PIONEER THREE
485APOS, 1995-12-01
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                                                               File Nos. 2-79140
                                                                        811-3564
    

      As Filed with The Securities and Exchange Commission December 1, 1995

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    FORM N-1A

         REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 /_X__/


                         Pre-Effective Amendment No. ___        /____/

   
                         Post-Effective Amendment No. 20        /_X__/
    

                                     and/or

             REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT
                                    OF 1940                     / X  / 

   
                         Amendment No. 20                       /_X _/
    
                                                                
                        (Check appropriate box or boxes)

                               PIONEER THREE
               (Exact name of registrant as specified in charter)

                  60 State Street, Boston, Massachusetts 02109
                (Address of principal executive office) Zip Code
                                    

       Registrant's Telephone Number, including Area Code: (617) 742-7825

        Joseph P. Barri, Hale and Dorr, 60 State Street, Boston, MA 02109
                     (Name and address of agent for service)

It is proposed that this filing will become effective:

   
       _X_      on February 1, 1996 pursuant to paragraph (a) of Rule 485
 
Registrant  has  registered  an  indefinite   amount  of  securities  under  the
Securities Act of 1933 pursuant to Section 24(f) of the  Investment  Company Act
of 1940.  Registrant  filed a Rule  24f-2  Notice  for its  fiscal  year  ending
September 30, 1995 on November 29, 1995.
    


<PAGE>
                                  PIONEER THREE

       Cross-Reference Sheet Showing Location in Prospectus and Statement
          of Additional Information of Information Required by Items of
                              the Registration Form

                                                 Location in Prospectus
                                                 or Statement of
Form N-1A Item Number and Caption                Additional Information

1.   Cover Page............................      Prospectus - Cover Page

2.   Synopsis..............................      Prospectus - Expense
                                                 Information

3.   Condensed Financial Information.......      Prospectus - Financial 
                                                 Highlights

4.   General Description of Registrant.....      Prospectus - Investment 
                                                 Objectives and Policies;
                                                 Management of the Fund; 
                                                 Information About Fund Shares

5.   Management of the Fund................      Prospectus - Management of the
                                                 Fund

6.   Capital Stock and Other Securities....      Prospectus - Investment 
                                                 Objectives and Policies; 
                                                 Information About Fund Shares

7.   Purchase of Securities Being Offered..      Prospectus - Information About
                                                 Fund Shares; Distribution Plan;
                                                 Shareholder Services

8.   Redemption or Repurchase..............      Prospectus - Information About
                                                 Fund Shares; Shareholder
                                                 Services

9.   Pending Legal Proceedings.............      Not Applicable

10.  Cover Page............................      Statement of Additional 
                                                 Information - Cover Page

11.  Table of Contents.....................      Statement of Additional
                                                 Information - Cover Page
<PAGE>
                                                 Location in Prospectus
                                                 or Statement of
Form N-1A Item Number and Caption                Additional Information


12.  General Information and History.......      Statement of Additional 
                                                 Information - Cover Page; 
                                                 Description of Shares

13.  Investment Objectives and Policies....      Statement of Additional 
                                                 Information - Investment 
                                                 Policies and Restrictions

14.  Management of the Fund................      Statement of Additional 
                                                 Information - Management of the
                                                 Fund; Investment Adviser

15.  Control Persons and Principal Holders
       of Securities.......................      Statement of Additional 
                                                 Information - Management of the
                                                 Fund

16.  Investment Advisory and Other
       Services............................      Statement of Additional 
                                                 Information - Management of the
                                                 Fund; Investment Adviser; 
                                                 Shareholder Servicing/Transfer
                                                 Agent; Custodians; Independent
                                                 Accountant

17.  Brokerage Allocation and Other
       Practices...........................      Statement of Additional 
                                                 Information - Portfolio 
                                                 Transactions

18.  Capital Stock and Other Securities....      Statement of Additional 
                                                 Information - Description of 
                                                 Shares; Certain Liabilities


19.  Purchase, Redemption and Pricing of
       Securities Being Offered............      Statement of Additional 
                                                 Information - Determination of
                                                 Net Asset Value; Letter of 
                                                 Intention; Systematic 
                                                 Withdrawal Plan
<PAGE>
                                                 Location in Prospectus
                                                 or Statement of
Form N-1A Item Number and Caption                Additional Information

20.  Tax Status............................      Statement of Additional 
                                                 Information - Tax Status

21.  Underwriters..........................      Statement of Additional
                                                 Information - Principal 
                                                 Underwriter; Distribution Plan

22.  Calculation of Performance Data.......      Statement of Additional 
                                                 Information - Investment 
                                                 Results

23.  Financial Statements..................      Statement of Additional
                                                 Information - Cover Page


<PAGE>


   
Pioneer Mid-Cap
Fund


Class A, Class B and Class C Shares
Prospectus
February 1, 1996

Pioneer  Mid-Cap  Fund (the  "Fund")  seeks  capital  growth by  investing  in a
diversified  portfolio of securities  consisting primarily of common stocks. Any
current income  generated from these  securities is incidental to the investment
objective of the Fund.

In order to achieve its investment objective,  the Fund will invest at least 65%
of its total  assets in common  stocks and  common  stock  equivalents  (such as
convertible bonds and preferred stock) of companies with a market capitalization
of less than $5 billion ("Mid-Cap Companies").  The Fund may invest a portion of
its assets in foreign  securities.  See  "Investment  Objective and Policies" in
this  Prospectus.  There is, of course,  no assurance that the Fund will achieve
its investment objective.

FUND  RETURNS AND SHARE  PRICES  FLUCTUATE  AND THE VALUE OF YOUR  ACCOUNT  UPON
REDEMPTION MAY BE MORE OR LESS THAN YOUR PURCHASE PRICE.  SHARES IN THE FUND ARE
NOT DEPOSITS OR OBLIGATIONS  OF, OR GUARANTEED OR ENDORSED BY, ANY BANK OR OTHER
DEPOSITORY INSTITUTION,  AND THE SHARES ARE NOT FEDERALLY INSURED BY THE FEDERAL
DEPOSIT INSURANCE CORPORATION, THE FEDERAL RESERVE BOARD OR ANY OTHER GOVERNMENT
AGENCY.  INVESTMENTS  IN THE  SECURITIES OF MID-CAP  COMPANIES MAY OFFER GREATER
CAPITAL APPRECIATION POTENTIAL THAN INVESTMENTS IN LARGE-CAPITALIZATION  COMPANY
SECURITIES,  BUT MAY BE SUBJECT TO GREATER  SHORT-TERM PRICE  FLUCTUATIONS.  THE
FUND IS INTENDED  FOR  INVESTORS  WHO CAN ACCEPT THE RISKS  ASSOCIATED  WITH ITS
INVESTMENTS  AND  MAY  NOT  BE  SUITABLE  FOR  ALL  INVESTORS.  SEE  "INVESTMENT
OBJECTIVES AND POLICIES" FOR A DISCUSSION OF THESE RISKS.

This Prospectus  (Part A of the  Registration  Statement)  provides  information
about the Fund that you should know before investing.  Please read and retain it
for your future  reference.  More information about the Fund is included in Part
B, the Statement of Additional  Information,  also dated February 1, 1996, which
is incorporated  into this  Prospectus by reference.  A copy of the Statement of
Additional  Information  may be  obtained  free of charge by calling  Shareowner
Services at 1-800-225-6292 or by written request to the Fund at 60 State Street,
Boston,  Massachusetts  02109.  Additional  information  about the Fund has been
filed with the Securities and Exchange  Commission  (the "SEC") and is available
upon request and without charge.


<PAGE>



          TABLE OF CONTENTS                                             PAGE
- -------------------------------------------------------------------------------
I.        EXPENSE INFORMATION .........................................
II.       FINANCIAL HIGHLIGHTS ........................................
III.      INVESTMENT OBJECTIVE AND POLICIES ...........................
             Risk Factors .............................................
IV.       MANAGEMENT OF THE FUND ......................................
V.        FUND SHARE ALTERNATIVES .....................................
VI.       SHARE PRICE .................................................
VII.      HOW TO BUY FUND SHARES ......................................
             Class A Shares ...........................................
             Class B Shares............................................
             Class C Shares............................................
VIII.     HOW TO SELL FUND SHARES .....................................
IX.       HOW TO EXCHANGE FUND SHARES .................................
X.        DISTRIBUTION PLANS ..........................................
XI.       DIVIDENDS, DISTRIBUTIONS AND TAXATION .......................
XII.      SHAREOWNER SERVICES .........................................
             Account and Confirmation Statements ......................
             Additional Investments ...................................
             Automatic Investment Plans ...............................
             Financial Reports and Tax Information ....................
             Distribution Options .....................................
             Directed Dividends .......................................
             Direct Deposit ...........................................
             Voluntary Tax Withholding ................................
             Telephone Transactions and Related Liabilities ...........
             FactFoneSM................................................
             Retirement Plans .........................................
             Telecommunications Device for the Deaf (TDD) .............
             Systematic Withdrawal Plans ..............................
             Reinstatement Privilege (Class A Only) ...................
XIII.     THE FUND ....................................................

XIV.      INVESTMENT RESULTS ..........................................
          APPENDIX--CERTAIN INVESTMENT PRACTICES ......................
                               ------------------

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

                               [End of Cover Page]

<PAGE>

I. EXPENSE INFORMATION

The table is designed to help you  understand the charges and expenses that you,
as a shareholder,  will bear directly or indirectly when you invest in the Fund.
The information in the table is an estimate based on actual expenses for Class A
shares  for the year  ended  September  30,  1995.  No Class B or C shares  were
outstanding  during  such  period.  Management  fees for each  Class  have  been
restated to reflect the maximum,  basic and minimum  fees payable to  Pioneering
Management  Corporation  ("PMC")  under the most  recently  approved  management
contract.  See  "Management  of the  Fund."  Actual  management  fees and  total
operating  expenses  with  respect to Class A shares  for the fiscal  year ended
September 30, 1995 were .46% and .85%,  respectively under a management contract
previously in effect.
<TABLE>
<CAPTION>

Shareowner Transaction Expenses:                                        Class A       Class B+   Class C+
 <S>                                                                     <C>            <C>      <C>    
 Maximum Initial Sales Charge on
    Purchases (as a percentage of offering price)                        5.75%1         None     None
 Maximum Sales Charge on Reinvestment
    of Dividends                                                         None           None     None
 Maximum Deferred Sales Charge                                           None1          4.00%    1.00%
  (as a percentage of original purchase
   price or redemption proceeds, as applicable)
 Redemption Fee2                                                         None           None     None
 Exchange Fee                                                            None           None     None

Annual Fund Operating Expenses
         (As a Percentage of Average Net Assets):
</TABLE>

<TABLE>
<CAPTION>

                                                                   Management Fee3
                                                              Basic   Maximum  Minimum

Class A

<S>                                                     <C>          <C>          <C>
Management Fee                                          .625         .825         .425
12b-1 Fees                                               .18          .18          .18
Other Expenses (including                                .21          .21          .21
 accounting and transfer agent
 fees, custodian fees and
 printing expenses)

Total Operating Expenses                                1.02         1.22          .82

                                      -3-
<PAGE>

Class B

Management Fee                                          .625         .825         .425
12b-1 Fees                                              1.00         1.00         1.00
Other Expenses (including                                .21          .21          .21
 accounting and transfer agent
 fees, custodian fees and
 printing expenses)

Total Operating Expenses                                1.84         2.04         1.64

Class C

Management Fee                                          .625         .825         .425
12b-1 Fees                                              1.00         1.00         1.00
Other Expenses (including
 accounting and transfer agent
 fees, custodian fees and
 printing expenses)                                      .21          .21          .21
                                                         ---         ----          ---

Total Operating Expenses                                1.84         2.04         1.64

<FN>

+ Class B and Class C shares will first be offered on January 31, 1996.

(1) Purchases of $1,000,000  or more and  purchases by  participants  in certain
group plans are not subject to an initial  sales  charge but may be subject to a
contingent  deferred sales charge as further  described  under "How to Sell Fund
Shares."

(2) Separate fees  (currently $10 and $20,  respectively)  apply to domestic and
international wire transfers of redemption proceeds.

(3)  The  management  fee  paid to  Pioneering  Management  Corporation  ("PMC")
consists  of a  basic  fee of  0.625  of  daily  net  assets  and a  performance
adjustment.  The  actual  rate paid to PMC may be higher or lower than the basic
fee.  See  "Management  of the Fund" for  additional  information  about the fee
calculation.
</FN>
</TABLE>

EXAMPLE:

You would pay the following fees and expenses on a $1,000 investment, assuming a
5% annual return and redemption at the end of each time period:
<TABLE>
<CAPTION>

                                            1 YEAR            3 YEARS           5 YEARS          10 YEARS
                                            ------            -------           -------          --------

<S>                                         <C>                <C>               <C>              <C>  
CLASS A SHARES
   Management Fee
     Basic                                  $ 10               $ 30              $ 52             $ 116
     Maximum                                $ 11               $ 35              $ 61             $ 135
     Minimum                                $  8               $ 24              $ 42             $  94


                                      -4-
<PAGE>

CLASS B SHARES*
- --Assuming complete
  redemption at end
  of period
   Management Fee
    Basic                                   $ 59               $ 88             $ 119             $ 215
    Maximum                                 $ 61               $ 94             $ 130             $ 237
    Minimum                                 $ 57               $ 82             $ 109             $ 193
- --Assuming no
  redemption
   Management Fee
    Basic                                   $ 19               $ 58             $  99             $ 215
    Maximum                                 $ 21               $ 64             $ 110             $ 237
    Minimum                                 $ 17               $ 52             $  89             $ 193
CLASS C SHARES
- --Assuming complete
  redemption at end
  of period
   Management Fee
    Basic                                   $ 29               $ 58             $  99            $ 215
    Maximum                                 $ 31               $ 64             $ 110            $ 237
    Minimum                                 $ 27               $ 52             $  89            $ 193
- --Assuming no
  redemption
   Management Fee
    Basic                                   $ 19               $ 58             $  99            $ 215
    Maximum                                 $ 21               $ 64             $ 110            $ 237
    Minimum                                 $ 17               $ 52             $  89            $ 193
<FN>

* Class B shares convert to Class A shares eight years after purchase.
</FN>
</TABLE>

The example above assumes the  reinvestment  of all dividends and  distributions
and that the percentage amounts listed under "Annual Operating  Expenses" remain
the same each year.

THE  EXAMPLE  IS  DESIGNED  FOR  INFORMATION  PURPOSES  ONLY,  AND SHOULD NOT BE
CONSIDERED A REPRESENTATION  OF FUTURE EXPENSES OR RETURN.  ACTUAL FUND EXPENSES
AND  RETURN  WILL VARY FROM YEAR TO YEAR AND MAY BE HIGHER OR LOWER  THAN  THOSE
SHOWN.

For further information regarding management fees, 12b-1 fees and other expenses
of the Fund,  including  information  regarding the basis upon which  management
fees and 12b-1 fees are paid, see "Management of the Fund," "Distribution Plans"
and "How To Buy Fund Shares" in this Prospectus and "Management of the Fund" and
"Underwriting  Agreement and Distribution  Plans" in the Statement of Additional
Information.  The Fund's  imposition of a Rule 12b-1 fee may result in long-term
shareholders  paying more than the  economic  equivalent  of the  maximum  sales


                                      -5-
<PAGE>

charge  permitted  under Rules of Fair Practice of the National  Association  of
Securities Dealers, Inc.
("NASD").

The maximum  initial  sales charge is reduced on  purchases of specified  larger
amounts of Class A shares and the value of shares owned in other Pioneer  mutual
funds is taken into account in determining the applicable  initial sales charge.
See "How to Buy Fund  Shares." No sales charge is applied to exchanges of shares
of the Fund for shares of other publicly  available  Pioneer  mutual funds.  See
"How to Exchange Shares."

II.  FINANCIAL HIGHLIGHTS

     The following  information has been derived from 1995 appears in the Fund's
Annual  Report which is financial  statements  which have been audited by Arthur
incorporated by reference in the Statement of Andersen LLP,  independent  public
accounts, in Additional Information.  The Annual Report includes connection with
their examination of the Fund's more information about the Fund's (CLASS A ONLY)
financial  statements.  Arthur  Andersen  LLP's  report  on  performance  and is
available  free of charge by  calling  the  Fund's  financial  statements  as of
September 30, Shareholder Services at 1-800-225-6292.
<TABLE>
<CAPTION>


                                  For the Year Ended September 30,
                            1995     1994      1993       1992      1991      1990      1989     1988      1987       1986

<S>                      <C>       <C>       <C>        <C>       <C>       <C>       <C>      <C>       <C>        <C>    
Net asset value,
  beginning of period    $  19.92  $ 21.12   $ 18.03    $ 16.16   $ 12.96   $ 17.80   $ 15.09  $ 18.52   $ 16.01    $ 13.98
Income from investment
  operations--
 Net investment income   $   0.24  $  0.24   $  0.28    $  0.33   $  0.41   $  0.41   $  0.42  $  0.30   $  0.28    $  0.34
 Net realized and
  unrealized gain (loss)
  on  investments            2.70     0.32      3.72       2.04      3.94     (3.56)     3.33    (1.91)     3.76       2.41
  Total income (loss)
  from investment
    operations             $ 2.94   $ 0.56    $ 4.00     $ 2.37    $ 4.35    $(3.15)   $ 3.75   $(1.61)  $  4.04     $ 2.75
Distribution to
  shareholders from--
 Net investment income      (0.23)   (0.25)    (0.29)     (0.35)    (0.41)    (0.46)    (0.36)   (0.41)    (0.36)     (0.36)
 Net realized capital
  gains                      1.15    (1.51)    (0.62)     (0.15)    (0.74)    (1.23)    (0.68)   (1.41)    (1.17)     (0.36)
Net increase (decrease)
  in net asset value       $ 1.56  $ (1.20)   $ 3.09     $ 1.87    $ 3.20   $ (4.84)   $ 2.71  $ (3.43)   $ 2.51     $ 2.03
Net asset value, end of
  period                  $ 21.48  $ 19.92   $ 21.12    $ 18.03   $ 16.16   $ 12.96   $ 17.80  $ 15.09    $18.52    $ 16.01
  Total return*             16.24     2.62%    22.82%     15.05%    35.80%   (19.39%)   26.32%   (6.00%)   27.50%     20.40%


                                      -6-
<PAGE>

Ratio of net operating
  expenses to average net
  assets                     0.85**   0.86%     0.84%      0.85%     0.74%     0.71%     0.72%    0.76%     0.68%      0.71%
Ratio of net investment
  income to average net
  assets                     1.18**   1.19%     1.43%      1.85%     2.72%     2.58%     2.56%    2.15%     1.74%      2.41%
Portfolio turnover rate        19%      15%       18%        12%        5%       14%       16%      12%       23%        24%
Net assets end of period
  (in thousands)         $1,082,154 $1,017,233 $1,019,059 $779,631 $692,344  $562,343  $752,135 $616,953   $734,300  $543,173  
<FN>

*    Assumes  initial  investment  at net asset value at the  beginning  of each
     year,  reinvestment of all  distributions,  the complete  redemption of the
     investment at net asset value at the end of each year and no sales charges.
     Total return would be reduced if sales charges were taken into account.
**   Ratios include  expenses paid through certain expense offset  arrangements.
     Exclusion of such offset arrangements had no impact on these ratios.
</FN>
</TABLE>

III. INVESTMENT OBJECTIVE AND POLICIES

The investment objective of the Fund is to seek capital growth by investing in a
diversified portfolio of securities consisting primarily of common stocks.

The Fund is  managed  in  accordance  with the  value  philosophy  of PMC.  This
approach consists of developing a diversified portfolio of securities consistent
with the Fund's  investment  objective  and  selected  primarily on the basis of
PMC's judgment that the securities have an underlying value, or potential value,
which exceeds  their  current  prices.  The analysis and  quantification  of the
economic  worth,  or  basic  value,  of  individual   companies  reflects  PMC's
assessment of a company's assets and the company's prospects for earnings growth
over the next 11/2-to-3 years. PMC relies primarily on the knowledge, experience
and judgment of its own research staff,  but also receives and uses  information
from a variety of outside sources,  including  brokerage firms,  electronic data
bases, specialized research firms and technical journals.

Under normal circumstances, at least 65% of the Fund's total assets are invested
in  common  stocks of  companies  with a market  capitalization  of less than $5
billion determined at the time the security is purchased. The Fund's investments
in common stock  include  common stock  equivalents,  that is,  securities  with
common stock  characteristics  such as convertible  bonds and preferred  stocks.
While  mid-cap  company  securities  may  offer a greater  capital  appreciation
potential  than  investments  in  large-cap  company  securities,  they may also
present greater risks.  Mid-cap company  securities tend to be more sensitive to
changes in earnings  expectations  and have lower trading volumes than large-cap
company securities and, as a result, they may experience more abrupt and erratic
price movements.

A convertible  security is a long-term debt obligation of the issuer convertible
at a  stated  exchange  rate  into  common  stock  of  the  issuer.  Convertible
securities rank senior to common stocks in an issuer's capital structure and are
consequently  of higher  quality and entail less risk than the  issuer's  common


                                      -7-
<PAGE>

stock. As with all debt securities,  the market values of convertible securities
tend to increase when interest  rates decline and,  conversely,  tend to decline
when  interest  rates  increase.  The Fund may invest in  investment  grade debt
securities,  that is,  securities  rated  "BBB" or higher by  Standard  & Poor's
Ratings Group or the equivalent rating of other ranking agencies.  If the rating
of a security falls below investment  grade,  management will consider  whatever
action is  appropriate  consistent  with the Fund's  investment  objectives  and
policies. See the Statement of Additional Information for a discussion of rating
categories.

While there is no requirement to do so, the Fund intends to limit investments in
foreign securities to no more than 10% of its assets and to limit investments in
readily  tradable  securities of real estate  investment  trusts ("REITS") to no
more than 5% of  assets.  REITs are  pooled  investment  vehicles  which  invest
primarily  in income  producing  real  estate or real  estate  related  loans or
interests.  Investing in REITs involves risks similar to those  associated  with
investing in mid-cap companies. Any current income produced by a security is not
a significant  factor in the selection of investments.  The Fund's portfolio may
include a number of  securities  which are owned by other  equity  mutual  funds
managed by PMC. See "Investment  Policies and  Restrictions" in the Statement of
Additional Information for more information.

The Fund's  fundamental  investment  objective  and the  fundamental  investment
restrictions  set forth in the  Statement of Additional  Information  may not be
changed  without  shareowner   approval.   Certain  other  investment  policies,
strategies and  restrictions  on investment are noted  throughout the Prospectus
and  are  set  forth  in  the   Statement  of  Additional   Information.   These
non-fundamental investment policies,  strategies and restrictions may be changed
at any time by a vote of the Board of Trustees.

It is the policy of the Fund not to engage in trading  for  short-term  profits.
Nevertheless,  changes in the portfolio will be made promptly when determined to
be advisable by reason of  developments  not foreseen at the time of the initial
investment  decision,  and  usually  without  reference  to the length of time a
security has been held. Accordingly, portfolio turnover rate is not considered a
limiting factor in the execution of investment decisions.

The Fund intends to be  substantially  fully invested at all times.  If suitable
investments  are not immediately  available,  the Fund may hold a portion of its
investments  in cash and  cash-equivalents.  For temporary  defensive  purposes,
however, the Fund may invest up to 100% of its assets in short-term investments.
The Fund will  assume a  defensive  posture  only when  political  and  economic
factors affect common stock markets to such an extent that PMC believes there to
be  extraordinary  risks in being  substantially  invested in common  stocks.  A
short-term  investment is considered to be an investment  with a maturity of one
year or less from the date of issuance. Short-term investments will not normally
represent more than 10% of the Fund's assets.

                                      -8-
<PAGE>

The Fund may enter into  repurchase  agreements,  not to exceed seven days, with
broker-dealers  and any member bank of the Federal Reserve System.  The Board of
Trustees  of the Fund  will  review  and  monitor  the  creditworthiness  of any
institution  which  enters  into a  repurchase  agreement  with the  Fund.  Such
repurchase  agreements will be fully  collateralized with United States ("U.S.")
Treasury and/or agency  obligations with a market value of not less than 100% of
the obligations,  valued daily.  Collateral will be held by the Fund's custodian
in a  segregated,  safekeeping  account for the benefit of the Fund.  Repurchase
agreements  afford  the  Fund an  opportunity  to  earn  income  on  temporarily
available  cash at low risk.  In the event that a  repurchase  agreement  is not
fulfilled,  the Fund  could  suffer a loss to the  extent  that the value of the
collateral falls below the repurchase price.

FOREIGN INVESTMENTS AND ASSOCIATED RISK FACTORS

The Fund may  invest  in  securities  issued by  companies  located  in  foreign
countries.  Investing  in  securities  of  foreign  companies  involves  certain
considerations  and risks which are not typically  associated  with investing in
securities of domestic  companies.  Foreign companies are not subject to uniform
accounting,  auditing and  financial  standards and  requirements  comparable to
those applicable to U.S.  companies.  There may also be less publicly  available
information  about foreign  companies  compared to reports and ratings published
about U.S. companies. In addition, foreign securities markets have substantially
less volume than domestic  markets and securities of some foreign  companies are
less liquid and more volatile than  securities  of  comparable  U.S.  companies.
There  may  also  be less  government  supervision  and  regulation  of  foreign
securities  exchanges,  brokers and listed  companies  than exists in the United
States.  Dividends  or  interest  paid by  foreign  issuers  may be  subject  to
withholding  and other  foreign taxes which will decrease the net return on such
investments  as compared to dividends  or interest  paid to the Fund by domestic
companies. Finally, there may be the possibility of expropriations, confiscatory
taxation,  political,  economic or social instability or diplomatic developments
which could adversely affect assets of the Fund held in foreign countries.

The value of foreign  securities may also be adversely  affected by fluctuations
in the relative rates of exchange  between the  currencies of different  nations
and by  exchange  control  regulations.  For  example,  the  value of a  foreign
security  held by the Fund as  measured  in U.S.  dollars  will  decrease if the
foreign currency in which the security is denominated  declines in value against
the U.S. dollar. In such event, this will cause an overall decline in the Fund's
net asset value and may also reduce net investment  income and capital gains, if
any, to be distributed in U.S. dollars to shareholders of the Fund.

IV. MANAGEMENT OF THE FUND

The Board of Trustees of the Fund has overall  responsibility for management and
supervision of the Fund. There are currently eight Trustees, six of whom are not


                                      -9-
<PAGE>

"interested  persons"  of the Fund as defined in the  Investment  Company Act of
1940, as amended (the "1940 Act"). The Board meets at least quarterly. By virtue
of the functions  performed by PMC as investment  adviser,  the Fund requires no
employees  other  than  its  executive  officers,  all  of  whom  receive  their
compensation from PMC or other sources. The Statement of Additional  Information
contains the names and general  business  and  professional  background  of each
Trustee and executive officer of the Fund.

Investment  advisory  services  are  provided  to the Fund by PMC  pursuant to a
management  contract between PMC and the Fund. PMC serves as investment  adviser
to the Fund and is responsible for the overall management of the Fund's business
affairs,  subject  only to the  authority  of the  Board of  Trustees.  PMC is a
wholly-owned  subsidiary of The Pioneer Group, Inc.  ("PGI"),  a publicly-traded
Delaware  corporation.  Pioneer Funds  Distributor,  Inc.  ("PFD"),  an indirect
subsidiary of PGI, is the principal underwriter of the Fund.

Each domestic equity portfolio managed by PMC,  including this Fund, is overseen
by  an  Equity   Committee,   which   consists  of  PMC's  most  senior   equity
professionals,  and a Portfolio  Management  Committee,  which consists of PMC's
domestic  equity  portfolio  managers.  Both committees are chaired by Mr. David
Tripple,  PMC's  President  and Chief  Investment  Officer  and  Executive  Vice
President  of each of the  Funds.  Mr.  Tripple  Joined  PMC in 1974 and has had
general  responsibility  for PMC's investment  operations and specific portfolio
assignments for over five years. Day-to-day management of the Fund's investments
has been the  responsibility of Robert W. Benson since December 1986. Mr. Benson
is Vice  President  of the Fund and Senior Vice  President  of PMC.  Mr.  Benson
joined PMC in 1974.

In addition to the Fund, PMC also manages and serves as the  investment  adviser
for  other  mutual  funds  and  is  an  investment   adviser  to  certain  other
institutional  accounts.  PMC's and PFD's  executive  offices  are located at 60
State Street, Boston, Massachusetts 02109.

Under the terms of its contract with the Fund,  PMC assists in the management of
the Fund and is authorized in its discretion to buy and sell  securities for the
account of the Fund. PMC pays all the expenses, including executive salaries and
the rental of certain office space,  related to its services for the Fund,  with
the exception of the following which are to be paid by the Fund: (a) charges and
expenses  for Fund  accounting,  pricing  and  appraisal  services  and  related
overhead,  including,  to the extent such services are performed by personnel of
PMC or its affiliates,  office space and facilities and personnel  compensation,
training and benefits; (b) the charges and expenses of auditors; (c) the charges
and expenses of any custodian,  transfer agent, plan agent,  dividend disbursing
agent and  registrar  appointed  by the Fund;  (d)  issue  and  transfer  taxes,
chargeable to the Fund in connection with  securities  transactions to which the
Fund is a party; (e) insurance  premiums,  interest  charges,  dues and fees for
membership in trade  associations,  and all taxes and corporate  fees payable by
the Fund to federal, state or other governmental agencies; (f) fees and expenses
involved in registering  and  maintaining  registrations  of the Fund and/or its


                                      -10-
<PAGE>

shares  with  the  SEC,  individual  states  or blue  sky  securities  agencies,
territories and foreign countries, including the preparation of Prospectuses and
Statements of Additional  Information  for filing with the SEC; (g) all expenses
of  shareholders'  and  Trustees'  meetings  and  of  preparing,   printing  and
distributing  prospectuses,   notices,  proxy  statements  and  all  reports  to
shareholders  and to  governmental  agencies;  (h) charges and expenses of legal
counsel to the Fund and the Trustees;  (i) distribution fees paid by the Fund in
accordance with Rule 12b-1  promulgated by the SEC pursuant to the 1940 Act; (j)
compensation  of  those  Trustees  of the Fund  who are not  affiliated  with or
interested  persons of PMC, the Fund (other than as  Trustees),  PGI or PFD; (k)
the cost of  preparing  and  printing  share  certificates;  and (l) interest on
borrowed money, if any. In addition to the expenses  described  above,  the Fund
shall pay all brokers' and  underwriting  commissions  chargeable to the Fund in
connection with securities transactions to which the Fund is a party.

Orders for the Fund's portfolio securities transactions are placed by PMC, which
strives  to  obtain  the best  price  and  execution  for each  transaction.  In
circumstances  in which two or more  broker-dealers  are in a position  to offer
comparable  prices and  execution,  consideration  may be given to  whether  the
broker-dealer provides investment research or brokerage services or sells shares
of any Pioneer  mutual fund. See the Statement of Additional  Information  for a
further description of PMC's brokerage allocation practices.

MANAGEMENT FEE

As  compensation  for its  management  services and certain  expenses  which PMC
incurs  on  behalf  of the  Fund,  the Fund  pays PMC a  management  fee that is
comprised of two components.  The first component is a basic fee equal to 0.625%
per annum of the Fund's  average daily net assets (the "Basic Fee").  The second
component is a performance fee adjustment.

COMPUTING THE PERFORMANCE FEE ADJUSTMENT.

