MFS SERIES TRUST IV
NSAR-B, 1997-10-29
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<PAGE>      PAGE  1
000 B000000 08/31/97
000 C000000 0000063068
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 IV
001 B000000 811-2594
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  4
007 C010100  1
007 C020100 MFS MONEY MARKET FUND
007 C030100 N
007 C010200  2
007 C020200 MFS GOVERNMENT MONEY MARKET FUND
007 C030200 N
007 C010300  3
007 C020300 MFS MUNICIPAL BOND FUND
007 C030300 N
007 C010400  4
007 C020400 MFS OTC FUND
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
007 C011100 11
007 C011200 12
007 C011300 13
007 C011400 14
007 C011500 15
007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
007 C012100 21
<PAGE>      PAGE  2
007 C012200 22
007 C012300 23
007 C012400 24
007 C012500 25
007 C012600 26
007 C012700 27
007 C012800 28
007 C012900 29
007 C013000 30
007 C013100 31
007 C013200 32
007 C013300 33
007 C013400 34
007 C013500 35
007 C013600 36
007 C013700 37
007 C013800 38
007 C013900 39
007 C014000 40
007 C014100 41
007 C014200 42
007 C014300 43
007 C014400 44
007 C014500 45
007 C014600 46
007 C014700 47
007 C014800 48
007 C014900 49
007 C015000 50
007 C015100 51
007 C015200 52
007 C015300 53
007 C015400 54
007 C015500 55
007 C015600 56
007 C015700 57
007 C015800 58
007 C015900 59
007 C016000 60
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 FUND DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
