EATON VANCE SERIES TRUST
POS AMI, 2000-04-28
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          As filed with the Securities and Exchange Commission on April 28, 2000

                                                      1940 Act File No. 811-2589





                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D. C. 20549



                                    FORM N-1A


                          REGISTRATION STATEMENT UNDER
                        THE INVESTMENT COMPANY ACT OF 1940                 [ X ]

                                 Amendment No. 24                          [ X ]

                            EATON VANCE SERIES TRUST
               (Exact Name of Registrant as Specified in Charter)


          THE EATON VANCE BUILDING, 255 STATE STREET, BOSTON, MA 02109
                    (Address of Principal Executive Offices)


                                 (617) 482-8260
               (Registrant's Telephone Number including Area Code)



                                 Alan R. Dynner
     THE EATON VANCE BUILDING, 255 STATE STREET, BOSTON, MASSACHUSETTS 02109
     -----------------------------------------------------------------------
                     (Name and address of agent for service)



<PAGE>



     Throughout this Registration Statement,  information concerning Tax-Managed
Growth  Portfolio  (the  "Portfolio")  (File No.  811-7409) is  incorporated  by
reference  from  Amendment No. 57 to the  Registration  Statement of Eaton Vance
Mutual Funds Trust (File No. 2-90946 under the Securities Act of 1933 (the "1933
Act") (the "Amendment"),  which was filed electronically with the Securities and
Exchange Commission on March 31, 2000 (Accession No. 0000950156-00-000202).  The
Amendment contains a prospectus and statement of additional  information ("SAI")
for Eaton Vance  Tax-Managed  Growth Fund (the  "Feeder  Fund"),  which  invests
substantially all of its assets in the Portfolio.  Certain investment  practices
and  policies  of the  Feeder  Fund are  substantially  the same as those of the
Portfolio.


                                     PART A

     Responses to Items 1, 2,3,5 and 9 have been  omitted  pursuant to Paragraph
B2.(b) of the General Instructions to Form N-1A.

Item 4. INVESTMENT OBJECTIVES, PRINCIPAL INVESTMENT STRATEGIES AND RELATED RISKS
        ------------------------------------------------------------------------

     (a)  The  Registrant  is  an  open-end  diversified  management  investment
company.  The investment  objective of Capital  Exchange Fund (the "Fund"),  the
sole series of the Registrant,  is to achieve  long-term,  after-tax returns for
its  shareholders  through  investing  in  a  diversified  portfolio  of  equity
securities.  This objective is nonfundamental  but the Trustees intend to submit
any proposed change which would be material to shareholders for approval.

     (b) and (c) The Fund seeks to achieve its investment objective by investing
in the Portfolio.  Registrant  incorporates by reference information  concerning
the  Portfolio's  investment  objective and investment  practices and risks from
"Fund Summary" and  "Investment  Objective and Principal  Policies and Risks" in
the Feeder Fund prospectus.

Item 6.  MANAGEMENT, ORGANIZATION, AND CAPITAL STRUCTURE


     (a)  Registrant   incorporates  by  reference  information  concerning  the
Portfolio's  management from  "Management and  Organization"  in the Feeder Fund
prospectus.


     (b) Capital Stock


     Registrant  incorporates by reference  information  concerning interests in
the Portfolio from "Management and Organization" in the Feeder Fund SAI.


Item 7.  SHAREHOLDER INFORMATION

     (a) Pricing

     The Fund values its shares once on each day the New York Stock Exchange
(the "Exchange") is open for trading,  as of the close of regular trading on the
Exchange  (normally  4:00 p.m.  New York  time).  The Fund's net asset value per
share is determined by its custodian,  Investors  Bank & Trust Company  ("IBT"),
(as agent for the  Registrant)  in the manner  authorized by the Trustees of the
Trust.  Net asset value is computed  by dividing  the value of the Fund's  total
assets, less its liabilities, by the number of Fund shares outstanding.  Because
the Fund  invests  its assets in an interest  in the  Portfolio,  the Fund's net
asset value will reflect the value of its interest in the Portfolio  (which,  in
turn, reflects the underlying value of the Portfolio's assets and liabilities).

                                       A-1

<PAGE>


     Registrant incorporates by reference information concerning the computation
of net asset value and valuation of Portfolio  assets from  "Valuing  Shares" in
the Feeder Fund prospectus.

     (b) Purchase of Fund Shares

     Not applicable. Registrant does not offer shares of the Fund for sale.

