MFS SERIES TRUST X
NSAR-A, 1999-03-30
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<PAGE>      PAGE  1
000 A000000 01/31/1999
000 C000000 0000783740
000 D000000 N
000 E000000 NF
000 F000000 Y
000 G000000 N
000 H000000 N
000 I000000 6.1
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  4
007 C010100  1
007 C020100 MFS GOVERNMENT MORTGAGE FUND
007 C030100 N
007 C010200  2
007 C020200 MFS EMERGING MARKETS DEBT FUND
007 C030200 N
007 C010300  3
007 C020300 MFS SMALL CAP VALUE FUND
007 C030300 N
007 C010400  4
007 C020400 MFS STRATEGIC VALUE FUND
007 C030400 N
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
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
<PAGE>      PAGE  2
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
015 A00AA01 STATE STREET BANK AND TRUST COMPANY
015 B00AA01 C
015 C01AA01 BOSTON
015 C02AA01 MA
015 C03AA01 02110
015 E01AA01 X
015 A00AA02 STATE STREET BANK AND TRUST COMPANY
015 B00AA02 S
015 C01AA02 BOSTON
015 C02AA02 MA
015 C03AA02 02110
015 E04AA02 X
015 A00AA03 THE BANK OF NEW YORK
015 B00AA03 S
015 C01AA03 NEW YORK
015 C02AA03 NY
015 C03AA03 10286
015 E01AA03 X
018  00AA00 Y
019 A00AA00 Y
019 B00AA00   74
019 C00AA00 MASSFINSER
020 A000001 DUNLEVY & CO, INC.
020 B000001 00-0000000
020 C000001      1
020 A000002 INSTINET
020 B000002 13-3443395
020 C000002      0
020 A000003 SALOMOM SMITH BARNEY
020 B000003 13-1912900
020 C000003      0
020 A000004 FIRST BOSTON CORP.
020 B000004 13-5659485
020 C000004      0
020 A000005 JONES & ASSOCIATES
020 B000005 00-0000000
020 C000005      0
020 A000006 NATIONAL FINANCIAL SERVICES
020 B000006 00-0000000
020 C000006      0
020 A000007 GOLDMAN SACHS & CO.
<PAGE>      PAGE  3
020 B000007 13-5108880
020 C000007      0
020 A000008 NATIONS BANC MONTGOMERY
020 B000008 75-0520130
020 C000008      0
020 A000009 WEEDEN & CO.
020 B000009 13-3364318
020 C000009      0
020 A000010 MERRILL LYNCH PIERCE FENNER
020 B000010 13-5674085
020 C000010      0
021  000000        2
022 A000001 GOLDMAN SACHS & CO.
022 B000001 13-5108880
022 C000001   4995481
022 D000001    212029
022 A000002 MERRILL LYNCH
022 B000002 13-5674085
022 C000002    156942
022 D000002     96624
022 A000003 SOLOMON SMITH BARNEY
022 B000003 13-3082694
022 C000003    257294
022 D000003    219087
022 A000004 DEUTSCHE BANK
022 B000004 13-2730828
022 C000004     78021
022 D000004     77705
022 A000005 PAINE WEBBER
022 B000005 13-2638166
022 C000005     63972
022 D000005     90420
022 A000006 FIRST BOSTON CORP.
022 B000006 13-5659485
022 C000006     21262
022 D000006     45396
022 A000007 BANK BOSTON
022 B000007 00-0000000
022 C000007     27193
022 D000007        14
022 A000008 BEAR STEARNS
022 B000008 13-3299429
022 C000008     20182
022 D000008        27
022 A000009 MORGAN STANLEY
022 B000009 13-2655998
022 C000009        52
022 D000009      5121
022 A000010 CARROLL MCENTEE
022 B000010 13-2650270
022 C000010      4844
<PAGE>      PAGE  4
022 D000010         0
023 C000000    5633220
023 D000000     751369
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
037  00AA00 N
038  00AA00      0
039  00AA00 N
040  00AA00 Y
041  00AA00 Y
054 A00AA00 Y
054 B00AA00 N
054 C00AA00 N
054 D00AA00 N
054 E00AA00 N
054 F00AA00 N
054 G00AA00 N
054 H00AA00 Y
054 I00AA00 N
054 J00AA00 Y
054 K00AA00 N
054 L00AA00 N
054 M00AA00 Y
054 N00AA00 N
054 O00AA00 N
077 A000000 Y
077 H000000 Y
077 Q010000 Y
078  000000 N
080 C00AA00        0
081 B00AA00   0
082 B00AA00        0
083 B00AA00        0
084 B00AA00        0
086 A010000      0
086 A020000      0
086 B010000      0
086 B020000      0
086 C010000      0
086 C020000      0
086 D010000      0
086 D020000      0
086 E010000      0
<PAGE>      PAGE  5
086 E020000      0
086 F010000      0
086 F020000      0
013 A000101 DELOITTE & TOUCHE LLP
013 B010101 BOSTON
013 B020101 MA
013 B030101 02110
024  000100 Y
025 A000101 GOLDMAN SACHS
025 B000101 13-5108880
025 C000101 D
025 D000101   87973
025 D000102       0
025 D000103       0
025 D000104       0
025 D000105       0
025 D000106       0
025 D000107       0
025 D000108       0
028 A010100      6036
028 A020100      2066
028 A030100         0
028 A040100     15017
028 B010100     13571
028 B020100      2066
028 B030100         0
028 B040100     20097
028 C010100     13235
028 C020100      1930
028 C030100         0
028 C040100     23145
028 D010100     12400
028 D020100      1925
028 D030100         0
028 D040100     18981
028 E010100     10671
028 E020100      1900
028 E030100         0
028 E040100     22046
028 F010100     52760
028 F020100      1903
028 F030100         0
028 F040100     60860
028 G010100    108673
028 G020100     11790
028 G030100         0
028 G040100    160146
028 H000100    100586
029  000100 Y
030 A000100    115
030 B000100  4.75
<PAGE>      PAGE  6
030 C000100  0.00
031 A000100     20
031 B000100      0
032  000100     95
033  000100      0
034  000100 Y
035  000100     53
036 A000100 N
036 B000100      0
042 A000100   0
042 B000100   0
042 C000100  36
042 D000100  64
042 E000100   0
042 F000100   0
042 G000100   0
042 H000100   0
043  000100   1590
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
048 C020100 0.000
048 D010100        0
048 D020100 0.000
048 E010100        0
048 E020100 0.000
048 F010100        0
048 F020100 0.000
