MFS SERIES TRUST XI
NSAR-B, 1999-11-26
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<PAGE>      PAGE  1
000 B000000 09/30/1999
000 C000000 0000911637
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 XI
001 B000000 811-7992
001 C000000 6179545000
002 A000000 500 BOYLSTON ST
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 UNION STANDARD EQUITY FUND
007 C030100 N
007 C010200  2
007 C020200 VERTEX ALL CAP FUND
007 C030200 N
007 C010300  3
007 C020300 VERTEX U.S. ALL CAP FUND
007 C030300 N
007 C010400  4
007 C020400 VERTEX CONTRARIAN FUND
007 C030400 N
007 C010500  5
007 C010600  6
007 C010700  7
007 C010800  8
007 C010900  9
007 C011000 10
010 A00AA01 MASSACHUSETTS FINANCIAL SERVICES COMPANY
010 B00AA01 801-17352
010 C01AA01 BOSTON
010 C02AA01 MA
010 C03AA01 02116
011 A00AA01 MFS FUND DISTRIBUTORS, INC.
011 B00AA01 8-27864
011 C01AA01 BOSTON
011 C02AA01 MA
011 C03AA01 02116
011 C04AA01 3741
<PAGE>      PAGE  2
012 A00AA01 MFS SERVICE CENTER, INC.
012 B00AA01 84-1316
012 C01AA01 BOSTON
012 C02AA01 MA
012 C03AA01 02111
012 C04AA01 1738
020 A000001 DONALDSON, LUFKIN, & JENRETTE
020 B000001 13-2741729
020 C000001     68
020 A000002 INSTINET
020 B000002 13-3443395
020 C000002     26
020 A000003 GOLDMAN SACHS & CO
020 B000003 13-5108880
020 C000003     21
020 A000004 WEEDEN & CO
020 B000004 13-3364318
020 C000004     16
020 A000005 PERSHING DIVISION OF DONA
020 B000005 13-2741729
020 C000005     14
020 A000006 MORGAN STANLEY & CO
020 B000006 13-2655998
020 C000006     13
020 A000007 DUNLEVY & CO INC
020 B000007 13-2919975
020 C000007     10
020 A000008 MERRILL LYNCH PIERCE FENNER
020 B000008 13-5674085
020 C000008      9
020 A000009 SALOMON SMITH BARNEY
020 B000009 13-3082694
020 C000009      8
020 A000010 PAINE WEBBER INC
020 B000010 13-2638166
020 C000010      7
021  000000      258
022 A000001 BANK OF BOSTON-DEALER
022 B000001 00-0000000
022 C000001    455205
022 D000001         0
022 A000002 SALOMON SMITH BARNEY
022 B000002 13-3082694
022 C000002    168024
022 D000002     14980
022 A000003 CAROL MCENTEE
022 B000003 13-2650270
022 C000003    163647
022 D000003         0
022 A000004 CHASE SECURITIES INC
022 B000004 13-3112953
<PAGE>      PAGE  3
022 C000004    133035
022 D000004      4995
022 A000005 CS FIRST BOSTON
022 B000005 13-5659485
022 C000005    124771
022 D000005      3476
022 A000006 BANK OF AMERICA
022 B000006 94-1687665
022 C000006    124614
022 D000006      3476
022 A000007 PRUDENTIAL SECURITIES INC
022 B000007 22-2347336
022 C000007    120983
022 D000007       414
022 A000008 MORGAN STANLEY & CO
022 B000008 13-2655998
022 C000008     71687
022 D000008      3327
022 A000009 GOLDMAN SACHS & CO
022 B000009 13-5108880
022 C000009     27519
022 D000009     13893
022 A000010 MERRILL LYNCH
022 B000010 13-5674085
022 C000010     25821
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<PAGE>      PAGE  4
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008 D030101 02116
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<PAGE>      PAGE  5
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<PAGE>      PAGE  6
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<PAGE>      PAGE  7
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<PAGE>      PAGE  8
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<PAGE>      PAGE  9
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008 A000201 VERTEX INVESTMENT MANAGEMENT, INC.
008 B000201 A
008 C000201 801-17352
008 D010201 BOSTON
008 D020201 MA
<PAGE>      PAGE  10
008 D030201 02116
008 D040201 3741
013 A000201 ERNST & YOUNG LLP
013 B010201 BOSTON
013 B020201 MA
013 B030201 02116
013 B040201 5072
015 A000201 STATE STREET BANK AND TRUST COMPANY
015 B000201 C
015 C010201 BOSTON
015 C020201 MA
015 C030201 02110
015 E010201 X
015 A000202 STATE STREET INTERNATIONAL
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015 C030202 02169
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018  000200 Y
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<PAGE>      PAGE  11
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<PAGE>      PAGE  12
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<PAGE>      PAGE  13
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<PAGE>      PAGE  14
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<PAGE>      PAGE  15
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008 A000301 VERTEX INVESTMENT MANAGEMENT, INC.
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008 D030301 02116
008 D040301 3741
013 A000301 ERNST & YOUNG LLP
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013 B030301 02116
013 B040301 5072
015 A000301 STATE STREET BANK AND TRUST COMPANY
015 B000301 C
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015 C030301 02110
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025 A000302 MERRILL LYNCH & CO., INC.
025 B000302 13-5674085
<PAGE>      PAGE  16
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<PAGE>      PAGE  17
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<PAGE>      PAGE  18
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<PAGE>      PAGE  19
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<PAGE>      PAGE  20
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008 A000401 VERTEX INVESTMENT MANAGEMENT, INC.
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008 D010401 BOSTON
008 D020401 MA
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013 A000401 ERNST & YOUNG LLP
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<PAGE>      PAGE  21
013 B020401 MA
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015 A000401 STATE STREET BANK AND TRUST COMPANY
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<PAGE>      PAGE  22
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<PAGE>      PAGE  24
068 B000400 N
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070 E020400 N
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070 G020400 N
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070 J020400 N
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<PAGE>      PAGE  25
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<PAGE>      PAGE  26
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SIGNATURE   JAMES O. YOST
TITLE       TREASURER