     (c) Redemption of Fund Shares


     A  shareholder  has the right to redeem  Fund shares by  delivering  to the
transfer  agent during its business  hours a written  request in good order plus
any share  certificates,  or stock powers if no  certificates  have been issued.
Redemption  will be made  at the  net  asset  value  next  computed  after  such
delivery.  Good order means that all relevant  documents must be endorsed by the
record owner(s) exactly as the shares are registered and the  signature(s)  must
be guaranteed.  You can obtain a signature  guarantee at certain banks,  savings
and loan institutions,  credit unions, securities dealers, securities exchanges,
clearing agencies and registered securities  associations.  In addition, in some
cases,  good order may require the  furnishing  of additional  documentation  if
shares are  registered in the name of a  corporation,  partnership or fiduciary.
Payment  will be made  within  seven days of the  receipt of the  aforementioned
documents.


     In addition to the redemption of shares in the manner  described above, the
Registrant, for the convenience of its shareholders,  has authorized Eaton Vance
to act as its agent in the repurchase of Fund shares.  Eaton Vance will normally
accept orders to repurchase shares by wire or telephone from investment  dealers
for their  customers at the net asset value next  computed  after receipt of the
order by the dealer if such order is  received by Eaton Vance prior to its close
of business that day. It is the dealer's responsibility to transmit promptly the
repurchase order to Eaton Vance. These repurchase  arrangements do not involve a
charge to the  shareholder  by either  the  Registrant  or its  agent;  however,
investment  dealers may make a charge to the  shareholder.  Payment will be made
within  seven days of the receipt of an order to  repurchase  provided  that the
certificates,  or a stock power if no certificates  have been issued,  have been
delivered to the transfer agent in good order as described above.


     The Registrant reserves the right to pay the redemption or repurchase price
of Fund shares in whole or in part by a distribution of portfolio  securities in
lieu of cash if, in the  opinion of  management,  it seems  advisable  to do so;
normally,  when the  redemption  or  repurchase  price equals or exceeds  $2,500
portfolio securities will be used by the Registrant. Any portfolio securities so
distributed would be valued pursuant to the Portfolio's valuation procedures. If
the portfolio  securities so distributed are sold by the redeeming  shareholder,
brokerage  commissions or other transaction costs will be incurred in connection
with such sale.

     The right to redeem  shares of the Fund can be suspended and the payment of
the  redemption  price  deferred  when the  Exchange  is closed  (other than for
customary  weekend and holiday  closings),  during  periods  when trading on the
Exchange is restricted as determined by the Securities  and Exchange  Commission
(the "SEC"), or, to the extent otherwise permitted by the Investment Company Act
of 1940,  as amended (the "1940 Act"),  if an emergency  exists as determined by
the SEC which makes it impracticable for the Portfolio or the Fund to dispose of
its  securities  or value its assets,  or during any other  period  permitted by
order of the SEC for the protection of investors.



                                       A-2
<PAGE>


     (d) Dividends and Distributions

     Distributions from net investment income are paid at least quarterly. These
distributions  are paid in  shares  of the Fund  computed  at net  asset  value,
subject  to an  option  to each  shareholder  to elect  to be paid in cash.  Net
realized long-term capital gains are retained by the Fund as described below.


     (e) Tax Consequence


         Since  the Fund  intends  to  distribute  substantially  all of its net
investment  income to  shareholders,  it is not  expected  that the Fund will be
required to pay any federal income taxes on such income.  However,  shareholders
of the Fund  normally  will have to pay  federal  income  taxes and any state or
local taxes, on distributions from investment income.

     Since the Fund retains any net realized long-term capital gain and pays the
federal tax thereon,  shareholders  include in their personal federal income tax
return their proportionate share of such gains (as allocated by the Portfolio to
the Fund),  take a credit for the payment of taxes  thereon and increase the tax
cost basis of their shares by an amount equal to such gains less the taxes paid.
The Fund  provides  each of its  shareholders  with  information  regarding  the
shareholder's  federal  income  tax  treatment  of  any  undistributed  realized
long-term capital gain retained by the Fund.

     After the end of each calendar year, each shareholder  receives information
for tax purposes regarding the distributions paid during the year and the amount
of  any  distributions   eligible  for  the  dividends  received  deduction  for
corporations.

Item 8.  DISTRIBUTION ARRANGEMENTS

     (a) and (b) Not applicable


     (c)  The  Trustees  of  the  Trust  have   considered  the  advantages  and
disadvantages  of investing the assets of the Fund in the Portfolio,  as well as
the advantages and disadvantages of the two-tier format. Such investment affords
the  potential  for  economies of scale for the Fund and may over time result in
lower expenses.

