MFS SERIES TRUST X
NSAR-A, 1997-03-27
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<PAGE>      PAGE  1
000 A000000 01/31/97
000 C000000 0000783740
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 X
001 B000000 811-4492
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  1
007 C010100  1
007 C020100 MFS GOVERNMENT MORTGAGE FUND
007 C030100 N
007 C010200  2
007 C010300  3
007 C010400  4
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
020 C000001      0
020 C000002      0
020 C000003      0
020 C000004      0
020 C000005      0
020 C000006      0
020 C000007      0
020 C000008      0
020 C000009      0
020 C000010      0
021  000000        0
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001   3183901
022 D000001     31698
022 A000002 MERRILL LYNCH
022 B000002 13-5674085
<PAGE>      PAGE  2
022 C000002     51802
022 D000002     91288
022 A000003 CS FIRST BOSTON CORP.
022 B000003 13-5659485
022 C000003     79838
022 D000003         0
022 A000004 BANKERS TRUST
022 B000004 13-4941247
022 C000004     22654
022 D000004     26475
022 A000005 MORGAN STANLEY
022 B000005 13-2655998
022 C000005     19884
022 D000005         0
022 A000006 SALOMON BROTHERS
022 B000006 13-3082694
022 C000006         0
022 D000006      7962
022 A000007 LEHMAN BROTHERS
022 B000007 13-2518466
022 C000007         0
022 D000007      7799
022 C000008         0
022 D000008         0
022 C000009         0
022 D000009         0
022 C000010         0
022 D000010         0
023 C000000    3358078
023 D000000     166935
026 A000000 Y
026 B000000 Y
026 C000000 N
026 D000000 Y
026 E000000 N
026 F000000 N
026 G010000 N
026 G020000 N
026 H000000 N
027  000000 Y
077 A000000 Y
077 D000000 Y
077 I000000 Y
077 Q010000 Y
078  000000 N
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
<PAGE>      PAGE  3
086 D010000      0
086 D020000      0
086 E010000      0
086 E020000      0
086 F010000      0
086 F020000      0
008 A000101 MASSACHUSETTS FINANCIAL SERVICES COMPANY
008 B000101 A
008 C000101 801-17352
008 D010101 BOSTON
008 D020101 MA
008 D030101 02116
011 A000101 MFS FUND DISTRIBUTORS, INC.
011 B000101 8-27864
011 C010101 BOSTON
011 C020101 MA
011 C030101 02116
012 A000101 MFS SERVICE CENTER, INC.
012 B000101 84-1316
012 C010101 BOSTON
012 C020101 MA
012 C030101 02116
013 A000101 DELOITTE & TOUCHE LLP
013 B010101 BOSTON
013 B020101 MA
013 B030101 02110
015 A000101 STATE STREET BANK AND TRUST COMPANY
015 B000101 C
015 C010101 BOSTON
015 C020101 MA
015 C030101 02110
015 E010101 X
015 A000102 STATE STREET BANK AND TRUST COMPANY
015 B000102 S
015 C010102 BOSTON
015 C020102 MA
015 C030102 02110
015 E040102 X
015 A000103 THE BANK OF NEW YORK
015 B000103 S
015 C010103 NEW YORK
015 C020103 NY
015 C030103 10286
015 E010103 X
018  000100 Y
019 A000100 Y
019 B000100   53
019 C000100 MASSFINSER
024  000100 Y
025 A000101 GOLDMAN SACHS
025 B000101 13-5108880
<PAGE>      PAGE  4
025 C000101 D
025 D000101   11699
025 D000102       0
025 D000103       0
025 D000104       0
025 D000105       0
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100     17099
028 A020100      2506
028 A030100         0
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028 B010100     12461
028 B020100      2633
028 B030100         0
028 B040100     32604
028 C010100     16354
028 C020100      2623
028 C030100         0
028 C040100     35621
028 D010100     19227
028 D020100      2560
028 D030100         0
028 D040100     37254
028 E010100     19175
028 E020100      2525
028 E030100         0
028 E040100     32554
028 F010100    187961
028 F020100      2507
028 F030100         0
028 F040100    212665
028 G010100    272277
028 G020100     15354
028 G030100         0
028 G040100    383154
028 H000100    195767
029  000100 Y
030 A000100     76
030 B000100  4.75
030 C000100  0.00
031 A000100     13
031 B000100      0
032  000100     63
033  000100      0
034  000100 Y
035  000100    187
036 A000100 N
036 B000100      0
037  000100 N
<PAGE>      PAGE  5
038  000100      0
039  000100 N
040  000100 Y
041  000100 Y
042 A000100   0
042 B000100   0
042 C000100  62
042 D000100  38
042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
043  000100   3586
044  000100      0
045  000100 Y
046  000100 N
047  000100 Y
048  000100  0.450
048 A010100        0
048 A020100 0.000
048 B010100        0
048 B020100 0.000
048 C010100        0
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048 D010100        0
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048 E010100        0
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048 F010100        0
