<PAGE> PAGE 1
000 A000000 02/28/97
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 MORGAN J.P. SECURITIES INC
020 B000001 13-3224016
020 C000001 18
020 A000002 WEEDEN & CO.
020 B000002 13-3364318
020 C000002 17
020 A000003 INSTINET CORP.
020 B000003 13-3443395
020 C000003 17
020 A000004 MERRILL LYNCH
020 B000004 13-5674085
020 C000004 14
020 A000005 DONALDSON LUFTKIN JENNRETTE
020 B000005 13-2741729
020 C000005 13
020 A000006 CS FIRST BOSTON CORP.
020 B000006 13-5659485
020 C000006 11
020 A000007 BERNSTEIN
020 B000007 13-2625874
020 C000007 11
020 A000008 GOLDMAN SACHS
020 B000008 13-5108880
020 C000008 10
020 A000009 DEAN WITTER
020 B000009 00-0000000
020 C000009 8
020 A000010 PAINE WEBBER
020 B000010 13-2638166
020 C000010 7
021 000000 211
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001 12678530
022 D000001 81085
022 A000002 PAINE WEBBER INC
022 B000002 13-2638166
022 C000002 535911
022 D000002 507791
<PAGE> PAGE 4
022 A000003 LEHMAN BROTHERS
022 B000003 13-2518466
022 C000003 468261
022 D000003 123467
022 A000004 SMITH BARNEY
022 B000004 13-1912900
022 C000004 294321
022 D000004 287337
022 A000005 MERRILL LYNCH
022 B000005 13-5674085
022 C000005 444591
022 D000005 98963
022 A000006 MORGAN J.P. SECURITIES
022 B000006 13-3224016
022 C000006 227625
022 D000006 165627
022 A000007 BANK OF AMERICA
022 B000007 00-0000000
022 C000007 335937
022 D000007 0
022 A000008 DILLON, READ & CO.
022 B000008 13-1939216
022 C000008 161596
022 D000008 157850
022 A000009 CS FIRST BOSTON
022 B000009 13-5659485
022 C000009 248843
022 D000009 8389
022 A000010 FORD MOTOR CREDIT
022 B000010 38-1612444
022 C000010 210326
022 D000010 0
023 C000000 17493115
023 D000000 2302232
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 D000000 Y
077 I000000 Y
077 Q010000 Y
078 000000 N
080 C00AA00 0
081 B00AA00 0
082 B00AA00 0
083 B00AA00 0
084 B00AA00 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
015 A000101 STATE STREET BANK & TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
<PAGE> PAGE 6
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 184840
025 A000102 BANK OF AMERICA
025 C000102 D
025 D000102 21930
025 A000103 MERRILL LYNCH & CO.
025 B000103 135674085
025 C000103 D
025 D000103 20792
025 D000104 0
025 D000105 0
025 D000106 0
025 D000107 0
025 D000108 0
028 A010100 511181
028 A020100 1655
028 A030100 0
028 A040100 598932
028 B010100 759925
028 B020100 1824
028 B030100 0
028 B040100 830173
028 C010100 485680
028 C020100 1466
028 C030100 0
028 C040100 542633
028 D010100 943628
028 D020100 1717
028 D030100 0
028 D040100 734863
028 E010100 791244
028 E020100 1670
028 E030100 0
028 E040100 949604
028 F010100 807216
028 F020100 1568
028 F030100 0
028 F040100 643760
028 G010100 4298875
028 G020100 9900
028 G030100 0
<PAGE> PAGE 7
028 G040100 4299964
028 H000100 0
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
048 B020100 0.450
048 C010100 300000
048 C020100 0.400
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
<PAGE> PAGE 8
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 Y
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 33.5
062 D000100 25.3
062 E000100 0.0
062 F000100 0.0
062 G000100 0.0
062 H000100 0.0
062 I000100 45.5
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
063 A000100 41
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
<PAGE> PAGE 9
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 0
071 B000100 0
