MFS SERIES TRUST X
NSAR-A, 1999-01-28
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<PAGE>      PAGE  1
000 A000000 11/30/98
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 U
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  3
007 C010100  1
007 C010200  2
007 C020200 MFS INTERNATIONAL GROWTH AND INCOME FUND
007 C030200 N
007 C010300  3
007 C020300 MFS INTERNATIONAL GROWTH FUND
007 C030300 N
007 C010400  4
007 C020400 MFS/F&C EMERGING MARKETS EQUITY FUND
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
020 A000001 MERRILL LYNCH
020 B000001 13-5674085
020 C000001     54
020 A000002 ROBERT FLEMING
020 B000002 13-3298866
020 C000002     35
020 A000003 SBC WARBURG
020 B000003 00-0000000
020 C000003     29
020 A000004 MORGAN STANLEY
020 B000004 00-0000000
020 C000004     28
020 A000005 GOLDMAN SACHS
<PAGE>      PAGE  2
020 B000005 13-5108880
020 C000005     28
020 A000006 ING BARING
020 B000006 00-0000000
020 C000006     26
020 A000007 CREDIT LYONAISE
020 B000007 00-0000000
020 C000007     20
020 A000008 SALOMON BROTHERS
020 B000008 13-3082694
020 C000008     19
020 A000009 HOARE GOVETT
020 B000009 00-0000000
020 C000009     16
020 A000010 DRESDNER
020 B000010 00-0000000
020 C000010     14
021  000000      450
022 A000001 CARROLL MCENTEE
022 B000001 13-2650700
022 C000001    194020
022 D000001      1697
022 A000002 PRUDENTIAL SECURITIES
022 B000002 22-2347336
022 C000002     87182
022 D000002       800
022 A000003 GENERAL ELECTRIC CAPITAL CORP
022 B000003 06-1109503
022 C000003     87262
022 D000003         0
022 A000004 NATIONS BANK
022 B000004 75-0520130
022 C000004     86938
022 D000004         0
022 A000005 CHASE SECURITIES
022 B000005 13-3112953
022 C000005     57684
022 D000005         0
022 A000006 ASSOC CORP
022 B000006 00-0000000
022 C000006     54503
022 D000006         0
022 A000007 FORD MOTOR CREDIT CORP
022 B000007 38-1612444
022 C000007     48989
022 D000007         0
022 A000008 CS FIRST BOSTON
022 B000008 13-5659485
022 C000008     48300
022 D000008         0
022 A000009 BANK BOSTON
<PAGE>      PAGE  3
022 B000009 00-0000000
022 C000009     46080
022 D000009         0
022 A000010 SMITH BARNEY
022 B000010 00-0000000
022 C000010     15676
022 D000010      2657
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023 D000000      27153
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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
