OPPENHEIMER MIDCAP FUND
497, 1998-03-10
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                             OPPENHEIMER MIDCAP FUND
                     Supplement dated March 16, 1998 to the
                       Prospectus dated November 17, 1997

The Prospectus is changes as follows:

1.    The Supplement dated November 17, 1997 to the Prospectus is replaced by
this
supplement.

2. The section  captioned "Who Manages The Fund?" under "A Brief Overview of the
Fund" should be revised to read as follows:

      o Who  Manages  The Fund?  The Manager is  OppenheimerFunds,  Inc.,  which
(including subsidiaries) manages investment companies having over $75 billion in
assets as of December 31, 1997. The Manager is paid an advisory fee by the Fund,
based on its net assets.  The Fund has a portfolio  manager,  Mr. Jay W. Tracey,
III,  who is  employed  by the  Manager  and is  primarily  responsible  for the
selection of the Fund's  securities.  The Fund's  Board of Trustees,  elected by
shareholders,  oversees the investment adviser and the portfolio manager. Please
refer to "How the Fund is  Managed,"  starting  on page 14 for more  information
about the Manager and its fees.

3. The section  captioned  "Portfolio  Manager"  under "How the Fund is Managed"
should be revised to read as follows:

      o Portfolio  Manager.  The Portfolio Manager of the Fund is Jay W. Tracey,
III. He became the person principally  responsible for the day-to-day management
of the Fund's portfolio on March 16, 1998. Mr. Tracey is a Vice President of the
Manager  and has served as an officer of other  Oppenheimer  funds from  October
1991 to February 1994,  and since  September  1994. In his most recent  previous
position, Mr. Tracey was a managing director of Buckingham Capital Management.

4. The following paragraph should be added as the third paragraph in the section
captioned "The Manager and Its Affiliates" under "How the Fund is Managed:"

      The  management  services  provided  to the Fund by the  Manager,  and the
services  provided by the  Distributor  and the Transfer Agent to  shareholders,
depend on the  smooth  functioning  of their  computer  systems.  Many  computer
software  systems in use today  cannot  distinguish  the year 2000 from the year
1900 because of the way dates are encoded and  calculated.  That  failure  could
have a negative  impact on  handling  securities  trades,  pricing  and  account
services.  The Manager,  the  Distributor  and Transfer Agent have been actively
working on  necessary  changes to their  computer  systems to deal with the year
2000 and expect  that  their  systems  will be  adapted in time for that  event,
although there cannot be assurance of success.

5.    The section captioned "At What Price Are Shares Sold?" under "How to
Buy Shares"


<PAGE>



should be revised to read as follows:

      o At What Price Are Shares  Sold?  Shares are sold at the public  offering
price based on the net asset value (and any initial  sales charge that  applies)
that is next  determined  after the  Distributor  receives the purchase order in
Denver, Colorado, or the order is received and transmitted to the Distributor by
an entity  authorized by the Fund to accept purchase or redemption  orders.  The
Fund has  authorized  the  Distributor,  certain  broker-dealers  and  agents or
intermediaries  designated by the Distributor or those  broker-dealers to accept
orders.  In most cases, to enable you to receive that day's offering price,  the
Distributor  or an authorized  entity must receive your order by the time of day
The New York Stock Exchange closes,  which is normally 4:00 P.M., New York time,
but may be earlier on some days (all  references to time in this Prospectus mean
"New York time").  The net asset value of each class of shares is  determined as
of that  time on each  day The New  York  Stock  Exchange  is open  (which  is a
"regular business day"). If you buy shares through a dealer, normally your order
must  be  transmitted  to the  Distributor  so that it is  received  before  the
Distributor's  close of  business  that day,  which is  normally  5:00 P.M.  The
Distributor,  in its sole  discretion,  may  reject any  purchase  order for the
Fund's shares.

6. The fourth  bullet point under  "Waivers of the Class A  Contingent  Deferred
Sales  Charge for  Certain  Redemptions"  in  Waivers of Class A Sales  Charges"
should be revised to read as follows:

      o if, at the time of purchase (if purchased  during the period May 1, 1997
through  December 31, 1997), the dealer agreed in writing to accept the dealer's
portion of the sales  commission in installments of 1/12th of the commission per
month (and no  further  commission  will be  payable if the shares are  redeemed
within 12 months of purchase);

7. The last sentence in the first paragraph under the section  captioned "Buying
Class B Shares" under "About Your Account" should be revised to read as follows:
"The
Class B
contingent  deferred sales charge is paid to compensate the  Distributor for its
expenses of providing  distribution-related  services to the Fund in  connection
with the sale of Class B shares.