     Whenever  the Fund as an investor in the  Portfolio is requested to vote on
matters  pertaining  to  the  Portfolio  (other  than  the  termination  of  the
Portfolio's  business,  which may be determined by the Trustees of the Portfolio
without investor  approval),  the Fund will hold a meeting of Fund  shareholders
and will  vote  its  interest  in the  Portfolio  for or  against  such  matters
proportionately to the instructions to vote for or against such matters received
from Fund  shareholders.  The Fund shall vote  shares for which it  receives  no
voting  instructions  in the same proportion as the shares for which it receives
voting instructions.  Other investors in the Portfolio may alone or collectively
acquire sufficient voting interests in the Portfolio to control matters relating
to the  operation  of the  Portfolio,  which may require a Fund to withdraw  its
investment  in the  Portfolio  or take other  appropriate  action.  The fund can
withdraw from the Portfolio at any time.



                                       A-3
<PAGE>


     In the event the Fund  withdraws all of its assets from the  Portfolio,  or
the Board of Trustees of the Registrant determines that the investment objective
of the Portfolio is no longer  consistent  with the investment  objective of the
Fund,  such  Trustees  would  consider  what  action  might be taken,  including
investing  the  assets  of the  Fund in  another  pooled  investment  entity  or
retaining an investment  adviser to manage the Fund's assets in accordance  with
its investment objective. The Fund's investment performance may be affected by a
withdrawal  of all its  assets  (or the  assets of  another  investor)  from the
Portfolio.











































                                       A-4
<PAGE>


                                     PART B

Item 10.  COVER PAGE AND TABLE OF CONTENTS

     Not applicable

Item 11.  FUND HISTORY

     Registrant is a  Massachusetts  business trust  organized on June 24, 1996.
Registrant currently has one series, Capital Exchange Fund.

Item 12.  DESCRIPTION OF THE FUND AND ITS INVESTMENTS AND RISKS
          -----------------------------------------------------

     Registrant is an open-end diversified management investment company.


     Part A contains  information about the investment objective and policies of
the Fund.  This Part B should be read in  conjunction  with Part A.  Capitalized
terms used in this Part B and not otherwise defined have the meanings given them
in Part A.

     Registrant  incorporates by reference additional information concerning the
investment  policies of the  Portfolio  as well as  information  concerning  the
investment  restrictions  of the  Portfolio  from  "Strategies  and  Risks"  and
"Investment  Restrictions"  in the Feeder  Fund SAI.  The Fund is subject to the
same  investment  restrictions  as the  Portfolio.  Registrant  incorporates  by
reference the Portfolio's  portfolio turnover rates from "Financial  Highlights"
in the Feeder Fund prospectus.


Item 13.  MANAGEMENT OF THE FUND


     (a) - (c)  Registrant  incorporates  by  reference  additional  information
concerning the management of the Portfolio from "Management and Organization" in
the Feeder Fund SAI.  Persons  serving as officers and Trustees of the Portfolio
hold the same positions with the  Registrant  except that Duncan W.  Richardson,
who is a Vice  President of the  Portfolio is not an officer of the  Registrant.
Thomas E. Faust,  Jr. (41) is a Vice President of the  Registrant.  Mr. Faust is
Executive  Vice  President  of BMR and Eaton  Vance and an  officer  of  various
investment  companies  managed by Eaton  Vance or BMR.  The Board of Trustees of
Registrant has the same committees  with the same  composition as the committees
of the Portfolio's Board.

     (d) The fees and  expenses  of those  Trustees  of the  Registrant  and the
Portfolio  who are not  members of the Eaton  Vance  organization  noninterested
Trustees)  are paid by the  Registrant  and the  Portfolio,  respectively.  (The
Trustees of the  Registrant and the Portfolio who are members of the Eaton Vance
organization  receive no compensation from the Registrant or the Portfolio.) For
the fiscal year ended  December  31,  1999,  the  noninterested  Trustees of the
Registrant  and  the  Portfolio  earned  the  following  compensation  in  their
capacities  as  Trustees  from the Fund and the  Portfolio.  For the year  ended
December 31, 1999, the noninterested  Trustees earned the following compensation
from all of the funds in the Eaton Vance fund complex (1)



                                       B-1

<PAGE>
<TABLE>
<CAPTION>
<S>                                 <C>            <C>           <C>             <C>            <C>


                                 Jessica M.     Donald R.        Samuel L.      Norton H.      Jack L.
                                 BIBLIOWICZ      DWIGHT          HAYES, III      Reamer        TREYNOR
Capital Exchange Fund             $1,939         $1,886             $1,927       $1,782         $1,944
Aggregate from the                 7,088          6,188(2)(a)        6,806        6,401          7,073
Portfolio
Total Compensation from          160,000        160,000(2)(b)      170,000      160,000        170,000
Registrant and Complex
</TABLE>


(1) As of  April  1,  2000,  the  Eaton  Vance  fund  complex  consisted  of 143
registered  investment  companies  or  series  thereof.
(2) Includes deferred compensation as follows: (2)(a) $3,285; (2)(b) $60,00    0

