MFS UNION STANDARD TRUST
497, 1995-11-21
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MFS-REGISTERED TRADEMARK-                                             PROSPECTUS
UNION                                                          November 16, 1995
STANDARD-SM- RESEARCH FUND                         Shares of Beneficial Interest

- --------------------------------------------------------------------------------
MFS UNION STANDARD-SM- TRUST
500 Boylston Street, Boston, Massachusetts 02116      (617) 954-5000

MFS Union Standard Research Fund (the "Research Fund" or the "Fund") is a series
of MFS Union Standard-SM- Trust (the "Trust"), a professionally managed no-load,
open-end, investment management company. The Trust is designed to permit pension
plans  to  invest in  companies which  meet  certain labor  sensitivity criteria
selected for inclusion in the  ACS Labor Sensitivity Index-SM- (the  "LSI-SM-").
The  LSI is a common stock index  comprised of companies selected based on labor
sensitivity criteria.

The Research Fund seeks long-term growth of capital that, net of Fund  expenses,
exceeds  the performance of the  LSI by investing at least  65% of its assets in
the equity  securities of  the 100  largest companies  by market  capitalization
included in the LSI. The relative weighting of a company in the Fund's portfolio
will  be determined by  reference to its relative  market capitalization and its
investment merits.

The minimum  initial  investment  generally  is  $3  million  per  account  (see
"Purchases").  The Fund's  investment adviser and  distributor are Massachusetts
Financial Services Company ("MFS" or  the "Adviser") and MFS Fund  Distributors,
Inc.  ("MFD"), respectively, both  of which are located  at 500 Boylston Street,
Boston, Massachusetts 02116.

This Prospectus sets forth  concisely the information  concerning the Trust  and
the  Fund that a prospective investor ought to know before investing. The Trust,
on behalf of  the Fund, has  filed with the  Securities and Exchange  Commission
(the  "SEC") a  Statement of  Additional Information,  dated November  16, 1995,
which contains more  detailed information about  the Trust and  the Fund and  is
incorporated  into  this Prospectus  by  reference. See  page  14 for  a further
description of  the  information  set  forth  in  the  Statement  of  Additional
Information.  A copy of the Statement  of Additional Information may be obtained
without charge by contacting the Shareholder Servicing Agent (see back cover for
address and phone number).

  THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE COMMISSION  OR ANY  STATE SECURITIES  COMMISSION NOR  HAS  THE
     SECURITIES AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION
       PASSED  UPON  THE ACCURACY  OR ADEQUACY  OF THIS  PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.

   INVESTORS SHOULD READ THIS PROSPECTUS AND RETAIN IT FOR FUTURE REFERENCE.
<PAGE>
TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<C>   <S>                                                                   <C>
  1.  Expense Summary.....................................................    3
  2.  The Trust and the Fund..............................................    4
  3.  Labor Sensitivity Index.............................................    4
  4.  Investment Objective and Policies...................................    5
  5.  Investment Techniques...............................................    6
  6.  Management of the Fund..............................................    7
  7.  Information Concerning Shares of the Fund...........................    8
          Purchases.......................................................    8
          Exchanges.......................................................    9
          Redemptions.....................................................    9
          Distribution Plan...............................................   11
          Distributions...................................................   11
          Tax Status......................................................   11
          Net Asset Value.................................................   12
          Description of Shares, Voting Rights and Liabilities............   12
          Performance Information.........................................   12
          Expenses........................................................   13
  8.  Shareholder Services................................................   13
</TABLE>

                                       2
<PAGE>
1.  EXPENSE SUMMARY

<TABLE>
<CAPTION>
                                                              RESEARCH
                                                              FUND
                                                              ----
<S>                                                           <C>
SHAREHOLDER TRANSACTION EXPENSES:
    Maximum Sales Load Imposed on Purchases.................  NONE
    Maximum Sales Load Imposed on Reinvested Dividends......  NONE
    Deferred Sales Load.....................................  NONE
    Redemption Fee..........................................  NONE
    Exchange Fee............................................  NONE
ANNUAL OPERATING EXPENSES (AS A PERCENTAGE OF AVERAGE NET
 ASSETS):
    Management Fees.........................................  0.60%
    Rule 12b-1 Fees(1)......................................  0.15%
    Other Expenses (after applicable fee reduction)(2)......  0.25%
    Total Operating Expenses (after applicable fee
     reduction)(2)..........................................  1.00%
</TABLE>

- ------------------------

(1)    The  Fund has adopted a  Distribution Plan in  accordance with Rule 12b-1
    under the Investment Company Act of 1940, as amended (the "1940 Act"), which
    provides that  it will  pay distribution  fees aggregating  up to  (but  not
    necessarily  all of) 0.25% per  annum of its average  daily net assets. This
    fee is set at 0.15%  per annum of the average  daily net assets of the  Fund
    for the current fiscal year.

   
(2)     The Adviser  has agreed  to bear,  until December  31, 2000,  subject to
    reimbursement as described under "Information Concerning Shares of the  Fund
    --  Expenses," the Fund's  expenses such that  "Total Operating Expenses" do
    not exceed 1.00%  per annum  of the  average daily  net assets  of the  Fund
    during  the  current fiscal  year and  each  fiscal year  thereafter through
    December  31,  2000.  Otherwise,  "Other  Expenses"  and  "Total   Operating
    Expenses"  for the Fund for the current fiscal year would be 1.00% and 1.75%
    per annum, respectively. See "Information  Concerning Shares of the Fund  --
    Expenses."
    
                              EXAMPLE OF EXPENSES

An  investor would  pay the  following dollar  amounts of  expenses on  a $1,000
investment in the Fund, assuming (a) 5% annual return and (b) redemption at  the
end of each of the time periods indicated (unless otherwise noted):

<TABLE>
<CAPTION>
                                                                        RESEARCH
PERIOD                                                                    FUND
- ----------------------------------------------------------------------  --------
<S>                                                                     <C>
1 year................................................................  $    10
3 years...............................................................       32
</TABLE>

The  purpose of the expense table above  is to assist investors in understanding
the various costs and expenses that a shareholder of the Fund will bear directly
or  indirectly.  The  5%  annual  return  used  in  the  example  is  only   for
illustration.  More complete descriptions of the following Fund expenses are set
forth in the following sections: (i) management fees -- "Management of the  Fund
- --  Investment Adviser"  and (ii) Rule  12b-1 (I.E., distribution  plan) fees --
"Distribution Plan."

THE "EXAMPLE" SET FORTH ABOVE SHOULD NOT BE CONSIDERED A REPRESENTATION OF  PAST
OR  FUTURE EXPENSES  OF THE FUND;  ACTUAL EXPENSES  MAY BE GREATER  OR LESS THAN
THOSE SHOWN.

                                       3
<PAGE>
2.  THE TRUST AND THE FUND

The Trust  is a  no-load, open-end,  investment management  company designed  to
permit pension plans to invest in companies which meet certain labor sensitivity
criteria  selected  for inclusion  in  the LSI.  The  Trust was  organized  as a
business trust under the laws of The Commonwealth of Massachusetts on  September
1,  1993. The Trust currently  consists of two diversified  series or funds, the
Research Fund and the MFS Union  Standard Equity Fund (the "Equity Fund"),  each
of  which  represents  a  portfolio  with  separate  investment  objectives  and
policies. The Equity Fund is offered pursuant to a separate prospectus which may
be obtained without charge  by contacting the  Shareholder Servicing Agent  (see
back cover for address and phone number).

Shares  of the Fund are  continuously sold to the public  and the Fund then uses
the proceeds to  buy securities for  its portfolio. One  hundred percent of  the
amount  invested in the Fund is used to purchase shares without the deduction of
any sales charge.  The Fund  offers to  buy back  (redeem) its  shares from  its
shareholders  at  any time  at  net asset  value  without the  deduction  of any
redemption fee or sales charge. See "Purchases" and "Redemptions."

The Trust's Board of Trustees provides broad supervision over the affairs of the
Fund. MFS is the Fund's investment adviser and is responsible for the management
of the Fund's assets, while  the officers of the  Trust are responsible for  the
Fund's  operations.  MFS  manages  the  Fund's  portfolio  from  day  to  day in
accordance with its investment objective and policies. A majority of the Trust's
Trustees are not affiliated with  MFS. American Capital Strategies Ltd.  ("ACS")
administers  the LSI for MFS but  has no responsibility for rendering investment
advice to MFS or to the Fund.

3.  LABOR SENSITIVITY INDEX

The LSI is a common stock index developed  and maintained by ACS for use by  the
Trust  and  represents  the  market-weighted  performance  of  common  stocks of
companies which ACS and the Labor Advisory Board (as described below)  determine
meet  certain labor sensitivity criteria.  The "Labor Sensitivity Index-SM-" and
the "LSI-SM-" are service marks of ACS. The LSI was established on the date  the
Equity  Fund commenced investment  operations (January 14, 1994)  and, as of the
date of this  Prospectus, is  comprised of  common stocks  of approximately  545
companies  which  meet certain  quantitative  and qualitative  labor sensitivity
criteria. The criteria used  in developing and maintaining  the LSI involve  the
initial  use of  quantitative guidelines and  the subsequent  use of qualitative
guidelines applied by  ACS with the  guidance of the  Labor Advisory Board  (the
"Advisory Board"), which is comprised of senior labor officials, senior managers
of  companies  with significant  labor contracts,  academics and  other national
labor leaders or  experts and has  been established by  ACS. The Advisory  Board
provides  guidance to  ACS in  the development,  refinement, and  application of
qualitative and quantitative labor sensitivity criteria for the development  and
maintenance of the LSI. MFS is not affiliated with ACS or the Advisory Board.

In  selecting companies for inclusion  in the LSI, ACS  first compiles a list of
companies with labor agreements. The sources for this list include the  research
departments  of various international unions,  publicly available documents, and
government reports. ACS then  applies quantitative guidelines  which, as of  the
date  of this Prospectus, measure  the degree to which  a company's workforce is
unionized. At  its  discretion,  ACS  may  vary from  time  to  time  the  labor
sensitivity  factors  it  considers or  change  the  emphasis it  places  on any
specific factor.

After ACS has applied the quantitative guidelines, the list is then reviewed  by
the  Advisory Board, which assists in  the application of qualitative guidelines
which take into account a number of labor sensitivity criteria. The  qualitative
factors  considered  include, as  of the  date of  this Prospectus,  whether the
company is manufacturing or has manufactured products on the boycott list of the
AFL-CIO or certain other unions, whether the company is or has been involved  in
strikes  or  lock-outs, and  whether the  company  has demonstrated  patterns of
non-compliance with applicable  labor or  health and safety  laws. The  Advisory
Board  also  considers patterns  of outsourcing  and associated  plant closings,
patterns of strikes or lockouts, the degree to which a company's labor relations
vary throughout different divisions, subsidiaries, or parts of their company and

                                       4
<PAGE>
the extent of  foreign ownership of  a company with  a unionized workforce,  and
will  vary from time to time. This  list and any subsequent updates are supplied
to MFS by ACS. The LSI is updated at least quarterly by ACS. See "Management  of
the Fund -- Index Manager" and "-- Advisory Board" below.

Like  the Standard  & Poor's  500 Index  (the "S&P  500"), the  LSI is  a market
capitalization weighted index and reflects the reinvestment of dividends paid on
the common stocks  that comprise the  LSI. However, unlike  certain other  stock
indices,  such  as  the  S&P 500,  the  LSI  is not  a  recognized  yardstick or
measurement of investment performance.  Because of the  criteria applied in  the
selection  of companies to be included in  the LSI, the LSI may exclude entirely
or under- or  over-weight particular  industry sectors relative  to other  stock
indices  such as  the S&P 500.  The performance of  the LSI (or  the 100 largest
companies by market capitalization contained in the LSI) may not correlate  with
the performance of such other indices, such as the S&P 500, for certain periods.
As  of  the  date of  this  Prospectus,  approximately 80%  of  the  100 largest
companies by market capitalization  contained in the  LSI were also  represented
among the companies comprising the S&P 500.