<PAGE>      PAGE  3
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02116
013 A00AA01 DELOITTE & TOUCHE LLP
013 B01AA01 BOSTON
013 B02AA01 MA
013 B03AA01 02110
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   52
019 C00AA00 MASSFINSER
020 A000001 WEEDEN & CO.
020 B000001 13-3364318
020 C000001     32
020 A000002 MERRILL LYNCH
020 B000002 13-5674085
020 C000002     31
020 A000003 CS FIRST BOSTON CORP.
020 B000003 13-5659485
020 C000003     26
020 A000004 MORGAN J.P. SECURITIES INC.
020 B000004 13-3224016
020 C000004     25
020 A000005 DONALDSON LUFTKIN JENNRETTE
020 B000005 13-2741729
020 C000005     23
020 A000006 INSTINET
020 B000006 13-3443395
020 C000006     21
020 A000007 GOLDMAN SACHS
020 B000007 13-5108880
020 C000007     13
020 A000008 BERNSTIEN
020 B000008 13-2625874
020 C000008     12
020 A000009 SMITH BARNET INC.
020 B000009 13-1912900
020 C000009     11
020 A000010 DEAN WITTER, REYNOLDS, INC.
020 B000010 00-0000000
020 C000010     10
021  000000      325
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001  24537315
022 D000001    127182
022 A000002 PAINE WEBBER INC
022 B000002 13-2638166
022 C000002    918714
022 D000002    997127
<PAGE>      PAGE  4
022 A000003 MORGAN J.P. SECURITIES
022 B000003 13-3224016
022 C000003    728424
022 D000003    477667
022 A000004 SMITH BARNEY
022 B000004 13-1912900
022 C000004    520362
022 D000004    434455
022 A000005 SHEARSON LEHMAN BROTHERS INC.
022 B000005 13-2518466
022 C000005    660417
022 D000005    158397
022 A000006 MERRILL LYNCH
022 B000006 13-5674085
022 C000006    579415
022 D000006    178965
022 A000007 GENERAL ELECTRIC
022 B000007 00-0000000
022 C000007    528294
022 D000007         0
022 A000008 BANK OF AMERICA
022 B000008 00-0000000
022 C000008    493223
022 D000008       998
022 A000009 DILLON, READ & CO.
022 B000009 13-1939216
022 C000009    240171
022 D000009    239457
022 A000010 CITIBANK
022 B000010 00-0000000
022 C000010    258366
022 D000010    219540
023 C000000   32848143
023 D000000    4272875
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
<PAGE>      PAGE  5
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
074 O000000        0
074 P000000        0
074 Q000000        0
074 R010000        0
074 R020000        0
074 R030000        0
074 R040000        0
074 S000000        0
074 T000000        0
074 U010000        0
074 U020000        0
074 V010000     0.00
074 V020000     0.00
074 W000000   0.0000
074 X000000        0
074 Y000000        0
077 A000000 Y
077 B000000 Y
077 D000000 Y
077 I000000 Y
077 Q010000 Y
078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE COMPANY
080 B00AA00 CHUBB INSURANCE COMPANY
080 C00AA00    75000
081 A00AA00 Y
081 B00AA00 123
082 A00AA00 Y
082 B00AA00      100
083 A00AA00 N
083 B00AA00        0
084 A00AA00 N
084 B00AA00        0
085 A00AA00 Y
085 B00AA00 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
<PAGE>      PAGE  6
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
015 A000101 STATE STREET BANK & TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
015 E010101 X
015 A000102 THE BANK OF NEW YORK
015 B000102 S
015 C010102 NEW YORK
015 C020102 NY
015 C030102 10286
015 E010102 X
024  000100 Y
025 A000101 GOLDMAN SACHS
025 B000101 135108880
025 C000101 D
025 D000101  126151
025 A000102 BANK OF AMERICA
025 C000102 D
025 D000102    9963
025 A000103 MERRILL LYNCH & CO.
025 B000103 135674085
025 C000103 D
025 D000103   20653
025 A000104 BANKERS TRUST
025 C000104 D
025 D000104    7346
025 A000105 FORD MOTOR CREDIT CORP.
025 C000105 D
025 D000105   21952
025 A000106 MORGAN J.P. & CO.
025 B000106 13-3224016
025 C000106 D
025 D000106   17891
025 D000107       0
025 D000108       0
028 A010100    704664
028 A020100      1934
028 A030100         0
028 A040100    620736
028 B010100    693417
028 B020100      1882
028 B030100         0
028 B040100    898913
028 C010100    763031
028 C020100      1862
028 C030100         0
<PAGE>      PAGE  7
028 C040100    759171
028 D010100    801623
028 D020100      1991
028 D030100         0
028 D040100    714638
028 E010100    654441
028 E020100      1751
028 E030100         0
028 E040100    782979
028 F010100   1063326
028 F020100      1980
028 F030100         0
028 F040100    940835
028 G010100   4680502
028 G020100     11400
028 G030100         0
028 G040100   4717272
028 H000100   4680502
029  000100 N
030 A000100      0
030 B000100  0.00
030 C000100  0.00
031 A000100      0
031 B000100      0
032  000100      0
033  000100      0
034  000100 N
035  000100      0
036 B000100      0
037  000100 N
038  000100      0
039  000100 N
040  000100 N
041  000100 N
042 A000100   0
042 B000100   0
042 C000100   0
042 D000100   0
042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
043  000100      0
044  000100      0
045  000100 Y
046  000100 N
047  000100 Y
048  000100  0.000
048 A010100   300000
048 A020100 0.500
048 B010100   400000
<PAGE>      PAGE  8
048 B020100 0.450
048 C010100   300000
048 C020100 0.400
048 D010100        0
048 D020100 0.350
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  1000000
048 K020100 0.350
049  000100 N
050  000100 N
051  000100 N
052  000100 N
053 A000100 Y
053 B000100 N
053 C000100 Y
055 A000100 N
055 B000100 N
056  000100 Y
057  000100 N
058 A000100 N
059  000100 Y
060 A000100 Y
060 B000100 Y
061  000100     1000
062 A000100 Y
062 B000100   0.0
062 C000100  35.4
062 D000100  16.5
062 E000100   0.0
062 F000100   0.0
062 G000100   0.0
062 H000100   0.0
062 I000100  48.9
062 J000100   0.0
062 K000100   0.0
062 L000100  -0.8
062 M000100   0.0
062 N000100   0.0
062 O000100   0.0
062 P000100   0.0
<PAGE>      PAGE  9
062 Q000100   0.0
