PROFESSIONALLY MANAGED PORTFOLIOS
497, 1999-08-16
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                                  PORTFOLIO 21










                                   PROSPECTUS

                                  JUNE 28, 1999,
                           AS AMENDED AUGUST 17, 1999
<PAGE>
                                  PORTFOLIO 21,
                  A SERIES OF PROFESSIONALLY MANAGED PORTFOLIOS


     Portfolio  21 is a growth  stock  mutual  fund.  The Fund  seeks to provide
investors with long-term growth of capital.

AS WITH ALL MUTUAL  FUNDS,  THE  SECURITIES  AND  EXCHANGE  COMMISSION  DOES NOT
APPROVE OR DISAPPROVE OF THESE SHARES OR DETERMINE  WHETHER THE  INFORMATION  IN
THIS PROSPECTUS IS TRUTHFUL OR COMPLETE.  IT IS A CRIMINAL OFFENSE FOR ANYONE TO
INFORM YOU OTHERWISE.



                  THE DATE OF THIS PROSPECTUS IS JUNE 28, 1999,
                           AS AMENDED AUGUST 17, 1999


THE FUND IS  CURRENTLY  NOT  AVAILABLE  FOR  INVESTMENT,  BUT  WILL  OPEN TO NEW
SHAREHOLDERS ON SEPTEMBER 21, 1999

Do not send money prior to September 21, 1999
<PAGE>
                                TABLE OF CONTENTS

An Overview of the Portfolio................................................   3
Fees and Expenses...........................................................   4
Investment Objective and Principal Investment Strategies....................   5
Principal Risks of Investing in the Portfolio...............................   6
Investment Advisor..........................................................   7
Shareholder Information.....................................................   7
Pricing of Portfolio Shares.................................................  11
Dividends and Distributions.................................................  11
Tax Consequences............................................................  12

2
<PAGE>
                          AN OVERVIEW OF THE PORTFOLIO

PORTFOLIO 21'S INVESTMENT GOAL

The Portfolio seeks long-term growth of capital.

PORTFOLIO 21'S PRINCIPAL INVESTMENT STRATEGIES

The  Portfolio  will  primarily  invest in common stocks of domestic and foreign
companies of any size market  capitalization that satisfy certain  environmental
responsibility  criteria.  Such  companies must also exhibit  certain  financial
characteristics  that indicate positive prospects for long-term earnings growth.
Portfolio  21 refers to the 21st century and the forward  thinking  that will be
required to sustain us in the new century. In selecting  investments the Advisor
will concentrate on those companies that have made a commitment to environmental
sustainability  and have  demonstrated  this  commitment  through their business
strategies,  practices  and  investments.  The  Advisor  employs  a  "bottom-up"
approach to stock selection.

PRINCIPAL RISKS OF INVESTING IN PORTFOLIO 21

There is the risk that you could lose money on your investment in the Portfolio.
The following risks could affect the value of your investment:

     *    The stock market goes down
     *    Interest  rates go up which  can  result in a  decline  in the  equity
          market o Growth stocks fall out of favor with the stock market
     *    Stocks held by the  Portfolio may not increase  their  earnings at the
          rate anticipated
     *    Securities of  smaller-capitalization  companies  involve greater risk
          than investing larger-capitalization companies
     *    Adverse  developments  occur in foreign markets.  Foreign  investments
          involve greater risk.
     *    The Portfolio's  environmental  policy could cause it to make or avoid
          investments that could result in the Portfolio underperforming similar
          funds that do not have an environmental policy.

WHO MAY WANT TO INVEST IN PORTFOLIO 21

The Portfolio may be appropriate for investors who:

     *    Want an  equity  investment  in  companies  that  are  environmentally
          responsible
     *    Are pursuing a long-term goal such as retirement
     *    Want to add an  investment  with growth  potential to diversify  their
          investment portfolio
     *    Are  willing  to accept  higher  short-term  risk  along  with  higher
          potential for long-term growth

                                                                               3
<PAGE>
The Portfolio may not be appropriate for investors who:

     *    Need regular income or stability of principal
     *    Are pursuing a short-term goal

                                FEES AND EXPENSES

This table  describes the fees and expenses that you may pay if you buy and hold
shares of the Portfolio.

