062 N000300 0.0
062 O000300 0.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
063 A000300 0
063 B000300 0.0
066 A000300 Y
066 B000300 N
<PAGE> PAGE 17
066 C000300 N
066 D000300 N
066 E000300 N
066 F000300 N
066 G000300 Y
067 000300 N
068 A000300 N
068 B000300 Y
069 000300 N
070 A010300 Y
070 A020300 N
070 B010300 Y
070 B020300 N
070 C010300 Y
070 C020300 Y
070 D010300 Y
070 D020300 N
070 E010300 Y
070 E020300 N
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 Y
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 N
070 R020300 N
071 A000300 113399
071 B000300 85937
071 C000300 147437
071 D000300 58
072 A000300 12
072 B000300 4911
<PAGE> PAGE 18
072 C000300 1464
072 D000300 0
072 E000300 -163
072 F000300 749
072 G000300 0
072 H000300 0
072 I000300 232
072 J000300 108
072 K000300 53
072 L000300 82
072 M000300 33
072 N000300 0
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 52
072 S000300 12
072 T000300 1010
072 U000300 7
072 V000300 0
072 W000300 171
072 X000300 2509
072 Y000300 95
072 Z000300 3798
072AA000300 4195
072BB000300 0
072CC010300 7978
072CC020300 0
072DD010300 2279
072DD020300 1013
072EE000300 691
073 A010300 0.3700
073 A020300 0.2800
073 B000300 0.0000
073 C000300 0.0500
074 A000300 8
074 B000300 0
074 C000300 3279
074 D000300 61465
074 E000300 0
074 F000300 96546
074 G000300 0
074 H000300 25
074 I000300 0
074 J000300 62
074 K000300 386
074 L000300 4295
074 M000300 27
074 N000300 166092
074 O000300 2170
074 P000300 261
<PAGE> PAGE 19
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 119
074 R040300 1953
074 S000300 0
074 T000300 161589
074 U010300 9734
074 U020300 5041
074 V010300 16.63
074 V020300 16.58
074 W000300 0.0000
074 X000300 11779
074 Y000300 0
075 A000300 0
075 B000300 147648
076 000300 0.00
SIGNATURE JAMES O. YOST
TITLE ASSISTANT TREASURER
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS MANAGED
SECTORS FUND CLASS A AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>011
<NAME> MFS MANAGED SECTORS FUND CLASS A
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 312,924,301
<INVESTMENTS-AT-VALUE> 379,130,566
<RECEIVABLES> 4,742,334
<ASSETS-OTHER> 4,251
<OTHER-ITEMS-ASSETS> 5,153
<TOTAL-ASSETS> 383,882,304
<PAYABLE-FOR-SECURITIES> 5,189,353
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 553,468
<TOTAL-LIABILITIES> 5,742,821
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 267,105,314
<SHARES-COMMON-STOCK> 11,473,932
<SHARES-COMMON-PRIOR> 9,062,715
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 69,538
<ACCUMULATED-NET-GAINS> 44,897,442
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 66,206,265
<NET-ASSETS> 378,139,483
<DIVIDEND-INCOME> 3,518,412
<INTEREST-INCOME> 236,983
<OTHER-INCOME> 0
<EXPENSES-NET> 6,366,178
<NET-INVESTMENT-INCOME> (2,610,783)
<REALIZED-GAINS-CURRENT> 52,247,905
<APPREC-INCREASE-CURRENT> 29,148,730
<NET-CHANGE-FROM-OPS> 78,785,852
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 8,991,673
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,546,423
<NUMBER-OF-SHARES-REDEEMED> 1,829,247
<SHARES-REINVESTED> 694,041
<NET-CHANGE-IN-ASSETS> 42,586,894
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 19,135,268
<OVERDISTRIB-NII-PRIOR> 25,403
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,505,884
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,366,178
<AVERAGE-NET-ASSETS> 333,995,633
<PER-SHARE-NAV-BEGIN> 13.41
<PER-SHARE-NII> (0.05)
<PER-SHARE-GAIN-APPREC> 3.22
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 1.03