048 G010100        0
048 G020100 0.000
048 H010100        0
048 H020100 0.000
048 I010100        0
048 I020100 0.000
048 J010100        0
048 J020100 0.000
048 K010100        0
048 K020100 0.000
049  000100 N
050  000100 N
051  000100 N
052  000100 N
053 A000100 Y
053 B000100 Y
<PAGE>      PAGE  7
053 C000100 Y
055 A000100 Y
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  11.4
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   4.0
062 N000100  86.8
062 O000100   0.0
062 P000100   0.0
062 Q000100   0.0
062 R000100  -2.2
063 A000100   0
063 B000100  4.3
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
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
<PAGE>      PAGE  8
070 H010100 N
070 H020100 N
070 I010100 N
070 I020100 N
070 J010100 Y
070 J020100 N
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    739342
071 B000100    844114
071 C000100    761212
071 D000100   97
072 A000100  6
072 B000100    27223
072 C000100        0
072 D000100        0
072 E000100        0
072 F000100     1802
072 G000100       41
072 H000100        0
072 I000100      451
072 J000100      162
072 K000100       89
072 L000100       21
072 M000100       33
072 N000100        0
072 O000100        0
072 P000100        0
072 Q000100        0
072 R000100       19
072 S000100        4
072 T000100     1573
072 U000100        0
072 V000100        0
072 W000100      252
072 X000100     4447
072 Y000100      247
<PAGE>      PAGE  9
072 Z000100    23023
072AA000100        0
072BB000100     4908
072CC010100     6920
072CC020100        0
072DD010100    19328
072DD020100     4013
072EE000100        0
073 A010100   0.2000
073 A020100   0.1800
073 B000100   0.0000
073 C000100   0.0000
074 A000100        1
074 B000100    87973
074 C000100        0
074 D000100   702881
074 E000100        0
074 F000100        0
074 G000100        0
074 H000100        0
074 I000100        0
074 J000100    10207
074 K000100        0
074 L000100     4275
074 M000100        6
074 N000100   805343
074 O000100    19895
074 P000100      211
074 Q000100        0
074 R010100        0
074 R020100        0
074 R030100        0
074 R040100    11118
074 S000100        0
074 T000100   774119
074 U010100    99485
074 U020100    15881
074 V010100     6.71
074 V020100     6.72
074 W000100   0.0000
074 X000100    51260
074 Y000100        0
075 A000100        0
075 B000100   793673
076  000100     0.00
013 A000201 ERNST & YOUNG
013 B010201 BOSTON
013 B020201 MA
013 B030201 02116
024  000200 N
028 A010200         0
<PAGE>      PAGE  10
028 A020200         0
028 A030200         0
028 A040200         0
028 B010200         0
028 B020200         0
028 B030200         0
028 B040200         0
028 C010200        10
028 C020200         0
028 C030200         0
028 C040200         0
028 D010200         1
028 D020200         0
028 D030200         0
028 D040200         0
028 E010200         2
028 E020200        57
028 E030200         0
028 E040200         0
028 F010200         1
028 F020200         0
028 F030200         0
028 F040200         0
028 G010200        14
028 G020200        57
028 G030200         0
028 G040200         0
028 H000200         3
029  000200 N
030 A000200      0
030 B000200  0.00
030 C000200  0.00
031 A000200      0
031 B000200      0
032  000200      0
033  000200      0
034  000200 N
035  000200      0
036 B000200      0
042 A000200   0
042 B000200   0
042 C000200   0
042 D000200   0
042 E000200   0
042 F000200   0
042 G000200   0
042 H000200   0
043  000200      0
044  000200      0
045  000200 Y
046  000200 N
<PAGE>      PAGE  11
047  000200 Y
048  000200  0.850
048 A010200        0
048 A020200 0.000
048 B010200        0
048 B020200 0.000
048 C010200        0
048 C020200 0.000
048 D010200        0
048 D020200 0.000
048 E010200        0
048 E020200 0.000
048 F010200        0
048 F020200 0.000
048 G010200        0
048 G020200 0.000
048 H010200        0
048 H020200 0.000
048 I010200        0
048 I020200 0.000
048 J010200        0
048 J020200 0.000
048 K010200        0
048 K020200 0.000
049  000200 N
050  000200 N
051  000200 N
052  000200 N
053 A000200 Y
053 B000200 Y
053 C000200 Y
055 A000200 Y
055 B000200 N
056  000200 Y
057  000200 N
058 A000200 N
059  000200 Y
060 A000200 N
060 B000200 N
061  000200     1000
062 A000200 Y
062 B000200   0.0
062 C000200   9.7
062 D000200   0.0
062 E000200   0.0
062 F000200   0.0
062 G000200   0.0
062 H000200   0.0
062 I000200   0.0
062 J000200   0.0
062 K000200   0.0
<PAGE>      PAGE  12
062 L000200   0.0
062 M000200   0.0
062 N000200   0.0
062 O000200   0.0
062 P000200   0.0
062 Q000200  87.3
062 R000200   3.0
063 A000200   0
063 B000200 16.9
064 A000200 N
064 B000200 N
066 A000200 N
067  000200 N
068 A000200 N
068 B000200 Y
069  000200 N
070 A010200 Y
070 A020200 N
070 B010200 N
070 B020200 N
070 C010200 Y
070 C020200 N
070 D010200 N
070 D020200 N
070 E010200 Y
070 E020200 N
070 F010200 Y
070 F020200 N
070 G010200 Y
070 G020200 N
070 H010200 Y
070 H020200 N
070 I010200 N
070 I020200 N
070 J010200 Y
070 J020200 Y
070 K010200 Y
070 K020200 N
070 L010200 Y
070 L020200 Y
070 M010200 Y
070 M020200 Y
070 N010200 Y
070 N020200 N
070 O010200 Y
070 O020200 N
070 P010200 Y
070 P020200 N
070 Q010200 N
070 Q020200 N
070 R010200 Y
<PAGE>      PAGE  13
070 R020200 N
071 A000200      1371
071 B000200      1280