SHAREHOLDER FEES
(fees paid directly from your investment)

Maximum sales charge (load) imposed on purchases.......................   None
Maximum deferred sales charge (load)...................................   None

ANNUAL FUND OPERATING EXPENSES*
(expenses that are deducted from Portfolio assets)

Management Fees........................................................   1.00%
Other Expenses.........................................................   2.50%
                                                                         -----
Total Annual Fund Operating Expenses...................................   3.50%
Fee Reduction and/or Expense Reimbursement.............................  (2.00%)
                                                                         -----
Net Expenses...........................................................   1.50%
                                                                         -----

- ----------
* Other Expenses are estimated for the first fiscal year of the  Portfolio.  The
Advisor has  contractually  agreed to reduce its fees and/or pay expenses of the
Portfolio for a ten-year period to ensure that the Portfolio's Total Fund Annual
Operating Expenses will not exceed 1.50%. If the Advisor does reduce its fees or
pay Portfolio expenses, the Portfolio may reimburse the Advisor in future years.
The Trustees may terminate this expense reimbursement arrangement at any time.

EXAMPLE

This Example is intended to help you compare the costs of investing in shares of
the Portfolio with the cost of investing in other mutual funds.

The Example assumes that you invest $10,000 in the Portfolio for the time period
indicated  and then redeem all of your shares at the end of those  periods.  The
Example also assumes that your investment has a 5% return each year and that the
Portfolio's  operating expenses remain the same.  Although your actual costs may
be higher or lower, under the assumptions, your costs would be:

      One Year.......................................  $153
      Three Years....................................  $474

4
<PAGE>
            INVESTMENT OBJECTIVE AND PRINCIPAL INVESTMENT STRATEGIES

     The Portfolio's investment goal is long-term growth of capital.

     The Portfolio will concentrate its investments in stocks selected for their
growth  potential.  The  Portfolio  may invest in  companies  of any size,  from
larger,  well-established  companies to smaller,  emerging growth companies. The
Portfolio  may  invest in  domestic  as well as  foreign  securities,  including
American Depositary Receipts ("ADRs").

     The Portfolio will  concentrate its investments in companies that have made
a  commitment  to  environmental   sustainability  and  have  demonstrated  this
commitment  through their business  strategies,  practices and investments.  The
Advisor   believes   the  essence  of   environmental   sustainability   is  the
acknowledgment of the limits of nature and society's  dependence on nature.  The
Advisor's investment  perspective  recognizes the fundamental challenge we face:
meeting human needs without undermining  nature's ability to support our economy
in the  future.  Some of these  companies  are  changing  the  landscape  of the
industry they are in or are forcing others in their industry to catch up. Others
have product lines that are ecologically  superior to their  competition.  Still
others are developing  vitally  needed  technologies  that will provide  cleaner
energy sources for the future.

     Companies  selected  for  consideration  must  display  some  or all of the
following qualities:

     *    Corporate   leadership  that  has  made  an  explicit   commitment  to
          sustainable  practices  and has  allocated  significant  resources  to
          achieve these goals
     *    Earnings  improvements  that are derived  from the  efficient  use and
          reuse of resources
     *    Ecologically superior product lines
     *    Investments in renewable energy
     *    Innovative transportation and distribution strategies
     *    Fair and  efficient  use of resources  with  respect to meeting  human
          needs

     The Advisor focuses on individual  companies that meet their  environmental
sustainability  criteria.  The Advisor then  consider's  the company's  standing
relative  to its  competition  in such  areas as the  ecological  impact  of its
products and services,  investments in sustainable  technologies  and processes,
resource efficiency, waste and pollution intensity and environmental management.
Companies that meet these criteria are investigated  further through a review of
their financial and environmental statements,  third party research and personal
contact with company representatives.