8.  The last  sentence  in the  fifth  paragraph  under  the  section  captioned
"Distribution  and  Service  Plans for  Class B and  Class C  Shares"  should be
revised to read as follows: "The Distributor may pay the Class B service fee and
the asset-based sales charge to the dealer quarterly in lieu of paying the sales
commission and service fee advance at the time of purchase."

9.  The last  sentence  in the  sixth  paragraph  under  the  section  captioned
"Distribution  and  Service  Plans for  Class B and  Class C  Shares"  should be
revised to read as follows: "The Distributor may pay the Class C service fee and
asset-based  sales  charge to the dealer  quarterly  in lieu of paying the sales
commission and service fee advance at the time of purchase."

10. The first  sub-paragraph  under "Retirement  Plans" in the section captioned
"Special Investor Services" should be revised to read as follows:  "o Individual
Retirement Accounts


<PAGE>


including rollover IRAs, for individuals and their spouses and SIMPLE IRAs
offered by
employers"

11. The section  captioned  "Buying Shares Through the  Distributor"  under "How
Much Must You Invest" should be revised to read as follows:

      o Buying Shares Through the Distributor.  Complete an OppenheimerFunds New
Account  Application  and return it with a check  payable  to  "OppenheimerFunds
Distributor,  Inc." Mail it to P.O. Box 5270,  Denver,  Colorado  80217.  If you
don't list a dealer on the  application,  the Distributor will act as your agent
in  buying  the  shares.  However,  it is  recommended  that  you  discuss  your
investment first with a financial advisor, to be sure that it is appropriate for
you.
      o Payments by Federal Funds Wire. Shares may be purchased by Federal Funds
wire. The minimum  investment is $2,500.  You must first call the  Distributor's
Wire  Department at  1-800-525-7041  to notify the  Distributor  of the wire and
receive further instructions.

12. The following  should be added to the section  captioned  "Special  Investor
Services," after
"Shareholder Transactions by Fax:"

OppenheimerFunds  Internet Web Site.  Information about the Fund, including your
account balance, daily share prices, market and Fund portfolio information,  may
be obtained by visiting the OppenheimerFunds Internet Web Site, at the following
Internet address:  http://www.oppenheimerfunds.com.  In 1998, the Transfer Agent
anticipates offering certain account transactions through the Internet Web Site.
To find out more information  about those  transactions  and procedures,  please
visit the Web Site.

13. The section captioned "Backup  Withholding" under "Shareholder Account Rules
and Policies" should be revised to read as follows:

      o "Backup Withholding" of Federal income tax may be applied at the rate of
31% from taxable  dividends,  distributions and redemption  proceeds  (including
exchanges)  if you fail to furnish  the Fund a correct  and  properly  certified
Social   Security  or  Employer   Identification   Number  when  you  sign  your
application, or if you underreport your income to the Internal Revenue Service.

14. The section captioned  "Buying a Dividend" under  "Dividends,  Capital Gains
and Taxes--Taxes" should be revised to read as follows:

      o "Buying a Dividend": If you buy shares on or just before the ex-dividend
date, or just before the Fund declares a capital  gains  distribution,  you will
pay the full price for the  shares and then  receive a portion of the price back
as a taxable dividend or capital gain, respectively.

March 16, 1998                                                    PS0745.002
<PAGE>
                        OPPENHEIMER MIDCAP FUND
                    Supplement   dated  March  16,  1998  to  the  Statement  of
   Additional Information dated November 17, 1997

      The Statement of Additional Information is amended as follows:

1. The following  paragraph should replace the biographical data of Paul LaRocco
which appears under the section "How the Fund Is Managed--Trustees and
Officers of the Fund," on page 20:

Jay W. Tracey, III, Vice President and Portfolio Manager; Age: 44 Vice President
of the Manager (since September 1994);  Vice President and portfolio  manager of
other  OppenheimerFunds;  formerly a Managing  Director  of  Buckingham  Capital
Management  (February  1994-September  1994),  prior to  which he was  Portfolio
Manager and Vice  President of the Fund and other  Oppenheimer  funds and a Vice
President of the Manager (July 1991-February 1994).

2. The  section  captioned  "Portfolio  Management"  under "The  Manager and Its
Affiliates" should be revised to read as follows:

      |X|  Portfolio  Management.  The  Portfolio  Manager  of the
Fund is Jay W.
Tracey,  III, who became the person  principally  responsible  for
the day-to-day
management  of  the  Fund's  portfolio  on  March  16,  1998.  Mr.
Tracey's background
is described in the Prospectus  under  "Portfolio  Manager." Other
members of the
Manager's  Equity  Portfolio   Department  provide  the  Portfolio
Manager with counsel
and support in managing the Fund's portfolio.



March 16, 1998                                                PX0745.001




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