<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 011
   <NAME> MFS UNION STANDARD EQUITY FUND CLASS A
<MULTIPLIER> 1

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 012
   <NAME> MFS UNION STANDARD EQUITY FUND CLASS B
<MULTIPLIER> 1

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 013
   <NAME> MFS UNION STANDARD EQUITY FUNF CLASS C
<MULTIPLIER> 1

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</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 014
   <NAME> MFS UNION STANDARD EQUITY FUND CLASS I
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000911637
<NAME> SERIES TRUST XI
<SERIES>
   <NUMBER> 020
   <NAME> VERTEX ALL CAP FUND
<MULTIPLIER> 1

<S>                             <C>
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</TABLE>

<TABLE> <S> <C>

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<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 030
   <NAME> VERTEX U.S. ALL CAP FUND
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1999
<PERIOD-START>                             OCT-01-1998
<PERIOD-END>                               SEP-30-1999
<INVESTMENTS-AT-COST>                          2149150
<INVESTMENTS-AT-VALUE>                         2063271
<RECEIVABLES>                                   160714
<ASSETS-OTHER>                                       0
<OTHER-ITEMS-ASSETS>                            187001
<TOTAL-ASSETS>                                 2410986
<PAYABLE-FOR-SECURITIES>                        131631
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                       770548
<TOTAL-LIABILITIES>                             902179
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       1251753
<SHARES-COMMON-STOCK>                           110345
<SHARES-COMMON-PRIOR>                            35507
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         339125
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                       (82071)
<NET-ASSETS>                                   1508807
<DIVIDEND-INCOME>                                 5012
<INTEREST-INCOME>                                 4779
<OTHER-INCOME>                                    (75)
<EXPENSES-NET>                                 (21193)
<NET-INVESTMENT-INCOME>                        (11477)
<REALIZED-GAINS-CURRENT>                        361313
<APPREC-INCREASE-CURRENT>                      (47980)
<NET-CHANGE-FROM-OPS>                           301856
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                            0
<DISTRIBUTIONS-OF-GAINS>                             0
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                          75107
<NUMBER-OF-SHARES-REDEEMED>                      (269)
<SHARES-REINVESTED>                                  0
<NET-CHANGE-IN-ASSETS>                         1202954
<ACCUMULATED-NII-PRIOR>                              0
<ACCUMULATED-GAINS-PRIOR>                            0
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                     (10711)
<GROSS-ADVISORY-FEES>                            21079
<INTEREST-EXPENSE>                                2076
<GROSS-EXPENSE>                                  61637
<AVERAGE-NET-ASSETS>                           1049231
<PER-SHARE-NAV-BEGIN>                             8.61
<PER-SHARE-NII>                                 (0.14)
<PER-SHARE-GAIN-APPREC>                           5.20
