MFS SERIES TRUST IX /MA/
NSAR-B, 1997-06-25
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<PAGE>      PAGE  1
000 B000000 04/30/97
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
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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
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007 C020300 MFS MUNICIPAL LIMITED MATURITY FUND
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007 C011600 16
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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
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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
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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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SIGNATURE   JAMES O. YOST                                
TITLE       ASSISTANT TREASURER 
 


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<NAME> MFS SERIES TRUST IX
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<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS B
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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS A
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<NAME> MFS SERIES TRUST IX
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<TABLE> <S> <C>

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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NAME> MFS LIMITED MATURITY FUND CLASS B
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<S>                             <C>
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<TABLE> <S> <C>

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<CIK> 0000063075
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   <NAME> MFS LIMITED MATURITY FUND CLASS A
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 014
   <NAME> MFS FINANCIAL BOND FUND CLASS I
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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
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          APR-30-1997
<PERIOD-START>                             MAY-01-1996
<PERIOD-END>                               APR-30-1997
<INVESTMENTS-AT-COST>                        682914959
<INVESTMENTS-AT-VALUE>                       681668976
<RECEIVABLES>                                 46493021
<ASSETS-OTHER>                                   46598
<OTHER-ITEMS-ASSETS>                             97574
<TOTAL-ASSETS>                               728306169
<PAYABLE-FOR-SECURITIES>                      31116288
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2883399
<TOTAL-LIABILITIES>                           33999687
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     709152020
<SHARES-COMMON-STOCK>                          1541622
<SHARES-COMMON-PRIOR>                          1354678
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<DIVIDEND-INCOME>                               257770
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<EQUALIZATION>                                       0
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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
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          APR-30-1997
<PERIOD-START>                             MAY-01-1996
<PERIOD-END>                               APR-30-1997
<INVESTMENTS-AT-COST>                        682914959
<INVESTMENTS-AT-VALUE>                       681668976
<RECEIVABLES>                                 46493021
<ASSETS-OTHER>                                   46598
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<TOTAL-ASSETS>                               728306169
<PAYABLE-FOR-SECURITIES>                      31116288
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2883399
<TOTAL-LIABILITIES>                           33999687
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     709152020
<SHARES-COMMON-STOCK>                          9468112
<SHARES-COMMON-PRIOR>                          8043577
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 011
   <NAME> MFS FINANCIAL BOND FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          APR-30-1997
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<INVESTMENTS-AT-COST>                        682914959
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<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     709152020
<SHARES-COMMON-STOCK>                         41536538
<SHARES-COMMON-PRIOR>                         40067641
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<REALIZED-GAINS-CURRENT>                     (1867678)
<APPREC-INCREASE-CURRENT>                     11478331
<NET-CHANGE-FROM-OPS>                         56457720
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                   (37940150)
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<NUMBER-OF-SHARES-SOLD>                       19892064
<NUMBER-OF-SHARES-REDEEMED>                 (20523847)
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<NET-CHANGE-IN-ASSETS>                        59170684
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<OVERDISTRIB-NII-PRIOR>                       (228954)
<OVERDIST-NET-GAINS-PRIOR>                  (12975480)
<GROSS-ADVISORY-FEES>                          2708535
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<GROSS-EXPENSE>                                7843266
<AVERAGE-NET-ASSETS>                         672402796
<PER-SHARE-NAV-BEGIN>                            12.85
<PER-SHARE-NII>                                   0.94
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<PER-SHARE-DIVIDEND>                            (0.93)
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<EXPENSE-RATIO>                                   1.02
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</TABLE>


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