The Basic Fee is  subject  to an upward or  downward  adjustment,  depending  on
whether,  and to what extent,  the  investment  performance  of the Fund for the
performance  period  exceeds,  or is exceeded by, the record of the Standard and
Poors Mid-Cap 400 Index of mid-capitalization stocks (the "Index") over the same
period.  The  performance  period consists of the current month and the prior 35
months  ("performance  period").  Each  percentage  point of difference (up to a
maximum of +/-10) is multiplied by a performance adjustment rate of 0.02%. This,
the maximum annualized adjustment rate is +/- 0.20%. This performance comparison
is made at the  end of each  month.  One  twelfth  (1/12)  of this  rate is then
applied to the fund's  average  net  assets for the entire  performance  period,
giving a dollar amount that will be added to (or subtracted from) the Basic Fee.

                                      -11-
<PAGE>

The Fund's performance is calculated based on its net asset value per share. For
purposes of calculating  the  performance  adjustment,  any dividends or capital
gains distributions paid by the Fund are treated as if reinvested in Fund shares
at the net asset value per share as of the record date for  payment.  The record
for the  Index  is  based  on  change  in  value  and is  adjusted  for any cash
distributions from the companies whose securities whose securities  comprise the
S&P 400.

Because the adjustment to the Basic Fee is based on the comparative  performance
of the Fund and the record of the Index,  the controlling  factor is not whether
Fund  performance  is up or down, but whether it is up or down more or less than
the record of the Index.  Moreover,  the  comparative  investment of the Fund is
based solely on the relevant performance period without regard to the cumulative
performance over a longer or shorter period of time.

Phase-In Of Performance Fee Arrangements.

The Fund's current  management  contract with PMC became  effective  February 1,
1996. Under the terms of the contract,  for the period beginning  February 1 and
ending June 30, 1996, the Fund would pay PMC fees at the following annual rates,
which are the same as those under the contract  previously  in effect:  0.50% on
average  net  assets up to $250  million,  0.48% on the next $50  million in net
assets and 0.45% on net assets exceeding $300 million.  For the period beginning
July 1 and  ending  December  31,  1996,  the Basic Fee will take  effect  but a
performance  adjustment  will only be made if this will  result in a lowering of
the basic fee. For periods after  January 1, 1997,  the  performance  adjustment
will be made as described above.

The performance period initially used for calculating any performance adjustment
to the Basic  Fee will  begin on  February  1,  1996 and will  increase  by each
succeeding  month until a total of 36 months has been reached.  Thereafter,  the
performance  period will consist of the current month and the prior 35 months as
described above.

The basic fee is computed  daily,  the  performance fee adjustment is calculated
once per month and the entire management fee is normally paid monthly.

John F.  Cogan,  Jr.,  Chairman  and  President  of the Fund,  Chairman  of PFD,
President  and a  Director  of PGI and  Chairman  and a Director  of PMC,  owned
approximately 15% of the outstanding capital stock of PGI as of the date of this
Prospectus.

V. FUND SHARE ALTERNATIVES

   The Fund  continuously  offers three Classes of shares designated as Class A,
Class B and Class C shares, as described more fully in "How to Buy Fund Shares."
If you do not specify in your instructions to the Fund which Class of shares you
wish  to  purchase,   exchange  or  redeem,  the  Fund  will  assume  that  your
instructions apply to Class A shares.

                                      -12-
<PAGE>

   CLASS A SHARES.  If you invest  less than $1  million in Class A shares,  you
will pay an initial  sales  charge.  Certain  purchases  may qualify for reduced
initial sales  charges.  If you invest $1 million or more in Class A shares,  no
sales charge will be imposed at the time of purchase,  however,  shares redeemed
within 12 months of  purchase  may be subject  to a  contingent  deferred  sales
charge ("CDSC").  Class A shares are subject to distribution and service fees at
a combined  annual  rate of up to 0.25% of the Fund's  average  daily net assets
attributable to Class A shares.

   CLASS B  SHARES.  If you plan to invest up to  $250,000,  Class B shares  are
available to you.  Class B shares are sold without an initial sales charge,  but
are subject to a CDSC of up to 4% if redeemed  within six years.  Class B shares
are subject to distribution  and service fees at a combined annual rate of 1.00%
of the Fund's  average  daily net assets  attributable  to Class B shares.  Your
entire  investment  in Class B shares is available to work for you from the time
you make your investment, but the higher distribution fee paid by Class B shares
will cause your Class B shares (until conversion) to have a higher expense ratio
and to pay lower  dividends,  to the  extent  dividends  are paid,  than Class A
shares.  Class B shares will automatically  convert to Class A shares,  based on
relative net asset value, eight years after the initial purchase.

   CLASS C SHARES.  Class C shares are sold without an initial sales charge, but
are  subject  to a 1% CDSC if they are  redeemed  within  the first  year  after
purchase.  Class C shares are  subject to  distribution  and  service  fees at a
combined  annual  rate of up to 1.00% of the  Fund's  average  daily net  assets
attributable  to Class C shares.  Your  entire  investment  in Class C shares is
available to work for you from the time you make your investment, but the higher
distribution fee paid by Class C shares will cause your Class C shares to have a
higher  expense ratio and to pay lower  dividends,  to the extent  dividends are
paid, than Class A shares. Class C shares have no conversion feature.

   SELECTING  A CLASS OF SHARES.  The  decision  as to which  Class to  purchase
depends on the amount you invest, the intended length of the investment and your
personal  situation.  If you are making an investment that qualifies for reduced
sales charges,  you might  consider Class A shares.  If you prefer not to pay an
initial  sales charge on an  investment of $250,000 or less and you plan to hold
the investment for at least six years, you might consider Class B shares. If you
prefer not to pay an initial  sales charge and you plan to hold your  investment
for one to eight years, you may prefer Class C shares.

   Investment   dealers  or  their   representatives   may   receive   different
compensation  depending  on which  Class of  shares  they  sell.  Shares  may be
exchanged  only for shares of the same Class of another  Pioneer mutual fund and
shares  acquired  in the  exchange  will  continue  to be  subject  to any  CDSC
applicable to the shares of the Fund originally  purchased.  Shares sold outside
the U.S. to persons who are not U.S.  citizens may be subject to different sales
charges,  CDSC's and dealer  compensation  arrangements in accordance with local
laws and business practices.

                                      -13-
<PAGE>

VI. SHARE PRICE

Shares of the Fund are sold at the public offering price, which is the net asset
value per share plus the applicable sales charge. Net asset value per share of a
Class of the Fund is  determined  by  dividing  the  value of its  assets,  less
liabilities  attributable  to that Class,  by the number of shares of that Class
outstanding.  The net  asset  value  is  computed  once  daily,  on each day the
Exchange is open, as of the close of regular trading on the Exchange.

Securities are valued at the last sale price on the principal exchange or market
where they are traded. Securities which have not traded on the date of valuation
or securities  for which sales prices are not  generally  reported are valued at
the mean between the current bid and asked prices.  Securities quoted in foreign
currencies  are  converted to U.S.  dollars  utilizing  foreign  exchange  rates
employed  by the Fund's  independent  pricing  services.  Generally,  trading in
foreign securities is substantially completed each day at various times prior to
the close of the Exchange.  The values of such  securities used in computing the
net asset value of the Fund's shares are  determined  as of such times.  Foreign
currency exchange rates are also generally  determined prior to the close of the
Exchange.  Occasionally,  events which affect the values of such  securities and
such exchange rates may occur between the times at which they are determined and
the close of the Exchange and will therefore not be reflected in the computation
of the Fund's net asset value. If events materially  affecting the value of such
securities  occur during such period,  then these securities are valued at their
fair value as determined  in good faith by the Trustees.  All assets of the Fund
for which there is no other  readily  available  valuation  method are valued at
their fair value as determined in good faith by the Trustees.

VII. HOW TO BUY FUND SHARES

   YOU MAY BUY FUND  SHARES AT THE PUBLIC  OFFERING  PRICE  FROM ANY  SECURITIES
BROKER-DEALER HAVING A SALES AGREEMENT WITH PFD. IF YOU DO NOT HAVE A SECURITIES
BROKER-DEALER, PLEASE CALL 1-800-225-6292 FOR ASSISTANCE.

  The minimum initial  investment is $1,000 for Class A, B and C shares,  except
as specified below.  The minimum initial  investment is $50 for Class A accounts
being established to utilize monthly bank drafts, government allotments, payroll
deduction  and  other  similar  automatic  investment  plans.  Separate  minimum
investment  requirements  apply to  retirement  plans and to telephone  and wire
orders  placed by  broker-dealers;  and no sales  charge or  minimum  investment
requirements   apply  to  the   reinvestment   of  dividends  or  capital  gains
distributions.  The minimum subsequent  investment is $50 for Class A shares and
$500 for Class B and C shares  except  that the  subsequent  minimum  investment
amount for Class B and C share  accounts may be as little as $50 if an automatic
investment plan (see "Automatic Investment Plans") is established.

                                      -14-
<PAGE>

   TELEPHONE  PURCHASES.  Your account is  automatically  authorized to have the
telephone  purchase  privilege  unless you  indicated  otherwise on your Account
Application  or by writing  to  Pioneering  Services  Corporation  ("PSC").  The
telephone  purchase  option  may be used to  purchase  additional  shares for an
existing  fund  account;  it may not be used to establish a new account.  Proper
account  identification will be required for each telephone purchase.  A maximum
of $25,000 per account may be  purchased by  telephone  each day. The  telephone
purchase  privilege  is  available  to IRA  accounts but may not be available to
other types of retirement plan accounts. Call PSC for more information.

   YOU ARE STRONGLY URGED TO CONSULT WITH YOUR FINANCIAL REPRESENTATIVE PRIOR TO
REQUESTING  A TELEPHONE  PURCHASE.  To purchase  shares by  telephone,  you must
establish your bank account of record by completing the  appropriate  section of
your Account  Application or an Account  Options Form.  PSC will  electronically
debit  the  amount  of each  purchase  from  this  predesignated  bank  account.
Telephone  purchases may not be made for 30 days after the establishment of your
bank of record or any change to your bank information.

   Telephone purchases will be priced at the net asset value plus any applicable
sales charge next  determined  after PSC's  acceptance  of a telephone  purchase
instruction  and receipt of good funds  (usually  three days after the  purchase
instruction).  You may always  elect to deliver  purchases  to PSC by mail.  See
"Telephone Transactions and Related Liabilities" for additional information.


CLASS A SHARES

   You may buy Class A shares at the  public  offering  price,  that is, the net
asset value per share next computed  after receipt of a purchase  order,  plus a
sales charge as follows:

                             SALES CHARGE AS A % OF
                                                                   DEALER
                                        NET                       ALLOWANCE
                                      OFFERING      AMOUNT        AS A % OF
       AMOUNT OF PURCHASE              PRICE       INVESTED         PRICE
Less than $50,000                       5.75%        6.10%          5.00%
$50,000 but less than $100,000          4.50         4.71           4.00
$100,000 but less than $250,000         3.50         3.63           3.00
$250,000 but less than $500,000         2.50         2.56           2.00
$500,000 but less than $1,000,000       2.00         2.04           1.75
$1 million or more                       -0-          -0-         See Below

No sales charge is payable at the time of purchase on  investments of $1 million
or more, or for investments by certain group plans ("Group Plans"), but for such


                                      -15-
<PAGE>

investments a contingent  deferred sales charge  ("CDSC") of 1.00% is imposed in
the event of a redemption  of Class A shares  within 12 months of purchase.  See
"Redemptions  and  Repurchases"  below.  PFD  may,  in  its  discretion,  pay  a
commission to broker-dealers who initiate and are responsible for such purchases
as  follows:  1.00% on the  first  $5  million  invested;  0.50% on the next $45
million  invested;  and 0.25% on the excess  over $50  million  invested.  These
commissions  shall  not be  payable  if the  purchaser  is  affiliated  with the
broker-dealer  or if the purchase  represents the  reinvestment  of a redemption
made  during the  previous  12  calendar  months.  Broker-dealers  who receive a
commission  in  connection  with Class A share  purchases  at net asset value by
401(a) or 401(k)  retirement  plans with 1,000 or more eligible  participants or
with at least  $10  million  in plan  assets  will be  required  to  return  any
commissions  paid or a pro rata portion  thereof if the retirement  plan redeems
its shares within 12 months of purchase.  See also "How to Sell Fund Shares." In
connection with PGI's acquisition of Mutual of Omaha Fund Management Company and
contingent upon the achievement of certain sales objectives, PFD may pay pays to
Mutual of Omaha  Investor  Services,  Inc.  50% of PFD's  retention of any sales
commission on sales of the Fund's shares through such dealer.

   The schedule of sales  charges  above is  applicable  to purchases of Class A
shares  of the  Fund by (i) an  individual,  (ii) an  individual  and his or her
spouse and children  under the age of 21 and (iii) a trustee or other  fiduciary
of a trust estate or fiduciary  account or related trusts or accounts  including
pension,  profit-sharing  and other  employee  benefit  trusts  qualified  under
Section  401 or 408 of the  Internal  Revenue  Code of  1986,  as  amended  (the
"Code"),  although  more than one  beneficiary  is involved.  The sales  charges
applicable  to a  current  purchase  of Class A  shares  of the Fund by a person
listed above is  determined by adding the value of shares to be purchased to the
aggregate  value (at the then  current  offering  price) of shares of any of the
other Pioneer mutual funds previously purchased and then owned , provided PFD is
notified by such person or his or her broker-dealer each time a purchase is made
which would qualify. Pioneer mutual funds include all mutual funds for which PFD
serves as principal  underwriter.  See the "Letter of Intention"  section of the
Account Application.

   QUALIFYING FOR A REDUCED SALES CHARGE. Class A shares of the Fund may be sold
at a reduced or eliminated  sales charge to certain group plans ("Group  Plans")
under which a sponsoring  organization makes  recommendations  to, permits group
solicitation of, or otherwise facilitates  purchases by, its employees,  members
or  participants.  Class A shares of the Fund may be sold at net asset value per
share  without a sales charge to  state-sponsored  Optional  Retirement  Program
participants  if (i) the employer has  authorized a limited number of investment
company  providers  for the  Program,  (ii) all  authorized  investment  company
providers offer their shares to Program  participants at net asset value,  (iii)
the employer has agreed in writing to actively promote the authorized investment
providers to Program  participants  and (iv) the Program provides for a matching
contribution  for  each  participant   contribution.   Information   about  such
arrangements is available from PFD.

                                      -16-
<PAGE>

   Class A shares  of the Fund may also be sold at net  asset  value  per  share
without a sales  charge to: (a) current or former  Trustees  and officers of the
Fund and partners  and  employees  of its legal  counsel;  (b) current or former
directors,   officers,   employees   or  sales   representatives   of  PGI,  its
subsidiaries;  (c) current or former  directors,  officers,  employees  or sales
representatives  of any  subadviser  or  predecessor  investment  adviser to any
investment  company  for which  PMC  serves as an  investment  adviser,  and the
subsidiaries  or  affiliates of such  persons;  (d) current or former  officers,
partners,  employees or registered  representatives of broker-dealers which have
entered into sales agreements with PFD; (e) members of the immediate families of
any of the persons above; (f) any trust, custodian,  pension,  profit-sharing or
other benefit plan of the foregoing  persons;  (g)  insurance  company  separate
accounts;  (h) certain  "wrap  accounts" for the benefit of clients of financial
planners adhering to standards  established by PFD; (i) other funds and accounts
for which PMC or any of its affiliates serves as investment  adviser or manager;
and (j) certain unit  investment  trusts.  Shares so purchased are purchased for
investment  purposes  and  may  not  be  resold  except  through  redemption  or
repurchase by or on behalf of the Fund.  The  availability  of this privilege is
conditioned on the receipt by PFD of written notification of eligibility.  Class
A shares of the Fund may also be sold at net asset value  without a sales charge
in  connection   with  certain   reorganization,   liquidation   or  acquisition
transactions involving other investment companies or personal holding companies.

   Reduced sales  charges for Class A shares are available  through an agreement
to purchase a specified quantity of Fund shares over a designated thirteen-month
period  by  completing  the  "Letter  of  Intention"   section  of  the  Account
Application.  Information about the "Letter of Intention"  procedure,  including
its terms, is contained on the back of the Account Application as well as in the
Statement  of   Additional   Information.   Investors   who  are  clients  of  a
broker-dealer  with a current  sales  agreement  with PFD may  purchase  Class A
shares of the Fund at net asset  value,  without a sales  charge,  to the extent
that the purchase price is paid out of proceeds from one or more  redemptions by
the investor of shares of certain other mutual funds. In order for a purchase to
qualify for this privilege, the investor must document to the broker-dealer that
the redemption  occurred  within 60 days  immediately  preceding the purchase of
Class A shares;  that the client paid a sales charge on the original purchase of
the shares  redeemed;  and that the mutual fund whose shares were  redeemed also
offers net asset value purchases to redeeming shareholders of any of the Pioneer
mutual funds. Further details may be obtained from PFD.

CLASS B SHARES

   You may buy Class B shares at net asset value  without the  imposition  of an
initial  sales  charge;  however,  Class B shares  redeemed  within six years of
purchase  will be subject to a CDSC at the rates shown in the table  below.  The
charge will be assessed on the amount equal to the lesser of the current  market
value or the original  purchase cost of the shares being redeemed.  No CDSC will
be imposed on  increases  in account  value  above the initial  purchase  price,
including  shares  derived from the  reinvestment  of dividends or capital gains
distributions.

                                      -17-
<PAGE>

   The amount of the CDSC,  if any,  will vary  depending on the number of years
from the time of purchase  until the time of redemption  of Class B shares.  For
the purpose of  determining  the number of years from the time of any  purchase,
all payments during a quarter will be aggregated and deemed to have been made on
the first day of that quarter. In processing  redemptions of Class B shares, the
Fund will first  redeem  shares not  subject to any CDSC,  and then  shares held
longest  during  the  six-year  period.  As a  result,  you will pay the  lowest
possible CDSC.

YEAR SINCE                        CDSC AS A PERCENTAGE OF DOLLAR
PURCHASE                             AMOUNT SUBJECT TO CDSC
- --------                             ----------------------
First                                        4.0%
Second                                       4.0%
Third                                        3.0%
Fourth                                       3.0%
Fifth                                        2.0%
Sixth                                        1.0%
Seventh and thereafter                       none

   Proceeds  from  the  CDSC are paid to PFD and are used in whole or in part to
defray PFD's expenses related to providing  distribution-related services to the
Fund in  connection  with the sale of Class B shares,  including  the payment of
compensation to broker-dealers.

   Class B shares will  automatically  convert into Class A shares at the end of
the  calendar  quarter that is eight years after the  purchase  date,  except as
noted below.  Class B shares acquired by exchange from Class B shares of another
Pioneer  fund will  convert into Class A shares based on the date of the initial
purchase and the applicable CDSC.  Class B shares acquired through  reinvestment
of  distributions  will  convert  into  Class A shares  based on the date of the
initial purchase to which such shares relate.  For this purpose,  Class B shares
acquired through  reinvestment of distributions will be attributed to particular
purchases of Class B shares in accordance  with such  procedures as the Trustees
may  determine  from time to time.  The  conversion of Class B shares to Class A
shares is subject to the continuing  availability  of a ruling from the Internal
Revenue Service ("IRS") that such conversions will not constitute taxable events
for federal tax  purposes.  The  conversion  of Class B shares to Class A shares
will not occur if such ruling is not available  and,  therefore,  Class B shares
would  continue  to be  subject  to higher  expenses  than Class A shares for an
indeterminate period.

CLASS C SHARES

   You may buy Class C shares at net asset value  without the  imposition  of an
initial  sales  charge;  however,  Class C shares  redeemed  within  one year of
purchase will be subject to a CDSC of 1.00%.  The charge will be assessed on the
amount equal to the lesser of the current market value or the original  purchase


                                      -18-
<PAGE>

cost of the shares  being  redeemed.  No CDSC will be imposed  on  increases  in
account value above the initial  purchase price,  including  shares derived from
the reinvestment of dividends or capital gains distributions.  Class C shares do
not convert to any other Class of Fund shares.

   For the purpose of determining the time of any purchase,  all payments during
a quarter  will be  aggregated  and deemed to have been made on the first day of
that quarter.  In processing  redemptions of Class C shares, the Fund will first
redeem  shares not subject to any CDSC,  and then  shares held for the  shortest
period of time during the one-year period. As a result,  you will pay the lowest
possible CDSC.

   Proceeds  from  the  CDSC are paid to PFD and are used in whole or in part to
defray PFD's expenses related to providing  distribution-related services to the
Fund in  connection  with the sale of Class C shares,  including  the payment of
compensation to broker-dealers.

WAIVER OR REDUCTION OF CONTINGENT  DEFERRED  SALES  CHARGE.  The CDSC on Class B
shares and on any Class A shares  subject to a CDSC may be waived or reduced for
non-retirement  accounts  if: (a) the  redemption  results from the death of all
registered owners of an account (in the case of UGMAs, UTMAs and trust accounts,
waiver applies upon the death of all beneficial owners) or a total and permanent
disability  (as  defined  in Section  72 of the Code) of all  registered  owners
occurring  after the purchase of the shares being redeemed or (b) the redemption
is made in  connection  with  limited  automatic  redemptions  as set  forth  in
"Systematic  Withdrawal  Plans"  (limited in any year to 10% of the value of the
account in the Fund at the time the withdrawal plan is established).

   The CDSC on Class B shares and on any Class A shares subject to a CDSC may be
waived or reduced for retirement  plan accounts if: (a) the  redemption  results
from the death or a total and permanent  disability (as defined in Section 72 of
the Code)  occurring  after the  purchase  of the  shares  being  redeemed  of a
shareowner or  participant  in an  employer-sponsored  retirement  plan; (b) the
distribution is to a participant in an Individual  Retirement  Account  ("IRA"),
403(b)  or   employer-sponsored   retirement  plan,  is  part  of  a  series  of
substantially equal payments made over the life expectancy of the participant or
the joint life  expectancy of the  participant  and his or her beneficiary or as
scheduled periodic payments to a participant  (limited in any year to 10% of the
value  of the  participant's  account  at the time the  distribution  amount  is
established; a required minimum distribution due to the participant's attainment
of age 70-1/2 may exceed the 10% limit only if the distribution  amount is based
on plan assets held by Pioneer); (c) the distribution is from a 401(a) or 401(k)
retirement  plan  and is a return  of  excess  employee  deferrals  or  employee
contributions  or a qualifying  hardship  distribution as defined by the Code or
results from a termination of employment  (limited with respect to a termination
to 10% per year of the value of the plan's assets in the Fund as of the later of
the prior December 31 or the date the account was established  unless the plan's
assets are being rolled over to or  reinvested  in the same class of shares of a
Pioneer mutual fund subject to the CDSC of the shares  originally held); (d) the
distribution is from an IRA, 403(b) or employer-sponsored retirement plan and is
to be  rolled  over to or  reinvested  in the same  class of shares in a Pioneer


                                      -19-
<PAGE>

mutual fund and which will be subject to the  applicable  CDSC upon  redemption;
(e) the  distribution  is in the form of a loan to a participant in a plan which
permits loans (each  repayment of the loan will constitute a new sale which will
be subject to the applicable CDSC upon  redemption);  or (f) the distribution is
from a  qualified  defined  contribution  plan and  represents  a  participant's
directed transfer (provided that this privilege has been pre-authorized  through
a prior agreement with PFD regarding participant directed transfers).

   The CDSC on Class C shares may be waived or reduced for either non-retirement
or retirement  plan accounts if: (a) the redemption  results from the death or a
total and permanent  disability (as defined in Section 72 of the Code) occurring
after the purchase of the shares being  redeemed of a shareowner or  participant
in an  employer-sponsored  retirement  plan.  The CDSC on Class C shares  may be
waived or reduced  for  retirement  plan  accounts if the  distribution  is to a
participant in an Individual  Retirement  Account ("IRA") or  employer-sponsored
retirement plan and is (a) part of a series of substantially equal payments made
over the life  expectancy of the participant or the joint life expectancy of the
participant and his or her  beneficiary;  (b) in the form of scheduled  periodic
payments to a  participant;  (c) a return of excess  employee  deferrals;  (d) a
qualifying hardship  distribution as defined by the Code; (e) from a termination
of employment; (f) the distribution is in the form of a loan to a participant in
a plan which permits loans; or (g) from a qualified  defined  contribution  plan
and represents a participant's  directed transfer  (provided that this privilege
has been pre-authorized through a prior agreement with PFD regarding participant
directed transfers).

   The CDSC on Class B and Class C shares and on any Class A shares subject to a
CDSC may be waived or  reduced  for either  non-retirement  or  retirement  plan
accounts if: (a) the  redemption is made by any state,  county,  or city, or any
instrumentality,  department,  authority, or agency thereof, which is prohibited
by applicable  laws from paying a CDSC in  connection  with the  acquisition  of
shares of any registered investment management company; or (b) the redemption is
made pursuant to the Fund's right to liquidate or involuntarily redeem shares in
a shareowner's account.

   BROKER-DEALERS.  An order for any Class of Fund shares received by PFD from a
broker-dealer prior to the close of regular trading on the Exchange is confirmed
at the price  appropriate  for that Class as  determined at the close of regular
trading on the Exchange on the day the order is received,  provided the order is
received prior to PFD's close of business (usually,  5:30 p.m. Eastern Time). It
is the  responsibility of broker-dealers to transmit orders so that they will be
received by PFD prior to its close of business.

                                      -20-
<PAGE>

   GENERAL.  The Fund reserves the right in its sole  discretion to withdraw all
or any part of the  offering  of shares  when,  in the  judgment  of the  Fund's
management,  such  withdrawal  is in the best  interest of the Fund. An order to
purchase shares is not binding on, and may be rejected by, PFD until it has been
confirmed in writing by PFD and payment has been received.

VIII. HOW TO SELL FUND SHARES

You can arrange to sell  (redeem) Fund shares on any day the Exchange is open by
selling either some or all of your shares to the Fund.

You may sell your shares either  through your  broker-dealer  or directly to the
Fund. Please note the following:

o    If you are selling  shares from a  retirement  account,  you must make your
     request in writing  (except for  exchanges  to other  Pioneer  mutual funds
     which can be  requested by phone or in writing).  Call  1-800-622-0176  for
     more information.

o    If you are selling shares from a non-retirement account, you may use any of
     the methods described below.

Your shares will be sold at the share price next calculated  after your order is
received and accepted less any applicable CDSC. Sale proceeds  generally will be
sent to you in cash,  normally  within  seven days after your order is accepted.
The Fund  reserves  the right to  withhold  payment of the sale  proceeds  until
checks  received by the Fund in payment for the shares being sold have  cleared,
which may take up to 15 calendar days from the purchase date.

IN WRITING. You may sell your shares by delivering a written request,  signed by
all registered  owners,  in good order to PSC,  however,  you must use a written
request,  including  a  signature  guarantee,  to sell your shares if any of the
following situations applies:

o    you wish to sell over $50,000 worth of shares,
o    your account registration or address has changed within the last 30 days
o    the check is not being  mailed to the address on your  account  (address of
     record),
o    the check is not being made out to the account owners, or the
o    sale proceeds are being  transferred to a Pioneer  account with a different
     registration.

Your  request  should  include  your name,  the Fund's  name,  your Fund account
number,  the Class of  shares to be  redeemed,  the  dollar  amount or number of
shares to be redeemed, and any other applicable requirements as described below.
Unless instructed  otherwise,  Pioneer will send the proceeds of the sale to the
address of record. Fiduciaries or corporations are required to submit additional
documents. For more information, contact PSC at 1-800-225-6292.

                                      -21-
<PAGE>

Written requests will not be processed until they are received in good order and
accepted  by PSC.  Good  order  means that  there are no  outstanding  claims or
requests to hold  redemptions on the account,  certificates  are endorsed by the
record  owner(s)  exactly as the shares are  registered  and, if  required,  the
signature(s)  are  guaranteed  by an eligible  guarantor.  You should be able to
obtain a signature  guarantee  from a bank,  broker,  dealer,  credit  union (if
authorized under state law), securities exchange or association, clearing agency
or savings  association.  A notary public cannot provide a signature  guarantee.
Signature  guarantees  are not accepted by  facsimile  ("fax").  For  additional
information  about the necessary  documentation  for redemption by mail,  please
contact PSC at 1-800-225-6292.

BY TELEPHONE OR BY FAX.  Your account is  automatically  authorized  to have the
telephone  redemption  privilege unless you indicated  otherwise on your Account
Application or by writing to PSC. Proper account identification will be required
for each telephone redemption.  The telephone redemption option is not available
to retirement  plan accounts.  A maximum of $50,000 may be redeemed by telephone
or fax and the proceeds  may be received by check or by bank wire or  electronic
funds transfer. To receive the proceeds by check: the check must be made payable
exactly as the account is  registered  and the check must be sent to the address
of record  which  must not have  changed  in the last 30 days.  To  receive  the
proceeds by bank wire or by electronic funds transfer: the proceeds must be sent
to the bank  address  of record  which  must have been  properly  pre-designated
either on your Account  Application or on an Account Options Form and which must
not have  changed in the last 30 days.  To redeem by fax,  send your  redemption
request  to   1-800-225-4240.   You  may  always  elect  to  deliver  redemption
instructions   to  PSC  by  mail.  See  "Telephone   Transactions   and  Related
Liabilities"  below.  Telephone and fax redemptions  will be priced as described
above.  YOU ARE  STRONGLY  URGED TO CONSULT WITH YOUR  FINANCIAL  REPRESENTATIVE
PRIOR TO REQUESTING A TELEPHONE REDEMPTION.

SELLING SHARES THROUGH YOUR BROKER-DEALER. The Fund has authorized PFD to act as
its agent in the repurchase of shares of the Fund from qualified  broker-dealers
and  reserves  the  right  to  terminate  this  procedure  at  any  time.   Your
broker-dealer  must  receive  your  request  before the close of business on the
Exchange  and  transmit it to PFD before PFD's close of business to receive that
day's  redemption  price.  Your  broker-dealer  is responsible for providing all
necessary documentation to PFD and may charge you for its services.

SMALL  ACCOUNTS.  The minimum  account  value is $500. If you hold shares of the
Fund in an  account  with a net asset  value of less than the  minimum  required
amount due to redemptions  or exchanges,  the Fund may redeem the shares held in
this account at net asset value if you have not increased the net asset value of
the account to at least the minimum  required amount within six months of notice
by the Fund to you of the Fund's intention to redeem the shares.

                                      -22-
<PAGE>

CDSC ON CLASS A SHARES. Purchases of Class A shares of $1,000,000 or more, or by
participants  in a Group Plan which were not subject to an initial sales charge,
may be  subject  to a CDSC upon  redemption.  A CDSC is  payable to PFD on these
investments in the event of a share  redemption  within 12 months  following the
share  purchase,  at the rate of 1% of the  lesser  of the  value of the  shares
redeemed  (exclusive of reinvested  dividend and capital gain  distributions) or
the total cost of such shares.  Shares  subject to the CDSC which are  exchanged
into  another  Pioneer  fund will  continue  to be subject to the CDSC until the
original  12-month period expires.  However,  no CDSC is payable with respect to
purchases of Class A shares by 401(a) or 401(k)  retirement  plans with 1,000 or
more eligible participants or with at least $10 million in plan assets.

GENERAL.  Redemptions may be suspended or payment postponed during any period in
which any of the following  conditions  exist: the Exchange is closed or trading
on the Exchange is restricted; an emergency exists as a result of which disposal
by the Fund of securities owned by it is not reasonably practicable or it is not
reasonably  practicable  for the Fund to fairly  determine  the value of the net
assets of its portfolio; or the SEC, by order, so permits.

Redemptions and repurchases are taxable  transactions to  shareholders.  The net
asset value per share received upon redemption or repurchase may be more or less
than the cost of shares to an  investor,  depending  on the market  value of the
portfolio at the time of redemption or repurchase.

