MFS SERIES TRUST IV
NSAR-A, 2000-04-26
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<PAGE>      PAGE  1
000 A000000 02/29/2000
000 C000000 0000063068
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
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 MID CAP GROWTH 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
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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
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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
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES CO.
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 MFS FUND DISTRIBUTORS, INC.
<PAGE>      PAGE  3
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
012 A00AA01 MFS SERVICE CENTER, INC.
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 02116
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   57
019 C00AA00 MASSFINSER
020 A000001 SALOMON SMITH BARNEY INC.
020 B000001 13-3082694
020 C000001     89
020 A000002 MERRILL LYNCH
020 B000002 13-5674085
020 C000002     69
020 A000003 DONALDSON LUFKIN & JENRETTE
020 B000003 13-2741729
020 C000003     57
020 A000004 MORGAN STANLEY & CO.
020 B000004 13-2655998
020 C000004     37
020 A000005 LEHMAN BROS. INC.
020 B000005 13-2518466
020 C000005     32
020 A000006 BANC AMERICA SECURITIES
020 B000006 94-1687665
020 C000006     30
020 A000007 DB CLEARING SERVICES
020 B000007 00-0000000
020 C000007     28
020 A000008 JEFFRIES & CO.
020 B000008 00-0000000
020 C000008     24
020 A000009 RAYMOND JAMES & ASSOC.
020 B000009 00-0000000
020 C000009     24
020 A000010 PAINE WEBBER INC.
020 B000010 13-2638166
020 C000010     22
021  000000      638
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001  18182274
<PAGE>      PAGE  4
022 D000001      1726
022 A000002 ASSOC. CORP N.A.
022 B000002 00-0000000
022 C000002   4592994
022 D000002         0
022 A000003 SHEARSON LEHMAN BROTHERS INC.
022 B000003 00-0000000
022 C000003   3966063
022 D000003         0
022 A000004 CITIGROUP HOLDINGS INC.
022 B000004 13-3214963
022 C000004   3426123
022 D000004         0
022 A000005 BANK OF AMERICA
022 B000005 94-1687665
022 C000005   3037452
022 D000005       998
022 A000006 CHASE SECURITIES
022 B000006 13-3112953
022 C000006   2146182
022 D000006         0
022 A000007 SALOMON SMITH BARNEY
022 B000007 13-3082694
022 C000007   1917277
022 D000007     69061
022 A000008 MORGAN STANLEY & CO.
022 B000008 13-2655998
022 C000008   1710460
022 D000008     20576
022 A000009 CS FIRST BOSTON
022 B000009 13-5659485
022 C000009   1523325
022 D000009     57021
022 A000010 BANC ONE CAPITAL MARKETS
022 B000010 00-0000000
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<PAGE>      PAGE  5
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054 I00AA00 N
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<PAGE>      PAGE  6
086 C010000      0
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015 A000101 STATE STREET BANK & TRUST COMPANY
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025 A000105 JP MORGAN & CO
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<PAGE>      PAGE  7
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040  000100 N
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
062 G000100   0.0
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062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
063 A000100  28
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
<PAGE>      PAGE  10
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 N
070 R020100 N
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<PAGE>      PAGE  11
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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 & CO.
025 B000201 13-5108880
025 C000201 D
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<PAGE>      PAGE  12
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039  000200 N
040  000200 N
041  000200 N
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042 B000200   0
042 C000200   0
042 D000200   0
<PAGE>      PAGE  13
042 E000200   0
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050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
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055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
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<PAGE>      PAGE  14
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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
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<PAGE>      PAGE  15
070 N020200 N
070 O010200 Y
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<PAGE>      PAGE  16
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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 CHASE MANHATTAN BANK
015 B000303 S
015 C010303 NEW YORK
015 C020303 NY
015 C030303 10286
015 E010303 X
024  000300 N
<PAGE>      PAGE  17
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<PAGE>      PAGE  18
039  000300 N
040  000300 Y
041  000300 Y
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<PAGE>      PAGE  19
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062 C000300   0.0
062 D000300   0.0
062 E000300   0.5
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  97.7
062 P000300   0.0
062 Q000300   0.0
062 R000300   0.0
063 A000300   0
063 B000300 14.7
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 N
<PAGE>      PAGE  20
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    166327
071 B000300    256690
071 C000300   1356833
071 D000300   12
072 A000300  6
072 B000300    40835
072 C000300        0
072 D000300        0
072 E000300        0
072 F000300     2792
072 G000300       71
072 H000300        0
072 I000300      687
072 J000300      173
072 K000300       36
072 L000300       24
072 M000300       41
072 N000300        0
072 O000300        0
072 P000300        0
072 Q000300        0
072 R000300       18
072 S000300        2
072 T000300      291
072 U000300        0
072 V000300        0
072 W000300      114
072 X000300     4249
072 Y000300      159
072 Z000300    36745
072AA000300        0