071 C000100 0
071 D000100 0
072 A000100 6
072 B000100 15298
072 C000100 0
072 D000100 0
072 E000100 0
072 F000100 1349
072 G000100 0
072 H000100 0
072 I000100 400
072 J000100 116
072 K000100 70
072 L000100 49
072 M000100 17
072 N000100 0
072 O000100 0
072 P000100 0
<PAGE> PAGE 10
072 Q000100 0
072 R000100 7
072 S000100 2
072 T000100 0
072 U000100 0
072 V000100 0
072 W000100 225
072 X000100 2235
072 Y000100 99
072 Z000100 13163
072AA000100 0
072BB000100 0
072CC010100 0
072CC020100 0
072DD010100 13163
072DD020100 0
072EE000100 0
073 A010100 0.0200
073 A020100 0.0000
073 B000100 0.0000
073 C000100 0.0000
074 A000100 594
074 B000100 165000
074 C000100 516152
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 15684
074 M000100 5
074 N000100 697435
074 O000100 0
074 P000100 11
074 Q000100 0
074 R010100 0
074 R020100 0
074 R030100 0
074 R040100 44408
074 S000100 0
074 T000100 653016
074 U010100 653016
074 U020100 0
074 V010100 1.00
074 V020100 0.00
074 W000100 0.9999
074 X000100 46330
074 Y000100 0
<PAGE> PAGE 11
075 A000100 568970
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 1400
025 D000202 0
025 D000203 0
025 D000204 0
025 D000205 0
025 D000206 0
025 D000207 0
025 D000208 0
028 A010200 22513
028 A020200 117
028 A030200 0
028 A040200 24064
028 B010200 3894
028 B020200 127
028 B030200 0
028 B040200 8279
028 C010200 2707
028 C020200 122
028 C030200 0
028 C040200 3563
028 D010200 3256
028 D020200 135
028 D030200 0
028 D040200 2847
028 E010200 2631
028 E020200 135
028 E030200 0
028 E040200 2585
028 F010200 2950
028 F020200 121
028 F030200 0
028 F040200 2687
<PAGE> PAGE 12
028 G010200 37949
028 G020200 756
028 G030200 0
028 G040200 44025
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
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 0.000
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
<PAGE> PAGE 13
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 Y
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 1.3
062 C000200 94.8
062 D000200 3.8
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 0.0
062 M000200 0.0
062 N000200 0.0
062 O000200 0.0
062 P000200 0.0
062 Q000200 0.0
062 R000200 0.0
063 A000200 43
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
<PAGE> PAGE 14
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 0
071 B000200 0
071 C000200 0
071 D000200 0
072 A000200 6
072 B000200 974
072 C000200 0
072 D000200 0
072 E000200 0
072 F000200 91
072 G000200 0
072 H000200 0
072 I000200 26
072 J000200 8
072 K000200 3
072 L000200 2
072 M000200 4
<PAGE> PAGE 15
072 N000200 8
072 O000200 0
072 P000200 0
072 Q000200 0
072 R000200 5
072 S000200 0
072 T000200 0
072 U000200 0
072 V000200 0
072 W000200 6
072 X000200 153
072 Y000200 6
072 Z000200 828
072AA000200 0
072BB000200 0
072CC010200 0
072CC020200 0
072DD010200 828
072DD020200 0
072EE000200 0
073 A010200 0.0200
073 A020200 0.0000
073 B000200 0.0000
073 C000200 0.0000
074 A000200 92
074 B000200 1400
074 C000200 35753
074 D000200 0
074 E000200 0
074 F000200 0
074 G000200 0
074 H000200 0
074 I000200 0
074 J000200 0
074 K000200 0
074 L000200 12
074 M000200 1
074 N000200 37258
074 O000200 0
074 P000200 1
074 Q000200 0
074 R010200 0
074 R020200 0
074 R030200 0
074 R040200 77
074 S000200 0
074 T000200 37180
074 U010200 37180
074 U020200 0
074 V010200 1.00
074 V020200 0.00
<PAGE> PAGE 16
074 W000200 0.9999
074 X000200 2217
074 Y000200 0
075 A000200 36725
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