On  January  14,  1994,  the  date that  the  Equity  Fund  commenced investment
operations, the unit value of the LSI was established at 100. The unit value  of
the LSI will be determined once monthly as of the last day of each month. As the
investment  objective of  the Research  Fund is  to provide  long-term growth of
capital that, net  of Fund expenses,  exceeds the performance  of the LSI,  from
time  to time the Research  Fund will compare its total  return for a given time
period to the performance of the LSI  for the same time period. See  "Investment
Objective  and  Policies"  and "Information  Concerning  Shares of  the  Fund --
Performance Information" below. The performance of the LSI shall be measured  by
comparing  the unit value of the  LSI at the end of  the time period to the unit
value of the LSI at the beginning of the time period.

The selection of a  company for investment  by the Fund  does not constitute  an
endorsement  or validation by the Fund or MFS of the criteria applied by ACS and
the Advisory Board in the  development or maintenance of  the LSI. ACS does  not
determine  the investment  policies of  the Fund  or decide  which securities of
companies included in the LSI the Fund will buy and sell.

Pursuant to a  Proxy Services  Agreement between ACS  and the  Trust, acting  on
behalf  of the  Fund, ACS shall  vote all  proxies of companies  included in the
Fund's portfolio  consistent with  proxy voting  guidelines established  by  the
AFL-CIO,  unless the  Board of  Trustees of  the Trust  directs otherwise. These
guidelines obligate ACS to  make voting decisions  consistent with the  economic
best  interests of shareholders of the Fund,  and set forth considerations to be
taken into account by ACS with respect to certain types of proxy proposals.

4.  INVESTMENT OBJECTIVE AND POLICIES

INVESTMENT OBJECTIVE --  The investment  objective of  the Research  Fund is  to
provide  long-term growth  of capital  that, net  of Fund  expenses, exceeds the
performance of the LSI. Dividend and interest income from portfolio  securities,
if  any, is incidental to the Fund's investment objective of long-term growth of
capital. Any investment  involves risk and  there can be  no assurance that  the
Fund will achieve its investment objective.

INVESTMENT  POLICIES --  The Fund seeks  to achieve its  investment objective by
investing, under normal market conditions, at least 65% of its assets in  equity
securities  of the 100  largest companies by  market capitalization contained in
the LSI (referred to as the "100 Largest LSI Companies" or the "Companies").  As
of  the  date of  this  Prospectus, the  100  Largest LSI  Companies represented
approximately 80 percent of the total market capitalization of the LSI. Each  of
the  100  Largest LSI  Companies receives  a rating  by the  investment research
analysts in the Equity Research Department of the Adviser based upon qualitative
and quantitative considerations. A Company will be rated number 1 by the Adviser
if the Adviser expects it to outperform  the S&P 500 over the succeeding  twelve
months  and will have a  portfolio weighting, at the  time of purchase, equal to
approximately 120 percent of  its relative market  capitalization among the  100
Largest  LSI Companies; a Company  will be rated number 2  by the Adviser if the
Adviser expects  it to  approximate the  performance  of the  S&P 500  over  the
succeeding  twelve months and  will have a  portfolio weighting, at  the time of
purchase,   approximately    equal    to   its    relative    weighting    among

                                       5
<PAGE>
the  100 Largest  LSI Companies;  and a Company  will be  rated number  3 by the
Adviser if  the  Adviser  expects  it  to underperform  the  S&P  500  over  the
succeeding  twelve months and  will have a  portfolio weighting, at  the time of
purchase, equal to approximately 80 percent of its relative weighting among  the
100 Largest LSI Companies.

While  the Fund may invest up to 35% of its total assets in equity securities of
companies which are not included within the 100 Largest LSI Companies, including
companies comprising the LSI other than the 100 Largest LSI Companies, the  Fund
expects  to  be fully  invested  in equity  securities  of the  100  Largest LSI
Companies, except for cash and  cash equivalent investments and the  investments
and  investment techniques  described below.  While portfolio  weightings of the
securities of the Companies purchased by the Fund are determined at the time  of
purchase,  the Fund  will periodically  readjust its  holdings to  maintain such
portfolio weightings. Such adjustments may be  appropriate due to a change in  a
ranking  assigned  to  a  Company  by  the  Adviser,  changes  in  the  relative
capitalization of the 100 Largest LSI Companies, cash inflows to the Fund (E.G.,
purchases) and cash outflows from the Fund (E.G., redemptions).

5.  INVESTMENT TECHNIQUES

SHORT-TERM INVESTMENTS:  The  Fund  may  invest  in  cash  or  cash  equivalents
including,  but not limited to, obligations  of banks (including certificates of
deposit, bankers'  acceptances  and repurchase  agreements)  with assets  of  $1
billion  or more, commercial paper, short-term notes, U.S. Government securities
and related  repurchase  agreements.  U.S. Government  securities  also  include
interests in trusts or other entities representing interests in obligations that
are  issued or guaranteed  by the U.S. Government,  its agencies, authorities or
instrumentalities. During periods of unusual market conditons when MFS  believes
that  investing  for defensive  purposes  is appropriate,  or  in order  to meet
anticipated redemption requests,  a large portion  or all of  the assets of  the
Fund may be invested in cash or cash equivalents.

LENDING OF SECURITIES: The Fund may make loans of its portfolio securities. Such
loans  will usually be made  only to member banks  of the Federal Reserve System
and member firms (and subsidiaries thereof) of the New York Stock Exchange  (the
"Exchange")  and would be  required to be secured  continuously by collateral in
cash, cash equivalents  or U.S.  Government securities maintained  on a  current
basis  at an amount at least equal to the market value of the securities loaned.
The Fund  would  continue to  collect  the equivalent  of  the interest  on  the
securities  loaned and would also receive either interest (through investment of
cash collateral) or a fee (if the collateral is U.S. Government securities). The
value of securities loaned will not exceed 30% of the value of the Fund's  total
assets.

REPURCHASE AGREEMENTS: The Fund may enter into repurchase agreements in order to
earn  additional income on  available cash or as  a temporary defensive measure.
Under a  repurchase  agreement, the  Fund  acquires securities  subject  to  the
seller's  agreement to repurchase at  a specified time and  price. If the seller
becomes subject to  a proceeding  under the bankruptcy  laws or  its assets  are
otherwise  subject to a stay order, the Fund's right to liquidate the securities
may be restricted (during which time the value of the securities could decline).
As discussed in the  Statement of Additional Information,  the Fund has  adopted
certain procedures which are intended to minimize any such risk. See "Investment
Restrictions" in the Statement of Additional Information.

WHEN-ISSUED  SECURITIES: In  order to help  ensure the  availability of suitable
securities  for  its  portfolio,   the  Fund  may   purchase  securities  on   a
"when-issued" or on a "forward delivery" basis, which means that the obligations
will  be  delivered  to the  Fund  at  a future  date  usually  beyond customary
settlement time. It is expected that, under normal circumstances, the Fund  will
take  delivery of  such securities. In  general, the  Fund does not  pay for the
securities until received and does not start earning interest on the obligations
until  the  contractual  settlement  date.   While  awaiting  delivery  of   the
obligations  purchased  on  such basis,  the  Fund will  establish  a segregated
account consisting of cash, short-term money market instruments or high  quality
debt securities equal to the amount of the commitments to purchase "when-issued"
securities. See the Statement of Additional Information for further information.

                                       6
<PAGE>
PORTFOLIO TRADING

The  Fund intends to  manage its portfolio  by buying and  selling securities in
accordance with its investment objective and  policies. The Fund will engage  in
portfolio  trading  if  it  believes  a  transaction,  net  of  costs (including
custodian charges), will help in attaining its investment objective. In  trading
portfolio  securities, the Fund  seeks to take  advantage of market developments
and variations in  the creditworthiness  of issuers.  For a  description of  the
strategies  which may be used  by the Fund in  trading portfolio securities, see
"Portfolio  Transactions  and  Brokerage   Commissions"  in  the  Statement   of
Additional Information.

The  primary  consideration  in  placing  portfolio  security  transactions with
broker-dealers for execution  is to  obtain, and maintain  the availability  of,
execution  at  the  most  favorable  prices and  in  the  most  effective manner
possible. Consistent with the foregoing primary consideration, the Rules of Fair
Practice of the National  Association of Securities  Dealers, Inc. (the  "NASD")
and such other policies as the Trustees may determine, MFS may consider sales of
shares  of investment company clients  of MFD, which is  also the distributor of
the shares of the MFS Family of Funds,  as a factor in the selection of  broker-
dealers  to execute the Fund's portfolio  transactions. For a further discussion
of portfolio trading, see the Statement of Additional Information.

                              -------------------

The  Statement  of  Additional  Information  includes  a  discussion  of   other
investment  policies  and  techniques  and  a  listing  of  specific  investment
restrictions  which  govern  the   Fund's  investment  policies.  The   specific
investment restrictions listed in the Statement of Additional Information may be
changed  without shareholder  approval, unless noted  otherwise (see "Investment
Restrictions" in the Statement of Additional Information). The Fund's investment
limitations, policies  and  rating standards  are  adhered  to at  the  time  of
purchase or utilization of assets; a subsequent change in circumstances will not
be considered to result in a violation of policy.

6.  MANAGEMENT OF THE FUND

INVESTMENT  ADVISER -- MFS  manages the Fund pursuant  to an Investment Advisory
Agreement dated November 16, 1995 (the  "Advisory Agreement") with the Trust  on
behalf  of the Fund. MFS provides the  Fund with overall investment advisory and
administrative services,  as well  as  general office  facilities. The  Fund  is
currently  managed by a committee comprised  of various equity research analysts
employed by MFS.  Subject to such  policies as the  Trustees may determine,  MFS
makes  investment decisions for  the Fund. For its  services and facilities, MFS
receives a management  fee, computed  and paid monthly,  in an  amount equal  to
0.60% per annum of the average daily net assets of the Fund.

MFS  also serves  as investment adviser  to each of  the other funds  in the MFS
Family of  Funds  (the "MFS  Funds")  and to  MFS  Municipal Income  Trust,  MFS
Multimarket  Income Trust, MFS Government Markets Income Trust, MFS Intermediate
Income  Trust,  MFS  Charter  Income   Trust,  MFS  Special  Value  Trust,   MFS
Institutional  Trust, MFS Variable  Insurance Trust, MFS/Sun  Life Series Trust,
Sun Growth Variable  Annuity Fund,  Inc. and  seven variable  accounts, each  of
which  is  a registered  investment company  established  by Sun  Life Assurance
Company of Canada (U.S.)  ("Sun Life of Canada  (U.S.)") in connection with  the
sale  of  various fixed/variable  annuity contracts.  MFS  and its  wholly owned
subsidiary, MFS Asset Management, Inc., provide investment advice to substantial
private clients.

MFS is  America's  oldest mutual  fund  organization. MFS  and  its  predecessor
organizations  have  a history  of  money management  dating  from 1924  and the
founding of the first mutual fund in the United States, Massachusetts  Investors
Trust.   Net  assets  under   the  management  of   the  MFS  organization  were
approximately $39.5  billion on  behalf of  approximately 1.7  million  investor
accounts as of September 30, 1995. As of such date, the MFS organization managed
approximately

                                       7
<PAGE>
$16  billion of  assets invested  in equity  securities and  approximately $19.9
billion of  assets  invested  in fixed  income  securities.  Approximately  $3.0
billion  of the  assets managed  by MFS  are invested  in securities  of foreign
issuers and non-U.S.  dollar denominated securities  of U.S. issuers.  MFS is  a
wholly  owned subsidiary of Sun Life of Canada (U.S.), which in turn is a wholly
owned subsidiary  of Sun  Life Assurance  Company of  Canada ("Sun  Life").  The
Directors  of MFS are A. Keith Brodkin, Jeffrey L. Shames, Arnold D. Scott, John
D. McNeil and John R.  Gardner. Mr. Brodkin is the  Chairman, Mr. Shames is  the
President  and Mr. Scott is the Secretary  and a Senior Executive Vice President
of MFS. Messrs. McNeil and Gardner are the Chairman and President, respectively,
of Sun Life. Sun Life,  a mutual life insurance company,  is one of the  largest
international  life insurance  companies and  has been  operating in  the United
States since  1895,  establishing  a  headquarters  office  here  in  1973.  The
executive officers of MFS report to the Chairman of Sun Life.