072BB000300     6658
072CC010300        0
072CC020300    36724
072DD010300    34923
<PAGE>      PAGE  21
072DD020300     1682
072EE000300    21690
073 A010300   0.2700
073 A020300   0.2300
073 B000300   0.1600
073 C000300   0.0000
074 A000300       70
074 B000300        0
074 C000300     7360
074 D000300  1302099
074 E000300        0
074 F000300        0
074 G000300        0
074 H000300        0
074 I000300        0
074 J000300    17662
074 K000300        0
074 L000300    21440
074 M000300       22
074 N000300  1348653
074 O000300    11064
074 P000300       25
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300     4223
074 S000300        0
074 T000300  1333341
074 U010300   127727
074 U020300     7249
074 V010300     9.88
074 V020300     9.87
074 W000300   0.0000
074 X000300    32515
074 Y000300      305
075 A000300        0
075 B000300  1390414
076  000300     0.00
015 A000401 STATE STREET BANK & TRUST COMPANY
015 B000401 C
015 C010401 BOSTON
015 C020401 MA
015 C030401 02110
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
<PAGE>      PAGE  22
024  000400 Y
025 A000401 AG EDWARDS
025 B000401 43-0895447
025 C000401 D
025 D000401   14323
025 D000402       0
025 D000403       0
025 D000404       0
025 D000405       0
025 D000406       0
025 D000407       0
025 D000408       0
028 A010400     43078
028 A020400         0
028 A030400         0
028 A040400     36468
028 B010400     38423
028 B020400         0
028 B030400         0
028 B040400     17054
028 C010400     64492
028 C020400         0
028 C030400         0
028 C040400     23879
028 D010400     73054
028 D020400     37746
028 D030400         0
028 D040400     19913
028 E010400     94430
028 E020400         6
028 E030400         0
028 E040400     29196
028 F010400     85832
028 F020400         1
028 F030400         0
028 F040400     33335
028 G010400    399309
028 G020400     37753
028 G030400         0
028 G040400    159845
028 H000400    161775
029  000400 Y
030 A000400   1225
030 B000400  5.75
030 C000400  0.00
031 A000400    182
031 B000400      0
032  000400   1043
033  000400      0
034  000400 Y
035  000400     77
<PAGE>      PAGE  23
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  50
042 D000400  50
042 E000400   0
042 F000400   0
042 G000400   0
042 H000400   0
043  000400   1426
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
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
<PAGE>      PAGE  24
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
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
<PAGE>      PAGE  25
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 Y
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 Y
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    443179
071 B000400    229070
071 C000400    350941
071 D000400   65
072 A000400  6
072 B000400      912
072 C000400      182
072 D000400        0
072 E000400      106
072 F000400     1400
072 G000400       20
072 H000400        0
072 I000400      186
072 J000400       68
072 K000400       20
072 L000400       28
072 M000400       12
072 N000400        0
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400       16
072 S000400        0
072 T000400     1323
072 U000400        0
072 V000400        0
072 W000400       96
<PAGE>      PAGE  26
072 X000400     3169
072 Y000400       12
072 Z000400    -1957
072AA000400    79248
072BB000400        0
072CC010400   103864
072CC020400        0
072DD010400        0
072DD020400        0
072EE000400    41350
073 A010400   0.0000
073 A020400   0.0000
073 B000400   1.6800
073 C000400   0.0000
074 A000400        1
074 B000400        0
074 C000400    16620
074 D000400        0
074 E000400        0
074 F000400   599608
074 G000400        0
074 H000400        0
074 I000400    97672
074 J000400    14982
074 K000400        0
074 L000400     8627
074 M000400        2
074 N000400   737512
074 O000400     6279
074 P000400       25
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400    99656
074 S000400        0
074 T000400   631552
074 U010400 14023160
074 U020400 19250825
074 V010400    16.63
074 V020400    16.63
074 W000400   0.0000
074 X000400    41714
074 Y000400        0
075 A000400        0
075 B000400   374614
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> 021
   <NAME> MFS GOVERNMENT MONEY MARKET FUND
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                  6-MOS
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<PERIOD-END>                               FEB-29-2000
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<INVESTMENTS-AT-VALUE>                        55889435
<RECEIVABLES>                                   106285
<ASSETS-OTHER>                                     520
<OTHER-ITEMS-ASSETS>                             70981
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<OTHER-ITEMS-LIABILITIES>                      2773130
<TOTAL-LIABILITIES>                            2773130
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      53294091
<SHARES-COMMON-STOCK>                         53294091
<SHARES-COMMON-PRIOR>                         57073785
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<DIVIDEND-INCOME>                                    0
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<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (231058)
<NET-INVESTMENT-INCOME>                        1289798
<REALIZED-GAINS-CURRENT>                             0
<APPREC-INCREASE-CURRENT>                            0
<NET-CHANGE-FROM-OPS>                          1289798
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (1289798)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       84632311
<NUMBER-OF-SHARES-REDEEMED>                 (89839360)
<SHARES-REINVESTED>                            1197355
<NET-CHANGE-IN-ASSETS>                       (3779694)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           137774
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 240157
<AVERAGE-NET-ASSETS>                          55733042
<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>                                   0.86



