MFS SERIES TRUST IX /MA/
NSAR-A, 1997-12-24
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<PAGE>      PAGE  1
000 A000000 10/31/97
000 C000000 0000063075
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 IX
001 B000000 811-2464
001 C000000 6179545000
002 A000000 500 BOYLSTON STREET
002 B000000 BOSTON
002 C000000 MA
002 D010000 02116
003  000000 N
004  000000 N
005  000000 N
006  000000 N
007 A000000 Y
007 B000000  3
007 C010100  1
007 C020100 MFS BOND FUND
007 C030100 N
007 C010200  2
007 C020200 MFS LIMITED MATURITY FUND
007 C030200 N
007 C010300  3
007 C020300 MFS MUNICIPAL LIMITED MATURITY FUND
007 C030300 N
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
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007 C011600 16
007 C011700 17
007 C011800 18
007 C011900 19
007 C012000 20
008 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B00AA01 A
008 C00AA01 801-17352
<PAGE>      PAGE  2
008 D01AA01 BOSTON
008 D02AA01 MA
008 D03AA01 02116
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICE COMPAMY
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 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.
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
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<PAGE>      PAGE  3
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<PAGE>      PAGE  4
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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<PAGE>      PAGE  16
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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070 Q010300 N
070 Q020300 N
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071 D000300   32
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072 N000300       21
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072 X000300      288
072 Y000300       33
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<PAGE>      PAGE  20
072EE000300        0
073 A010300   0.1500
073 A020300   0.1200
073 B000300   0.0000
073 C000300   0.0000
074 A000300        1
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074 C000300        0
074 D000300    50460
074 E000300        0
074 F000300        0
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074 H000300        0
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074 N000300    52569
074 O000300     3548
074 P000300       10
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074 R020300        0
074 R030300        0
074 R040300      126
074 S000300        0
074 T000300    48885
074 U010300     5150
074 U020300      905
074 V010300     7.59
074 V020300     7.58
074 W000300   0.0000
074 X000300     1513
074 Y000300        0
075 A000300        0
075 B000300    48812
076  000300     0.00
SIGNATURE   ELLEN MOYNIHAN                               
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NUMBER> 011
   <NAME> MFS FINANCIAL BOND FUND CLASS A
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 012
   <NAME> MFS FINANCIAL BOND FUND CLASS B
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 013
   <NAME> MFS FINANCIAL BOND FUND CLASS C
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NUMBER> 014
   <NAME> MFS FINANCIAL BOND FUND CLASS I
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<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 021
   <NAME> MFS LIMITED MATURITY FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 022
   <NAME> MFS LIMITED MATURITY FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 023
   <NAME> MFS LIMITED MATURITY FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                  6-mos
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 024
   <NAME> MFS LIMITED MATURITY FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                  6-mos
<FISCAL-YEAR-END>                          APR-30-1998
<PERIOD-START>                             MAY-01-1997
<PERIOD-END>                               OCT-31-1997
<INVESTMENTS-AT-COST>                        161222114
<INVESTMENTS-AT-VALUE>                       162413885
<RECEIVABLES>                                 11293737
<ASSETS-OTHER>                                   14133
<OTHER-ITEMS-ASSETS>                              4949
<TOTAL-ASSETS>                               173726704
<PAYABLE-FOR-SECURITIES>                       7441221
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      9054282
<TOTAL-LIABILITIES>                           16495503
<SENIOR-EQUITY>                                      0
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<SHARES-COMMON-STOCK>                           400431
<SHARES-COMMON-PRIOR>                           273334
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<REALIZED-GAINS-CURRENT>                      (373941)
<APPREC-INCREASE-CURRENT>                      1869798
<NET-CHANGE-FROM-OPS>                          6331720
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (74398)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                            (249)
<NUMBER-OF-SHARES-SOLD>                         126835                 
<NUMBER-OF-SHARES-REDEEMED>                     (8082)
<SHARES-REINVESTED>                               8344
<NET-CHANGE-IN-ASSETS>                         9681310
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 031
   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-Mos
<FISCAL-YEAR-END>                          APR-30-1998
<PERIOD-START>                             MAY-01-1997
<PERIOD-END>                               OCT-31-1997
<INVESTMENTS-AT-COST>                         49643626
<INVESTMENTS-AT-VALUE>                        50459641
<RECEIVABLES>                                  2107557
<ASSETS-OTHER>                                    1370
<OTHER-ITEMS-ASSETS>                               484
<TOTAL-ASSETS>                                52569052
<PAYABLE-FOR-SECURITIES>                       3548288
