PROFESSIONALLY MANAGED PORTFOLIOS
497, 1996-03-08
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                               The Osterweis Fund
                  Supplement to Prospectus dated August 1, 1995

The disclosure  under the caption "How to Invest in the Fund" and "How to Redeem
an  Investment  in the Fund" in the Fund's  prospectus  dated  August 1, 1995 is
supplemented  by the  following  information.  Shareholders  should review those
portions of the prospectus  for a complete  discussion  regarding  purchases and
redemptions of fund shares.

Effective  March 8, 1996,  Star Bank,  N.A., 425 Walnut Street,  Cincinnati,  OH
45202 will serve as Custodian of the Fund's assets and American  Data  Services,
Inc., 24 West Carver St., Huntington, NY 11743 will serve as the Fund's Transfer
and Shareholder Service Agent.

Shareholders should direct correspondence and inquiries as follows:

INVESTMENTS

BY MAIL:  Initial and  subsequent  investments  should be sent to The  Osterweis
Fund, P.O. Box 856, Cincinnati, OH 45264-0856.

BY WIRE: It is necessary to notify the Fund prior to each wire  purchase.  Wires
sent without  notifying the Fund will result in a delay of the effective date of
your purchase.

Shareholders should instruct their bank to wire funds as follows:

Star Bank, N.A.  Cinti/Trust
ABA #0420-0001-3
Attn: The Osterweis Fund
DDA # 483898003
Account name (shareholder name)
Shareholder account number

BY COURIER:  All investments  sent by overnight or other courier services should
be sent toThe  Osterweis  Fund, c/o Star Bank,  N.A., 425 Walnut Street,  Mutual
Fund Custody Dept. M.L. 6118, Cincinnati, OH 45202.

REDEMPTIONS:

DIRECT  REDEMPTION:  Requests for  redemption of fund shares should be mailed to
The Osterweis Fund, 24 West Carver St., Huntington, NY 11743.

TELEPHONE REDEMPTION:  If you have completed the Redemption by Telephone portion
of the Fund's account  application you may redeem shares on any business day the
New York Stock Exchange is open by calling the Transfer Agent at  1-800-385-7003
before 4:00 p.m. Eastern time.

All other shareholder account questions should be directed to 1-800-385-7003.

The disclosure  under the caption  "Management of the Fund" in the Prospectus is
revised as follows:

Effective March 8, 1996, Investment Company Administration  Corporation ("ICAC")
will act as the Fund's Administrative Manager under substantially the same terms
and  conditions  as  in  the  previous  management  agreement  with  Southampton
Investment  Management  Company.  ICAC and  Southampton  have the same officers,
directors and  employees.  Under the current  arrangement  with  Southampton,  a
monthly  fee is paid at the  annual  rate of  0.25% of  average  net  assets  or
$30,000, whichever is greater. Under the agreement with ICAC, a monthly fee will
be paid by the Fund to ICAC at the following annual rate:

Average net assets of each Fund             Fee or fee rate
- -------------------------------             ---------------
Under $15 million                           $30,000
$15 to $50 million                          0.20% of average net assets
$50 to $100 million                         0.15% of average net assets
$100 million to $150 million                0.10% of average net assets
Over $150 million                           0.05% of average net assets


March 8, 1996

<PAGE>
                                       THE
                                    OSTERWEIS
                                      FUND
                         ------------------------------
                         One Maritime Plaza, Suite 1201
                             San Francisco, CA 94111
                                 (415) 434-4441

THE OSTERWEIS FUND (the "Fund") is a mutual fund with the  investment  objective
of attaining long term total returns. The Fund seeks to achieve its objective by
investing   primarily  in  equity  securities  (common  and  preferred  stocks).
Osterweis Capital Management, Inc. (the "Advisor"), serves as investment advisor
to the Fund.

This Prospectus  sets forth basic  information  about the Fund that  prospective
investors  should  know before  investing.  It should be read and  retained  for
future  reference.  The  Fund  is  one of a  series  of  Professionally  Managed
Portfolios.  A Statement of Additional  Information dated August 1, 1995, as may
be amended from time to time,  has been filed with the  Securities  and Exchange
Commission and is incorporated herein by reference. This Statement of Additional
Information  is available  without  charge by calling the number listed above or
(212) 633-9700. 

                               TABLE OF CONTENTS

                Expense Table............................  2

                Financial Highlights.....................  3

                Objective and Investment
                     Approach of the Fund................  4

                Management of the Fund...................  7

                How To Invest in the Fund................  8

                How To Redeem an
                    Investment in the Fund...............  10

                Services Available to the
                    Fund's Shareholders..................  11

                How the Fund's Per Share Value
                     Is Determined.......................  12

                Distributions and Taxes..................  12

                General Information......................  13

                Appendix.................................  14


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


Prospectus dated August 1, 1995


<PAGE>
   THE  OSTERWEIS  FUND (the "Fund") is a diversified  series of  Professionally
Managed  Portfolios (the "Trust"),  an open-end  management  investment  company
offering  redeemable  shares of  beneficial  interest.  Shares are purchased and
redeemed at their net asset value per share, without a sales charge. The minimum
initial investment is $100,000, with subsequent investments of $1,000 or more.