</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-31-2000
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                       1279313285
<INVESTMENTS-AT-VALUE>                      1279313285
<RECEIVABLES>                                 23106054
<ASSETS-OTHER>                                   24085
<OTHER-ITEMS-ASSETS>                              1933
<TOTAL-ASSETS>                              1302445357
<PAYABLE-FOR-SECURITIES>                             0
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                    347797579
<TOTAL-LIABILITIES>                          347797579
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     954647778
<SHARES-COMMON-STOCK>                        954647778
<SHARES-COMMON-PRIOR>                       1079969025
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
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<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                             0
<NET-ASSETS>                                 954647778
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             32950010
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (3723317)
<NET-INVESTMENT-INCOME>                       29226693
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (29226693)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                    19537809957
<NUMBER-OF-SHARES-REDEEMED>              (19684990587)
<SHARES-REINVESTED>                           21859383
<NET-CHANGE-IN-ASSETS>                     (125321247)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          2521400
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                3871151
<AVERAGE-NET-ASSETS>                        1180072234
<PER-SHARE-NAV-BEGIN>                             1.00
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                           0.00
<PER-SHARE-DIVIDEND>                            (0.03)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               1.00
<EXPENSE-RATIO>                                   0.66



</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 031
   <NAME> MFS MUNICIPAL BOND CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                       1307900918
<INVESTMENTS-AT-VALUE>                      1309459460
<RECEIVABLES>                                 39101149
<ASSETS-OTHER>                                   22007
<OTHER-ITEMS-ASSETS>                             70492
<TOTAL-ASSETS>                              1348653108
<PAYABLE-FOR-SECURITIES>                      11046075
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4266257
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1336031377
<SHARES-COMMON-STOCK>                        127726587
<SHARES-COMMON-PRIOR>                        133837084
<ACCUMULATED-NII-CURRENT>                      2958827
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (6865086)
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<NET-ASSETS>                                1333340776
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             40834970
<OTHER-INCOME>                                       0
<EXPENSES-NET>                               (4089939)
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<DISTRIBUTIONS-OF-INCOME>                   (34923432)
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<NUMBER-OF-SHARES-REDEEMED>                 (23260392)
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<NET-CHANGE-IN-ASSETS>                     (129628904)
<ACCUMULATED-NII-PRIOR>                        2819630
<ACCUMULATED-GAINS-PRIOR>                     21483019
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          2791617
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                4249351
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<PER-SHARE-NII>                                   0.27
<PER-SHARE-GAIN-APPREC>                         (0.31)
<PER-SHARE-DIVIDEND>                            (0.27)
<PER-SHARE-DISTRIBUTIONS>                       (0.16)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.88
<EXPENSE-RATIO>                                   0.57