062 R000100   0.0
063 A000100  39
063 B000100  0.0
064 A000100 N
064 B000100 N
066 A000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 N
070 A010100 Y
070 A020100 Y
070 B010100 N
070 B020100 N
070 C010100 N
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 N
070 E020100 N
070 F010100 N
070 F020100 N
070 G010100 N
070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 N
070 J020100 N
070 K010100 Y
070 K020100 N
070 L010100 Y
070 L020100 N
070 M010100 N
070 M020100 N
070 N010100 N
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   4856040
071 B000100   4858028
071 C000100         0
071 D000100    0
<PAGE>      PAGE  10
072 A000100 12
072 B000100    32078
072 C000100        0
072 D000100        0
072 E000100        0
072 F000100     2793
072 G000100       46
072 H000100        0
072 I000100      800
072 J000100      258
072 K000100      146
072 L000100      114
072 M000100       40
072 N000100        0
072 O000100        0
072 P000100        0
072 Q000100      253
072 R000100       27
072 S000100        6
072 T000100        0
072 U000100        0
072 V000100        0
072 W000100      223
072 X000100     4706
072 Y000100      215
072 Z000100    27587
072AA000100        0
072BB000100        0
072CC010100        0
072CC020100        0
072DD010100    27587
072DD020100        0
072EE000100        0
073 A010100   0.0500
073 A020100   0.0000
073 B000100   0.0000
073 C000100   0.0000
074 A000100      429
074 B000100   104630
074 C000100   534811
074 D000100        0
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        0
074 L000100    57372
074 M000100        5
074 N000100   697247
<PAGE>      PAGE  11
074 O000100    62626
074 P000100       30
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100      351
074 S000100        0
074 T000100   634240
074 U010100   634240
074 U020100        0
074 V010100     1.00
074 V020100     0.00
074 W000100   0.9999
074 X000100    50500
074 Y000100        0
075 A000100   585736
075 B000100        0
076  000100     0.00
015 A000201 STATE STREET BANK & TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02110
015 E010201 X
015 A000202 THE BANK OF NEW YORK
015 B000202 S
015 C010202 NEW YORK
015 C020202 NY
015 C030202 10286
015 E010202 X
024  000200 Y
025 A000201 GOLDMAN SACHS
025 B000201 135108880
025 C000201 D
025 D000201    5950
025 D000202       0
025 D000203       0
025 D000204       0
025 D000205       0
025 D000206       0
025 D000207       0
025 D000208       0
028 A010200      1410
028 A020200       140
028 A030200         0
028 A040200      2997
028 B010200      5496
028 B020200       124
028 B030200         0
028 B040200      2364
<PAGE>      PAGE  12
028 C010200      2065
028 C020200       129
028 C030200         0
028 C040200      3852
028 D010200      1376
028 D020200       130
028 D030200         0
028 D040200      3482
028 E010200     24382
028 E020200       133
028 E030200         0
028 E040200     21734
028 F010200     46027
028 F020200       137
028 F030200         0
028 F040200     45913
028 G010200     80756
028 G020200       793
028 G030200         0
028 G040200     80342
028 H000200         0
029  000200 N
030 A000200      0
030 B000200  0.00
030 C000200  0.00
031 A000200      0
031 B000200      0
032  000200      0
033  000200      0
034  000200 N
035  000200      0
036 B000200      0
037  000200 N
038  000200      0
039  000200 N
040  000200 N
041  000200 N
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200   0
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200      0
044  000200      0
045  000200 Y
046  000200 N
047  000200 Y
048  000200  0.000
<PAGE>      PAGE  13
048 A010200   300000
048 A020200 0.500
048 B010200   400000
048 B020200 0.450
048 C010200   300000
048 C020200 0.400
048 D010200        0
048 D020200 0.350
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  1000000
048 K020200 0.350
049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 N
053 C000200 Y
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 Y
060 B000200 Y
061  000200     1000
062 A000200 Y
062 B000200   0.0
062 C000200 104.9
062 D000200  15.5
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
062 L000200 -20.4
062 M000200   0.0
<PAGE>      PAGE  14
062 N000200   0.0
062 O000200   0.0
062 P000200   0.0
062 Q000200   0.0
062 R000200   0.0
063 A000200  41
063 B000200  0.0
064 A000200 N
064 B000200 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 N
070 L020200 N
070 M010200 N
070 M020200 N
070 N010200 N
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 N
070 R020200 N
071 A000200    252736
<PAGE>      PAGE  15
071 B000200    248380
071 C000200         0
071 D000200    0
072 A000200 12
072 B000200     2034
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200      188
072 G000200        3
072 H000200        0
072 I000200       51
072 J000200       22
072 K000200        7
072 L000200        4
072 M000200        5
072 N000200        0
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072 P000200        0
072 Q000200        0
072 R000200       26
072 S000200        3
072 T000200        0
072 U000200        0
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072 X000200      356
072 Y000200       15
072 Z000200     1693
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072BB000200        0
072CC010200        0
072CC020200        0
072DD010200     1693
072DD020200        0
072EE000200        0
073 A010200   0.0500
073 A020200   0.0000
073 B000200   0.0000
073 C000200   0.0000
074 A000200       24
074 B000200     5950
074 C000200    40281
074 D000200        0
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200        0
074 J000200        0