015 E010305 X
024 000300 N
028 A010300 250588
028 A020300 9909
028 A030300 0
028 A040300 224176
028 B010300 274581
028 B020300 4817
028 B030300 0
028 B040300 225672
028 C010300 87837
028 C020300 5031
028 C030300 0
028 C040300 100635
028 D010300 221600
028 D020300 4612
<PAGE> PAGE 17
028 D030300 0
028 D040300 372415
028 E010300 326694
028 E020300 4509
028 E030300 0
028 E040300 247532
028 F010300 97598
028 F020300 4428
028 F030300 0
028 F040300 241701
028 G010300 1258898
028 G020300 33306
028 G030300 0
028 G040300 1412132
028 H000300 1243477
029 000300 Y
030 A000300 708
030 B000300 4.75
030 C000300 0.00
031 A000300 90
031 B000300 0
032 000300 618
033 000300 0
034 000300 Y
035 000300 113
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
042 D000300 9
042 E000300 0
042 F000300 0
042 G000300 0
042 H000300 0
043 000300 303
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
<PAGE> PAGE 18
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 Y
055 B000300 Y
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
062 C000300 0.0
062 D000300 0.0
062 E000300 5.2
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 94.0
062 P000300 0.0
062 Q000300 0.0
062 R000300 0.0
<PAGE> PAGE 19
063 A000300 0
063 B000300 14.4
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 N
070 F010300 N
070 F020300 N
070 G010300 Y
070 G020300 Y
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
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 745966
071 B000300 962684
071 C000300 1795197
071 D000300 42
072 A000300 6
072 B000300 56242
<PAGE> PAGE 20
072 C000300 0
072 D000300 0
072 E000300 0
072 F000300 3785
072 G000300 1
072 H000300 0
072 I000300 1149
072 J000300 241
072 K000300 19
072 L000300 47
072 M000300 42
072 N000300 0
072 O000300 0
072 P000300 0
072 Q000300 0
072 R000300 26
072 S000300 3
072 T000300 301
072 U000300 0
072 V000300 0
072 W000300 285
072 X000300 5899
072 Y000300 166
072 Z000300 50510
072AA000300 4902
072BB000300 0
072CC010300 19119
072CC020300 0
072DD010300 48665
072DD020300 1637
072EE000300 0
073 A010300 0.2900
073 A020300 0.2400
073 B000300 0.0000
073 C000300 0.0000
074 A000300 30
074 B000300 0
074 C000300 91410
074 D000300 1666779
074 E000300 0
074 F000300 0
074 G000300 0
074 H000300 0
074 I000300 0
074 J000300 31012
074 K000300 0
074 L000300 25565
074 M000300 22
074 N000300 1814818
074 O000300 36448
074 P000300 29
<PAGE> PAGE 21
074 Q000300 0
074 R010300 0
074 R020300 0
074 R030300 0
074 R040300 5562
074 S000300 0
074 T000300 1772779
074 U010300 156220
074 U020300 6746
074 V010300 10.88
074 V020300 10.87
074 W000300 0.0000
074 X000300 44197
074 Y000300 1540
075 A000300 0
075 B000300 1892595
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 4504
028 A020400 0
028 A030400 0
028 A040400 2285
028 B010400 5200
028 B020400 0
028 B030400 0
028 B040400 6180
028 C010400 5531
028 C020400 0
028 C030400 0
028 C040400 5175
028 D010400 13042
028 D020400 0
028 D030400 0
028 D040400 10913
028 E010400 11118
028 E020400 21
028 E030400 0
028 E040400 12475
028 F010400 4482
<PAGE> PAGE 22
028 F020400 0
028 F030400 0
028 F040400 10368
028 G010400 43877
028 G020400 21
028 G030400 0
028 G040400 47395
028 H000400 15170
029 000400 Y
030 A000400 86
030 B000400 5.75
030 C000400 0.00
031 A000400 13
031 B000400 0
032 000400 73
033 000400 0
034 000400 Y
035 000400 66
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 442
044 000400 0