<PER-SHARE-DIVIDEND>                                 0
<PER-SHARE-DISTRIBUTIONS>                            0
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              13.67
<EXPENSE-RATIO>                                   2.05


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 6
<CIK> 0000911637
<NAME> MFS SERIES TRUST XI
<SERIES>
   <NUMBER> 040
   <NAME> VERTEX CONTRARIAN FUND
<MULTIPLIER> 1

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1999
<PERIOD-START>                             OCT-01-1998
<PERIOD-END>                               SEP-30-1999
<INVESTMENTS-AT-COST>                          5264340
<INVESTMENTS-AT-VALUE>                         5851827
<RECEIVABLES>                                  1098381
<ASSETS-OTHER>                                   13409
<OTHER-ITEMS-ASSETS>                            765349
<TOTAL-ASSETS>                                 7728966
<PAYABLE-FOR-SECURITIES>                       1197992
<SENIOR-LONG-TERM-DEBT>                              0
<OTHER-ITEMS-LIABILITIES>                      2267635
<TOTAL-LIABILITIES>                            3465627
<SENIOR-EQUITY>                                      0
<PAID-IN-CAPITAL-COMMON>                       2730332
<SHARES-COMMON-STOCK>                           181872
<SHARES-COMMON-PRIOR>                            40657
<ACCUMULATED-NII-CURRENT>                            0
<OVERDISTRIBUTION-NII>                               0
<ACCUMULATED-NET-GAINS>                         927060
<OVERDISTRIBUTION-GAINS>                             0
<ACCUM-APPREC-OR-DEPREC>                        605947
<NET-ASSETS>                                   4263339
<DIVIDEND-INCOME>                                 2648
<INTEREST-INCOME>                                 7457
<OTHER-INCOME>                                       0
<EXPENSES-NET>                                 (57150)
<NET-INVESTMENT-INCOME>                        (47045)
<REALIZED-GAINS-CURRENT>                        975918
<APPREC-INCREASE-CURRENT>                       644656
<NET-CHANGE-FROM-OPS>                          1573529
<EQUALIZATION>                                       0
<DISTRIBUTIONS-OF-INCOME>                       (1392)
<DISTRIBUTIONS-OF-GAINS>                       (15613)
<DISTRIBUTIONS-OTHER>                                0
<NUMBER-OF-SHARES-SOLD>                         163296
<NUMBER-OF-SHARES-REDEEMED>                    (23405)
<SHARES-REINVESTED>                               1324
<NET-CHANGE-IN-ASSETS>                         3873853
<ACCUMULATED-NII-PRIOR>                           1392
<ACCUMULATED-GAINS-PRIOR>                        13800
<OVERDISTRIB-NII-PRIOR>                              0
<OVERDIST-NET-GAINS-PRIOR>                           0
<GROSS-ADVISORY-FEES>                            47104
<INTEREST-EXPENSE>                               37167
<GROSS-EXPENSE>                                 139533
<AVERAGE-NET-ASSETS>                           2392764
<PER-SHARE-NAV-BEGIN>                             9.58
<PER-SHARE-NII>                                 (0.37)
<PER-SHARE-GAIN-APPREC>                          14.45
<PER-SHARE-DIVIDEND>                            (0.02)
<PER-SHARE-DISTRIBUTIONS>                       (0.20)
<RETURNS-OF-CAPITAL>                                 0
<PER-SHARE-NAV-END>                              23.44
<EXPENSE-RATIO>                                   2.41