071 C000200       709
071 D000200  181
072 A000200  6
072 B000200       46
072 C000200        0
072 D000200        0
072 E000200        0
072 F000200        3
072 G000200        0
072 H000200        0
072 I000200        0
072 J000200        3
072 K000200        0
072 L000200        1
072 M000200        0
072 N000200        3
072 O000200        0
072 P000200        0
072 Q000200        0
072 R000200        8
072 S000200        2
072 T000200        1
072 U000200        0
072 V000200        0
072 W000200        0
072 X000200       21
072 Y000200       15
072 Z000200       40
072AA000200        0
072BB000200      198
072CC010200        8
072CC020200        0
072DD010200       56
072DD020200        1
072EE000200        0
073 A010200   0.5600
073 A020200   0.5600
073 B000200   0.0000
073 C000200   0.0000
074 A000200        8
074 B000200        0
074 C000200       80
074 D000200      719
074 E000200        0
074 F000200        0
074 G000200        0
074 H000200        0
074 I000200        0
<PAGE>      PAGE  14
074 J000200       51
074 K000200        0
074 L000200       14
074 M000200        0
074 N000200      872
074 O000200       43
074 P000200        0
074 Q000200        0
074 R010200        0
074 R020200        0
074 R030200        0
074 R040200        6
074 S000200        0
074 T000200      823
074 U010200      108
074 U020200        2
074 V010200     7.51
074 V020200     7.51
074 W000200   0.0000
074 X000200       14
074 Y000200        0
075 A000200        0
075 B000200      796
076  000200     0.00
013 A000301 ERNST & YOUNG
013 B010301 BOSTON
013 B020301 MA
013 B030301 02116
024  000300 N
028 A010300        29
028 A020300         0
028 A030300         0
028 A040300         8
028 B010300         1
028 B020300         0
028 B030300         0
028 B040300        42
028 C010300        38
028 C020300         0
028 C030300         0
028 C040300        11
028 D010300        10
028 D020300         0
028 D030300         0
028 D040300         1
028 E010300         4
028 E020300        55
028 E030300         0
028 E040300        14
028 F010300        21
028 F020300         0
<PAGE>      PAGE  15
028 F030300         0
028 F040300        22
028 G010300       103
028 G020300        55
028 G030300         0
028 G040300        98
028 H000300        19
029  000300 N
030 A000300      0
030 B000300  0.00
030 C000300  0.00
031 A000300      0
031 B000300      0
032  000300      0
033  000300      0
034  000300 N
035  000300      0
036 B000300      0
042 A000300   0
042 B000300   0
042 C000300   0
042 D000300   0
042 E000300   0
042 F000300   0
042 G000300   0
042 H000300   0
043  000300      0
044  000300      0
045  000300 Y
046  000300 N
047  000300 Y
048  000300  0.900
048 A010300        0
048 A020300 0.000
048 B010300        0
048 B020300 0.000
048 C010300        0
048 C020300 0.000
048 D010300        0
048 D020300 0.000
048 E010300        0
048 E020300 0.000
048 F010300        0
048 F020300 0.000
048 G010300        0
048 G020300 0.000
048 H010300        0
048 H020300 0.000
048 I010300        0
048 I020300 0.000
048 J010300        0
<PAGE>      PAGE  16
048 J020300 0.000
048 K010300        0
048 K020300 0.000
049  000300 N
050  000300 N
051  000300 N
052  000300 N
053 A000300 Y
053 B000300 Y
053 C000300 Y
055 A000300 N
055 B000300 N
056  000300 Y
057  000300 N
058 A000300 N
059  000300 Y
060 A000300 Y
060 B000300 Y
061  000300     1000
062 A000300 N
062 B000300   0.0
062 C000300   0.0
062 D000300   0.0
062 E000300   0.0
062 F000300   0.0
062 G000300   0.0
062 H000300   0.0
062 I000300   0.0
062 J000300   0.0
062 K000300   0.0
062 L000300   0.0
062 M000300   0.0
062 N000300   0.0
062 O000300   0.0
062 P000300   0.0
062 Q000300   0.0
062 R000300   0.0
063 A000300   0
063 B000300  0.0
066 A000300 Y
066 B000300 N
066 C000300 Y
066 D000300 N
066 E000300 N
066 F000300 N
066 G000300 N
067  000300 N
068 A000300 N
068 B000300 N
069  000300 N
070 A010300 Y
<PAGE>      PAGE  17
070 A020300 N
070 B010300 Y
070 B020300 N
070 C010300 Y
070 C020300 N
070 D010300 Y
070 D020300 N
070 E010300 Y
070 E020300 N
070 F010300 Y
070 F020300 N
070 G010300 Y
070 G020300 N
070 H010300 Y
070 H020300 N
070 I010300 N
070 I020300 N
070 J010300 Y
070 J020300 Y
070 K010300 Y
070 K020300 N
070 L010300 Y
070 L020300 Y
070 M010300 Y
070 M020300 Y
070 N010300 Y
070 N020300 N
070 O010300 Y
070 O020300 N
070 P010300 Y
070 P020300 N
070 Q010300 N
070 Q020300 N
070 R010300 Y
070 R020300 N
071 A000300       498
071 B000300       383
071 C000300       786
071 D000300   49
072 A000300  6
072 B000300        1
072 C000300        3
072 D000300        0
072 E000300        0
072 F000300        4
072 G000300        0
072 H000300        0
072 I000300        0
072 J000300        3
072 K000300        0
072 L000300        5
<PAGE>      PAGE  18
072 M000300        0
072 N000300        2
072 O000300        0
072 P000300        0
072 Q000300        0
072 R000300        7
072 S000300        1
072 T000300        1
072 U000300        0
072 V000300        0
072 W000300        0
072 X000300       23
072 Y000300       18
072 Z000300       -1
072AA000300        0
072BB000300       22
072CC010300       55
072CC020300        0
072DD010300        0
072DD020300        0
072EE000300       55
073 A010300   0.0000
073 A020300   0.0000
073 B000300   0.6000