IX. HOW TO EXCHANGE FUND SHARES

WRITTEN  EXCHANGES.  You may  exchange  your  shares  by  sending  a  letter  of
instruction  to PSC. Your letter should  include your name, the name of the Fund
out of which you wish to  exchange  and the name of the Fund into which you wish
to exchange,  your fund account  number(s),  the Class of shares to be exchanged
and the  dollar  amount or number of shares to be  exchanged.  Written  exchange
requests  must be  signed by all  record  owner(s)  exactly  as the  shares  are
registered.

TELEPHONE  EXCHANGES.  Your  account  is  automatically  authorized  to have the
telephone  exchange  privilege  unless you  indicated  otherwise on your Account
Application or by writing to PSC. Proper account identification will be required
for each telephone  exchange.  Telephone  exchanges may not exceed  $500,000 per
account per day. Each  voice-requested or FactFoneSM  telephone exchange request
will be  recorded.  You are  strongly  urged  to  consult  with  your  financial
representative  prior  to  requesting  a  telephone  exchange.   See  "Telephone
Transactions and Related Liabilities" below.

AUTOMATIC  EXCHANGES.  You may  automatically  exchange  shares from one Pioneer
account for shares of the same Class in another  Pioneer account on a monthly or
quarterly  basis.  The  accounts  must  have  identical  registrations  and  the


                                      -23-
<PAGE>

originating  account must have a minimum balance of $5,000. The exchange will be
effective on the 18th day of the month.

GENERAL.  Exchanges  must be at least $1,000.  You may exchange your  investment
from one Class of Fund shares at net asset value,  without a sales  charge,  for
shares of the same  Class of any other  Pioneer  mutual  fund.  Not all  Pioneer
mutual funds offer more than one Class of shares.  A new Pioneer  account opened
through an exchange must have a  registration  identical to that on the original
account.

Class A or Class B  shares  which  would  normally  be  subject  to a CDSC  upon
redemption  will not be charged the applicable  CDSC at the time of an exchange.
Shares  acquired  in an  exchange  will be  subject  to the  CDSC of the  shares
originally  held. For purposes of determining the amount of any applicable CDSC,
the length of time you have owned Class B shares  acquired  by exchange  will be
measured from the date you acquired the original shares and will not be affected
by any subsequent exchange.

Exchange  requests  received  by PSC  before  4:00  p.m.  Eastern  Time  will be
effective on that day if the requirements above have been met,  otherwise,  they
will be effective on the next  business  day.  PSC will process  exchanges  only
after receiving an exchange  request in good order.  There are currently no fees
or sales charges  imposed at the time of an exchange.  An exchange of shares may
be made only in states  where  legally  permitted.  For federal and  (generally)
state income tax purposes,  an exchange is considered to be a sale of the shares
of the Fund  exchanged and a purchase of shares in another  Pioneer mutual fund.
Therefore,  an  exchange  could  result  in a gain or loss on the  shares  sold,
depending  on the tax basis of these  shares and the timing of the  transaction,
and special tax rules may apply.

You should  consider the  differences  in objectives and policies of the Pioneer
mutual funds, as described in each fund's current prospectus,  before making any
exchange.  For the protection of the Fund's  performance and  shareholders,  the
Fund and PFD reserve the right to refuse any exchange  request or  restrict,  at
any time without  notice,  the number  and/or  frequency of exchanges to prevent
abuses of the exchange privilege. Such abuses may arise from frequent trading in
response  to  short-term  market  fluctuations,  a  pattern  of  trading  by  an
individual  or group that  appears to be an attempt to "time the market," or any
other exchange request which, in the view of management, will have a detrimental
effect  on the  Fund's  portfolio  management  strategy  or its  operations.  In
addition, the Fund and PFD reserve the right to charge a fee for exchanges or to
modify,  limit,  suspend or  discontinue  the exchange  privilege with notice to
shareholders as required by law.

                                      -24-
<PAGE>

X.  DISTRIBUTION PLANS

   The Fund has  adopted a Plan of  Distribution  for each Class of shares  (the
"Class A Plan,"  "Class B Plan,"  and  "Class C Plan") in  accordance  with Rule
12b-1 under the 1940 Act pursuant to which certain distribution fees are paid to
PFD.

   Pursuant  to the  Class A  Plan,  the  Fund  reimburses  PFD  for its  actual
expenditures to finance any activity primarily intended to result in the sale of
Class A shares or to provide services to holders of Class A shares, provided the
categories  of  expenses  for which  reimbursement  is made are  approved by the
Fund's  Board of  Trustees.  As of the  date of this  Prospectus,  the  Board of
Trustees has approved the following categories of expenses for Class A shares of
the Fund: (i) a service fee to be paid to qualified  broker-dealers in an amount
not to exceed  0.25% per annum of the Fund's  daily net assets  attributable  to
Class A shares; (ii) reimbursement to PFD for its expenditures for broker-dealer
commissions  and employee  compensation  on certain  sales of the Fund's Class A
shares with no initial  sales charge (See "How to Buy Fund  Shares");  and (iii)
reimbursement  to PFD for  expenses  incurred in  providing  services to Class A
shareholders  and supporting  broker-dealers  and other  organizations  (such as
banks and trust companies) in their efforts to provide such services.  Banks are
currently  prohibited  under  the  Glass-Steagall  Act  from  providing  certain
underwriting or distribution  services.  If a bank was prohibited from acting in
any  capacity or  providing  any of the  described  services,  management  would
consider what action, if any, would be appropriate.

   Expenditures  of the Fund  pursuant to the Class A Plan are accrued daily and
may not exceed  0.25% of the Fund's  average  daily net assets  attributable  to
Class A shares.  Distribution  expenses  of PFD are  expected  to  substantially
exceed the distribution  fees paid by the Fund in a given year. The Class A Plan
may not be amended to increase  materially the annual  percentage  limitation of
average net assets which may be spent for the services described therein without
approval of the shareholders of the Fund.

   Both  the  Class B Plan and the  Class C Plan  provide  that  the  Fund  will
compensate PFD by paying a  distribution  fee at the annual rate of 0.75% of the
Fund's average daily net assets  attributable to the applicable  Class of shares
and a service  fee at the annual rate of 0.25% of the Fund's  average  daily net
assets attributable to that Class of shares. The distribution fee is intended to
compensate  PFD for its Class B and Class C  distribution  services to the Fund.
The service fee is intended to be additional  compensation for personal services
and/or account  maintenance  services with respect to Class B or Class C shares.
PFD also receives the proceeds of any CDSC imposed on the  redemption of Class B
or Class C shares.

   Commissions of 4% of the amount invested in Class B shares, equal to 3.75% of
the amount  invested and a first year's service fee equal to 0.25% of the amount
invested,  are paid to broker-dealers  who have selling agreements with PFD. PFD
may advance to dealers  the first year  service fee at a rate up to 0.25% of the
purchase price of such shares and, as compensation therefore, PFD may retain the


                                      -25-
<PAGE>

service  fee paid by the Fund with  respect  to such  shares  for the first year
after  purchase.  Commencing in the 13th month following the purchase of Class B
shares, dealers will become eligible for additional annual service fees of up to
0.25% of the purchase price with respect to such shares.

   Commissions of up to 1% of the amount invested in Class C shares,  consisting
of 0.75% of the amount  invested and a first year's  service fee of 0.25% of the
amount invested,  are paid to  broker-dealers  who have selling  agreements with
PFD. PFD may advance to dealers the first year service fee at a rate up to 0.25%
of the purchase  price of such shares and, as  compensation  therefore,  PFD may
retain the  service  fee paid by the Fund with  respect  to such  shares for the
first year after  purchase.  Commencing in the 13th month following the purchase
of  Class  C  shares,   dealers  will  become  eligible  for  additional  annual
distribution fees and services fees of up to 0.75% and 0.25%,  respectively,  of
the purchase price with respect to such shares.

   Dealers may from time to time be required to meet  certain  criteria in order
to receive  service  fees.  PFD or its  affiliates  are  entitled  to retain all
service fees payable  under the Class B Plan or the Class C Plan for which there
is no dealer of record or for which qualification standards have not been met as
partial  consideration for personal services and/or account maintenance services
performed by PFD or its affiliates for shareowner accounts.

XI. DIVIDENDS, DISTRIBUTIONS AND TAXATION

The Fund has elected to be treated,  has  qualified  and intends to qualify each
year as a "regulated investment company" under Subchapter M of the Code, so that
it will not pay federal income taxes on income and capital gains  distributed to
shareholders  at least  annually.  Under the Code, the Fund will be subject to a
nondeductible 4% federal excise tax on a portion of its undistributed income and
capital gains if it fails to meet certain distribution requirements with respect
to each calendar year. The Fund intends to make distributions in a timely manner
and accordingly does not expect to be subject to the excise tax.

The  Fund's  policy  is to pay to  shareholders  dividends  from net  investment
income,  if any,  twice each year during the months of June and  December and to
make  distributions  from net  long-term  capital  gains,  if any, in  December.
Distributions  from net short-term  capital gains, if any, may be paid with such
dividends;  distributions  from income and/or  capital gains may also be made at
such times as may be necessary to avoid federal income or excise tax.  Dividends
from the Fund's net investment income, net short-term capital gains, and certain
net foreign  exchange gains are taxable as ordinary  income,  and dividends from
the Fund's net long-term capital gains are taxable as long-term capital gains.

Unless shareholders  specify otherwise,  all distributions will be automatically
reinvested in additional  full and  fractional  shares of the Fund.  For federal
income tax  purposes,  all  dividends  are taxable as described  above whether a


                                      -26-
<PAGE>

shareowner  takes them in cash or  reinvests  them in  additional  shares of the
Fund.  Information  as to the federal tax status of dividends and  distributions
will be provided annually.  For further information on the distribution  options
available to shareholders,  see "Distribution  Options" and "Directed Dividends"
below.

Distributions by the Fund of the dividend income it receives from U.S.  domestic
corporations, if any, may qualify for the corporate dividends-received deduction
for corporate shareholders,  subject to minimum holding-period  requirements and
debt-financing restrictions under the Code.

The Fund  anticipates  that it will be subject to foreign  withholding  taxes or
other  foreign taxes on income  (possibly  including  capital  gains) on certain
foreign investments,  which will reduce the yield on those investments. The Fund
does not expect to qualify to pass such taxes and any  associated tax deductions
or credits through to its shareholders.

Dividends and other distributions and the proceeds of redemptions,  exchanges or
repurchases of Fund shares paid to individuals and other non-exempt  payees will
be subject to a 31% backup  withholding of federal income tax if the Fund is not
provided  with the  shareowner's  correct  taxpayer  identification  number  and
certification  that the number is correct and the  shareowner  is not subject to
backup  withholding or if the Fund receives notice from the IRS or a broker that
such withholding applies. Please refer to the Account Application for additional
information.

The description  above relates only to U.S.  federal income tax consequences for
shareholders  who are U.S.  persons,  i.e.,  U.S.  citizens or residents or U.S.
corporations,  partnerships,  trusts  or  estates  and who are  subject  to U.S.
federal  income tax.  Non-U.S.  shareholders  and  tax-exempt  shareholders  are
subject to different tax treatment  that is not  described  above.  Shareholders
should  consult  their  own  tax  advisers  regarding  state,  local  and  other
applicable tax laws.

XII. SHAREOWNER SERVICES

PSC is the shareowner services and transfer agent for shares of the Fund. PSC, a
Massachusetts  corporation,  is a wholly-owned  subsidiary of PGI. PSC's offices
are located at 60 State Street,  Boston,  Massachusetts  02109, and inquiries to
PSC should be mailed to Pioneering Services Corporation,  P.O. Box 9014, Boston,
Massachusetts 02205-9014. Brown Brothers Harriman & Co. (the "Custodian") serves
as custodian of the Fund's portfolio  securities and other assets. The principal
business  address of the  mutual  fund  division  of the  Custodian  is 40 Water
Street, Boston, Massachusetts 02109.

ACCOUNT AND CONFIRMATION STATEMENTS

PSC  maintains  an  account  for each  shareowner  and all  transactions  of the
shareowner are recorded in this account. Confirmation statements showing details
of transactions are sent to shareholders as transactions occur, except Automatic
Investment Plan transactions which are confirmed quarterly. The Combined Account


                                      -27-
<PAGE>

Statement, mailed quarterly, is available to shareholders who have more than one
Pioneer account.

Shareholders whose shares are held in the name of an investment broker-dealer or
other  party will not  normally  have an account  with the Fund and might not be
able to  utilize  some of the  services  available  to  shareholders  of record.
Examples of services  which might not be available are  investment or redemption
of shares  by mail,  automatic  reinvestment  of  dividends  and  capital  gains
distributions,  withdrawal plans, Letters of Intention,  Rights of Accumulation,
telephone exchanges and redemptions, and newsletters.

ADDITIONAL INVESTMENTS

You may add to your  account  by  sending  a check  (minimum  of $50 for Class A
shares  and $500 for Class B and C shares) to PSC  (account  number and Class of
shares  should be  clearly  indicated).  The bottom  portion  of a  confirmation
statement may be used as a remittance slip to make additional investments.

Additions to your  account,  whether by check or through a Pioneer  Investomatic
Plan, are invested in full and  fractional  shares of the Fund at the applicable
offering price in effect as of the close of the Exchange on the day of receipt.

AUTOMATIC INVESTMENT PLANS

You may  arrange  for  regular  automatic  investments  of $50 or  more  through
government/military   allotments,   payroll   deduction  or  through  a  Pioneer
Investomatic  Plan.  A Pioneer  Investomatic  Plan  provides  for a  monthly  or
quarterly  investment  by means of a  pre-authorized  draft  drawn on a checking
account.  Pioneer  Investomatic  Plan  investments  are  voluntary,  and you may
discontinue the Plan at any time without penalty upon 30 days' written notice to
PSC.  PSC  acts  as  agent  for  the  purchaser,  the  broker-dealer  and PFD in
maintaining these plans.

FINANCIAL REPORTS AND TAX INFORMATION

As a shareowner,  you will receive financial reports at least  semiannually.  In
January of each year, the Fund will mail you information about the tax status of
dividends and distributions.

DISTRIBUTION OPTIONS

Dividends  and  capital  gains  distributions,  if any,  will  automatically  be
invested in additional shares of the Fund, at the applicable net asset value per
share, unless you indicate another option on the Account Application.

                                      -28-
<PAGE>

Two  other  options  available  are (a)  dividends  in cash  and  capital  gains
distributions  in  additional  shares;  and (b) all  dividends and capital gains
distributions  in cash.  These  two  options  are not  available,  however,  for
retirement  plans or for an  account  with a net asset  value of less than $500.
Changes in your distribution options may be made by written request to PSC.

DIRECTED DIVIDENDS

You may  elect (in  writing)  to have the  dividends  paid by one  Pioneer  fund
account  invested in a second  Pioneer  fund  account.  The value of this second
account must be at least $1,000 ($500 for Pioneer Fund or Pioneer II).  Invested
dividends  may be in any  amount,  and  there  are no fees or  charges  for this
service. Retirement plan shareholders may only direct dividends to accounts with
identical  registrations,  i.e.,  PGI IRA Cust for John  Smith  may only go into
another account registered PGI IRA Cust for John Smith.

DIRECT DEPOSIT

If you have elected to take  distributions,  whether  dividends or dividends and
capital gains, in cash, or have  established a Systematic  Withdrawal  Plan, you
may choose to have those cash  payments  deposited  directly  into your savings,
checking or NOW bank account.  You may establish  this service by completing the
appropriate section on the Account Application when opening a new account or the
Account Options Form for an existing account.

VOLUNTARY TAX WITHHOLDING

You may request (in writing)  that PSC withhold 28% of the dividends and capital
gains distributions paid from your account (before any reinvestment) and forward
the amount  withheld to the IRS as a credit  against your federal  income taxes.
This option is not  available  for  retirement  plan  accounts  or for  accounts
subject to backup withholding.


TELEPHONE TRANSACTIONS AND RELATED LIABILITIES

Your  account  is  automatically   authorized  to  have  telephone   transaction
privileges  unless you  indicate  otherwise on your  Account  Application  or by
writing to PSC. You may purchase, sell or exchange Fund shares by telephone. For
personal assistance, call 1-800-225-6292 between 8:00 a.m. and 8:00 p.m. Eastern
time on weekdays.  Computer-assisted  transactions are available to shareholders
who have  pre-recorded  certain bank  information  (see  "FactFoneSM").  You are
strongly urged to consult with your financial representative prior to requesting
any telephone  transaction.  See "Share Price" for more information.  To confirm
that each  transaction  instruction  received by telephone is genuine,  the Fund
will  record  each  telephone  transaction,  require  the caller to provide  the
personal  identification  number  (PIN) for the  account  and send you a written


                                      -29-
<PAGE>

confirmation of each telephone  transaction.  Different  procedures may apply to
accounts that are  registered to non-U.S.  citizens or that are held in the name
of an  institution  or in the  name  of an  investment  broker-dealer  or  other
third-party.  If reasonable  procedures,  such as those described above, are not
followed,  the Fund may be liable for any loss due to unauthorized or fraudulent
instructions.  The Fund may implement other procedures from time to time. In all
other  cases,  neither  the  Fund,  PSC or  PFD  will  be  responsible  for  the
authenticity of instructions received by telephone; therefore, you bear the risk
of loss for unauthorized or fraudulent telephone transactions.

During times of economic  turmoil or market  volatility or as a result of severe
weather  or a natural  disaster,  it may be  difficult  to  contact  the Fund by
telephone to institute a redemption or exchange. You should communicate with the
Fund in writing if you are unable to reach the Fund by telephone.

FACTFONESM

FactFoneSM is an automated inquiry and telephone transaction system available to
Pioneer shareholders by dialing 1-800-225-4321.  FactFoneSM allows you to obtain
current information on your Pioneer accounts and to inquire about the prices and
yields of all publicly available Pioneer mutual funds. In addition,  you may use
FactFoneSM  to  make  computer-assisted   telephone  purchases,   exchanges  and
redemptions  from your  Pioneer  accounts if you have  activated  your  personal
identification  number ("PIN").  Telephone purchases and redemptions require the
establishment  of a bank account of record.  You are  strongly  urged to consult
with  your   financial   representative   prior  to  requesting   any  telephone
transaction.  Shareholders  whose  accounts  are  registered  in the  name  of a
broker-dealer  or other third party may not be able to use FactFoneSM.  See "How
to Buy Fund  Shares,"  "How to Exchange  Fund Shares," "How to Sell Fund Shares"
and "Telephone Transactions and Related Liabilities." Call PSC for assistance.

RETIREMENT PLANS

You should contact the Retirement Plans Department of PSC at 1-800-622-0176  for
information  relating to retirement  plans for businesses,  age-weighted  profit
sharing  plans,  Simplified  Employee  Pension  Plans,  IRAs, and Section 403(b)
retirement plans for employees of certain  non-profit  organizations  and public
school systems,  all of which are available in conjunction  with  investments in
the Fund. The Account  Application  accompanying  this Prospectus  should not be
used to establish any of these plans. Separate applications are required.

                                      -30-
<PAGE>

TELECOMMUNICATIONS DEVICE FOR THE DEAF (TDD)

If you have a hearing  disability  and you own TDD keyboard  equipment,  you can
call our TDD number toll-free at 1-800-225-1997, weekdays from 8:30 a.m. to 5:30
p.m. Eastern Time, to contact our telephone representatives with questions about
your account.

SYSTEMATIC WITHDRAWAL PLANS

If your  account  has a total  value of at least  $10,000  you may  establish  a
Systematic  Withdrawal  Plan  ("SWP")  providing  for fixed  payments at regular
intervals.  Withdrawals  from Class B share  accounts  are limited to 10% of the
value  of the  account  at the  time the plan is  implemented.  See  "Waiver  or
Reduction of Contingent  Deferred Sales Charge" for more  information.  Periodic
checks  of $50 or more will be sent to you,  or any  person  designated  by you,
monthly or quarterly,  and your periodic redemptions of shares may be taxable to
you.  Payments  can be made  either by check or  electronic  transfer  to a bank
account  designated  by you.  If you direct  that  withdrawal  checks be paid to
another  person after you have opened your account,  a signature  guarantee must
accompany your  instructions.  Purchases of Class A shares of the Fund at a time
when you have a SWP in effect may result in the  payment  of  unnecessary  sales
charges and may therefore be disadvantageous.

You may obtain  additional  information by calling PSC at  1-800-225-6292  or by
referring to the Statement of Additional Information.

REINSTATEMENT PRIVILEGE (CLASS A SHARES ONLY)

If you redeem all or part of your Class A shares of the Fund,  you may  reinvest
all or part of the redemption  proceeds without a sales charge in Class A shares
of the Fund if you send a written  request  to PSC not more  than 90 days  after
your shares were redeemed.  Your  redemption  proceeds will be reinvested at the
next  determined  net  asset  value of the  Class A shares of the Fund in effect
immediately  after  receipt of the written  request for  reinstatement.  You may
realize  a gain or loss for  federal  income  tax  purposes  as a result  of the
redemption, and special tax rules may apply if a reinvestment occurs. Subject to
the provisions  outlined under "How to Exchange Fund Shares" above, you may also
reinvest in Class A shares of other Pioneer mutual funds;  in this case you must
meet the minimum investment requirements for each fund you enter.

The 90-day  reinstatement period may be extended by PFD for periods of up to one
year for shareholders  living in areas that have experienced a natural disaster,
such as a flood, hurricane, tornado, or earthquake.

The options and services  available to shareholders,  including the terms of the
Exchange Privilege and the Pioneer Investomatic Plan, may be revised,  suspended
or terminated at any time by PFD or by the Fund.  You may establish the services
described in this section when you open your account.  You may also establish or


                                      -31-
<PAGE>

revise  many of them on an existing  account by  completing  an Account  Options
Form, which you may request by calling 1-800-225-6292.

XII. THE FUND

The Fund is a  diversified  open-end  management  investment  company  (commonly
referred to as a mutual fund) organized as a Delaware  business trust on January
31,  1996.  Prior to that time the Fund  operated  as a  Massachusetts  business
trust,  initially  reorganized  as  such on  January  31,  1985.  The  Fund  has
authorized an unlimited number of shares of beneficial interest.  As an open-end
management  investment  company,  the Fund continuously offers its shares to the
public and under normal conditions must redeem its shares upon the demand of any
shareowner at the then current net asset value per share.  See "How to Sell Fund
Shares."  The  Fund is not  required,  and  does  not  intend,  to  hold  annual
shareowner  meetings  although special meetings may be called for the purpose of
electing or removing Trustees,  changing fundamental investment  restrictions or
approving a management contract.

The Fund reserves the right to create and issue additional series of shares. The
Trustees have the authority,  without further shareowner  approval,  to classify
and  reclassify  the shares of the Fund, or any  additional  series of the Fund,
into one or more classes.  As of the date of this Prospectus,  the Trustees have
authorized the issuance of three classes of shares,  designated Class A, Class B
and  Class C.  The  shares  of each  class  represent  an  interest  in the same
portfolio of investments of the Fund.  Each class has equal rights as to voting,
redemption,  dividends and  liquidation,  except that each class bears different
distribution  and  transfer  agent  fees and may bear  other  expenses  properly
attributable to the particular class.  Class A, Class B and Class C shareholders
have exclusive voting rights with respect to the Rule 12b-1  distribution  plans
adopted  by holders  of those  shares in  connection  with the  distribution  of
shares.

In addition to the  requirements  under  Delaware law, the  Declaration of Trust
provides that a shareowner  of the Fund may bring a derivative  action on behalf
of the Fund only if the following conditions are met: (a) shareholders  eligible
to bring such derivative  action under Delaware law who hold at least 10% of the
outstanding  shares of the Fund, or 10% of the outstanding  shares of the series
or class  to which  such  action  relates,  shall  join in the  request  for the
Trustees  to  commence  such  action;  and (b) the  Trustees  must be afforded a
reasonable  amount of time to consider such  shareowner  request and investigate
the basis of such claim.  The  Trustees  shall be entitled to retain  counsel or
other  advisers in  considering  the merits of the request and shall  require an
undertaking  by the  shareholders  making such request to reimburse the Fund for
the expense of any such advisers in the event that the Trustees determine not to
bring such action.

When  issued and paid for in  accordance  with the terms of the  Prospectus  and
Statement  of  Additional  Information,  shares of the Fund are  fully-paid  and
non-assessable. Shares will remain on deposit with the Fund's transfer agent and


                                      -32-
<PAGE>

certificates will not normally be issued.  The Fund reserves the right to charge
a fee for the issuance of certificates.

XIV. INVESTMENT RESULTS

The  average  annual  total  return  (for a  designated  period  of  time) on an
investment  in the Fund may be  included in  advertisements,  and  furnished  to
existing or prospective  shareholders.  The average annual total return for each
Class is  computed  in  accordance  with the  SEC's  standardized  formula.  The
calculation  for all  Classes  assumes the  reinvestment  of all  dividends  and
distributions  at net asset  value and does not reflect the impact of federal or
state income taxes. In addition,  for Class A shares the calculation assumes the
deduction of the maximum  sales charge of 5.75%;  for Class B and Class C shares
the  calculation  reflects the  deduction of any  applicable  CDSC.  The periods
illustrated  would  normally  include  one,  five and ten  years  (or  since the
commencement  of the  public  offering  of the  shares of a Class,  if  shorter)
through the most recent calendar quarter.

One or more additional  measures and  assumptions,  including but not limited to
historical   total  returns;   distribution   returns;   results  of  actual  or
hypothetical investments;  changes in dividends,  distributions or share values;
or any graphic  illustration of such data may also be used. These data may cover
any  period of the Fund's  existence  and may or may not  include  the impact of
sales charges, taxes or other factors.

Other   investments  or  savings   vehicles  and/or  unmanaged  market  indexes,
indicators of economic  activity or averages of mutual fund results may be cited
or compared  with the  investment  results of the Fund.  Rankings or listings by
magazines,  newspapers or independent  statistical or rating  services,  such as
Lipper Analytical Services, Inc., may also be referenced.

The Fund's  investment  results will vary from time to time  depending on market
conditions,  the composition of the Fund's  portfolio and operating  expenses of
the Fund.  All  quoted  investment  results  are  historical  and  should not be
considered  representative  of what an  investment  in the  Fund may earn in any
future period. For further information about the calculation methods and uses of
the Fund's investment results, see the Statement of Additional Information.


                                      -33-
<PAGE>


                       THE PIONEER FAMILY OF MUTUAL FUNDS

                   International Growth Funds

                         Pioneer International Growth Fund
                         Pioneer Europe Fund
                         Pioneer Emerging Markets Fund
                         Pioneer India Fund

                   Growth Funds

                         Pioneer Capital Growth Fund
                         Pioneer Mid-Cap Fund
                         Pioneer Growth Shares
                         Pioneer Small Company Fund
                         Pioneer Gold Shares

                   Growth and Income Funds

                         Pioneer Equity-Income Fund
                         Pioneer Fund
                         Pioneer II
                         Pioneer Real Estate Shares

                   Income Funds

                         Pioneer Short-Term Income Trust
                         Pioneer America Income Trust
                         Pioneer Bond Fund
                         Pioneer Income Fund

                   Tax-Free Income Funds

                         Pioneer Intermediate Tax-Free Fund*
                         Pioneer Tax-Free Income Fund*
                         Pioneer New York Triple Tax-Free Fund*
                         Pioneer Massachusetts Double Tax-Free Fund*
                         Pioneer California Double Tax-Free Fund*

                   Money Market Funds

                         Pioneer U.S. Government Money Fund
                         Pioneer Cash Reserves Fund

                        *Not suitable for retirement accounts




                                      -34-
<PAGE>
PIONEER MID-CAP
FUND

60 STATE STREET
BOSTON, MASSACHUSETTS 02109

OFFICERS
JOHN F. COGAN, JR., Chairman and President
DAVID D. TRIPPLE, Executive Vice President
ROBERT W. BENSON, Vice President
WILLIAM H. KEOUGH, Treasurer
JOSEPH P. BARRI, Secretary

INVESTMENT ADVISER
PIONEERING MANAGEMENT CORPORATION

CUSTODIAN
BROWN BROTHERS HARRIMAN & CO.

INDEPENDENT PUBLIC ACCOUNTANTS
ARTHUR ANDERSEN LLP

LEGAL COUNSEL
HALE AND DORR

PRINCIPAL UNDERWRITER
PIONEER FUNDS DISTRIBUTOR, INC.

SHAREHOLDER SERVICES AND TRANSFER AGENT
PIONEERING SERVICES CORPORATION
60 State Street
Boston, Massachusetts 02109
Telephone: 1-800-225-6292

SERVICE INFORMATION
If you would like information on the following, please call:
Existing and new accounts, prospectuses,
 applications, service forms
 and telephone transactions ...................................  1-800-225-6292
FactFone(SM)
 Automated fund yields and prices, account
 information and computer transactions  .......................  1-800-225-4321
Retirement plans ..............................................  1-800-622-0176
Toll-free fax .................................................  1-800-225-4240
Telecommunications Device for the Deaf (TDD) .....               1-800-225-1997

0196-2857
(c)Pioneer Funds Distributor, Inc.

                                     -35-
<PAGE>


                              PIONEER MID-CAP FUND
                                 60 State Street
                           Boston, Massachusetts 02109

                       STATEMENT OF ADDITIONAL INFORMATION

                       Class A, Class B and Class C Shares

                                February 1, 1996


This Statement of Additional Information (Part B of the Registration  Statement)
is not a  Prospectus,  but should be read in  conjunction  with the  Prospectus,
dated  February 1, 1996. A copy of the Prospectus can be obtained free of charge
by calling  Shareholder  Services at 1-  800-225-6292  or by written  request to
Pioneer  Mid-Cap Fund (the  "Fund") at 60 State  Street,  Boston,  Massachusetts
02109.

                                TABLE OF CONTENTS
                                                                       Page

 1.      Investment Policies and Restrictions...........................2
 2.      Management of the Fund.........................................6
 3.      Investment Adviser.............................................11
 4.      Underwriting Agreement and Distribution Plans..................14
 5.      Shareholder Servicing/Transfer Agent...........................16
 6.      Custodian......................................................17
 7.      Principal Underwriter..........................................17
 8.      Independent Public Accountants.................................18
 9.      Portfolio Transactions.........................................18
10.      Tax Status and Dividends.......................................19
11.      Description of Shares..........................................23
12.      Certain Liabilities............................................24
13.      Letter of Intention............................................24
14.      Systematic Withdrawal Plan.....................................25
15.      Determination of Net Asset Value...............................26
16.      Investment Results.............................................27
17.      Financial Statements...........................................29
         Appendix A.....................................................31
         Appendix B.....................................................36


                THIS STATEMENT OF ADDITIONAL INFORMATION IS NOT A
                PROSPECTUS AND IS AUTHORIZED FOR DISTRIBUTION TO
              PROSPECTIVE INVESTORS ONLY IF PRECEDED OR ACCOMPANIED
                           BY AN EFFECTIVE PROSPECTUS.


<PAGE>


1. INVESTMENT POLICIES AND RESTRICTIONS

The  Fund's  current  prospectus  (the  "Prospectus")  presents  the  investment
objective  and  the  principal  investment  policies  of  the  Fund.  Additional
investment  policies and a further description of some of the policies described
in the Prospectus appear below.

The  following  policies  and  restrictions  supplement  those  discussed in the
Prospectus.  Whenever  an  investment  policy  or  restriction  states a maximum
percentage of the Fund's assets that may be invested in any security or presents
a policy regarding quality standards,  this standard or other restrictions shall
be  determined  immediately  after  and as a result  of the  Fund's  investment.
Accordingly,  any later increase or decrease  resulting from a change in values,
net assets or other  circumstances will not be considered in determining whether
the investment complies with the Fund's investment objectives and policies.