055 A00AA00 Y
055 B00AA00 N
056  00AA00 Y
057  00AA00 N
058 A00AA00 N
059  00AA00 Y
060 A00AA00 Y
060 B00AA00 Y
061  00AA00     1000
062 A00AA00 N
062 B00AA00   0.0
062 C00AA00   0.0
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<PAGE>      PAGE  4
062 J00AA00   0.0
062 K00AA00   0.0
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062 Q00AA00   0.0
062 R00AA00   0.0
077 A000000 N
078  000000 N
080 A00AA00 NATIONAL UNION INSURANCE CO.
080 B00AA00 FEDERAL INS.
080 C00AA00    75000
081 A00AA00 Y
081 B00AA00 116
082 A00AA00 Y
082 B00AA00      100
083 A00AA00 N
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084 A00AA00 Y
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024  000200 N
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<PAGE>      PAGE  5
028 B020200         0
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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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<PAGE>      PAGE  6
063 A000200   0
063 B000200  0.0
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<PAGE>      PAGE  7
074 I000200        0
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074 W000200   0.0000
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076  000200     0.00
024  000300 N
025 A000301 DELETE
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028 A020300         0
028 A030300         0
028 A040300      9645
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<PAGE>      PAGE  8
028 E010300     27437
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036 A000300 N
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037  000300 N
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039  000300 N
040  000300 Y
041  000300 Y
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042 D000300  38
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071 A000300     52995
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<PAGE>      PAGE  9
072 H000300        0
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073 A010300   0.0000
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073 B000300   0.0000
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<PAGE>      PAGE  10
074 S000300        0
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074 V010300    15.51
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074 W000300   0.0000
074 X000300    16183
074 Y000300        0
075 A000300        0
075 B000300   101955
076  000300     0.00
024  000400 N
028 A010400      6991
028 A020400         0
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028 A040400      5547
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<PAGE>      PAGE  11
035  000400     49
036 A000400 N
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042 D000400  42
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047  000400 Y
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048 A010400   500000
048 A020400 0.975
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048 C010400        0
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048 K020400 0.925
071 A000400     32658
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<PAGE>      PAGE  12
072 D000400        0
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073 A010400   0.0000
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<PAGE>      PAGE  13
074 R010400        0
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074 V010400    12.42
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075 B000400    64004
076  000400     0.00
SIGNATURE   MARK E. BRADLEY                              
TITLE       ASSISTANT TREASURER 
 

WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 041
   <NAME> MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         65631901
<INVESTMENTS-AT-VALUE>                        57851410
<RECEIVABLES>                                  2191654
<ASSETS-OTHER>                                   15632
<OTHER-ITEMS-ASSETS>                            912501
<TOTAL-ASSETS>                                60971197
<PAYABLE-FOR-SECURITIES>                       1768399
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1774193
<TOTAL-LIABILITIES>                            3542592
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      80932342
<SHARES-COMMON-STOCK>                          2188827
<SHARES-COMMON-PRIOR>                          2283376
<ACCUMULATED-NII-CURRENT>                            0
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<DIVIDEND-INCOME>                               880132
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<OTHER-INCOME>                                 (53287)
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<REALIZED-GAINS-CURRENT>                    (15518003)
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<NET-CHANGE-FROM-OPS>                       (17622550)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
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<NUMBER-OF-SHARES-SOLD>                        3219118
<NUMBER-OF-SHARES-REDEEMED>                  (3313667)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (23124665)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                       (152729)
<OVERDIST-NET-GAINS-PRIOR>                     (98625)
<GROSS-ADVISORY-FEES>                         (399392)
<INTEREST-EXPENSE>                              (2871)
<GROSS-EXPENSE>                               (855838)
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<PER-SHARE-NAV-BEGIN>                            16.06
<PER-SHARE-NII>                                   0.03
<PER-SHARE-GAIN-APPREC>                         (3.67)
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.42
<EXPENSE-RATIO>                                   2.41
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 041
   <NAME> MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         65631901
<INVESTMENTS-AT-VALUE>                        57851410
<RECEIVABLES>                                  2191654
<ASSETS-OTHER>                                   15632
<OTHER-ITEMS-ASSETS>                            912501
<TOTAL-ASSETS>                                60971197
<PAYABLE-FOR-SECURITIES>                       1768399
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1774193
<TOTAL-LIABILITIES>                            3542592
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      80932342
<SHARES-COMMON-STOCK>                          2210835
<SHARES-COMMON-PRIOR>                          2499210
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (104037)