A.  Keith  Brodkin, the  Chairman and  a Director  of MFS,  is the  Chairman and
President and a Trustee of the Trust. W. Thomas London, Stephen E. Cavan,  James
R.  Bordewick, Jr.  and James  O. Yost,  all of  whom are  officers of  MFS, are
officers of the Trust.

DISTRIBUTOR -- MFD,  a wholly  owned subsidiary of  MFS, is  the distributor  of
shares of the Fund.

SHAREHOLDER  SERVICING  AGENT  --  MFS Service  Center,  Inc.  (the "Shareholder
Servicing Agent"), a wholly owned  subsidiary of MFS, performs transfer  agency,
certain dividend disbursing agency and other services for the Fund.

INDEX  MANAGER -- ACS, a  Maryland corporation with offices  at 3 Bethesda Metro
Center, Bethesda, Maryland 20814, develops,  maintains and furnishes to MFS  the
LSI pursuant to an agreement between MFS and ACS. Under this agreement, MFS pays
ACS  a fee equal to 0.05% per annum, payable quarterly, of the aggregate average
daily net assets of the Fund and  the Equity Fund, with a minimum quarterly  fee
of $82,500.

ADVISORY  BOARD  --  The Advisory  Board,  established  by ACS,  assists  in the
development and maintenance of the LSI by applying qualitative labor sensitivity
criteria and  assisting  ACS  in  developing  and  refining  quantitative  labor
sensitivity  criteria applied by ACS. The  Advisory Board is comprised of senior
labor officials, senior managers of companies with significant labor  contracts,
academics and other national labor leaders or experts.

7.  INFORMATION CONCERNING SHARES OF THE FUND
PURCHASES

Shares  of the  Fund may be  purchased directly  through MFD in  cash or in-kind
without a sales charge at their net asset value next determined after acceptance
of the purchase order by the  Fund's Shareholder Servicing Agent in Boston.  The
minimum  initial  investment generally  is $3  million. There  is no  minimum on
additional investments.

An order for  the purchase of  shares of the  Fund is accepted  upon receipt  of
federal funds available for investment. Payment by federal funds sent by wire is
accepted  immediately upon receipt and payment by check is accepted when federal
funds become  available  for investment,  which  generally occurs  on  the  next
business day after receipt of a check. Therefore, a non-federal funds investment
will  generally remain idle for one business  day after receipt or until federal
funds otherwise become available for investment. All investments in the Fund are
credited to the shareholder's account in the form of full and fractional  shares
at  the  net asset  value  per share  next  determined after  acceptance  of the
purchase order. The Fund does not issue share certificates, but the  Shareholder
Servicing  Agent maintains  an account  for each  shareholder and  mails to each
shareholder a confirmation of each purchase or sale of shares in its account.

Purchases and exchanges should be made  for investment purposes only. A  pattern
of  frequent exchanges may  be deemed by MFS  to be abusive  and contrary to the
best interests of the Fund's other  shareholders and, at the discretion of  MFS,
may  be  limited by  the Fund's  refusal to  accept additional  purchases and/or
exchanges from  the investor.  Although  the Fund  does  not have  any  specific
definition of what constitutes a pattern of frequent purchases or exchanges, and
will consider all relevant factors in determining whether a particular situation
is  abusive  and  contrary to  the  best interests  of  the Fund  and  its other

                                       8
<PAGE>
shareholders, investors should  be aware  that the  Fund may  in its  discretion
limit  or otherwise restrict the  number of times purchases  or exchanges may be
made by  an investor.  Any  such restriction  will  be made  by  the Fund  on  a
prospective basis only, upon notice to the shareholder.

OPENING  AN ACCOUNT: Payments by check should be made to the order of "MFS Union
Standard Trust-Research Fund"  and sent  to the  Trust as  follows: MFS  Service
Center,  Inc., P.O. Box  1400, Boston, MA 02104-9985.  Payments of federal funds
should be sent by wire to the custodian of the Fund as follows:

        State Street Bank and Trust Company, Boston, MA 02101
       ABA # 011000028
       BNF = MFS Union Standard Trust-Research Fund
       Account # 99034795
       OBI = (Your account as it will be registered)

Information on how to wire  federal funds is available  at any national bank  or
any  state bank which  is a member  of the Federal  Reserve System. Shareholders
must also mail  the enclosed  Account Application to  the Shareholder  Servicing
Agent.

A  shareholder purchasing  shares by wire  must first  telephone the Shareholder
Servicing Agent toll-free at (800) 637-8730 to advise of its intended action and
to obtain a wire order number.

IN-KIND PURCHASES  OF  SECURITIES:  Shares  of the  Fund  may  be  purchased  by
exchanging  securities acceptable to the Fund for Fund shares. The Fund need not
accept any security offered for exchange unless it is consistent with the Fund's
investment objective, policies and restrictions, and is otherwise acceptable  to
the  Fund.  Securities  accepted  in  exchange  for  shares  will  be  valued in
accordance with the Fund's usual  valuation procedures. Investors interested  in
making  an in-kind purchase of Fund  shares must first telephone the Shareholder
Servicing Agent toll-free at (800) 637-8730 to advise of its intended action and
obtain instructions for an in-kind purchase.

EXCHANGES

Subject to the requirements  set forth below,  some or all of  the shares in  an
account  with the Fund for which payment has been received by the Fund (I.E., an
established account)  may  be  exchanged  for shares  of  the  Equity  Fund  (if
available  for  sale) at  net asset  value.  Exchanges will  be made  only after
instructions in writing or by telephone (an "Exchange Request") are received for
an established account by  the Shareholder Servicing Agent  in proper form  (see
"Redemptions"  below).  If an  Exchange  Request is  being  used to  open  a new
account, the exchange must involve shares having an aggregate value of at  least
$3  million. If  the Exchange Request  is received by  the Shareholder Servicing
Agent on any business day prior to the close of regular trading on the Exchange,
the exchange usually will occur  on that day if  all the requirements set  forth
above  have been complied with  at that time. For  federal and (generally) state
income tax purposes, an exchange  is treated as a  sale of the shares  exchanged
and,  therefore, an exchange  could result in  a gain or  loss to non-tax-exempt
shareholders making the exchange. The exchange  privilege (or any aspect of  it)
may  be  changed  or  discontinued  upon  sixty  days  prior  written  notice to
shareholders  and  is   subject  to  certain   limitations,  including   certain
restrictions   on   purchases   by  market   timer   accounts   described  above
(see"Purchases").

REDEMPTIONS

A shareholder may withdraw all  or any portion of the  amount in its account  on
any date on which the Fund is open for business by redeeming shares at their net
asset  value. Since  the net  asset value of  shares of  the account fluctuates,
redemptions which are taxable transactions for non-tax exempt shareholders,  are
likely  to result in  gains or losses  to such shareholders.  When a shareholder
withdraws an amount from its account, the shareholder is deemed to have tendered
for redemption a sufficient number of full and fractional shares in his  account
to  cover the amount  withdrawn. The proceeds  of a redemption  will normally be
available within seven days,  except that for shares  purchased, or received  in
exchange for shares purchased, by check (including certified checks or cashier's
checks)  payment of  redemption proceeds  may be  delayed for  15 days  from the

                                       9
<PAGE>
purchase date in an  effort to assure  that such check  has cleared. Payment  of
redemption proceeds may be delayed for up to seven days from the redemption date
if  the Fund determines that such  a delay would be in  the best interest of all
its shareholders.

A. REDEMPTION BY MAIL -- Each shareholder  may redeem all or any portion of  the
shares  in its  account by  mailing or  delivering to  the Shareholder Servicing
Agent (see back  cover for address)  a stock  power with a  written request  for
redemption  or a letter of instruction all in "good order" for transfer. Because
the shareholders of  the Fund  are pension plans,  "good order"  means that  the
stock  power, written  request for redemption  or letter of  instruction must be
endorsed by  a trustee  or  an authorized  officer of  the  pension plan  or  an
authorized  officer of the pension plan's custodian and the signature(s) must be
guaranteed in the manner set forth below under the caption "Signature Guarantee"
(unless the conditions set forth thereunder are satisfied). In addition, in some
cases "good  order" requires  that the  pension plan  or its  custodian  furnish
evidence  of  authority that  the individual  signing on  the plan's  behalf has
authority to so act. The Shareholder Servicing Agent may make certain DE MINIMIS
exceptions to the above requirements  for redemption (see "Signature  Guarantee"
below).  Within  seven  days  after  receipt  of  a  redemption  request  by the
Shareholder Servicing Agent in "good order," the Fund will normally make payment
in cash  of  the net  asset  value of  the  shares next  determined  after  such
redemption  request was received, less the amount  of any income tax required to
be withheld,  except during  any period  in  which the  right of  redemption  is
suspended  or date  of payment  is postponed because  the Exchange  is closed or
trading on such Exchange is restricted  or to the extent otherwise permitted  by
the 1940 Act, if an emergency exists.

B.  REDEMPTION BY TELEPHONE  -- Each shareholder  may redeem an  amount from its
account by  telephoning  the  Shareholder Servicing  Agent  toll-free  at  (800)
637-8730.  Shareholders wishing to avail themselves of this telephone redemption
privilege must  so  elect on  their  Account Application,  designate  thereon  a
commercial  bank and account number to  receive the proceeds of such redemption,
sign the Account Application Form with the signature(s) guaranteed in the manner
set forth below under the caption "Signature Guarantee" and furnish evidence  of
authority that the individual signing on the pension plan's behalf has authority
to  so act. The proceeds of such a redemption, less the amount of any income tax
required to be withheld, are wired  in federal funds to the designated  account.
If a telephone redemption request is received by the Shareholder Servicing Agent
by the close of regular trading on the Exchange on any business day, shares will
be  redeemed at the closing net asset value  of the Fund on that day. Subject to
the conditions described in this section, proceeds of a redemption are  normally
wired  on the next business  day following the date of  receipt of the order for
redemption. The  Shareholder Servicing  Agent will  not be  responsible for  any
losses   resulting  from  unauthorized  telephone  transactions  if  it  follows
reasonable procedures  designed  to  verify  the identity  of  the  caller.  The
Shareholder  Servicing Agent will request personal or other information from the
caller, and  will normally  also record  calls. Shareholders  should verify  the
accuracy of confirmation statements immediately after their receipt.

SIGNATURE  GUARANTEE:  In order  to protect  shareholders  against fraud  to the
greatest extent possible, the  Fund requires in  certain instances as  indicated
above  that  the  shareholder's  signature be  guaranteed.  In  these  cases the
shareholder's signature must be guaranteed by an eligible bank, broker,  dealer,
credit  union, national securities  exchange, registered securities association,
clearing agency or savings association.  Signature guarantees shall be  accepted
in accordance with policies established by the Shareholder Servicing Agent. With
respect  to written requests for redemptions, no signature guarantee or evidence
that the individual executing the stock power, written request for redemption or
letter of instruction will be required if the amount of the redemption  proceeds
does  not exceed specified minimums established from time to time by MFD and the
proceeds are wired or mailed to a predesignated account or address.

If MFS determines, in its sole discretion,  that it would be detrimental to  the
best  interests of the remaining  shareholders of the Fund  or if requested by a
shareholder, the Fund may make payment  of the redemption price, either  totally
or partially, by a distribution in-kind of securities (instead of cash) from the
Fund's  portfolio. The  securities distributed in  such a  distribution would be
valued at the same amount as that assigned to them in calculating the net  asset
value for the shares being sold (see

                                       10
<PAGE>
"Net Asset Value" below). Securities distributed by the Fund will be selected by
MFS in light of the Fund's objective and will not generally represent a pro rata
distribution  of each  security held in  the Fund's portfolio.  If a shareholder
received  a  distribution  in-kind,  it  would  incur  brokerage  charges   when
converting the securities to cash.

DISTRIBUTION PLAN

The  Trustees have adopted  a distribution plan (the  "Distribution Plan" or the
"Plan") for the Fund pursuant  to Section 12(b) of the  1940 Act and Rule  12b-1
thereunder  (the  "Rule"), after  having concluded  that  there is  a reasonable
likelihood that a plan would benefit the Fund and its shareholders.

