MFS SERIES TRUST IX /MA/
NSAR-B, 1998-06-29
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<PAGE>      PAGE  1
000 B000000 04/30/98
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 U
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
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
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
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   55
019 C00AA00 MASSFINSER
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022 A000001 GOLDMAN SACHS AND CO.
022 B000001 13-5108880
022 C000001   1321760
022 D000001    142975
022 A000002 MERRILL LYNCH
022 B000002 13-5674085
022 C000002    319476
022 D000002    382191
022 A000003 SALOMON BROTHERS
022 B000003 13-3082694
022 C000003    319650
022 D000003    263504
022 A000004 LEHMAN
022 B000004 13-2518466
<PAGE>      PAGE  3
022 C000004    181606
022 D000004    167497
022 A000005 UBS SECURITIES
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022 C000005    141812
022 D000005    146033
022 A000006 DEUTSCHE BANK SECURITIES CORP.
022 B000006 13-2730828
022 C000006     95324
022 D000006    118592
022 A000007 MORGAN (JP)
022 B000007 13-3224016
022 C000007     96864
022 D000007     72881
022 A000008 CS FIRST BOSTON
022 B000008 13-5659485
022 C000008     99148
022 D000008     65546
022 A000009 PAINE WEBBER
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022 C000009     63373
022 D000009     81092
022 A000010 MORGAN STANLEY
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054 F00AA00 N
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054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
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<PAGE>      PAGE  4
054 N00AA00 Y
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058 A00AA00 N
059  00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061  00AA00     1000
077 A000000 Y
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080 B00AA00 ICI MUTUAL
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015 A000101 STATE STREET BANK AND TRUST CO.
015 B000101 C
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015 B000102 S
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015 A000103 CHASE MANHATTAN BANK N.A.
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<PAGE>      PAGE  5
015 C030103 10018
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
048 B020100 0.000
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052  000100 N
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055 A000100 Y
055 B000100 N
056  000100 Y
057  000100 N
062 A000100 Y
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063 B000100 18.6
064 A000100 Y
<PAGE>      PAGE  8
064 B000100 Y
065  000100 N
066 A000100 N
067  000100 N
068 A000100 N
068 B000100 N
069  000100 N
070 A010100 Y
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070 D010100 N
070 D020100 N
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070 E020100 Y
070 F010100 N
070 F020100 N
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070 G020100 N
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 Y
070 K010100 Y
070 K020100 Y
070 L010100 Y
070 L020100 Y
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070 M020100 Y
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070 O020100 Y
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
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076  000100     0.00
015 A000201 STATE STREET BANK AND TRUST CO.
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
015 A000203 CHASE MANHATTAN BANK N.A.
015 B000203 S
015 C010203 NEW YORK
015 C020203 NY
015 C030203 10018
015 E040203 X
024  000200 Y
025 A000201 LEHMAN BROTHERS HOLDING INC
025 B000201 13-2518466
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<PAGE>      PAGE  11
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033  000200      0
034  000200 Y
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036 A000200 N
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037  000200 N
038  000200      0
039  000200 N
040  000200 Y
041  000200 Y
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042 F000200   0
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<PAGE>      PAGE  12
043  000200    724
044  000200      0
045  000200 Y
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048 B010200        0
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048 C010200        0
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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
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062 B000200   0.0
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062 F000200   0.0
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<PAGE>      PAGE  13
062 M000200   4.5
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062 P000200  73.3
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063 A000200   0
063 B000200  3.8
064 A000200 Y
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 Y
070 E020200 Y
070 F010200 N
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 N
070 K010200 Y
070 K020200 Y
070 L010200 Y
070 L020200 Y
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070 M020200 N
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070 O010200 Y
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070 P010200 Y
070 P020200 N
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070 Q020200 N
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
073 B000200   0.0000
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015 A000301 STATE STREET BANK AND TRUST CO.
015 B000301 C
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015 A000302 THE BANK OF NEW YORK
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<PAGE>      PAGE  16
028 A030300         0
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038  000300      0
039  000300 N
040  000300 Y
041  000300 Y
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<PAGE>      PAGE  17
042 H000300   0
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048 J010300        0
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049  000300 N
050  000300 N
051  000300 N
052  000300 N
053 A000300 Y
053 B000300 Y
053 C000300 Y
055 A000300 Y
055 B000300 N
056  000300 Y
057  000300 N
062 A000300 Y
062 B000300   0.0
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<PAGE>      PAGE  18
062 L000300   0.0
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070 B020300 N
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070 D020300 N
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070 E020300 N
070 F010300 N
070 F020300 N
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070 G020300 N
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070 H020300 N
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070 I020300 N
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070 J020300 N
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070 Q020300 N
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<PAGE>      PAGE  19
070 R020300 N
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SIGNATURE   ELLEN MOYNIHAN                               
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

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<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NAME> MFS BOND FUND CLASS A
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
<SERIES>
   <NUMBER> 012
   <NAME> MFS BOND 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> 013
   <NAME> MFS 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 BOND FUND CLASS I
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000063075
<NAME> MFS SERIES TRUST IX
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   <NUMBER> 021
   <NAME> MFS LIMITED MATURITY 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
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   <NUMBER> 022
   <NAME> MFS LIMITED MATURITY FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
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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 C
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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> 024
   <NAME> MFS LIMITED MATURITY FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

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


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