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<OVERDISTRIBUTION-GAINS>                    (15616628)
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<NET-ASSETS>                                  57428605
<DIVIDEND-INCOME>                               880132
<INTEREST-INCOME>                                69412
<OTHER-INCOME>                                 (53287)
<EXPENSES-NET>                                (847565)
<NET-INVESTMENT-INCOME>                          48692
<REALIZED-GAINS-CURRENT>                    (15518003)
<APPREC-INCREASE-CURRENT>                    (2153239)
<NET-CHANGE-FROM-OPS>                       (17622550)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         630339
<NUMBER-OF-SHARES-REDEEMED>                   (918714)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (23124665)
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<OVERDISTRIB-NII-PRIOR>                       (152729)
<OVERDIST-NET-GAINS-PRIOR>                     (98625)
<GROSS-ADVISORY-FEES>                         (399392)
<INTEREST-EXPENSE>                              (2871)
<GROSS-EXPENSE>                               (855838)
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<PER-SHARE-NAV-BEGIN>                            16.00
<PER-SHARE-NII>                                   0.00
<PER-SHARE-GAIN-APPREC>                         (3.66)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.34
<EXPENSE-RATIO>                                   2.90
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                              0.00
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 041
   <NAME> MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         65631901
<INVESTMENTS-AT-VALUE>                        57851410
<RECEIVABLES>                                  2191654
<ASSETS-OTHER>                                   15632
<OTHER-ITEMS-ASSETS>                            912501
<TOTAL-ASSETS>                                60971197
<PAYABLE-FOR-SECURITIES>                       1768399
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1774193
<TOTAL-LIABILITIES>                            3542592
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      80932342
<SHARES-COMMON-STOCK>                           210510
<SHARES-COMMON-PRIOR>                           219048
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (104037)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                    (15616628)
<ACCUM-APPREC-OR-DEPREC>                     (7783072)
<NET-ASSETS>                                  57428605
<DIVIDEND-INCOME>                               880132
<INTEREST-INCOME>                                69412
<OTHER-INCOME>                                 (53287)
<EXPENSES-NET>                                (847565)
<NET-INVESTMENT-INCOME>                          48692
<REALIZED-GAINS-CURRENT>                    (15518003)
<APPREC-INCREASE-CURRENT>                    (2153239)
<NET-CHANGE-FROM-OPS>                       (17622550)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         233937
<NUMBER-OF-SHARES-REDEEMED>                   (242475)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (23124665)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                       (152729)
<OVERDIST-NET-GAINS-PRIOR>                     (98625)
<GROSS-ADVISORY-FEES>                         (399392)
<INTEREST-EXPENSE>                              (2871)
<GROSS-EXPENSE>                               (855838)
<AVERAGE-NET-ASSETS>                           2719047
<PER-SHARE-NAV-BEGIN>                            15.88
<PER-SHARE-NII>                                 (0.01)
<PER-SHARE-GAIN-APPREC>                         (3.60)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.27
<EXPENSE-RATIO>                                   2.91
<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> 041
   <NAME> MFS/FOREIGN & COLONIAL EMERGING MARKETS EQUITY FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         65631901
<INVESTMENTS-AT-VALUE>                        57851410
<RECEIVABLES>                                  2191654
<ASSETS-OTHER>                                   15632
<OTHER-ITEMS-ASSETS>                            912501
<TOTAL-ASSETS>                                60971197
<PAYABLE-FOR-SECURITIES>                       1768399
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      1774193
<TOTAL-LIABILITIES>                            3542592
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      80932342
<SHARES-COMMON-STOCK>                            30519
<SHARES-COMMON-PRIOR>                            26553
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                        (104037)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                    (15616628)
<ACCUM-APPREC-OR-DEPREC>                     (7783072)
<NET-ASSETS>                                  57428605
<DIVIDEND-INCOME>                               880132
<INTEREST-INCOME>                                69412
<OTHER-INCOME>                                 (53287)
<EXPENSES-NET>                                (847565)
<NET-INVESTMENT-INCOME>                          48692
<REALIZED-GAINS-CURRENT>                    (15518003)
<APPREC-INCREASE-CURRENT>                    (2153239)
<NET-CHANGE-FROM-OPS>                       (17622550)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           6486
<NUMBER-OF-SHARES-REDEEMED>                     (2520)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (23124665)
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                       (152729)
<OVERDIST-NET-GAINS-PRIOR>                     (98625)
<GROSS-ADVISORY-FEES>                         (399392)
<INTEREST-EXPENSE>                              (2871)
<GROSS-EXPENSE>                               (855838)
<AVERAGE-NET-ASSETS>                            362650
<PER-SHARE-NAV-BEGIN>                            16.11
<PER-SHARE-NII>                                   0.06
<PER-SHARE-GAIN-APPREC>                         (3.68)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              12.49
<EXPENSE-RATIO>                                   1.91
<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 INTERNATIONAL GROWTH FUND - CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         90197565
<INVESTMENTS-AT-VALUE>                        98697162
<RECEIVABLES>                                  3055803
<ASSETS-OTHER>                                     752
<OTHER-ITEMS-ASSETS>                            692288
<TOTAL-ASSETS>                               102446005