</TABLE>

INDEPENDENT AUDITORS' REPORT


To the Trustees and Shareholders of MFS Series Trust XI:

In planning and  performing  our audit of the financial  statements of MFS Union
Standard Equity Fund (a series of MFS Series Trust XI) (the "Fund") for the year
ended  September 30, 1999 (on which we have issued our report dated  November 4,
1999),  we considered its internal  control,  including  control  activities for
safeguarding  securities,  in order to determine our auditing procedures for the
purpose of expressing our opinion on the financial statements and to comply with
the  requirements  of Form  N-SAR,  and not to provide  assurance  on the Fund's
internal control.

The  management of the Fund is  responsible  for  establishing  and  maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are  fairly   presented  in  conformity  with  generally   accepted   accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use or disposition.

Because of inherent  limitations in any internal  control,  misstatements due to
error  or  fraud  may  occur  and  not be  detected.  Also,  projections  of any
evaluation  of internal  control to future  periods are subject to the risk that
the internal control may become  inadequate  because of changes in conditions or
that the degree of compliance with policies or procedures deteriorates.

Our consideration of the Fund's internal control would not necessarily  disclose
all  matters  in  internal  control  that  might be  material  weaknesses  under
standards established by the American Institute of Certified Public Accountants.
A material  weakness is a condition  in which the design or  operation of one or
more of the internal  control  components  does not reduce to a  relatively  low
level the risk that misstatements caused by error or fraud in amounts that would
be material in relation to the financial  statements being audited may occur and
not be detected  within a timely  period by  employees  in the normal  course of
performing their assigned functions.  However, we noted no matters involving the
Fund's internal control and its operation,  including  controls for safeguarding
securities  that we consider to be material  weaknesses  as defined  above as of
September 30, 1999.

This report is intended solely for the  information  and use of management,  the
Board  of  Trustees,  and the  Securities  and  Exchange  Commission  and is not
intended  to be and  should not be used by anyone  other  than  these  specified
parties.

DELOITTE & TOUCHE LLP

Boston, Massachusetts
November 4, 1999


<PAGE>








                         Report of Independent Auditors


To the Trustees
MFS Series Trust XI

In planning and performing our audits of the financial  statements of Vertex All
Cap Fund,  Vertex U.S. All Cap Fund,  and Vertex  Contrarian  Fund ("the funds")
three of the  funds  comprising  the MFS  Series  Trust XI,  for the year  ended
September  30, 1999,  we  considered  its internal  control,  including  control
activities  for  safeguarding  securities,  in order to  determine  our auditing
procedures for the purpose of expressing our opinion on the financial statements
and to comply with the requirements of Form N-SAR,  not to provide  assurance on
internal control.

The  management of the Funds is responsible  for  establishing  and  maintaining
internal control. In fulfilling this responsibility,  estimates and judgments by
management  are  required to assess the expected  benefits and related  costs of
controls.  Generally,  controls  that are  relevant  to an audit  pertain to the
entity's objective of preparing financial  statements for external purposes that
are  fairly   presented  in  conformity  with  generally   accepted   accounting
principles.   Those  controls   include  the   safeguarding  of  assets  against
unauthorized acquisition, use or disposition.

Because of inherent  limitations in internal  control,  error or fraud may occur
and not be detected.  Also,  projection of any evaluation of internal control to
future periods is subject to the risk that it may become  inadequate  because of
changes in conditions or that the  effectiveness of the design and operation may
deteriorate.