     In  addition  to  the  environmental  sustainability  criteria,  a  company
selected for the Portfolio must exhibit certain financial  characteristics  that
indicate positive prospects for long-term earnings growth. These include some or
all of the following:

     *    rising trends in revenues and earnings
     *    sound balance sheet
     *    increasing profit margins
     *    evolving product lines

     The actual selection process is a bottom-up  approach.  This means that the
Advisor will  concentrate  on the specific  characteristics  of each company and
then qualify the company using financial and environmental  criteria appropriate
to their industry groups.

                                                                               5
<PAGE>
     On an ongoing basis,  all companies are reviewed to confirm their continued
commitment to sustainability. Decisions to sell a security will be made when one
or both of the following occurs:

     *    The company no longer meets the environmental sustainability criteria
     *    The company no longer meets minimum financial standards

     Under normal market  conditions,  the Portfolio will stay fully invested in
stocks.  However,  the  Portfolio  may  temporarily  depart  from its  principal
investment  strategies by making  short-term  investments in cash equivalents in
response to adverse market, economic or political conditions. This may result in
the Portfolio not achieving its investment objective.

     In keeping with its  investment  approach,  the Advisor does not anticipate
frequent buying and selling of securities.  This means that the Portfolio should
have a low rate of portfolio  turnover and the  potential to be a tax  efficient
investment.   This  should  result  in  the  realization  and   distribution  to
shareholders  of lower capital  gains,  which would be considered tax efficient.
The anticipated lack of frequent trading also leads to lower transaction  costs,
which could help to improve performance.

                  PRINCIPAL RISKS OF INVESTING IN THE PORTFOLIO

     The principal risks of investing in the Portfolio that may adversely affect
the  Portfolio's  net  asset  value  or total  return  are  summarized  above in
"Principal  Risks of Investing in  Portfolio  21." These risks are  discussed in
more detail below.

     MARKET  RISK.  The risk that the market value of a security may move up and
down,  sometimes  rapidly  and  unpredictably.  These  fluctuations  may cause a
security to be worth less than the price originally paid for it, or less than it
was worth at an earlier time. Market risk may affect a single issuer,  industry,
sector of the economy or the market as a whole.

     SMALLER AND NEWER  COMPANIES  RISK.  Investing in securities of smaller and
newer  companies  may involve  greater risk than  investing in larger  companies
because they can be subject to more abrupt or erratic  share price  changes than
larger  companies.  Small companies may have limited  product lines,  markets or
financial resources and their management may be dependent on a limited number of
key individuals. Securities of these companies may have limited market liquidity
and their prices may be more volatile.

     FOREIGN SECURITIES RISK. The risk of investing in the securities of foreign
companies is greater than the risk of investing in domestic  companies.  Some of
these risks include:  (1) unfavorable  changes in currency  exchange rates;  (2)
economic and political instability; (3) less publicly available information; (4)
less strict auditing and financial reporting requirements; (5) less governmental
supervision and regulation of securities markets;  (6) higher transaction costs;
(7)  potential  adverse  effects  of  the  euro  conversion;   and  (8)  greater
possibility of not being able to sell securities on a timely basis.

     ENVIRONMENTAL  SUSTAINABILITY  POLICY RISK. The  Portfolio's  environmental
sustainability  policy could cause it to underperform  similar funds that do not
have such a policy.  Among the reasons for this are (a) growth  stocks that meet
the Portfolio's  environmental  sustainability criteria could underperform those
stocks  that  do not  meet  this  criteria;  and (b) a  company's  environmental
policies  could  cause  the  Portfolio  to  sell  or not  purchase  stocks  that
subsequently  perform well.

6
<PAGE>
     YEAR 2000 RISK. The risk that the Portfolio could be adversely  affected if
the  computer  systems  used by the Advisor and other  service  providers do not
properly process and calculate dates beginning January 1, 2000. This is commonly
known as the "Year 2000  Problem."  This  situation  may  negatively  affect the
companies  in which the  Portfolio  invests  and by  extension  the value of the
Portfolio's shares.  Although the Portfolio's service providers are taking steps
to address this issue, there may still be some risk of adverse effects.

