PIONEER FUND /MA/
485BPOS, 1996-05-01
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                                                               File Nos. 2-25980
                                                                        811-1466

        As Filed with The Securities and Exchange Commission May 1, 1996

                       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. 63                      /_X__/
    

                                     and/or

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

   
               Amendment No. 29                                     /_X _/
    

                        (Check appropriate box or boxes)

                                  PIONEER FUND

               (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 May 1, 1996 pursuant to paragraph (b) 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
December 31, 1995 on February 28, 1996.



<PAGE>
                         INCORPORATION BY REFERENCE PAGE



         The  cross-reference   sheet,   prospectus,   statement  of  additional
information and Part C filed with the Securities and Exchange Commission as part
of   post-effective   amendment  no.  62  (amendment  no.  28)  to  Registrant's
Registration   Statement  on  Form  N-1A  (File  Nos.  2-25980;   811-1466)  are
incorporated herein by reference. The financial statements of the Registrant for
the fiscal year ended December 31, 1995 required to be included in Part B of the
Registration  Statement  by Item 23 of Form  N-1A  are  incorporated  herein  by
reference from the Annual Report to Shareholders  dated December 31, 1995 (filed
electronically February 28, 1996, File No. 811-1466;0000078758-96-000002).


<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. 63 to
its Registration  Statement  pursuant to Rule 485(b) under the Securities Act of
1933  and  has  duly  caused  this  Post-Effective  Amendment  No.  63  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 May, 1996.
    


                                  PIONEER FUND



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


         Pursuant  to the  requirements  of the  Securities  Act of  1933,  this
Post-Effective  Amendment No. 63 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              )
John F. Cogan, Jr                                 (Principal Executive       )
                                                  Officer)                   )
                                                                             )
                                                                             )
William H. Keough*                                Chief Financial Officer    )
William H. Keough                                 and Treasurer (Principal   )
                                                  Financial and Accounting   )
                                                  Officer)                   )
Trustees:                                                                    )
                                                                             )
                                                                             )
John F. Cogan, Jr.                                                           )
John F. Cogan, Jr                                                            )


<PAGE>

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



   
*By:/S/John F. Cogan, Jr.                        Dated:  May 1, 1996
    John F. Cogan, Jr.
    Attorney-in-fact
    



<PAGE>


                                  Exhibit Index


Exhibit
Number   Document Title


   
4.1  Specimen Class A Share Certificate

4.2  Specimen Class B Share Certificate

4.3  Specimen Class C Share Certificate
    

10.  Legal Opinion of Morris, Nichols, Arsht & Tunnell

11.  Consent of Arthur Andersen LLP




   
                                   PIONEER FUND

                                 CLASS A SHARES

                     ORGANIZED AS A BUSINESS TRUST UNDER THE
                          LAWS OF THE STATE OF DELAWARE



                                        SEE REVERSE SIDE FOR CERTAIN DEFINITIONS



This is to certify that



                                                                 is the owner of



FULLY PAID AND NON-ASSESSABLE SHARES OF BENEFICIAL INTEREST,  WITHOUT PAR VALUE,
OF THE TRUST OR SERIES OF THE TRUST IDENTIFIED ABOVE.

transferable  only on the books of the Trust, by the holder hereof, in person or
by  duly  authorized  attorney,  upon  surrender  of this  Certificate  properly
endorsed.  The aforesaid holder is entitled to require the Trust to purchase all
or any part of the Shares represented by this Certificate at net asset value, as
more fully set forth on the reverse of this Certificate. This Certificate is not
valid until countersigned by the Transfer Agent.

         IN WITNESS  WHEREOF,  the said Trust has caused this  Certificate to be
signed by its duly authorized officers and its seal to be hereunto affixed.

Dated:


                                                 Countersigned:

                                                 PIONEERING SERVICES CORPORATION
                                                 Transfer Agent



                                                 Authorized Officer


Treasurer                                        President



<PAGE>


                                     REVERSE


         THE  REGISTERED  HOLDER  OF THIS  CERTIFICATE  IS  ENTITLED  TO ALL THE
RIGHTS,  INTEREST AND PRIVILEGES OF A SHAREHOLDER AS PROVIDED BY THE ARTICLES OF
INCORPORATION  AND BY-LAWS OF THE FUND, AS AMENDED,  WHICH ARE  INCORPORATED  BY
REFERENCE HEREIN. IN PARTICULAR,  THE SHARES REPRESENTED BY THIS CERTIFICATE ARE
TRANSFERABLE BY THE HOLDER,  IN PERSON OR BY HIS DULY AUTHORIZED  ATTORNEY,  BUT
ONLY ON SURRENDER OF THIS CERTIFICATE PROPERLY ENDORSED AND WHEN THE TRANSFER IS
MADE ON THE BOOKS OF THE FUND.