074 K000200        0
<PAGE>      PAGE  16
074 L000200       74
074 M000200        1
074 N000200    46330
074 O000200     7908
074 P000200        2
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200       33
074 S000200        0
074 T000200    38387
074 U010200    38387
074 U020200        0
074 V010200     1.00
074 V020200     0.00
074 W000200   0.9999
074 X000200     2204
074 Y000200        0
075 A000200    42127
075 B000200        0
076  000200     0.00
015 A000301 STATE STREET BANK & TRUST COMPANY
015 B000301 C
015 C010301 BOSTON
015 C020301 MA
015 C030301 02110
015 E010301 X
015 A000302 THE BANK OF NEW YORK
015 B000302 S
015 C010302 NEW YORK
015 C020302 NY
015 C030302 10286
015 E010302 X
015 A000303 CHEMICAL BANK
015 B000303 S
015 C010303 NEW YORK
015 C020303 NY
015 C030303 10041
015 E010303 X
015 A000304 MORGAN GUARANTY TRUST COMPANY
015 B000304 S
015 C010304 NEW YORK
015 C020304 NY
015 C030304 10015
015 E010304 X
015 A000305 BANKERS TRUST COMPANY
015 B000305 S
015 C010305 NEW YORK
015 C020305 NY
015 C030305 10015
<PAGE>      PAGE  17
015 E010305 X
024  000300 N
028 A010300     57077
028 A020300      4383
028 A030300         0
028 A040300     81591
028 B010300    210840
028 B020300      4336
028 B030300         0
028 B040300    155671
028 C010300    125553
028 C020300      4288
028 C030300         0
028 C040300    161430
028 D010300     80406
028 D020300      4889
028 D030300         0
028 D040300    126872
028 E010300    167270
028 E020300      4244
028 E030300         0
028 E040300    144759
028 F010300    133403
028 F020300      4064
028 F030300         0
028 F040300    187096
028 G010300    774549
028 G020300     26204
028 G030300         0
028 G040300    857419
028 H000300    760600
029  000300 Y
030 A000300   1087
030 B000300  4.75
030 C000300  0.00
031 A000300    129
031 B000300      0
032  000300    958
033  000300      0
034  000300 Y
035  000300     19
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  91
<PAGE>      PAGE  18
042 D000300   9
042 E000300   0
042 F000300   0
042 G000300   0
042 H000300   0
043  000300    604
044  000300      0
045  000300 Y
046  000300 N
047  000300 N
048  000300  0.000
048 A010300        0
048 A020300 0.000
048 B010300        0
048 B020300 0.000
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 Y
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
058 A000300 N
059  000300 Y
060 A000300 Y
060 B000300 Y
061  000300     1000
062 A000300 Y
062 B000300   0.0
<PAGE>      PAGE  19
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  -1.9
062 M000300   0.0
062 N000300   0.0
062 O000300  94.1
062 P000300   0.0
062 Q000300   7.8
062 R000300   0.0
063 A000300   0
063 B000300 16.2
064 A000300 Y
064 B000300 N
066 A000300 N
067  000300 N
068 A000300 N
068 B000300 N
069  000300 N
070 A010300 Y
070 A020300 N
070 B010300 N
070 B020300 N
070 C010300 Y
070 C020300 N
070 D010300 N
070 D020300 N
070 E010300 Y
070 E020300 Y
070 F010300 N
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 N
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 N
070 L020300 N
070 M010300 N
070 M020300 N
<PAGE>      PAGE  20
070 N010300 N
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   1574346
071 B000300   1850279
071 C000300   1723059
071 D000300   91
072 A000300 12
072 B000300   107441
072 C000300        0
072 D000300        0
072 E000300        0
072 F000300     7364
072 G000300      125
072 H000300        0
072 I000300     2310
072 J000300      449
072 K000300       91
072 L000300       77
072 M000300       82
072 N000300        0
072 O000300        0
072 P000300        0
072 Q000300        0
072 R000300       54
072 S000300       13
072 T000300      606
072 U000300        0
072 V000300        0
072 W000300      521
072 X000300    11692
072 Y000300      357
072 Z000300    96106
072AA000300    30858
072BB000300        0
072CC010300    13108
072CC020300        0
072DD010300    92663
072DD020300     3251
072EE000300        0
073 A010300   0.5700
073 A020300   0.4800
073 B000300   0.0000
073 C000300   0.0000
<PAGE>      PAGE  21
074 A000300       18
074 B000300        0
074 C000300   135620
074 D000300  1634012
074 E000300        0
074 F000300        0
074 G000300        0
074 H000300        0
074 I000300        0
074 J000300    58985
074 K000300        0
074 L000300        0
074 M000300       16
074 N000300  1828651
074 O000300    22771
074 P000300       92
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300    69555
074 S000300        0
074 T000300  1736233
074 U010300   151028
074 U020300     6904
074 V010300    10.99
074 V020300    10.99
074 W000300   0.0000
074 X000300    41579
074 Y000300     1549
075 A000300        0
075 B000300  1828756
076  000300     0.00
015 A000401 INVESTORS BANK & TRUST COMPANY
015 B000401 C
015 C010401 BOSTON
015 C020401 MA
015 C030401 02111
015 E010401 X
015 A000402 THE BANK OF NEW YORK
015 B000402 S
015 C010402 NEW YORK
015 C020402 NY
015 C030402 10286
015 E010402 X
024  000400 N
028 A010400      2133
028 A020400         0
028 A030400         0
028 A040400      4533
028 B010400      2849
<PAGE>      PAGE  22
028 B020400         0
028 B030400         0
028 B040400      3503
028 C010400      8016
028 C020400         2
028 C030400         0
028 C040400      3744
028 D010400      7080
028 D020400        10
028 D030400         0
028 D040400      7336
028 E010400      6876
028 E020400         0
028 E030400         0
028 E040400      5092
028 F010400      3843
028 F020400         9
028 F030400         0
028 F040400      8694
028 G010400     30797
028 G020400        21
028 G030400         0
028 G040400     32902
028 H000400     12141
029  000400 Y