073 C000300   0.0000
074 A000300       43
074 B000300        0
074 C000300        0
074 D000300        0
074 E000300        0
074 F000300      893
074 G000300        0
074 H000300        0
074 I000300        0
074 J000300       21
074 K000300        0
074 L000300        0
074 M000300        0
074 N000300      957
074 O000300       14
074 P000300        0
074 Q000300        0
074 R010300        0
074 R020300        0
074 R030300        0
074 R040300        2
074 S000300        0
074 T000300      941
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074 U020300       59
074 V010300     9.74
<PAGE>      PAGE  19
074 V020300     9.74
074 W000300   0.0000
074 X000300       42
074 Y000300        0
075 A000300        0
075 B000300      834
076  000300     0.00
013 A000401 ERNST & YOUNG
013 B010401 BOSTON
013 B020401 MA
013 B030401 02116
024  000400 N
028 A010400         1
028 A020400         0
028 A030400         0
028 A040400         1
028 B010400         0
028 B020400         0
028 B030400         0
028 B040400         0
028 C010400        17
028 C020400         0
028 C030400         0
028 C040400         1
028 D010400         2
028 D020400         0
028 D030400         0
028 D040400         0
028 E010400        32
028 E020400        39
028 E030400         0
028 E040400        52
028 F010400         4
028 F020400         0
028 F030400         0
028 F040400        11
028 G010400        56
028 G020400        39
028 G030400         0
028 G040400        65
028 H000400        33
029  000400 N
030 A000400      0
030 B000400  0.00
030 C000400  0.00
031 A000400      0
031 B000400      0
032  000400      0
033  000400      0
034  000400 N
035  000400      0
<PAGE>      PAGE  20
036 B000400      0
042 A000400   0
042 B000400   0
042 C000400   0
042 D000400   0
042 E000400   0
042 F000400   0
042 G000400   0
042 H000400   0
043  000400      0
044  000400      0
045  000400 Y
046  000400 N
047  000400 Y
048  000400  0.750
048 A010400        0
048 A020400 0.000
048 B010400        0
048 B020400 0.000
048 C010400        0
048 C020400 0.000
048 D010400        0
048 D020400 0.000
048 E010400        0
048 E020400 0.000
048 F010400        0
048 F020400 0.000
048 G010400        0
048 G020400 0.000
048 H010400        0
048 H020400 0.000
048 I010400        0
048 I020400 0.000
048 J010400        0
048 J020400 0.000
048 K010400        0
048 K020400 0.000
049  000400 N
050  000400 N
051  000400 N
052  000400 N
053 A000400 Y
053 B000400 Y
053 C000400 Y
055 A000400 Y
055 B000400 N
056  000400 Y
057  000400 N
058 A000400 N
059  000400 Y
060 A000400 Y
<PAGE>      PAGE  21
060 B000400 Y
061  000400     1000
062 A000400 N
062 B000400   0.0
062 C000400   0.0
062 D000400   0.0
062 E000400   0.0
062 F000400   0.0
062 G000400   0.0
062 H000400   0.0
062 I000400   0.0
062 J000400   0.0
062 K000400   0.0
062 L000400   0.0
062 M000400   0.0
062 N000400   0.0
062 O000400   0.0
062 P000400   0.0
062 Q000400   0.0
062 R000400   0.0
063 A000400   0
063 B000400  0.0
066 A000400 Y
066 B000400 N
066 C000400 Y
066 D000400 N
066 E000400 N
066 F000400 N
066 G000400 N
067  000400 N
068 A000400 N
068 B000400 N
069  000400 N
070 A010400 Y
070 A020400 N
070 B010400 N
070 B020400 N
070 C010400 Y
070 C020400 N
070 D010400 N
070 D020400 N
070 E010400 Y
070 E020400 N
070 F010400 Y
070 F020400 N
070 G010400 Y
070 G020400 N
070 H010400 Y
070 H020400 N
070 I010400 N
070 I020400 N
<PAGE>      PAGE  22
070 J010400 Y
070 J020400 Y
070 K010400 Y
070 K020400 N
070 L010400 Y
070 L020400 Y
070 M010400 Y
070 M020400 Y
070 N010400 Y
070 N020400 N
070 O010400 Y
070 O020400 N
070 P010400 Y
070 P020400 N
070 Q010400 N
070 Q020400 N
070 R010400 Y
070 R020400 N
071 A000400       450
071 B000400       499
071 C000400       744
071 D000400   61
072 A000400  6
072 B000400        0
072 C000400        6
072 D000400        0
072 E000400        0
072 F000400        3
072 G000400        0
072 H000400        0
072 I000400        0
072 J000400        3
072 K000400        0
072 L000400        1
072 M000400        0
072 N000400        2
072 O000400        0
072 P000400        0
072 Q000400        0
072 R000400        4
072 S000400        1
072 T000400        1
072 U000400        0
072 V000400        0
072 W000400        1
072 X000400       16
072 Y000400       11
072 Z000400        1
072AA000400       38
072BB000400        0
072CC010400       24
<PAGE>      PAGE  23
072CC020400        0
072DD010400        3
072DD020400        1
072EE000400       36
073 A010400   0.0400
073 A020400   0.0400
073 B000400   0.5000
073 C000400   0.0000
074 A000400       25
074 B000400        0
074 C000400        0
074 D000400        0
074 E000400        5
074 F000400      758
074 G000400        0
074 H000400        0
074 I000400        0
074 J000400       24
074 K000400        0
074 L000400        1
074 M000400        0
074 N000400      813
074 O000400        5
074 P000400        0
074 Q000400        0
074 R010400        0
074 R020400        0
074 R030400        0
074 R040400        3
074 S000400        0
074 T000400      805
074 U010400       60
074 U020400       13
074 V010400    10.96
074 V020400    10.94
074 W000400   0.0000
074 X000400       26
074 Y000400        0
075 A000400        0
075 B000400      749
076  000400     0.00