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.55
<EXPENSE-RATIO> 1.46
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS MANAGED
SECTORS FUND CLASS B AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>012
<NAME> MFS MANAGED SECTORS FUND CLASS B
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 312,924,301
<INVESTMENTS-AT-VALUE> 379,130,566
<RECEIVABLES> 4,742,334
<ASSETS-OTHER> 4,251
<OTHER-ITEMS-ASSETS> 5,153
<TOTAL-ASSETS> 383,882,304
<PAYABLE-FOR-SECURITIES> 5,189,353
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 553,468
<TOTAL-LIABILITIES> 5,742,821
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 267,105,314
<SHARES-COMMON-STOCK> 12,921,596
<SHARES-COMMON-PRIOR> 16,033,265
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 69,538
<ACCUMULATED-NET-GAINS> 44,897,442
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 66,206,265
<NET-ASSETS> 378,139,483
<DIVIDEND-INCOME> 3,518,412
<INTEREST-INCOME> 236,983
<OTHER-INCOME> 0
<EXPENSES-NET> 6,366,178
<NET-INVESTMENT-INCOME> (2,610,783)
<REALIZED-GAINS-CURRENT> 52,247,905
<APPREC-INCREASE-CURRENT> 29,148,730
<NET-CHANGE-FROM-OPS> 78,785,852
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 14,927,407
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 5,728,388
<NUMBER-OF-SHARES-REDEEMED> 10,002,205
<SHARES-REINVESTED> 1,162,148
<NET-CHANGE-IN-ASSETS> 42,586,894
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 19,135,268
<OVERDISTRIB-NII-PRIOR> 25,403
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 2,505,884
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 6,366,178
<AVERAGE-NET-ASSETS> 333,995,633
<PER-SHARE-NAV-BEGIN> 13.35
<PER-SHARE-NII> (0.14)
<PER-SHARE-GAIN-APPREC> 3.20
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.95
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 15.46
<EXPENSE-RATIO> 2.18
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS CASH RESERVE
FUND CLASS A AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>021
<NAME> MFS CASH RESERVE FUND CLASS A
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 181,310,762
<INVESTMENTS-AT-VALUE> 181,310,762
<RECEIVABLES> 1,250,741
<ASSETS-OTHER> 3,028
<OTHER-ITEMS-ASSETS> 81,058
<TOTAL-ASSETS> 182,645,589
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,274,002
<TOTAL-LIABILITIES> 5,274,002
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 177,371,587
<SHARES-COMMON-STOCK> 10,852,198
<SHARES-COMMON-PRIOR> 2,156,434
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 177,371,587
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11,606,334
<OTHER-INCOME> 0
<EXPENSES-NET> 3,937,530
<NET-INVESTMENT-INCOME> 7,668,804
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 7,668,804
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 234,719
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 21,839,588
<NUMBER-OF-SHARES-REDEEMED> 13,354,949
<SHARES-REINVESTED> 211,125
<NET-CHANGE-IN-ASSETS> (38,419,713)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,134,567
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,143,810
<AVERAGE-NET-ASSETS> 206,279,576
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.05
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.00
<PER-SHARE-DISTRIBUTIONS> 0.05
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.90
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION
EXTRACTED FROM THE FINANCIAL STATEMENTS OF MFS CASH RESERVE
FUND CLASS B AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE
TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>022