         THE  HOLDER  OF THIS  CERTIFICATE,  AS  PROVIDED  IN SAID  ARTICLES  OF
INCORPORATION  AND  BY-LAWS,  AS  AMENDED,  SHALL NOT IN ANY WISE BE  PERSONALLY
LIABLE FOR ANY DEBT, OBLIGATION OR ACT OF THE FUND.

         ANY  SHAREHOLDER  DESIRING  TO DISPOSE OF HIS  SHARES MAY  DEPOSIT  HIS
CERTIFICATE,  DULY ENDORSED IN BLANK OR ACCOMPANIED BY AN INSTRUMENT OF TRANSFER
EXECUTED  IN BLANK,  AT THE OFFICE OF  PIONEERING  SERVICES  CORPORATION  OR ANY
SUCCESSOR  TRANSFER  AGENT OF THE FUND,  TOGETHER WITH AN  IRREVOCABLE  OFFER IN
WRITING TO SELL THE SHARES  REPRESENTED  THEREBY AT THE NET ASSET VALUE  THEREOF
AND THE FUND WILL  THEREAFTER  PURCHASE SAID SHARES FOR CASH AT NET ASSET VALUE.
THE COMPUTATION OF NET ASSET VALUE, THE LIMITATIONS UPON THE DATE OF PAYMENT AND
PROVISIONS  DEALING WITH  SUSPENSION  OF THIS RIGHT IN CERTAIN  EMERGENCIES  ARE
FULLY DESCRIBED IN SAID ARTICLES OF INCORPORATION AND BY-LAWS, AS AMENDED.

         NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME
AS  WRITTEN  UPON  THE FACE OF THE  CERTIFICATE  IN  EVERY  PARTICULAR,  WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

         SIGNATURES  MUST BE  GUARANTEED  IN  ACCORDANCE  WITH THE THEN  CURRENT
PROSPECTUS OF THE FUND.

         The following  abbreviations,  when used in the inscription on the face
of this certificate,  shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM -- as tenants in common
TEN ENT -- as tenants by the entireties
JT TEN -- as joint tenants with rights of survivorship UGMA/"state abbreviation"
- -- Uniform Gifts to Minors UTMA/"state  abbreviation/age" -- Uniform Transfer to
Minors

Additional abbreviations that do not appear in the above list may also be used.



<PAGE>


     For Value Received, ______________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR
OTHER IDENTIFYING NUMBER OF ASSIGNEE

|                                               |
|                                               |


  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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

Shares  represented  by  the  within  Certificate,  and  do  hereby  irrevocably
constitute and appoint

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

Attorney to transfer  the said shares on the books of the within named Fund with
full power of substitution in the premises.

         Dated,

                                               ---------------------------------
                                                             Owner

                                               ---------------------------------
                                                 Signature of Co-Owner, if any

IMPORTANT: BEFORE SIGNING, READ AND COMPLY CAREFULLY WITH NOTICE PRINTED ABOVE.

Signature(s) guaranteed by:

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


    

                                  PIONEER FUND

                                 CLASS B SHARES

                     ORGANIZED AS A BUSINESS TRUST UNDER THE
                          LAWS OF THE STATE OF DELAWARE



                                        SEE REVERSE SIDE FOR CERTAIN DEFINITIONS



This is to certify that



                                                                 is the owner of



FULLY PAID AND NON-ASSESSABLE SHARES OF BENEFICIAL INTEREST,  WITHOUT PAR VALUE,
OF THE TRUST OR SERIES OF THE TRUST IDENTIFIED ABOVE.

transferable  only on the books of the Trust, by the holder hereof, in person or
by  duly  authorized  attorney,  upon  surrender  of this  Certificate  properly
endorsed.  The aforesaid holder is entitled to require the Trust to purchase all
or any part of the Shares represented by this Certificate at net asset value, as
more fully set forth on the reverse of this Certificate. This Certificate is not
valid until countersigned by the Transfer Agent.