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
<PAGE> PAGE 23
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
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
<PAGE> PAGE 24
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
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 N
070 R020400 N
071 A000400 112264
071 B000400 117128
071 C000400 115700
071 D000400 97
072 A000400 6
072 B000400 53
072 C000400 93
072 D000400 0
072 E000400 0
<PAGE> PAGE 25
072 F000400 446
072 G000400 0
072 H000400 0
072 I000400 102
072 J000400 13
072 K000400 22
072 L000400 53
072 M000400 7
072 N000400 0
072 O000400 0
072 P000400 0
072 Q000400 0
072 R000400 24
072 S000400 2
072 T000400 441
072 U000400 0
072 V000400 0
072 W000400 78
072 X000400 1188
072 Y000400 3
072 Z000400 -1040
072AA000400 837
072BB000400 0
072CC010400 4466
072CC020400 0
072DD010400 0
072DD020400 0
072EE000400 15678
073 A010400 0.0000
073 A020400 0.0000
073 B000400 1.2500
073 C000400 0.0000
074 A000400 4
074 B000400 0
074 C000400 1869
074 D000400 0
074 E000400 0
074 F000400 109218
074 G000400 0
074 H000400 0
074 I000400 0
074 J000400 13341
074 K000400 0
074 L000400 73
074 M000400 1
074 N000400 124506
074 O000400 15667
074 P000400 4
074 Q000400 0
074 R010400 0
074 R020400 0
<PAGE> PAGE 26
074 R030400 0
074 R040400 653
074 S000400 0
074 T000400 108182
074 U010400 4266
074 U020400 8265
074 V010400 8.15
074 V020400 8.05
074 W000400 0.0000
074 X000400 11895
074 Y000400 0
075 A000400 0
075 B000400 119364
076 000400 0.00
SIGNATURE JAMES O. YOST
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> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 1626766884
<INVESTMENTS-AT-VALUE> 1758188772
<RECEIVABLES> 56577010
<ASSETS-OTHER> 22187
<OTHER-ITEMS-ASSETS> 29852
<TOTAL-ASSETS> 1814817821
<PAYABLE-FOR-SECURITIES> 36447728
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5590770
<TOTAL-LIABILITIES> 42038498
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1638757854
<SHARES-COMMON-STOCK> 156220194
<SHARES-COMMON-PRIOR> 167203931
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1008275)
<ACCUMULATED-NET-GAINS> 3261270
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 131768474
<NET-ASSETS> 1772779323
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 56242366
<OTHER-INCOME> 0
<EXPENSES-NET> (5732295)
<NET-INVESTMENT-INCOME> 50510070
<REALIZED-GAINS-CURRENT> 4901667
<APPREC-INCREASE-CURRENT> 19118737
<NET-CHANGE-FROM-OPS> 74530475
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (48664857)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 114729890
<NUMBER-OF-SHARES-REDEEMED> (128686431)
<SHARES-REINVESTED> 2972804
<NET-CHANGE-IN-ASSETS> (95811458)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> (1216893)
<OVERDIST-NET-GAINS-PRIOR> (1640397)
<GROSS-ADVISORY-FEES> 3784795
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (5898666)
<AVERAGE-NET-ASSETS> 1892595364
<PER-SHARE-NAV-BEGIN> 10.75
<PER-SHARE-NII> 0.29
<PER-SHARE-GAIN-APPREC> 0.13
<PER-SHARE-DIVIDEND> (0.29)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.88
<EXPENSE-RATIO> 0.57
<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> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 1626766884
<INVESTMENTS-AT-VALUE> 1758188772
<RECEIVABLES> 56577010
<ASSETS-OTHER> 22187
<OTHER-ITEMS-ASSETS> 29852
<TOTAL-ASSETS> 1814817821
<PAYABLE-FOR-SECURITIES> 36447728
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 5590770