<PAYABLE-FOR-SECURITIES>                       1342663
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4088869
<TOTAL-LIABILITIES>                            5431532
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      97680051
<SHARES-COMMON-STOCK>                          2903987
<SHARES-COMMON-PRIOR>                          3017836
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (34000)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (9105280)
<ACCUM-APPREC-OR-DEPREC>                       8473702
<NET-ASSETS>                                  97014473
<DIVIDEND-INCOME>                               981892
<INTEREST-INCOME>                               118536
<OTHER-INCOME>                                 (97680)
<EXPENSES-NET>                               (1152969)
<NET-INVESTMENT-INCOME>                       (150221)
<REALIZED-GAINS-CURRENT>                    (11255105)
<APPREC-INCREASE-CURRENT>                    (2951026)
<NET-CHANGE-FROM-OPS>                       (14356352)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                        5314831
<NUMBER-OF-SHARES-REDEEMED>                  (5428684)
<SHARES-REINVESTED>                                  4
<NET-CHANGE-IN-ASSETS>                      (19233959)
<ACCUMULATED-NII-PRIOR>                         116221
<ACCUMULATED-GAINS-PRIOR>                      2149825
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           497255
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1162990
<AVERAGE-NET-ASSETS>                         101955408
<PER-SHARE-NAV-BEGIN>                            17.78
<PER-SHARE-NII>                                      0
<PER-SHARE-GAIN-APPREC>                         (2.27)
<PER-SHARE-DIVIDEND>                                 0
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<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.51
<EXPENSE-RATIO>                                   1.95
<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 INTERNATIONAL GROWTH FUND - CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         90197565
<INVESTMENTS-AT-VALUE>                        98697162
<RECEIVABLES>                                  3055803
<ASSETS-OTHER>                                     752
<OTHER-ITEMS-ASSETS>                            692288
<TOTAL-ASSETS>                               102446005
<PAYABLE-FOR-SECURITIES>                       1342663
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4088869
<TOTAL-LIABILITIES>                            5431532
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      97680051
<SHARES-COMMON-STOCK>                          3118461
<SHARES-COMMON-PRIOR>                          3334903
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (34000)
<ACCUMULATED-NET-GAINS>                              0
<OVERDISTRIBUTION-GAINS>                     (9105280)
<ACCUM-APPREC-OR-DEPREC>                       8473702
<NET-ASSETS>                                  97014473
<DIVIDEND-INCOME>                               981892
<INTEREST-INCOME>                               118536
<OTHER-INCOME>                                 (97680)
<EXPENSES-NET>                               (1152969)
<NET-INVESTMENT-INCOME>                       (150221)
<REALIZED-GAINS-CURRENT>                    (11255105)
<APPREC-INCREASE-CURRENT>                    (2951026)
<NET-CHANGE-FROM-OPS>                       (14356352)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         724448
<NUMBER-OF-SHARES-REDEEMED>                   (940890)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (19233959)
<ACCUMULATED-NII-PRIOR>                         116221
<ACCUMULATED-GAINS-PRIOR>                      2149825
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           497255
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1162990
<AVERAGE-NET-ASSETS>                         101955408
<PER-SHARE-NAV-BEGIN>                            17.71
<PER-SHARE-NII>                                 (0.04)
<PER-SHARE-GAIN-APPREC>                         (2.27)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.40
<EXPENSE-RATIO>                                   2.44
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 033
   <NAME> MFS INTERNATIONAL GROWTH FUND - CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         90197565
<INVESTMENTS-AT-VALUE>                        98697162
<RECEIVABLES>                                  3055803
<ASSETS-OTHER>                                     752
<OTHER-ITEMS-ASSETS>                            692288
<TOTAL-ASSETS>                               102446005
<PAYABLE-FOR-SECURITIES>                       1342663
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4088869
<TOTAL-LIABILITIES>                            5431532
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      97680051
<SHARES-COMMON-STOCK>                           251943
<SHARES-COMMON-PRIOR>                           191894
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (34000)
<ACCUMULATED-NET-GAINS>                              0                                                    
OVERDISTRIBUTION-GAINS>                      (9105280)
<ACCUM-APPREC-OR-DEPREC>                       8473702
<NET-ASSETS>                                  97014473
<DIVIDEND-INCOME>                               981892
<INTEREST-INCOME>                               118536
<OTHER-INCOME>                                 (97680)
<EXPENSES-NET>                               (1152969)
<NET-INVESTMENT-INCOME>                       (150221)
<REALIZED-GAINS-CURRENT>                    (11255105)
<APPREC-INCREASE-CURRENT>                    (2951026)
<NET-CHANGE-FROM-OPS>                       (14356352)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         701641
<NUMBER-OF-SHARES-REDEEMED>                   (641592)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (19233959)
<ACCUMULATED-NII-PRIOR>                         116221
<ACCUMULATED-GAINS-PRIOR>                      2149825
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           497255
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1162990
<AVERAGE-NET-ASSETS>                         101955408
<PER-SHARE-NAV-BEGIN>                            17.62
<PER-SHARE-NII>                                 (0.04)
<PER-SHARE-GAIN-APPREC>                         (2.26)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.32
<EXPENSE-RATIO>                                   2.44
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>
WARNING: THE EDGAR SYSTEM ENCOUNTERED ERROR(S) WHILE PROCESSING THIS SCHEDULE.