     Trustees  of the  Portfolio  that are not  affiliated  with its  investment
adviser,  BMR, may elect to defer receipt of all or a percentage of their annual
fees in accordance with the terms of a Trustees Deferred  Compensation Plan (the
"Trustees'  Plan").  Under the Trustees' Plan, an eligible  Trustee may elect to
have his deferred  fees  invested by the  Portfolio in the shares of one or more
funds in the Eaton Vance  Family of Funds,  and the amount paid to the  Trustees
under the Trustees' Plan will be determined  based upon the  performance of such
investments.  Deferral of Trustees'  fees in accordance  with the Trustees' Plan
will have a negligible effect on the Portfolio's  assets,  liabilities,  and net
income,  and will not  obligate  the  Portfolio  to retain the  services  of any
Trustee or obligate the Portfolio to pay any particular level of compensation to
the Trustee.  Neither the Registrant nor the Portfolio has a retirement plan for
Trustees.

     (f) Code of Ethics


     The Registrant and the Portfolio and its investment adviser have
adopted Codes of Ethics governing  personal  securities  transactions  Under the
Codes,  employees of the investment  adviser and its affiliates may purchase and
sell securities  (including securities held by the portfolio) subject to certain
pre-clearance and reporting requirements and other procedures.


Item 14.  CONTROL PERSONS AND PRINCIPAL HOLDERS OF SECURITIES


     (a) - (c) As of April 1, 2000, the Trustees and officers of the Registrant,
as a group,  owned in the aggregate  less than 1% of the  outstanding  shares of
each  Fund.  To  the  knowledge  of  the  Registrant  no  person  of  record  or
beneficially owned 5% or more of a Fund's shares, as of April 1, 2000.


Item 15.  INVESTMENT ADVISORY AND OTHER SERVICES


     (a)  and  (c)  -  (h)  Registrant  incorporates  by  reference  information
concerning investment advisory and other services provided to the Portfolio from
"Investment Advisory and Administrative  Services" and "Other Service Providers"
in the  Feeder  Fund  SAI.  Eaton  Vance  serves as  administrator  of the Fund,
providing the Fund with  administrative  services and related office facilities.
Eaton Vance does not currently receive a fee for serving as administrator.


     (b) Not applicable



                                       B-2

<PAGE>


Item 16.  BROKERAGE ALLOCATION AND OTHER PRACTICES.
          -----------------------------------------

     Registrant  incorporates by reference information  concerning the brokerage
practices of, and brokerage  commissions  paid by, the Portfolio from "Portfolio
Security Transactions" in the Feeder Fund SAI.

Item 17.  CAPITAL STOCK AND OTHER SECURITIES

     (a) The  Registrant  may issue an unlimited  number of shares of beneficial
interest (no par value per share) in one or more series (such as the Fund). Each
share of the Fund represents an equal  proportionate  beneficial interest in the
Fund. When issued and outstanding,  the shares are fully paid and  nonassessable
by the Trust.  Shareholders  are  entitled to one vote for each full share held.
Fractional  shares may be voted  proportionately.  Shares have no  preemptive or
conversion rights and are freely  transferable.  In the event of the liquidation
of the Fund,  shareholders  are  entitled to share pro rata in the net assets of
the Fund available for distribution to shareholders.

     The Declaration of Trust may be amended by the Trustees when authorized
by a majority of the outstanding  voting securities of the Trust affected by the
amendment. The Trustees may also amend the Declaration of Trust without the vote
or consent of  shareholders  to change the name of the Trust or any series or to
make such other changes as do not have a materially adverse effect on the rights
or  interests  of  shareholders  or if they deem it  necessary  to  conform  the
Declaration to the  requirements  of federal laws or state laws or  regulations.
The Trust or any series may be terminated  by: (1) the  affirmative  vote of the
holders of not less than  two-thirds of the shares  outstanding  and entitled to
vote at any meeting of shareholders of the Trust or the appropriate  series,  or
by an instrument or  instruments in writing  without a meeting,  consented to by
the  holders of  two-thirds  of the  shares of the Trust or a series,  provided,
however, that, if such termination is recommended by the Trustees, the vote of a
majority of the outstanding  voting securities of the Trust or a series entitled
to vote  thereon  shall  be  sufficient  authorization;  or (2) by  means  of an
instrument in writing signed by a majority of the Trustees,  to be followed by a
written  notice to  shareholders  stating  that a majority of the  Trustees  has
determined  that the  continuation  of the  Trust or a series is not in the best
interest of the Trust, or such series or of their respective shareholders.