030 A000400    184
030 B000400  5.75
030 C000400  0.00
031 A000400     24
031 B000400      0
032  000400    160
033  000400      0
034  000400 Y
035  000400    144
036 A000400 N
036 B000400      0
037  000400 N
038  000400      0
039  000400 N
040  000400 Y
041  000400 Y
042 A000400   0
042 B000400   0
042 C000400  62
042 D000400  38
042 E000400   0
042 F000400   0
042 G000400   0
042 H000400   0
043  000400    851
044  000400      0
<PAGE>      PAGE  23
045  000400 Y
046  000400 N
047  000400 Y
048  000400  0.750
048 A010400        0
048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
049  000400 N
050  000400 N
051  000400 N
052  000400 N
053 A000400 Y
053 B000400 N
053 C000400 Y
055 A000400 N
055 B000400 N
056  000400 Y
057  000400 N
058 A000400 N
059  000400 Y
060 A000400 N
060 B000400 N
061  000400     1000
062 A000400 N
062 B000400   0.0
062 C000400   0.0
062 D000400   0.0
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
<PAGE>      PAGE  24
062 J000400   0.0
062 K000400   0.0
062 L000400   0.0
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
063 A000400   0
063 B000400  0.0
066 A000400 Y
066 B000400 N
066 C000400 N
066 D000400 Y
066 E000400 N
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 Y
070 B020400 N
070 C010400 Y
070 C020400 N
070 D010400 Y
070 D020400 N
070 E010400 N
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
<PAGE>      PAGE  25
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400    191318
071 B000400    203096
071 C000400    112200
071 D000400  171
072 A000400 12
072 B000400      195
072 C000400      176
072 D000400        0
072 E000400        0
072 F000400      868
072 G000400        8
072 H000400        0
072 I000400      174
072 J000400       32
072 K000400       34
072 L000400       52
072 M000400       18
072 N000400        0
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400       51
072 S000400        5
072 T000400      870
072 U000400        0
072 V000400        0
072 W000400       99
072 X000400     2211
072 Y000400        0
072 Z000400    -1840
072AA000400     2977
072BB000400        0
072CC010400    22800
072CC020400        0
072DD010400        0
072DD020400        0
072EE000400    15691
073 A010400   0.0000
073 A020400   0.0000
073 B000400   1.3200
073 C000400   0.0000
074 A000400     1466
074 B000400        0
074 C000400     1400
<PAGE>      PAGE  26
074 D000400        0
074 E000400        0
074 F000400   119823
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400      969
074 K000400        0
074 L000400        0
074 M000400        1
074 N000400   123659
074 O000400      436
074 P000400       71
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400      294
074 S000400        0
074 T000400   122858
074 U010400     4429
074 U020400     7972
074 V010400     9.42
074 V020400     9.27
074 W000400   0.0000
074 X000400    11884
074 Y000400        0
075 A000400        0
075 B000400   115491
076  000400     0.00
SIGNATURE   ELLEN M. MOYNIHAN                            
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 031
   <NAME> MFS MUNICIPAL BOND FUND - CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                  YEAR
<FISCAL-YEAR-END>                          AUG-31-1997
<PERIOD-START>                             SEP-01-1996
<PERIOD-END>                               AUG-31-1997
<INVESTMENTS-AT-COST>                       1643928799           
<INVESTMENTS-AT-VALUE>                      1769632068
<RECEIVABLES>                                 58985317       
<ASSETS-OTHER>                                   16219
<OTHER-ITEMS-ASSETS>                             17757
<TOTAL-ASSETS>                              1828651361
<PAYABLE-FOR-SECURITIES>                      22770543
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     69647457
<TOTAL-LIABILITIES>                           92418000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1582282968
<SHARES-COMMON-STOCK>                          151027931
<SHARES-COMMON-PRIOR>                          167203931
<ACCUMULATED-NII-CURRENT>                      3311266
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       24880947
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     125758180
<NET-ASSETS>                                1736233361
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            107440862
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                11334472
<NET-INVESTMENT-INCOME>                       96106390
<REALIZED-GAINS-CURRENT>                      30858117
<APPREC-INCREASE-CURRENT>                     13108443
<NET-CHANGE-FROM-OPS>                        140072950
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (92663173)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                      184758268
<NUMBER-OF-SHARES-REDEEMED>                 (206226168)
<SHARES-REINVESTED>                            5291900
<NET-CHANGE-IN-ASSETS>                      (132357420)
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                   (1640397)
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                  (1216893)
<GROSS-ADVISORY-FEES>                         7363899
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                              11691906
<AVERAGE-NET-ASSETS>                       1828755593
<PER-SHARE-NAV-BEGIN>                           10.75
<PER-SHARE-NII>                                   .57
<PER-SHARE-GAIN-APPREC>                           .24
<PER-SHARE-DIVIDEND>                            (.57)
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<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                             10.99
