MASSACHUSETTS INVESTORS TRUST
497, 1998-12-14
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<PAGE>

                         MASSACHUSETTS INVESTORS TRUST

          Supplement  dated May 1, 1998 (as revised  December  15,  1998) to the
   Prospectus and Statement of Additional Information of Massachusetts
                          Investors Trust (the "Fund")


     The following  information  should be read in  conjunction  with the Fund's
Prospectus and Statement of Additional  Information  ("SAI"),  also dated May 1,
1998, and contains a description of Class I shares.

     Class I shares are  available  for  purchase  only by certain  investors as
described under the caption "Eligible Purchasers" below.

     As of December 15, 1998, the Expense Summary Table is revised as follows:

EXPENSE SUMMARY

Shareholder Transaction Expenses:                                     Class I
   Maximum Initial Sales Charge Imposed on Purchases of Fund
     Shares (as a percentage of offering price).....................    None
   Maximum Contingent Deferred Sales Charge (as a percentage
     of original purchase price or redemption proceeds, 
     as applicable).................................................    None

Annual Operating Expenses of the Fund (as a percentage of average net assets):
   Management Fees..................................................   0.33%
   Rule 12b-1 Fees..................................................    None
   Other Expenses(1)................................................   0.22%
   Total Operating Expenses.........................................   0.55%
 .......................
(1)  The Fund  has an  expense  offset  arrangement  which  reduces  the  Fund's
     custodian fee based upon the amount of cash maintained by the Fund with its
     custodian  and  dividend  disbursing  agent,  and may enter into other such
     arrangements and directed brokerage arrangements (which would also have the
     effect of reducing the Fund's expenses).  These fee reductions, if any, are
     not reflected under "Other Expenses."

                              Example of Expenses

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

                   Period                         Class I

                   1 year.....................      $ 6
                   3 years....................       18
                   5 years....................       31
                   10 years...................       69

     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.  A  more  complete  description  of  the  Fund's
management  fee is set forth under the caption  "Management  of the Fund" in the
Prospectus.

     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.



<PAGE>


CONDENSED FINANCIAL INFORMATION

     The  following   information  has  been  audited  and  should  be  read  in
conjunction with the financial  statements  included in the Fund's Annual Report
to  Shareholders  which are  incorporated  by reference into the SAI in reliance
upon the report of the Fund's independent  auditors,  given upon their authority
as experts in  accounting  and  auditing.  The Fund's  independent  auditors are
Deloitte & Touche LLP.

Financial Highlights - Class I Shares

                                                               Period Ended
                                                             December 31,1997***
Per share data (for a share outstanding throughout the period):
Net asset value - beginning of period                             $  14.33
                                                                  --------

Income from investment operations # -
     Net investment income                                        $   0.26
     Net realized and unrealized gain on investments 
          and foreign currency transactions                           4.44
                                                                  --------
         Total from investment operations                         $   4.70
                                                                  ---------

Less distributions declared to shareholders -
     From net investment income                                   $  (0.23)
     From net realized gain on investments and foreign 
          currency transactions                                      (1.27)
     In excess of net investment income                              (0.01)
                                                                  ----------
         Total distributions declared to shareholders             $  (1.51)
                                                                  ---------

Net asset value - end of period                                   $  17.52
                                                                   -------
Total return                                                         33.30%++
Ratios (to average net assets)/Supplemental data:
     Expenses##                                                       0.41%+
     Net investment income                                            1.42%+
Portfolio turnover                                                      44%
Average Commission Rate                                           $   0.0573
Net assets at end of period (000 omitted)                         $   22,555
- --------------------------
***   For the  period  from the  inception  of Class I shares,  January  2, 1997
      through December 31, 1997.
#     Per share data are based on average shares outstanding.
##    The Trust's expenses are calculated without reduction for fees paid
      indirectly.
+     Annualized.
++    Not annualized.