     As permitted by  Massachusetts  law,  there will normally be no meetings of
shareholders for the purpose of electing  Trustees unless and until such time as
less than a majority  of the  Trustees  of the Trust  holding  office  have been
elected by shareholders.  In such an event the Trustees then in office will call
a shareholder's  meeting for the election of Trustees.  Except for the foregoing
circumstances  and unless  removed by action of the  shareholders  in accordance
with the Trust's  By-Laws,  the Trustees  shall  continue to hold office and may
appoint successor Trustees.

     The  Declaration  of Trust  further  provides that the Trustees will not be
liable for errors of judgment  or  mistakes  of fact or law;  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.  In addition,  the By-laws of the Trust  provide that no natural  person
shall  serve as a Trustee of the Trust  after the  holders of record of not less
than two-thirds of the outstanding  shares have declared that he be removed from
office either by declaration in writing filed with the custodian of the assets


                                       B-3

<PAGE>

of the Trust or by votes set in person or by proxy at a meeting  called  for the
purpose.  The By-laws  further  provide  that under  certain  circumstances  the
shareholders  may call a  meeting  to  remove a  Trustee  and that the  Trust is
required to provide  assistance in communicating  with shareholders about such a
meeting.  The By-laws  also  provide that the  Trustees  shall  promptly  call a
meeting of shareholders  for the purpose of voting upon a question of removal of
a Trustee when  requested to do so by the record holders of not less than 10 per
centum of the outstanding shares.

     Under Massachusetts law, if certain conditions  prevail,  shareholders of a
Massachusetts  business  trust  (such  as the  Trust)  could be  deemed  to have
personal  liability  for  the  obligations  of the  Trust.  Numerous  investment
companies  registered  under  the 1940 Act have  been  formed  as  Massachusetts
business trusts, and management is not aware of an instance where such liability
has  been  imposed.  The  Trust's  Declaration  of  Trust  contains  an  express
disclaimer of liability on the part of Fund shareholders and the Trust's By-laws
provide  that  the  Trust  shall  assume  the  defense  on  behalf  of any  Fund
shareholders.  (The Declaration also contains  provisions limiting the liability
of a series or class to that series or class).  Moreover,  the  Trust's  By-laws
also  provide  for  indemnification  out of the  property  of  the  Fund  of any
shareholder  held  personally  liable solely by reason of being or having been a
shareholder for all loss or expense  arising from such liability.  The assets of
the Fund will ordinarily  substantially exceed its liabilities.  In light of the
nature of the Fund's business and the nature of its assets,  management believes
that the  possibility  of the  Fund's  liabilities  exceeding  its  assets,  and
therefore the shareholder's risk of personal liability, is extremely remote.

     (b) Not applicable

Item 18.  PURCHASE, REDEMPTION AND PRICING

     (a) and (b) The Registrant does not offer shares of the Fund for sale.

     (c) Registrant  incorporates by reference information  concerning valuation
of the Portfolio's assets from "Purchasing and Redeeming Shares - Calculation of
Net Asset Value" in the Feeder Fund SAI.




                                       B-4

<PAGE>



Item 19.  TAXATION OF THE FUND

     The Fund, as a series of a Massachusetts business trust, will be treated as
a  separate  entity  for  accounting  and tax  purposes.  The  Fund  has met the
requirements  of subchapter M for the taxable year ending  December 31, 1999 and
intends to meet such requirements for the taxable year ending December 31, 2000.
Accordingly,  the Fund  intends  to satisfy  certain  requirements  relating  to
sources of its income and diversification of its assets and to distribute all of
its net investment income in accordance with the timing requirements  imposed by
the Code,  so as to avoid any federal  income or excise tax on such income.  The
Fund's  treatment of net realized  long-term  capital gains is discussed  below.
Because the Fund invests its assets in the  Portfolio,  the  Portfolio  normally
must satisfy the applicable source of income and diversification requirements in
order  for the Fund to  satisfy  them.  The  Portfolio  will  allocate  at least
annually among its investors,  including the Fund, each investor's  distributive
share of the  Portfolio's  net investment  income and any other items of income,
gain, loss,  deduction or credit (other than net realized long-term capital gain
which is discussed  below).  The Portfolio will make allocations to each Fund in
accordance  with the Code  and  applicable  regulations  and  will  make  moneys
available for  withdrawal  at  appropriate  times and in  sufficient  amounts to
enable the Fund to satisfy the tax distribution  requirements  that apply to the
Fund and that must be satisfied in order to avoid  federal  income and/or excise
tax on the Fund. For purposes of applying the requirements of the Code regarding
qualification  as a RIC,  each Fund will be deemed (i) to own its  proportionate
share of each of the  assets of the  Portfolio  and (ii) to be  entitled  to the
gross income of the Portfolio attributable to such share.