<EXPENSE-RATIO>                                   .60
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                                0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 032
   <NAME> MFS MUNICIPAL BOND FUND - CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                  YEAR
<FISCAL-YEAR-END>                          AUG-31-1997
<PERIOD-START>                             SEP-01-1996
<PERIOD-END>                               AUG-31-1997
<INVESTMENTS-AT-COST>                       1643928799           
<INVESTMENTS-AT-VALUE>                      1769632068
<RECEIVABLES>                                 58985317       
<ASSETS-OTHER>                                   16219
<OTHER-ITEMS-ASSETS>                             17757
<TOTAL-ASSETS>                              1828651361
<PAYABLE-FOR-SECURITIES>                      22770543
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     69647457
<TOTAL-LIABILITIES>                           92418000
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1582282968
<SHARES-COMMON-STOCK>                          6904123
<SHARES-COMMON-PRIOR>                          6599993
<ACCUMULATED-NII-CURRENT>                      3311266
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                       24880947
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     125758180
<NET-ASSETS>                                1736233361
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                            107440862
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                11334472
<NET-INVESTMENT-INCOME>                       96106390
<REALIZED-GAINS-CURRENT>                      30858117
<APPREC-INCREASE-CURRENT>                     13108443
<NET-CHANGE-FROM-OPS>                        140072950
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (3251831)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        2698839
<NUMBER-OF-SHARES-REDEEMED>                  (2574149)
<SHARES-REINVESTED>                             179440
<NET-CHANGE-IN-ASSETS>                     (132357420)
<ACCUMULATED-NII-PRIOR>                             0
<ACCUMULATED-GAINS-PRIOR>                   (1640397)
<OVERDISTRIB-NII-PRIOR>                             0
<OVERDIST-NET-GAINS-PRIOR>                  (1216893)
<GROSS-ADVISORY-FEES>                         7363899
<INTEREST-EXPENSE>                                  0
<GROSS-EXPENSE>                              11691906
<AVERAGE-NET-ASSETS>                       1828755593
<PER-SHARE-NAV-BEGIN>                           10.74
<PER-SHARE-NII>                                   .48
<PER-SHARE-GAIN-APPREC>                           .25
<PER-SHARE-DIVIDEND>                            (.48)
<PER-SHARE-DISTRIBUTIONS>                           0
<RETURNS-OF-CAPITAL>                                0
<PER-SHARE-NAV-END>                             10.99
<EXPENSE-RATIO>                                  1.46
<AVG-DEBT-OUTSTANDING>                              0
<AVG-DEBT-PER-SHARE>                                0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 011
   <NAME> MFS GOVERNMENT MONEY MARKET FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          AUG-31-1997
<PERIOD-END>                               AUG-31-1997
<INVESTMENTS-AT-COST>                         46231141
<INVESTMENTS-AT-VALUE>                        46231141
<RECEIVABLES>                                    74031
<ASSETS-OTHER>                                     318
<OTHER-ITEMS-ASSETS>                             24368
<TOTAL-ASSETS>                                46329858
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      7943341
<TOTAL-LIABILITIES>                            7943341
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      38386517
<SHARES-COMMON-STOCK>                         38386517
<SHARES-COMMON-PRIOR>                         42499447
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<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
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<INTEREST-INCOME>                              2034085
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (341540)
<NET-INVESTMENT-INCOME>                        1692545
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<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                          1692545
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (1692545)
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<NUMBER-OF-SHARES-REDEEMED>                (124367744)
<SHARES-REINVESTED>                            1548739
<NET-CHANGE-IN-ASSETS>                       (4112930)
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<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                               (356255)
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<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.05
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                            (0.05)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.85
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 021
   <NAME> MFS MONEY MARKET FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   12-MOS
<FISCAL-YEAR-END>                          AUG-31-1997
<PERIOD-END>                               AUG-31-1997
<INVESTMENTS-AT-COST>                        639441188
<INVESTMENTS-AT-VALUE>                       639441188
<RECEIVABLES>                                 57372357
<ASSETS-OTHER>                                    4392