ELIGIBLE PURCHASERS

Class I shares are  available  for  purchase  only by the  following  purchasers
Eligible Purchasers:

(i)  certain  retirement  plans  established  for the  benefit of  employees  of
     Massachusetts Financial Services Company ("MFS"), the Fund's investment
     adviser, and employees of MFS' affiliates;

(ii) any fund distributed by MFS Fund  Distributors,  Inc.  ("MFD"),  the Fund's
     distributor,  if the fund  seeks to achieve  its  investment  objective  by
     investing  primarily in shares of the Fund and other funds  distributed  by
     MFD;

(iii)any retirement  plan,  endowment or foundation  which (a) purchases  shares
     directly through MFD (rather than through a third party broker or dealer or
     other financial intermediary);  (b) has, at the time of purchase of Class I
     shares, aggregate assets of at least $100 million; and (c) invests at least
     $10  million in Class I shares of the Fund either  alone or in  combination
     with  investments  in Class I shares of other MFS funds  distributed by MFD
     (additional  investments may be made in any amount);  provided that MFD may
     accept  purchases  from smaller  plans,  endowments  or  foundations  or in
     smaller amounts if it believes, in its sole discretion,  that such entity's
     aggregate  assets  will equal or exceed $100  million,  or that such entity
     will make additional  investments  which will cause its total investment to
     equal or exceed $10 million, within a reasonable period of time;
<PAGE>

(iv) bank trust  departments or law firms acting as trustee or manager for trust
     accounts which initially invest, on behalf of their trust clients, at least
     $100,000 in Class I shares of the Fund (additional  investments may be made
     in any amount);  provided that MFD may accept smaller initial  purchases if
     it believes, in its sole discretion,  that the bank trust department or law
     firm  will make  additional  investments,  on behalf of its trust  clients,
     which will cause its total  investment to equal or exceed $100,000 within a
     reasonable period of time; and

(v)  certain  retirement  plans offered,  administered or sponsored by insurance
     companies,  provided that these plans and insurance  companies meet certain
     criteria established by MFD from time to time.

     In no event  will the Fund,  MFS,  MFD or any of their  affiliates  pay any
sales commissions or compensation to any third party in connection with the sale
of Class I shares;  the  payment of any such sales  commission  or  compensation
would,  under the Fund's  policies,  disqualify  the  purchaser  as an  eligible
investor of Class I shares.

SHARE CLASSES OFFERED BY THE FUND

     Four classes of shares of the Fund currently are offered for sale,  Class A
shares,  Class B shares,  Class C shares and Class I shares.  Class I shares are
available for purchase only by Eligible  Purchasers,  as defined above,  and are
described in this Supplement.  Class A shares, Class B shares and Class C shares
are  described in the Fund's  Prospectus  and are  available for purchase by the
general public.

     Class A shares are offered at net asset value plus an initial  sales charge
up to a maximum of 5.75% of the offering  price (or a contingent  deferred sales
charge (a "CDSC") upon  redemption of 1.00% during the first year in the case of
purchases of $1 million or more and certain purchases by retirement  plans), and
are  subject to an annual  distribution  fee and  service fee up to a maximum of
0.35% per  annum.  Class B shares  are  offered  at net asset  value  without an
initial sales charge but are subject to a CDSC upon  redemption  (declining from
4.00%  during the first  year to 0% after six years) and an annual  distribution
fee and service fee up to a maximum of 1.00% per annum;  Class B shares  convert
to Class A shares  approximately eight years after purchase.  Class C shares are
offered at net asset value  without an initial sales charge but are subject to a
CDSC upon  redemption of 1.00% during the first year and an annual  distribution
fee and  service  fee up to a maximum  of 1.00% per  annum.  Class I shares  are
offered at net asset value  without an initial  sales charge or CDSC and are not
subject  to a  distribution  or service  fee.  Class C and Class I shares do not
convert to any other class of shares of the Fund.

OTHER INFORMATION

     Eligible  Purchasers may purchase Class I shares only directly through MFD.
Eligible  Purchasers  may exchange Class I shares of the Fund for Class I shares
of any other MFS Fund  available  for purchase by such  Eligible  Purchasers  at
their net asset value (if available for sale),  and may exchange  Class I shares
of the Fund for shares of the MFS Money Market Fund (if available for sale), and
may redeem Class I shares of the Fund at net asset value.  Distributions paid by
the Fund with  respect to Class I shares  generally  will be greater  than those
paid with respect to Class A shares,  Class B shares and Class C shares  because
expenses  attributable  to Class A  shares,  Class B shares  and  Class C shares
generally will be higher.