SIGNATURE   JAMES O. 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-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                        782618596
<INVESTMENTS-AT-VALUE>                       790854363
<RECEIVABLES>                                 14481844
<ASSETS-OTHER>                                    5814
<OTHER-ITEMS-ASSETS>                               707
<TOTAL-ASSETS>                               805342728
<PAYABLE-FOR-SECURITIES>                      29883598
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1339742
<TOTAL-LIABILITIES>                           31223340
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     813488545
<SHARES-COMMON-STOCK>                         99485390
<SHARES-COMMON-PRIOR>                         98097509
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<APPREC-INCREASE-CURRENT>                      6920433
<NET-CHANGE-FROM-OPS>                         25035682
<EQUALIZATION>                                       0
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<OVERDISTRIB-NII-PRIOR>                       (184277)
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<GROSS-ADVISORY-FEES>                          1801985
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                4447389
<AVERAGE-NET-ASSETS>                         793673314
<PER-SHARE-NAV-BEGIN>                             6.69
<PER-SHARE-NII>                                   0.37
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<EXPENSE-RATIO>                                   0.94
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</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
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                        782618596
<INVESTMENTS-AT-VALUE>                       790854363
<RECEIVABLES>                                 14481844
<ASSETS-OTHER>                                    5814
<OTHER-ITEMS-ASSETS>                               707
<TOTAL-ASSETS>                               805342728
<PAYABLE-FOR-SECURITIES>                      29883598
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1339742
<TOTAL-LIABILITIES>                           31223340
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     813488545
<SHARES-COMMON-STOCK>                         15881042
<SHARES-COMMON-PRIOR>                         23190632
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<EXPENSES-NET>                               (4199390)
<NET-INVESTMENT-INCOME>                       23023286
<REALIZED-GAINS-CURRENT>                     (4908037)
<APPREC-INCREASE-CURRENT>                      6920433
<NET-CHANGE-FROM-OPS>                         25035682
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                    (3885460)
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<NUMBER-OF-SHARES-REDEEMED>                  (8857180)
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<OVERDISTRIB-NII-PRIOR>                       (184277)
<OVERDIST-NET-GAINS-PRIOR>                  (42192909)
<GROSS-ADVISORY-FEES>                          1801985
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                4447389
<AVERAGE-NET-ASSETS>                         793673314
<PER-SHARE-NAV-BEGIN>                             6.70
<PER-SHARE-NII>                                   0.35
<PER-SHARE-GAIN-APPREC>                         (0.15)
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<PER-SHARE-NAV-END>                               6.72
<EXPENSE-RATIO>                                   1.69
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 013
   <NAME> MFS GOVERNMENT MORTGAGE FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                        782618596
<INVESTMENTS-AT-VALUE>                       790854363
<RECEIVABLES>                                 14481844
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<OTHER-ITEMS-ASSETS>                               707
<TOTAL-ASSETS>                               805342728
<PAYABLE-FOR-SECURITIES>                      29883598
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1339742
<TOTAL-LIABILITIES>                           31223340
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                     813488545
<SHARES-COMMON-STOCK>                             9027
<SHARES-COMMON-PRIOR>                             7649
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<NET-INVESTMENT-INCOME>                       23023286
<REALIZED-GAINS-CURRENT>                     (4908037)
<APPREC-INCREASE-CURRENT>                      6920433
<NET-CHANGE-FROM-OPS>                         25035682
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1583)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                             (11)
<NUMBER-OF-SHARES-SOLD>                           1892
<NUMBER-OF-SHARES-REDEEMED>                      (753)
<SHARES-REINVESTED>                                239
<NET-CHANGE-IN-ASSETS>                      (37990099)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                       (184277)
<OVERDIST-NET-GAINS-PRIOR>                  (42192909)
<GROSS-ADVISORY-FEES>                          1801985
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                4447389