                                  EXPENSE TABLE

   Expenses are one of several  factors to consider when  investing in the Fund.
The purpose of the  following  fee table is to provide an  understanding  of the
various  costs and  expenses  which may be borne  directly or  indirectly  by an
investment in the Fund. Actual expenses may be more or less than those shown.

      Shareholder Transaction Expenses
      Maximum Sales Load Imposed on Purchases ......................... None
      Maximum Sales Load Imposed on Reinvested Dividends............... None
      Deferred Sales Load.............................................. None
      Redemption Fees.................................................. None
      Exchange Fee..................................................... None

      Annual Fund Operating Expenses (after waiver)*
         (As a percentage of average net assets)
      Management Fees.................................................. 1.00%
      12b-1 Fees....................................................... None
      Other Expenses................................................... 0.75%
                                                                       ------
      Total Fund Operating Expenses.................................... 1.75%*
                                                                       =======

Example

This table illustrates the net transaction and operating  expenses that would be
incurred by an investment  in the Fund over  different  time periods  assuming a
$1,000 investment, a 5% annual return, and redemption at the end of:

      One year........................................................  $ 18
      Three years.....................................................  $ 55

   *The Advisor has  undertaken to limit the  operating  expenses of the Fund to
1.75%  of  average  net  assets  until  a  date  following   advance  notice  to
shareholders.  In the absence of such limitation, the Fund's expenses would have
amounted to 2.32% of average  net assets  during the fiscal year ended March 31,
1995.

   The Example shown above should not be considered a representation  of past or
future  expenses and actual expenses may be greater or less than those shown. In
addition,  Federal regulations require the Example to assume a 5% annual return,
but the Fund's  actual  return may be higher or lower.  See  "Management  of the
Fund."

<PAGE>
                              FINANCIAL HIGHLIGHTS
                 For a share outstanding throughout the period.

The  following  information  has been  audited by Coopers  and  Lybrand  L.L.P.,
independent  accountants,  whose  unqualified  report covering the fiscal period
ended  March 31, 1995 is  incorporated  by  reference  herein and appears in the
annual report to  shareholders.  This  information  shoud be read in conjunction
with the financial statements and accompanying notes thereto which appear in the
Statement  of  Additional  Information.  Further  information  about the  Fund's
performance may be included in its annual report to  shareholders,  which may be
obtained without charge by writing or calling the address or telephone number on
the Prospectus cover page.

<TABLE>
<CAPTION>

- --------------------------------------------------------------------------------------------------
                                                                Year             October 1, 1993*
                                                                Ended                 through
                                                           March 31, 1995         March 31, 1994
- --------------------------------------------------------------------------------------------------
<S>                                                            <C>                    <C>    

Net asset value, beginning of period ....................      $10.28                 $10.00
Income from investment operations:
      Net investment income .............................         .28                    .08
      Net realized and unrealized gain on investments ...         .11                    .22
- --------------------------------------------------------------------------------------------------
Total from investment operations.........................         .39                    .30
- --------------------------------------------------------------------------------------------------
Less distributions:
      Dividends from net investment income...............        (.25)                  (.02)
      Distributions from net capital gains ..............        (.09)                    -0-
- --------------------------------------------------------------------------------------------------
Total distributions......................................        (.34)                  (.02)
- --------------------------------------------------------------------------------------------------
Net asset value, end of period ..........................      $10.33                 $10.28
==================================================================================================

Total return ............................................        3.91%                  6.29%+

Ratios/supplemental data:
Net assets, end of period (millions).....................        $9.8                  $5.1
Ratio of expenses to average net assets:
      Before expense reimbursement ......................        2.32%                  3.73%+
      After expense reimbursement........................        1.74%                  1.75%+
Ratio of net investment income to average net assets:
      Before expense reimbursement ......................        2.74%                  0.42%+
      After expense reimbursement .......................        3.32%                  2.40%+


Portfolio turnover rate .................................       28.65%                 34.97%
</TABLE>

*Commencement of operations.

+Annualized.
<PAGE>
OBJECTIVE AND INVESTMENT APPROACH OF THE FUND
The investment  objective of the Fund is to attain long-term total returns.  The
Fund seeks to achieve its objective by investing primarily in equity securities.
There is, of course,  no assurance  that the Fund's  objective will be achieved.
Because prices of the securities held by the Fund will  fluctuate,  the value of
an  investment  in the Fund  will  vary as the  market  value of its  investment
portfolio changes. In addition to common stocks, equity securities purchased for
the  Fund  may  include  preferred  stocks,  convertible  preferred  stocks  and
warrants.