   The date of this Supplement is May 1, 1998 (as revised December 14, 1998).



<PAGE>

                         MASSACHUSETTS INVESTORS TRUST
                    Supplement to the May 1, 1998 Prospectus

         As of December  15,  1998,  the Expense  Summary  section of the Fund's
Prospectus is revised as follows:

1.    EXPENSE SUMMARY

Shareholder Transaction Expenses:                 Class A   Class B    Class C
  Maximum Initial Sales Charge Imposed 
    on Purchases of Fund Shares (as a 
    percentage of offering price)...............   5.75%     0.00%      0.00%
  Maximum Contingent Deferred Sales Charge (as a
    percentage of original purchase price or
    redemption proceeds, as applicable)......... See Below1  4.00%      1.00%

Annual Operating Expenses of the Fund (as a percentage of average daily net
assets):
   Management Fees..............................   0.33%     0.33%      0.33%
   Rule 12b-1 Fees..............................   0.35%(2)  1.00%(3)   1.00%(3)
   Other Expenses(4)............................   0.22%     0.22%      0.22%(5)
                                                   -----     -----      --------
   Total Operating Expenses.....................   0.90%     1.55%      1.55%
- --------------------
1.    Purchases of $1 million or more and certain  purchases by retirement plans
      are not subject to an initial sales charge; however, a contingent deferred
      sales charge ("CDSC") of 1% will be imposed on such purchases in the event
      of  certain  redemption  transactions  within  12  months  following  such
      purchases  (see  "Information  Concerning  Shares of the Fund - Purchases"
      below).
2.    The Fund has adopted a distribution plan for its shares in accordance
      with Rule 12b-1 under the Investment Company Act of 1940, as amended
      (the "1940 Act") (the "Distribution Plan"), which provides that it will
      pay distribution/service fees aggregating up to (but not necessarily all
      of) 0.35% per annum of the average daily net assets attributable to
      Class A shares.  The 0.25% per annum service fee is reduced to 0.15% per
      annum for shares purchased prior to January 2, 1991.  Distribution
      expenses paid under this Plan, together with the initial sales charge,
      may cause long-term shareholders to pay more than the maximum sales
      charge that would have been permissible if imposed entirely as an
      initial sales charge.  (See "Information Concerning Shares of the Fund -
      Distribution Plan" below).
3.    The Fund's Distribution Plan provides that it will pay
      distribution/service fees aggregating up to 1.00% per annum of the
      average daily net assets attributable to Class B and Class C shares,
      respectively.  Distribution expenses paid under the Distribution Plan
      with respect to Class B or Class C shares, together with any CDSC, may
      cause long-term shareholders to pay more than the maximum sales charge
      that would have been permissible if imposed entirely as an initial sales
      charge.  (See "Information Concerning Shares of the Fund - Distribution
      Plan" below.)
4.    The Fund has an  expense  offset  arrangement  which  reduces  the  Fund's
      custodian  fee based upon the amount of cash  maintained  by the Fund with
      its custodian and dividend disbursing agent, and may enter into other such
      arrangements and directed  brokerage  arrangements  (which would also have
      the effect of reducing the Fund's expenses). These fee reductions, if any,
      are not reflected under "Other Expenses."
5.    "Other  Expenses" is based on Class A expenses  incurred during the fiscal
      year ended December 31, 1997.

                              Example of Expenses

      An investor would pay the following dollar amounts of expenses on a $1,000
investment in the Fund, assuming (a) a 5%

<PAGE>


annual  return  and  (b)  redemption  at the end of  each  of the  time  periods
indicated (unless otherwise noted):

      Period                    Class A          Class B              Class C

                                                         (1)                 (1)
      1 year................     $  66      $  56      $  16     $  26   $   16
      3 years...............        85         79         49        49       49
      5 years...............       104        104         84        84       84
      10 years..............       162        167(2)     167(2)    185      185
- --------------------
1.   Assumes no redemption.
2.   Class B shares  convert to Class A shares  approximately  eight years after
     purchase; therefore, years nine and ten reflect Class A expenses.