<AVERAGE-NET-ASSETS>                         793673314
<PER-SHARE-NAV-BEGIN>                             6.69
<PER-SHARE-NII>                                   0.37
<PER-SHARE-GAIN-APPREC>                         (0.15)
<PER-SHARE-DIVIDEND>                            (0.21)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               6.70
<EXPENSE-RATIO>                                   0.69
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME>  SERIES TRUST X
<SERIES>
   <NUMBER> 021
   <NAME> EMERGING MARKETS DEBT FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                              AUG-1-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           851795
<INVESTMENTS-AT-VALUE>                          799116
<RECEIVABLES>                                    64800
<ASSETS-OTHER>                                       0 
<OTHER-ITEMS-ASSETS>                              7967
<TOTAL-ASSETS>                                  871883
<PAYABLE-FOR-SECURITIES>                         43310
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         5163
<TOTAL-LIABILITIES>                              48473
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1072545
<SHARES-COMMON-STOCK>                           107964
<SHARES-COMMON-PRIOR>                           100021
<ACCUMULATED-NII-CURRENT>                         9171
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0  
<OVERDISTRIBUTION-GAINS>                      (201182)
<ACCUM-APPREC-OR-DEPREC>                       (57124)
<NET-ASSETS>                                    823410
<DIVIDEND-INCOME>                                    0
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<REALIZED-GAINS-CURRENT>                      (197636)
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<NET-CHANGE-FROM-OPS>                         (150262)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                      (56343)
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                            411
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                               7532
<NET-CHANGE-IN-ASSETS>                        (136335)
<ACCUMULATED-NII-PRIOR>                          26483
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                      (3546)
<GROSS-ADVISORY-FEES>                             3410
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  21214
<AVERAGE-NET-ASSETS>                            789373 
<PER-SHARE-NAV-BEGIN>                             9.58
<PER-SHARE-NII>                                   0.39
<PER-SHARE-GAIN-APPREC>                         (1.90)
<PER-SHARE-DIVIDEND>                            (0.56)
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.51
<EXPENSE-RATIO>                                   1.70
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME>  SERIES TRUST X
<SERIES>
   <NUMBER> 022
   <NAME> EMERGING MARKETS DEBT FUND
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                              AUG-1-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           851795
<INVESTMENTS-AT-VALUE>                          799116
<RECEIVABLES>                                    64800
<ASSETS-OTHER>                                       0 
<OTHER-ITEMS-ASSETS>                              7967
<TOTAL-ASSETS>                                  871883
<PAYABLE-FOR-SECURITIES>                         43310
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         5163
<TOTAL-LIABILITIES>                              48473
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1072545
<SHARES-COMMON-STOCK>                             1621
<SHARES-COMMON-PRIOR>                              126
<ACCUMULATED-NII-CURRENT>                         9171
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                              0  
<OVERDISTRIBUTION-GAINS>                      (201182)
<ACCUM-APPREC-OR-DEPREC>                       (57124)
<NET-ASSETS>                                    823410
<DIVIDEND-INCOME>                                    0
<INTEREST-INCOME>                                46477
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                  (6632)
<NET-INVESTMENT-INCOME>                          39845
<REALIZED-GAINS-CURRENT>                      (197636)
<APPREC-INCREASE-CURRENT>                         7529
<NET-CHANGE-FROM-OPS>                         (150262)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (814)
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1387
<NUMBER-OF-SHARES-REDEEMED>                          0
<SHARES-REINVESTED>                                108
<NET-CHANGE-IN-ASSETS>                        (136335)
<ACCUMULATED-NII-PRIOR>                          26483
<ACCUMULATED-GAINS-PRIOR>                            0
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<OVERDIST-NET-GAINS-PRIOR>                      (3546)
<GROSS-ADVISORY-FEES>                             3410
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  21214
<AVERAGE-NET-ASSETS>                              6619 
<PER-SHARE-NAV-BEGIN>                             9.58
<PER-SHARE-NII>                                   0.36
<PER-SHARE-GAIN-APPREC>                         (1.87)