<TOTAL-LIABILITIES> 42038498
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 1638757854
<SHARES-COMMON-STOCK> 6745653
<SHARES-COMMON-PRIOR> 6599993
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> (1008275)
<ACCUMULATED-NET-GAINS> 3261270
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 131768474
<NET-ASSETS> 1772779323
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 56242366
<OTHER-INCOME> 0
<EXPENSES-NET> (5732295)
<NET-INVESTMENT-INCOME> 50510070
<REALIZED-GAINS-CURRENT> 4901667
<APPREC-INCREASE-CURRENT> 19118737
<NET-CHANGE-FROM-OPS> 74530475
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (1636596)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1415235
<NUMBER-OF-SHARES-REDEEMED> (1359841)
<SHARES-REINVESTED> 90266
<NET-CHANGE-IN-ASSETS> (95811458)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> (1216893)
<OVERDIST-NET-GAINS-PRIOR> (1640397)
<GROSS-ADVISORY-FEES> 3784795
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (5898666)
<AVERAGE-NET-ASSETS> 1892595364
<PER-SHARE-NAV-BEGIN> 10.74
<PER-SHARE-NII> 0.24
<PER-SHARE-GAIN-APPREC> 0.13
<PER-SHARE-DIVIDEND> (0.24)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 10.87
<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> 021
<NAME> MFS GOVERNMENT MONEY MARKET
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 37153266
<INVESTMENTS-AT-VALUE> 37153266
<RECEIVABLES> 11557
<ASSETS-OTHER> 603
<OTHER-ITEMS-ASSETS> 92098
<TOTAL-ASSETS> 37257524
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 77857
<TOTAL-LIABILITIES> 77857
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 37179667
<SHARES-COMMON-STOCK> 37179667
<SHARES-COMMON-PRIOR> 42499447
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 37179667
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 974317
<OTHER-INCOME> 0
<EXPENSES-NET> (146689)
<NET-INVESTMENT-INCOME> 827628
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 827628
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (827628)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 37949277
<NUMBER-OF-SHARES-REDEEMED> (44025253)
<SHARES-REINVESTED> 756196
<NET-CHANGE-IN-ASSETS> (5319780)
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 91332
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (152519)
<AVERAGE-NET-ASSETS> 36724625
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.83
<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 MONEY MARKET FUND
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 681152330
<INVESTMENTS-AT-VALUE> 681152330
<RECEIVABLES> 15684390
<ASSETS-OTHER> 4757
<OTHER-ITEMS-ASSETS> 593901
<TOTAL-ASSETS> 697435378
<PAYABLE-FOR-SECURITIES> 0
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 44419575
<TOTAL-LIABILITIES> 44419575
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 653015803
<SHARES-COMMON-STOCK> 653015803
<SHARES-COMMON-PRIOR> 644204922
<ACCUMULATED-NII-CURRENT> 0
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> 0
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> 0
<NET-ASSETS> 653015803
<DIVIDEND-INCOME> 0
<INTEREST-INCOME> 15297994
<OTHER-INCOME> 0
<EXPENSES-NET> (2135099)
<NET-INVESTMENT-INCOME> 13162895
<REALIZED-GAINS-CURRENT> 0
<APPREC-INCREASE-CURRENT> 0
<NET-CHANGE-FROM-OPS> 13162895
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> (13162895)
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 4298874939
<NUMBER-OF-SHARES-REDEEMED> (4299964304)