     Allocated net realized long-term capital gains are normally retained by the
Fund,  and the  Fund  pays the  federal  tax  thereon.  When  this is done,  the
shareholder  includes in his personal income tax return his proportionate  share
of such gains (as  allocated by the  Portfolio to the Fund),  takes a credit for
the payment of taxes thereon,  and increases the tax cost basis of his shares by
an amount equal to such gains less the taxes paid. Due to regulations imposed by
the  Internal  Revenue  Service the  Registrant  is required to  distribute  net
realized  long-term  capital gains (computed on the basis of the one-year period
ending on October 31 of such year) and 100% of any income from the present  year
that was not paid out during such year and on which the Fund was not taxed.  The
Registrant  therefore  reserves the right to distribute  such capital gains when
required.  Certain distributions,  if declared in October,  November or December
and paid the following January,  will be taxed to shareholders as if received on
December 31 of the year in which they are declared.

     In order to avoid federal excise tax, the Code requires that the Fund
distribute  (or be deemed to have  distributed)  by December 31 of each calendar
year at least 98% of its ordinary income (not including  tax-exempt  income) for
such year,  at least 98% of the excess of its  realized  capital  gains over its
realized capital losses,  generally computed on the basis of the one-year period
ending on October 31 of such year, after reduction by any available capital loss
carryforwards,  and 100% of any income and capital gains from the prior year (as
previously  computed)  that was not paid out  during  such year and on which the
Fund was not taxed. Further, under current law, provided that the Fund qualifies
as a RIC for  federal  income tax  purposes  and the  Portfolio  is treated as a
partnership for Massachusetts and federal tax purposes, neither the Fund nor the
Portfolio is liable for any income,  corporate  excise or  franchise  tax in the
Commonwealth of Massachusetts.



                                       B-5

<PAGE>

Foreign exchange gains and losses realized by the Portfolio and allocated to the
Fund in connection  with the Portfolio's  investments in foreign  securities and
certain options, futures or forward contracts or foreign currency may be treated
as ordinary income and losses under special tax rules. Certain options,  futures
or forward  contracts  of the  Portfolio  may be required to be marked to market
(i.e.,  treated as if closed out) on the last day of each taxable year,  and any
gain or loss  realized  with  respect to these  contracts  may be required to be
treated as 60%  long-term  and 40%  short-term  gain or loss.  Positions  of the
Portfolio  in  securities  and  offsetting  options,  swaps,  futures or forward
contracts  may be treated as  "straddles"  and be subject to other special rules
that may, upon allocation of the Portfolio's  income,  gain or loss to the Fund,
affect  the  amount,  timing  and  character  of  the  Fund's  distributions  to
shareholders.  Certain uses of foreign currency and foreign currency derivatives
such as options,  futures,  forward  contracts  and swaps and  investment by the
Portfolio in certain "passive foreign investment  companies" may be limited or a
tax  election  may be  made,  if  available,  in order to  preserve  the  Fund's
qualification as a RIC or avoid imposition of a tax on the Fund.

     The Portfolio will allocate at least annually to the Fund and its other
investors their respective  distributive shares of any net investment income and
net capital  gains which have been  recognized  for federal  income tax purposes
(including unrealized gains at the end of the Portfolio's fiscal year on certain
options and futures transactions that are required to be marked-to-market). Such
amounts  (except as  described  above)  will be  distributed  by the Fund to its
shareholders in cash or additional  shares,  as they elect.  Shareholders of the
Fund will be advised of the nature of the distributions.

     Certain investors in the Portfolio, including the Fund and other RICs, have
acquired  interests in the  Portfolio  by  contributing  securities.  Due to tax
considerations,  during the first  seven years  following  the  contribution  of
securities  to  the  Portfolio  by  an  investor   (five  years  for  securities
contributed  prior to June 9, 1997),  such securities will not be distributed to
any investor other than the investor who contributed those securities. Investors
who acquire an interest in the  Portfolio  by  contributing  securities  and who
redeem that interest within the applicable time period thereafter will generally
receive  back  one or  more  of the  securities  they  contributed.  In  partial
redemptions by such investors during this period,  the Portfolio will attempt to
accommodate  requests to distribute  initially those contributed  securities and
share lots with the highest cost basis.

     The Portfolio has  significant  holdings of highly  appreciated  securities
that were contributed to the Portfolio by investors other than the Fund. If such
securities  were to be sold,  the  resulting  capital  gain  would be  allocated
disproportionately  among the  Portfolio's  investors,  with the result that the
Fund  would  not be  subject  to  taxation  on any  gain  arising  prior  to the
contribution of the securities to the Portfolio.  If any appreciated  securities
to be contributed  to the Portfolio by the Fund are sold, the resulting  capital
gain would be allocated to the Fund.