<NAME> MFS CASH RESERVE FUND CLASS B
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 181,310,762
<INVESTMENTS-AT-VALUE> 181,310,762
<RECEIVABLES> 1,250,741
<ASSETS-OTHER> 3,028
<OTHER-ITEMS-ASSETS> 81,058
<TOTAL-ASSETS> 182,645,589
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5,274,002
<TOTAL-LIABILITIES> 5,274,002
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 177,371,587
<SHARES-COMMON-STOCK> 166,519,389
<SHARES-COMMON-PRIOR> 213,634,866
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 177,371,587
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 11,606,334
<OTHER-INCOME> 0
<EXPENSES-NET> 3,937,530
<NET-INVESTMENT-INCOME> 7,668,804
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 7,668,804
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 7,434,085
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 814,926,201
<NUMBER-OF-SHARES-REDEEMED> 868,183,399
<SHARES-REINVESTED> 6,141,721
<NET-CHANGE-IN-ASSETS> (38,419,713)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1,134,567
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 4,143,810
<AVERAGE-NET-ASSETS> 206,279,576
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.00
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> 0.04
<PER-SHARE-DISTRIBUTIONS> 0.04
<RETURNS-OF-CAPITAL> 0.00
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 1.93
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF MFS WORLD ASSET ALLOCATION FUND CLASS A FOR THE
YEAR ENDED AUGUST 31, 1995, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>031
<NAME> MFS WORLD ASSET ALLOCATION FUND CLASS A
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 153,270,585
<INVESTMENTS-AT-VALUE> 161,314,940
<RECEIVABLES> 4,742,309
<ASSETS-OTHER> 27,445
<OTHER-ITEMS-ASSETS> 7,627
<TOTAL-ASSETS> 166,092,321
<PAYABLE-FOR-SECURITIES> 2,169,330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,333,939
<TOTAL-LIABILITIES> 4,503,269
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 147,578,245
<SHARES-COMMON-STOCK> 3,526,991
<SHARES-COMMON-PRIOR> 1,647,855
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (823,582)
<ACCUMULATED-NET-GAINS> 5,959,132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,875,257
<NET-ASSETS> 161,589,052
<DIVIDEND-INCOME> 1,301,297
<INTEREST-INCOME> 4,911,152
<OTHER-INCOME> 0
<EXPENSES-NET> 2,414,498
<NET-INVESTMENT-INCOME> 3,797,951
<REALIZED-GAINS-CURRENT> 4,195,488
<APPREC-INCREASE-CURRENT> 7,977,967
<NET-CHANGE-FROM-OPS> 15,971,406
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,026,466)
<DISTRIBUTIONS-OF-GAINS> (258,501)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2,594,208
<NUMBER-OF-SHARES-REDEEMED> (787,357)
<SHARES-REINVESTED> 72,285
<NET-CHANGE-IN-ASSETS> 106,405,326
<ACCUMULATED-NII-PRIOR> 111,814
<ACCUMULATED-GAINS-PRIOR> 226
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 748,715
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,509,366
<AVERAGE-NET-ASSETS> 124,494,417
<PER-SHARE-NAV-BEGIN> 15.33
<PER-SHARE-NII> 0.55
<PER-SHARE-GAIN-APPREC> 1.17
<PER-SHARE-DIVIDEND> (0.37)
<PER-SHARE-DISTRIBUTIONS> (0.05)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.63
<EXPENSE-RATIO> 1.47
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF MFS WORLD ASSET ALLOCATION FUND CLASS B FO
PERIOD ENDED AUGUST 31, 1995, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>032
<NAME> MFS WORLD ASSET ALLOCATION FUND CLASS B
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 153,270,585
<INVESTMENTS-AT-VALUE> 161,314,940