Lending of Portfolio Securities


The Fund may lend  portfolio  securities  to member  firms of the New York Stock
Exchange,  under  agreements  which  would  require  that the  loans be  secured
continuously by collateral in cash,  cash  equivalents or United States ("U.S.")
Treasury Bills  maintained on a current basis at an amount at least equal to the
market value of the  securities  loaned.  The Fund would continue to receive the
equivalent  of the  interest or dividends  paid by the issuer on the  securities
loaned  as well  as the  benefit  of an  increase  in the  market  value  of 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 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 of the  securities  fail
financially.  The Fund will lend portfolio  securities  only to firms which have
been  approved  in advance by the Board of  Trustees,  which  will  monitor  the
creditworthiness of any such firms. At no time would the value of the securities
loaned exceed 5% of the value of the Fund's total assets.

Forward Foreign Currency Transactions

The Fund may engage in foreign currency transactions.  These transactions may be
conducted  on a spot,  i.e.,  cash  basis,  at the spot rate for  purchasing  or
selling currency  prevailing in the foreign  exchange market.  The Fund also has
authority  to deal in forward  foreign  currency  exchange  contracts  involving
currencies of the  different  countries in which the Fund will invest as a hedge
against  possible   variations  in  the  foreign  exchange  rate  between  these
currencies  and the  U.S.  dollar.  This  is  accomplished  through  contractual
agreements to purchase or sell a specified  currency at a specified  future date
and  price set at the time of the  contract.  The  Fund's  dealings  in  forward
foreign   currency   contracts  will  be  limited  to  hedging  either  specific
transactions or portfolio positions. Transaction hedging is the purchase or sale


                                      -2-
<PAGE>

of forward foreign  currency  contracts with respect to specific  receivables or
payables of the Fund,  accrued in connection with the purchase and sale of their
portfolio securities denominated in foreign currencies. Portfolio hedging is the
use of forward foreign currency contracts to offset portfolio security positions
denominated or quoted in such foreign currencies. There is no guarantee that the
Fund will be engaged in hedging  activities when adverse exchange rate movements
occur.  The  Fund  will  not  attempt  to  hedge  all of its  foreign  portfolio
positions, and the Fund will enter into such transactions only to the extent, if
any, deemed appropriate by the investment adviser.  The Fund will not enter into
speculative forward foreign currency contracts.

If the Fund enters into a forward  contract to purchase  foreign  currency,  the
custodian  bank will  segregate  cash or high grade liquid debt  securities in a
separate  account in an amount equal to the value of the total assets  committed
to the  consummation  of such forward  contract.  Those assets will be valued at
market  daily and if the value of the assets in the separate  account  declines,
additional  cash or securities  will be placed in the accounts so that the value
of the account  will equal the amount of the Fund's  commitment  with respect to
such contracts.

Hedging  against  a  decline  in the  value of a  currency  does  not  eliminate
fluctuations  in the prices of  portfolio  securities  or prevent  losses if the
prices of such securities decline.  Such transactions also limit the opportunity
for gain if the value of the hedged currency should rise.  Moreover,  it may not
be possible  for the Fund to hedge  against a  devaluation  that is so generally
anticipated  that the Fund is not able to  contract  to sell the  currency  at a
price  above the  devaluation  level  they  anticipate.  The cost to the Fund of
engaging  in  foreign  currency  transactions  varies  with such  factors as the
currency involved,  the size of the contract,  the length of the contract period
and the  market  conditions  then  prevailing.  Since  transactions  in  foreign
currency and forward  contracts are usually  conducted on a principal  basis, no
fees or commissions are involved. The Fund may close out a forward position in a
currency  by selling the forward  contract  or by  entering  into an  offsetting
forward contract.

Real Estate Investment Trusts and Associated Risk Factors

The Fund may invest up to 5% of its assets in shares of REITs.  REITs are pooled
investment  vehicles which invest  primarily in income  producing real estate or
real estate related loans or interests. REITs are generally classified as equity
REITs,  mortgage  REITs or a combination  of equity and mortgage  REITs.  Equity
REITs invest the majority of their assets  directly in real  property and derive
income  primarily  from the  collection of rents.  Equity REITs can also realize
capital gains by selling  properties  that have  appreciated in value.  Mortgage
REITs invest the majority of their  assets in real estate  mortgages  and derive
income from the collection of interest payments.  Like investment companies such
as the Fund, REITs are not taxed on income distributed to shareholders  provided
they comply with several  requirements of the Internal  Revenue Code of 1986, as
amended (the "Code").  The Fund will indirectly bear its proportionate  share of
any expenses  paid by REITs in which it invests in addition to the expenses paid
by the Fund.

Investing  in REITs  involves  certain  unique  risks in addition to those risks
associated with investing in the real estate  industry in general.  Equity REITs


                                      -3-
<PAGE>

may be affected by changes in the value of the underlying  property owned by the
REITs,  while  mortgage  REITs may be  affected  by the  quality  of any  credit
extended.  REITs are dependent upon management skills, are not diversified,  and
are subject to the risks of financing projects.  REITs are subject to heavy cash
flow dependency, default by borrowers,  self-liquidation,  and the possibilities
of failing to qualify for the exemption  from tax for  distributed  income under
the Code and failing to maintain their  exemptions  from the Investment  Company
Act of 1940, as amended (the "1940 Act").  REITs whose underlying assets include
long-term  health care  properties,  such as nursing,  retirement  and  assisted
living homes, may be impacted by federal regulations  concerning the health care
industry.

REITs (especially  mortgage REITs) are also subject to interest rate risks. When
interest  rates  decline,  the  value  of a  REIT's  investment  in  fixed  rate
obligations can be expected to rise.  Conversely,  when interest rates rise, the
value of a REIT's  investment  in fixed  rate  obligations  can be  expected  to
decline.  In contrast,  as interest rates on adjustable  rate mortgage loans are
reset periodically,  yields on a REIT's investments in such loans will gradually
align themselves to reflect changes in market interest rates,  causing the value
of such investments to fluctuate less  dramatically in response to interest rate
fluctuations than would investments in fixed rate obligations.

Investing in REITs involves risks similar to those  associated with investing in
mid capitalization  companies.  REITs may have limited financial resources,  may
trade less  frequently and in a limited volume and may be subject to more abrupt
or erratic price  movements than larger company  securities.  Historically,  mid
capitalization  stocks, such as REITs, have been more volatile in price than the
larger  capitalization  stocks  included in the  Standard & Poor's  Index of 500
Common Stocks.

Other Policies and Risks

It is the policy of the Fund not to concentrate its investments in securities of
companies  in any  particular  industry.  In the  opinion  of the  staff  of the
Securities and Exchange Commission (the "Commission"), investments are deemed to
be concentrated in a particular  industry if such investments  constitute 25% or
more of the Fund's total assets.

Investment Restrictions

Fundamental  Investment  Restrictions.  The Fund has adopted certain  additional
investment restrictions which may not be changed without the affirmative vote of
the  holders  of a  "majority"  (as  defined  in the  1940  Act)  of the  Fund's
outstanding voting securities. The Fund may not:

         (1)......Issue  senior  securities,  except as  permitted by the Fund's
borrowing,  lending  and  commodity  restrictions,  and  for  purposes  of  this
restriction,  the issuance of shares of beneficial  interest in multiple classes
or series,  the purchase or sale of options,  futures  contracts  and options on
futures  contracts,  forward  commitments,  forward foreign exchange  contracts,
repurchase agreements,  reverse repurchase  agreements,  dollar rolls, swaps and
any other financial  transaction  entered into pursuant to the Fund's investment
policies  as  described  in the  Prospectus  and this  Statement  of  Additional


                                      -4-
<PAGE>

Information and in accordance with applicable SEC pronouncements, as well as the
pledge, mortgage or hypothecation of the Fund's assets within the meaning of the
Fund's fundamental  investment restriction regarding pledging, are not deemed to
be senior securities.

         (2)......Borrow  money,  except  from banks as a  temporary  measure to
facilitate the meeting of redemption  requests or for extraordinary or emergency
purposes and except pursuant to reverse  repurchase  agreements or dollar rolls,
in all  cases in  amounts  not  exceeding  33 1/3% of the  Fund's  total  assets
(including  the amount  borrowed)  taken at market value.  The Fund will not use
leverage to attempt to increase  income.  The Fund will not purchase  securities
while outstanding borrowings (including reverse repurchase agreements and dollar
rolls) exceed 10% of the Fund's total assets.

         (3)......Guarantee  the securities of any other company, or , mortgage,
pledge, hypothecate or assign or otherwise encumber as security for indebtedness
its securities or receivables in an amount exceeding the amount of the borrowing
secured thereby.

         (4)......Purchase  securities of a company if the purchase would result
in the Fund's  having more than 5% of the value of its total assets  invested in
securities of such company.

         (5)......Purchase  securities of a company if the purchase would result
in the Fund's owning more than 10% of the outstanding  voting securities of such
company.

         (6)......Act  as an  underwriter,  except  as it  may  deemed  to be on
underwriter in a sale of restricted securities held in its portfolio.

         (7)......Make  loans,  except by purchase of debt  obligations in which
the Fund may invest  consistent with its investment  policies,  by entering into
repurchase  agreements or through the lending of portfolio  securities,  in each
case only to the  extent  permitted  by the  Prospectus  and this  Statement  of
Additional Information.

         (8)......Invest  in real estate,  commodities  or commodity  contracts,
except  that  the  Fund may  invest  in real  estate  investment  trusts  and in
financial  futures  contracts  and related  options  and in any other  financial
instruments  which may be deemed to be  commodities  or  commodity  contracts in
which the Fund is not prohibited  from  investing by the Commodity  Exchange Act
and the rules and regulations thereunder

         (9)......Purchase  securities  on "margin" or effect " short  sales" of
securities.

The Fund does not intend to enter into any reverse  repurchase  agreement,  lend
portfolio  securities or invest in securities  index put and call  warrants,  as
described in fundamental investment  restrictions (2), (6) and (7) above, during
the coming year.

                                      -5-
<PAGE>

Non-fundamental Investment Restrictions.

It is the policy of the Fund not to concentrate its investments in securities of
companies  in any  particular  industry.  In  the  opinion  of  the  Commission,
investments  are  concentrated  in a  particular  industry  if such  investments
aggregate  25% or more of the Fund's total  assets.  The Fund's  policy does not
apply to investments in U.S. Government securities. The Fund has agreed to abide
by the  foregoing  non-fundamental  policy which it will not change  without the
affirmative  vote of a majority of the Fund's  outstanding  shares of beneficial
interest.

The following  restrictions have been designated as  non-fundamental  and may be
changed  by a  vote  of  the  Fund's  Board  of  Trustees  without  approval  of
shareholders.

The Fund may not:

         (1) purchase or retain the securities of any company if officers of the
Fund or  Trustees  of the Fund,  or  officers  and  directors  of its adviser or
principal  underwriter,  individually  own  more  than  one-half  of 1%  of  the
securities of such company or collectively own more than 5% of the securities of
such company; or

         (2) invest in  securities  of other  registered  investment  companies,
except  by  purchases  in the open  market  including  only  customary  brokers'
commissions,  and  except  as  they  may be  acquired  as part  of a  merger,  a
consolidation or an acquisition of assets; or

         (3) purchase (a)  securities  which at the time of  investment  are not
readily marketable,  (b) securities the disposition of which is restricted under
federal  securities  laws  (excluding   restricted  securities  that  have  been
determined by the Trustees of the Fund (or the person designated by them to make
such  determinations)  to be readily  marketable) and (c) repurchase  agreements
maturing in more than seven days,  if, as a result,  more than 15% of the Fund's
net assets would be invested in securities described in (a), (b), and (c) above.

In addition,  in connection  with the offering of its shares in various  states,
the Fund has agreed not to: (1) invest in puts, calls, straddles, spreads or any
combination  thereof, or in oil, gas or other mineral exploration or development
leases or programs; (2) invest more than 5% of its assets inequity securities of
any issuer which are not readily marketable,  i.e.,  securities for which a bona
fide market does not exist at the time of purchase or subsequent valuation;  (3)
pledge its portfolio  securities,  unless its net assets less pledged securities
continues to amount to at least 90% of the offering price;  (4) invest more than
5% of its total  assets in warrants,  valued at the lower of cost or market,  or
more than 2% of its total assets in warrants, so valued, which are not listed on
the New York or American Stock Exchanges;  and (5) invest in real estate limited
partnerships.

2. MANAGEMENT OF THE FUND

The Fund's Board of Trustees  provides broad supervision over the affairs of the
Fund.  The  executive  officers  of the  Fund  are  responsible  for the  Fund's
operations,  which is managed by PMC. The Trustees and executive officers of the
Fund are listed below, together with their principal occupations during the past
five years. An asterisk indicates those Trustees who are "interested persons" of
the Fund within the meaning of the 1940 Act.

                                      -6-
<PAGE>

JOHN F. COGAN, JR.,*              President and Director of The Pioneer Group, 
Chairman of the Board,            Inc. ("PGI");Chairman and a Director of 
President and Trustee             Pioneering Management Corporation ("PMC"),
                                  Pioneer Funds Distributor, Inc. ("PFD");
                                  Pioneer Goldfields Limited ("PGL"); Director
                                  of Pioneering Services Corporation ("PSC"),
                                  Pioneer Capital Corporation ("PCC") and
                                  Forest-Starma ( a Russian corporation);
                                  President and Director of Pioneer Plans
                                  Corporation ("PPC"), Pioneer Investment Corp.
                                  ("PIC"), Pioneer Metals and Technology, Inc.
                                  ("PMT"), Pioneer International Corp.
                                  ("Pintl"), Luscina, Inc. Pioneer First Russia,
                                  Inc. ("First Russia"), Pioneer Omega, Inc.
                                  ("Omega") and Theta Enterprises, Inc.;
                                  Chairman of the Supervisory Board of Pioneer
                                  Fonds Marketing GMbH ("Pioneer GmbH"); Member
                                  of the Supervisory Board of Pioneer First
                                  Polish Trust Fund Joint Stock Company
                                  ("PFPT"); Chairman and President of all the
                                  Pioneer Funds and Chairman and Partner, Hale
                                  and Dorr (counsel to the Fund).

RICHARD H. EGDAHL, M.D.,          Professor of Management, Boston University 
Trustee                           School of Management, since 1988; Professor of
Boston University                 Public Health, Boston University School of 
Health Policy                     Public Health; Professor of Surgery, Boston 
Institute                         University School of Medicine and Boston 
53 Bay State Road                 University Health Policy Institute; Director, 
Boston, Massachusetts             Boston University Medical Center; Executive
                                  Vice President and Vice Chairman of the Board,
                                  University Hospital; Academic Vice President
                                  for Health Affairs, Boston University;
                                  Director, Essex Investment Management Company,
                                  Inc. (investment adviser), Health Payment
                                  Review, Inc. (health care containment software
                                  firm), Mediplex Group, Inc. (nursing care
                                  facilities firm), Peer Review Analysis, Inc.
                                  (health care utilization management firm);
                                  Springer-Verlag New York, Inc. (publisher);
                                  Honorary Trustee, Franciscan Children's
                                  Hospital and Trustee of all the Pioneer mutual
                                  funds.

MARGARET B.W. GRAHAM,             Founding Director, Winthrop Group, Inc, a 
Trustee                           consulting firm, since 1982: Manager of 
The Keep                          Research Operations, Xerox Palo Alto Research 
Post Office Box 110               Center, between 1991 and 1994; Professor of 
Little Deer Isle, Maine           Operations Management and Management of
                                  Technology, Boston University School of
                                  Management ("BUSM"), between 1988 and 1993;
                                  and Trustee of all the Pioneer mutual funds,
                                  except Pioneer Variable Contracts Trust.


                                      -7-
<PAGE>

JOHN W. KENDRICK,                 Professor Emeritus and Adjunct Scholar, George
Trustee                           Washington University; Economic Consultant
6363 Waterway Drive               and Director, American Productivity and 
Falls Church, Virginia            Quality Center; American Enterprise Institute
                                  and Trustee of all the Pioneer mutual funds,
                                  except Pioneer Variable Contracts Trust.


MARGUERITE A. PIRET,              President, Newbury, Piret & Company, Inc.
Trustee                           (a merchant banking firm); Trustee of all the 
One Boston Place,                 Pioneer mutual funds.
Suite 2363
Boston, Massachusetts

DAVID D. TRIPPLE*,                Executive Vice President and Director of PGI
Trustee and Executive             since 1993; Director of PFD, since 1989; 
Vice President                    Director of PCC, PIC, Pintl, and Corporation;
                                  President (since 1993); Director, President
                                  and, Chief Investment Officer of PMC and
                                  Trustee of all the Pioneer mutual funds.


STEPHEN K. WEST,                  Partner, Sullivan & Cromwell (a law firm); 
Trustee                           Trustee, The Winthrop Focus Funds (mutual 
125 Broad Street                  funds) and Trustee of all the Pioneer mutual
New York, New York                funds.


JOHN WINTHROP,                    President, John Winthrop & Co., Inc. (a 
Trustee                           private investment firm); Director of NUI 
One North Adgers Wharf            Corp; Trustee of Alliance Capital Reserves, 
Charleston, South Carolina        Alliance Government Reserves and Alliance Tax 
                                  Exempt Reserves and Trustee of all the Pioneer
                                  mutual funds, except Pioneer Variable 
                                  Contracts Trust.




WILLIAM H. KEOUGH,                Senior Vice President, Chief Financial Officer
Treasurer                         and Treasurer of PGI;  Treasurer of PFD,
                                  PMC, PSC, PCC, PIC, PIntl, PMT, PGL, and
                                  Pioneer SBIC Corporation; Treasurer and
                                  Director of PPC and Treasurer of all the
                                  Pioneer mutual funds.



JOSEPH P. BARRI,                  Secretary of PGI, PMC, PPC, PIC, PIntl, PMT, 
Secretary                         and PCC; Clerk of PFD and PSC; Partner, Hale
                                  and Dorr (counsel to the Fund) and Secretary
                                  of all the Pioneer mutual funds.


                                      -8-
<PAGE>


ERIC W. RECKARD,                  Manager of Fund Accounting and Compliance of 
Assistant Treasurer               Business Analysis of PGI prior to May 1994 and
                                  Assistant PMC since May, 1994; Manager of
                                  Auditing and Treasurer of all the Pioneer
                                  mutual funds..



ROBERT P. NAULT,                  General Counsel of PGI since 1995; formerly of
Assistant                         Hale and Secretary Dorr (counsel to the Fund)
                                  where he most recently served as a junior
                                  partner and Assistant Secretary of all the
                                  Pioneer mutual funds..


ROBERT W. BENSON,                 Senior President of PMC.
Vice President

Each of the above  (except  Mr.  Benson)  is also an officer  and/or  Trustee or
Director of the Pioneer  mutual funds listed  below.  The Fund's  Agreement  and
Declaration of Trust (the  "Declaration of Trust")  provides that the holders of
two-thirds of its outstanding shares may vote to remove a Trustee of the Fund at
any special meeting of  shareholders.  See  "Description  of Shares" below.  The
business  address of all  officers  is 60 State  Street,  Boston,  Massachusetts
02109.

As of the date of this SAI, all of the outstanding  capital stock of PMC and PSC
is  owned  by  PGI,  a  publicly-owned  Delaware  corporation,  and  all  of the
outstanding  capital  stock of PFD is  indirectly  owned by PGI. The table below
lists all the  Pioneer  mutual  funds  currently  offered  to the public and the
investment adviser and principal underwriter for each fund.

                                            Investment       Principal
Fund Name                                    Adviser        Underwriter

Pioneer Fund                                   PMC              PFD
Pioneer II                                     PMC              PFD
Pioneer Mid-Cap Fund                           PMC              PFD
Pioneer Growth Shares                          PMC              PFD
Pioneer Capital Growth Fund                    PMC              PFD
Pioneer Equity-Income Fund                     PMC              PFD
Pioneer Small Company                          PMC              PFD
Pioneer Gold Shares                            PMC              PFD
Pioneer Real Estate Shares                     PMC              PFD
Pioneer Europe Fund                            PMC              PFD
Pioneer International Growth Fund              PMC              PFD
Pioneer Emerging Markets Fund                  PMC              PFD
Pioneer India Fund                             PMC              PFD
Pioneer Bond Fund                              PMC              PFD
Pioneer America Income Trust                   PMC              PFD
Pioneer Short-Term Income Fund                 PMC              PFD


                                      -9-
<PAGE>

Pioneer Income Fund                            PMC              PFD
Pioneer Tax-Free Income Fund                   PMC              PFD
Pioneer Intermediate Tax-Free Fund             PMC              PFD
Pioneer California Double Tax-Free Fund        PMC              PFD
Pioneer New York Triple Tax-Free Fund          PMC              PFD
Pioneer Massachusetts Double Tax-Free Fund     PMC              PFD
Pioneer Cash Reserves Fund                     PMC              PFD
Pioneer U.S. Government Money Fund             PMC              PFD
Pioneer Tax-Free Money Fund                    PMC              PFD
Pioneer Interest Shares, Inc.                  PMC               *

Pioneer Variable Contracts Trust               PMC              **


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

*    This fund is a closed-end fund.
**   This is a series of eight separate portfolios designed to provide
     investment vehicles for the variable annuity and variable life insurance
     contracts of various insurance companies or for certain qualified pension
     plans.

To the knowledge of the Fund, no officer or trustee of the Fund owned 5% or more
of the issued and  outstanding  shares of PGI on the date of this  Statement  of
Additional  Information,  except Mr. Cogan who then owned  approximately  15% of
such shares.

                      Compensation of Officers and Trustees


The Fund pays no salaries or compensation to any of its officers.  The Fund pays
an annual  trustees' fee of $500 plus $120 per meeting  attended to each Trustee
who is not affiliated  with PMC, PFD or PGI and pays an annual  trustees' fee of
$500 plus  expenses to each  Trustee  affiliated  with PMC, PFD or PGI. Any such
fees and expenses paid to  affiliates  or interested  persons of PMC, PFD or PGI
are reimbursed to the Fund under its Management Contract.


The  following  table  sets  forth  certain  information  with  respect  to  the
compensation  of each  Trustee of the Fund for the fiscal year ending  September
30, 1995:
<TABLE>
<CAPTION>

                                                      Pension or
                                                      Retirement             Total
                                                       Benefits           Compensation
                                 Compensation         Accrued as         from Fund and
                                   Aggregate            Part of          Pioneer Family
Name of Trustee                  from the Fund*      Fund's Expenses        of Funds**


<S>                             <C>                        <C>             <C>   
John F. Cogan, Jr.              $      0+                  $0              $   0+
Richard H. Egdahl, M.D.              4,500                  0              $55,650
Margaret B.W. Graham                 4,500                  0              $55,650
John W. Kendrick                     4,500                  0              $55,650
Marguerite A. Piret                  6,063                  0              $66,650
David D. Tripple                       0+                   0              $   0+


                                      -10-
<PAGE>

Stephen K. West                      6,167                  0              $63,650
John Winthrop                        5,750                  0              $63,650
                                     ------                 -              ------
                                   $12,940                  0             $413,000
                    ----------------------------------------------------------------------------

<FN>

+    PMC fully reimburses the Fund and the other funds in the Pioneer Family of
     Funds for compensation paid to Messrs. Cogan and Tripple.
*    As of Fund's fiscal year end.
**   Estimated as of December 31, 1995 (calendar year end for all Pioneer mutual
     funds).
</FN>
</TABLE>

3. INVESTMENT ADVISER

The Fund has contracted with PMC, 60 State Street, Boston, Massachusetts, to act
as its investment  adviser.  A description of the services  provided to the Fund
under  its  management  contract  and the  expenses  paid by the Fund  under the
contract is set forth in the  Prospectus  under the caption  "Management  of the
Fund."

The term of the management contract is one year and is renewable annually by the
vote of a majority of the Board of Trustees of the Fund (including a majority of
the Board of Trustees who are not parties to the contract or interested  persons
of any such  parties).  The vote must be cast in person at a meeting  called for
the purpose of voting on such renewal.  The contract  terminates if assigned and
may be  terminated  without  penalty by either  party upon sixty  days'  written
notice  by vote of the Board of  Directors  or  Trustees  or a  majority  of the
outstanding voting securities. Pursuant to the management contract, PMC will not
be liable for any error of judgment or mistake of law or for any loss  sustained
by reason of the  adoption of any  investment  policy or the  purchase,  sale or
retention of any securities on the  recommendation of PMC. PMC, however,  is not
protected against liability by reason of willful misfeasance, bad faith or gross
negligence  in the  performance  of its  duties  or by  reason  of its  reckless
disregard  of  its  obligations  and  duties  under  the  respective  management
contract.

As compensation for its management  services and expenses incurred,  and certain
expenses  which PMC incurs on behalf of the Fund,  the Fund pays PMC a basic fee
of 0.625% of the Fund's average daily net assets (the "Basic Fee").  One twelfth
(1/12) of this annual Basic Fee is applied to the Fund's  average net assets for
the current month, giving a dollar amount which is the monthly fee.

Performance Fee Adjustment

The Basic Fee is  subject  to an upward or  downward  adjustment,  depending  on
whether  and to what  extent,  the  investment  performance  of the fund for the
performance  period  exceeds,  or is exceeded by, the record of the Standard and
Poors Mid-Cap 400 Index of mid-capitalization stocks (the "Index") over the same
period.  The Index is comprised of 400 domestic  stocks  chosen for market size,
liquidity and industry group representation. It is a market-value weighted index
and was the first  benchmark of midcap stock price  movements.  The  performance
period  consists  of the  current  month and the  prior 35 months  ("performance
period").  Each  percentage  point of  difference  (up to a maximum of +/-10) is
multiplied by a performance  adjustment  rate of 0.02%.  The maximum  annualized
adjustment rate is


                                      -11-
<PAGE>

+/- 0.20%.  This  performance  comparison is made at the end of each month.  One
twelfth (1/12) of this rate is then applied to the fund's average net assets for
the  entire  performance  period,  giving a dollar  amount  that is added to (or
subtracted from) the Basic Fee.

The Fund's  performance is calculated  based on net asset value. For purposes of
calculating  the  performance   adjustment,   any  dividends  or  capital  gains
distributions  paid by the Fund are treated as if  reinvested  in Fund shares at
the net asset value as of the record date for payment.  The record for the Index
is based on change in value and is adjusted for any cash  distributions from the
companies whose securities whose securities comprise the Index.

Application of Performance Adjustment

The  application of the  performance  adjustment is illustrated by the following
hypothetical  example,  assuming  that the net  asset  value of the Fund and the
level of the  Index  were $10 and 100,  respectively,  on the  first  day of the
performance period.

               Investment Performance *           Cumulative Change

           First Day         End of Period     Absolute     Percentage
                                                              Points

Fund        $ 10                $ 13            +$ 3          + 30%
Index        100                 123            + 23          + 23%

* Reflects  performance  at net asset  value.  Any  dividends  or capital  gains
distributions  paid by the Fund are  treated as if  reinvested  in shares of the
Fund at net  asset  value  as of the  payment  date  and any  dividends  paid on
securities  which  comprise  the  Index  are  treated  as if  reinvested  on the
ex-dividend date.

The  difference  in  relative  performance  for  the  performance  period  is +7
percentage points. Accordingly,  the annualized management fee rate for the last
month of the performance  period would be calculated as follows:  One-twelfth of
the Basic Fee of 0.625% would be applied to the Fund's  average daily net assets
for the month resulting in a dollar amount.  The +7 percentage  point difference
is multiplied by the  performance  adjustment  rate of 0.02% producing a rate of
0.14%.  One-twelfth of this rate is then applied to the average daily net assets
of the Fund over the  performance  period  resulting in a dollar amount which is
added to the dollar  amount of the Basic  Fee.  The  management  fee paid is the
dollar  amount  calculated  for  the  performance   period.  If  the  investment
performance of the Fund during the performance period was exceeded by the record
of the Index, the dollar amount of performance adjustment would be deducted from
the Basic Fee.

                                      -12-
<PAGE>

Because the adjustment to the Basic Fee is based on the comparative  performance
of the Fund and the record of the Index,  the controlling  factor is not whether
Fund  performance  is up or down, but whether it is up or down more or less than
the record of the Index.  Moreover,  the  comparative  investment of the Fund is
based solely on the relevant performance period without regard to the cumulative
performance over a longer or shorter period of time.

Phase-In of Performance Adjustment

For the  period  starting  February  1,  1996  and  ending  June 30,  1996,  the
management  fee shall be paid at the annual  rate of 0.50% of average net assets
up to $250 million, 0.48% of the next %50 million in net assets and 0.45% on the
net assets  exceeding $300 million.  Based upon the Fund's  expected net assets,
this  fee  schedule  is  expected  to  result  in  an  effective   fee  rate  of
approximately 0.46% for such period. Because the performance adjustment operates
on a prospective basis only,  neither investment results nor average assets from
periods   prior  to  February  1,  1996  will  be   considered  in  the  initial
implementation  of the  performance  based  fee.  Additionally,  no  performance
adjustment  increasing  the Basic Fee will be made until a 12 month  performance
record,  starting in January 1997, has accrued.  A performance  adjustment  that
would  have the  effect of  lowering  the Basic Fee will be made after a 6 month
performance record, starting in February 1996, has accrued.

Accordingly, starting with July 1996, the Basic Fee will take effect and will be
adjusted  for the relative  performance  of the Fund and the record of the Index
from  February  1,  1996  onward if such  adjustment  would  have the  effect of
lowering the Basic Fee. The  application of a negative  adjustment will continue
through  December 31, 1996.  Starting with January,  1997, the Basic Fee will be
adjusted to reflect both increases and decreases  based upon the Fund's relative
performance relative to the Index from February 1, 1996 onward.

The  performance  adjustment will be applied against assets over the same period
of  performance  and  thereafter  a new month  will be added to the  period  for
purposes of measuring performance and the average assets until the period equals
36 months.  After 36 months have elapsed from February 1, 1996, the  performance
period will consist of the most recent month plus the previous 35 months.

During its fiscal years ended  September 30, 1993,  1994 and 1995, the Fund paid
or owed total management fees to PMC of approximately $4,295,000, $4,801,000 and
$4,701,000  pursuant to a management  contract  previously in effect under which
fees were paid at the annual  rate of 0.50% of the average net assets up to $250
million.,  0.48% of the next 50  million  in assets  and 0.45% on the net assets
exceeding $300 million.

                                      -13-
<PAGE>

4. UNDERWRITING AGREEMENT AND DISTRIBUTION PLANS

The Fund  entered into an  Underwriting  Agreement  with PFD.  The  Underwriting
Agreement will continue from year to year if annually  approved by the Trustees.
The  Underwriting  Agreement  provides  that  PFD  will  bear  expenses  for the
distribution of the Fund's shares, except for expenses incurred by PFD for which
it is reimbursed by the Fund under the Plan. PFD bears all expenses it incurs in
providing  services  under the  Underwriting  Agreement.  Such expenses  include
compensation to its employees and  representatives and to securities dealers for
distribution  related  services  performed  for the Fund.  PFD also pays certain
expenses in connection with the distribution of the Fund's shares, including the
cost  of  preparing,   printing  and  distributing  advertising  or  promotional
materials,   and  the  cost  of  printing  and  distributing   prospectuses  and
supplements to prospective shareholders.  The Fund bears the cost of registering
its  shares  under  federal  and state  securities  law and the laws of  certain
foreign countries.  The Fund and PFD have agreed to indemnify each other against
certain liabilities,  including liabilities under the Securities Act of 1933, as
amended.  Under the  Underwriting  Agreement,  PFD will use its best  efforts in
rendering services to the Fund.

The Fund has  adopted a plan of  distribution  pursuant  to Rule 12b-1 under the
1940 Act with  respect  to its Class A shares  (the  "Class A Plan"),  a plan of
distribution  with respect to its Class B shares (the "Class B Plan") and a plan
of  distribution  with  respect  to its  Class C  shares  (the  "Class  C Plan")
(together, the "Plans").