The Distribution Plan provides that the Fund will pay MFD a distribution fee  up
to  (but not necessarily all of) 0.25% per annum of the Fund's average daily net
assets in order that MFD may pay expenses  on behalf of the Fund related to  the
distribution  of shares. Payments under the  Distribution Plan have been set for
an indefinite period of time at 0.15% per annum of the Fund's average daily  net
assets.  As contemplated by the Plan, MFD  as the Fund's distributor, acts as an
agent of the  Fund in connection  with the  offering of shares  pursuant to  the
Distribution  Agreement with the Trust on behalf  of the Fund. MFD receives such
fee as partial consideration for services performed and expenses incurred in the
performance of MFD's obligations under the Distribution Agreement.

The types of expenses for  which MFD may be  compensated under the Plan  include
compensation  to and expenses of  employees of MFD who  engage in or support the
distribution  of  shares  or  who  service  shareholder  accounts,  preparation,
printing and mailing of prospectuses and statements of additional information to
other than existing shareholders, reports to shareholders such as semiannual and
annual  reports, performance reports and newsletters, sales literature and other
promotional  material  to  prospective  investors,  direct  mail   solicitation,
advertising  and  public  relations,  compensation  of  sales  personnel, office
expenses (including rent and overhead), equipment, travel and telephone expenses
and such other expenses as may be approved from time to time by the Trustees and
as  may  be  permitted  by  applicable  statute,  rule  or  regulation.  If  the
distribution  fee received by MFD exceeds its expenses, MFD may realize a profit
from these arrangements. Expenses under the Plan will be reviewed quarterly  and
the Plan will be reviewed and is subject to approval annually by the Trustees.

DISTRIBUTIONS

The  Fund intends to pay  substantially all of its  net investment income to its
shareholders as dividends on an annual basis. In determining the net  investment
income  available for  distributions, the  Fund may  rely on  projections of its
anticipated net investment income over a longer term, rather than its actual net
investment income for the  period. The Fund may  make one or more  distributions
during  the calendar year to its shareholders from any net realized long-term or
short-term capital  gains.  Shareholders  may elect  to  receive  dividends  and
capital  gain distributions in either cash or additional shares of the Fund. See
"Tax Status" and "Shareholder Services -- Distribution Options" below.

TAX STATUS

In order to minimize the taxes the Fund would otherwise be required to pay,  the
Fund  intends to elect to  be treated, and to qualify  each year as a "regulated
investment company" under Subchapter M of the Internal Revenue Code of 1986,  as
amended  (the  "Code"),  and  to  make  distributions  to  its  shareholders  in
accordance with the timing and certain  other requirements imposed by the  Code.
Because  the Fund intends to distribute all of its net investment income and net
capital gains to  its shareholders  in accordance with  the timing  requirements
imposed  by the Code, it is  expected that the Fund will  not be required to pay
any entity level federal income or excise taxes.

The Fund's shareholders that are not  liable for federal, state or local  income
taxes, such as pension plans, will generally not have to pay federal income tax,
or  any  state  and  local  income taxes,  on  the  dividends  and  capital gain
distributions they receive  from the Fund,  whether paid in  cash or  additional
shares.  Shareholders who are not tax-exempt  entities will normally have to pay
U.S. federal  income  taxes,  and any  state  and  local income  taxes,  on  the
dividends  and capital  gain distributions they  receive from  the Fund, whether
paid in cash or  additional shares. Such shareholders  should consult their  tax
advisers before making an investment in the Fund.

                                       11
<PAGE>
The  Fund  intends to  withhold U.S.  federal income  tax  at a  rate of  30% on
dividends and certain other payments that  are subject to such withholding,  and
that  are made to non-exempt  persons who are neither  citizens nor residents of
the U.S.,  regardless  of  whether  a  lower rate  may  be  permitted  under  an
applicable  law or treaty. The Fund is also required in certain circumstances to
apply backup withholding of 31% on reportable dividends and redemption  proceeds
paid  to any shareholder (including a shareholder who is neither a citizen nor a
resident of the U.S.) who does not  furnish to the Fund certain information  and
certifications  or  who is  otherwise  subject to  backup  withholding. However,
backup withholding will not be applied  to such shareholder payments which  have
had  30%  withholding taken.  Prospective shareholders  should read  the Account
Application for information regarding backup  withholding of federal income  tax
and  should consult  their own  tax advisers  as to  the tax  consequences of an
investment in the Fund.

For individual shareholders  a statement  setting forth the  federal income  tax
status  of all dividends and  distributions for each calendar  year will be sent
promptly after the end of such year.

NET ASSET VALUE

The net asset value per  share of the Fund is  determined each day during  which
the Exchange is open for trading. This determination is made once each day as of
the  close of  regular trading on  the Exchange  by deducting the  amount of the
Fund's liabilities  from  the  value  of the  Fund's  assets  and  dividing  the
difference  by the number of shares  outstanding. Assets in the Fund's portfolio
are valued on  the basis  of their  current values  or otherwise  at their  fair
values,  as described in the Statement  of Additional Information. The net asset
value  of  shares  is  effective  for  orders  accepted  by  MFD  prior  to  its
calculation.

DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES

The  Fund  currently has  one  class of  shares,  entitled Shares  of Beneficial
Interest (without par  value). The Trust  has reserved the  right to create  and
issue  additional classes  and series  of shares,  in which  case each  class of
shares of a  series would  participate equally  in the  earnings, dividends  and
assets  attributable to that  class of that  particular series. Shareholders are
entitled to one  vote for each  share held and  shares of each  series would  be
entitled to vote separately to approve investment advisory agreements or changes
in  investment restrictions, but shares of all series would vote together in the
election of Trustees  and selection  of accountants.  Additionally, each  series
will   vote  separately  on  any  material  increases  in  the  fees  under  its
Distribution Plan or on  any other matter that  affects solely that series,  but
will  otherwise vote together  with all other  series on all  other matters. The
Trust does not intend  to hold annual shareholder  meetings. The Declaration  of
Trust  provides that a Trustee may be  removed from office in certain instances.
See "Description of Shares, Voting Rights  and Liabilities" in the Statement  of
Additional Information.

Each  share of the Fund  represents an equal proportionate  interest in the Fund
with each other  share, subject  to the  liabilities of  the particular  series.
Shares  have  no pre-emptive  or conversion  rights. Shares  are fully  paid and
non-assessable. Should  the Fund  be liquidated,  shareholders are  entitled  to
share  PRO RATA  in the net  assets available for  distribution to shareholders.
Shares  will  remain  on  deposit  with  the  Shareholder  Servicing  Agent  and
certificates   will  not  be  issued  except  in  connection  with  pledges  and
assignments and in certain other limited circumstances.

The Trust is an entity of the  type commonly known as a "Massachusetts  business
trust." Under Massachusetts law, shareholders of such a trust may, under certain
circumstances,  be  held  personally  liable as  partners  for  its obligations.
However, the  risk of  a  shareholder incurring  financial  loss on  account  of
shareholder  liability  is limited  to  circumstances in  which  both inadequate
insurance existed (E.G., fidelity bonding and omission insurance) and the  Trust
itself was unable to meet its obligations.

PERFORMANCE INFORMATION

From time to time, the Fund will provide total rate of return quotations for its
shares  and may  also quote  fund rankings  in the  relevant fund  category from
various sources, such as the  Lipper Analytical Services, Inc. and  Wiesenberger
Investment  Companies Service. From time  to time the Fund  may also compare its
performance to the LSI. Total rate of return quotations will reflect the average
annual percentage change over  stated periods in the  value of an investment  in
shares of the Fund with

                                       12
<PAGE>
all  distributions reinvested.  The Fund's total  rate of  return quotations are
based on  historical  performance  and  are  not  intended  to  indicate  future
performance.  Total rate of return reflects  all components of investment return
over a stated period  of time. The  Fund's quotations may from  time to time  be
used   in  advertisements,  shareholder  reports   or  other  communications  to
shareholders. For a discussion  of the manner in  which the Fund will  calculate
its  total  rate of  return,  see the  Statement  of Additional  Information. In
addition to information provided  in shareholder reports, the  Fund may, in  its
discretion,  from time to time, make a list  of all or a portion of its holdings
available to investors upon request.

EXPENSES

The Trust pays the compensation of the Trustees who are not officers of MFS  and
all  expenses of the Fund (other than those assumed by MFS or MFD) including but
not limited to: 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  redeeming  shares and
servicing shareholder  accounts; expenses  of  preparing, printing  and  mailing
share certificates, prospectuses, periodic reports, notices and proxy statements
to  shareholders  and 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 State
Street Bank and  Trust Company, the  Fund's 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; and expenses of shareholder  meetings. Expenses relating to the  issuance,
registration  and  qualification  of shares  of  the Fund  and  the preparation,
printing and  mailing of  prospectuses are  borne by  the Fund  except that  the
Distribution Agreement with MFD requires MFD to pay for prospectuses that are to
be  used for sales purposes. Expenses of the Trust which are not attributable to
a specific series  of the Trust  are allocated  between the series  in a  manner
believed by management of the Trust to be fair and equitable.

Subject  to termination or revision at the  discretion of MFS, MFS has agreed to
bear until December 31, 2000 the foregoing  expenses of the Trust such that  the
Fund's aggregate operating expenses do not exceed 1.00% per annum of its average
daily net assets. Such payments by MFS are subject to reimbursement by the Fund,
which   will  be  accomplished  by  the  payment  by  the  Fund  of  an  expense
reimbursement fee  to MFS  computed and  paid  monthly at  a percentage  of  its
average  daily net assets  for its then  current fiscal year,  with a limitation
that immediately after such payment the aggregate operating expenses of the Fund
would  not  exceed  1.00%  of  its   average  daily  net  assets.  The   expense
reimbursement  agreement terminates for the  Fund on the earlier  of the date on
which payments made  thereunder by  such Fund equal  the prior  payment of  such
reimbursable expenses by MFS or December 31, 2000.

8.  SHAREHOLDER SERVICES

Shareholders  with questions concerning the shareholder services described below
or concerning other aspects of the Fund should contact the Shareholder Servicing
Agent.

ACCOUNT  AND   CONFIRMATION  STATEMENTS   --  Each   shareholder  will   receive
confirmation statements showing the transaction activity in its account.

DISTRIBUTION  OPTIONS -- The following options are available to all accounts and
may be changed as often as desired by notifying the Shareholder Servicing Agent:

    -- Dividends and capital gain distributions reinvested in additional shares.
       This option will be assigned if no other option is specified.

    -- Dividends in cash;  capital gain distributions  reinvested in  additional
       shares.

    -- Dividends and capital gain distributions in cash.

                                       13
<PAGE>
Dividends  and capital  gains distributions will  be reinvested (net  of any tax
withholding) in additional full and fractional shares at the net asset value  in
effect  at the close of business on  the record date. Dividends and capital gain
distributions in  amounts less  than  $10 will  automatically be  reinvested  in
additional shares of the Fund.

Any  request to change a distribution option must be received by the Shareholder
Servicing Agent by the record date for a dividend or distribution in order to be
effective for that dividend or distribution. No interest will accrue on  amounts
represented by uncashed distribution or redemption checks.
                              -------------------

The  Fund's  Statement  of  Additional  Information,  dated  November  16, 1995,
contains more  detailed information  about  the Trust  and the  Fund,  including
information  related to (i) the  investment objective, policies and restrictions
(ii) the Trustees,  officers and  investment adviser,  (iii) portfolio  trading,
(iv)  the Fund's shares,  including rights and  liabilities of shareholders, (v)
the tax status of  dividends and distributions, (vi)  the Distribution Plan  and
(vii) the method used to calculate total rate of return quotations.