<RECEIVABLES> 4,742,309
<ASSETS-OTHER> 27,445
<OTHER-ITEMS-ASSETS> 7,627
<TOTAL-ASSETS> 166,092,321
<PAYABLE-FOR-SECURITIES> 2,169,330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,333,939
<TOTAL-LIABILITIES> 4,503,269
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 147,578,245
<SHARES-COMMON-STOCK> 5,040,791
<SHARES-COMMON-PRIOR> 1,730,601
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (823,582)
<ACCUMULATED-NET-GAINS> 5,959,132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,875,257
<NET-ASSETS> 161,589,052
<DIVIDEND-INCOME> 1,301,297
<INTEREST-INCOME> 4,911,152
<OTHER-INCOME> 0
<EXPENSES-NET> 2,414,498
<NET-INVESTMENT-INCOME> 3,797,951
<REALIZED-GAINS-CURRENT> 4,195,488
<APPREC-INCREASE-CURRENT> 7,977,967
<NET-CHANGE-FROM-OPS> 15,971,406
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1,012,521)
<DISTRIBUTIONS-OF-GAINS> (350,041)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 3,914,029
<NUMBER-OF-SHARES-REDEEMED> (675,931)
<SHARES-REINVESTED> 72,092
<NET-CHANGE-IN-ASSETS> 106,405,326
<ACCUMULATED-NII-PRIOR> 111,814
<ACCUMULATED-GAINS-PRIOR> 226
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 748,715
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,509,366
<AVERAGE-NET-ASSETS> 124,494,417
<PER-SHARE-NAV-BEGIN> 15.31
<PER-SHARE-NII> 0.43
<PER-SHARE-GAIN-APPREC> 1.17
<PER-SHARE-DIVIDEND> (0.28)
<PER-SHARE-DISTRIBUTIONS> (0.05)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.58
<EXPENSE-RATIO> 2.24
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
<TABLE> <S> <C>
<ARTICLE> 6
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM
THE FINANCIAL STATEMENTS OF MFS WORLD ASSET ALLOCATION FUND CLASS C FOR THE
PERIOD ENDED AUGUST 31, 1995, AND IS QUALIFIED IN ITS ENTIRETY BY
REFERENCE TO SUCH FINANCIAL STATEMENTS.
</LEGEND>
<SERIES>
<NUMBER>033
<NAME> MFS WORLD ASSET ALLOCATION FUND CLASS C
<S> <C>
<PERIOD-TYPE> YEAR
<FISCAL-YEAR-END> AUG-31-1995
<PERIOD-END> AUG-31-1995
<INVESTMENTS-AT-COST> 153,270,585
<INVESTMENTS-AT-VALUE> 161,314,940
<RECEIVABLES> 4,742,309
<ASSETS-OTHER> 27,445
<OTHER-ITEMS-ASSETS> 7,627
<TOTAL-ASSETS> 166,092,321
<PAYABLE-FOR-SECURITIES> 2,169,330
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 2,333,939
<TOTAL-LIABILITIES> 4,503,269
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 147,578,245
<SHARES-COMMON-STOCK> 1,165,926
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (823,582)
<ACCUMULATED-NET-GAINS> 5,959,132
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 8,875,257
<NET-ASSETS> 161,589,052
<DIVIDEND-INCOME> 1,301,297
<INTEREST-INCOME> 4,911,152
<OTHER-INCOME> 0
<EXPENSES-NET> 2,414,498
<NET-INVESTMENT-INCOME> 3,797,951
<REALIZED-GAINS-CURRENT> 4,195,488
<APPREC-INCREASE-CURRENT> 7,977,967
<NET-CHANGE-FROM-OPS> 15,971,406
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (239,932)
<DISTRIBUTIONS-OF-GAINS> (82,468)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1,198,363
<NUMBER-OF-SHARES-REDEEMED> (273,394)
<SHARES-REINVESTED> 16,620
<NET-CHANGE-IN-ASSETS> 106,405,326
<ACCUMULATED-NII-PRIOR> 111,814
<ACCUMULATED-GAINS-PRIOR> 226
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 748,715
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> 2,509,366
<AVERAGE-NET-ASSETS> 124,494,417
<PER-SHARE-NAV-BEGIN> 15.31
<PER-SHARE-NII> 0.46
<PER-SHARE-GAIN-APPREC> 1.16
<PER-SHARE-DIVIDEND> (0.30)
<PER-SHARE-DISTRIBUTIONS> (0.05)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 16.58
<EXPENSE-RATIO> 2.18
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