                               INVESTMENT ADVISOR

     Progressive  Investment Management Corporation is the investment advisor to
the  Portfolio.  The  investment  advisor's  address  is 2435 SW  Fifth  Avenue,
Portland,  OR 97201.  The  investment  advisor,  which was  established in 1987,
provides socially responsible  investment  management services to individual and
institutional  investors and manages assets of approximately  $140 million.  The
investment  advisor  provides  advice  on buying  and  selling  securities.  The
investment  advisor also  furnishes the Portfolio  with office space and certain
administrative  services  and  provides  most  of the  personnel  needed  by the
Portfolio. For its services, the Portfolio pays the investment advisor a monthly
management  fee based upon the average  daily net assets of the Portfolio at the
rate of 1.00% annually.

     The Portfolio  will be managed by a committee of  investment  professionals
associated with the Advisor.

PORTFOLIO EXPENSES

     The Portfolio is responsible  for its own operating  expenses.  The Advisor
has contractually agreed to reduce its fees and/or pay expenses of the Portfolio
to ensure that the Portfolio's  aggregate annual operating  expenses  (excluding
interest  and tax  expenses)  will not exceed 1.50% of the  Portfolio's  average
daily net assets.  Any reduction in advisory fees or payment of expenses made by
the Advisor are subject to  reimbursement  by the  Portfolio if requested by the
Advisor in subsequent fiscal years.  This  reimbursement may be requested by the
Advisor if the aggregate  amount actually paid by the Portfolio toward operating
expenses for such fiscal year (taking into account the reimbursements)  does not
exceed the applicable limitation on Portfolio expenses. The Advisor is permitted
to be reimbursed  for fee reductions  and/or expense  payments made in the prior
three  fiscal  years.  (After  startup,  the  Portfolio is permitted to look for
longer periods of four and five years.) Any such  reimbursement will be reviewed
by the Trustees.  The Portfolio must pay its current ordinary operating expenses
before the Advisor is entitled to any reimbursement of fees and/or expenses.

                             SHAREHOLDER INFORMATION

HOW TO BUY SHARES

     There are several ways to purchase shares of the Portfolio.  An Application
Form, which  accompanies this Prospectus,  is used if you send money directly to
the Portfolio by mail or by wire. If you have questions about how to invest,  or
about how to complete the Application Form, please call 1-800-282-2340.  To open
an account by wire or to open a retirement  account,  call  1-800-282-  2340 for
instructions.  You may also buy shares of the Portfolio  through your  financial
representative.  After your account is open,  you may add to it at any time. The
Portfolio reserves the right to reject any purchase in whole or in part.

     You may buy and sell shares of the Portfolio  through  certain brokers (and
their agents) that have made arrangements with the Portfolio to sell its shares.
When you place your order with such a broker or its authorized agent, your order

                                                                               7
<PAGE>
is treated as if you had placed it directly with the Portfolio's Transfer Agent,
and you will pay or receive  the next price  calculated  by the  Portfolio.  The
broker (or agent)  holds your shares in an omnibus  account in the  broker's (or
agent's) name, and the broker (or agent)  maintains  your  individual  ownership
records.  The  Advisor may pay the broker (or its agent) for  maintaining  these
records as well as  providing  other  shareholder  services.  The broker (or its
agent) may charge you a fee for  handling  your order.  The broker (or agent) is
responsible  for  processing  your order  correctly  and  promptly,  keeping you
advised  regarding  the  status  of your  individual  account,  confirming  your
transactions and ensuring that you receive copies of the Portfolio's prospectus.

     You may open a Portfolio account with $5,000 and add to your account at any
time with $100 or more. You may open a retirement account with $1,000 and add to
your account at any time with $100 or more. Automatic investment plans allow you
to open a Fund  account  with $1,000 and add to your  account with $100 or more.
The  minimum  investment  requirements  may be  waived  from time to time by the
Portfolio.