<PER-SHARE-DIVIDEND>                            (0.56)
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               7.51
<EXPENSE-RATIO>                                   1.70
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 031
   <NAME> MFS SMALL CAP VALUE FUND - CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           895683
<INVESTMENTS-AT-VALUE>                          893444
<RECEIVABLES>                                    20446
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                             42680
<TOTAL-ASSETS>                                  956570
<PAYABLE-FOR-SECURITIES>                         13975
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2075
<TOTAL-LIABILITIES>                              16050
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        966492
<SHARES-COMMON-STOCK>                            37250
<SHARES-COMMON-PRIOR>                            41760
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (1318)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (22406)
<ACCUM-APPREC-OR-DEPREC>                        (2248)
<NET-ASSETS>                                    940520
<DIVIDEND-INCOME>                                 2945
<INTEREST-INCOME>                                 1252
<OTHER-INCOME>                                    (34)
<EXPENSES-NET>                                  (5481)
<NET-INVESTMENT-INCOME>                         (1318)
<REALIZED-GAINS-CURRENT>                       (22232)
<APPREC-INCREASE-CURRENT>                        55234
<NET-CHANGE-FROM-OPS>                            31684
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (110)
<DISTRIBUTIONS-OF-GAINS>                       (21973)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           2159
<NUMBER-OF-SHARES-REDEEMED>                     (9130)
<SHARES-REINVESTED>                               2461
<NET-CHANGE-IN-ASSETS>                           36457
<ACCUMULATED-NII-PRIOR>                            277
<ACCUMULATED-GAINS-PRIOR>                        55038
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             3795
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  23143
<AVERAGE-NET-ASSETS>                            834016
<PER-SHARE-NAV-BEGIN>                            10.02
<PER-SHARE-NII>                                 (0.01)
<PER-SHARE-GAIN-APPREC>                           0.33
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (0.60)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.74
<EXPENSE-RATIO>                                   1.33
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 032
   <NAME> MFS SMALL CAP VALUE FUND - CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           895683
<INVESTMENTS-AT-VALUE>                          893444
<RECEIVABLES>                                    20446
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                             42680
<TOTAL-ASSETS>                                  956570
<PAYABLE-FOR-SECURITIES>                         13975
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2075
<TOTAL-LIABILITIES>                              16050
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        966492
<SHARES-COMMON-STOCK>                            59315
<SHARES-COMMON-PRIOR>                            48489
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (1318)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                       (22406)
<ACCUM-APPREC-OR-DEPREC>                        (2248)
<NET-ASSETS>                                    940520
<DIVIDEND-INCOME>                                 2945
<INTEREST-INCOME>                                 1252
<OTHER-INCOME>                                    (34)
<EXPENSES-NET>                                  (5481)
<NET-INVESTMENT-INCOME>                         (1318)
<REALIZED-GAINS-CURRENT>                       (22232)
<APPREC-INCREASE-CURRENT>                        55234
<NET-CHANGE-FROM-OPS>                            31684
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (167)
<DISTRIBUTIONS-OF-GAINS>                       (33239)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           9138
<NUMBER-OF-SHARES-REDEEMED>                     (2040)
<SHARES-REINVESTED>                               3728
<NET-CHANGE-IN-ASSETS>                           36457
<ACCUMULATED-NII-PRIOR>                            277
<ACCUMULATED-GAINS-PRIOR>                        55038
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             3795
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  23143
<AVERAGE-NET-ASSETS>                            834016
<PER-SHARE-NAV-BEGIN>                            10.02
<PER-SHARE-NII>                                 (0.01)
<PER-SHARE-GAIN-APPREC>                           0.33
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                       (0.60)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                               9.74
<EXPENSE-RATIO>                                   1.33
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        

</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 041