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 034
   <NAME> MFS INTERNATIONAL GROWTH FUND - CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         90197565
<INVESTMENTS-AT-VALUE>                        98697162
<RECEIVABLES>                                  3055803
<ASSETS-OTHER>                                     752
<OTHER-ITEMS-ASSETS>                            692288
<TOTAL-ASSETS>                               102446005
<PAYABLE-FOR-SECURITIES>                       1342663
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      4088869
<TOTAL-LIABILITIES>                            5431532
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      97680051
<SHARES-COMMON-STOCK>                             7248
<SHARES-COMMON-PRIOR>                             8684
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                         (34000)
<ACCUMULATED-NET-GAINS>                              0
OVERDISTRIBUTION-GAINS>                      (9105280)
<ACCUM-APPREC-OR-DEPREC>                       8473702
<NET-ASSETS>                                  97014473
<DIVIDEND-INCOME>                               981892
<INTEREST-INCOME>                               118536
<OTHER-INCOME>                                 (97680)
<EXPENSES-NET>                               (1152969)
<NET-INVESTMENT-INCOME>                       (150221)
<REALIZED-GAINS-CURRENT>                    (11255105)
<APPREC-INCREASE-CURRENT>                    (2951026)
<NET-CHANGE-FROM-OPS>                       (14356352)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                            930
<NUMBER-OF-SHARES-REDEEMED>                     (2366)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                      (19233959)
<ACCUMULATED-NII-PRIOR>                         116221
<ACCUMULATED-GAINS-PRIOR>                      2149825
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           497255
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                1162990
<AVERAGE-NET-ASSETS>                         101955408
<PER-SHARE-NAV-BEGIN>                            17.81
<PER-SHARE-NII>                                   0.04
<PER-SHARE-GAIN-APPREC>                         (2.28)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              15.57
<EXPENSE-RATIO>                                   1.44
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 021
   <NAME> MFS INTERNATIONAL GROWTH AND INCOME FUND CLASS A
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         35425987
<INVESTMENTS-AT-VALUE>                        40342579
<RECEIVABLES>                                   575755
<ASSETS-OTHER>                                   33806
<OTHER-ITEMS-ASSETS>                             17980
<TOTAL-ASSETS>                                40970120
<PAYABLE-FOR-SECURITIES>                        152217
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       219815
<TOTAL-LIABILITIES>                             372032
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      34905050
<SHARES-COMMON-STOCK>                           894630
<SHARES-COMMON-PRIOR>                           793486
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (88058)
<ACCUMULATED-NET-GAINS>                         862995
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       4918101
<NET-ASSETS>                                  40598088
<DIVIDEND-INCOME>                               345917
<INTEREST-INCOME>                                57298
<OTHER-INCOME>                                  (33244)
<EXPENSES-NET>                                  442387
<NET-INVESTMENT-INCOME>                         (72416)
<REALIZED-GAINS-CURRENT>                        186841
<APPREC-INCREASE-CURRENT>                      (770009)
<NET-CHANGE-FROM-OPS>                          (655584)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         690215
<NUMBER-OF-SHARES-REDEEMED>                    (589071)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         5694002
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       676154
<OVERDISTRIB-NII-PRIOR>                         (15642)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           179135
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 444393
<AVERAGE-NET-ASSETS>                          15385604
<PER-SHARE-NAV-BEGIN>                            19.01
<PER-SHARE-NII>                                  (0.01)
<PER-SHARE-GAIN-APPREC>                          (0.39)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.61
<EXPENSE-RATIO>                                   2.13
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 022
   <NAME> MFS INTERNATIONAL GROWTH AND INCOME FUND CLASS B
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         35425987
<INVESTMENTS-AT-VALUE>                        40342579
<RECEIVABLES>                                   575755
<ASSETS-OTHER>                                   33806
<OTHER-ITEMS-ASSETS>                             17980
<TOTAL-ASSETS>                                40970120
<PAYABLE-FOR-SECURITIES>                        152217
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       219815
<TOTAL-LIABILITIES>                             372032
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      34905050
<SHARES-COMMON-STOCK>                          1206185
<SHARES-COMMON-PRIOR>                          1001476
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (88058)
<ACCUMULATED-NET-GAINS>                         862995
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       4918101
<NET-ASSETS>                                  40598088
<DIVIDEND-INCOME>                               345917
<INTEREST-INCOME>                                57298
<OTHER-INCOME>                                  (33244)
<EXPENSES-NET>                                  442387
<NET-INVESTMENT-INCOME>                         (72416)
<REALIZED-GAINS-CURRENT>                        186841