Class A Plan

Pursuant to the Class A Plan the Fund may reimburse PFD for its  expenditures in
financing any activity  primarily intended to result in the sale of Fund shares.
Certain  categories  of such  expenditures  have been  approved  by the Board of
Trustees and are set forth in the Prospectus.  See "Distribution  Plans" in each
Prospectus. The expenses of the Fund pursuant to the Class A Plan are accrued on
a fiscal  year basis and may not  exceed,  with  respect to Class A shares,  the
annual rate of 0.25% of the Fund's  average  annual net assets  attributable  to
Class A.

Class B Plan

The Class B Plan provides that the Fund shall pay PFD, as the Fund's distributor
for its Class B shares,  a daily  distribution  fee equal on an annual  basis to
0.75% of the Fund's average daily net assets  attributable to Class B shares and
will pay PFD a service fee equal to 0.25% of the Fund's average daily net assets
attributable to Class B shares (which PFD will in turn pay to securities dealers
which  enter  into a sales  agreement  with  PFD at a rate of up to 0.25% of the
Fund's  average  daily  net  assets  attributable  to  Class B  shares  owned by
investors  for whom that  securities  dealer is the holder or dealer of record).
This service fee is intended to be in consideration of personal  services and/or
account  maintenance  services  rendered by the dealer  with  respect to Class B
shares.  PFD will advance to dealers the first-year  service fee at a rate equal
to 0.25% of the amount invested.  As compensation  therefor,  PFD may retain the
service  fee paid by the Fund with  respect  to such  shares  for the first year
after purchase.  Dealers will become  eligible for additional  service fees with
respect to such shares  commencing in the thirteenth  month following  purchase.
Dealers  may from time to time be  required to meet  certain  other  criteria in
order to receive  service fees. PFD or its affiliates are entitled to retain all


                                      -14-
<PAGE>

service  fees  payable  under the  Class B Plan for which  there is no dealer of
record  or for  which  qualification  standards  have not  been  met as  partial
consideration  for  personal  services  and/or  account   maintenance   services
performed by PFD or its affiliates for shareholder accounts.


The  purpose  of  distribution  payments  to PFD  under  the  Class B Plan is to
compensate PFD for its  distribution  services to the Fund. PFD pays commissions
to dealers as well as  expenses of printing  prospectuses  and reports  used for
sales  purposes,  expenses with respect to the preparation and printing of sales
literature  and  other   distribution-related   expenses,   including,   without
limitation,  the cost  necessary to provide  distribution-related  services,  or
personnel,  travel office expenses and equipment. The Class B Plan also provides
that  PFD  will  receive  all  contingent   deferred  sales  charges   ("CDSCs")
attributable to Class B shares. (See "Distributions Plans" in the Prospectus.)


Class C Plan

The Class C Plan provides that the Fund will pay PFD, as the Fund's  distributor
for its Class C shares,  a  distribution  fee accrued daily and paid  quarterly,
equal on an  annual  basis  to 0.75% of the  Fund's  average  daily  net  assets
attributable  to Class C shares and will pay PFD a service fee equal to 0.25% of
the Fund's average daily net assets  attributable to Class C shares. PFD will in
turn pay to  securities  dealers which enter into a sales  agreement  with PFD a
distribution  fee  and  a  service  fee  at  rates  of up to  0.75%  and  0.25%,
respectively,  of the Fund's  average daily net assets  attributable  to Class C
shares  owned by  investors  for whom that  securities  dealer is the  holder or
dealer of record. The service fee is intended to be in consideration of personal
services and/or account maintenance services rendered by the dealer with respect
to Class C shares.  PFD will advance to dealers the first-year  service fee at a
rate equal to 0.25% of the amount invested.  As compensation  therefor,  PFD may
retain the  service  fee paid by the Fund with  respect  to such  shares for the
first year after  purchase.  Commencing  in the  thirteenth  month  following  a
purchase of Class C shares,  dealers will become eligible for additional service
fees at a rate of up to 0.25% of the amount invested and additional compensation
at a rate of up to 0.75% of the amount  invested  with  respect to such  shares.
Dealers  may from time to time be  required to meet  certain  other  criteria in
order to receive  service fees. PFD or its affiliates are entitled to retain all
service  fees  payable  under the  Class C Plan for which  there is no dealer of
record  or for  which  qualification  standards  have not  been  met as  partial
consideration  for  personal  services  and/or  account   maintenance   services
performed by PFD or its affiliates for shareholder accounts.

The  purpose  of  distribution  payments  to PFD  under  the  Class C Plan is to
compensate PFD for its distribution  services with respect to the Class C shares
of the Fund.  PFD pays  commissions  to dealers as well as  expenses of printing
prospectuses  and reports used for sales purposes,  expenses with respect to the
preparation  and  printing of sales  literature  and other  distribution-related
expenses,   including,   without  limitation,  the  cost  necessary  to  provide
distribution-related   services,  or  personnel,   travel  office  expenses  and
equipment.  The  Class C Plan  also  provides  that PFD will  receive  all CDSCs
attributable to Class C shares. (See "Distributions Plans" in the Prospectus.)

                                      -15-
<PAGE>

General

In accordance  with the terms of the Plans,  PFD provides to the Fund for review
by the Trustees a quarterly  written  report of the amounts  expended  under the
respective  Plan and the purpose for which such  expenditures  were made. In the
Trustees'  quarterly  review of the  Plans,  they will  consider  the  continued
appropriateness  and the  level  of  reimbursement  or  compensation  the  Plans
provide.

No  interested  person of the Fund,  nor any  Trustee  of the Fund who is not an
interested person of the Fund, has any direct or indirect  financial interest in
the  operation  of the Plans  except to the extent  that PFD and  certain of its
employees  may be deemed to have such an  interest  as a result of  receiving  a
portion of the  amounts  expended  under the Plans by the Fund and except to the
extent certain officers may have an interest in PFD's ultimate parent, PGI.

The Plans were adopted by a majority  vote of the Board of  Trustees,  including
all of the Trustees who are not, and were not at the time they voted, interested
persons  of the Fund,  as  defined in the 1940 Act (none of whom had or have any
direct or indirect  financial  interest in the operation of the Plans),  cast in
person at a meeting called for the purpose of voting on the Plans.  In approving
the Plans, the Trustees identified and considered a number of potential benefits
which the Plans may  provide.  The Board of  Trustees  believes  that there is a
reasonable  likelihood  that the Plans will benefit each Fund and their  current
and future shareholders. Under their terms, the Plans remain in effect from year
to year provided such  continuance is approved  annually by vote of the Trustees
in the  manner  described  above.  The  Plans  may not be  amended  to  increase
materially the annual  percentage  limitation of average net assets which may be
spent for the services described therein without approval of the shareholders of
the Fund  affected  thereby,  and material  amendments of the Plans must also be
approved by the Trustees in the manner described above. A Plan may be terminated
at any time,  without  payment of any  penalty,  by vote of the  majority of the
Trustees  who are not  interested  persons  of the Fund and  have no  direct  or
indirect  financial  interest in the  operations  of the Plan, or by a vote of a
majority of the  outstanding  voting  securities of the respective  Class of the
Fund (as defined in the 1940 Act).  A Plan will  automatically  terminate in the
event of its assignment (as defined in the 1940 Act).

During the fiscal year ended September 30, 1995, the Fund incurred  distribution
fees pursuant to the Fund's Class A plan of approximately $1,799,000. No Class B
or Class C shares were outstanding  during this period.  Distribution  fees were
paid by the Fund to PFD in  reimbursement  of expenses  related to  servicing of
shareholder accounts and to compensating dealers and sales personnel.

5. SHAREHOLDER SERVICING/TRANSFER AGENT

The Fund has contracted with PSC, 60 State Street, Boston, Massachusetts, to act
as  shareholder  servicing  and  transfer  agent  for the  Fund.  This  contract
terminates  if assigned and may be  terminated  without  penalty by either party
upon ninety days'  written  notice by vote of its Board of Directors or Trustees
or a majority of its outstanding voting securities.

                                      -16-
<PAGE>

Under  the  terms  of its  contract  with the  Fund,  PSC  services  shareholder
accounts,  and  its  duties  include:  (i)  processing  sales,  redemptions  and
exchanges of shares of the Fund;  (ii)distributing  dividends  and capital gains
associated with Fund portfolio accounts;  and  (iii)maintaining  account records
and responding to shareholder inquiries.

PSC  receives  an annual  fee of $22.00  for each  Class A,  Class B and Class C
shareholder  account from the Fund as  compensation  for the services  described
above.  PSC  is  also  reimbursed  by  the  Fund  for  its  cash   out-of-pocket
expenditures.  The  annual  fee is set at an  amount  determined  by  vote  of a
majority  of the  Trustees  (including  a majority of the  Trustees  who are not
parties to the contract with PSC or  interested  persons of any such parties) to
be  comparable  to  fees  for  such  services  being  paid by  other  investment
companies.

6. CUSTODIAN

Brown Brothers  Harriman & Co. (the  "Custodian") is the custodian of the Fund's
assets. The Custodian's responsibilities include safekeeping and controlling the
Fund's cash and securities, handling the receipt and delivery of securities, and
collecting interest and dividends on the Fund's investments.  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,  including
repurchase  agreements,  issued by the Custodian and may deal with the Custodian
as a principal in securities transactions. Portfolio securities may be deposited
into the Federal Reserve-Treasury Department Book Entry System or the Depository
Trust Company.

7. PRINCIPAL UNDERWRITER

PFD serves as the  principal  underwriter  for the Fund in  connection  with the
continuous  offering  of the  Class A,  Class B and  Class C shares of the Fund.
During the fiscal  years  ended  September  30,  1993,  September  30,  1994 and
September 30, 1995 net  underwriting  commissions paid to PFD in connection with
the  offering  of Class A shares of the Fund were,  respectively,  approximately
$3,535,000,  $2,714,000 and $1,409,000.  Commissions reallowed to dealers during
the same periods were approximately $3,141,000, $2,359,000 and $1,224,000.

The Fund will not generally issue Fund shares for consideration other than cash.
At  the  Fund's  sole  discretion,   however,  it  may  issue  Fund  shares  for
consideration  other than cash in  connection  with a bona fide  reorganization,
statutory  merger,  or other  acquisition  of portfolio  securities  (other than
municipal  debt  securities  issued  by state  political  subdivisions  or their
agencies or  instrumentalities)  provided (i) the securities meet the investment
objectives  and policies of the Fund;  (ii) the  securities  are acquired by the
Fund for investment and not for resale;  (iii) the securities are not restricted
as to transfer either by law or liquidity of market; and (iv)the securities have
a value which is readily  ascertainable  (and not established only by evaluation
procedures)  as evidenced by a listing on the American Stock Exchange or the New
York Stock Exchange or the Nasdaq National Market.

                                      -17-
<PAGE>

8. INDEPENDENT PUBLIC ACCOUNTANTS

Arthur Andersen LLP, One International  Place,  Boston,  Massachusetts 02110, is
the Fund's independent public accountants,  providing audit services, tax return
review,  and  assistance  and  consultation  with respect to the  preparation of
filings with the Commission.

9. PORTFOLIO TRANSACTIONS

All orders for the purchase or sale of portfolio securities are placed on behalf
of the Fund by PMC  pursuant to  authority  contained  in the Fund's  management
contract.  In selecting  brokers or dealers,  PMC will consider various relevant
factors,  including,  but not limited to, the size and type of the  transaction;
the nature and  character  of the markets for the  security to be  purchased  or
sold; the execution efficiency,  settlement capability,  and financial condition
of the dealer;  the dealer's  execution services rendered on a continuing basis;
and the reasonableness of any dealer spreads.

PMC may select  broker-dealers  which provide brokerage and/or research services
to the Fund and/or other investment  companies  managed by PMC. In addition,  if
PMC  determines  in good  faith  that the  amount of  commissions  charged  by a
broker-dealer  is  reasonable  in  relation  to the value of the  brokerage  and
research services provided by such broker,  the Fund may pay commissions to such
broker-dealer in an amount greater than the amount another firm may charge. Such
services may include advice concerning the value of securities; the advisability
of  investing  in,  purchasing  or  selling  securities;   the  availability  of
securities or the purchasers or sellers of securities;  furnishing  analyses and
reports concerning issuers, industries, securities, economic factors and trends,
portfolio  strategy  and  performance  of  accounts;  and  effecting  securities
transactions and performing  functions incidental thereto (such as clearance and
settlement). PMC maintains a listing of broker-dealers who provide such services
on a regular basis. However, because it is anticipated that many transactions on
behalf of the Fund and other investment companies managed by PMC are placed with
broker-dealers  (including  broker-dealers on the listing) without regard to the
furnishing of such  services,  it is not possible to estimate the  proportion of
such  transactions  directed to such dealers  solely  because such services were
provided.

The  research  received  from  broker-dealers  may be useful to PMC in rendering
investment management services to the Fund as well as other investment companies
managed  by PMC,  although  not all such  research  may be  useful  to the Fund.
Conversely,  such  information  provided by brokers or dealers who have executed
transaction  orders on behalf of such other PMC  clients may be useful to PMC in
carrying out its  obligations  to the Fund. The receipt of such research has not
reduced PMC's normal independent research activities; however, it enables PMC to
avoid the additional  expenses  which might  otherwise be incurred if it were to
attempt to develop comparable information through its own staff.

In circumstances  where two or more  broker-dealers  offer comparable prices and
executions,  preference may be given to a broker-dealer which has sold shares of
the Fund as well as shares of other investment  companies or accounts managed by


                                      -18-
<PAGE>

PMC.  This  policy  does  not  imply  a  commitment  to  execute  all  portfolio
transactions through all broker-dealers that sell shares of the Fund.

The Trustees  periodically  review PMC's performance of its  responsibilities in
connection with the placement of portfolio transactions on behalf of the Fund.

In addition to the Fund, PMC acts as investment  adviser to other Pioneer mutual
funds and certain private accounts with investment  objectives  similar to those
of the Fund.  Securities  frequently meet the investment objectives of the Fund,
such other  funds and such  private  accounts.  In such cases,  the  decision to
recommend  a purchase to one fund or account  rather than  another is based on a
number of  factors.  The  determining  factors  in most  cases are the amount of
securities of the issuer then outstanding, the value of those securities and the
market for them.  Other  factors  considered in the  investment  recommendations
include  other  investments  which  each  fund  or  account  presently  has in a
particular  industry and the  availability  of investment  funds in each fund or
account.

It is possible that at times identical  securities will be held by more than one
fund  and/or  account.  However,  positions  in the same  issue may vary and the
length of time that any fund or account may choose to hold its investment in the
same issue may likewise  vary. To the extent that the Fund,  another mutual fund
in the  Pioneer  group or a private  account  managed  by PMC may not be able to
acquire as large a position in such security as it desires, it may have to pay a
higher price for the security.  Similarly, the Fund may not be able to obtain as
large an  execution  of an order to sell or as high a price  for any  particular
portfolio  security if PMC decides to sell on behalf of another account the same
portfolio  security at the same time. On the other hand, if the same  securities
are  bought  or sold at the same  time by more  than one  fund or  account,  the
resulting  participation in volume  transactions could produce better executions
for the Fund or the  account.  In the event more than one account  purchases  or
sells the same  security on a given date,  the purchases and sales will normally
be made as  nearly  as  practicable  on a pro rata  basis in  proportion  to the
amounts desired to be purchased or sold by each.

During the fiscal  years  ended  September  30,  1993,  September  30,  1994 and
September  30,  1995  the  Fund  paid  aggregate   brokerage  and   underwriting
commissions of approximately $1,786,000, $494,000 and $857,000 .

10. TAX STATUS AND DIVIDENDS

It is the Fund's policy to meet the requirements of Subchapter M of the Internal
Revenue Code of 1986, as amended (the "Code"),  for qualification as a regulated
investment  company.  These  requirements  relate to the  sources  of the Fund's
income, the  diversification of its assets, and the timing of its distributions.
If the Fund meets all such  requirements  and distributes to its shareholders at
least  annually all investment  company  taxable income and net capital gain, if
any,  which it  receives,  the Fund will be relieved of the  necessity of paying
federal income tax.

In order to qualify  under  Subchapter  M, the Fund must,  among  other  things,
derive at least 90% of its gross income for each  taxable  year from  dividends,


                                      -19-
<PAGE>

interest,  payments  with respect to  securities  loans,  gains from the sale or
other disposition of stock,  securities or foreign  currencies,  or other income
(including  gains  from  options,  futures or forward  contracts)  derived  with
respect to its  business of investing in such stock,  securities  or  currencies
(the "90% income test"), limit its gains from the sale of stock,  securities and
certain  other  investments  held for less than three months to less than 30% of
its annual gross income (the "30% test") and satisfy certain diversification and
income distribution requirements.

Dividends from investment company taxable income,  which includes net investment
income, net short-term capital gain in excess of net long-term capital loss, and
certain net foreign  exchange  gains are  taxable as  ordinary  income,  whether
received in cash or in additional  shares.  Dividends from net long-term capital
gain in excess of net short-term  capital loss, if any, whether received in cash
or  additional  shares,  are  taxable to the Fund's  shareholders  as  long-term
capital gains for federal  income tax purposes  without  regard to the length of
time  shares of the Fund have been held.  The  federal  income tax status of all
distributions will be reported to shareholders annually.

Any  dividend  declared  by the Fund in  October,  November  or December as of a
record  date in such a month  and paid  during  the  following  January  will be
treated for federal income tax purposes as received by  shareholders on December
31 of the calendar year in which it is declared.

Foreign  exchange  gains and  losses  realized  by the Fund in  connection  with
certain  transactions  involving foreign  currency-denominated  debt securities,
certain  options and futures  contracts  relating to foreign  currency,  forward
foreign  currency  contracts,  foreign  currencies,  or payables or  receivables
denominated in a foreign  currency are subject to Section 988 of the Code, which
generally  causes  such gains and losses to be  treated as  ordinary  income and
losses and may affect the  amount,  timing and  character  of  distributions  to
shareholders.  Any such transactions that are not directly related to the Fund's
investment in stock or  securities  may increase the amount of gain it is deemed
to recognize  from the sale of certain  investments  held for less than 3 months
for purposes of the 30% test, and may under future Treasury  regulations produce
income not among the types of "qualifying income" for purposes of the 90% income
test.  If the net  foreign  exchange  loss for a year were to exceed  the Fund's
investment  company  taxable income  (computed  without regard to such loss) the
resulting  overall  ordinary  loss for such year would not be  deductible by the
Fund or its shareholders in future years.

If the Fund  acquires  stock in certain  non-U.S.  corporations  that receive at
least 75% of their annual gross income from passive  sources  (such as interest,
dividends,  rents,  royalties  or  capital  gain) or hold at least  50% of their
assets in investments producing such passive income ("passive foreign investment
companies"),  the Fund could be subject  to  Federal  income tax and  additional
interest charges on "excess distributions"  received from such companies or gain
from the sale of stock in such  companies,  even if all income or gain  actually
received by the Fund is timely  distributed to its shareholders.  The Fund would
not be able to pass through to its shareholders any credit or deduction for such
a tax.  Certain  elections  may,  if  available,  ameliorate  these  adverse tax
consequences  but any such election would require the Fund to recognize  taxable
income or gain without the concurrent receipt of cash. The Fund may limit and/or


                                      -20-
<PAGE>

manage its holdings in passive foreign investment  companies to minimize its tax
liability or maximize its return from these investments.

At the time of an investor's  purchase of Fund shares, a portion of the purchase
price is often attributable to realized or unrealized appreciation in the Fund's
portfolio or undistributed taxable income of the Fund. Consequently,  subsequent
distributions  from such  appreciation or income may be taxable to such investor
even if the net  asset  value of the  investor's  shares  is, as a result of the
distributions,  reduced  below  the  investor's  cost  for such  shares  and the
distributions in reality represent a return of a portion of the investment.

Any loss realized upon the redemption of shares with a tax holding period of six
months or less will be treated as a long-term  capital loss to the extent of any
amounts treated as distributions of long-term  capital gain with respect to such
shares.

In addition,  if Class A shares  redeemed or  exchanged  have been held for less
than 91 days,  (1)in the case of a  reinvestment  at net asset value,  the sales
charge paid on such shares is not included in their tax basis under the Code and
(2)in the case of an exchange, all or a portion of the sales charge paid on such
shares is not included in their tax basis under the Code,  to the extent a sales
charge that would  otherwise  apply to the shares received is educed pursuant to
the  exchange  privilege.  In either  case,  the portion of the sales charge not
included in the tax basis of the shares  redeemed or  surrendered in an exchange
is  included  in the tax basis of the shares  acquired  in the  reinvestment  or
exchange.  Losses on certain  redemptions  may be  disallowed  under "wash sale"
rules in the event of other  investments  in the same Fund within a period of 61
days  beginning  30 days before and ending 30 days after a  redemption  or other
sale of shares.

For federal  income tax  purposes,  the Fund is permitted to carry forward a net
capital loss in any year to offset net capital gains,  if any,  during the eight
years following the year of the loss. To the extent subsequent net capital gains
are offset by such losses, they would not result in federal income tax liability
to such Fund and are not expected to be distributed as such to shareholders.

Options written or purchased and futures  contracts  entered into by the Fund on
certain  securities,  securities  indices  and  foreign  currencies,  as well as
certain  foreign  currency  forward  contracts,  may cause the Fund to recognize
gains or  losses  from  marking-to-market  at the end of its  taxable  year even
though such options may not have  lapsed,  been closed out, or exercised or such
futures or forward contracts may not have been closed out or disposed of and may
affect the characterization as long-term or short-term of some capital gains and
losses realized by the Fund.  Certain options,  futures and forward contracts on
foreign currency may be subject to Section 988, described above, and accordingly
produce ordinary income or loss.  Losses on certain options,  futures or forward
contracts and/or offsetting positions  (portfolio  securities or other positions
with respect to which the Fund's risk of loss is substantially diminished by one
or more options,  futures or forward  contracts)  may also be deferred under the
tax straddle rules of the Code,  which may also affect the  characterization  of
capital gains or losses from straddle positions and certain successor  positions
as  long-term  or  short-term.  The tax rules  applicable  to options,  futures,
forward  contracts and straddles may affect the amount,  timing and character of
the  Fund's  income  and loss and hence of its  distributions  to  shareholders.


                                      -21-
<PAGE>

Certain tax elections may be available  that would enable the Fund to ameliorate
some adverse effects of the tax rules described in this paragraph.

For purposes of the 70% dividends-received  deduction available to corporations,
dividends  received by the Fund,  if any,  from U.S.  domestic  corporations  in
respect of any share of stock with a tax holding  period of at least 46 days (91
days in the case of certain preferred stock) held in an unleveraged position and
distributed  and designated by the Fund may be treated as qualifying  dividends.
Any  corporate   shareholder  should  consult  its  tax  adviser  regarding  the
possibility that its tax basis in its shares may be reduced,  for federal income
tax purposes,  by reason of "extraordinary  dividends"  received with respect to
the  shares.  Corporate  shareholders  must  meet  the  minimum  holding  period
requirement stated above (46 or 91 days), taking into account any holding-period
reductions  from certain  hedging or other  transactions  that  diminish risk of
loss,  with  respect to their Fund shares in order to qualify for the  deduction
and,  if they  borrow to  acquire  Fund  shares,  may be denied a portion of the
dividends-received  deduction.  The entire  qualifying  dividend,  including the
otherwise deductible amount, will be included in determining the excess (if any)
of a  corporation's  adjusted  current  earnings  over its  alternative  minimum
taxable  income,  which may  increase a  corporation's  alternative  minimum tax
liability.

The Fund may be  subject  to  withholding  and other  taxes  imposed  by foreign
countries  with  respect to  investments  in those  countries.  Tax  conventions
between certain  countries and the U.S. may reduce or eliminate such taxes.  The
Fund does not  expect  to  satisfy  the  requirements  for  passing  through  to
shareholders  their pro rata shares of foreign taxes paid by the Fund,  with the
result that its shareholders  will not include such taxes in their gross incomes
and will not be  entitled to a tax  deduction  or credit for such taxes on their
own tax returns

Different tax treatment, including penalties on certain excess contributions and
deferrals, certain pre-retirement and post-retirement distributions, and certain
prohibited   transactions  is  accorded  to  accounts  maintained  as  qualified
retirement  plans.  Shareholders  should  consult  their tax  advisers  for more
information.

The Fund is not subject to Massachusetts  corporation  franchise or excise taxes
and,  provided  that it qualifies as a regulated  investment  company  under the
Code, also will not be required to pay any Massachusetts income tax.


Federal law requires  that the Fund  withhold (as "backup  withholding")  31% of
reportable  payments,  including  dividends,  capital  gain  dividends,  and the
proceeds of redemptions  (including exchanges) and repurchases,  to shareholders
who have not complied with Internal  Revenue  Service  ("IRS")  regulations.  In
order to avoid this withholding requirement,  shareholders must certify on their
Account  Applications,  or on separate W-9 Forms,  that their Social Security or
other Taxpayer  Identification Number is correct and that they are not currently
subject to backup withholding,  or that they are exempt from backup withholding.
The Fund may nevertheless be required to withhold if it receives notice from the
IRS or a broker that the number  provided is incorrect or backup  withholding is
applicable  as a result of  previous  underreporting  of  interest  or  dividend
income.


                                      -22-
<PAGE>

The description  above relates only to U.S.  federal income tax consequences for
shareholders  who are U.S.  persons,  i.e., U.S.  citizens or residents and U.S.
domestic corporations,  partnerships,  trusts or estates, and who are subject to
U.S.  federal income tax. The description does not address the special tax rules
applicable to particular types of investors, such as banks, insurance companies,
or tax-exempt  entities.  Shareholders  should consult their own tax advisers on
these matters and on state, local and other applicable tax laws. Investors other
than U.S.  persons may be subject to different U.S. tax  treatment,  including a
possible 30% U.S. withholding tax (or withholding tax at a lower treaty rate) on
amounts treated as ordinary dividends from the Fund and, unless an effective IRS
Form W-8 or  authorized  substitute  is on file,  to 31% backup  withholding  on
certain other payments from the Fund.

11. DESCRIPTION OF SHARES

The Fund's  Declaration  of Trust permits the Board of Trustees to authorize the
issuance of an  unlimited  number of full and  fractional  shares of  beneficial
interest  which may be divided  into such  separate  series as the  Trustees may
establish.  Currently,  the Fund consists of only one series.  The Trustees may,
however,  establish additional series of shares in the future, and may divide or
combine the shares  into a greater or lesser  number of shares  without  thereby
changing the proportionate  beneficial interests in the Fund. The Declaration of
Trust further  authorizes  the Trustees to classify or reclassify  any series of
the  shares  into one or more  classes.  Pursuant  thereto,  the  Trustees  have
authorized  the issuance of three  classes of shares of the Fund,  designated as
Class A shares,  Class B and Class C shares.  Each  share of a class of the Fund
represents an equal  proportionate  interest in the assets of the Fund allocable
to that class.  Upon liquidation of the Fund,  shareholders of each class of the
Fund are  entitled to share pro rata in the Fund's net assets  allocable to such
class available for distribution to shareholders. The Fund reserves the right to
create and issue  additional  series or  classes  of  shares,  in which case the
shares of each class of a series  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  a  meeting  of
shareholders.  Although  Trustees are not elected annually by the  shareholders,
shareholders have, under certain circumstances,  the right to remove one or more
Trustees.

The shares of each series of the Fund are entitled to vote separately to approve
investment  advisory  agreements  or changes  in  investment  restrictions,  but
shareholders  of all series  vote  together in the  election  and  selection  of
Trustees and  accountants.  Shares of all series of the Fund vote  together as a
class on matters  that affect all series of the Fund in  substantially  the same
manner. As to matters affecting a single series or class,  shares of such series
or class will vote separately.  No amendment  adversely  affecting the rights of
shareholders  may be  made  to the  Fund's  Declaration  of  Trust  without  the
affirmative  vote of a majority of its  shares.  Shares  have no  preemptive  or
conversion rights.  Shares are fully paid and non-assessable by the Fund, except
as stated below.



                                      -23-
<PAGE>

12. CERTAIN LIABILITIES

The  Fund  (previously  named  Pioneer  Three)  was  previously  organized  as a
Massachusetts business trust and was reorganized as a Delaware business trust on
January 31, 1996,  pursuant to an Agreement and Plan of Reorganization  approved
by the  shareholders  of the Fund.  As a  Delaware  business  trust,  the Fund's
operations  are governed by its  Declaration  of Trust dated January 31, 1996. A
copy of the fund's Certificate of Trust, also dated January 31, 1996, is on file
with the  office of the  Secretary  of State of  Delaware.  Generally,  Delaware
business trust  shareholders  are not personally  liable for  obligations of the
Delaware business trust under Delaware law. The Delaware Business Trust Act (the
"Delaware  Act") provides that a shareholder of a Delaware  business trust shall
be entitled to the same  limitation  of liability  extended to  shareholders  of
private  for-profit  corporations.  The Fund's  Declaration  of Trust  expressly
provides  that  the  Fund is  organized  under  the  Delaware  Act and  that the
Declaration  of Trust is to be  governed by  Delaware  law.  It is  nevertheless
possible that a Delaware  business trust, such as the fund, might become a party
to an action in another  state whose courts  refused to apply  Delaware  law, in
which case the trust's shareholders could become subject to personal liability.

To guard  against this risk,  the  Declaration  of Trust (I) contains an express
disclaimer  of  shareholder  liability for acts or  obligations  of the Fund and
provides  that  notice  of such  disclaimer  may be  given  in  each  agreement,
obligation or  instrument  entered into or executed by the Fund or its Trustees,
(ii) provides for the  indemnification  out of Fund property of any shareholders
held personally liable for any obligations of the Fund or any series of the Fund
and (iii) provides that the Fund shall, upon request,  assume the defense of any
claim made against any  shareholder  for any act or  obligation  of the Fund and
satisfy  any  judgment  thereon.  Thus,  the  risk  of a  shareholder  incurring
financial loss beyond his or her investment because of shareholder  liability is
limited to circumstances in which all of the following factors are present:  (1)
a court refused to apply  Delaware  law; (2) the liability  arose under tort law
or, if not, no  contractual  limitation of liability was in effect;  and (3) the
Fund itself would be unable to meet its  obligations.  In light of Delaware law,
the nature of the Fund's  business  and the  nature of its  assets,  the risk of
personal liability to a Fund shareholder is remote.

The Declaration of Trust further  provides that the Fund shall indemnify each of
its Trustees and officers against  liabilities and expenses  reasonably incurred
by them, in connection with, or arising out of, any action,  suit or proceeding,
threatened against or otherwise  involving such Trustee or officer,  directly or
indirectly,  by reason of being or having been a Trustee or officer of the Fund.
The Declaration of Trust does not authorize the Fund to indemnify any Trustee or
officer  against any liability to which he or she would  otherwise be subject by
reason of or for willful  misfeasance,  bad faith,  gross negligence or reckless
disregard of such person's duties.

13.  LETTER OF INTENTION

Purchases  in the Class A shares of the Fund of $50,000 or more  (excluding  any
reinvestments  of  dividends  and  capital  gains  distributions)  made within a
13-month period  pursuant to a Letter of Intention  provided by PFD will qualify


                                      -24-
<PAGE>

for a reduced  sales  charge.  Such reduced sales charge will be the charge that
would be applicable to the purchase of all Class A shares  purchased during such
13-month period pursuant to a Letter of Intention had such shares been purchased
all at once.  See "How to Buy Fund Shares" in each  Prospectus.  For example,  a
person who signs a Letter of Intention providing for a total investment in Class
A shares of $50,000  over a 13-month  period would be charged at the 4.50% sales
charge rate with respect to all purchases during that period.  Should the amount
actually  purchased  during  the  13-month  period  be more or  less  than  that
indicated  in the Letter,  an  adjustment  in the sales  charge will be made.  A
purchase not made pursuant to a Letter of Intention  may be included  thereafter
if the Letter is filed within 90 days of such purchase. Any shareholder may also
obtain the reduced  sales  charge by  including  the value (at current  offering
price) of all the shares of record he holds in the Fund and in all other Pioneer
mutual  funds as of the  date of the  Letter  of  Intention  as a credit  toward
determining  the  applicable  scale of sales charge for the Class A shares to be
purchased under the Letter of Intention.