Investment Approach. The Advisor selects equity securities for the Fund which it
believes offer superior  investment value. The Advisor focuses on the securities
of companies  which it believes to be undervalued or otherwise  out-of-favor  in
the market.  The stock  prices of such  companies  may be  depressed  by visible
near-term  problems and not reflective of the companies'  longer term prospects.
The Advisor places particular emphasis on the analysis of a company's ability to
generate cash and its management's deployment of this cash.

The  Advisor  also seeks  under-  researched,  high  growth  situations  that it
believes  can be  purchased  for  modest  multiples  as well as  companies  with
substantial,  unrecognized  assets and  improving  earnings  prospects.  As such
companies  achieve greater  visibility and their stocks are accorded  valuations
more in line with their growth rates,  the Advisor is inclined to regard them as
candidates   for  sale,  in  order  to  reduce  the  risk  of  future   earnings
disappointments.

Although  equity  securities are the primary focus for the Fund, the Advisor may
also  purchase  fixed income  securities  and  convertible  bonds for the Fund's
portfolio in pursuing its goal of long-term total return. The Advisor prefers to
purchase  fixed income  securities  during times of high real interest  rates or
when it  believes  that the  outlook  for the  equity  markets  is  sufficiently
unsettled to warrant building yield into the Fund's portfolio.

Fixed income  securities  eligible  for purchase by the Fund include  investment
grade corporate debt securities,  those rated BBB or better by Standard & Poor's
Corporation  ("S&P") or Baa or better by Moody's Investors Service  ("Moody's").
Securities  rated  BBB by S&P  are  considered  investment  grade,  but  Moody's
considers  securities  rated Baa to have speculative  characteristics.  The Fund
also may invest up to 5% of its assets in mortgage-related  securities.  See the
Statement of Additional Information.

The Fund may invest in corporate debt securities that are rated below investment
grade,  but will limit that  investment to no more than 30% of its total assets.
Such  securities,  sometimes  referred to as junk bonds,  typically carry higher
coupon  rates  than  investment  grade  securities  but  also are  described  as
speculative by both Moody's and S&P. They may be subject to greater market price
fluctuations, less liquidity, and greater risk of income or principal, including
a greater  possibility  of default 

<PAGE>
or bankruptcy of the issuer of such securities,  than are more highly rated debt
securities.  Lower  rated  fixed  income  securities  also are likely to be more
sensitive  to  adverse  economic  or  company  developments.  During  periods of
economic  downturn or rising interest rates,  highly leveraged  issuers of lower
rated  securities may experience  financial  stress which could adversely affect
their  ability to make  payments of interest  and  principal  and  increase  the
possibility of default. In addition,  the market for lower rated debt securities
has expanded rapidly in recent years, and its growth  paralleled a long economic
expansion.  At times in recent  years,  the  prices  of many  lower  rated  debt
securities declined  substantially,  reflecting an expectation that many issuers
of such securities  might  experience  financial  difficulties.  There can be no
assurance  that such  declines  will not recur.  The market for lower rated debt
issues  generally  is  thinner  and less  active  than that for  higher  quality
securities,  which may limit the Fund's ability to sell such  securities at fair
value in  response  to changes  in the  economy or  financial  markets.  Adverse
publicity and investor perception, whether or not based on fundamental analysis,
may also decrease the values and liquidity of lower rated securities, especially
in a thinly traded market.

The  Advisor  seeks to  reduce  the  risks  associated  with  investing  in such
securities by limiting the Fund's  holdings in such  securities and by the depth
of its own credit  analysis.  The Fund will not invest in such securities  rated
below B by S&P or Moody's.  In selecting below investment grade securities,  the
Advisor seeks  securities  in companies  with  improving  cash flows and balance
sheet  prospects  and whose  credit  ratings the  Advisor  views as likely to be
upgraded.  The Advisor believes that such securities can produce returns similar
to equities,  but with less risk.  See the Appendix for a description of Moody's
and S&P ratings.

Repurchase Agreements. The Fund may enter into repurchase agreements in order to
earn  additional  income on  available  cash,  or as a defensive  investment  in
periods  when  the  Fund is  invested  primarily  in  short-term  maturities.  A
repurchase  agreement is a short-term  investment in which the purchaser  (i.e.,
the Fund) acquires ownership of a U.S.  Government security (which may be of any
maturity) and the seller agrees to repurchase the obligation at a future time at
a set price, thereby determining the yield during the purchaser's holding period
(usually  not more than seven days from the date of  purchase).  Any  repurchase
transaction in which the Fund engages will require full collateralization of the
seller's obligation during the entire term of the repurchase  agreement.  In the
event of a bankruptcy or other default of the seller,  the Fund could experience
both delays in liquidating the underlying security and losses in value. However,
the Fund intends to enter into repurchase agreements only with banks with assets
of $500  million  or more that are  insured  by the  Federal  Deposit  Insurance
Corporation and the most creditworthy  registered securities dealers pursuant to
procedures adopted and regularly


<PAGE>
reviewed  by  the  Trust's   Board  of  Trustees.   The  Advisor   monitors  the
creditworthiness  of the banks and securities dealers with whom the Fund engages
in repurchase transactions.