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048 H010100        0
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048 I010100        0
048 I020100 0.000
048 J010100        0
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048 K010100        0
048 K020100 0.000
049  000100 N
050  000100 N
051  000100 N
052  000100 N
053 A000100 Y
053 B000100 N
053 C000100 Y
054 A000100 Y
054 B000100 Y
054 C000100 N
054 D000100 N
<PAGE>      PAGE  6
054 E000100 N
054 F000100 N
054 G000100 N
054 H000100 Y
054 I000100 N
054 J000100 Y
054 K000100 N
054 L000100 N
054 M000100 Y
054 N000100 N
054 O000100 N
055 A000100 N
055 B000100 N
056  000100 Y
057  000100 N
058 A000100 N
059  000100 Y
060 A000100 Y
060 B000100 Y
061  000100     1000
062 A000100 Y
062 B000100   0.0
062 C000100   0.0
062 D000100   1.2
062 E000100   0.0
062 F000100   0.0
062 G000100   0.0
062 H000100   0.0
062 I000100   0.0
062 J000100   0.0
062 K000100   0.0
062 L000100   0.0
062 M000100   4.3
062 N000100  93.7
062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100   0.0
063 A000100   0
063 B000100  9.6
064 A000100 Y
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
<PAGE>      PAGE  7
070 C010100 Y
070 C020100 N
070 D010100 N
070 D020100 N
070 E010100 Y
070 E020100 Y
070 F010100 N
070 F020100 N
070 G010100 Y
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 N
070 L010100 N
070 L020100 N
070 M010100 N
070 M020100 N
070 N010100 Y
070 N020100 N
070 O010100 Y
070 O020100 N
070 P010100 Y
070 P020100 N
070 Q010100 N
070 Q020100 N
070 R010100 Y
070 R020100 N
071 A000100    126079
071 B000100    215056
071 C000100    901580
071 D000100   14
072 A000100  6
072 B000100    41443
072 C000100        0
072 D000100        0
072 E000100        0
072 F000100     2402
072 G000100        0
072 H000100        0
072 I000100      930
072 J000100      198
072 K000100       91
072 L000100       65
072 M000100       35
072 N000100        0
072 O000100        0
<PAGE>      PAGE  8
072 P000100        0
072 Q000100        0
072 R000100       21
072 S000100        3
072 T000100     3565
072 U000100        0
072 V000100        0
072 W000100      318
072 X000100     7628
072 Y000100      176
072 Z000100    33991
072AA000100        0
072BB000100     7861
072CC010100    19635
072CC020100        0
072DD010100    17489
072DD020100    15427
072EE000100        0
073 A010100   0.2200
073 A020100   0.1900
073 B000100   0.0000
073 C000100   0.0000
074 A000100      176
074 B000100    11699
074 C000100        0
074 D000100   991612
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100        0
074 K000100        0
074 L000100    10548
074 M000100       14
074 N000100  1014049
074 O000100        0
074 P000100       24
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100     2563
074 S000100        0
074 T000100  1011462
074 U010100   103838
074 U020100    49239
074 V010100     6.61
074 V020100     6.61
074 W000100   0.0000
074 X000100    67163
<PAGE>      PAGE  9
074 Y000100     1160
075 A000100        0
075 B000100  1059309
076  000100     0.00
080 C000100        0
081 B000100   0
082 B000100        0
083 A000100 N
083 B000100        0
084 A000100 N
084 B000100        0
085 A000100 Y
085 B000100 N
SIGNATURE   JAMES YOST                                   
TITLE       ASSISTANT TREASURER 
 


<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 011
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1997
<PERIOD-START>                             AUG-01-1996
<PERIOD-END>                               JAN-31-1997
<INVESTMENTS-AT-COST>                       1002984990
<INVESTMENTS-AT-VALUE>                      1003310470 
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X 
<SERIES>
   <NUMBER> 012
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
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<INVESTMENTS-AT-COST>                       1002984990
<INVESTMENTS-AT-VALUE>                      1003310470 
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<TOTAL-ASSETS>                              1014048801
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<SHARES-COMMON-PRIOR>                         84751781
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<OVERDIST-NET-GAINS-PRIOR>                 (121061407)                                                                            
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X 
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   <NUMBER> 013
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
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</TABLE>


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