                                       14
<PAGE>
INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(617) 954-5000

DISTRIBUTOR
MFS Fund Distributors, Inc.
500 Boylston Street, Boston, MA 02116
(617) 954-5000

CUSTODIAN AND DIVIDEND DISBURSING AGENT
State Street Bank and Trust Company
225 Franklin Street, Boston, MA 02110

SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: 800-637-8730
MAILING ADDRESS:
P.O. Box 1400, Boston, MA 02104-9985

INDEPENDENT ACCOUNTANTS
Deloitte & Touche LLP
125 Summer Street, Boston, MA 02110

                                      [LOGO]
                           MFS-Registered Trademark-
                               Union Standard-SM-
                                 Research Fund
                     500 Boylston Street, Boston, MA 02116
   
                                                         UST-1-11/95/1.5M
    

                           MFS-Registered Trademark-
                               Union Standard-SM-
                                 Research Fund

                                     [LOGO]
                                   PROSPECTUS
                               NOVEMBER 16, 1995
<PAGE>

MFS-REGISTERED TRADEMARK-
UNION                           STATEMENT OF
STANDARD-SM- RESEARCH FUND      ADDITIONAL INFORMATION

                                                               NOVEMBER 16, 1995

- --------------------------------------------------------------------------------

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<C>   <S>                                                                   <C>
  1.  General Information and Definitions.................................    2
  2.  Additional Investment Techniques and Risk Factors...................    2
  3.  Investment Restrictions.............................................    3
  4.  Management of the Fund..............................................    4
        Trustees..........................................................    4
        Officers..........................................................    4
        Investment Adviser................................................    4
        Custodian.........................................................    5
        Shareholder Servicing Agent.......................................    5
        Distributor.......................................................    5
  5.  Portfolio Transactions and Brokerage Commissions....................    5
  6.  Tax Status..........................................................    6
  7.  Determination of Net Asset Value; Performance Information...........    7
  8.  Distribution Plan...................................................    8
  9.  Description of Shares, Voting Rights and Liabilities................    8
 10.  Independent Accountants and Financial Statements....................    9
      Appendix A..........................................................  A-1
</TABLE>

MFS UNION STANDARD-SM- RESEARCH FUND
A Series of MFS Union Standard Trust
500 Boylston Street, Boston, Massachusetts 02116
(617) 954-5000

This  Statement of Additional Information sets forth information which may be of
interest to  investors but  which  is not  necessarily  included in  the  Fund's
Prospectus,  dated November 16,  1995. This Statement  of Additional Information
should be  read in  conjunction with  the Prospectus,  a copy  of which  may  be
obtained  without charge by contacting the Shareholder Servicing Agent (see back
cover for address and phone number).

THIS STATEMENT OF ADDITIONAL INFORMATION IS  NOT A PROSPECTUS AND IS  AUTHORIZED
FOR  DISTRIBUTION TO PROSPECTIVE INVESTORS ONLY  IF PRECEDED OR ACCOMPANIED BY A
CURRENT PROSPECTUS.
<PAGE>
1.  GENERAL INFORMATION AND DEFINITIONS

   
MFS Union Standard-SM- Trust (the "Trust") is a professionally managed open-end,
diversified,  management investment company (a  "mutual fund") designed for sale
to pension plans. The Trust currently consists of two separate series or  funds:
MFS Union Standard-SM- Research Fund (the "Research Fund" or the "Fund") and MFS
Union Standard-SM- Equity Fund (the "Equity Fund"). This Statement of Additional
Information  relates  only to  the  Research Fund.  The  Equity Fund  is offered
pursuant to a separate prospectus and statement of additional information  which
may  be obtained by  contacting the Shareholder Servicing  Agent (see back cover
for address and phone number). Additional  funds may be created by the  Trustees
from  time to time.  The Fund offers  its shares pursuant  to a prospectus dated
November  16,  1995,  as  supplemented  or  amended  from  time  to  time   (the
"Prospectus").
    

The  Fund's investment  adviser and distributor  is, respectively, Massachusetts
Financial Services Company ("MFS" or  the "Adviser") and MFS Fund  Distributors,
Inc. ("MFD" or the "Distributor"), each a Delaware corporation.

2.  ADDITIONAL INVESTMENT TECHNIQUES AND RISK FACTORS

LENDING OF SECURITIES

The  Fund may seek to increase its  income by lending portfolio securities. Such
loans will usually be made  only to member banks  of the Federal Reserve  System
and  to member firms (and  subsidiaries thereof) of the  New York Stock Exchange
(the "Exchange") and would be required to be secured continuously by  collateral
in cash, cash equivalents, or U.S. Government securities maintained on a current
basis  at an amount at least equal to the market value of the securities loaned.
The Fund would have the right to call a loan and obtain the securities loaned at
any time on customary industry settlement notice (which will usually not  exceed
five  business days). During the existence of a loan, the Fund would continue to
receive the equivalent of the  interest or dividends paid  by the issuer on  the
securities loaned and would also receive compensation based on investment of the
collateral.  The Fund would not, however, have  the right to vote any securities
having voting rights during the existence of  the loan, but would call the  loan
in anticipation of an important vote to be taken among holders of the securities
or  of the giving or withholding of their consent on a material matter affecting
the investment. As with other extensions of credit, there are risks of delay  in
recovery  or even  loss of  rights in  the collateral  should the  borrower fail
financially. However, the loans would be made only to firms deemed by MFS to  be
of  good standing,  and when,  in the judgment  of MFS,  the consideration which
could be  earned currently  from securities  loans of  this type  justifies  the
attendant  risk. If MFS determines to make  securities loans, it is not intended
that the value of  the securities loaned  would exceed 30% of  the value of  the
Fund's total assets.

WHEN-ISSUED SECURITIES

The  Fund may purchase securities on a  "when-issued" or on a "forward delivery"
basis. It  is expected  that, under  normal circumstances,  the Fund  will  take
delivery  of such securities. When the Fund  commits to purchase a security on a
"when-issued" or  on a  "forward  delivery" basis,  it  will set  up  procedures
consistent  with the General Statement of  Policy of the Securities and Exchange
Commission (the "SEC")  concerning such purchases.  Since that policy  currently
recommends  that  an amount  of the  Fund's assets  equal to  the amount  of the
purchase be held aside or segregated to  be used to pay for the commitment,  the
Fund  will always have cash, short-term money market instruments or high quality
debt securities sufficient to  cover any commitments or  to limit any  potential
risk.  However, although  the Fund  does not intend  to make  such purchases for
speculative purposes and intends  to adhere to the  provisions of SEC  policies,
purchases  of securities on such bases may involve more risk than other types of
purchases. For example, the  Fund may have  to sell assets  which have been  set
aside in order to meet redemptions. Also, if the Fund determines it is necessary
to  sell the "when-issued" or "forward  delivery" securities before delivery, it
may incur a loss because of market fluctuations since the time the commitment to
purchase such securities was made. When the time comes to pay for  "when-issued"
or  "forward delivery" securities,  the Fund will meet  its obligations from the
then-available cash flow on  the sale of securities,  or, although it would  not
normally  expect  to do  so,  from the  sale  of the  "when-issued"  or "forward
delivery" securities themselves (which may have a value greater or less than the
Fund's payment obligation).

REPURCHASE AGREEMENTS

The Fund may enter into repurchase agreements with sellers who are member  firms
(or  subsidiaries  thereof)  of the  Exchange,  members of  the  Federal Reserve
System, recognized primary  U.S. Government securities  dealers or  institutions
which  MFS has determined  to be of  comparable creditworthiness. The securities
that the  Fund  purchases  and  holds through  its  agent  are  U.S.  Government
securities,  the values,  including accrued interest,  of which are  equal to or
greater than  the  repurchase  price  agreed  to be  paid  by  the  seller.  The
repurchase  price may  be higher than  the purchase price,  the difference being
income to the Fund, or the purchase and repurchase prices may be the same,  with
interest  at a standard rate due to  the Fund together with the repurchase price
on repurchase.  In either  case, the  income to  the Fund  is unrelated  to  the
interest rate on the U.S. Government securities.

The  repurchase agreement provides that in the event the seller fails to pay the
price agreed upon on the agreed upon  delivery date or upon demand, as the  case
may be, the Fund will have the right to liquidate the securities. If at the time
the  Fund  is contractually  entitled  to exercise  its  right to  liquidate the
securities, the seller is subject to  a proceeding under the bankruptcy laws  or
its  assets are otherwise  subject to a  stay order, the  Fund's exercise of its
right to liquidate the  securities may be delayed  and result in certain  losses
and  costs to the  Fund. The Fund  has adopted and  follows procedures which are
intended to minimize the risks of  repurchase agreements. For example, the  Fund
only  enters into repurchase agreements after MFS has determined that the seller
is creditworthy, and MFS  monitors the seller's  creditworthiness on an  ongoing
basis.  Moreover, under such agreements,  the value, including accrued interest,
of the securities (which are marked to market every business day) is required to
be greater than the repurchase price, and the Fund has the right to make  margin
calls  at any time  if the value of  the securities falls  below the agreed upon
margin.

PORTFOLIO TRADING

The Fund  anticipates that  its portfolio  turnover rate  will not  exceed  100%
during its current fiscal year.

                                       2
<PAGE>
3.  INVESTMENT RESTRICTIONS

The  Fund has adopted the following restrictions which cannot be changed without
the approval of the holders of a  majority of the Fund's shares (which, as  used
in  this Statement of Additional Information, means  the lesser of (i) more than
50% of the outstanding shares of the  Trust or the Fund, as applicable, or  (ii)
67%  or more of the outstanding shares of  the Trust or the Fund, as applicable,
present at a meeting if  holders of more than 50%  of the outstanding shares  of
the  Trust or the Fund,  as applicable, are represented  in person or by proxy).
Except  for  Investment  Restriction  (1),  these  investment  restrictions  and
policies  are adhered  to at the  time of  purchase or utilization  of assets; a
subsequent change  in  circumstances will  not  be  considered to  result  in  a
violation of policy.

The Trust, on behalf of the Fund, may not:

    (1)  borrow amounts  in excess  of 33 1/3%  of its  assets including amounts
   borrowed;

    (2) underwrite securities issued by other persons except insofar as the Fund
   may technically be deemed an underwriter under the Securities Act of 1933  in
   selling a portfolio security;

    (3)  purchase or sell  real estate (including  limited partnership interests
   but excluding  securities secured  by real  estate or  interests therein  and
   securities of companies, such as real estate investment trusts, which deal in
   real  estate or interests therein), interests  in oil, gas or mineral leases,
   commodities or  commodity contracts  (excluding options,  options on  futures
   contracts, options on stock indices and any other type of option, and futures
   contracts)  in the  ordinary course  of its  business. The  Fund reserves the
   freedom  of  action  to  hold  and  to  sell  real  estate,  mineral  leases,
   commodities  or commodity  contracts (including  options, options  on futures
   contracts, options on stock indices and any other type of option, and futures
   contracts) acquired as a result of the ownership of securities;

    (4) issue any  senior securities except  as permitted by  the 1940 Act.  For
   purposes  of this  restriction, collateral  arrangements with  respect to any
   type of option (including options  on futures contracts, options and  options
   on  stock indices),  forward contracts  and futures  contracts and collateral
   arrangements with respect to initial and  variation margin are not deemed  to
   be the issuance of a senior security;

    (5)  make  loans  to other  persons.  For  these purposes,  the  purchase of
   short-term commercial paper, the purchase of a portion or all of an issue  of
   debt  securities, the lending  of portfolio securities,  or the investment of
   the Fund's  assets in  repurchase  agreements, shall  not be  considered  the
   making of a loan; or

    (6)  purchase any securities of an issuer  of a particular industry, if as a
   result, 25% or more of  its gross assets would  be invested in securities  of
   issuers  whose principal business activities are in the same industry (except
   obligations issued or guaranteed by the  U.S. Government or its agencies  and
   instrumentalities   and   repurchase   agreements   collateralized   by  such
   obligations).