     BY MAIL. You may make an investment in the Portfolio by mail. All purchases
by check  should be in U.S.  dollars.  Third  party  checks and cash will not be
accepted.  If you wish to invest by mail,  simply complete the Application  Form
and mail it with a check (made  payable to  "Portfolio  21") to the Portfolio at
the following address:

     Portfolio 21
     c/o American Data Services, Inc.
     P.O. Box 5536
     Hauppauge, NY 11788-0132

     If you are making a subsequent  purchase, a stub is attached to the account
statement  you will  receive  after each  transaction.  Detach the stub from the
statement and mail it together  with a check made payable to  "Portfolio  21" in
the  envelope  provided  with your  statement to the address  noted above.  Your
account number should be written on the check.

     BY OVERNIGHT DELIVERY.  If you wish to send your Application Form and check
via an overnight delivery service (such as FedEx),  delivery cannot be made to a
post office. In that case, you should use the following address:

     Portfolio 21
     c/o American Data Services, Inc.
     150 Motor Parkway
     Suite 109
     Hauppauge, NY 11788

     BY WIRE. If you are making an initial  investment in the Portfolio,  before
you wire funds you should call the Transfer  Agent at  1-800-282-2340  to advise
them that you are making an investment by wire. The Transfer agent will give you
your account  number.  The Transfer  Agent will ask for your name and the dollar
amount you are investing. You will then receive your account number and an order
confirmation  number.  You should then  complete  the Fund  Account  Application
included  with this  Prospectus.  Include  the date and the  order  confirmation
number on the Account  Application and mail the completed Account Application to
the address at the top of the  Account  Application.  Your bank should  transmit
immediately available funds by wire in your name to:

8
<PAGE>
     UMB Bank, n.a.
     ABA Routing Number: 101000695
     for credit to Portfolio 21
     DDA # 9870912554
     for further credit to [your name and account number]

Your bank may charge you a fee for sending a wire to the Portfolio

     If you are making a  subsequent  purchase,  your bank  should wire funds as
indicated  above.  Before each wire  purchase,  you should be sure to notify the
Transfer  Agent.  IT IS ESSENTIAL  THAT YOUR BANK INCLUDE  COMPLETE  INFORMATION
ABOUT YOUR ACCOUNT IN ALL WIRE INSTRUCTIONS.  If you have questions about how to
invest by wire, you may call the Transfer Agent.  Your bank may charge you a fee
for sending a wire to the Portfolio.

     AUTOMATIC  INVESTMENT  PLAN.  You  may  make  regular  investments  through
automatic periodic deductions from your bank checking or savings account.  Under
this Plan,  after your  initial  investment,  you  authorize  the  Portfolio  to
withdraw  from your  personal  checking or savings  account each month an amount
that you wish to  investment  which must be at least $100. If you wish to invest
on a periodic basis,  when opening your Portfolio account complete the Automatic
Investment  Plan  section  of the  Account  Application  Form and mail it to the
Portfolio at the address listed above.  Current  shareholders  may choose at any
time to  enroll  in the  Automatic  Investment  Plan.  Call  1-800-282-2340  for
instructions.  The Portfolio may terminate or modify this privilege at any time.
You may terminate  your  participation  in the Plan at any time by notifying the
Transfer  Agent in  writing.  Your  termination  letter  must be received by the
Transfer Agent sufficiently in advance of the next scheduled withdrawal.

     RETIREMENT  PLANS.  The Portfolio offers an Individual  Retirement  Account
("IRA") plan. You may obtain information about opening an IRA account by calling
1-800-282-2340.  If you wish to open another  type of  retirement  plan,  please
contact your securities dealer.

HOW TO SELL SHARES

     You may sell  (redeem) your  Portfolio  shares on any day the Portfolio and
the New York Stock Exchange  ("NYSE") are open for business  either  directly to
the Portfolio or through your investment representative.

     BY MAIL. You may redeem your shares by simply sending a written  request to
the Transfer  Agent.  You should give your account  number and state whether you
want all or some of your shares redeemed.  The letter should be signed by all of
the  shareholders  whose  names  appear in the  account  registration.  Call the
Transfer Agent for details. You should send your redemption request to:

     Portfolio 21
     c/o American Data Services, Inc.
     P.O. Box 5536
     Hauppauge, NY 11788-0132

     To protect the Portfolio  and its  shareholders,  a signature  guarantee is
required for all written redemption requests over $100,000.  Signature(s) on the
redemption  request must be guaranteed by an "eligible  guarantor  institution."