         IN WITNESS  WHEREOF,  the said Trust has caused this  Certificate to be
signed by its duly authorized officers and its seal to be hereunto affixed.

Dated:


                                                 Countersigned:

                                                 PIONEERING SERVICES CORPORATION
                                                 Transfer Agent



                                                 Authorized Officer


Treasurer                                        President



<PAGE>


                                     REVERSE


         THE  REGISTERED  HOLDER  OF THIS  CERTIFICATE  IS  ENTITLED  TO ALL THE
RIGHTS,  INTEREST AND PRIVILEGES OF A SHAREHOLDER AS PROVIDED BY THE ARTICLES OF
INCORPORATION  AND BY-LAWS OF THE FUND, AS AMENDED,  WHICH ARE  INCORPORATED  BY
REFERENCE HEREIN. IN PARTICULAR,  THE SHARES REPRESENTED BY THIS CERTIFICATE ARE
TRANSFERABLE BY THE HOLDER,  IN PERSON OR BY HIS DULY AUTHORIZED  ATTORNEY,  BUT
ONLY ON SURRENDER OF THIS CERTIFICATE PROPERLY ENDORSED AND WHEN THE TRANSFER IS
MADE ON THE BOOKS OF THE FUND.

         THE  HOLDER  OF THIS  CERTIFICATE,  AS  PROVIDED  IN SAID  ARTICLES  OF
INCORPORATION  AND  BY-LAWS,  AS  AMENDED,  SHALL NOT IN ANY WISE BE  PERSONALLY
LIABLE FOR ANY DEBT, OBLIGATION OR ACT OF THE FUND.

         ANY  SHAREHOLDER  DESIRING  TO DISPOSE OF HIS  SHARES MAY  DEPOSIT  HIS
CERTIFICATE,  DULY ENDORSED IN BLANK OR ACCOMPANIED BY AN INSTRUMENT OF TRANSFER
EXECUTED  IN BLANK,  AT THE OFFICE OF  PIONEERING  SERVICES  CORPORATION  OR ANY
SUCCESSOR  TRANSFER  AGENT OF THE FUND,  TOGETHER WITH AN  IRREVOCABLE  OFFER IN
WRITING TO SELL THE SHARES  REPRESENTED  THEREBY AT THE NET ASSET VALUE  THEREOF
AND THE FUND WILL  THEREAFTER  PURCHASE SAID SHARES FOR CASH AT NET ASSET VALUE.
THE COMPUTATION OF NET ASSET VALUE, THE LIMITATIONS UPON THE DATE OF PAYMENT AND
PROVISIONS  DEALING WITH  SUSPENSION  OF THIS RIGHT IN CERTAIN  EMERGENCIES  ARE
FULLY DESCRIBED IN SAID ARTICLES OF INCORPORATION AND BY-LAWS, AS AMENDED.

         NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME
AS  WRITTEN  UPON  THE FACE OF THE  CERTIFICATE  IN  EVERY  PARTICULAR,  WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

         SIGNATURES  MUST BE  GUARANTEED  IN  ACCORDANCE  WITH THE THEN  CURRENT
PROSPECTUS OF THE FUND.

         The following  abbreviations,  when used in the inscription on the face
of this certificate,  shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM -- as tenants in common
TEN ENT -- as tenants by the entireties
JT TEN -- as joint tenants with rights of survivorship UGMA/"state abbreviation"
- -- Uniform Gifts to Minors UTMA/"state  abbreviation/age" -- Uniform Transfer to
Minors

Additional abbreviations that do not appear in the above list may also be used.



<PAGE>


     For Value Received, ______________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR
OTHER IDENTIFYING NUMBER OF ASSIGNEE

|                                               |
|                                               |


  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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

Shares  represented  by  the  within  Certificate,  and  do  hereby  irrevocably
constitute and appoint

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

Attorney to transfer  the said shares on the books of the within named Fund with
full power of substitution in the premises.

         Dated,

                                               ---------------------------------
                                                             Owner

                                               ---------------------------------
                                                 Signature of Co-Owner, if any

IMPORTANT: BEFORE SIGNING, READ AND COMPLY CAREFULLY WITH NOTICE PRINTED ABOVE.