     Any loss  realized  upon the  redemption  or  exchange of shares with a tax
holding  period of 6 months or less will be treated as a long-term  capital loss
to the extent of any distribution of net long-term capital gains with respect to
such shares.  All or a portion of a loss realized upon a taxable  disposition of
Fund shares may be  disallowed  under "wash sale" rules if other Fund shares are
purchased  (whether  through  reinvestment or dividends or otherwise)  within 30
days  before or after the  disposition.  Any  disallowed  loss will result in an
adjustment  to the  shareholder's  tax basis in some or all of the other  shares
acquired.



                                       B-6

<PAGE>

     Amounts paid by the Fund to individuals and certain other  shareholders who
have not provided the Fund with their correct taxpayer identification number and
certain required  certifications,  as well as shareholders  with respect to whom
the Fund has  received  notification  from the  Internal  Revenue  Service  or a
broker,  may be subject to "backup"  withholding  of federal income tax from the
Fund's  taxable  dividends  and  distributions  and the proceeds of  redemptions
(including repurchases and exchanges) at a rate of 31%. An individual's taxpayer
identification number is generally his or her social security number.


     Shareholders should consult their own tax advisers with respect to these or
other special tax rules that may apply in their particular  situations,  as well
as the state, local or foreign tax consequences of investing in the Fund.


     The foregoing discussion does not describe many of the tax rules applicable
to IRAs nor does it address the special tax rules  applicable  to certain  other
classes of  investors,  such as other  retirement  plans,  tax-exempt  entities,
insurance  companies and financial  institutions.  Shareholders  should  consult
their own tax advisers with respect to these or other special tax rules that may
apply in their particular situations, as well as the state, local or foreign tax
consequences of investing in the Fund.

Item 20.  UNDERWRITERS

     Not applicable  because  Registrant does not make a continuous  offering of
Fund shares.

Item 21.  CALCULATION OF PERFORMANCE DATA

     Not applicable.

Item 22.  FINANCIAL STATEMENTS


     Registrant  incorporates  by  reference  the  following  audited  financial
information for the Fund and the Portfolio  contained in the Fund's  shareholder
report  for  the  fiscal  year  ended  December  31,  1999 as  previously  filed
electronically  with the SEC in an N-30D filing made on March 16, 2000  pursuant
to  Section  30(b)  (2)  of  the   Investment   Act  of  1940)   (Accession  No.
0000912057-00-011892).




                                       B-7

<PAGE>


For the Fund:
                  Statement of Assets and Liabilities as of December 31, 1999
                  Statement of Operations as of December 31, 1999
                  Statement  of Changes in Net Assets for the fiscal  year ended
                  December 31, 1999,  the period ended December 31, 1998 and the
                  fiscal year ended October 31, 1998  Financial  Highlights  for
                  the fiscal year ended  December  31,  1999,  the period  ended
                  December 31, 1998,  and for the fiscal years ended October 31,
                  1998,  1997,  1996 and  1995  Notes  to  Financial  Statements
                  Independent Auditor's Report

For the Portfolio:
                  Portfolio of  Investments as of December 31, 1999 Statement of
                  Assets and  Liabilities  as of December 31, 1999  Statement of
                  Operations as of December 31, 1999
                  Statement  of Changes in Net Assets for the fiscal  year ended
                  December 31, 1999,  the period ended December 31, 1998 and the
                  fiscal year ended October 31, 1998  Supplementary Data for the
                  fiscal year ended  December  31,  1999,  for the period  ended
                  December 31, 1998 and for the fiscal  years ended  October 31,
                  1998 and 1997 and for the  period  from the start of  business
                  December  1,  1995 to  October  31,  1996  Notes to  Financial
                  Statements Independent Auditor's Report



                                       B-8
<PAGE>


                                     PART C

                                OTHER INFORMATION

Item 23.  EXHIBITS

         (a) (1)    Declaration of Trust of the Registrant  dated June 24, 1996,
                    filed as Exhibit (1) to  Amendment  No. 19 and  incorporated
                    herein by reference.

              (2)   Amendment and Restatement of  Establishment  and Designation
                    of Series of Shares dated  October 19, 1998 filed as Exhibit
                    (a)(2)  to  Amendment  No.  23 and  incorporated  herein  by
                    reference.

         (b)        By-laws  of the  Registrant  dated June 24,  1996,  filed as
                    Exhibit (2) to Amendment No. 19 and  incorporated  herein by
                    reference.

         (c)        Not Applicable

         (d)        Not Applicable

         (e)        Not Applicable

         (f)        The  Securities  and  Exchange  Commission  has  granted the
                    Registrant an exemptive order that permits the Registrant to
                    enter  into  deferred  compensation  arrangements  with  its
                    independent Directors. See in the Matter of Capital Exchange
                    Fund, Inc., Release No. IC-20671 (November 1, 1994).