Illiquid and Restricted Securities. The Fund may not invest more than 15% of its
net assets in illiquid  securities,  including (i) securities for which there is
no readily available  market;  (ii) securities the disposition of which would be
subject to legal restrictions  (so-called  "restricted  securities");  and (iii)
repurchase  agreements  having more than seven days to maturity.  A considerable
period of time may  elapse  between  the  Fund's  decision  to  dispose  of such
securities  and the time when the Fund is able to dispose of them,  during which
time the value of the  securities  could decline.  Restricted  securities do not
include those which meet the  requirements of Securities Act Rule 144A and which
the  Trustees  have  determined  to be liquid  based on the  applicable  trading
markets.

Foreign  Securities.  The Fund  may  invest  up to 20% of its  total  assets  in
securities of foreign  issuers.  The Advisor  usually buys securities of leading
foreign  companies  that have well  recognized  franchises  and are selling at a
discount to the  securities of similar  domestic  businesses.  There may be less
publicly  available  information  about these  issuers than is  available  about
companies in the U.S., and foreign  auditing  requirements may not be comparable
to those in the U.S. In  addition,  the value of the foreign  securities  may be
adversely affected by movements in the exchange rates between foreign currencies
and the U.S.  dollar,  as well as other  political  and  economic  developments,
including the  possibility of  expropriation,  confiscatory  taxation,  exchange
controls or other foreign governmental  restrictions.  Dividends and interest on
foreign  securities may be subject to foreign  withholding  taxes.  The Fund may
also invest without limit in securities of foreign  issuers which are listed and
traded on a U.S. national securities exchange.

Options and  Futures.  The Fund has the ability to invest up to 5% of its assets
in options,  futures and options on  futures,  but has no present  intention  of
using such instruments.  See the Statement of Additional Information for further
information regarding  characteristics of and risks involved in the use of these
instruments.

U.S. Government  Securities.  The Fund may invest in U.S. Government securities.
U.S.  Government  securities  include  direct  obligations  issued  by the  U.S.
Treasury, such as Treasury bills, certificates of indebtedness, notes and bonds.
U.S.  Government  agencies  and   instrumentalities   that  issue  or  guarantee
securities  include,  but are not  limited  to, the  Federal  National  Mortgage
Association ("FNMA"), Government National Mortgage Association ("GNMA"), Federal
Home Loan Banks, Federal Financing Bank, and Student Loan Marketing Association.
All  Treasury  securities  are backed by the full faith and credit of the United
States. Obligations of U.S. Government agencies and instrumentalities may or may
not be supported by the full faith and credit of the United States. Some,

<PAGE>

such as the Federal  Home Loan  Banks,  are backed by the right of the agency or
instrumentality  to borrow from the U.S.  Treasury.  Others,  such as securities
issued by FNMA, are supported only by the credit of the  instrumentality and not
by the U.S.  Treasury.  If the  securities  are not backed by the full faith and
credit of the United States,  the owner of the securities must look  principally
to the agency issuing the obligation for repayment and may not be able to assert
a  claim   against   the  United   States  in  the  event  that  the  agency  or
instrumentality does not meet its commitment.

Investment  Restrictions.  The Fund has adopted certain investment restrictions,
which are described fully in the Statement of Additional  Information.  Like the
Fund's investment  objective,  certain of these restrictions are fundamental and
may be changed only by a majority vote of the Fund's outstanding shares.

MANAGEMENT OF THE FUND
The  Board  of  Trustees  of the  Trust  establishes  the  Fund's  policies  and
supervises and reviews the management of the Fund. Osterweis Capital Management,
Inc.,  acts as the  Fund's  Advisor,  and has  been in the  investment  advisory
business  since  1983.  The Advisor  provides  investment  advisory  services to
individual and  institutional  accounts with a value in excess of  $600,000,000.
Mr. John S.  Osterweis,  President and Director of the Advisor,  is  principally
responsible for the management of the Fund's portfolio. He has over twenty years
of securities analysis and portfolio management experience.

The Advisor  provides  the Fund with  advice on buying and  selling  securities,
manages the  investments  of the Fund,  furnishes the Fund with office space and
certain  administrative  services,  and provides most of the personnel needed by
the Fund. As  compensation,  the Fund pays the Advisor a monthly  management fee
(accrued  daily) based upon the average daily net assets of the Fund at the rate
of   1.00%   annually.    Southampton   Investment   Management   Company   (the
"Administrator")   acts  as  the   Fund's   administrative   manager   under  an
Administrative  Management  Agreement.  Under that agreement,  the Administrator
prepares various federal and state regulatory  filings,  reports and returns for
the Fund,  prepares  reports  and  materials  to be  supplied  to the  Trustees,
monitors the activities of the Fund's custodian, transfer agent and accountants,
and  coordinates  the  preparation  and payment of Fund expenses and reviews the
Fund's expense accruals.  For its services, the Administrator receives an annual
fee equal to the greater of 0.25 of 1% of the Fund's average daily net assets or
$30,000.