In addition, the Fund  has adopted the  following nonfundamental policies  which
may  be changed without shareholder approval. The  Trust, on behalf of the Fund,
will not:

    (1) invest in illiquid investments, including securities subject to legal or
   contractual restrictions on resale or for which there is no readily available
   market (e.g.,  trading in  the security  is  suspended, or,  in the  case  of
   unlisted  securities, where no market exists) if  more than 15% of the Fund's
   net assets (taken  at market  value) would  be invested  in such  securities.
   Repurchase  agreements maturing in more than seven  days will be deemed to be
   illiquid for  purposes of  the Fund's  limitation on  investment in  illiquid
   securities.  Securities that are  not registered under  the Securities Act of
   1933, as  amended, and  sold in  reliance on  Rule 144A  thereunder, but  are
   determined  to be liquid by  the Trust's Board of  Trustees (or its delegee),
   will not be subject to this 15% limitation;

    (2) invest more than 5% of the value of the Fund's net assets, valued at the
   lower of cost or market, in warrants. Included within such amount, but not to
   exceed 2% of the value  of the Fund's net assets,  may be warrants which  are
   not  listed on the New York or  American Stock Exchange. Warrants acquired by
   the Fund in  units or  attached to  securities may  be deemed  to be  without
   value;

    (3)  purchase securities issued by any other investment company in excess of
   the amount permitted by the 1940 Act, except when such purchase is part of  a
   plan of merger or consolidation;

    (4)  purchase  or retain  securities  of an  issuer  any of  whose officers,
   directors, trustees or security holders is an officer or Trustee of the Fund,
   or is an officer or a director of the investment adviser of the Fund, if  one
   or  more  of  such persons  also  owns  beneficially more  than  0.5%  of the
   securities of such  issuer, and such  persons owning more  than 0.5% of  such
   securities together own beneficially more than 5% of such securities;

    (5)  purchase any  securities or  evidences of  interest therein  on margin,
   except that the Fund  may obtain such short-term  credit as may be  necessary
   for the clearance of any transaction and except that the Fund may make margin
   deposits  in connection with any type of option (including options on futures
   contracts, options and options on stock indices) and futures contracts;

    (6) sell any security which  the Fund does not own  unless by virtue of  its
   ownership  of other securities  the Fund has at  the time of  sale a right to
   obtain securities without payment of further consideration equivalent in kind
   and amount  to  the  securities sold  and  provided  that if  such  right  is
   conditional, the sale is made upon the same conditions;

    (7)  invest more than 5%  of its gross assets  in companies which, including
   predecessors, controlling persons, sponsoring entities, general partners  and
   guarantors,  have a record of less  than three years' continuous operation or
   relevant business experience;

    (8) pledge,  mortgage or  hypothecate in  excess  of 33  1/3% of  its  gross
   assets.  For  purposes  of  this  restriction,  collateral  arrangements with
   respect to  any  type of  option  (including options  on  futures  contracts,
   options  and options  on stock  indices), futures  contracts and  payments of
   initial and variation margin  in connection therewith,  are not considered  a
   pledge of assets;

                                       3
<PAGE>
    (9)  purchase securities while borrowings from  banks under a line of credit
   or similar arrangement exceed 5% of the Fund's total assets;

    (10) purchase or  sell any put  or call option  or any combination  thereof,
   provided  that this shall not prevent (a) the purchase, ownership, holding or
   sale of (i) warrants where the grantor  of the warrants is the issuer of  the
   underlying  securities or  (ii) put or  call options  or combinations thereof
   with respect  to  securities,  indexes  of  securities,  options  on  futures
   contracts  or (b) the  purchase, ownership, holding or  sale of contracts for
   the future delivery of securities or currencies; or

    (11) invest for the purpose of exercising control or management.

The Fund's limitations, policies and ratings restrictions are adhered to at  the
time  of purchase or utilization of assets; a subsequent change in circumstances
will not be considered to result in a violation of policy.

4.  MANAGEMENT OF THE FUND

The Board of Trustees of the  Trust provides broad supervision over the  affairs
of  the Fund.  MFS is  responsible for the  investment management  of the Fund's
assets and the  officers of the  Trust are responsible  for its operations.  The
Trustees  and  officers  of the  Trust  are  listed below,  together  with their
principal occupations during the past five years. (Their titles may have  varied
during that period.)

TRUSTEES

A.  KEITH  BRODKIN*  --  Chairman;  Massachusetts  Financial  Services  Company,
Chairman.

NELSON J. DARLING, JR. -- Director or Trustee of several corporations or trusts,
  including: Eastern Enterprises (diversified holding company), Trustee.
Address: 18 Tremont Street, Boston, Massachusetts

WILLIAM R. GUTOW -- Private Investor; Real Estate Consultant; Capitol
  Entertainment Management Company (Blockbuster Video Franchise), Vice Chairman.
Address: 3102 Maple Avenue, #100, Dallas, Texas

OFFICERS

W. THOMAS LONDON* -- Treasurer; Massachusetts Financial Services Company, Senior
Vice President.

STEPHEN E.  CAVAN*  -- Secretary  and  Clerk; Massachusetts  Financial  Services
Company, Senior Vice President, General Counsel and Assistant Secretary.

JAMES  R.  BORDEWICK,  JR.*  --  Assistant  Secretary;  Massachusetts  Financial
Services Company, Vice President and Associate General Counsel.

JAMES O. YOST* -- Assistant Treasurer; Massachusetts Financial Services Company,
Vice President.
- --------------
*"Interested persons" (as defined in the 1940 Act) of the Adviser, whose address
 is 500 Boylston Street, Boston, Massachusetts 02116.

Mr. Brodkin and each officer holds comparable positions with certain  affiliates
of  MFS  or  with certain  other  funds of  which  MFS  or a  subsidiary  is the
investment adviser or distributor.  Messrs. Brodkin and  Cavan are the  Chairman
and  the Secretary, respectively, of MFD and hold similar positions with certain
other MFS affiliates.

The Trust pays the compensation of the Trustees who are not officers of MFS (who
will each receive  $2600 annually plus  $600 per meeting  and committee  meeting
attended).  Set forth in Appendix A hereto is certain information concerning the
cash compensation paid to non-interested Trustees.

The Declaration of Trust provides that the Trust will indemnify its Trustees and
officers against liabilities and expenses incurred in connection with litigation
in which they may be involved because  of their offices with the Trust,  unless,
as  to liabilities of the  Trust or its shareholders,  it is finally adjudicated
that they  engaged  in  willful  misfeasance, bad  faith,  gross  negligence  or
reckless  disregard of the duties involved in  their offices, or with respect to
any matter, unless it is adjudicated that they did not act in good faith in  the
reasonable  belief that their actions were in the best interest of the Trust. In
the case of settlement, such indemnification will not be provided unless it  has
been  determined pursuant  to the  Declaration of  Trust, that  such officers or
Trustees have not engaged in willful misfeasance, bad faith, gross negligence or
reckless disregard of their duties.

INVESTMENT ADVISER

MFS and its predecessor organizations have a history of money management  dating
from  1924. MFS is a wholly owned subsidiary  of Sun Life of Canada (U.S.) which
in turn is a wholly owned subsidiary of Sun Life Assurance Company of Canada.

   
MFS manages the assets of the Fund pursuant to an Investment Advisory  Agreement
with  the  Trust on  behalf  of the  Fund  dated as  of  November 17,  1995 (the
"Advisory Agreement"). MFS  provides the Fund  with overall investment  advisory
and  administrative services, as  well as general  office facilities. Subject to
such policies as the Trustees may determine, MFS makes investment decisions  for
the  Fund. For these services and  facilities, the Adviser receives a management
fee, computed and paid  monthly, in an  amount equal to 0.60%  per annum of  the
average daily net assets of the Fund.
    

In  order to  comply with  the expense  limitations of  certain state securities
commissions, MFS will reduce its management fee or otherwise reimburse the  Fund
for  any  expenses,  exclusive  of interest,  taxes  and  brokerage commissions,
incurred by the Fund in any fiscal  year to the extent such expenses exceed  the
most  restrictive of such  state expense limitations.  MFS will make appropriate
adjustments to such reductions and  reimbursements in response to any  amendment
or rescission of the various state requirements.

MFS  pays the compensation of the Trust's officers  and of any Trustee who is an
officer  of  MFS.  MFS  also  furnishes   at  its  own  expense  all   necessary
administrative  services, including office space, equipment, clerical personnel,
investment advisory  facilities, and  all  executive and  supervisory  personnel
necessary   for  managing  the  Fund's   investments,  effecting  its  portfolio
transactions and, in general, administering its affairs.

   
The Advisory Agreement with  the Fund will remain  in effect until November  17,
1997,  and  will  continue in  effect  thereafter  only if  such  continuance is
specifically approved at least annually by the Board of Trustees or by vote of a
majority of the Fund's shares (as defined in "Investment Restrictions") and,  in
either  case, by a majority of the Trustees  who are not parties to the Advisory
Agreement or  interested  persons of  any  such party.  The  Advisory  Agreement
terminates automatically if it is assigned and may be terminated without penalty
by  vote  of  a  majority  of  the  Fund's  shares  (as  defined  in "Investment
Restrictions") or by either  party on not  more than 60 days'  nor less than  30
days'   written   notice.  The   Advisory  Agreement   for  the   Fund  provides
    

                                       4
<PAGE>
that if MFS ceases to serve as the investment adviser to the Fund, the Fund will
change its name so as to delete the term "MFS" and that MFS may render  services
to  others and  may permit  other fund clients  to use  the term  "MFS" in their
names. The Advisory Agreement also provides  that neither MFS nor its  personnel
shall  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 or their duties  or by reason of  reckless
disregard of its or their obligations and duties under the Advisory Agreement.

CUSTODIAN

State  Street Bank and Trust  Company (the "Custodian") is  the custodian of the
Trust's  assets.  The  Custodian's  responsibilities  include  safekeeping   and
controlling the Fund's cash and securities, handling the receipt and delivery of
securities,  determining  income and  collecting interest  and dividends  on the
Fund's investments, maintaining books of  original entry for portfolio and  fund
accounting  and other required books and accounts, and calculating the daily net
asset value  of  shares  of the  Fund.  The  Custodian does  not  determine  the
investment  policies of the Fund or decide which securities the Fund will buy or
sell. The Fund may, however, invest in securities of the Custodian and may  deal
with  the Custodian as principal in  securities transactions. The Custodian also
serves as  the dividend  and  distribution disbursing  agent  of the  Fund.  The
Custodian  has  contracted  with  MFS  for  MFS  to  perform  certain accounting
functions related  to  certain  transactions  for  which  the  Adviser  receives
remuneration on a cost basis.

SHAREHOLDER SERVICING AGENT

   
MFS  Service Center,  Inc. (the "Shareholder  Servicing Agent"),  a wholly owned
subsidiary of MFS,  is the Fund's  shareholder servicing agent,  pursuant to  an
Amended  and Restated  Shareholder Servicing Agent  Agreement with  the Trust on
behalf of the Fund, dated as of November 17, 1995 (the "Agency Agreement").  The
Shareholder  Servicing  Agent's  responsibilities  under  the  Agency  Agreement
include administering and performing transfer agent functions and the keeping of
records in connection with  the issuance, transfer and  redemption of shares  of
the Fund. For these services, the Shareholder Servicing Agent will receive a fee
based on the net assets of the Fund, computed and paid monthly. In addition, the
Shareholder  Servicing Agent will be reimbursed by the Fund for certain expenses
incurred by the Shareholder Servicing Agent on behalf of the Fund. State  Street
Bank  and Trust Company, the dividend  and distribution disbursing agent for the
Fund, has  contracted with  the Shareholder  Servicing Agent  to administer  and
perform certain dividend and distribution disbursing functions for the Fund.
    

DISTRIBUTOR

MFD,  a  wholly owned  subsidiary  of MFS,  serves  as the  distributor  for the
continuous offering of shares of the  Fund pursuant to a Distribution  Agreement
dated as of December 8, 1993 (the "Distribution Agreement").

The  Distribution Agreement will remain in effect  until August 1, 1996 and will
continue in effect thereafter only if such continuance is specifically  approved
at  least annually  by the Board  of Trustees  or by vote  of a  majority of the
Trust's shares (as defined in "Investment Restrictions") and in either case,  by
a majority of the Trustees who are not parties to such Distribution Agreement or
interested  persons  of any  such party.  The Distribution  Agreement terminates
automatically if it is assigned and may be terminated without penalty by  either
party on not more than 60 days' nor less than 30 days' notice.

5.  PORTFOLIO TRANSACTIONS AND BROKERAGE
   COMMISSIONS

Specific  decisions to  purchase or  sell securities  for the  Fund are  made by
employees of  MFS, who  are appointed  and supervised  by its  senior  officers.
Changes in the Fund's investments are reviewed by the Board of Trustees.