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 032
   <NAME> MFS MUNICIPAL BOND CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                       1307900918
<INVESTMENTS-AT-VALUE>                      1309459460
<RECEIVABLES>                                 39101149
<ASSETS-OTHER>                                   22007
<OTHER-ITEMS-ASSETS>                             70492
<TOTAL-ASSETS>                              1348653108
<PAYABLE-FOR-SECURITIES>                      11046075
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4266257
<TOTAL-LIABILITIES>                           15312332
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                    1336031377
<SHARES-COMMON-STOCK>                          7249382
<SHARES-COMMON-PRIOR>                          7572731
<ACCUMULATED-NII-CURRENT>                      2958827
<OVERDISTRIBUTION-NII>                               0
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<OVERDISTRIBUTION-GAINS>                     (6865086)
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<NET-ASSETS>                                1333340776
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                             40834970
<OTHER-INCOME>                                       0
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<NET-INVESTMENT-INCOME>                       36745031
<REALIZED-GAINS-CURRENT>                     (6657653)
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<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (1682402)
<DISTRIBUTIONS-OF-GAINS>                     (1135974)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         830033
<NUMBER-OF-SHARES-REDEEMED>                  (1337647)
<SHARES-REINVESTED>                             184265
<NET-CHANGE-IN-ASSETS>                     (129628904)
<ACCUMULATED-NII-PRIOR>                        2819630
<ACCUMULATED-GAINS-PRIOR>                     21483019
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
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<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                4249351
<AVERAGE-NET-ASSETS>                        1390413679
<PER-SHARE-NAV-BEGIN>                            10.34
<PER-SHARE-NII>                                   0.23
<PER-SHARE-GAIN-APPREC>                         (0.31)
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<PER-SHARE-DISTRIBUTIONS>                       (0.16)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.87
<EXPENSE-RATIO>                                   1.36


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 041
   <NAME> MFS MID CAP GROWTH FUND - CLASS A
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                        499290854
<INVESTMENTS-AT-VALUE>                       616227551
<RECEIVABLES>                                 23609000
<ASSETS-OTHER>                                    1585
<OTHER-ITEMS-ASSETS>                          97673613
<TOTAL-ASSETS>                               737511749
<PAYABLE-FOR-SECURITIES>                       6279010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     99680398
<TOTAL-LIABILITIES>                          105959408
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     449067535
<SHARES-COMMON-STOCK>                         14023160
<SHARES-COMMON-PRIOR>                          7337180
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (1980105)
<ACCUMULATED-NET-GAINS>                       67528215
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     116936696
<NET-ASSETS>                                 631552341
<DIVIDEND-INCOME>                               182108
<INTEREST-INCOME>                               911420
<OTHER-INCOME>                                  106040
<EXPENSES-NET>                               (3156973)
<NET-INVESTMENT-INCOME>                      (1957405)
<REALIZED-GAINS-CURRENT>                      79247882
<APPREC-INCREASE-CURRENT>                    103863794
<NET-CHANGE-FROM-OPS>                        181154271
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                    (15628718)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                       11304151
<NUMBER-OF-SHARES-REDEEMED>                  (5688380)
<SHARES-REINVESTED>                            1070209
<NET-CHANGE-IN-ASSETS>                       417021778
<ACCUMULATED-NII-PRIOR>                              0
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<OVERDISTRIB-NII-PRIOR>                        (22700)
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<GROSS-EXPENSE>                                3169298
<AVERAGE-NET-ASSETS>                         374613585
<PER-SHARE-NAV-BEGIN>                            11.34
<PER-SHARE-NII>                                 (0.04)
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<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.68)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              16.63
<EXPENSE-RATIO>                                   1.24


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 042
   <NAME> MFS MID CAP GROWTH FUND - CLASS B
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                        499290854
<INVESTMENTS-AT-VALUE>                       616227551
<RECEIVABLES>                                 23609000
<ASSETS-OTHER>                                    1585
<OTHER-ITEMS-ASSETS>                          97673613
<TOTAL-ASSETS>                               737511749
<PAYABLE-FOR-SECURITIES>                       6279010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     99680398
<TOTAL-LIABILITIES>                          105959408
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     449067535
<SHARES-COMMON-STOCK>                         19250825
<SHARES-COMMON-PRIOR>                          9974887
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (1980105)
<ACCUMULATED-NET-GAINS>                       67528215
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     116936696
<NET-ASSETS>                                 631552341
<DIVIDEND-INCOME>                               182108
<INTEREST-INCOME>                               911420
<OTHER-INCOME>                                  106040
<EXPENSES-NET>                               (3156973)
<NET-INVESTMENT-INCOME>                      (1957405)
<REALIZED-GAINS-CURRENT>                      79247882
<APPREC-INCREASE-CURRENT>                    103863794
<NET-CHANGE-FROM-OPS>                        181154271
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                    (21101259)
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<NUMBER-OF-SHARES-SOLD>                       12438123
<NUMBER-OF-SHARES-REDEEMED>                  (4596087)
<SHARES-REINVESTED>                            1433902
<NET-CHANGE-IN-ASSETS>                       417021778
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     29630112
<OVERDISTRIB-NII-PRIOR>                        (22700)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1399561
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                3169298
<AVERAGE-NET-ASSETS>                         374613585
<PER-SHARE-NAV-BEGIN>                            11.16
<PER-SHARE-NII>                                 (0.09)
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<PER-SHARE-DISTRIBUTIONS>                       (1.62)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              16.33
<EXPENSE-RATIO>                                   1.99