Signature(s) guaranteed by:

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


                                  PIONEER FUND

                                 CLASS C SHARES

                     ORGANIZED AS A BUSINESS TRUST UNDER THE
                          LAWS OF THE STATE OF DELAWARE



                                        SEE REVERSE SIDE FOR CERTAIN DEFINITIONS



This is to certify that



                                                                 is the owner of



FULLY PAID AND NON-ASSESSABLE SHARES OF BENEFICIAL INTEREST,  WITHOUT PAR VALUE,
OF THE TRUST OR SERIES OF THE TRUST IDENTIFIED ABOVE.

transferable  only on the books of the Trust, by the holder hereof, in person or
by  duly  authorized  attorney,  upon  surrender  of this  Certificate  properly
endorsed.  The aforesaid holder is entitled to require the Trust to purchase all
or any part of the Shares represented by this Certificate at net asset value, as
more fully set forth on the reverse of this Certificate. This Certificate is not
valid until countersigned by the Transfer Agent.

         IN WITNESS  WHEREOF,  the said Trust has caused this  Certificate to be
signed by its duly authorized officers and its seal to be hereunto affixed.

Dated:


                                                 Countersigned:

                                                 PIONEERING SERVICES CORPORATION
                                                 Transfer Agent



                                                 Authorized Officer


Treasurer                                        President



<PAGE>


                                     REVERSE


         THE  REGISTERED  HOLDER  OF THIS  CERTIFICATE  IS  ENTITLED  TO ALL THE
RIGHTS,  INTEREST AND PRIVILEGES OF A SHAREHOLDER AS PROVIDED BY THE ARTICLES OF
INCORPORATION  AND BY-LAWS OF THE FUND, AS AMENDED,  WHICH ARE  INCORPORATED  BY
REFERENCE HEREIN. IN PARTICULAR,  THE SHARES REPRESENTED BY THIS CERTIFICATE ARE
TRANSFERABLE BY THE HOLDER,  IN PERSON OR BY HIS DULY AUTHORIZED  ATTORNEY,  BUT
ONLY ON SURRENDER OF THIS CERTIFICATE PROPERLY ENDORSED AND WHEN THE TRANSFER IS
MADE ON THE BOOKS OF THE FUND.

         THE  HOLDER  OF THIS  CERTIFICATE,  AS  PROVIDED  IN SAID  ARTICLES  OF
INCORPORATION  AND  BY-LAWS,  AS  AMENDED,  SHALL NOT IN ANY WISE BE  PERSONALLY
LIABLE FOR ANY DEBT, OBLIGATION OR ACT OF THE FUND.

         ANY  SHAREHOLDER  DESIRING  TO DISPOSE OF HIS  SHARES MAY  DEPOSIT  HIS
CERTIFICATE,  DULY ENDORSED IN BLANK OR ACCOMPANIED BY AN INSTRUMENT OF TRANSFER
EXECUTED  IN BLANK,  AT THE OFFICE OF  PIONEERING  SERVICES  CORPORATION  OR ANY
SUCCESSOR  TRANSFER  AGENT OF THE FUND,  TOGETHER WITH AN  IRREVOCABLE  OFFER IN
WRITING TO SELL THE SHARES  REPRESENTED  THEREBY AT THE NET ASSET VALUE  THEREOF
AND THE FUND WILL  THEREAFTER  PURCHASE SAID SHARES FOR CASH AT NET ASSET VALUE.
THE COMPUTATION OF NET ASSET VALUE, THE LIMITATIONS UPON THE DATE OF PAYMENT AND
PROVISIONS  DEALING WITH  SUSPENSION  OF THIS RIGHT IN CERTAIN  EMERGENCIES  ARE
FULLY DESCRIBED IN SAID ARTICLES OF INCORPORATION AND BY-LAWS, AS AMENDED.

         NOTICE:  THE SIGNATURE TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME
AS  WRITTEN  UPON  THE FACE OF THE  CERTIFICATE  IN  EVERY  PARTICULAR,  WITHOUT
ALTERATION OR ENLARGEMENT OR ANY CHANGE WHATEVER.

         SIGNATURES  MUST BE  GUARANTEED  IN  ACCORDANCE  WITH THE THEN  CURRENT
PROSPECTUS OF THE FUND.