The  primary  consideration  in  placing  portfolio  security  transactions with
broker-dealers for  execution is  to  obtain and  maintain the  availability  of
execution  at  the  most  favorable  prices and  in  the  most  effective manner
possible. MFS has complete freedom as  to the markets in and the  broker-dealers
through  which it  seeks this  result. MFS  attempts to  achieve this  result by
selecting broker-dealers to execute portfolio transactions on behalf of the Fund
and other clients  of MFS  on the basis  of their  professional capability,  the
value  and quality of their brokerage services, and the level of their brokerage
commissions. In the case of securities, such as government securities, which are
principally traded in the over-the-counter  market (where no stated  commissions
are  paid but the  prices include a  dealer's markup or  markdown), MFS normally
seeks to deal directly  with the primary market  makers, unless in its  opinion,
better  prices are available elsewhere. In the case of securities purchased from
underwriters,  the  cost   of  such  securities   generally  includes  a   fixed
underwriting commission or concession. From time to time, soliciting dealer fees
are  available  to MFS  on  the tender  of  the Fund's  portfolio  securities in
so-called tender or exchange offers. Such  soliciting dealer fees are in  effect
recaptured  for the Fund by MFS. At  present no other recapture arrangements are
in effect.

Under the Advisory Agreement and as permitted by Section 28(e) of the Securities
Exchange Act  of 1934,  MFS may  cause the  Fund to  pay a  broker-dealer  which
provides  brokerage and  research services  to MFS  an amount  of commission for
effecting a securities transaction  for the Fund in  excess of the amount  other
broker-dealers  would have charged for the transaction if MFS determines in good
faith that the greater commission is reasonable in relation to the value of  the
brokerage  and research services provided  by the executing broker-dealer viewed
in terms of either a particular transaction or MFS's overall responsibilities to
the Fund or  to its other  clients. Not all  of such services  are useful or  of
value in advising the Fund.

The  term "brokerage and research  services" includes advice as  to the value of
securities, the  advisability  of  purchasing or  selling  securities,  and  the
availability  of purchasers  or sellers  of securities;  furnishing analyses and
reports concerning issues, industries, securities, economic factors and  trends,
portfolio  strategy and  the performance  of accounts;  and effecting securities
transactions and performing functions incidental  thereto such as clearance  and
settlement.

Although  commissions paid on every transaction will, in the judgment of MFS, be
reasonable in  relation  to  the  value  of  the  brokerage  services  provided,
commissions  exceeding those  which another broker  might charge may  be paid to
broker-dealers who were selected to execute  transactions on behalf of the  Fund
and  MFS' other clients in  part for providing advice  as to the availability of
purchasers or  sellers  of  securities  and  services  in  effecting  securities
transactions  and performing functions incidental  thereto such as clearance and
settlement.

                                       5
<PAGE>
Broker-dealers may be willing to furnish statistical, research and other factual
information or  services ("Research")  to MFS  for no  consideration other  than
brokerage  or underwriting  commissions. Securities may  be bought  or sold from
time to time  through such broker-dealers  on behalf of  the Fund. The  Trustees
(together  with the Trustees of  the MFS Funds) have  directed MFS to allocate a
total of  $20,000 of  commission business  from  the various  MFS Funds  to  the
Pershing  Division  of Donaldson,  Lufkin &  Jenrette  as consideration  for the
annual renewal of the Lipper Directors' Analytical Data Service (which  provides
information  useful to  the Trustees in  reviewing the  relationship between the
Fund and MFS).

The investment management personnel  of MFS attempt to  evaluate the quality  of
Research  provided by brokers. Results of this  effort are sometimes used by MFS
as  a  consideration  in   the  selection  of   brokers  to  execute   portfolio
transactions. However, MFS is unable to quantify the amount of commissions which
will  be  paid as  a result  of such  Research because  a substantial  number of
transactions will be effected through  brokers which provide Research but  which
were selected principally because of their execution capabilities.

The  management  fee  that  the Fund  pays  to  MFS  will not  be  reduced  as a
consequence of the  receipt of brokerage  and research services  by MFS. To  the
extent  the Fund's portfolio transactions are  used to obtain such services, the
brokerage commissions paid by the Fund will exceed those that might otherwise be
paid, by an amount which cannot be presently determined. Such services would  be
useful  and of  value to  MFS in serving  both the  Fund and  other clients and,
conversely, such services  obtained by  the placement of  brokerage business  of
other  clients would  be useful to  MFS in  carrying out its  obligations to the
Fund. While such services are  not expected to reduce  the expenses of MFS,  MFS
would, through use of the services, avoid the additional expenses which would be
incurred  if it should attempt to develop comparable information through its own
staff.

In certain instances there may be  securities which are suitable for the  Fund's
portfolio  as well as for that of one or more of the other clients of MFS or any
subsidiary of MFS. Investment decisions for the Fund and for such other  clients
are made with a view to achieving their respective investment objectives. It may
develop  that a particular security  is bought or sold  for only one client even
though it might be held  by, or bought or sold  for, other clients. Likewise,  a
particular security may be bought for one or more clients when one or more other
clients  are  selling that  same  security. Some  simultaneous  transactions are
inevitable  when  several  clients  receive  investment  advice  from  the  same
investment  adviser, particularly  when the  same security  is suitable  for the
investment objectives of  more than  one client. When  two or  more clients  are
simultaneously  engaged  in  the purchase  or  sale  of the  same  security, the
securities are allocated among clients in  a manner believed to be equitable  to
each.  It is recognized that in some  cases this system could have a detrimental
effect on the price or volume of the  security as far as the Fund is  concerned.
In  other cases, however, it is believed  that the Fund's ability to participate
in volume transactions will produce better executions for the Fund.

6.  TAX STATUS

The Fund intends to elect to be treated and to qualify each year as a "regulated
investment company" under Subchapter M of the Internal Revenue Code of 1986,  as
amended  (the "Code"), by  meeting all applicable  requirements of Subchapter M,
including requirements as to the nature  of the Fund's gross income, the  amount
of  Fund distributions,  and the  composition and  holding period  of the Fund's
portfolio assets.  Because  the  Fund  intends to  distribute  all  of  its  net
investment  income and net realized capital  gains to shareholders in accordance
with the timing and certain  other requirements imposed by  the Code, it is  not
expected  that the  Fund will be  required to  pay any federal  income or excise
taxes. If  the  Fund  should fail  to  qualify  for treatment  as  a  "regulated
investment  company" in any year, the Fund would incur regular corporate federal
income tax upon  its taxable income  and Fund distributions  would generally  be
taxable as ordinary dividend income to non-exempt shareholders. The Fund will be
subject  to a nondeductible 4% excise tax  ("Excise Tax") to the extent it fails
to distribute by the end of any calendar year substantially all of its  ordinary
income  for that year and capital gain net income for the one-year period ending
on October 31  of that year,  plus certain other  amounts. As long  as the  Fund
qualifies  for treatment  as a regulated  investment company under  the Code, it
will not be subject to any Massachusetts excise or income taxes.

Shareholders of the Fund who are  not tax-exempt entities normally will have  to
pay  federal income  taxes and  any state  or local  taxes on  the dividends and
capital gain distributions they receive  from the Fund. Dividends from  ordinary
income  and any distributions from net short-term capital gains, whether paid to
shareholders who are non tax-exempt entities  in cash or additional shares,  are
taxable  to  these  shareholders  as  ordinary  income  for  federal  income tax
purposes. A portion  of the Fund's  ordinary income dividends  (but none of  its
capital  gains) is  normally eligible  for the  dividends-received deduction for
corporations if  the  recipient  otherwise qualifies  for  that  deduction  with
respect  to its holding of  the Fund's shares. Availability  of the deduction to
particular corporate shareholders is subject to certain limitations and deducted
amounts may be subject to the alternative minimum tax or result in certain basis
adjustments. Distributions  of  net  capital  gain  (I.E.,  the  excess  of  net
long-term capital gains over net short-term capital losses), whether received in
cash   or  reinvested  in  additional  shares,  are  taxable  to  non-tax-exempt
shareholders as long-term capital gains for federal income tax purposes  without
regard  to the  length of  time the  shareholders have  held their  shares. Fund
dividends which are  declared in October,  November, or December,  and paid  the
following  January will be taxable to non-tax-exempt shareholders as if received
on December 31 of the year in which they are declared.

Any Fund distribution will have the effect  of reducing the per share net  asset
value  of shares  in the  Fund by the  amount of  the distribution. Shareholders
purchasing shares in  the Fund  shortly before the  record date  of any  taxable
dividend  or other distribution may  thus pay the full  price for the shares and
then effectively  receive a  portion of  the purchase  price back  as a  taxable
distribution.

In  general, any gain or  loss realized upon a  taxable disposition of shares of
the Fund by  a shareholder that  holds such shares  as a capital  asset will  be
treated  as long-term capital gain or loss if the shares have been held for more
than twelve months and  otherwise as short-term capital  gain or loss.  However,
any  loss realized upon a disposition of shares in a Fund held for six months or
less will  be  treated  as  a  long-term capital  loss  to  the  extent  of  any
distributions  of net capital gain  made with respect to  those shares. Any loss
realized upon a redemption of shares may also be disallowed under rules relating
to wash sales.

The Fund's  current dividend  and accounting  policies will  affect the  amount,
timing,  and character of distributions to  shareholders, and may, under certain
circumstances, make an economic return  of capital taxable to shareholders.  Any
investment by the Fund in certain securities purchased at a market discount will
cause it to realize income prior to the receipt of cash payments with respect to
these securities. In order

                                       6
<PAGE>
to distribute this income and avoid a tax on such Fund, the Fund may be required
to  liquidate portfolio  securities that  it might  otherwise have  continued to
hold, potentially resulting in additional taxable gain or loss to the Fund.

7.  DETERMINATION OF NET ASSET VALUE;
   PERFORMANCE INFORMATION

NET ASSET VALUE

The net asset value per  share of the Fund is  determined each day during  which
the Exchange is open for trading. As of the date of this Statement of Additional
Information,  the  Exchange is  open for  trading every  weekday except  for the
following holidays (or  the days on  which they are  observed): New Year's  Day,
Presidents'  Day,  Good  Friday,  Memorial  Day,  Independence  Day,  Labor Day,
Thanksgiving Day and Christmas Day). This determination is made once during each
such day as of  the close of  regular trading on the  Exchange by deducting  the
amount  of the Fund's liabilities from the  value of its assets and dividing the
difference by the number  of shares of the  Fund outstanding. Securities in  the
Fund's  portfolio (other  than short-term  obligations) for  which the principal
market is one or more securities or commodities exchanges will be valued at  the
last  reported sale price or at the  settlement price prior to the determination
(or if there has been no current sale, at the closing bid price) on the  primary
exchange  on which such securities  are traded; but if  a securities exchange is
not the  principal  market  for  securities, such  securities  will,  if  market
quotations  are readily available, be valued  at current bid prices, unless such
securities are reported on the NASDAQ system,  in which case they are valued  at
the  last sale price or, if no sales occurred during the day, at the last quoted
bid price. Short-term obligations, if any, in the Fund's portfolio are valued at
amortized cost,  which constitutes  fair value  as determined  by the  Board  of
Trustees.  Short-term securities with a remaining  maturity in excess of 60 days
will be valued based upon  dealer supplied valuations. Portfolio securities  for
which  there  are  no quotations  or  valuations  are valued  at  fair  value as
determined in good  faith by or  at the direction  of the Board  of Trustees.  A
share's net asset value is effective for orders accepted by MFD, in its capacity
as the Fund's distributor, prior to its calculation.

PERFORMANCE INFORMATION

TOTAL  RATE OF  RETURN: The  Fund will  calculate its  total rate  of return for
certain periods by  determining the  average annual compounded  rates of  return
over  those periods  that would  cause an  investment of  $1,000 (made  with all
distributions reinvested) to reach  the value of that  investment at the end  of
the  periods. The Fund may also calculate  total rates of return which represent
aggregate performance over a period or year-by-year performance.