<SHARES-REINVESTED> 9900246
<NET-CHANGE-IN-ASSETS> 8810881
<ACCUMULATED-NII-PRIOR> 0
<ACCUMULATED-GAINS-PRIOR> 0
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 1348860
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (2233664)
<AVERAGE-NET-ASSETS> 568970307
<PER-SHARE-NAV-BEGIN> 1.00
<PER-SHARE-NII> 0.02
<PER-SHARE-GAIN-APPREC> 0.00
<PER-SHARE-DIVIDEND> (0.02)
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 1.00
<EXPENSE-RATIO> 0.78
<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 CLASS A
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 114844444
<INVESTMENTS-AT-VALUE> 111086675
<RECEIVABLES> 13415119
<ASSETS-OTHER> 969
<OTHER-ITEMS-ASSETS> 3701
<TOTAL-ASSETS> 124506464
<PAYABLE-FOR-SECURITIES> 15666635
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 657406
<TOTAL-LIABILITIES> 16324041
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 113858891
<SHARES-COMMON-STOCK> 4265751
<SHARES-COMMON-PRIOR> 3875873
<ACCUMULATED-NII-CURRENT> (1045571)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (873128)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3757769)
<NET-ASSETS> 108182423
<DIVIDEND-INCOME> 92512
<INTEREST-INCOME> 52557
<OTHER-INCOME> 0
<EXPENSES-NET> (1184982)
<NET-INVESTMENT-INCOME> (1039913)
<REALIZED-GAINS-CURRENT> 836900
<APPREC-INCREASE-CURRENT> 4466280
<NET-CHANGE-FROM-OPS> 4263267
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (5358560)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 1647550
<NUMBER-OF-SHARES-REDEEMED> (1846541)
<SHARES-REINVESTED> 588869
<NET-CHANGE-IN-ASSETS> (818852)
<ACCUMULATED-NII-PRIOR> (5658)
<ACCUMULATED-GAINS-PRIOR> 13967507
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 445574
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1187982)
<AVERAGE-NET-ASSETS> 119363778
<PER-SHARE-NAV-BEGIN> 9.06
<PER-SHARE-NII> (0.06)
<PER-SHARE-GAIN-APPREC> 0.47
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.32)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.15
<EXPENSE-RATIO> 1.49
<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 CLASS B
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 114844444
<INVESTMENTS-AT-VALUE> 111086675
<RECEIVABLES> 13415119
<ASSETS-OTHER> 969
<OTHER-ITEMS-ASSETS> 3701
<TOTAL-ASSETS> 124506464
<PAYABLE-FOR-SECURITIES> 15666635
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 657406
<TOTAL-LIABILITIES> 16324041
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 113858891
<SHARES-COMMON-STOCK> 8265268
<SHARES-COMMON-PRIOR> 7505225
<ACCUMULATED-NII-CURRENT> (1045571)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (873128)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3757769)
<NET-ASSETS> 108182423
<DIVIDEND-INCOME> 92512
<INTEREST-INCOME> 52557
<OTHER-INCOME> 0
<EXPENSES-NET> (1184982)
<NET-INVESTMENT-INCOME> (1039913)
<REALIZED-GAINS-CURRENT> 836900
<APPREC-INCREASE-CURRENT> 4466280
<NET-CHANGE-FROM-OPS> 4263267
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (9591510)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 2548951
<NUMBER-OF-SHARES-REDEEMED> (2805832)
<SHARES-REINVESTED> 1016924
<NET-CHANGE-IN-ASSETS> (818852)
<ACCUMULATED-NII-PRIOR> (5658)
<ACCUMULATED-GAINS-PRIOR> 13967507
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 445574
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1187982)
<AVERAGE-NET-ASSETS> 119363778
<PER-SHARE-NAV-BEGIN> 8.93