         The following  abbreviations,  when used in the inscription on the face
of this certificate,  shall be construed as though they were written out in full
according to applicable laws or regulations:

TEN COM -- as tenants in common
TEN ENT -- as tenants by the entireties
JT TEN -- as joint tenants with rights of survivorship UGMA/"state abbreviation"
- -- Uniform Gifts to Minors UTMA/"state  abbreviation/age" -- Uniform Transfer to
Minors

Additional abbreviations that do not appear in the above list may also be used.



<PAGE>


     For Value Received, ______________________ hereby sell, assign and transfer
unto

PLEASE INSERT SOCIAL SECURITY OR
OTHER IDENTIFYING NUMBER OF ASSIGNEE

|                                               |
|                                               |


  (PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

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

Shares  represented  by  the  within  Certificate,  and  do  hereby  irrevocably
constitute and appoint

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

Attorney to transfer  the said shares on the books of the within named Fund with
full power of substitution in the premises.

         Dated,

                                               ---------------------------------
                                                             Owner

                                               ---------------------------------
                                                 Signature of Co-Owner, if any

IMPORTANT: BEFORE SIGNING, READ AND COMPLY CAREFULLY WITH NOTICE PRINTED ABOVE.

Signature(s) guaranteed by:

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





                                             April 29, 1996






Pioneer Fund
60 State Street
Boston, Massachusetts  02109

           Re:    Pioneer Fund

Ladies and Gentlemen:

                  We have acted as special  Delaware  counsel to Pioneer Fund, a
Delaware  business  trust (the  "Trust"),  in  connection  with certain  matters
relating to the  formation of the Trust and the issuance of Shares of beneficial
interest in the Trust.  Capitalized  terms used herein and not otherwise  herein
defined are used as defined in the  Agreement  and  Declaration  of Trust of the
Trust dated April 2, 1996 (the "Governing Instrument").

                  In rendering  this  opinion,  we have  examined  copies of the
following  documents,  each in the form provided to us: the Certificate of Trust
of the Trust as filed in the  Office of the  Secretary  of State of the State of
Delaware  (the  "Recording  Office") on April 8, 1996 (the  "Certificate");  the
Governing  Instrument;  the  By-laws of the Trust;  certain  resolutions  of the
Trustees  of  the  Trust;  an  Adoption  Of And  Amendment  To  Notification  Of
Registration to be filed with the Securities and Exchange Commission on or about
May 1, 1996 by which the Trust will adopt the Notification of Registration Filed
Pursuant to Section 8(a) of the  Investment  Company Act of 1940 on Form N-8A of
Pioneer Fund, a Massachusetts business trust; Post-Effective Amendment No. 62 to
the  Registration  Statement  under The  Securities  Act of 1933 on Form N-1A of
Pioneer Fund, a Massachusetts business trust, by which the Trust will adopt such
Registration  Statement to be filed with the Securities and Exchange  Commission
on or about May 1, 1996 (the "Post-Effective Amendment"); and a certification of
good  standing  of the Trust  obtained  as of a recent  date from the  Recording
Office. In such examinations, we have assumed the genuineness of all signatures,
the conformity to original documents of all documents  submitted to us as copies
or drafts of documents to be executed, and the legal capacity of natural persons
to complete the execution of documents.  We have further assumed for the purpose
of this  opinion:  (i) the due  authorization,  execution and delivery by, or on
behalf of,  each of the  parties  thereto of the  above-referenced  instruments,
certificates  and other  documents,  and of all  documents  contemplated  by the
Governing Instrument,  the By-laws and applicable resolutions of the Trustees to
be executed by investors  desiring to become  Shareholders;  (ii) the payment of
<PAGE>
Pioneer Fund
April 29, 1996
Page 2