                                                                               9
<PAGE>
These 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.

     BY TELEPHONE.  If you complete the  Redemption by Telephone  portion of the
Account  Application,  you may redeem all or some of your  shares by calling the
Transfer Agent at  1-800-282-2340  before the close of trading on the NYSE. This
is normally 4:00 p.m., Eastern time.  Redemption  proceeds will be mailed on the
next business day to the address that appears on the Transfer  Agent's  records.
If you request,  redemption  proceeds  will be wired on the next business day to
the bank account you designated on the Account  Application.  The minimum amount
that may be wired is $1,000.  Wire  charges,  if any, will be deducted from your
redemption  proceeds.  Telephone  redemptions  cannot be made if you  notify the
Transfer  Agent of a change of  address  within 30 days  before  the  redemption
request.  If you  have a  retirement  account,  you may  not  redeem  shares  by
telephone.

     When you establish telephone privileges,  you are authorizing the Portfolio
and its Transfer Agent to act upon the telephone  instructions  of the person or
persons you have designated in your  Application.  Such persons may request that
the shares in your account be redeemed.  Redemption  proceeds  will be mailed to
the address of record on your  account or  transferred  to the bank  account you
have designated on your Account Application.

     Before  executing an instruction  received by telephone,  the Portfolio and
the Transfer Agent will use reasonable  procedures to confirm that the telephone
instructions are genuine.  These procedures will include recording the telephone
call  and  asking  the  caller  for a form of  personal  identification.  If the
Portfolio and the Transfer Agent follow these reasonable  procedures,  they will
not be liable  for any  loss,  expense,  or cost  arising  out of any  telephone
redemption request that is reasonably believed to be genuine.  This includes any
fraudulent  or  unauthorized  request.  The  Portfolio  may  change,  modify  or
terminate  these  privileges  at any  time  upon at least  60  days'  notice  to
shareholders.

     You may  request  telephone  redemption  privileges  after your  account is
opened by calling the Transfer Agent at 1-800-282-2340 for instructions.

     You may have  difficulties in making a telephone  redemption during periods
of  abnormal  market  activity.  If this  occurs,  you may make your  redemption
request in writing.

     Payment of your  redemption  proceeds will be made promptly,  but not later
than seven days after the receipt of your written request in proper form. If you
made your initial  investment by wire,  payment of your redemption  proceeds for
those  shares  will not be made  until one  business  day after  your  completed
Account  Application is received by the Portfolio.  If you did not purchase your
shares with a certified  check or wire,  the Portfolio may delay payment of your
redemption  proceeds  for 15 days from the date of  purchase or until your check
has cleared, whichever occurs first.

     The  Portfolio  may redeem the shares in your  account if the value of your
account is less than $1,000 as a result of redemptions  you have made. This does
not apply to  retirement  plan or  Uniform  Gifts or  Transfers  to  Minors  Act
accounts.  You will be  notified  that the  value of your  account  is less than
$1,000 before the Portfolio makes an involuntary redemption.  You will then have
30 days in which to make an  additional  investment  to bring  the value of your
account to at least $1,000 before the Portfolio takes any action.

10
<PAGE>
     The Portfolio has the right to pay  redemption  proceeds to you in whole or
in part by a distribution of securities from the Portfolio's holdings. It is not
expected that the Portfolio would do so except in unusual circumstances.

     AUTOMATIC WITHDRAWAL PROGRAM. As another  convenience,  you may redeem your
Portfolio  shares through the Automatic  Withdrawal  Program.  If you elect this
method of redemption, the Portfolio will send you a check in a minimum amount of
$100.  You may choose to receive a check each month or  calendar  quarter.  Your
Portfolio  account must have a value of at least $10,000 in order to participate
in this Program.  This Program may be  terminated at any time by the  Portfolio.
You may also elect to terminate your  participation  in this Program at any time
by writing to the Transfer Agent at:

     Portfolio 21
     c/o American Data Services, Inc.
     P.O. Box 5536
     Hauppauge, NY 11788-0132