         (g) (1)    Custodian  Agreement dated August 30, 1996, filed as Exhibit
                    (8)  to  Amendment  No.  19  and   incorporated   herein  by
                    reference.

              (2)   Amendment to Master Custodian  Agreement with Investors Bank
                    & Trust  Company  dated  December  21, 1998 filed as Exhibit
                    (g)(3)  to  the   Registration   Statement  of  Eaton  Vance
                    Municipals Trust (File Nos. 33-572, 811-4409) (Accession No.
                    0000950156-99-000050) and incorporated herein by reference.

         (h) (1)    Administrative   Services   Agreement   with   Eaton   Vance
                    Management  dated August 30,  1996,  filed as Exhibit (9) to
                    Amendment No. 19 and incorporated herein by reference.

              (2)   Transfer  Agency  Agreement dated January 1, 1998 with First
                    Data Investor  Services Group,  Inc. filed as Exhibit (k)(b)
                    to the  Registration  Statement  on Form N-2 of Eaton  Vance
                    Advisers  Senior-Floating Rate Fund (File Nos. 333-46853 and
                    811-08671)   (Accession   No.    0000950156-98-000172)   and
                    incorporated herein by reference.

         (i)        Not Applicable

         (j)        Not Applicable



                                       C-1

<PAGE>

         (k)       Not Applicable

         (l)       Not Applicable

         (m)       Not Applicable

         (n)       Not Applicable

         (o)       Not Applicable


         (r)       Code of Ethics  adopted  by the Eaton  Vance  Group of Funds
                   effective May 1, 1981 as amended  February 21, 1995 filed as
                   Exhibit (r) to the Registration  Statement on Form N-2 of EV
                   Classic  Senior  Floating-Rate  Fund (File  Nos.  333-32262,
                   811-07945)  (Accession  No.  0000950156-00-000169)  filed on
                   March 13, 2000, and incorporated herein by reference.


Item 24.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT
          -------------------------------------------------------------

     Not Applicable

Item 25.  INDEMNIFICATION

     Article IV of the  Registrant's  Declaration  of Trust permits  Trustee and
officer  indemnification by By-law, contract and vote. Article XI of the By-Laws
contains  indemnification  provisions.  Registrant's  Trustees  and officers are
insured  under a standard  mutual fund  errors and  omissions  insurance  policy
covering loss incurred by reason of negligent errors and omissions  committed in
their capacities as such.

Item 26.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

     Registrant incorporates herein by reference the information set forth under
the caption  "Investment  Advisory and Administrative  Services" from the Feeder
Fund's SAI.

Item 27.  PRINCIPAL UNDERWRITERS

     Not applicable  because  Registrant does not make a continuous  offering of
its shares.

Item 28.  LOCATION OF ACCOUNTS AND RECORDS


     All applicable accounts,  books, and documents required to be maintained by
Registrant by Section 31(a) of the Investment  Company Act of 1940 and the Rules
promulgated  thereunder are in the  possession  and custody of the  Registrant's
custodian,  Investors Bank & Trust Company,  200 Clarendon  Street,  Boston,  MA
02116,  and the  Registrant's  transfer agent,  PFPC, Inc., 4400 Computer Drive,
Westborough, MA 01581-5120 with the exception of certain corporate documents and
portfolio  trading  documents as prescribed and listed in Rules  31a-1(b),  (4),
(5), (6), (7), (9),  (10),  and (11) which are in the  possession and custody of
the  Registrant's  Treasurer  at The Eaton  Vance  Building,  255 State  Street,
Boston,   Massachusetts  02109.  Registrant  is  informed  that  all  applicable
accounts, books and documents required to be maintained by registered investment
advisers  are in the  custody  and  possession  of  the  Portfolio's  investment
adviser, BMR, The Eaton Vance Building, 255 State Street, Boston,  Massachusetts
02109.


                                       C-2

<PAGE>


Item 29.  MANAGEMENT SERVICES

     Not Applicable

Item 30.  UNDERTAKINGS

     Not Applicable











































                                       C-3

<PAGE>


                                    SIGNATURE


     Pursuant to the  requirements  of the  Investment  Company Act of 1940, the
Registrant  as duly  caused  this  Amendment  to be signed on its  behalf by the
undersigned, thereunto duly authorized in the City of Boston and Commonwealth of
Massachusetts, on the 28th day of April, 2000.



                    EATON VANCE SERIES TRUST



                    By: /s/ James L. O'Connor
                    ------------------------------------------------------------
                            James L. O'Connor, Treasurer






                                       C-4
<PAGE>

                                  EXHIBIT INDEX


The following exhibits are filed as part of this Registration Statement.



EXHIBIT NO.       DESCRIPTION









































                                       C-5


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