<OTHER-ITEMS-ASSETS>                            428933
<TOTAL-ASSETS>                               697246870
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<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     63006939
<TOTAL-LIABILITIES>                           63006939
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     634239931
<SHARES-COMMON-STOCK>                        634239931
<SHARES-COMMON-PRIOR>                        644204922
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
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<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (4491429)
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<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                         27586652
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (27586652)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                     8979377073
<NUMBER-OF-SHARES-REDEEMED>             (901064227858)
<SHARES-REINVESTED>                           21300694
<NET-CHANGE-IN-ASSETS>                       (9964991)      
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                              (4706876)
<AVERAGE-NET-ASSETS>                         585735777
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.05
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                            (0.05)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.80
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 041
   <NAME> MFS OTC FUND A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                              OCT-1-1996
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                        109623378
<INVESTMENTS-AT-VALUE>                       121222974
<RECEIVABLES>                                   969150
<ASSETS-OTHER>                                    1062
<OTHER-ITEMS-ASSETS>                           1465766
<TOTAL-ASSETS>                               123658952
<PAYABLE-FOR-SECURITIES>                        436368
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       364824
<TOTAL-LIABILITIES>                             801192
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     111850491
<SHARES-COMMON-STOCK>                          4429126
<SHARES-COMMON-PRIOR>                          3875873
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (9435)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (582892)
<ACCUM-APPREC-OR-DEPREC>                      11599596
<NET-ASSETS>                                 122857760
<DIVIDEND-INCOME>                               175657
<INTEREST-INCOME>                               195845
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2211199)
<NET-INVESTMENT-INCOME>                      (1839697)
<REALIZED-GAINS-CURRENT>                       2976813
<APPREC-INCREASE-CURRENT>                     19823645
<NET-CHANGE-FROM-OPS>                         20960761
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                     (5360182)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        3045715
<NUMBER-OF-SHARES-REDEEMED>                  (3082448)
<SHARES-REINVESTED>                             589985
<NET-CHANGE-IN-ASSETS>                         8587016
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     13967507
<OVERDISTRIB-NII-PRIOR>                         (5658)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           868526
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2211270
<AVERAGE-NET-ASSETS>                         115491413
<PER-SHARE-NAV-BEGIN>                             9.06
<PER-SHARE-NII>                                 (0.09)
<PER-SHARE-GAIN-APPREC>                           1.77
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.32)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.42
<EXPENSE-RATIO>                                   1.41
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 042
   <NAME> MFS OTC FUND B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             OCT-01-1996
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                        109623378
<INVESTMENTS-AT-VALUE>                       121222974
<RECEIVABLES>                                   969150
<ASSETS-OTHER>                                    1062
<OTHER-ITEMS-ASSETS>                           1465766
<TOTAL-ASSETS>                               123658952
<PAYABLE-FOR-SECURITIES>                        436368
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       364824
<TOTAL-LIABILITIES>                             801192
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     111850491
<SHARES-COMMON-STOCK>                          7972462
<SHARES-COMMON-PRIOR>                          7505225
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (9435)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (582892)
<ACCUM-APPREC-OR-DEPREC>                      11599596
<NET-ASSETS>                                 122857760
<DIVIDEND-INCOME>                               175657
<INTEREST-INCOME>                               195845
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2211199)
<NET-INVESTMENT-INCOME>                      (1839697)
<REALIZED-GAINS-CURRENT>                       2976813
<APPREC-INCREASE-CURRENT>                     19823645
<NET-CHANGE-FROM-OPS>                         20960761
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                     (9603644)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        4632366
<NUMBER-OF-SHARES-REDEEMED>                  (5182228)