Our consideration of internal control would not necessarily disclose all matters
in  internal   control  that  might  be  material   weaknesses  under  standards
established  by the  American  Institute  of  Certified  Public  Accountants.  A
material weakness is a condition in which the design or operation of one or more
of the internal control components does not reduce to a relatively low level the
risk  that  misstatements  caused  by error or fraud in  amounts  that  would be
material in relation to the financial statements being audited may occur and not
be  detected  within a timely  period  by  employees  in the  normal  course  of
performing  their assigned  functions.  However,  we noted no matters  involving
internal  control  and  its  operation,   including  controls  for  safeguarding
securities,  that we  consider  to be material  weaknesses  as defined  above at
September 30, 1999.

This report is intended solely for the  information  and use of management,  the
Board of  Trustees  of MFS Series  Trust XI,  and the  Securities  and  Exchange
Commission and is not intended to be and should not be used by anyone other than
these specified parties.



                                                              ERNST & YOUNG LLP
November 9, 1999




SUB-ITEM 77C For the Vertex Funds only (VAC, VCF and VRF): A Special  Meeting of
Shareholders was held on August 25, 1999.

The  relevant  matter  voted  upon  at the  meeting  was the  approval  of a new
Investment Advisory Agreement between Vertex Investment Management, Inc. and MFS
Series Trust XI on behalf of VAC, VCF and VRF.

Votes cast were as follows:
<TABLE>
<CAPTION>
     Fund          Affirmative Votes Cast         Negative Votes Cast
<S>    <C>                    <C>                             <C>
       VAC                    160,762.140                     134.982
       VRF                    108,518.723                           0
       VCF                    128,865.423                     149.856
</TABLE>





EXHIBIT 77Q1
                                    FORM OF
                         INVESTMENT ADVISORY AGREEMENT


         INVESTMENT ADVISORY AGREEMENT,  dated this 1st day of October, 1999, by
and between MFS SERIES TRUST XI, a  Massachusetts  business trust (the "Trust"),
on behalf of VERTEX  ____________ FUND, a series of the Trust (the "Fund"),  and
VERTEX INVESTMENT MANAGEMENT, INC., a Delaware corporation (the "Adviser").

                                                      WITNESSETH:

         WHEREAS, the Trust is engaged in business as an open-end investment
company registered under the Investment Company Act of 1940; and

         WHEREAS, the Adviser is willing to provide business services to the
Fund on the terms and conditions hereinafter set forth;

         NOW, THEREFORE, in consideration of the mutual covenants and agreements
of the parties  hereto as herein set forth,  the parties  covenant  and agree as
follows:

         Article 1. Duties of the Adviser.  The Adviser  shall  provide the Fund
with such investment  advice and supervision as the latter may from time to time
consider  necessary for the proper  supervision of its funds.  The Adviser shall
act as adviser to the Fund and as such shall furnish  continuously an investment
program  and  shall  determine  from  time  to time  what  securities  shall  be
purchased, sold or exchanged and what portion of the assets of the Fund shall be
held  uninvested,  subject always to the restrictions of the Trust's Amended and
Restated  Declaration  of Trust,  dated January 24, 1996,  and By-Laws,  each as
amended from time to time  (respectively,  the "Declaration" and the "By-Laws"),
to  the  provisions  of the  Investment  Company  Act of  1940  and  the  Rules,
Regulations and orders thereunder and to the Fund's then-current  Prospectus and
Statement of Additional Information. The Adviser shall also make recommendations
as to the manner in which voting rights,  rights to consent to corporate  action
and any other rights  pertaining  to the Fund's  portfolio  securities  shall be
exercised.  Should  the  Trustees  at  any  time,  however,  make  any  definite
determination  as to the  investment  policy and notify the  Adviser  thereof in
writing,  the Adviser shall be bound by such  determination  for the period,  if
any,   specified  in  such  notice  or  until   similarly   notified  that  such
determination  shall be revoked.  The Adviser shall take, on behalf of the Fund,
all actions  which it deems  necessary  to  implement  the  investment  policies
determined  as provided  above,  and in  particular  to place all orders for the
purchase or sale of portfolio  securities for the Fund's account with brokers or
dealers  selected by it, and to that end, the Adviser is authorized as the agent
of the  Fund  to  give  instructions  to the  Custodian  of the  Fund  as to the
deliveries  of  securities  and payments of cash for the account of the Fund. In
connection with the selection of such brokers or dealers and the placing of such
orders,  the  Adviser is  directed  to seek for the Fund  execution  at the most
reasonable  price  by  responsible  brokerage  firms at  reasonably  competitive
commission  rates.  In  fulfilling  this  requirement,  the Adviser shall not be
deemed to have acted  unlawfully or to have  breached any duty,  created by this
Agreement or otherwise,  solely by reason of its having caused the Fund to pay a
broker or dealer an amount of commission for effecting a securities  transaction
in excess of the  amount  of  commission  another  broker or dealer  would  have
charged for effecting that transaction,  if the Adviser determined in good faith
that such amount of  commission  was  reasonable in relation to the value of the
brokerage  and research  services  provided by such broker or dealer,  viewed in
terms  of  either  that   particular   transaction  or  the  Adviser's   overall
responsibilities with respect to the Fund and to other clients of the Adviser as
to which the Adviser exercises investment discretion.

The Adviser may from time to time enter into sub-investment  advisory agreements
with one or more  investment  advisers  with such  terms and  conditions  as the
Adviser may determine,  provided that such  sub-investment  advisory  agreements
have been approved in accordance  with  applicable  provisions of the Investment
Company Act of 1940.  Subject to the  provisions of Article 6, the Adviser shall
not be liable for any error of judgment or mistake of law by any  sub-adviser or
for any loss arising out of any  investment  made by any  sub-adviser or for any
act or omission in the execution and management of the Fund by any sub-adviser.

         Article 2.  Allocation  of Charges  and  Expenses.  The  Adviser  shall
furnish at its own expense  investment  advisory  and  administrative  services,
office  space,  equipment  and clerical  personnel  necessary  for servicing the
investments of the Fund and maintaining its organization and investment advisory
facilities and executive and supervisory  personnel for managing the investments
and effecting the portfolio transactions of the Fund. The Adviser shall arrange,
if desired by the Trust, for Directors, officers and employees of the Adviser to
serve as Trustees,  officers or agents of the Trust if duly elected or appointed
to such positions and subject to their individual consent and to any limitations
imposed by law. It is understood  that the Fund will pay all of its own expenses
including,  without  limitation,  compensation of Trustees "not affiliated" with
the Adviser;  governmental fees; interest charges; taxes; membership dues in the
Investment  Company  Institute  allocable  to the  Fund;  fees and  expenses  of
independent auditors, of legal counsel, and of any transfer agent,  registrar or
dividend  disbursing  agent of the Fund;  expenses of repurchasing and redeeming
shares and servicing shareholder accounts;  expenses of preparing,  printing and
mailing stock certificates,  shareholder reports,  notices, proxy statements and
reports to governmental  officers and commissions;  brokerage and other expenses
connected  with the execution,  recording and  settlement of portfolio  security
transactions;  insurance  premiums;  fees and expenses of the  custodian for all
services  to the  Fund,  including  safekeeping  of  funds  and  securities  and
maintaining  required books and accounts;  expenses of calculating the net asset
value of shares of the Fund;  expenses of shareholders'  meetings;  and expenses
relating to the issuance,  registration and  qualification of shares of the Fund
and the  preparation,  printing and mailing of  prospectuses  for such  purposes
(except to the extent that any  Distribution  Agreement  to which the Trust is a
party provides that another party is to pay some or all of such expenses).