consideration for Shares, and the application of such consideration, as provided
in the Governing Instrument, and compliance with the other terms, conditions and
restrictions   set  forth  in  the  Governing   Instrument  and  all  applicable
resolutions  of the  Trustees of the Trust in  connection  with the  issuance of
Shares (including,  without limitation,  the taking of all appropriate action by
the  Trustees  to  designate  Series of Shares and the  rights  and  preferences
attributable  thereto as contemplated by the Governing  Instrument);  (iii) that
appropriate  notation of the names and  addresses  of, the number of Shares held
by,  and the  consideration  paid by,  Shareholders  will be  maintained  in the
appropriate  registers  and other books and  records of the Trust in  connection
with the  issuance,  redemption  or transfer  of Shares;  (iv) that no event has
occurred  subsequent  to the  filing  of the  Certificate  that  would  cause  a
termination  or  reorganization  of the Trust  under  Section 4 or  Section 5 of
Article IX of the  Governing  Instrument;  (v) that the  activities of the Trust
have been and will be conducted in  accordance  with the terms of the  Governing
Instrument and the Delaware  Business Trust Act, 12 Del. C. ss.ss.  3801 et seq.
(the "Delaware Act");  and (vi) that each of the documents  examined by us is in
full force and  effect  and has not been  modified,  supplemented  or  otherwise
amended,  except as herein  referenced.  No opinion  is  expressed  herein  with
respect to the requirements of, or compliance with,  federal or state securities
or blue sky laws.  Further, we express no opinion on the sufficiency or accuracy
of any  registration  or  offering  documentation  relating  to the Trust or the
Shares.  As to any facts material to our opinion,  other than those assumed,  we
have relied without independent investigation on the above-referenced  documents
and on the accuracy, as of the date hereof, of the matters therein contained.


<PAGE>
Pioneer Fund
April 29, 1996
Page 3



                  Based on and  subject  to the  foregoing,  and  limited in all
respects to matters of Delaware law, it is our opinion that:

                  1. The Trust is a duly organized and validly existing business
trust in good standing under the laws of the State of Delaware.

                  2. The Shares,  when issued to Shareholders in accordance with
the terms,  conditions,  requirements  and procedures set forth in the Governing
Instrument, will constitute legally issued, fully paid and non-assessable Shares
of beneficial interest in the Trust.


<PAGE>

Pioneer Fund
April 29, 1996
Page 4







                  3.  Under  the  Delaware  Act and the  terms of the  Governing
Instrument, each Shareholder of the Trust, in such capacity, will be entitled to
the same  limitation of personal  liability as that extended to  stockholders of
private  corporations for profit organized under the general  corporation law of
the State of  Delaware;  provided,  however,  that we express  no  opinion  with
respect to the  liability of any  Shareholder  who is, was or may become a named
Trustee of the Trust.  Neither the  existence  nor exercise of the voting rights
granted to Shareholders under the Governing  Instrument will, of itself, cause a
Shareholder  to be  deemed a  trustee  of the  Trust  under  the  Delaware  Act.
Notwithstanding  the foregoing or the opinion expressed in paragraph 2 above, we
note that,  pursuant to Section 2 of Article VIII of the  Governing  Instrument,
the  Trustees  have the  power  to  cause  Shareholders,  or  Shareholders  of a
particular  Series,  to pay certain  custodian,  transfer,  servicing or similar
agent charges by setting off the same against  declared but unpaid  dividends or
by reducing Share ownership (or by both means).

                  We  understand  that  you  are  currently  in the  process  of
registering or qualifying Shares in the various states, and we hereby consent to
the filing of a copy of this opinion with the Securities and Exchange Commission
as part of the Post-Effective  Amendment and with the securities  administrators
of such states.  In giving this  consent,  we do not thereby  admit that we come
within the category of persons whose consent is required  under Section 7 of the
Securities  Act of  1933,  as  amended,  or the  rules  and  regulations  of the
Securities  and  Exchange  Commission  thereunder.  Except as  provided  in this
paragraph,  the opinion set forth above is  expressed  solely for the benefit of
the  addressee  hereof and may not be relied upon by, or filed  with,  any other
person or entity for any purpose without our prior written consent.

                                          Sincerely,

                                          /s/MORRIS, NICHOLS, ARSHT & TUNNELL
                                          MORRIS, NICHOLS, ARSHT & TUNNELL


                    CONSENT OF INDEPENDENT PUBLIC ACCOUNTANTS



As independent  public  accountants,  we hereby consent to the use of our report
dated February 2, 1996 included in Pioneer Fund's 1995 Annual Report (and to all
references  to  our  firm)  included  in or  made a part  of  the  Pioneer  Fund
Post-Effective  Amendment No. 63 to Registration  Statement File No. 2-25980 and
Amendment No. 29 to Registration File No. 811-1466.




                                                  /S/ARTHUR ANDERSEN LLP
                                                  ARTHUR ANDERSEN LLP




Boston, Massachusetts
May 1, 1996




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