The Fund is  responsible  for its own  operating  expenses,  including,  but not
limited  to, the  advisory  and  administrative  management  fees,  custody  and
transfer agent fees, legal and auditing expenses, federal and state registration
fees, and fees to the Trust's disinterested  Trustees. The Advisor has agreed to
reduce its fees or reimburse the Fund for its annual  operating 

<PAGE> 

     expenses which exceed the most stringent limits  prescribed by any state in
which the Fund's  shares are offered for sale.  The Advisor  also may reduce its
fees,  make  payments  on behalf of the Fund for  expenses  which are the Fund's
obligation under the Advisory agreement,  or reimburse additional amounts to the
Fund at any time in order to reduce the Fund's  expenses.  In this  regard,  the
Advisor currently has undertaken to limit the Fund's operating expenses to 1.75%
of average net assets.  Any such  reductions  made by the Advisor in its fees or
payments  or  reimbursement  of  expenses  which are the Fund's  obligation  are
subject to  reimbursement  by the Fund within the following three years provided
the Fund is able to effect  such  reimbursement  and remain in  compliance  with
applicable expense limitations.

The  Advisor  considers  a number of factors  in  determining  which  brokers or
dealers to use for the Fund's portfolio transactions. While these are more fully
discussed in the Statement of Additional  Information,  the factors include, but
are not limited to, the  reasonableness of commissions,  quality of services and
execution,  and the  availability of research which the Advisor may lawfully and
appropriately use in its investment management and advisory capacities. Provided
the Fund receives prompt execution at competitive  prices,  the Advisor may also
consider the sale of Fund shares as a factor in selecting broker-dealers for the
Fund's portfolio transactions.

HOW TO INVEST IN THE FUND
The minimum initial  investment is $100,000.  Subsequent  investments must be at
least  $1,000.  First  Fund  Distributors,  Inc.  (the  "Distributor"),  acts as
Distributor of the Fund's shares. The Distributor may, at its discretion,  waive
the minimum investment requirements.  In addition to cash purchases,  shares may
be purchased by tendering payment in kind in the form of shares of stock,  bonds
or other  securities,  provided  that  any such  tendered  security  is  readily
marketable,  its acquisition is consistent with the Fund's investment  objective
and the  tendered  security  is  otherwise  acceptable  to the  Fund's  Advisor.
Purchasing  shares in this manner  will cause the  investor to realize a capital
gain or loss on each security tendered.  The investor must also agree to pay the
brokerage  commissions  on the sale of any security so tendered if it is sold by
the Fund within 90 days of acquisition.

Investors may purchase shares of the Fund by check or wire:

By check:

Initial Investment.  Complete the Fund's Account Application (included with this
Prospectus).  Make your check payable to "The  Osterweis  Fund." Mail or deliver
the completed Account Application and your check to the Fund's Transfer Agent:

   The Provident Bank
   Mutual Fund Services
   P.O. Box 14967
   Cincinnati, OH 45250-0967
<PAGE>
Subsequent  Investments.  Detach and complete the stub  attached to your account
statement.  Make  your  check  payable  to  "The  Osterweis  Fund."  Write  your
shareholder  account  number  on the  check.  Mail  or  deliver  the  check  and
reinvestment  form to the Provident Bank in the envelope provided or send to the
Bank at the address indicated above.

By wire:

Initial  Investment.  Before  wiring  funds,  call the  Transfer  Agent at (800)
424-2295  to advise  the  Transfer  Agent  that you  intend  to make an  initial
investment by wire and to receive an account number.  Provide the Transfer Agent
with your name, and the dollar amount to be invested.

Complete the Fund's Account Application (included with this Prospectus). Be sure
to include  the date and the order  confirmation  number.  Mail or  deliver  the
completed   Application  to  the  address  shown  at  the  top  of  the  Account
Application.

Request your bank to transmit  immediately  available funds by wire for purchase
of shares in your name to the Fund's Custodian, as follows:

                               The Provident Bank
                           Attn: Mutual Fund Services
                         ABA Routing Number: 042-000-424
                    for further credit to The Osterweis Fund
                      Account Number [Name of Shareholder]

Subsequent Investments.  Instruct your bank to wire funds as indicated above. It
is not  necessary  to contact  the  Transfer  Agent  prior to making  subsequent
investments  by wire. It is essential that complete  information  regarding your
account be included in all wire  instructions in order to facilitate  prompt and
accurate handling of investments. Investors may obtain further information about
remitting funds in this manner from the Transfer Agent, and any fees that may be
imposed by their own banks.

General.  Investors will not be permitted to redeem any shares purchased with an
initial  investment  made by wire  until one  business  day after the  completed
Account  Application  is received by the Fund. All  investments  must be made in
U.S. dollars and, to avoid fees and delays,  checks should be drawn only on U.S.
banks and should not be made by third  party  check.  A charge may be imposed if
any check  used for  investment  does not  clear.  The Fund and the  Distributor
reserve the right to reject any purchase order in whole or in part.