         Article 3. Compensation of the Adviser. For the services to be rendered
and the  facilities  to be  provided,  the Fund shall pay to the  Adviser a base
investment advisory fee subject to a performance  adjustment,  computed and paid
monthly,  beginning,  in the case of the  performance  adjustment  only,  in the
thirteenth  month  following  commencement  of operations of the Fund.  The base
investment  advisory  fee  shall be at an  annual  rate of  1.50% of the  Fund's
average daily net assets from May 1, 1998 through  September 30, 1999, and 2.00%
of the Fund's average daily net assets thereafter.  The base investment advisory
fee shall be increased by 0.10% (for all  performance  periods ended on or prior
to September 30, 1999) or 0.20% (for all  performance  periods ended on or after
October 31, 1999) for each full 1% that the investment  performance of a Class A
share of  beneficial  interest  of the Fund  during the  performance  period has
exceeded  the  investment  record of the index,  and shall be decreased by 0.10%
(for all  performance  periods ended on or prior to September 30, 1999) or 0.20%
(for all  performance  periods ended on or after October 31, 1999) for each full
1% by which the investment performance of a Class A share of beneficial interest
of the Fund  during the  performance  period  has been less than the  investment
record of the index; provided, however, that no increase or decrease in the base
investment  advisory  fee rate shall  exceed 1.50% per annum for the period from
May 1, 1998 through September 30, 1999, and 2.00% per annum thereafter.  As used
in this Article 3, the term "index" means such  appropriate  index of securities
prices as the Trust's Board of Trustees  shall choose from time to time, and the
term  "performance  period" means the twelve month period ending on the last day
of the month immediately  preceding the monthly  computation  called for by this
Article 3. In  computing  the  amount of the base fee,  the fee shall be applied
against the Fund's  average  daily net assets  computed over the month for which
the base fee is paid; in computing the amount of the performance adjustment, the
adjustment shall be applied against the Fund's average daily net assets computed
over the performance  period. If the Adviser shall serve for less than the whole
of any  period  specified  in this  Article 3, the  compensation  payable to the
Adviser with respect to the Fund shall be prorated.

         Article 4. Special Services.  Should the Trust have occasion to request
the  Adviser  to perform  services  not herein  contemplated  or to request  the
Adviser to arrange  for the  services of others,  the  Adviser  will act for the
Trust on  behalf  of the Fund  upon  request  to the best of its  ability,  with
compensation  for the Adviser's  services to be agreed upon with respect to each
such occasion as it arises.

         Article 5.  Covenants of the Adviser.  The Adviser  agrees that it will
not  deal  with  itself,  or with  the  Trustees  of the  Trust  or the  Trust's
distributor, if any, as principals in making purchases or sales of securities or
other  property  for  the  account  of the  Fund,  except  as  permitted  by the
Investment Company Act of 1940 and the Rules,  Regulations or orders thereunder,
will not take a long or short  position  in the  shares  of the Fund  except  as
permitted by the  Declaration,  and will comply with all other provisions of the
Declaration  and the By-Laws and the  then-current  Prospectus  and Statement of
Additional Information of the Fund relative to the Adviser and its Directors and
officers.

         Article 6.  Limitation  of Liability of the Adviser.  The Adviser shall
not be  liable  for any  error of  judgment  or  mistake  of law or for any loss
arising out of any  investment  or for any act or omission in the  execution and
management  of the Fund,  except  for  willful  misfeasance,  bad faith or gross
negligence in the performance of its duties and obligations  hereunder.  As used
in this Article 6, the term  "Adviser"  shall  include  Directors,  officers and
employees of the Adviser as well as that corporation itself.

         Article 7.  Activities  of the Adviser.  The services of the Adviser to
the Fund are not  deemed  to be  exclusive,  the  Adviser  being  free to render
investment  advisory  and/or  other  services  to others.  The  Adviser  and its
successors or assignees may permit other fund clients to use the initials  "MFS"
in their  names.  The Fund  agrees  that if the  Adviser  or its  successors  or
assignees  shall for any reason no longer  serve as the  Adviser to the Fund and
the Fund's name contains the initials "MFS", the Fund will change its name so as
to delete the initials "MFS." It is understood  that the Trustees,  officers and
shareholders of the Trust are or may be or become interested in the Adviser,  as
Directors,  officers,  employees, or otherwise and that Directors,  officers and
employees of the Adviser are or may become  similarly  interested  in the Trust,
and that the Adviser may be or become interested in the Fund as a shareholder or
otherwise.