<APPREC-INCREASE-CURRENT>                      (770009)
<NET-CHANGE-FROM-OPS>                          (655584)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         570976
<NUMBER-OF-SHARES-REDEEMED>                    (366267)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         5694002
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       676154
<OVERDISTRIB-NII-PRIOR>                         (15642)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           179135
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 444393
<AVERAGE-NET-ASSETS>                          19881291
<PER-SHARE-NAV-BEGIN>                            18.96
<PER-SHARE-NII>                                  (0.05)
<PER-SHARE-GAIN-APPREC>                          (0.40)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.51
<EXPENSE-RATIO>                                   2.63
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 023
   <NAME> MFS INTERNATIONAL GROWTH AND INCOME FUND CLASS C
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         35425987
<INVESTMENTS-AT-VALUE>                        40342579
<RECEIVABLES>                                   575755
<ASSETS-OTHER>                                   33806
<OTHER-ITEMS-ASSETS>                             17980
<TOTAL-ASSETS>                                40970120
<PAYABLE-FOR-SECURITIES>                        152217
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       219815
<TOTAL-LIABILITIES>                             372032
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      34905050
<SHARES-COMMON-STOCK>                            86221
<SHARES-COMMON-PRIOR>                            43821
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (88058)
<ACCUMULATED-NET-GAINS>                         862995
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       4918101
<NET-ASSETS>                                  40598088
<DIVIDEND-INCOME>                               345917
<INTEREST-INCOME>                                57298
<OTHER-INCOME>                                  (33244)
<EXPENSES-NET>                                  442387
<NET-INVESTMENT-INCOME>                         (72416)
<REALIZED-GAINS-CURRENT>                        186841
<APPREC-INCREASE-CURRENT>                      (770009)
<NET-CHANGE-FROM-OPS>                          (655584)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         149934
<NUMBER-OF-SHARES-REDEEMED>                    (107534)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         5694002
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       676154
<OVERDISTRIB-NII-PRIOR>                         (15642)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           179135
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 444393
<AVERAGE-NET-ASSETS>                           1334462
<PER-SHARE-NAV-BEGIN>                            18.80
<PER-SHARE-NII>                                  (0.07)
<PER-SHARE-GAIN-APPREC>                          (0.37)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.36
<EXPENSE-RATIO>                                   2.65
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000783740
<NAME> MFS SERIES TRUST X
<SERIES>
   <NUMBER> 024
   <NAME> MFS INTERNATIONAL GROWTH AND INCOME FUND CLASS I
<MULTIPLIER> 1
       
<S>                             <C>
<PERIOD-TYPE>                   6-MOS
<FISCAL-YEAR-END>                          MAY-31-1999
<PERIOD-START>                             JUN-01-1998
<PERIOD-END>                               NOV-30-1998
<INVESTMENTS-AT-COST>                         35425987
<INVESTMENTS-AT-VALUE>                        40342579
<RECEIVABLES>                                   575755
<ASSETS-OTHER>                                   33806
<OTHER-ITEMS-ASSETS>                             17980
<TOTAL-ASSETS>                                40970120
<PAYABLE-FOR-SECURITIES>                        152217
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       219815
<TOTAL-LIABILITIES>                             372032
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                      34905050
<SHARES-COMMON-STOCK>                             1942
<SHARES-COMMON-PRIOR>                              339
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                          (88058)
<ACCUMULATED-NET-GAINS>                         862995
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       4918101
<NET-ASSETS>                                  40598088
<DIVIDEND-INCOME>                               345917
<INTEREST-INCOME>                                57298
<OTHER-INCOME>                                  (33244)
<EXPENSES-NET>                                  442387
<NET-INVESTMENT-INCOME>                         (72416)
<REALIZED-GAINS-CURRENT>                        186841
<APPREC-INCREASE-CURRENT>                      (770009)
<NET-CHANGE-FROM-OPS>                          (655584)
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                           1628
<NUMBER-OF-SHARES-REDEEMED>                        (25)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         5694002
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                       676154
<OVERDISTRIB-NII-PRIOR>                         (15642)
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                           179135
<INTEREST-EXPENSE>                                   0
<GROSS-EXPENSE>                                 444393
<AVERAGE-NET-ASSETS>                             12379
<PER-SHARE-NAV-BEGIN>                            18.95
<PER-SHARE-NII>                                  (0.01)
<PER-SHARE-GAIN-APPREC>                          (0.33)
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              18.61
<EXPENSE-RATIO>                                   1.62
<AVG-DEBT-OUTSTANDING>                               0
<AVG-DEBT-PER-SHARE>                                 0
        


</TABLE>


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