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       135356
<TOTAL-LIABILITIES>                            3683644
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      48853472
<SHARES-COMMON-STOCK>                          5150232
<SHARES-COMMON-PRIOR>                          5461987
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<OVERDISTRIBUTION-GAINS>                      (813591)
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<APPREC-INCREASE-CURRENT>                       529181
<NET-CHANGE-FROM-OPS>                          1513311
<EQUALIZATION>                                       0
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<PER-SHARE-NAV-BEGIN>                             7.50
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 032
   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-mos
<FISCAL-YEAR-END>                          APR-30-1998
<PERIOD-START>                             MAY-01-1997
<PERIOD-END>                               OCT-31-1997
<INVESTMENTS-AT-COST>                         49643626
<INVESTMENTS-AT-VALUE>                        50459641
<RECEIVABLES>                                  2107557
<ASSETS-OTHER>                                    1370
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<TOTAL-ASSETS>                                52569052
<PAYABLE-FOR-SECURITIES>                       3548288
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       135356
<TOTAL-LIABILITIES>                            3683644
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      48853472
<SHARES-COMMON-STOCK>                           905309
<SHARES-COMMON-PRIOR>                           868468
<ACCUMULATED-NII-CURRENT>                        29512
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (813591)
<ACCUM-APPREC-OR-DEPREC>                        816015
<NET-ASSETS>                                  48885408
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              1178821
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (254918)
<NET-INVESTMENT-INCOME>                         923903
<REALIZED-GAINS-CURRENT>                         60227
<APPREC-INCREASE-CURRENT>                       529181
<NET-CHANGE-FROM-OPS>                          1513311
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                     (105246)
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                         141959
<NUMBER-OF-SHARES-REDEEMED>                   (112652)
<SHARES-REINVESTED>                               7534
<NET-CHANGE-IN-ASSETS>                       (1868176)
<ACCUMULATED-NII-PRIOR>                          30661
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                    (873818)
<GROSS-ADVISORY-FEES>                            98274
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 287585
<AVERAGE-NET-ASSETS>                           6614022
<PER-SHARE-NAV-BEGIN>                             7.49
<PER-SHARE-NII>                                   0.12
<PER-SHARE-GAIN-APPREC>                           0.09
<PER-SHARE-DIVIDEND>                            (0.12)
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<EXPENSE-RATIO>                                   1.65
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<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 033
   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-mos
<FISCAL-YEAR-END>                          APR-30-1998
<PERIOD-START>                             MAY-01-1997
<PERIOD-END>                               OCT-31-1997
<INVESTMENTS-AT-COST>                         49643626
<INVESTMENTS-AT-VALUE>                        50459641
<RECEIVABLES>                                  2107557
<ASSETS-OTHER>                                    1370
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<PAYABLE-FOR-SECURITIES>                       3548288
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<OTHER-ITEMS-LIABILITIES>                       135356
<TOTAL-LIABILITIES>                            3683644
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      48853472
<SHARES-COMMON-STOCK>                          	387643
<SHARES-COMMON-PRIOR>                           439688
<ACCUMULATED-NII-CURRENT>                        29512
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                      (813591)
<ACCUM-APPREC-OR-DEPREC>                        816015
<NET-ASSETS>                                  48885408
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                              1178821
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                (254918)
<NET-INVESTMENT-INCOME>                         923903
<REALIZED-GAINS-CURRENT>                         60227
<APPREC-INCREASE-CURRENT>                       529181
<NET-CHANGE-FROM-OPS>                          1513311
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (46878)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          62762
<NUMBER-OF-SHARES-REDEEMED>                   (120626)
<SHARES-REINVESTED>                               5819
<NET-CHANGE-IN-ASSETS>                       (1868176)
<ACCUMULATED-NII-PRIOR>                          30661
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                    (873818)
<GROSS-ADVISORY-FEES>                            98274
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 287585
<AVERAGE-NET-ASSETS>                           3034107
<PER-SHARE-NAV-BEGIN>                             7.50
<PER-SHARE-NII>                                   0.12
<PER-SHARE-GAIN-APPREC>                           0.09
<PER-SHARE-DIVIDEND>                            (0.12)
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<PER-SHARE-NAV-END>                               7.59
<EXPENSE-RATIO>                                   1.73
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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