If an order to  purchase  shares,  together  with  payment  in proper  form,  is
received  by the  Transfer  Agent by the close of  trading on the New York Stock
Exchange  (currently 4:00 p.m.,  Eastern time), Fund shares will be purchased at
the offering price determined as of the close of trading on that day. Otherwise,
Fund shares will be purchased at the offering  price  determined as of the close
of trading on the New York Stock Exchange on the next business day.

Federal  tax  law  requires  that   investors   provide  a  certified   Taxpayer
Identification Number and certain other required  certifications upon opening or
reopening an account in order to avoid backup  withholding  of taxes at the rate
of 31% on taxable distributions

<PAGE>

proceeds  of  redemptions.  See  the  Fund's  Account  Application  for  further
information concerning this requirement.

The  Fund  does  not  issue   share   certificates.   All  shares  are  held  in
non-certificated  form  registered  on the  books  of the  Fund  and the  Fund's
Transfer Agent for the account of the shareholder.

HOW TO REDEEM AN INVESTMENT IN THE FUND
A  shareholder  has the right to have the Fund  redeem all or any portion of his
outstanding  shares at their  current  net asset  value on each day the New York
Stock Exchange is open for trading.  The redemption price is the net asset value
per share next determined after the shares are validly tendered for redemption.

Direct  Redemption.  A written  request for  redemption  must be received by the
Fund's Transfer Agent in order to constitute a valid tender for  redemption.  To
protect the Fund and its  shareholders,  a signature  guarantee  is required for
certain  transactions,  including  redemptions.  Signature(s)  on the redemption
request must be guaranteed by an "eligible guarantor  institution" as defined in
the federal securities laws; these institutions  include banks,  broker-dealers,
credit unions and savings institutions.  A broker-dealer guaranteeing signatures
must be a member of a clearing  corporation  or maintain net capital of at least
$100,000.  Credit  unions  must be  authorized  to issue  signature  guarantees.
Signature  guarantees will be accepted from any eligible  guarantor  institution
which  participates in a signature  guarantee program. A notary public is not an
acceptable guarantor.

Telephone  Redemption.  Shareholders  who complete the  Redemption  by Telephone
portion of the Fund's Account  Application may redeem shares on any business day
the New York Stock  Exchange  is open by calling  the Fund's  Transfer  Agent at
(800) 424-2295 before 4:00 p.m. Eastern time. Redemption proceeds will be mailed
or  wired  at  the  shareholder's   direction  the  next  business  day  to  the
predesignated  account.  The minimum  amount  that may be wired is $1,000  (wire
charges, if any, will be deducted from redemption proceeds).

By establishing  telephone redemption  privileges,  a shareholder authorizes the
Fund  and its  Transfer  Agent  to act upon the  instruction  of any  person  by
telephone to redeem from the account for which such service has been  authorized
and transfer the proceeds to the bank account  designated in the  Authorization.
The Fund and the Transfer Agent will use  procedures to confirm that  redemption
instructions received by telephone are genuine, including recording of telephone
instructions  and requiring a form of personal  identification  before acting on
such  instructions.  Neither the Fund nor the Transfer  Agent will be liable for
any loss,  expense,  or cost arising out of any  telephone  redemption  request,
including any fraudulent or unauthorized  requests that are reasonably  believed
to be


<PAGE>
genuine,  provided  that such  procedures  are  followed.  The Fund may  change,
modify,  or terminate these privileges at any time upon at least 60 days' notice
to shareholders.

Shareholders  may  request  telephone  redemption  after an  account  is opened;
however,  the authorization  form will require a separate  signature  guarantee.
Shareholders may experience  delays in exercising  telephone  redemption  during
periods of abnormal market activity.

General. Payment of the redemption proceeds will be made promptly, but not later
than seven days after the receipt of all  documents in proper form,  including a
written  redemption  order with appropriate  signature  guarantee in cases where
telephone redemption privileges are not being utilized. The Fund may suspend the
right of redemption under certain extraordinary circumstances in accordance with
the  rules of the  Securities  and  Exchange  Commission.  In the case of shares
purchased by check and redeemed  shortly after purchase,  the Fund will not mail
redemption  proceeds  until it has been  notified  that the  check  used for the
purchase  has been  collected,  which may take up to 15 days  from the  purchase
date.  To  minimize  or avoid  such  delay,  investors  may  purchase  shares by
certified check or federal funds wire. A redemption may result in recognition of
a gain or loss for federal income tax purposes.

Due to the  relatively  high  cost of  maintaining  smaller  accounts,  the Fund
reserves the right to redeem shares in any account,  other than  retirement plan
or Uniform  Gifts/Transfers  to Minors  Acts  accounts,  if at any time,  due to
redemptions by the shareholder,  the total value of a shareholder's account does
not equal at least $1,500.  If the Fund  determines to make such an  involuntary
redemption, the shareholder will first be notified that the value of his account
is less than $1,500 and will be allowed 30 days to make an additional investment
to bring the value of his account to at least  $1,500  before the Fund takes any
action.