         Article 8. Duration,  Termination and Amendment of this Agreement. This
Agreement  shall  become  effective  on the date first  above  written and shall
govern the relations between the parties hereto thereafter,  and shall remain in
force  until  September  30,  2001 on which  date it will  terminate  unless its
continuance  after  September  30,  2001  is  "specifically  approved  at  least
annually" (i) by the vote of a majority of the Trustees of the Trust who are not
"interested  persons" of the Trust or of the  Adviser at a meeting  specifically
called  for the  purpose  of voting on such  approval,  and (ii) by the Board of
Trustees  of the Trust,  or by "vote of a  majority  of the  outstanding  voting
securities" of the Fund.

         This Agreement may be terminated at any time without the payment of any
penalty by the  Trustees  or by "vote of a majority  of the  outstanding  voting
securities" of the Fund, or by the Adviser,  in each case on not more than sixty
days' nor less than  thirty  days'  written  notice  to the  other  party.  This
Agreement shall automatically terminate in the event of its "assignment".

         This  Agreement  may be amended  only if such  amendment is approved by
"vote of a majority of the outstanding voting securities" of the Fund.

         Article  9.  Scope  of  Trust's  Obligations.  A copy  of  the  Trust's
Declaration of Trust is on file with the Secretary of State of The  Commonwealth
of  Massachusetts.  The Adviser  acknowledges that the obligations of or arising
out of  this  Agreement  are  not  binding  upon  any of the  Trust's  trustees,
officers, employees, agents or shareholders individually, but are binding solely
upon the assets and property of the Trust.  If this Agreement is executed by the
Trust  on  behalf  of one or more  series  of the  Trust,  the  Adviser  further
acknowledges  that the assets and  liabilities  of each  series of the Trust are
separate  and  distinct  and  that the  obligations  of or  arising  out of this
Agreement are binding  solely upon the assets or property of the series on whose
behalf the Trust has executed this Agreement.

         Article  10.  Definitions.  The terms  "specifically  approved at least
annually,"  "vote  of  a  majority  of  the  outstanding   voting   securities,"
"assignment,"   "affiliated  person,"  "investment   performance,"   "investment
record," and "interested  person," when used in this  Agreement,  shall have the
respective  meanings  specified,  and shall be construed in a manner  consistent
with,  the  Investment  Company  Act of  1940  and  the  Rules  and  Regulations
promulgated thereunder,  subject,  however, to such exemptions as may be granted
by the Securities and Exchange Commission under said Act.

         Article 11. Record Keeping. The Adviser will maintain records in a form
acceptable to the Trust and in compliance  with the rules and regulations of the
Securities  and  Exchange  Commission,  including  but not  limited  to  records
required to be maintained by Section 31(a) of the Investment Company Act of 1940
and the rules  thereunder,  which at all times will be the property of the Trust
and will be available for inspection and use by the Trust.

         IN WITNESS  WHEREOF,  the  parties  have caused  this  Agreement  to be
executed and  delivered  in their names and on their behalf by the  undersigned,
thereunto duly authorized,  and their respective seals to be hereto affixed, all
as of the day and year first written above. The undersigned Trustee of the Trust
has  executed  this  Agreement  not  individually,  but  as  Trustee  under  the
Declaration.

                    MFS SERIES TRUST XI, on behalf of
                    VERTEX __________ FUND, one of its series

                        By:
                         James R. Bordewick, Jr.
                         Assistant Secretary
                         VERTEX INVESTMENT MANAGEMENT, INC.

                        By:
                         Jeffrey L. Shames
                         Chairman



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