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 043
   <NAME> MFS MID CAP GROWTH FUND - CLASS C
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                        499290854
<INVESTMENTS-AT-VALUE>                       616227551
<RECEIVABLES>                                 23609000
<ASSETS-OTHER>                                    1585
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<TOTAL-ASSETS>                               737511749
<PAYABLE-FOR-SECURITIES>                       6279010
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     99680398
<TOTAL-LIABILITIES>                          105959408
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     449067535
<SHARES-COMMON-STOCK>                          4829632
<SHARES-COMMON-PRIOR>                          1643790
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (1980105)
<ACCUMULATED-NET-GAINS>                       67528215
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     116936696
<NET-ASSETS>                                 631552341
<DIVIDEND-INCOME>                               182108
<INTEREST-INCOME>                               911420
<OTHER-INCOME>                                  106040
<EXPENSES-NET>                               (3156973)
<NET-INVESTMENT-INCOME>                      (1957405)
<REALIZED-GAINS-CURRENT>                      79247882
<APPREC-INCREASE-CURRENT>                    103863794
<NET-CHANGE-FROM-OPS>                        181154271
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                     (4328223)
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<NUMBER-OF-SHARES-SOLD>                        4208810
<NUMBER-OF-SHARES-REDEEMED>                  (1318731)
<SHARES-REINVESTED>                             295763
<NET-CHANGE-IN-ASSETS>                       417021778
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     29630112
<OVERDISTRIB-NII-PRIOR>                        (22700)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1399561
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                3169298
<AVERAGE-NET-ASSETS>                         374613585
<PER-SHARE-NAV-BEGIN>                            11.01
<PER-SHARE-NII>                                 (0.09)
<PER-SHARE-GAIN-APPREC>                           6.78
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.64)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              16.06
<EXPENSE-RATIO>                                   1.99


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063068
<NAME> MFS SERIES TRUST IV
<SERIES>
   <NUMBER> 044
   <NAME> MFS MID CAP GROWTH FUND - CLASS I
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          AUG-31-2000
<PERIOD-START>                             SEP-01-1999
<PERIOD-END>                               FEB-29-2000
<INVESTMENTS-AT-COST>                        499290854
<INVESTMENTS-AT-VALUE>                       616227551
<RECEIVABLES>                                 23609000
<ASSETS-OTHER>                                    1585
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<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                     99680398
<TOTAL-LIABILITIES>                          105959408
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     449067535
<SHARES-COMMON-STOCK>                           378805
<SHARES-COMMON-PRIOR>                           162000
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                       (1980105)
<ACCUMULATED-NET-GAINS>                       67528215
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                     116936696
<NET-ASSETS>                                 631552341
<DIVIDEND-INCOME>                               182108
<INTEREST-INCOME>                               911420
<OTHER-INCOME>                                  106040
<EXPENSES-NET>                               (3156973)
<NET-INVESTMENT-INCOME>                      (1957405)
<REALIZED-GAINS-CURRENT>                      79247882
<APPREC-INCREASE-CURRENT>                    103863794
<NET-CHANGE-FROM-OPS>                        181154271
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                      (291579)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         223770
<NUMBER-OF-SHARES-REDEEMED>                    (28467)
<SHARES-REINVESTED>                              21502
<NET-CHANGE-IN-ASSETS>                       417021778
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                     29630112
<OVERDISTRIB-NII-PRIOR>                        (22700)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                          1399561
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                3169298
<AVERAGE-NET-ASSETS>                         374613585
<PER-SHARE-NAV-BEGIN>                            11.37
<PER-SHARE-NII>                                 (0.02)
<PER-SHARE-GAIN-APPREC>                           7.00
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (1.69)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              16.66
<EXPENSE-RATIO>                                   0.99


</TABLE>


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