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 0.46
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.25)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.05
<EXPENSE-RATIO> 2.30
<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 CLASS C
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 114844444
<INVESTMENTS-AT-VALUE> 111086675
<RECEIVABLES> 13415119
<ASSETS-OTHER> 969
<OTHER-ITEMS-ASSETS> 3701
<TOTAL-ASSETS> 124506464
<PAYABLE-FOR-SECURITIES> 15666635
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 657406
<TOTAL-LIABILITIES> 16324041
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 113858891
<SHARES-COMMON-STOCK> 673385
<SHARES-COMMON-PRIOR> 775010
<ACCUMULATED-NII-CURRENT> (1045571)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (873128)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3757769)
<NET-ASSETS> 108182423
<DIVIDEND-INCOME> 92512
<INTEREST-INCOME> 52557
<OTHER-INCOME> 0
<EXPENSES-NET> (1184982)
<NET-INVESTMENT-INCOME> (1039913)
<REALIZED-GAINS-CURRENT> 836900
<APPREC-INCREASE-CURRENT> 4466280
<NET-CHANGE-FROM-OPS> 4263267
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> (727465)
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 374992
<NUMBER-OF-SHARES-REDEEMED> (558265)
<SHARES-REINVESTED> 81648
<NET-CHANGE-IN-ASSETS> (818852)
<ACCUMULATED-NII-PRIOR> (5658)
<ACCUMULATED-GAINS-PRIOR> 13967507
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 445574
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1187982)
<AVERAGE-NET-ASSETS> 119363778
<PER-SHARE-NAV-BEGIN> 8.85
<PER-SHARE-NII> (0.09)
<PER-SHARE-GAIN-APPREC> 0.46
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> (1.24)
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 7.98
<EXPENSE-RATIO> 2.24
<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 CLASS I
<MULTIPLIER> 1
<S> <C>
<PERIOD-TYPE> 6-MOS
<FISCAL-YEAR-END> AUG-31-1997
<PERIOD-START> SEP-01-1996
<PERIOD-END> FEB-28-1997
<INVESTMENTS-AT-COST> 114844444
<INVESTMENTS-AT-VALUE> 111086675
<RECEIVABLES> 13415119
<ASSETS-OTHER> 969
<OTHER-ITEMS-ASSETS> 3701
<TOTAL-ASSETS> 124506464
<PAYABLE-FOR-SECURITIES> 15666635
<SENIOR-LONG-TERM-DEBT> 0
<OTHER-ITEMS-LIABILITIES> 657406
<TOTAL-LIABILITIES> 16324041
<SENIOR-EQUITY> 0
<PAID-IN-CAPITAL-COMMON> 113858891
<SHARES-COMMON-STOCK> 183235
<SHARES-COMMON-PRIOR> 0
<ACCUMULATED-NII-CURRENT> (1045571)
<OVERDISTRIBUTION-NII> 0
<ACCUMULATED-NET-GAINS> (873128)
<OVERDISTRIBUTION-GAINS> 0
<ACCUM-APPREC-OR-DEPREC> (3757769)
<NET-ASSETS> 108182423
<DIVIDEND-INCOME> 92512
<INTEREST-INCOME> 52557
<OTHER-INCOME> 0
<EXPENSES-NET> (1184982)
<NET-INVESTMENT-INCOME> (1039913)
<REALIZED-GAINS-CURRENT> 836900
<APPREC-INCREASE-CURRENT> 4466280
<NET-CHANGE-FROM-OPS> 4263267
<EQUALIZATION> 0
<DISTRIBUTIONS-OF-INCOME> 0
<DISTRIBUTIONS-OF-GAINS> 0
<DISTRIBUTIONS-OTHER> 0
<NUMBER-OF-SHARES-SOLD> 265876
<NUMBER-OF-SHARES-REDEEMED> (82641)
<SHARES-REINVESTED> 0
<NET-CHANGE-IN-ASSETS> (818852)
<ACCUMULATED-NII-PRIOR> (5658)
<ACCUMULATED-GAINS-PRIOR> 13967507
<OVERDISTRIB-NII-PRIOR> 0
<OVERDIST-NET-GAINS-PRIOR> 0
<GROSS-ADVISORY-FEES> 445574
<INTEREST-EXPENSE> 0
<GROSS-EXPENSE> (1187982)
<AVERAGE-NET-ASSETS> 119363778
<PER-SHARE-NAV-BEGIN> 8.63
<PER-SHARE-NII> (0.01)
<PER-SHARE-GAIN-APPREC> (0.47)
<PER-SHARE-DIVIDEND> 0
<PER-SHARE-DISTRIBUTIONS> 0
<RETURNS-OF-CAPITAL> 0
<PER-SHARE-NAV-END> 8.15
<EXPENSE-RATIO> 1.35
<AVG-DEBT-OUTSTANDING> 0
<AVG-DEBT-PER-SHARE> 0
</TABLE>