SERVICES AVAILABLE TO THE FUND'S SHAREHOLDERS
Retirement  Plans.  The minimum  initial  investment for such plans is $100,000,
with  minimum  subsequent  investments  of $1,000.  The Fund  offers a prototype
Individual  Retirement  Account  ("IRA") plan, and information is available from
the Distributor or from securities dealers with respect to Keogh, Section 403(b)
and other  retirement  plans  offered.  Investors  should  consult a tax advisor
before establishing any retirement plan.

Check-A-Matic  Plan.  For the  convenience  of  shareholders,  the Fund offers a
preauthorized  check service under which a check is  automatically  drawn on the
shareholder's  personal  checking account each month for a predetermined  amount
(but not less than  $250).  Upon  receipt of the check,  the Fund  automatically
invests  the  money in  additional  shares of the Fund at the  current  offering
price.  Applications for this service are available from the Distributor.  There
is no charge by the Fund for this service.

<PAGE>
The  Distributor  may  terminate  or modify  this  privilege  at any  time,  and
shareholders  may terminate their  participation by notifying the Transfer Agent
in writing.

Systematic  Withdrawal  Program.  As  another  convenience,  the  Fund  offers a
Systematic  Withdrawal  Program  whereby  shareholders  may request that a check
drawn in a predetermined  amount be sent to them each month or calendar quarter.
A shareholder's  account must have Fund shares with a value of at least $100,000
in order to start a Systematic  Withdrawal Program,  and the minimum amount that
may be withdrawn each month or quarter under the Systematic  Withdrawal  Program
is $100. This Program may be terminated or modified by a shareholder or the Fund
at any time without charge or penalty.

A withdrawal  under the Systematic  Withdrawal  Program involves a redemption of
shares,  and may result in a gain or loss for federal  income tax  purposes.  In
addition,  if  the  amount  withdrawn  exceed  the  dividends  credited  to  the
shareholder's account, the account ultimately may be depleted.

HOW THE FUND'S PER SHARE VALUE IS DETERMINED
The net asset value of a Fund share is determined  once daily as of the close of
public  trading on the New York Stock  Exchange  (currently  4:00 p.m.,  Eastern
time) on each day the New York Stock  Exchange  is open for  trading.  Net asset
value per share is  calculated by dividing the value of the Fund's total assets,
less its liabilities, by the number of Fund shares outstanding.

Portfolio  securities  are valued using  current  market  values,  if available.
Securities for which market  quotations are not readily  available are valued at
fair  values as  determined  in good  faith by or under the  supervision  of the
Trust's officers in accordance with methods which are specifically authorized by
the Board of Trustees. Short-term obligations with remaining maturities of sixty
days or less are valued at amortized cost as reflecting fair value.

DISTRIBUTIONS AND TAXES
Dividends and Distributions.  Dividends from net income are declared and paid at
least  annually,  typically  after the end of the Fund's  fiscal  year.  Any net
capital gains realized during the Fund's fiscal year will also be distributed to
shareholders  in June,  with a  supplemental  distribution  in  December  of any
undistributed  net capital  gains earned  during the 12-month  period ended each
October 31.  Dividends and capital gain  distributions  (net of any required tax
withholding) are  automatically  reinvested in additional  shares of the Fund at
the net asset value per share on the  reinvestment  date unless the  shareholder
has  previously  requested in writing to the Transfer Agent that payment be made
in cash.

Any dividend or distribution paid by the Fund has the effect of reducing the net
asset value per share on the

<PAGE>
reinvestment  date by the  amount of the  dividend  or  distribution.  Investors
should note that a dividend or  distribution  paid on shares  purchased  shortly
before such  dividend or  distribution  was  declared  will be subject to income
taxes as discussed below even though the dividend or distribution represents, in
substance, a partial return of capital to the shareholder.

Taxes.  The Fund  intends  to qualify  and elect to be  treated  as a  regulated
investment  company under Subchapter M of the Internal Revenue Code of 1986 (the
"Code").  As long as the  Fund  continues  to  qualify,  and as long as the Fund
distributes all of its income each year to the  shareholders,  the Fund will not
be subject to any federal or excise taxes.  The  distributions  made by the Fund
will be taxable to shareholders  whether  received in shares  (through  dividend
reinvestment)  or in cash.  Distributions  derived from net  investment  income,
including net short-term  capital gains, are taxable to shareholders as ordinary
income. A portion of these distributions may qualify for the  dividends-received
deduction.  Distributions  designated as capital gains  dividends are taxable as
long-term capital gains regardless of the length of time shares of the Fund have
been held. Although  distributions are generally taxable when received,  certain
distributions  made in January are taxable as if  received  the prior  December.
Shareholders  will be  informed  annually of the amount and nature of the Fund's
distributions.