      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.  More complete  descriptions  of the following Fund
expenses are set forth in the following  sections:  (i) varying sales charges on
shares  purchases  -  "Purchases";  (ii)  varying  CDSCs  -  "Purchases";  (iii)
management fees - "Investment Adviser"; and (iv) 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.

                                      ***

2.       MANAGEMENT OF THE FUND - Investment Adviser

         The first and second paragraphs in the section entitled  "Management of
the Fund - Investment  Adviser" on Pages 17 and 18 of the  Prospectus are hereby
revised as follows:

         "Investment  Adviser - The  Adviser  manages  the Fund  pursuant  to an
         Investment Advisory  Agreement,  dated December 15, 1998 (the "Advisory
         Agreement").  Under the Advisory  Agreement,  the Adviser  provides the
         Fund with overall  investment  advisory  services.  John D. Laupheimer,
         Jr.,  a Senior  Vice  President  of the  Adviser,  has been the  Fund's
         portfolio  manager since 1992.  Mitchell D. Dynan,  a Vice President of
         the Adviser, has also been a portfolio manager of the Fund since March,
         1995.  Messrs.  Dynan and  Laupheimer  have been  employed as portfolio
         managers by the Adviser since 1986 and 1981,  respectively.  Subject to
         such  policies  as  the  Trustees  may  determine,  the  Adviser  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 0.33% of the Fund's average daily net assets.  Prior to
         December 15, 1998, the Adviser received a management fee,  computed and
         paid monthly,  fixed by a formula based upon a percentage of the Fund's
         average  daily net assets plus a percentage  of the Fund's gross income
         (i.e.,  income  other than gains from the sale of  securities)  in each
         case on an annualized basis for the Fund's then current fiscal year.

         For the Fund's  fiscal  year ended  December  31,  1997,  MFS  received
         management fees under the Advisory Agreement of $8,764,265,  equivalent
         on an annualized  basis to 0.19% of the Fund's average daily net assets
         (excluding  the  payment  attributable  to certain  property  described
         below).  Management  fees  received  by MFS for the Fund's  fiscal year
         ended December 31, 1997 were  comprised of $6,178,779  based on average
         daily  net  asset  and  $2,585,486  based on gross  investment  income.
         However,  the Advisory  Agreement provides that the compensation of the
         Adviser will be reduced by an annual sum  representing the Fund's share
         of the  fair  value of the use of  office  furniture,  furnishings  and
         equipment purchased over the years with funds furnished by the Fund and
         Massachusetts  Investors  Growth Stock Fund as part of shared expenses.
         The total  annual  use value of this  property  for the  period  ending
         December 31, 1997 has 
<PAGE>
         been  determined  pursuant  to a  formula  devised  by an  independent
         supplier to be $95,243 for the Fund,  which amount was  transferred to
         the Fund by the Adviser.

         The  second  paragraph  of  section  entitled  "Management  of the Fund
Investment  Adviser" on page 10 of the  Statement of Additional  Information  is
revised in its entirety as follows:

         "The  Adviser  manages  the Fund  pursuant  to an  Investment  Advisory
         Agreement,  dated December 15, 1998 (the "Advisory  Agreement").  Under
         the  Advisory  Agreement,  the Adviser  provides  the Fund with overall
         investment advisory services.  Subject to such policies as the Trustees
         may determine, the Adviser makes investment decisions for the Fund. For
         these services and  facilities,  the Adviser  receives a management fee
         computed  and paid  monthly  at an annual  rate of 0.33% of the  Fund's
         average  daily net assets.  Prior to  December  15,  1998,  the Adviser
         received  a  management  fee,  computed  and paid  monthly,  fixed by a
         formula based upon a percentage of the Fund's  average daily net assets
         plus a percentage of the Fund's gross income  (i.e.,  income other than
         gains from the sale of securities) in each case on an annualized  basis
         for the Fund's then current fiscal year.

         Under  the  Advisory   Agreement,   MFS  received  management  fees  of
         $8,764,265,  $5,982,062  and $4,973,977 for fiscal years ended December
         31, 1997, 1996 and 1995, respectively."



               The date of this Supplement is December 15, 1998.



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