   <NAME> MFS STRATEGIC VALUE FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           738958
<INVESTMENTS-AT-VALUE>                          762377
<RECEIVABLES>                                    25089
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                             25191
<TOTAL-ASSETS>                                  812657
<PAYABLE-FOR-SECURITIES>                          5250
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2231
<TOTAL-LIABILITIES>                               7481
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        742366
<SHARES-COMMON-STOCK>                            60083
<SHARES-COMMON-PRIOR>                            54888
<ACCUMULATED-NII-CURRENT>                         1188
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          38206
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         23416
<NET-ASSETS>                                    805176
<DIVIDEND-INCOME>                                 6005
<INTEREST-INCOME>                                   74
<OTHER-INCOME>                                    (17)
<EXPENSES-NET>                                  (4735)
<NET-INVESTMENT-INCOME>                           1327
<REALIZED-GAINS-CURRENT>                         38409
<APPREC-INCREASE-CURRENT>                        23612
<NET-CHANGE-FROM-OPS>                            63348
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (2574)
<DISTRIBUTIONS-OF-GAINS>                       (28888)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           2990
<NUMBER-OF-SHARES-REDEEMED>                      (777)
<SHARES-REINVESTED>                               2982
<NET-CHANGE-IN-ASSETS>                           54288
<ACCUMULATED-NII-PRIOR>                           3050
<ACCUMULATED-GAINS-PRIOR>                        35588
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             2839
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  15914
<AVERAGE-NET-ASSETS>                            749298
<PER-SHARE-NAV-BEGIN>                            10.66
<PER-SHARE-NII>                                   0.02
<PER-SHARE-GAIN-APPREC>                           0.82
<PER-SHARE-DIVIDEND>                            (0.04)
<PER-SHARE-DISTRIBUTIONS>                       (0.50)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.96
<EXPENSE-RATIO>                                   1.27
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 042
   <NAME> MFS STRATEGIC VALUE FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          JUL-31-1999
<PERIOD-START>                             AUG-01-1998
<PERIOD-END>                               JAN-31-1999
<INVESTMENTS-AT-COST>                           738958
<INVESTMENTS-AT-VALUE>                          762377
<RECEIVABLES>                                    25089
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                             25191
<TOTAL-ASSETS>                                  812657
<PAYABLE-FOR-SECURITIES>                          5250
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                         2231
<TOTAL-LIABILITIES>                               7481
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                        742366
<SHARES-COMMON-STOCK>                            13425
<SHARES-COMMON-PRIOR>                            15547
<ACCUMULATED-NII-CURRENT>                         1188
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                          38206
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                         23416
<NET-ASSETS>                                    805176
<DIVIDEND-INCOME>                                 6005
<INTEREST-INCOME>                                   74
<OTHER-INCOME>                                    (17)
<EXPENSES-NET>                                  (4735)
<NET-INVESTMENT-INCOME>                           1327
<REALIZED-GAINS-CURRENT>                         38409
<APPREC-INCREASE-CURRENT>                        23612
<NET-CHANGE-FROM-OPS>                            63348
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                        (615)
<DISTRIBUTIONS-OF-GAINS>                        (6903)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           2328
<NUMBER-OF-SHARES-REDEEMED>                     (5163)
<SHARES-REINVESTED>                                713
<NET-CHANGE-IN-ASSETS>                           54288
<ACCUMULATED-NII-PRIOR>                           3050
<ACCUMULATED-GAINS-PRIOR>                        35588
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                             2839
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                  15914
<AVERAGE-NET-ASSETS>                            749298
<PER-SHARE-NAV-BEGIN>                            10.65
<PER-SHARE-NII>                                   0.02
<PER-SHARE-GAIN-APPREC>                           0.81
<PER-SHARE-DIVIDEND>                            (0.04)
<PER-SHARE-DISTRIBUTIONS>                       (0.50)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              10.94
<EXPENSE-RATIO>                                   1.27
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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