<SHARES-REINVESTED>                            1017100
<NET-CHANGE-IN-ASSETS>                         8587016
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     13967507
<OVERDISTRIB-NII-PRIOR>                         (5658)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           868526
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2211270
<AVERAGE-NET-ASSETS>                         115491413
<PER-SHARE-NAV-BEGIN>                             8.93
<PER-SHARE-NII>                                 (0.16)
<PER-SHARE-GAIN-APPREC>                           1.75
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.25)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.27
<EXPENSE-RATIO>                                   2.20
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 043
   <NAME> MFS OTC FUND C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             OCT-01-1996
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                        109623378
<INVESTMENTS-AT-VALUE>                       121222974
<RECEIVABLES>                                   969150
<ASSETS-OTHER>                                    1062
<OTHER-ITEMS-ASSETS>                           1465766
<TOTAL-ASSETS>                               123658952
<PAYABLE-FOR-SECURITIES>                        436368
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       364824
<TOTAL-LIABILITIES>                             801192
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     111850491
<SHARES-COMMON-STOCK>                           630395
<SHARES-COMMON-PRIOR>                           775010
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (9435)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (582892)
<ACCUM-APPREC-OR-DEPREC>                      11599596
<NET-ASSETS>                                 122857760
<DIVIDEND-INCOME>                               175657
<INTEREST-INCOME>                               195845
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2211199)
<NET-INVESTMENT-INCOME>                      (1839697)
<REALIZED-GAINS-CURRENT>                       2976813
<APPREC-INCREASE-CURRENT>                     19823645
<NET-CHANGE-FROM-OPS>                         20960761
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                      (727466)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         555743
<NUMBER-OF-SHARES-REDEEMED>                   (782083)
<SHARES-REINVESTED>                              81725
<NET-CHANGE-IN-ASSETS>                         8587016
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     13967507
<OVERDISTRIB-NII-PRIOR>                         (5658)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           868526
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2211270
<AVERAGE-NET-ASSETS>                         115491413
<PER-SHARE-NAV-BEGIN>                             8.85
<PER-SHARE-NII>                                 (0.16)
<PER-SHARE-GAIN-APPREC>                           1.74
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.24)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.19
<EXPENSE-RATIO>                                   2.16
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 044
   <NAME> MFS OTC FUND I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             JAN-03-1997
<PERIOD-END>                               SEP-30-1997
<INVESTMENTS-AT-COST>                        109623378
<INVESTMENTS-AT-VALUE>                       121222974
<RECEIVABLES>                                   969150
<ASSETS-OTHER>                                    1062
<OTHER-ITEMS-ASSETS>                           1465766
<TOTAL-ASSETS>                               123658952
<PAYABLE-FOR-SECURITIES>                        436368
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       364824
<TOTAL-LIABILITIES>                             801192
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     111850491
<SHARES-COMMON-STOCK>                           146676
<SHARES-COMMON-PRIOR>                                0
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (9435)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (582892)
<ACCUM-APPREC-OR-DEPREC>                      11599596
<NET-ASSETS>                                 122857760
<DIVIDEND-INCOME>                               175657
<INTEREST-INCOME>                               195845
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (2211199)
<NET-INVESTMENT-INCOME>                      (1839697)
<REALIZED-GAINS-CURRENT>                       2976813
<APPREC-INCREASE-CURRENT>                     19823645
<NET-CHANGE-FROM-OPS>                         20960761
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         277881
<NUMBER-OF-SHARES-REDEEMED>                   (131205)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         8587016
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     13967507
<OVERDISTRIB-NII-PRIOR>                         (5658)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           868526
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                2211270
<AVERAGE-NET-ASSETS>                         115491413
<PER-SHARE-NAV-BEGIN>                             8.50
<PER-SHARE-NII>                                 (0.05)
<PER-SHARE-GAIN-APPREC>                           0.99
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.44
<EXPENSE-RATIO>                                   1.03
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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