MFS SERIES TRUST IX /MA/
NSAR-B, 1996-06-28
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<PAGE>      PAGE  1
000 B000000 04/30/96
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
007 C010900  9
007 C011000 10
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.
012 B00AA01 84-1316
<PAGE>      PAGE  2
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   50
019 C00AA00 MASSFINSER
020 C000001      0
020 C000002      0
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022 A000002 GOLDMAN SACHS
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022 D000002    370885
022 A000003 PRUDENTIAL BACHE
022 B000003 22-2347336
022 C000003   1458460
022 D000003     32128
022 A000004 MERRILL LYNCH
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022 C000004    445194
022 D000004    354717
022 A000005 SALOMON BROS
022 B000005 13-3082694
022 C000005    204453
022 D000005    282996
022 A000006 CS FIRST BOSTON
022 B000006 13-5659485
022 C000006    246409
022 D000006    172858
022 A000007 MORGAN STANLEY
022 B000007 13-2655998
022 C000007    209666
022 D000007    158276
022 A000008 GREENWICH CAPITAL MARKETS
<PAGE>      PAGE  3
022 B000008 13-2697091
022 C000008    200960
022 D000008    164158
022 A000009 MORGAN J.P. SECURITIES
022 B000009 13-3224016
022 C000009    139362
022 D000009    218847
022 A000010 PAINE WEBBER
022 B000010 13-2638166
022 C000010    172013
022 D000010    176864
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023 D000000    3526629
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054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
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060 B00AA00 Y
061  00AA00     1000
077 A000000 Y
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077 P000000 Y
078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 ICI MUTUAL
080 C00AA00    65000
<PAGE>      PAGE  4
081 A00AA00 Y
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015 A000101 INVESTORS BANK & TRUST COMPANY
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<PAGE>      PAGE  5
015 E040103 X
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
070 E010100 Y
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<PAGE>      PAGE  9
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<PAGE>      PAGE  10
015 A000201 INVESTORS BANK & TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02111
015 E010201 X
015 A000202 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
015 B000203 S
015 C010203 NEW YORK
015 C020203 NY
015 C030203 10036
015 E040203 X
024  000200 N
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<PAGE>      PAGE  11
030 C000200  0.00
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036 A000200 N
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039  000200 N
040  000200 Y
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<PAGE>      PAGE  12
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 N
053 C000200 Y
055 A000200 N
055 B000200 N
056  000200 Y
057  000200 N
062 A000200 Y
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062 N000200  26.2
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064 A000200 Y
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070 A010200 Y
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070 C020200 N
070 D010200 N
070 D020200 N
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070 E020200 N
070 F010200 N
070 F020200 N
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<PAGE>      PAGE  13
070 H010200 N
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
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<PAGE>      PAGE  14
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015 A000301 STATE STREET BANK & TRUST COMPANY
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<PAGE>      PAGE  15
015 A000302 BANK OF NEW YORK
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015 A000303 CHEMICAL BANK
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015 C030303 10041
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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
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024  000300 N
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<PAGE>      PAGE  16
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<PAGE>      PAGE  17
048 I020300 0.000
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049  000300 N
050  000300 N
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<PAGE>      PAGE  18
070 E010300 Y
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<PAGE>      PAGE  19
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074 I000300        0
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074 P000300       90
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300       73
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074 U020300     1031
074 V010300     7.53
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<PAGE>      PAGE  20
SIGNATURE   JAMES O. YOST                                
TITLE       ASSISTANT TREASURER 
 


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

<TABLE> <S> <C>

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<NAME> MFS SERIES TRUST IX
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   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS A
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   <NAME> MFS MUNICIPAL LIMITED MATURITY FUND CLASS B
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</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>
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<INVESTMENTS-AT-VALUE>                        57003410
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</TABLE>


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