From time to time, the Fund may quote, and compare its performance to, the  LSI.
In addition, from time to time the Fund may, as appropriate, quote Fund rankings
or  reprint all or a  portion of evaluations of  fund performance and operations
appearing in various independent publications, including but not limited to  the
following:  Money,  Fortune, U.S.  News and  World Report,  Kiplinger's Personal
Finance, The Wall Street Journal, Barron's, Investors Business Daily,  Newsweek,
Financial World, Financial Planning, Investment Advisor, USA Today, Pensions and
Investments,  SmartMoney,  Forbes,  Global  Finance,  Registered Representative,
Institutional Investor,  the  Investment Company  Institute,  Johnson's  Charts,
Morningstar, Lipper Analytical Services, Inc., CDA Wiesenberger, Shearson Lehman
and  Salomon  Bros. Indices,  Ibbotson, Business  Week, Lowry  Associates, Media
General, Investment  Company Data,  The New  York Times,  Your Money,  Strangers
Investment  Advisor,  Financial Planning  on Wall  Street, Standard  and Poor's,
Individual Investor,  THE  100  BEST MUTUAL  FUNDS  YOU  CAN BUY  by  Gordon  K.
Williamson,   Consumer  Price  Index,  and  Sanford  C.  Bernstein  &  Co.  Fund
performance may  also be  compared  to the  performance  of other  mutual  funds
tracked  by financial or business publications or periodicals. The Fund may also
quote evaluations mentioned  in independent radio  or television broadcasts  and
may  use charts and graphs to illustrate the past performance of various indices
such as  those mentioned  above and  illustrations using  hypothetical rates  of
return  to illustrate the effects of  compounding and tax-deferral. The Fund may
advertise examples of the  effects of periodic  investment plans, including  the
principle  of dollar cost  averaging. In such  a program, an  investor invests a
fixed dollar amount in  a fund at periodic  intervals, thereby purchasing  fewer
shares  when prices are high  and more shares when prices  are low. While such a
strategy does not assure a profit or guard against a loss in a declining market,
the investor's average  cost per share  can be  lower than if  fixed numbers  of
shares are purchased at the same intervals.

MFS FIRSTS: MFS has a long history of innovations.

- -- 1924  -- Massachusetts Investors  Trust is established  as the first open-end
   mutual fund in America.

- -- 1924 -- Massachusetts Investors Trust is  the first mutual fund to make  full
   public disclosure of its operations in shareholder reports.

- -- 1932  -- One  of the  first internal  research departments  is established to
   provide in-house analytical capability for an investment management firm.

- -- 1933 -- Massachusetts Investors  Trust is the first  mutual fund to  register
   under  the  Securities  Act of  1933.  ("Truth  in Securities  Act"  or "Full
   Disclosure Act".)

- -- 1936 --  Massachusetts Investors  Trust is  the first  mutual fund  to  allow
   shareholders  to take capital gain  distributions either in additional shares
   or in cash.

- -- 1976 --  MFS Municipal  Bond Fund  is among  the first  municipal bond  funds
   established.

- -- 1979 -- Spectrum becomes the first combination fixed/variable annuity with no
   initial sales charge.

   
- -- 1981 -- MFS World Governments Fund is established as America's first globally
   diversified fixed-income mutual fund.
    

- -- 1984  -- MFS Municipal High Income Fund  is the first open-end mutual fund to
   seek high tax-free income from lower-rated municipal securities.

- -- 1986 -- MFS Managed Sectors Fund becomes the first mutual fund to target  and
   shift investments among industry sectors for shareholders.

- -- 1986  --  MFS  Municipal Income  Trust  is the  first  closed-end, high-yield
   municipal bond fund traded on the New York Stock Exchange.

- -- 1987 -- MFS  Multimarket Income  Trust is the  first closed-end,  multimarket
   high income fund listed on the New York Stock Exchange.

- -- 1989    --    MFS    Regatta    becomes    America's    first   non-qualified
   market-value-adjusted fixed/variable annuity.

- -- 1990 -- MFS World Total Return Fund is the first global balanced fund.

- -- 1993 -- MFS World Growth  Fund is the first  global emerging markets fund  to
   offer the expertise of two sub-advisers.

                                       7
<PAGE>
- -- 1993  -- MFS  becomes money  manager of MFS  Union Standard  Trust, the first
   trust to invest in companies deemed to be union-friendly by an Advisory Board
   of senior  labor officials,  senior managers  of companies  with  significant
   labor contracts, academics and other national labor leaders or experts.

8.  DISTRIBUTION PLAN

The  Trustees have adopted  a Distribution Plan for  the Fund (the "Distribution
Plan") pursuant to Section 12(b) of the 1940 Act and Rule 12b-1 thereunder  (the
"Rule")  after having concluded  that there is a  reasonable likelihood that the
Distribution Plan would benefit the Fund and its shareholders. The  Distribution
Plan  is designed  to promote  sales, thereby increasing  the net  assets of the
Fund. Such an increase  may reduce the  expense ratio to  the extent the  Fund's
fixed  costs are spread over  a larger net asset base.  Also, an increase in net
assets may lessen the adverse effects  that could result were the Fund  required
to liquidate portfolio securities to meet redemptions.

The  Distribution Plan provides that the Fund will pay MFD a distribution fee up
to (but not necessarily all of) 0.25% per annum of the Fund's average daily  net
assets.  Payments under  the Distribution Plan  have been set  for an indefinite
period of time at 0.15% per annum of the Fund's average daily net assets.

The Distribution  Plan will  remain in  effect from  year to  year only  if  its
continuance  is  specifically approved  at least  annually by  vote of  both the
Trustees and a  majority of  the Trustees who  are not  "interested persons"  or
financially  interested  parties  to  the  Plan  ("Distribution  Plan  Qualified
Trustees"). The Distribution  Plan requires  that the  Fund and  MFD each  shall
provide  to the Trustees, and  the Trustees shall review,  at least quarterly, a
written report of the amounts expended (and purposes therefor) under such  Plan.
The Distribution Plan may be terminated at any time by vote of a majority of the
Distribution  Plan Qualified Trustees or by vote of the holders of a majority of
the Fund's shares  (as defined in  "Investment Restrictions"). Agreements  under
the  Distribution Plan must  be in writing, will  be terminated automatically if
assigned, and may be terminated at any  time without payment of any penalty,  by
vote of a majority of the Distribution Plan Qualified Trustees or by vote of the
holders  of a majority  of the Fund's  shares. The Distribution  Plan may not be
amended to increase  materially the  amount of  permitted distribution  expenses
without  the  approval  of  a  majority of  the  Fund's  shares  (as  defined in
"Investment Restrictions") and may not be materially amended in any case without
a vote  of  the Trustees  and  a majority  of  the Distribution  Plan  Qualified
Trustees.  No  Trustee  who is  not  an  "interested person"  has  any financial
interest in the Distribution Plan or in any related agreement.

9.  DESCRIPTION OF SHARES, VOTING RIGHTS AND LIABILITIES

The Trust's Declaration of Trust permits the  Trustees of the Trust to issue  an
unlimited  number of full and fractional  Shares of Beneficial Interest (without
par value) of one or more separate series and to divide or combine the shares of
any series into a  greater or lesser number  of shares without thereby  changing
the  proportionate  beneficial  interests  in  that  series.  The  Trustees have
currently authorized shares of the two series, the Research Fund and the  Equity
Fund.  The Declaration of  Trust further authorizes the  Trustees to classify or
reclassify any series of shares into one  or more classes. The Trustees have  no
current  intention to classify more than one  class of shares. Each share of the
Fund represents an equal proportionate interest in the assets of the Fund.  Upon
liquidation  of the Fund, shareholders of are  entitled to share PRO RATA in the
net assets of  the Fund available  for distribution to  shareholders. The  Trust
reserves  the right to create and issue  additional series or classes of shares,
in which  case  the  shares of  each  class  would participate  equally  in  the
earnings, dividends and assets allocable to that class of the particular series.

Shareholders  are entitled to one  vote for each share held  and may vote in the
election of Trustees and on other matters submitted to meetings of shareholders.
Although Trustees are  not elected  annually by  the shareholders,  shareholders
have  under certain circumstances  the right to  remove one or  more Trustees in
accordance with the  provisions of Section  16(c) of the  1940 Act. No  material
amendment  may be made to the Declaration  of Trust without the affirmative vote
of a majority of  the Trust's shares. Shares  have no pre-emptive or  conversion
rights.  Shares are fully  paid and non-assessable.  The Trust may  enter into a
merger or consolidation, or sell all or substantially all of its assets (or  all
or  substantially all of  the assets belonging  to any series  of the Trust), if
approved by the  vote of the  holders of two-thirds  of the Trust's  outstanding
shares  voting as a single class, or of the affected series of the Trust, as the
case may be, except  that if the  Trustees of the  Trust recommend such  merger,
consolidation  or sale, the approval by vote of the holders of a majority of the
Trust's or the affected  series' outstanding shares  (as defined in  "Investment
Restrictions") will be sufficient. The Trust or any series of the Trust may also
be  terminated (i) upon liquidation and  distribution of its assets, if approved
by the vote of the holders of  two-thirds of its outstanding shares, or (ii)  by
the  Trustees by written notice to the shareholders of the Trust of the affected
series. If not so terminated, the Trust will continue indefinitely.

The Trust is an entity of the  type commonly known as a "Massachusetts  business
trust." Under Massachusetts law, shareholders of such a trust may, under certain
circumstances,  be  held  personally  liable as  partners  for  its obligations.
However, the Declaration of Trust contains an express disclaimer of  shareholder
liability  for acts or obligations of the Trust and provides for indemnification
and reimbursement of expenses out of

                                       8
<PAGE>
Trust property for any shareholder held personally liable for the obligations of
the Trust.  The  Declaration of  Trust  also  provides that  it  shall  maintain
appropriate  insurance (for example,  fidelity bonding and  errors and omissions
insurance)  for  the  protection  of  the  Trust,  its  shareholders,  Trustees,
officers,  employees  and agents  covering possible  tort or  other liabilities.
Thus, the  risk  of  a  shareholder  incurring  financial  loss  on  account  of
shareholder  liability  is limited  to  circumstances in  which  both inadequate
insurance existed and the Trust itself was unable to meet its obligations.

The Declaration of Trust further provides that obligations of the Trust are  not
binding  upon the Trustees individually but only  upon the property of the Trust
and that the Trustees will not be liable  for any action or failure to act,  but
nothing  in the Declaration of Trust protects a Trustee against any liability to
which he would otherwise be subject by reason of willful misfeasance, bad faith,
gross negligence, or reckless disregard of the duties involved in the conduct of
his office.

10.  INDEPENDENT ACCOUNTANTS AND FINANCIAL STATEMENTS

Deloitte & Touche LLP are the Fund's independent certified public accountants.

                                       9
<PAGE>
                                                                      APPENDIX A

                           TRUSTEE COMPENSATION TABLE

<TABLE>
<CAPTION>
                                                                   TOTAL TRUSTEE FEES
                                                    TRUSTEE FEES     FROM THE FUND
NAME OF TRUSTEE                                     FROM FUND(1)      COMPLEX (2)
- --------------------------------------------------  ------------   ------------------
<S>                                                 <C>            <C>
William R. Gutow..................................     $2,500            $3,759
Nelson J. Darling.................................      2,500             3,759
</TABLE>

NOTES:

(1) Estimated, for fiscal year ended September 30, 1996.

(2) For  calendar year 1994. All  Trustees served as Trustees  of 4 funds within
    the MFS Fund Complex (having aggregate  net assets at December 31, 1994,  of
    approximately $143 million).

                                      A-1
<PAGE>
INVESTMENT ADVISER
Massachusetts Financial Services Company
500 Boylston Street, Boston, MA 02116
(617) 954-5000

DISTRIBUTOR
MFS Fund Distributors, Inc.
500 Boylston Street, Boston, MA 02116
(617) 954-5000

CUSTODIAN AND DIVIDEND DISBURSING AGENT
State Street Bank and Trust Company
225 Franklin Street, Boston, MA 02110

SHAREHOLDER SERVICING AGENT
MFS Service Center, Inc.
500 Boylston Street, Boston, MA 02116
Toll free: (800) 637-8730
MAILING ADDRESS
P.O. Box 1400, Boston, MA 02104-9985

INDEPENDENT ACCOUNTANTS
Deloitte & Touche LLP
125 Summer Street, Boston, MA 02110

MFS-REGISTERED TRADEMARK- UNION
STANDARD-SM- RESEARCH FUND
500 BOYLSTON STREET
BOSTON, MA 02116


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