The  Letter  of  Intention  authorizes  PSC to  escrow  Class A shares  having a
purchase price equal to 5% of the stated  investment  specified in the Letter of
Intention.  A Letter of Intention is not a binding  obligation upon the investor
to purchase,  or the Fund to sell,  the full amount  indicated  and the investor
should carefully read the provisions of the Letter of Intention set forth in the
Account Application before signing.

14. SYSTEMATIC WITHDRAWAL PLAN

The  Systematic  Withdrawal  Plan  ("SWP") is designed  to provide a  convenient
method of receiving  fixed payments at regular  intervals from Class A shares of
the Fund  deposited by the applicant  under this SWP. The applicant must deposit
or purchase  for deposit with PSC shares of the Fund having a total value of not
less than $10,000.  Periodic checks of $50 or more will be deposited  monthly or
quarterly  directly  into a bank account  designated by the applicant or will be
sent by check to the  applicant,  or any  person  designated  by him  monthly or
quarterly.  Withdrawals  from Class B share  accounts  are limited to 10% of the
value of the account at the time the SWP is implemented.

Any income dividends or capital gains distributions on shares under the SWP will
be  credited  to the Plan  account on the  payment  date in full and  fractional
shares at the net asset value per share in effect on the record date.

SWP payments are made from the proceeds of the  redemption  of shares  deposited
under the SWP in a SWP account. To the extent that such redemptions for periodic
withdrawals  exceed  dividend  income  reinvested  in  the  SWP  account,   such
redemptions  will  reduce  and may  ultimately  exhaust  the  number  of  shares
deposited  in  the  Plan  account.   Redemptions  are  taxable  transactions  to
shareholders.  In  addition,  the amounts  received by a  shareholder  cannot be
considered  as yield or income  on his or her  investment  because  part of such
payments may be a return of his or her investment.

                                      -25-
<PAGE>

The SWP may be terminated at any time (1)by written notice to PSC or from PSC to
the  shareholder;  (2)upon  receipt  by  PSC  of  appropriate  evidence  of  the
shareholder's death; or (3)when all shares under the Plan have been redeemed.

15.  DETERMINATION OF NET ASSET VALUE

The net asset value per share of each class of the Fund is  determined as of the
close  of  regular  trading  on the New York  Stock  Exchange  (the  "Exchange")
(currently  4:00 p.m.,  Eastern  Time) on each day on 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:
New Year's Day,  Presidents' Day, Good Friday,  Memorial Day,  Independence Day,
Labor Day,  Thanksgiving Day and Christmas Day. The net asset value per share of
each class of the Fund is also determined on any other day in which the level of
trading in its portfolio  securities is  sufficiently  high that the current net
asset  value per share might be  materially  affected by changes in the value of
its  portfolio  securities.  The Fund is not required to determine its net asset
value per share on any day in which no  purchase  orders  for the  shares of the
Fund become effective and no shares are tendered for redemption.

The net asset  value per share of each class of the Fund is  computed  by taking
the value of all of the Fund's assets  attributable to a class,  less the Fund's
liabilities  attributable  to  a  class,  and  dividing  it  by  the  number  of
outstanding  shares of the class.  For purposes of determining  net asset value,
expenses of the classes of the Fund are accrued daily.

Securities that have not traded on the date of valuation or securities for which
sales prices are not generally  reported are valued at the mean between the last
bid and asked  prices.  Securities  for which no market  quotations  are readily
available  (excluding  those whose trading has been suspended) will be valued at
fair value as  determined  in good faith by the Board of Trustees,  although the
actual  computations  may be made by persons acting pursuant to the direction of
the Board of Trustees.

The Fund's maximum  offering price per Class A share is determined by adding the
maximum sales charge to the net asset value per Class A share. Class B and Class
C shares are offered at net asset value  without  the  imposition  of an initial
sales charge.

                                      -26-
<PAGE>

16. INVESTMENT RESULTS

Quotations, Comparisons, and General Information

From time to time,  in  advertisements,  in sales  literature,  or in reports to
shareholders,  the  past  performance  of the  Fund  may be  illustrated  and/or
compared with that of other mutual funds with similar investment objectives, and
to stock or other  relevant  indices.  For  example,  total return of the Fund's
classes  may be compared to  rankings  prepared by Lipper  Analytical  Services,
Inc.,  a widely  recognized  independent  service  which  monitors  mutual  fund
performance;  the  Standard  & Poors  Mid-Cap  400 Index  (described  above);the
Standard & Poor's 500 Stock Index ("S&P 500"),  an index of unmanaged  groups of
common stock; the Dow Jones Industrial Average, a recognized  unmanaged index of
common stocks of 30 industrial  companies listed on the New York Stock Exchange;
or The Frank Russell Indexes  ("Russell  1000," "2000," "2500,"  "3000,") or the
Wilshire Total Market Value Index ("Wilshire  5000"),  two recognized  unmanaged
indexes of broad based common stocks.

In  addition,  the  performance  of the  classes of the Fund may be  compared to
alternative  investment or savings  vehicles  and/or to indexes or indicators of
economic activity,  e.g., inflation or interest rates.  Performance rankings and
listings reported in newspapers or national business and financial publications,
such as Barron's,  Business Week, Consumers Digest, Consumer Reports,  Financial
World, Forbes, Fortune,  Investors Business Daily,  Kiplinger's Personal Finance
Magazine,  Money Magazine, New York Times, Smart Money, USA Today, U.S. News and
World Report, The Wall Street Journal,  and Worth may also be cited (if the Fund
is  listed  in any  such  publication)  or  used  for  comparison,  as  well  as
performance listings and rankings from various other sources including Bloomberg
Financial Markets, CDA/Wiesenberger,  Donoghue's Mutual Fund Almanac, Investment
Company  Data,  Inc.,  Johnson's  Charts,  Kanon  Bloch  Carre  and Co.,  Lipper
Analytical  Services,  Inc.,  Micropal,  Inc.,  Morningstar,   Inc.,  Schabacker
Investment Management and Towers Data Systems, Inc.

In  addition,  from  time  to  time  quotations  from  articles  from  financial
publications  such as those listed above may be used in  advertisements in sales
literature, or in reports to shareholders of the Fund.

The Fund may also present, from time to time,  historical  information depicting
the value of a  hypothetical  account  in one or more  classes of the Fund since
such Fund's inception.

In  presenting  investment  results,  the Fund may also  include  references  to
certain  financial  planning  concepts,  including  (a) an  investor's  need  to
evaluate his financial  assets and  obligations to determine how much to invest;
(b) his need to analyze the objectives of various investments to determine where
to invest;  and (c) his need to analyze his time frame for future  capital needs
to determine how long to invest. The investor controls these three factors,  all
of which affect the use of investments in building assets.

One of the primary  methods  used to measure the  performance  of a class of the
Fund is "total  return."  "Total return" will normally  represent the percentage


                                      -27-
<PAGE>

change in value of an account, or of a hypothetical investment in a class of the
Fund, over any period up to the lifetime of that class of the Fund. Total return
calculations  will usually assume the  reinvestment of all dividends and capital
gains  distributions and will be expressed as a percentage  increase or decrease
from an  initial  value,  for the  entire  period  or for one or more  specified
periods within the entire period.  Total return  percentages for periods of less
than one year will usually be annualized;  total return  percentages for periods
longer than one year will usually be accompanied by total return percentages for
each year within the period and/or by the average annual compounded total return
for the  period.  The income and  capital  components  of a given  return may be
separated  and  portrayed  in a  variety  of ways in order to  illustrate  their
relative  significance.  Performance  may also be  portrayed in terms of cash or
investment values,  without  percentages.  Past performance cannot guarantee any
particular future result.

The Fund's  average  annual total return  quotations  for each of its classes as
that  information  may  appear  in the  Fund's  Prospectus,  this  Statement  of
Additional  Information  or in advertising  are  calculated by standard  methods
prescribed by the Commission.

Standardized Average Annual Total Return Quotations

Average  annual total return  quotations for Class A, Class B and Class C shares
are computed by finding the average annual compounded rates of return that would
cause  a  hypothetical  investment  in the  class  made  on the  first  day of a
designated  period (assuming all dividends and  distributions are reinvested) to
equal the ending  redeemable value of such  hypothetical  investment on the last
day of the designated period in accordance with the following formula:

                            P(1+T)n = ERV

Where:            P        =   a hypothetical  initial  payment of $1,000,  less
                               the  maximum  sales  load of  $57.50  for Class A
                               shares or the  deduction  of the CDSC for Class B
                               and Class C shares at the end of the period.

                  T        =   average annual total return

                  n        =   number of years

                  ERV      =   ending redeemable value of the hypothetical $1000
                               initial  payment  made  at the  beginning  of the
                               designated period (or fractional portion thereof)

For  purposes of the above  computation,  it is assumed that all  dividends  and
distributions  made by the Fund are  reinvested  at net asset  value  during the
designated  period.  The average annual total return  quotation is determined to
the nearest 1/100 of 1%.

                                      -28-
<PAGE>

In determining the average annual total return  (calculated as provided  above),
recurring  fees,  if any,  that are  charged to all  shareholder  accounts  of a
particular  class are taken into  consideration.  For any account fees that vary
with the size of the  account,  the account  fee used for  purposes of the above
computation  is assumed  to be the fee that  would be charged to a class's  mean
account size.

Automated Information Line


FactFoneSM, Pioneer's 24-hour automated information line, allows shareholders to
dial toll-free 1-800-225-4321 and hear recorded fund information, including:


         o   net asset value prices for all Pioneer mutual funds;

         o   annualized 30-day yields on Pioneer's fixed income funds;

         o   annualized 7-day yields and 7-day effective (compound) yields for 
             Pioneer's money market funds; and

         o   dividends and capital gains distributions on all Pioneer mutual 
             funds.

Yields are calculated in accordance with Commission mandated standard formulas.


In addition, by using a personal identification number ("PIN"), shareholders may
enter  purchases,  exchanges and  redemptions,  access their account balance and
last three transactions and may order a duplicate statement. See "FactFoneSM" in
the Prospectus for more information.

All  performance  numbers   communicated   through  FactFoneSM   represent  past
performance,  and  figures  for  all  quoted  bond  funds  include  the  maximum
applicable sales charge. A shareholder's actual yield and total return will vary
with  changing  market  conditions.  The  value of Class A,  Class B and Class C
shares  (except for Pioneer money market funds,  which seek a stable $1.00 share
price) will also vary,  and such shares may be worth more or less at  redemption
than their original cost.


17.  FINANCIAL STATEMENTS


The Fund's financial statements for the fiscal year ended September 30, 1995 and
the Report of  Independent  Public  Accountants  included in this  Statement  of
Additional  Information have been included in reliance upon the report of Arthur
Andersen,  LLP,  independent  public  accountants,  as experts in accounting and
auditing.  The  report  of  Independent  Accountants  and  financial  statements
included in the Fund's  Annual  Report for the fiscal year ended  September  30,
1995, filed  electronically  on November 29, 1995, are incorporated by reference
into this Statement of Additional Information. The financial highlights table in
the Prospectus and the financial  statements  incorporated by reference into the
Prospectus and Statement of Additional Information have been so included and


                                      -29-
<PAGE>

incorporated in reliance upon the report of Arthur  Andersen,  LLP,  independent
public  accountants,  given on their  authority  as  experts in  accounting  and
auditing.




















                                      -30-
<PAGE>



                                   APPENDIX A



                          Description of Bond Ratings1

                        Moody's Investor's Service, Inc.2

Aaa: Bonds which are rated Aaa are judged to be of the best quality.  They carry
the smallest  degree of investment  risk and are generally  referred to as "gilt
edge." Interest payments are protected by a large or by an exceptionally  stable
margin and principal is secure. While the various protective elements are likely
to change,  such changes as can be  visualized  are most  unlikely to impair the
fundamentally strong position of such issues.

Aa: Bonds which are rated Aa are judged to be of high quality by all  standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds.  They are rated lower than the best bonds  because  margins of protection
may not be as large as in Aaa securities or  fluctuation of protective  elements
may be of greater  amplitude or there may be other  elements  present which make
the long-term risks appear somewhat bigger than in Aaa securities.

A: Bonds which are rated A possess many favorable investment  attributes and are
to be considered as upper medium grade  obligations.  Factors giving security to
principal and interest are considered adequate but elements may be present which
suggest susceptibility to impairment sometime in the future.

Baa: Bonds which are rated Baa are considered as medium grade obligations, i.e.,
they are neither  highly  protected nor poorly  secured.  Interest  payments and
principal  security  appear  adequate  for the present  but  certain  protective
elements may be lacking or may be  characteristically  unreliable over any great
length of time. Such bonds lack outstanding  investment  characteristics  and in
fact have speculative characteristics as well.

- ---------------------------------------------
1 The  ratings  indicated  herein are  believed  to be the most  recent  ratings
available at the date of this Prospectus for the securities listed.  Ratings are
generally given to securities at the time of issuance. While the rating agencies
may from time to time revise such  ratings,  they  undertake no obligation to do
so, and the ratings indicated do not necessarily represent ratings which will be
given to these securities on the date of the Fund's fiscal year-end.

2 Rates bonds of issuers  which have  $600,000 or more of debt,  except bonds of
educational  institutions,  projects  under  construction,  enterprises  without
established  earnings  records and  situations  where current  financial data is
unavailable.



                                      -31-
<PAGE>


                        Standard & Poor's Ratings Group 3

AAA:  Bonds rated AAA are highest grade  obligations.  This rating  indicates an
extremely strong capacity to pay principal and interest.

AA: Bonds rated AA also  qualify as  high-quality  obligations.  Capacity to pay
principal  and  interest is very strong,  and in the majority of instances  they
differ from AAA issues only in small degree.

A: Bonds rated A have a strong capacity to pay principal and interest,  although
they are more susceptible to the adverse effects of changes in circumstances and
economic conditions.

BBB:  Bonds  rated  BBB are  regarded  as  having an  adequate  capacity  to pay
principal  and  interest.  Whereas they  normally  exhibit  adequate  protection
parameters,  adverse  economic  conditions  or changing  circumstances  are more
likely to lead to a weakened capacity to pay principal and interest for bonds in
this category than for bonds in the A category.

- -------------------------------------------------
3 Rates all governmental  bodies having  $1,000,000 or more of debt outstanding,
unless adequate information is not available.


                                      -32-
<PAGE>


S&P Mid-Cap 400
This index is a readily available, carefully constructed,  market value weighted
benchmark of common stock performance.  Currently,  the S&P Mid-Cap 400 includes
400  domestic  stocks  chosen for market  size,  liquidity  and  industry  group
representation.  It is a market weighted  average and was the first benchmark of
mid-cap stock price movements.

S&P 500
This index is a readily available, carefully constructed,  market value weighted
benchmark  of common  stock  performance.  Currently,  the S&P  Composite  Index
includes  500 of the  largest  stocks  (in terms of stock  market  value) in the
United States; prior to March 1957 it consisted of 90 of the largest stocks.

DOW JONES INDUSTRIAL AVERAGE
This is a total return index based on the performance of 30 blue chip stocks.

SMALL CAPITALIZATION STOCKS
This index is a market value  weighted  index of the ninth and tenth  deciles of
the New York Stock  Exchange  (NYSE),  plus stocks listed on the American  Stock
Exchange (AMEX) and over-the-counter  (OTC) with the same or less capitalization
as the upper bound of the NYSE ninth decile.

INFLATION
The  Consumer  Price  Index  for All Urban  Consumers  (CPI-U),  not  seasonally
adjusted, is used to measure inflation,  which is the rate of change of consumer
goods prices.  Unfortunately,  the  inflation  rate as derived by the CPI is not
measured  over the same period as the other asset  returns.  All of the security
returns are measured  from one  month-end to the next  month-end.  CPI commodity
prices are collected during the month.  Thus,  measured  inflation rates lag the
other  series  by about  one-half  month.  Prior to  January  1978,  the CPI (as
compared with CPI-U) was used.  Both inflation  measures are  constructed by the
U.S. Department of Labor, Bureau of Labor Statistics, Washington, DC.

S&P/BARRA INDEXES
"The S&P/BARRA  Growth and Value Indexes are  constructed by dividing the stocks
in the S&P 500  Index  according  to  price-to-book  ratios.  The  Growth  Index
contains stocks with higher  price-to-book  ratios, and the Value Index contains
stocks with lower price-to-book  ratios. Both indexes are market  capitalization
weighted."


Source:   Ibbotson Associates


                                      -33-
<PAGE>


NEED TO REVIEW THIS INFORMATION AS APPLICABLE TO MID-CAP FUND
<TABLE>
<CAPTION>


                                        Dow Jones        U.S. Small                         S&P/BARRA         S&P/BARRA
                       S&P500           Ind'l Avg       Stock Index     U.S. Inflation        Growth            Value
                         %TR               %TR               %TR              %TR               %TR              %TR

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

<S>                     <C>               <C>              <C>                <C>              <C>               <C>      
Dec 1928                43.61             55.38            39.69             -0.97             N/A               N/A
Dec 1929                -8.42            -13.64            -51.36            0.20              N/A               N/A
Dec 1930               -24.90            -30.22            -38.15            -6.03             N/A               N/A
Dec 1931               -43.34            -49.03            -49.75            -9.52             N/A               N/A
Dec 1932                -8.19            -16.88            -5.39            -10.30             N/A               N/A
Dec 1933                53.99             73.71            142.87            0.51              N/A               N/A
Dec 1934                -1.44             8.07             24.22             2.03              N/A               N/A
Dec 1935                47.67             43.77            40.19             2.99              N/A               N/A
Dec 1936                33.92             30.23            64.80             1.21              N/A               N/A
Dec 1937               -35.03            -28.88            -58.01            3.10              N/A               N/A
Dec 1938                31.12             33.16            32.80             -2.78             N/A               N/A
Dec 1939                -0.41             1.31              0.35             -0.48             N/A               N/A
Dec 1940                -9.78             -7.96            -5.16             0.96              N/A               N/A
Dec 1941               -11.59             -9.88            -9.00             9.72              N/A               N/A
Dec 1942                20.34             14.12            44.51             9.29              N/A               N/A
Dec 1943                25.90             19.06            88.37             3.16              N/A               N/A
Dec 1944                19.75             17.19            53.72             2.11              N/A               N/A
Dec 1945                36.44             31.60            73.61             2.25              N/A               N/A
Dec 1946                -8.07             -4.40            -11.63            18.16             N/A               N/A
Dec 1947                5.71              7.61              0.92             9.01              N/A               N/A
Dec 1948                5.50              4.27             -2.11             2.71              N/A               N/A
Dec 1949                18.79             20.92            19.75             -1.80             N/A               N/A
Dec 1950                31.71             26.40            38.75             5.79              N/A               N/A
Dec 1951                24.02             21.77             7.80             5.87              N/A               N/A
Dec 1952                18.37             14.58             3.03             0.88              N/A               N/A
Dec 1953                -0.99             2.02             -6.49             0.62              N/A               N/A
Dec 1954                52.62             51.25            60.58             -0.50             N/A               N/A
Dec 1955                31.56             26.58            20.44             0.37              N/A               N/A
Dec 1956                6.56              7.10              4.28             2.86              N/A               N/A
Dec 1957               -10.78             -8.63            -14.57            3.02              N/A               N/A
Dec 1958                43.36             39.31            64.89             1.76              N/A               N/A
Dec 1959                11.96             20.21            16.40             1.50              N/A               N/A
Dec 1960                0.47              -6.14            -3.29             1.48              N/A               N/A
Dec 1961                26.89             22.60            32.09             0.67              N/A               N/A
Dec 1962                -8.73             -7.43            -11.90            1.22              N/A               N/A
Dec 1963                22.80             20.83            23.57             1.65              N/A               N/A
Dec 1964                16.48             18.85            23.52             1.19              N/A               N/A
Dec 1965                12.45             14.39            41.75             1.92              N/A               N/A
Dec 1966               -10.06            -15.78            -7.01             3.35              N/A               N/A
Dec 1967                23.98             19.16            83.57             3.04              N/A               N/A



                                      -34-
<PAGE>

                                        Dow Jones        U.S. Small                         S&P/BARRA         S&P/BARRA
                       S&P500           Ind'l Avg       Stock Index     U.S. Inflation        Growth            Value
                         %TR               %TR               %TR              %TR               %TR              %TR

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

Dec 1968                11.06             7.93             35.97             4.72              N/A               N/A
Dec 1969                -8.50            -11.78            -25.05            6.11              N/A               N/A
Dec 1970                4.01              9.21             -17.43            5.49              N/A               N/A
Dec 1971                14.31             9.83             16.50             3.36              N/A               N/A
Dec 1972                18.98             18.48             4.43             3.41              N/A               N/A
Dec 1973               -14.66            -13.28            -30.90            8.80              N/A               N/A
Dec 1974               -26.47            -23.58            -19.95            12.20             N/A               N/A
Dec 1975                37.20             44.75            52.82             7.01             31.72             43.38
Dec 1976                23.84             22.82            57.38             4.81             13.84             34.93
Dec 1977                -7.18            -12.84            25.38             6.77             -11.82            -2.57
Dec 1978                6.56              2.79             23.46             9.03              6.78             6.16
Dec 1979                18.44             10.55            43.46             13.31            15.72             21.16
Dec 1980                32.42             22.17            39.88             12.40            39.40             23.59
Dec 1981                -4.91             -3.57            13.88             8.94             -9.81             0.02
Dec 1982                21.41             27.11            28.01             3.87             22.03             21.04
Dec 1983                22.51             25.97            39.67             3.80             16.24             28.89
Dec 1984                6.27              1.31             -6.67             3.95              2.33             10.52
Dec 1985                32.16             33.55            24.66             3.77             33.31             29.68
Dec 1986                18.47             27.10             6.85             1.13             14.50             21.67
Dec 1987                5.23              5.48             -9.30             4.41              6.50             3.68
Dec 1988                16.81             16.14            22.87             4.42             11.95             21.67
Dec 1989                31.49             32.19            10.18             4.65             36.40             26.13
Dec 1990                -3.17             -0.56            -21.56            6.11              0.20             -6.85
Dec 1991                30.55             24.19            44.63             3.06             38.37             22.56
Dec 1992                7.67              7.41             23.35             2.90              5.07             10.53
Dec 1993                9.99              16.94            20.98             2.75              1.68             18.60
Dec 1994                1.31              5.06              3.11             2.78              3.13             -0.64
</TABLE>


Source: Ibbotson Associates



                                      -35-
<PAGE>


                                   APPENDIX B

                            OTHER PIONEER INFORMATION


The Pioneer family of mutual funds was  established in 1928 with the creation of
Pioneer Fund. Pioneer is one of the oldest,  most respected and successful money
managers in the United States.

As of December 31, 1994,  PMC employed a  professional  investment  staff of 46,
with a  combined  average  of 14 years'  experience  in the  financial  services
industry.

At December 31, 1994, there were 591,192 non-retirement shareholder accounts and
337,577 retirement shareholder accounts in Pioneer's funds. Total assets for all
Pioneer funds as of December 31, 1994 were $10,038,000,000  representing a total
of 928,769 shareholder accounts.


    
                                    FORM N-1A

                            PART C. OTHER INFORMATION


Item 24.  Financial Statements and Exhibits

      (a)          Financial Statements:

   
                     The  financial  statements  of  the  Registrant  have  been
                     incorporated by reference into Parts A (in part) and B from
                     the 1995 Annual Report to Shareholders  dated September 30,
                     1995.
    

      (b)          Exhibits:

                     1. Declaration of Trust*

                     2. By-Laws*

                     3. None

                     4. Specimen Stock Certificate*

                     5. Management Contract
   
                     6.1 Underwriting Agreement
    
                     6.2 Form of Dealer Sales Agreement*

                     7. None
   
                     8. Form of Custodian Agreement with Brown Brothers Harriman
                        & Co.*
    
             
                     9.1 Investment Company Service Agreement*
   
                     9.2 Plan of Reorganization
    
                     10. Legal Opinion of Hale and Dorr*

                     11. Consent of Arthur Andersen LLP

                     12. None

                     13. Form of Stock Purchase Agreement*

                     14. None

                     15. Distribution Plan*

                     16. Description of Average Annual Total Return*

                     18. Powers of Attorney 

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

*    Previously  filed.  Incorporated  by reference from the exhibits filed with
     the  Registration   Statement  (File  No.  2-79140),  as  amended,  of  the
     Registrant.  Parts A and B of this Registration  Statement describe certain
     changes from Registrant's current  Registration  Statement proposed to take
     effect on  February  1, 1996  following  approval  by  shareholders  of the
     Registrant  at a meeting  scheduled to be held on January 23,  1996.  These
     changes  include the  reorganization  of Registrant as a Delaware  business
     trust and the  adoption of a new  management  contract and Rule 12b-1 plans
     for two additional  classes of shares. If the proposed changes are approved
     by  shareholders,  Exhibits  relating  to the  same  will  be  filed  by an
     additional  Post-Effective  Amendment  under Rule 485(b)  which will become
     simultaneously effective with this Post-Effective Amendment No. 20.


Item 25. Persons Controlled By or Under
         Common Control With Registrant

         The  Pioneer  Group,  Inc.,  a  publicly-traded   Delaware  corporation
("PGI"),  owns 100% of the  outstanding  capital stock of Pioneering  Management
Corporation,  a Delaware  corporation  ("PMC"),  Pioneering Services Corporation
("PSC"),  Pioneer Funds Distributor,  Inc. ("PFD"),  Pioneer Capital Corporation
("PCC"),  Pioneer Fonds  Marketing GmbH ("GmbH"),  Pioneer SBIC Corp.  ("SBIC"),
Pioneer  Associates,  Inc.,  Pioneer  International  Corporation,  Pioneer Plans
Corporation ("PPC"), Pioneer Goldfields Limited ("PGL"), and Pioneer Investments
Corporation ("PIC"), all Massachusetts  corporations.  PGI also owns 100% of the
outstanding  capital stock of Pioneer Metals and  Technology,  Inc.  ("PMT"),  a
Delaware  corporation,  Pioneer Fonds Marketing GmbH, a German corporation,  and
Pioneer First Polish Trust Fund Joint Stock Company ("First  Polish"),  a Polish
corporation.  PGI owns 90% of the  outstanding  shares of  Teberebie  Goldfields
Limited  ("TGL").  Pioneer Fund,  Pioneer Europe Fund,  Pioneer II, Pioneer U.S.
Government Trust, Pioneer Bond Fund, Pioneer Intermediate Tax-Free Fund, Pioneer
Growth Trust,  Pioneer  International  Growth Fund,  Pioneer  Short-Term  Income
Trust,  Pioneer  Tax-Free State Series Trust,  and the  Registrant  (each of the
foregoing  are  Massachusetts  business  trusts);  Pioneer  Real Estate  Shares,
Pioneer  Interest  Shares,  Inc. (a Nebraska  corporation);  and Pioneer  Growth
Shares,  Pioneer  Money Market  Trust,  Pioneer  Income Fund,  Pioneer  Emerging
Markets  Fund,  Pioneer  India  Fund,  Pioneer  Small  Company  Fund and Pioneer
Tax-Free  Income Fund (each of the foregoing are Delaware  business  trusts) are
all parties to management  contracts with PMC. PCC owns 100% of the  outstanding
capital  stock of SBIC.  SBIC is the sole  general  partner of Pioneer  Ventures
Limited Partnership,  a Massachusetts  limited  partnership.  John F. Cogan, Jr.
owns  approximately 15% of the outstanding  shares of PGI. Mr. Cogan is Chairman
of the Board, President and Trustee of the Registrant and of each of the Pioneer
mutual funds; Director and President of PGI; President and Director of PPC, PIC,
Pioneer International  Corporation and PMT; Director of PCC and PSC; Chairman of
the Board and Director of PMC, PFD and TGL; Chairman,  President and Director of
PGL;  Chairman  of the  Supervisory  Board  of  GmbH;  Chairman  and  Member  of
Supervisory Board of First Polish and Chairman and Partner, Hale and Dorr.


Item 26. Number of Holders of Securities

         At October 31, 1995,  there were  approximately  63,273  holders of the
Registrant's shares.,


Item 27. Indemnification

         Except for the Declaration of Trust dated January 8, 1985, establishing
the  Registrant  as a Trust  under  Massachusetts  law,  there  is no  contract,
arrangement  or  statute  under  which any  director,  officer,  underwriter  or
affiliated  person of the Registrant is insured or indemnified.  The Declaration
of Trust  provides  that no Trustee or officer will be  indemnified  against any
liability to which the Registrant would otherwise be subject by reason of or for
willful  misfeasance,  bad faith, gross negligence or reckless disregard of such
person's duties.


Item 28. Business and Other Connections of Investment Adviser

         All of the  information  required by this item is set forth in the Form
ADV, as amended, of Pioneering Management Corporation. The following sections of
such Form ADV are incorporated herein by reference:

         (a) Items 1 and 2 of Part 2;

         (b) Section IV, Business Background, of each Schedule D.


Item 29. Principal Underwriter

                  (a)      See Item 25 above.
                  (b)      Directors and Officers of PFD:



<PAGE>






                         Positions and Offices          Positions and Offices
Name                     with Underwriter               with Registrant

John F. Cogan, Jr.       Director and Chairman          Chairman of the Board,
                                                        President and Trustee

Robert L. Butler         Director and President         None


David D. Tripple         Director                       Executive Vice
                                                        President and Trustee

Steven M. Graziano       Senior                         None
                         Vice President

Stephen W. Long          Senior                         None
                         Vice President

John W. Drachman         Vice President                 None

Barry G. Knight          Vice President                 None

William A. Misata        Vice President                 None

Anne W. Patenaude        Vice President                 None

Elizabeth B. Rice        Vice President                 None

Gail A. Smyth            Vice President                 None

Constance D. Spiros      Vice President                 None

Marcy L. Supovitz        Vice President                 None

Steven R. Berke          Assistant                      None
                         Vice President

Mary Sue Hoban           Assistant                      None
                         Vice President

William H. Keough        Treasurer                      Treasurer

Roy P. Rossi             Assistant Treasurer            None

Joseph P. Barri          Clerk                          Secretary

Robert P. Nault          Assistant Clerk                Assistant Secretary



<PAGE>


                  (c)      Not applicable.


Item 30. Location of Accounts and Records

         The accounts and records are maintained at the  Registrant's  office at
60 State Street, Boston, Massachusetts; contact the Treasurer.


Item 31. Management Services

         The  Registrant  is  not a  party  to  any  management-related  service
contract,  except as described in the  Prospectus  and  Statement of  Additional
Information.

Item 32. Undertaking

                  (a)      Not applicable.

                  (b)      Not applicable.

                  (c) The Registrant hereby undertakes to deliver or cause to be
delivered with the Prospectus,  to each person to whom the Prospectus is sent or
given, a copy of the Registrant's  report to shareholders  furnished pursuant to
and meeting the  requirements of Rule 30d-1 under the Investment  Company Act of
1940,  as amended,  from which the  specified  information  is  incorporated  by
reference,  unless such person  currently holds securities of the Registrant and
otherwise has received a copy of such report, in which case the Registrant shall
state in the Prospectus  that it will furnish,  without  charge,  a copy of such
report on request,  and the name,  address and telephone number of the person to
whom such a request should be directed.