Additional  information  about taxes is set forth in the Statement of Additional
Information.  Shareholders should consult their own advisers concerning federal,
state and local taxation of distributions from the Fund.

GENERAL INFORMATION
The Trust. The Trust was organized as a Massachusetts business trust on February
17, 1987.  The Agreement and  Declaration of Trust permits the Board of Trustees
to  issue an  unlimited  number  of full and  fractional  shares  of  beneficial
interest,  without par value,  which may be issued in any number of series.  The
Board of  Trustees  may from time to time  issue  other  series,  the assets and
liabilities  of which will be separate and distinct from any other  series.  The
fiscal year of the Fund ends on March 31.

Shareholder Rights. Shares issued by the Fund have no preemptive,  conversion or
subscription  rights.  Shareholders  have  equal  and  exclusive  rights  as  to
dividends and distributions as declared by the Fund and to the net assets of the
Fund upon  liquidation  or  dissolution.  The Fund, as a separate  series of the
Trust,  votes separately on matters  affecting only the Fund (e.g.,  approval of
the Advisory and Administrative Management Agreements);  all series of the Trust
vote as a single class on matters affecting all series jointly or the Trust as a
whole (e.g., election or removal of Trustees). Voting rights are not cumulative,
so that the  holders of more than 50% of the shares  voting in any  election  of
Trustees can, if they so choose,  elect all of the Trustees.  While the Trust is
not required and does not intend to hold annual

<PAGE>
meetings of  shareholders,  such meetings may be called by the Trustees in their
discretion,  or upon  demand by the  holders  of 10% or more of the  outstanding
shares of the Trust for the purpose of electing or removing Trustees.

Performance  Information.  From  time to time,  the Fund may  publish  its total
return  in  advertisements  and   communications  to  investors.   Total  return
information  will include the Fund's  average annual  compounded  rate of return
over the most recent four calendar  quarters and over the period from the Fund's
inception of  operations.  The Fund may also  advertise  cumulative  and average
total return information over different periods of time. The Fund's total return
will be based  upon the value of the  shares  acquired  through  a  hypothetical
$1,000  investment at the  beginning of the  specified  period and the net asset
value of such  shares at the end of the  period,  assuming  reinvestment  of all
distributions.  Total return figures will reflect all recurring  charges against
Fund income.  Investors should note that the investment results of the Fund will
fluctuate  over time,  and any  presentation  of the Fund's total return for any
prior period should not be considered as a representation  of what an investor's
total return may be in any future period.

Shareholder  Inquiries.  Shareholder inquiries should be directed to the Fund at
the number shown on the cover of the Prospectus.
- -------------------------------------------------------------------------------
APPENDIX
Description of Bond Ratings*
Moody's Investors Service

Aaa:  Bonds  rated Aaa are  judged  to be of the best  quality.  They  carry the
smallest degree of investment risk.  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 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 fluctuations  or protective  elements may be
of greater amplitude or there may be other elements present which make long-term
risks appear somewhat larger than in Aaa securities.

A: Bonds 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 a susceptibility to impairment sometime in the future.

Baa: Bonds 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

<PAGE>

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.

Ba: Bonds rated Ba are judged to have speculative elements:  their future cannot
be considered as well  assured.  Often the  protection of interest and principal
payments may be very moderate and thereby not well safeguarded  during both good
and bad times over the future.  Uncertainly of position  characterizes  bonds in
this class.

B: Bonds rated B generally  lack  characteristics  of the desirable  investment.
Assurance of interest and principal payments or of maintenance of other terms of
the    contract    over   any   long    period    of   time   may   be    small.
- --------------------------------------------------------------------------------
Standard & Poor's Corporation

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

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

BB and B:  Bonds  rated BB and B are  regarded,  on  balance,  as  predominately
speculative with respect to the issuer's  capacity to pay interest and principal
in accordance with the terms of the  obligation.  BB indicates a lower degree of
speculation than B. While such bonds will likely have some quality of protective
characteristics,  these are  outweighed  by large  uncertainties  or major  risk
exposures to adverse conditions.

The  ratings  may be  modified  by the  addition of a plus or minus sign to show
relative standing within the major rating categories.

*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.

<PAGE>
                                     Advisor

                        Osterweis Capital Mangement, Inc.
                         One Maritime Plaza, Suite 1201
                         San Francisco, California 94111


================================================================================

                                   Distributor

                          First Fund Distributors, Inc.
                       4455 E. Camelback Road, Suite 261-E
                             Phoenix, Arizona 85018


================================================================================

                          Custodian and Transfer Agent

                               The Provident Bank
                                 P.O. Box 14967
                           Cincinnati, Ohio 45250-0967
                                 (800) 424-2295


================================================================================

                                    Auditors

                           Coopers and Lybrand L.L.P.
                               350 S. Grand Avenue
                          Los Angeles, California 90071


================================================================================
                                  Legal Counsel

                        Heller, Ehrman, White & McAuliffe
                                 333 Bush Street
                         San Francisco, California 94104


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