<PAGE>



                                   SIGNATURES


         Pursuant  to the  requirements  of the  Securities  Act of 1933 and the
Investment  Company Act of 1940, the  Registrant  certifies that it meets all of
the requirements for  effectiveness of this  Post-Effective  Amendment No. 20 to
its Registration  Statement  pursuant to Rule 485(a) under the Securities Act of
1933  and  has  duly  caused  this  Post-Effective  Amendment  No.  20  to  such
Registration Statement to be signed on its behalf by the undersigned,  thereunto
duly authorized, in the City of Boston and The Commonwealth of Massachusetts, on
the 1st day of December, 1995.

                                        PIONEER THREE


                                        By:
                                           John F. Cogan, Jr.
                                           Chairman and President

         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Post-Effective  Amendment No. 20 to the Registrant's  Registration Statement has
been signed below by the  following  persons in the  capacities  and on the date
indicated:


      Signature                             Title



                                     Chairman of the Board      )
John F. Cogan, Jr.                   and President              )
                                     (Principal Executive       )
                                     Officer)                   )
                                                                )
                                                                )
/s/William H. Keough*                Chief Financial Officer    )
William H. Keough                    and Treasurer (Principal   )
                                     Financial and Accounting   )
                                     Officer)                   )

Trustees:

                                                                )
                                                                )
John F. Cogan, Jr.                                              )
                                                                )
                                                                )
/s/Richard H. Egdahl, M.D.*                                     )
Richard H. Egdahl, M.D.                                         )
                                                                )
                                                                )
/s/Margaret B. W. Graham*                                       )
Margaret B. W. Graham                                           )
                                                                )
                                                                )
/s/John W. Kendrick*                                            )
John W. Kendrick                                                )
                                                                )
                                                                )
/s/Marguerite A. Piret*                                         )
Marguerite A. Piret                                             )
                                                                )
                                                                )
/s/David D. Tripple*                                            )
David D. Tripple                                                )
                                                                )
                                                                )
/s/Stephen K. West*                                             )
Stephen K. West                                                 )
                                                                )
                                                                )
/s/John Winthrop*                                               )
John Winthrop                                                   )


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



*By:                                         Dated:  December 1, 1995
    -----------------------------
    John F. Cogan, Jr.
    Attorney-in-fact


<PAGE>


                                  Exhibit Index



Exhibit
Number     Document Title


   

5.         Management Contract

6.1        Underwriting Agreement

9.2        Plan of Reorganization

11.        Consent of Arthur Andersen LLP

18.        Powers of Attorney

    


 
 
                              MANAGEMENT CONTRACT
 
   
     THIS AGREEMENT dated this 1st day of February, 1996 between Pioneer Mid-Cap
Fund (formerly Pioneer Three), a Delaware business trust (the "Trust"), and
Pioneering Management Corporation, a Delaware corporation (the "Manager").
    
 
                              W I T N E S S E T H
 
     WHEREAS, the Trust is registered as an open-end, diversified, management
investment company under the Investment Company Act of 1940, as amended (the
"1940 Act"), and has filed with the Securities and Exchange Commission (the
"Commission") a registration statement (the "Registration Statement") for the
purpose of registering its shares for public offering under the Securities Act
of 1933, as amended (the "1933 Act"),
 
     WHEREAS, the parties hereto deem it mutually advantageous that the Manager
should be engaged, subject to the supervision of the Trust's Board of Trustees
and officers, to manage the Trust.
 
     NOW, THEREFORE, in consideration of the mutual covenants and benefits set
forth herein, the Trust and the Manager do hereby agree as follows:
 
     1.  (a) The Manager will regularly provide the Trust with investment
research, advice and supervision and will furnish continuously an investment
program for the Trust, consistent with the investment objectives and policies of
the Trust. The Manager will determine from time to time what securities shall be
purchased for the Trust, what securities shall be held or sold by the Trust and
what portion of the Trust's assets shall be held uninvested as cash, subject
always to the provisions of the Trust's Certificate of Trust, Agreement and
Declaration of Trust, By-Laws and its registration statements under the 1940 Act
and under the 1933 Act covering the Trust's shares, as filed with the Securities
and Exchange Commission, and to the investment objectives, policies and
restrictions of the Trust, as each of the same shall be from time to time in
effect, and subject, further, to such policies and instructions as the Board of
Trustees of the Trust may from time to time establish. To carry out such
determinations, the Manager will exercise full discretion and act for the Trust
in the same manner and with the same force and effect as the Trust itself might
or could do with respect to purchases, sales or other transactions, as well as
with respect to all other things necessary or incidental to the furtherance or
conduct of such purchases, sales or other transactions.
 
     (b) The Manager will, to the extent reasonably required in the conduct of
the business of the Trust and upon the Trust's request, furnish to the Trust
research, statistical and advisory reports upon the industries, businesses,
corporations or securities as to which such requests shall be made, whether or
not the Trust shall at the time have any investment in such industries,
businesses, corporations or securities. The Manager will use its best efforts in
the preparation of such reports and will endeavor to
 
                                       A-3

<PAGE>
 
consult the persons and sources believed by it to have information available
with respect to such industries, businesses, corporations or entities.
 
   
     (c) The Manager will maintain all books and records with respect to the
Trust's securities transactions required by sub paragraphs (b)(5), (6), (9) and
(10) and paragraph (f) of Rule 31a-1 under the 1940 Act (other than those
records being maintained by the custodian or transfer agent appointed by the
Trust) and preserve such records for the periods prescribed therefor by Rule
31a-2 under the 1940 Act. The Manager will also provide to the Board of Trustees
such periodic and special reports as the Board may reasonably request.
    
 
   
     2.  (a) Except as otherwise provided herein, the Manager, at its own
expense, shall furnish to the Trust office space in the offices of the Manager
or in such other place as may be agreed upon from time to time, and all
necessary office facilities, equipment and personnel for managing the Trust's
affairs and investments, and shall arrange, if desired by the Trust, for members
of the Manager's organization to serve as officers or agents of the Trust.
    
 
     (b) The Manager shall pay directly or reimburse the Trust for: (i) the
compensation (if any) of the Trustees who are affiliated with, or "interested
persons" (as defined in the 1940 Act) of, the Manager and all officers of the
Trust as such; and (ii) all expenses not hereinafter specifically assumed by the
Trust where such expenses are incurred by the Manager or by the Trust in
connection with the management of the affairs of, and the investment and
reinvestment of the assets of, the Trust.
 
   
     (c) The Trust shall assume and shall pay: (i) charges and expenses for fund
accounting, pricing and appraisal services and related overhead, including, to
the extent such services are performed by personnel of the Manager, or its
affiliates, office space and facilities and personnel compensation, training and
benefits; (ii) the charges and expenses of auditors; (iii) the charges and
expenses of any custodian, transfer agent, plan agent, dividend disbursing agent
and registrar appointed by the Trust with respect to the Trust; (iv) issue and
transfer taxes chargeable to the Trust in connection with securities
transactions to which the Trust is a party; (v) insurance premiums, interest
charges, dues and fees for membership in trade associations and all taxes and
corporate fees payable by the Trust to federal, state or other governmental
agencies; (vi) fees and expenses involved in registering and maintaining
registrations of the Trust and/or its shares with the Commission, state or blue
sky securities agencies and foreign countries, including the preparation of
Prospectuses and Statements of Additional Information for filing with the
Commission; (vii) all expenses of shareholders' and Trustees' meetings and of
preparing, printing and distributing prospectuses, notices, proxy statements and
all reports to shareholders and to governmental agencies; (viii) charges and
expenses of legal counsel to the Trust and the Trustees; (ix) any distribution
fees paid by the Trust in accordance with Rule 12b-1 promulgated by the
Commission pursuant to the 1940 Act; (x) compensation of those Trustees of the
Trust who are not affiliated with or interested persons of the Manager, the
Trust (other than as Trustees), The Pioneer Group, Inc. or Pioneer Funds
Distributor, Inc.; (xi) the cost of preparing and printing share certificates;
and (xii) interest on borrowed money, if any.
    
 
                                       A-4

<PAGE>
 
     (d) In addition to the expenses described in Section 2(c) above, the Trust
shall pay all brokers' and underwriting commissions chargeable to the Trust in
connection with securities transactions to which the Trust is a party.
 
     3.  (a) The Trust shall pay to the Manager, as compensation for the
Manager's services and expenses assumed hereunder, a fee as set forth below.
Management fees payable hereunder shall be computed daily and paid monthly in
arrears.
 
     (i) For the period beginning on the date this Contract becomes effective
and ending on June 30, 1996, the fee shall be paid at the annual rate of 0.50%
of the Trust's average daily net assets up to $250 million, 0.48% of the next
$50 million, and 0.45% of the excess over $300 million (the "Carryover Fee").
 
     (ii) For periods after June 30, 1996, the fee payable hereunder shall be
composed of the Basic Fee (defined below) and a Performance Adjustment (defined
below) to the Basic Fee based upon the investment performance of the Trust in
relation to the Standard & Poors Mid-Cap 400 Index (the "Index").
 
     (iii) The Basic Fee is payable at an annual rate of 0.625% of the Trust's
average daily net assets.
 
     (iv) The Performance Adjustment consists of an adjustment to the monthly
Basic Fee to be made by applying a performance adjustment rate to the average
net assets of the Trust over the performance period. The resulting dollar figure
will be added to or subtracted from the Basic Fee depending on whether the Trust
experienced better or worse performance than the Index.
 
     The Performance Adjustment rate is 0.02% per annum for each percentage
point rounded to the nearer point (the higher point if exactly one-half point)
that the Trust's investment performance for the period was better or worse than
the record of the index as then constituted. The maximum performance adjustment
is 0.20% per annum.
 
   
     The performance period will commence on February 1, 1996. During the first
five months thereafter there will be no Performance Adjustment and the Carryover
Fee will be in effect. Starting with July, 1996 and ending with December, 1997
(the "Transition Period"), the Performance Adjustment will take effect only if
this would have the effect of lowering the Basic Fee. Starting with January,
1997, the Performance Fee will take effect for purposes of both increasing and
lowering the Basic Fee.
    
 
     Starting with July, 1996, a new month will be added to the performance
period each month until the performance period equals 36 months. Thereafter, the
performance period will consist of the current month plus the preceding 35
months.
 
     The Trust's investment performance will be measured by comparing the (i)
opening net asset value of one share of the Trust on the first business day of
the performance period with (ii) the closing net asset value of the one share of
the Trust as of the last business day of such period. In computing the
investment performance of the Trust and the investment record of the Index,
distributions of realized capital gains, the value of capital gains taxes per
share paid or payable on undistributed realized long-term
 
                                       A-5

<PAGE>
 
capital gains accumulated to the end of such period and dividends paid out of
investment income on the part of the Trust, and all cash distributions of the
companies whose stock comprise the Index, will be treated as reinvested in
accordance with Rule 205-1 or any other applicable rule under the Investment
Advisers Act of 1940, as the same from time to time may be amended.
 
     The computation of the performance adjustment will not be cumulative.
Except during the Transition Period, a positive fee adjustment will apply even
though the performance of the Trust over some period of time shorter than the
performance period has been behind that of the Index, and, conversely, a
negative fee adjustment will apply for the month even though the performance of
the Trust over some period of time shorter than the performance period has been
ahead of that of the Index.
 
   
     (v) One-twelfth of the annual Performance Adjustment rate shall be applied
to the average of the net assets of the Trust (computed in the manner set forth
in the Declaration of Trust of the Trust adjusted as provided above, if
applicable) determined as of the close of business on each business day through
out the performance period. The resulting dollar amount is added to or deducted
from the Basic Fee.
    
 
     (vi) In the event of termination of this Agreement, the Carryover Fee or
Basic Fee then in effect shall be computed on the basis of the period ending on
the last business day on which this Agreement is in effect subject to a pro rata
adjustment based on the number of days elapsed in the current month as a
percentage of the total number of days in such month. The amount of any
Performance Adjustment to the Basic Fee will be computed on the basis of and
applied to net assets averaged over the 36 month period ending on the last
business day on which this Agreement is in effect, provided that if this
Agreement has been in effect less than 36 months, the computation will be made
on the basis of the period of time during which it has been in effect.
 
   
     (b) If the operating expenses of the Trust in any year exceed the limits
set by state securities laws or regulations in states in which shares of the
Trust are sold, the amount payable to the Manager under subsection (a) above
will be reduced (but not below $0), and the Manager shall make other
arrangements concerning expenses but, in each instance, only as and to the
extent required by such laws or regulations. If amounts have already been
advanced to the Manager under this Agreement, the Manager will return such
amounts to the Trust to the extent required by the preceding sentence.
    
 
   
     (c) In addition to the foregoing, the Manager may from time to time agree
not to impose all or a portion of its fee otherwise payable hereunder (in
advance of the time such fee or a portion thereof would otherwise accrue) and/or
undertake to pay or reimburse the Trust for all or a portion of its expenses not
otherwise required to be borne or reimbursed by the Manager. Any such fee
reduction or undertaking may be discontinued or modified by the Manager at any
time.
    
 
   
     4.  It is understood that the Manager may employ one or more sub-investment
advisers (each a "Subadviser") to provide investment advisory services to the
Trust by entering into a written agreement with each such Subadviser; provided,
that any such agreement first shall be approved by the vote of a majority of the
Trustees, including a
    
 
                                       A-6

<PAGE>
 
majority of the Trustees who are not "interested persons" (as defined in the
1940 Act) of the Trust, the Manager or any such Subadviser, at a meeting of
Trustees called for the purpose of voting on such approval and by the
affirmative vote of a "majority of the outstanding voting securities" (as
defined in the 1940 Act) of the Trust. The authority given to the Manager in
Sections 1 through 6 hereof may be delegated by it under any such agreement;
PROVIDED, that any Subadviser shall be subject to the same restrictions and
limitations on investments and brokerage discretion as the Manager. The Trust
agrees that the Manager shall not be accountable to the Trust or the Trust's
shareholders for any loss or other liability relating to specific investments
directed by any Subadviser, even though the Manager retains the right to reverse
any such investment, because, in the event a Subadviser is retained, the Trust
and the Manager will rely almost exclusively on the expertise of such Subadviser
for the selection and monitoring of specific investments.
 
   
     5.  The Manager will not be liable for any error of judgment or mistake of
law or for any loss sustained by reason of the adoption of any investment policy
or the purchase, sale, or retention of any security on the recommendation of the
Manager, whether or not such recommendation shall have been based upon its own
investigation and research or upon investigation and research made by any other
individual, firm or corporation, but nothing contained herein will be construed
to protect the Manager against any liability to the Trust or its shareholders by
reason of willful misfeasance, bad faith or gross negligence in the performance
of its duties or by reason of its reckless disregard of its obligations and
duties under this Agreement.
    
 
   
     6.  (a) Nothing in this Agreement will in any way limit or restrict the
Manager or any of its officers, Trustees, or employees from buying, selling or
trading in any securities for its or their own accounts or other accounts. The
Manager may act as an investment advisor to any other person, firm or
corporation, and may perform management and any other services for any other
person, association, corporation, firm or other entity pursuant to any contract
or otherwise, and take any action or do any thing in connection therewith or
related thereto; and no such performance of management or other services or
taking of any such action or doing of any such thing shall be in any manner
restricted or otherwise affected by any aspect of any relationship of the
Manager to or with the Trust or deemed to violate or give rise to any duty or
obligation of the Manager to the Trust except as otherwise imposed by law. The
Trust recognizes that the Manager, in effecting transactions for its various
accounts, may not always be able to take or liquidate investment positions in
the same security at the same time and at the same price.
    
 
   
     (b) In connection with purchases or sales of securities for the account of
the Trust, neither the Manager nor any of its Trustees, officers or employees
will act as a principal or agent or receive any commission except as permitted
by the 1940 Act. The Manager shall arrange for the placing of all orders for the
purchase and sale of securities for the Trust's account with brokers or dealers
selected by the Manager. In the selection of such brokers or dealers and the
placing of such orders, the Manager is directed at all times to seek for the
Trust the most favorable execution and net price available except as
    
 
                                       A-7

<PAGE>
 
described herein. It is also understood that it is desirable for the Trust that
the Manager have access to supplemental investment and market research and
security and economic analyses provided by brokers who may execute brokerage
transactions at a higher cost to the Trust than may result when allocating
brokerage to other brokers on the basis of seeking the most favorable price and
efficient execution. Therefore, the Manager is authorized to place orders for
the purchase and sale of securities for the Trust with such brokers, subject to
review by the Trust's Trustees from time to time with respect to the extent and
continuation of this practice. It is understood that the services provided by
such brokers may be useful to the Manager in connection with its or its
affiliates' services to other clients.
 
   
     (c) On occasions when the Manager deems the purchase or sale of a security
to be in the best interest of the Trust as well as other clients, the Manager,
to the extent permitted by applicable laws and regulations, may aggregate the
securities to be sold or purchased in order to obtain the best execution and
lower brokerage commissions, if any. In such event, allocation of the securities
so purchased or sold, as well as the expenses incurred in the transaction, will
be made by the Manager in the manner it considers to be the most equitable and
consistent with its fiduciary obligations to the Trust and to such clients.
    
 
   
     7.  This Agreement shall become effective on the date hereof and shall
remain in force until May 31, 1997 and from year to year thereafter, but only so
long as its continuance is approved annually by a vote of the Trustees of the
Trust voting in person, including a majority of its Trustees who are not parties
to this Agreement or "interested persons" (as defined in the 1940 Act) of any
such parties, at a meeting of Trustees called for the purpose of voting on such
approval or by a vote of a "majority of the outstanding voting securities" (as
defined in the 1940 Act) of the Trust, subject to the right of the Trust and the
Manager to terminate this contract as provided in Section 8 hereof.
    
 
   
     8.  Either party hereto may, without penalty, terminate this Agreement by
vote of its Board of Trustees or Directors, as the case may be, or by vote of a
"majority of its outstanding voting securities" (as defined in the 1940 Act) and
the giving of 60 days' written notice to the other party.
    
 
   
     9.  This Agreement shall automatically terminate in the event of its
assignment. For purposes of this Agreement, the term "assignment" shall have the
meaning given it by Section 2(a)(4) of the 1940 Act.
    
 
     10.  The Trust agrees that in the event that neither the Manager nor any of
its affiliates acts as an investment adviser to the Trust, the name of the Trust
will be changed to one that does not contain the name "Pioneer" or otherwise
suggest an affiliation with the Manager.
 
   
     11.  The Manager is an independent contractor and not an employee of the
Trust for any purpose. If any occasion should arise in which the Manager gives
any advice to its clients concerning the shares of the Trust, the Manager will
act solely as investment counsel for such clients and not in any way on behalf
of the Trust or any series thereof.
    
 
                                       A-8

<PAGE>
 
   
     12.  This Agreement states the entire agreement of the parties hereto, and
is intended to be the complete and exclusive statement of the terms hereof. It
may not be added to or changed orally, and may not be modified or rescinded
except by a writing signed by the parties hereto and in accordance with the 1940
Act, when applicable.
    
 
   
     13.  This Agreement and all performance hereunder shall be governed by and
construed in accordance with the laws of The Commonwealth of Massachusetts.
    
 
   
     14.  Any term or provision of this Agreement which is invalid or
unenforceable in any jurisdiction shall, as to such jurisdiction be ineffective
to the extent of such invalidity or unenforceability without rendering invalid
or unenforceable the remaining terms or provisions of this Agreement or
affecting the validity or enforceability of any of the terms or provisions of
this Agreement in any other jurisdiction.
    
 
   
     15.  This Agreement may be executed simultaneously in two or more
counterparts, each of which shall be deemed an original, but all of which
together shall constitute one and the same instrument.
    
 
   
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their duly authorized officers and their seal to be hereto affixed
as of the day and year first above written.
    
 
   

ATTEST:                                PIONEER MID-CAP FUND

                                       By:
- ---------------------------------         -----------------------------------
Joseph P. Barri                           John F. Cogan, Jr.
Secretary                                 Chairman and President


ATTEST:                                PIONEERING MANAGEMENT CORPORATION

                                       By:
- ---------------------------------         -----------------------------------
Joseph P. Barri                            David D. Tripple
Secretary                                  President


    
                                      -36-
 


                             UNDERWRITING AGREEMENT



         THIS UNDERWRITING  AGREEMENT,  dated as of this 8th day of August, 1991
by and between  Pioneer Three  ("Pioneer") and Pioneer Funds  Distributor,  Inc.
(the "Underwriter").


                               W I T N E S S E T H


         WHEREAS,  Pioneer, a Massachusetts  business trust, is registered as an
open-end,  diversified,  management  investment  company  under  the  Investment
Company Act of 1940, as amended (the "1940 Act"),  and has filed a  registration
statement  (the  "Registration  Statement")  with the  Securities  and  Exchange
Commission  (the   "Commission")  for  the  purpose  of  registering  shares  of
beneficial  interest for public  offering  under the  Securities Act of 1933, as
amended;

         WHEREAS, the Underwriter, a corporation organized under the laws of the
Commonwealth  of  Massachusetts  in 1989,  engages in the  purchase  and sale of
securities both as a broker and dealer and is registered as a broker-dealer with
the Commission  and is a member in good standing of the National  Association of
Securities Dealers, Inc. (the "NASD");

         WHEREAS,  the parties  hereto deem it  mutually  advantageous  that the
Underwriter should act as Principal Underwriter, as defined in the 1940 Act, for
the sale to the public of the shares of  beneficial  interest of the  securities
portfolio of each series of Pioneer which the Trustees may  establish  from time
to time (individually, a "Portfolio" and collectively, the "Portfolios"); and

         WHEREAS,  the parties  hereto have executed an  Underwriting  Agreement
dated January 30, 1990, and wish by this Agreement to amend and supersede in its
entirety such prior Agreement.

         NOW,  THEREFORE,  in consideration of the mutual covenants and benefits
set forth herein, Pioneer and the Underwriter do hereby agree as follows:

         l. Pioneer does hereby grant to the Underwriter the right and option to
purchase shares of beneficial  interest of a Portfolio of Pioneer (the "Shares")
for  sale  to   investors   either   directly  or   indirectly   through   other
broker-dealers. The Underwriter is not required to purchase any specified number
of Shares,  but will purchase from Pioneer only a sufficient number of Shares as
may be necessary to fill unconditional  orders received from time to time by the
Underwriter from investors and dealers.
<PAGE>

         2. The  Underwriter  shall  offer  Shares to the public at an  offering
price  based  upon  the net  asset  value of the  Shares,  to be  calculated  as
described in the Registration  Statement,  including the Prospectus,  filed with
the Commission and in effect at the time of the offering,  plus sales charges as
approved by the Underwriter and the Trustees of Pioneer and as further  outlined
in Pioneer's  Prospectus.  The offering price shall be subject to any provisions
set forth in the Prospectus from time to time with respect  thereto,  including,
without   limitation,   rights   of   accumulation,    letters   of   intention,
exchangeability of shares,  reinstatement privileges,  net asset value purchases
by  certain   persons  and   reinvestments   of   dividends   and  capital  gain
distributions.

         3.  In  the  case  of  all  Shares  sold  to  investors  through  other
broker-dealers,  a portion of applicable sales charges will be reallowed to such
broker-dealers  who are members of the NASD or, in the case of certain  sales by
banks or certain sales to foreign  nationals,  to brokers or dealers exempt from
registration  with the Commission.  The concession  reallowed to  broker-dealers
shall be set forth in a written sales  agreement and shall be generally the same
for broker-dealers providing comparable levels of sales and service.

         4. This  Agreement  may be  terminated by either party upon sixty days'
written notice.

         5. This  Agreement  shall  terminate on any  anniversary  hereof if its
terms and renewal have not been  approved by a majority  vote of the Trustees of
Pioneer  voting in person,  including  a majority  of its  Trustees  who are not
"interested  persons" of the Trust and who have no direct or indirect  financial
interest  in  the  operation  of  the  Underwriting  Agreement  (the  "Qualified
Trustees"),  at a meeting of  Trustees  called for the purpose of voting on such
approval.  This Agreement may also be terminated at any time, without payment of
any penalty, by Pioneer on sixty days' written notice to the Underwriter,  or by
the  Underwriter  upon similar  notice to Pioneer.  This  Agreement  may also be
terminated  by a party upon five (5) days  written  notice to the other party in
the event that the  Commission  has issued an order or obtained an injunction or
other  court  order  suspending  effectiveness  of  the  Registration  Statement
covering these shares of Pioneer. Finally, this Agreement may also be terminated
by Pioneer upon five (5) days written notice to the Underwriter  provided either
of the following events has occurred:  (i) the NASD has expelled the Underwriter
or suspended its  membership in that  organization;  or (ii) the  qualification,
registration, license or right of the Underwriter to sell shares in a particular
state has been suspended or cancelled in a state in which sales of the shares of
Pioneer  during the most recent l2 month  period  exceeded  10% of all shares of
Pioneer sold by the Underwriter during such period.

                                      -2-
<PAGE>

         6. The  compensation for the services of the Underwriter as a principal
underwriter  under  this  Agreement  shall be (i) that part of the sales  charge
which  is  retained  by  the   Underwriter   after  allowance  of  discounts  to
broker-dealers  as  set  forth  in the  Registration  Statement,  including  the
Prospectus, filed with the Commission and in effect at the time of the offering,
as amended,  and (ii) those amounts payable to the Underwriter as  reimbursement
of  expenses  pursuant  to any  distribution  plan for  Pioneer  which may be in
effect.  Nothing  contained herein shall relieve Pioneer of any obligation under
its  management  contract  or any  other  contract  with  any  affiliate  of the
Underwriter.

         7.  The  parties  to this  Agreement  acknowledge  and  agree  that all
liabilities  arising  hereunder,  whether  direct  or  indirect,  of any  nature
whatsoever, including without limitation, liabilities arising in connection with
any  agreement of Pioneer of its  Trustees as set forth herein to indemnify  any
party to this  Agreement or any other person,  if any, shall be satisfied out of
the  assets  of  Pioneer  and that no  Trustee,  officer  or holder of shares of
beneficial  interest  of  Pioneer  shall  be  personally  liable  for any of the
foregoing  liabilities.  Pioneer's Declaration of Trust, as amended from time to
time,  is on file in the Office of  Secretary  of State of The  Commonwealth  of
Massachusetts.  The  Declaration  of Trust  describes  in detail the  respective
responsibilities  and  limitations on liability of the Trustees,  officers,  and
holders of shares of beneficial interest.

         8. This  Agreement  shall  automatically  terminate in the event of its
assignment (as that term is defined in the 1940 Act).

         9. In the event of any dispute  between  the  parties,  this  Agreement
shall be construed according to the laws of The Commonwealth of Massachusetts.

         10. This  Agreement is intended to amend and  supersede in its entirety
the existing Underwriting Agreement between the parties dated January 30, 1990.

                                      -3-
<PAGE>


         IN WITNESS  WHEREOF,  the parties hereto have caused this instrument to
be  executed  by their duly  authorized  officers  and their  seals to be hereto
affixed as of day and year first above written.



ATTEST:  PIONEER THREE




/s/Joseph P. Barri                      By:/s/John F. Cogan, Jr.
   Secretary                               President



ATTEST:  PIONEER FUNDS DISTRIBUTOR, INC.




/s/Joseph P. Barri                      By:/s/John F. Cogan, Jr.
   Clerk                                   President



 
                      AGREEMENT AND PLAN OF REORGANIZATION
 
   
     THIS AGREEMENT AND PLAN OF REORGANIZATION is made as of the 31st day of
January, 1996, by and between Pioneer Three, a Massachusetts business trust (the
"Current Fund"), and Pioneer Mid-Cap Fund, a business trust duly formed under
the laws of the State of Delaware (the "Successor Trust").
    
 
   
     This Agreement is intended to be and is adopted as a plan of reorganization
within the meaning of Section 368 (a)(1) of the U.S. Internal Revenue Code of
1986, as amended (the "Code"), and is intended to effect the reorganization (a
"reorganization") of the Current Fund, as a new separate series of the Successor
Trust. The reorganization will involve the transfer of all of the assets of the
Current Fund to the sole series of the Successor Trust (the "Successor Fund")
solely in exchange for (1) assumption by the Successor Fund of all liabilities
of the Current Fund and (2) the issuance of shares of beneficial interest (the
"Successor Shares") by the Successor Trust on behalf of the Successor Fund to
the Current Fund, followed by the pro rata distribution on the Closing Date (as
defined below) of the Successor Shares to the holders of shares of beneficial
interest of the Current Fund (the "Current Fund Shareholders") in exchange for
their shares of the Current Fund in liquidation and termination of the Current
Fund, all upon the terms and conditions hereinafter set forth in this Agreement.
    
 
     In consideration of the premises and of the covenants and agreements
hereinafter set forth the parties hereto covenant and agree as follows.
 
   
1. TRANSFER OF ASSETS OF THE CURRENT FUND IN EXCHANGE FOR ASSUMPTION OF
   LIABILITIES AND ISSUANCE OF SUCCESSOR SHARES OF THE SUCCESSOR TRUST;
   TERMINATION OF THE CURRENT FUND
    
 
   
     1.1  Subject to the terms and conditions set forth herein and on the basis
of the representations and warranties contained herein, the Current Fund agrees
to transfer all of the assets of the Current Fund as set forth in paragraph 1.2
and assign and transfer all of its liabilities to the Successor Fund of the
Successor Trust which has been established solely for the purpose of acquiring
all of the assets and assuming all of the liabilities of the Current Fund. The
Successor Trust has not issued any Shares or commenced operations. The Successor
Trust on behalf of the Successor Fund agrees that in exchange for all of the
assets of the Current Fund (1) the Successor Fund shall assume all of the
liabilities of the Current Fund, whether contingent or otherwise, then existing,
and further (2) the Successor Trust shall deliver to the Current Fund the number
of full and fractional Successor Shares equal to the value of the assets of the
Current Fund transferred to the Successor Fund, minus the liabilities of the
Current Fund assumed by the Successor Fund (the "Net Assets"), as described in
paragraph 3.1 on the Closing Date provided for in paragraph 3.1. Such
transactions shall take place at the Closing provided for in paragraph 3.1.
    
 
                                       B-1

<PAGE>
 
     1.2  The assets of the Current Fund to be acquired by the Successor Fund
shall include, without limitation, all cash, cash equivalents, securities,
receivables (including interest and dividends receivable), any claims or rights
of action or rights to register shares under applicable securities laws, any
books or records of the Current Fund
   
and other property owned by the Current Fund and any deferred or prepaid
expenses
    
   
shown as assets on the books of the Current Fund on the Closing Date provided
for in paragraph 3.1.
    
 
     1.3  Immediately upon delivery to the Current Fund of Successor Shares, any
duly authorized officer of the Current Fund shall cause the Current Fund, as the
then sole shareholder of the Successor Fund, to (i) elect as Trustees of the
Successor Trust the persons who currently serve as Trustees of the Current Fund;
(ii) ratify the selection of the independent accountants; (iii) approve an
investment advisory agreement for the Successor Fund in the form currently
approved by the shareholders of the Current Fund; (iv) approve a Rule 12b-1 plan
in the form currently in place with respect to the Current Fund; and (v) adopt,
on behalf of the Successor Fund, the investment objectives, investment policies
and investment restrictions of the Current Fund.
 
   
     1.4  As provided in paragraph 3.4, on the Closing Date the Current Fund
will distribute in liquidation the Successor Shares pro rata in proportion to
the Current Fund's respective shares of beneficial interest in the Current Fund
("Current Fund Shares") to Current Fund Shareholders of record determined as of
the close of business on the Closing Date, in exchange for the Current Fund
Shares. Such distribution will be accomplished by the transfer of the Successor
Shares then credited to the account of the Current Fund on the share records of
the Successor Trust to open accounts on those records in the names of the
Current Fund Shareholders and representing the respective pro rata number of the
Successor Shares received from the Successor Trust on behalf of the Successor
Fund due the Current Fund Shareholders. The Successor Trust shall not issue
certificates representing Successor Shares in connection with such distribution.
Fractional Successor Shares shall be rounded to the third place after the
decimal point.
    
 
   
     1.5  As soon as practicable after the distribution of the Successor Shares
as set forth in Section 1.4, the Current Fund shall be terminated and any such
further actions shall be taken in connection therewith as are required by
applicable law.
    
 
     1.6  Ownership of the Successor Shares of each Successor Fund Shareholder
shall be maintained separately on the books of Pioneering Services Corporation
as the Successor Trust's shareholder services and transfer agent.
 
     1.7  Any transfer taxes payable upon issuance of Successor Shares in a name
other than the registered holder of the Current Fund Shares on the books of the
Current Fund as of that time shall be paid by the person to whom such Successor
Shares are to be distributed as a condition of such transfer.
 
   
2.  VALUATION
    
 
     2.1  The value of the Current Fund's Net Assets to be acquired by the
Successor Trust on behalf of the Successor Fund hereunder shall be the net asset
value computed
 
                                       B-2

<PAGE>
 
as of the valuation time provided in the Current Fund's prospectus on the
Closing Date using the valuation procedures set forth in the Current Fund's
current prospectus or statement of additional information.
 
     2.2  The value of full and fractional Successor Shares to be issued in
exchange for the Current Fund's Net Assets shall be equal to the value of the
Net Assets of the Current Fund on the Closing Date, and the number of such
Successor Shares shall equal the number of full and fractional Current Fund
Shares of the Current Fund on the Closing Date.
 
     2.3  All computations of value shall be made by Brown Brothers Harriman &
Co. as custodian for the Current Fund and the Successor Trust.
 
   
3.  CLOSING AND CLOSING DATE
    
 
   
     3.1  The transfer of the Current Fund's assets in exchange for the
assumption by the Successor Fund of the Current Fund's liabilities and the
issuance of Successor Shares to the Current Fund, as described above, together
with related acts necessary to consummate such acts (the "Closing"), shall occur
at the offices of Hale and Dorr at 60 State Street, Boston, Massachusetts 02109
on January 31, 1996 ("Closing Date"), or at such other place or date on or prior
to March 31, 1996 as the parties may agree in writing. All acts taking place at
the Closing shall be deemed to take place simultaneously as of the last daily
determination of the net asset value of any Current Fund or at such other time
and/or place as the parties may agree.
    
 
   
     3.2  In the event that on the Closing Date (a) the New York Stock Exchange
is closed to trading or trading thereon is restricted or (b) trading or
reporting of trading on said Exchange or in any market in which portfolio
securities of any Current Fund are traded is disrupted so that accurate
appraisal of the value of the total net assets of the Current Fund is
impracticable, the Closing shall be postponed until the first business day upon
which trading shall have been fully resumed and reporting shall have been
restored.
    
 
     3.3  The Current Fund shall deliver at the Closing a certificate or
separate certificates of an authorized officer stating that it has notified the
Custodian, as custodian for the Current Fund, of the Current Fund's
reorganization as the Successor Fund.
 
     3.4  Pioneering Services Corporation, as shareholder services and transfer
agent for the Current Fund, shall deliver at the Closing a certificate as to the
conversion on its books and records of the Current Fund Shareholder account to
an account as a holder of Successor Shares. The Successor Trust shall issue and
deliver to the Current Fund a confirmation evidencing the Successor Shares to be
credited on the Closing Date or provide evidence satisfactory to the Current
Fund that such Successor Shares have been credited to the Current Fund's account
on the books of the Successor Trust. At the Closing each party shall deliver to
the other such bills of sale, checks, assignments, stock certificates, receipts
or other documents as such other party or its counsel may reasonably request.
 
                                       B-3

<PAGE>
 
     3.5  Portfolio securities that are not held in book-entry form in the name
of the Custodian as record holder for the Current Fund shall be presented by the
Current Fund to the Custodian for examination no later than five business days
preceding the Closing Date. Portfolio securities which are not held in
book-entry form shall be delivered by the Current Fund to the Custodian for the
account of the Successor Fund on the Closing Date, duly endorsed in proper form
for transfer, in such condition as to constitute good delivery thereof in
accordance with the custom of brokers, and shall be accompanied by all necessary
federal and state stock transfer stamps or a check for the appropriate purchase
price thereof. Portfolio securities held of record by the Custodian in
book-entry form on behalf of the Current Fund shall be delivered to the
Successor Fund by the Custodian by recording the transfer of beneficial
ownership thereof on its records. The cash delivered shall be in the form of
currency or by the Custodian crediting the Successor Fund' account maintained
with the Custodian with immediately available funds.
 
   
4.  REPRESENTATIONS AND WARRANTIES
    
 
     4.1  The Current Fund represents and warrants as follows:
 
          4.1.A.  The Current Fund is a business trust duly organized, validly
     existing and in good standing under the laws of The Commonwealth of
     Massachusetts and has the power to own all of its properties and assets
     and, subject to approval by the shareholders of the Current Fund, to
     perform its obligations under this Agreement. The Current Fund is not
     required to qualify to do business in any jurisdiction in which it is not
     so qualified or where failure to qualify would not subject it to any
     material liability or disability. The Current Fund has all necessary
     federal, state and local authorizations to own all of its properties and
     assets and to carry on its business as now being conducted;
 
   
          4.1.B.  The Current Fund is a registered investment company classified
     as a management company of the open-end type and its registration with the
     Securities and Exchange Commission (the "Commission") as an investment
     company under the Investment Company Act of 1940, as amended (the "1940
     Act"), is in full force and effect;
    
 
   
          4.1.C.  The Current Fund is not, and the execution, delivery and
     performance of this Agreement will not result, in violation of any
     provision of its Declaration of Trust or By-laws, or any agreement,
     indenture, instrument, contract, lease or other undertaking to which the
     Current Fund is a party or by which the Current Fund is bound;
    
 
   
          4.1.D.  The Current Fund has no material contracts or other
     commitments (other than this Agreement or agreements on behalf of a Current
     Fund for the purchase of securities entered into in the ordinary course of
     business and consistent with its obligations under this Agreement) that
     will not be terminated without liability to the Current Fund on or prior to
     the Closing Date;
    
 
                                       B-4

<PAGE>
 
   
          4.1.E.  No material litigation or administrative proceeding or
     investigation of or before any court or governmental body presently is
     pending or threatened against the Current Fund or any of its properties or
     assets. The Current Fund knows of no facts that might form the basis for
     the institution of such proceedings and the Current Fund is not a party to,
     or subject to, the provisions of any order, decree or judgment of any court
     or governmental body that materially and adversely affects its business or
     its ability to consummate the transactions herein contemplated;
    
 
   
          4.1.F.  At the date hereof and at the Closing Date, all federal, state
     and other tax returns and reports, including information returns and payee
     statements, of the Current Fund required by law to have been filed or
     furnished by such dates shall have been filed or furnished and all federal,
     state and other taxes, interest and penalties shall have been paid so far
     as due or provision shall have been made for the payment thereof and no
     such return is currently under audit and no assessment has been asserted
     with respect to any of such returns or reports;
    
 
   
          4.1.G.  The Current Fund has elected to be treated as a regulated
     investment company under Subchapter M of the Code, has qualified as such
     for each taxable year since its inception, and will qualify as such as of
     the Closing Date;
    
 
   
          4.1.H.  The authorized capital of the Current Fund consists of an
     unlimited number of shares of beneficial interest. All issued and
     outstanding shares of beneficial interest of the Current Fund are, and at
     the Closing Date will be, duly and validly issued and outstanding, fully
     paid and nonassessable. The Current Fund does not have outstanding any
     options, warrants or other rights to subscribe for or purchase any of its
     shares of beneficial interest, nor is there outstanding any security
     convertible into any of its shares of beneficial interest;
    
 
   
          4.1.I.  The information to be furnished by the Current Fund for use in
     applications for orders, registration statements, proxy materials and other
     documents which may be necessary in connection with the transactions
     contemplated hereby shall be accurate and complete and shall comply in all
     material respects with federal securities and other laws and regulations
     thereunder applicable thereto;
    
 
   
          4.1.J.  All of the issued and outstanding Current Fund Shares will at
     the time of the Closing be held by the persons and in the amounts as
     certified in accordance with the provisions of paragraph 3.4;
    
 
   
          4.1.K.  At the Closing Date, the Current Fund will have good and
     marketable title to the assets to be transferred to the Successor Fund
     pursuant to paragraph 1.1, and full right, power and authority to sell,
     assign, transfer and deliver such assets hereunder, and upon delivery and
     in payment for such assets, the Successor Fund will acquire good and
     marketable title thereto subject to no restrictions on the full transfer
     thereof, including such restrictions as might arise under the Securities
     Act of 1933, as amended;
    
 
   
          4.1.L.  The execution, delivery and performance of this Agreement will
     have been duly authorized prior to the Closing Date by all necessary action
     on the part of
    
 
                                       B-5

<PAGE>
 
     the Current Fund and this Agreement constitutes a valid and binding
     obligation of the Current Fund enforceable in accordance with its terms,
     subject to the approval of the Current Fund's Shareholders; and
 
   
          4.1.M.  No consent, approval, authorization or order of any court or
     governmental authority is required for the consummation by the Current Fund
     of the transactions contemplated herein, except such as shall have been
     obtained prior to the Closing Date.
    
 
     4.2  The Successor Trust represents and warrants as follows:
 
   
          4.2.A.  The Successor Trust is a business trust duly organized,
     validly existing and in good standing under the laws of the State of
     Delaware and has the power to own all of its properties and assets and to
     perform its obligations under this Agreement; the Successor Trust is not
     required to qualify to do business in any jurisdiction in which it is not
     so qualified or where failure to qualify would not subject it to any
     material liability or disability; the Successor Trust has all necessary
     federal, state and local authorizations to own all of its properties and
     assets and to carry on its business as now being conducted; that as of the
     date hereof and as of the Closing Date, the Successor Fund is the only
     series of the Successor Trust; and the Successor Fund is a duly established
     and designated series of the Successor Trust;
    
 
   
          4.2.B.  The Successor Trust is not, and the execution, delivery and
     performance of this Agreement will not result, in violation of any
     provision of the Declaration of Trust or By-laws of the Successor Trust or
     any agreement, indenture, instrument, contract, lease or other undertaking
     to which the Successor Trust is a party or by which the Successor Trust is
     bound;
    
 
   
          4.2.C.  No material litigation or administrative proceeding or
     investigation of or before any court or governmental body is presently
     pending or threatened against the Successor Trust or any of its properties
     or assets. The Successor Trust knows of no facts that might form the basis
     for the institution of such proceedings, and the Successor Trust is not a
     party to, or subject to, the provisions of any order, decree or judgment of
     any court or governmental body that materially and adversely affects its
     business or its ability to consummate the transactions herein contemplated;
    
 
   
          4.2.D.  The Successor Trust will cause the Successor Fund to qualify
     as a regulated investment company under subchapter M of the Code for the
     taxable year in which the Closing occurs and to continue to qualify as such
     for each taxable year;
    
 
   
          4.2.E.  Prior to the Closing Date, there shall be no issued and
     outstanding Successor Shares or any other securities of the Successor
     Trust; Successor Shares issued in connection with the transactions
     contemplated herein will be duly and validly issued and outstanding and
     fully paid and non-assessable;
    
 
   
          4.2.F.  The execution, delivery and performance of this Agreement has
     been duly authorized by all necessary action on the part of the Successor
     Trust, and this
    
 
                                       B-6

<PAGE>
 
     Agreement constitutes a valid and binding obligation of the Successor Trust
     enforceable against the Successor Trust in accordance with its terms;
 
   
          4.2.G.  The information to be furnished by the Successor Trust for use
     in applications for orders, registration statements, proxy materials and
     other documents which may be necessary in connection with the transactions
     contemplated hereby shall be accurate and complete and shall comply in all
     material respects with Federal securities and other laws and regulations
     applicable thereto; and
    
 
   
          4.2.H.  No consent, approval, authorization or order of any court or
     governmental authority is required for the consummation by the Successor
     Trust of the transactions contemplated herein, except such as shall have
     been obtained prior to the Closing Date.
    
 
   
5.  COVENANTS OF THE CURRENT FUND AND THE SUCCESSOR TRUST
    
 
     5.1  The Current Fund covenants that the Successor Shares are not being
acquired for the purpose of making any distribution thereof, other than in
accordance with the terms of this Agreement.
 
     5.2  The Current Fund covenants that it will assist the Successor Trust in
obtaining such information as the Successor Trust reasonably requests concerning
the beneficial ownership of Current Fund Shares.
 
     5.3  The Current Fund will, from time to time, as and when requested by the
Successor Trust execute and deliver, or cause to be executed and delivered, all
such assignments and other instruments, and will take or cause to be taken such
further action, as the Successor Trust may deem necessary or desirable in order
to vest in, and confirm to, the Successor Fund, title to, and possession of, all
the assets of the Current Fund to be sold, assigned, transferred and delivered
hereunder and otherwise to carry out the intent and purpose of this Agreement.
 
     5.4  The Successor Trust will, from time to time, as and when requested by
the Current Fund, execute and deliver or cause to be executed and delivered all
such assignments and other instruments, and will take or cause to be taken such
further action, as the Current Fund may deem necessary or desirable in order to
vest in, and confirm to, the Current Fund, on behalf of the Current Funds, title
to, and possession of, the Successor Shares issued, sold, assigned, transferred
and delivered hereunder and otherwise to carry out the intent and purpose of
this Agreement.
 
     5.5  The Successor Trust shall use all reasonable efforts to obtain the
approvals and authorizations required by the 1933 Act, the 1940 Act and such
state securities laws as it may deem appropriate in order to operate after the
Closing Date.
 
     5.6  Subject to the provisions of this Agreement, the Successor Trust and
the Current Fund each will take, or cause to be taken, all action and will do or
cause to be done all things reasonably necessary, proper or advisable to
consummate and make effective the transactions contemplated by this Agreement.
 
                                       B-7

<PAGE>
 
     5.7  As promptly as practicable, but in any event within 60 days after the
Closing Date, the Current Fund shall furnish to the Successor Trust, in such
form as is reasonably satisfactory to the Successor Trust, a statement of the
earnings and profits of the Current Fund for federal income tax purposes, and of
any capital loss carryovers and other items that will be carried over to the
Successor Fund as a result of Section 381 of the Code, and which statement will
be certified by the President or Treasurer of the Current Fund.
 
   
6. CONDITIONS PRECEDENT TO OBLIGATIONS OF THE CURRENT FUND
    
 
     The obligations of the Current Fund to consummate the transactions provided
for herein shall be subject to the performance by the Successor Trust of all the
obligations to be performed by the Successor Trust hereunder on or before the
Closing Date and, in addition thereto, to the following further conditions:
 
     6.1  All representations and warranties of the Successor Trust contained in
this Agreement shall be true and correct in all material respects as of the date
hereof except as they may be affected by the transactions contemplated by this
Agreement, as of the Closing Date, with the same force and effect as if made on
and as of the Closing Date; and
 
     6.2  The Successor Trust shall have delivered on the Closing Date to the
Current Fund a certificate executed in the Successor Trust's name by its
President or Vice President, in form and substance satisfactory to the Current
Fund, dated as of the Closing Date, to the effect that the representations and
warranties of the Successor Trust made in this Agreement are true and correct at
and as of the Closing Date, except as they may be affected by the transactions
contemplated by this Agreement, and as to such other matters as the Current Fund
shall reasonably request.
 
   
     Each of the foregoing conditions precedent may be waived by the Current
Fund.
    
 
   
7. CONDITIONS PRECEDENT TO OBLIGATIONS OF THE SUCCESSOR TRUST
    
 
     The obligations of the Successor Trust to consummate the transactions
provided for herein shall be subject to the performance by the Current Fund of
all the obligations to be performed by the Current Fund hereunder on or before
the Closing Date and, in addition thereto, to the following further conditions:
 
     7.1  All representations and warranties of the Current Fund contained in
this Agreement shall be true and correct in all material respects as of the date
hereof and, except as they may be affected by the transactions contemplated by
this Agreement, as of the Closing Date, with the same force and effect as if
made on and as of the Closing Date;
 
     7.2  The Current Fund shall have delivered to the Successor Trust on the
Closing Date a statement of the Current Fund's assets and liabilities, prepared
in accordance with generally accepted accounting principles consistently
applied, together with a certificate of the Treasurer or Assistant Treasurer of
the Current Fund as to its portfolio securities
 
                                       B-8

<PAGE>
 
and the Current Fund's federal income tax basis and holding period for each such
portfolio security as of the Closing Date; and
 
     7.3  The Current Fund shall have delivered to the Successor Trust on the
Closing Date a certificate executed in the Current Fund's name by its President
or Vice President, in form and substance satisfactory to the Successor Trust,
dated as of the Closing Date, to the effect that the representations and
warranties of the Current Fund made in this Agreement are true and correct at
and as of the Closing Date, except as they may be affected by the transactions
contemplated by this Agreement, and as to such other matters as the Successor
Trust shall reasonably request.
 
     Each of the foregoing conditions precedent may be waived by the Successor
Trust.
 
   
8.  FURTHER CONDITIONS PRECEDENT TO OBLIGATIONS OF THE CURRENT FUND AND THE
    SUCCESSOR TRUST
    
 
     The obligations of the Current Fund and the Successor Trust are each
subject to the further conditions that on or before the Closing Date:
 
     8.1  This Agreement and the transactions contemplated herein shall have
been approved by the requisite vote of the Current Fund's Shareholders in
accordance with applicable law;
 
     8.2  On the Closing Date, no action, suit or other proceeding shall be
pending before any court or governmental agency in which it is sought to
restrain or prohibit or to obtain damages or other relief in connection with,
the transactions contemplated hereby;
 
     8.3  All consents of other parties and all other consents, orders and
permits of federal, state and local regulatory authorities (including those of
the Commission and of state securities authorities) deemed necessary by the
Successor Trust or the Current Fund to permit consummation, in all material
respects, of the transactions contemplated hereby shall have been obtained,
except where failure to obtain any such consent, order or permit would not
involve a risk of a material adverse effect on the assets or properties of the
Successor Trust or the Current Fund, provided that either party hereto may for
itself waive any of such conditions;
 
     8.4  The President of the Successor Trust shall have delivered a
certificate to the Current Fund on the Closing Date certifying that the
Successor Trust has taken all necessary action so that it shall be a registered
open-end investment company under the 1940 Act; and
 
     8.5  The Current Fund and the Successor Trust shall have received on or
before the Closing Date an opinion of Hale and Dorr satisfactory to the Current
Fund and the Successor Trust, substantially to the effect that, with respect to
the Current Fund, for federal income tax purposes:
 
   
          8.5.A.  The acquisition of all of the assets of a Current Fund by the
     Successor Fund solely in exchange for the issuance of Successor Shares to
     the Current Fund and the assumption by the Successor Fund of all of the
     liabilities of the Current
    
 
                                       B-9

<PAGE>
 
   
     Fund, followed by the distribution in liquidation by the Current Fund of
     such Successor Shares to the Current Fund Shareholders in exchange for
     their Current Fund Shares and the termination of the Current Fund, will
     constitute a reorganization within the meaning of Section 368(a)(1) of the
     Code, and the Current Fund and the Successor Fund will each be "a party to
     a reorganization" within the meaning of Section 368(b) of the Code;
    
 
   
          8.5.B.  No gain or loss will be recognized by the Current Fund upon
     (i) the transfer of all of its assets to the Successor Fund solely in
     exchange for the issuance of Successor Shares to the Current Fund and the
     assumption by the Successor Fund of the Current Fund's liabilities and (ii)
     the distribution by the Current Fund of the Successor Shares to the Current
     Fund Shareholders;
    
 
   
          8.5.C.  No gain or loss will be recognized by any Successor Fund upon
     its receipt of all of the Current Fund's assets solely in exchange for the
     issuance of the Successor Shares to the Current Fund and the assumption by
     the Successor Fund of all of the liabilities of the Current Fund;
    
 
   
          8.5.D.  The tax basis of the assets acquired by a Successor Fund from
     the Current Fund will be the same as the tax basis of those assets in the
     Current Fund's hands immediately before the transfer;
    
 
   
          8.5.E.  The tax holding period of the assets of the Current Fund in
     the hands of the Successor Fund will include the Current Fund's tax holding
     period for those assets;
    
 
   
          8.5.F.  The Current Fund's Shareholders will not recognize gain or
     loss upon the exchange of all of their Current Fund Shares solely for
     Successor Shares as part of the transaction;
    
 
   
          8.5.G.  The tax basis of the Successor Shares received by Current Fund
     Shareholders in the transaction will be, for each shareholder, the same as
     the tax basis of the Current Fund Shares surrendered in exchange therefor;
     and
    
 
   
          8.5.H.  The tax holding period of the Successor Shares received by
     Current Fund Shareholders will include, for each such Shareholder, the tax
     holding period for the Current Fund Shares surrendered in exchange
     therefor, provided that the Current Fund Shares were held as capital assets
     on the date of the exchange.
    
 
     The Current Fund and Successor Trust each agree to make and provide
representations with respect to the Current Fund and the Successor Fund which
are reasonably necessary to enable Hale and Dorr to deliver an opinion
substantially as set forth in this paragraph 8.5, which opinion may address such
other federal income tax consequences, if any, as Hale and Dorr believes to be
material to the transaction.
 
     Each of the foregoing conditions precedent to the obligations of a party,
except for the receipt of the opinion of Hale and Dorr set forth in paragraph
8.5, may be waived by that party.
 
                                      B-10

<PAGE>
 
   
9.  BROKERAGE FEES AND EXPENSES
    
 
     9.1  The Successor Trust and the Current Fund each represent and warrant to
the other that there are no broker's or finder's fees payable in connection with
the transactions contemplated hereby.
 
     9.2  The Current Fund and the Successor Fund shall each be liable for its
own expenses incurred in connection with entering into and carrying out the
provisions of this Agreement whether or not the transactions contemplated hereby
are consummated; if the transactions are consummated, such expenses of the
Current Fund will be assumed by the Successor Fund as part of the transactions.
 
   
10.  ENTIRE AGREEMENT
    
 
     The Successor Trust and the Current Fund agree that neither party has made
any representation, warranty or covenant not set forth herein and that this
Agreement constitutes the entire agreement between the parties. The
representations, warranties and covenants contained herein or in any document
delivered pursuant hereto or in connection herewith shall survive the
consummation of the transactions contemplated hereunder.
 
   
11.  TERMINATION
    
 
     11.1  This Agreement may be terminated by the mutual agreement of the
Successor Trust and the Current Fund. In addition, either the Successor Trust or
the Current Fund may at its option terminate this Agreement at or prior to the
Closing Date because:
 
   
          11.1.A.  There exists a material breach by the other party of any
     representations, warranties or agreements contained herein to be performed
     at or prior to the Closing Date; or
    
 
   
          11.1.B.  A condition herein expressed to be precedent to the
     obligations of the terminating party has not been met and it reasonably
     appears that it will not or cannot be met.
    
 
     11.2  In the event of any such termination, there shall be no liability for
damages on the part of the Successor Trust or the Current Fund, or their
respective trustees, directors or officers, to the other party or its trustees,
directors or officers.
 
   
12.  AMENDMENT
    
 
     This Agreement may be amended, modified or supplemented in such manner as
may be mutually agreed upon in writing by the parties; provided, however, that
following the approval of this Agreement by the Current Funds' Shareholders, no
such amendment may have the effect of changing the provisions for determining
the number of Successor Shares to be paid to the Current Fund Shareholders under
this Agreement to the detriment of the Current Fund Shareholders without their
further approval.
 
                                      B-11

<PAGE>
 
   
13.  HEADINGS; COUNTERPARTS; GOVERNING LAW; ASSIGNMENT
    
 
     13.1  The article and paragraph headings contained in this Agreement are
for reference purposes only and shall not affect in any way the meaning or
interpretation of this Agreement.
 
     13.2  This Agreement may be executed in any number of counterparts, each of
which shall be deemed an original.
 
     13.3  This Agreement shall be governed by and construed in accordance with
the laws of The Commonwealth of Massachusetts.
 
     13.4  This Agreement shall be binding upon and inure to the benefit of the
parties hereto and their respective successors and assigns, but no assignment or
transfer hereof or of any rights or obligations hereunder shall be made by any
party without the written consent of the other party. Nothing herein expressed
or implied is intended or shall be construed to confer upon or give any person,
firm or corporation other than the parties hereto and their respective
successors and assigns any rights or remedies under or by reason of this
Agreement.
 
     13.5  All persons dealing with the Successor Trust must look solely to the
property of the Successor Trust for the enforcement of any claims against the
Successor Trust as neither the Trustees, officers, agents nor shareholders of
the Successor Trust assume any personal liability for obligations entered into
on behalf of the Successor Trust. No other series of the of the Successor Trust
hereafter established shall be responsible for any obligations assumed by the
Successor Trust on behalf of the Successor Fund under this Agreement.
 
     13.6  A copy of the Agreement and Declaration of Trust of the Current Fund
is on file with the Secretary of State of The Commonwealth of Massachusetts, and
notice is hereby given that this instrument is executed on behalf of the
Trustees of the Current Fund as trustees and not individually and that the
obligations of this instrument are not binding upon any of the trustees,
officers, or shareholders of the Current Fund individually, but are binding only
upon the assets and property of the Current Fund.
 
   
14.  NOTICES
    
 
     Any notice, report, statement or demand required or permitted by any
provisions of this Agreement shall be in writing and shall be given by prepaid
telegraph, telecopy or certified mail addressed to the Current Fund or the
Successor Trust, each at 60 State Street, Boston, Massachusetts 02109,
Attention: Secretary.
 
                                      B-12

<PAGE>
 
     IN WITNESS WHEREOF, each of the parties hereto has caused this Agreement to
be executed by its duly authorized officer.
   
                                            PIONEER THREE
    
 
   
                                            By:
                                               -------------------------------
    
 
   
                                            Its:
                                                ------------------------------
    
   
                                              Title
    
 
   
                                            PIONEER MID-CAP FUND,
    
   
                                            a Delaware business trust,
    
   
                                            on behalf of
    
   
                                            Pioneer Mid-Cap Fund
    
 
   
                                            By:
                                               -------------------------------
    
 
   
                                            Its:
                                                ------------------------------
    
   
                                              Title
    
 
                                      B-13


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent public accountants, we hereby consent to the incorporation of our
report dated  October 27, 1995,  included in Pioneer  Mid-Cap  Fund's  (formerly
Pioneer  Three) 1995 annual report (and to all  references to our firm) included
in or made a part of  Post-Effective  Amendment  No. 20 and  Amendment No. 20 to
Registration Statement File Nos. 2-79140 and 811-3564, respectively.




                                                  /s/ARTHUR ANDERSEN LLP
                                                  ARTHUR ANDERSEN LLP




Boston, Massachusetts
November 28, 1995


                                POWER OF ATTORNEY



         I, the undersigned  trustee of Pioneer Bond Fund,  Pioneer Europe Fund,
Pioneer Fund, Pioneer Growth Trust,  Pioneer  International Growth Fund, Pioneer
Money Market Trust,  Pioneer  Municipal  Bond Fund,  Pioneer  Short-Term  Income
Trust,  Pioneer  Tax-Free  State Series  Trust,  Pioneer II,  Pioneer  Three and
Pioneer U.S.  Government Trust  (collectively,  the "Funds"),  all Massachusetts
business trusts,  do hereby constitute and appoint John F. Cogan, Jr., Joseph P.
Barri and  William H.  Keough,  and each of them acting  singly,  to be my true,
sufficient  and lawful  attorneys,  with full power to each of them, and each of
them acting  singly,  to sign for me, in my name and in the  capacity  indicated
below, any and all amendments to the Registration Statements on Forms N-1A to be
filed by the Funds under the  Investment  Company Act of 1940,  as amended,  and
under the  Securities  Act of 1933, as amended,  with respect to the offering of
the Funds' shares of beneficial  interest,  no par value,  and any and all other
documents and papers relating thereto, and generally to do all such things in my
name and on my behalf in the  capacity  indicated  to enable the Funds to comply
with the Investment  Company Act of 1940, as amended,  and the Securities Act of
1933, as amended, and all requirements of the Securities and Exchange Commission
thereunder,  hereby ratifying and confirming my signature as it may be signed by
said  attorneys or each of them to any and all  amendments to said  Registration
Statements.

         IN  WITNESS  WHEREOF,  I have  hereunder  set my hand on the  date  set
opposite my signature.



Dated: September 24, 1993                              /s/Stephen K. West
                                                       Stephen K. West
                                                       Trustee


<PAGE>
                                POWER OF ATTORNEY



         We, the  undersigned  trustees of Pioneer Money Market  Trust,  Pioneer
Bond Fund,  Pioneer U.S.  Government  Trust,  Pioneer Fund,  Pioneer II, Pioneer
Three,  Pioneer Europe Fund,  Pioneer Growth Trust,  Pioneer Municipal Bond Fund
and  Pioneer   Short-Term  Income  Trust   (collectively,   the  "Funds"),   all
Massachusetts  business trusts, do hereby severally  constitute and appoint John
F. Cogan,  Jr.,  Joseph P. Barri and William H. Keough,  and each of them acting
singly, to be our true, sufficient and lawful attorneys, with full power to each
of them, and each of them acting singly,  to sign for each of us, in the name of
each of us and in the capacities  indicated below, any and all amendments to the
Registration  Statements  on  Forms  N-1A to be  filed by the  Funds  under  the
Investment  Company Act of 1940,  as amended,  and under the  Securities  Act of
1933,  as  amended,  with  respect  to the  offering  of the  Funds'  shares  of
beneficial  interest,  no par value,  and any and all other documents and papers
relating thereto,  and generally to do all such things in the name of each of us
and on behalf of each of us in the  capacities  indicated to enable the Funds to
comply with the Investment  Company Act of 1940, as amended,  and the Securities
Act of 1933, as amended,  and all  requirements  of the  Securities and Exchange
Commission thereunder,  hereby ratifying and confirming the signature of each of
us as it may be  signed  by  said  attorneys  or  each  of  them  to any and all
amendments to said Registration Statements.

         IN WITNESS  WHEREOF,  we have  hereunder set our hands on the dates set
opposite our respective signatures.



Dated: February 5, 1993                     /s/Richard H. Egdahl, M.D.
                                            --------------------------
                                            Richard H. Egdahl, M.D.
                                            Trustee


Dated: February 5, 1993                     /s/Margaret B. W. Graham
                                            ------------------------
                                            Margaret B. W. Graham
                                            Trustee



<PAGE>


                                POWER OF ATTORNEY

         I,  William H. Keough,  the  Treasurer  and  Principal  Accounting  and
Financial Officer of Pioneer Fund, Pioneer II, Pioneer Three, Pioneer Bond Fund,
Pioneer  Municipal Bond Fund,  Pioneer U.S.  Government  Trust and Pioneer Money
Market Trust (collectively, the "Funds"), hereby constitute and apoint Joseph P.
Barri my true and lawful  attorney  with full power to him to sign for me and in
my name and in the capacities  listed above the Registration  Statements on Form
N-1A for each of the Funds  and any and all  post-effective  amendments  to said
Registration Statements,  including the post-effective amendment filed herewith,
and  generally  to do all such things in my name and on my behalf in my capacity
as an officer of the Funds to enable the Funds to comply with the  provisions of
the Securities Act of 1933, as amended,  the Investment  Company Act of 1940, as
amended, and all requirements of the Securities and Exchange Commission.

         Witness my hand on the date set forth below.



Date January 24, 1990                             /s/ William H. Keough
- ----------------------------------                ---------------------
                                                  William H. Keough
Subscribed and sworn to
before me this 24th day of
January, 1990.




Notary Public

My commission expires: August 3, 1990




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