                           PRICING OF PORTFOLIO SHARES

     The price of the  Portfolio's  shares is based on the Portfolio's net asset
value. This is done by dividing the Portfolio's  assets,  minus its liabilities,
by the number of shares outstanding. The Portfolio's assets are the market value
of  securities  held in its  portfolio,  plus  any cash and  other  assets.  The
Portfolio's liabilities are fees and expenses owed by the Portfolio.  The number
of Portfolio  shares  outstanding is the amount of shares which have been issued
to  shareholders.  The price you will pay to buy Portfolio  shares or the amount
you will receive when you sell your  Portfolio  shares is based on the net asset
value next  calculated  after your order is received by the Transfer  Agent with
complete  information  and  meeting  all  the  requirements  discussed  in  this
Prospectus.

     The net asset value of Portfolio  shares is  determined  as of the close of
regular trading on the NYSE. This is normally 4:00 p.m., Eastern time. Portfolio
shares will not be priced on days that the NYSE is closed for trading (including
certain U.S. holidays).

                           DIVIDENDS AND DISTRIBUTIONS

     The Portfolio will make  distributions  of dividends and capital gains,  if
any,  annually,  usually on or about  December  31 of each year.  Because of its
investment  strategies,  the  Portfolio  expects  that  its  distributions  will
primarily consist of capital gains.

     You  can  choose  from  three  distribution   options:   (i)  reinvest  all
distributions in additional Portfolio shares; (2) receive distributions from net
invest income in cash or by automatic  clearing house to a  pre-designated  bank
account while  reinvesting  capital gain  distributions in additional  Portfolio
shares; or (3) receive all distributions in cash or by automatic clearing house.
Call the Transfer Agent at (800) 282-2340 for wire instructions.  If you wish to
change your  distribution  option,  write to the Transfer Agent at Portfolio 21,
c/o American Data  Services,  Inc.,  P.O. Box 5536,  Hauppauge,  NY  11788-0132,
before payment of the distribution. If you do not select an option when you open
your account, all distributions will be reinvested in Portfolio shares. You will
receive a statement  confirming  reinvestment  of  distributions  in  additional
Portfolio  shares  promptly  following  the  quarter  in which the  reinvestment
occurs.

                                                                              11
<PAGE>
TAX CONSEQUENCES

     The Portfolio intends to make distributions of dividends and capital gains.
Dividends  are  taxable to you as ordinary  income.  The rate you pay on capital
gain  distributions  will depend on how long the Portfolio  held the  securities
that generated the gains, not on how long you owned your Portfolio  shares.  You
will be taxed in the same manner  whether you receive your dividends and capital
gain distributions in cash or reinvest them in additional Portfolio shares.

     If you sell your  Portfolio  shares,  it is  considered a taxable event for
you.  Depending on the purchase price and the sale price of the shares you sell,
you may have a gain or a loss on the  transaction.  You are  responsible for any
tax liabilities generated by your transaction.

12
<PAGE>
                                  PORTFOLIO 21,
                       A SERIES OF PROFESSIONALLY MANAGED
                            PORTFOLIOS (THE "TRUST")

For  investors  who want more  information  about the  Portfolio,  the following
document is available free upon request:

STATEMENT  OF  ADDITIONAL  INFORMATION  (SAI):  The SAI provides  more  detailed
information  about the  Portfolio  and is  incorporated  by reference  into this
Prospectus.

You can get free copies of SAI,  request  other  information  and  discuss  your
questions about the Portfolio by contacting the Portfolio at:

                          American Data Services, Inc.
                                  P.O. Box 5536
                            Hauppauge, NY 11788-0132
                            Telephone: 1-800-282-2340

You  can  review  and  copy  information  about  the  Portfolio   including  the
Portfolio's  SAI at the Public  Reference  Room of the  Securities  and Exchange
Commission in  Washington,  D.C. You can obtain  information on the operation of
the Public  Reference  Room by  calling  1-800-SEC-0330.  You can get  text-only
copies:

*    For a fee,  by  writing  to the Public  Reference  Room of the  Commission,
     Washington, DC 20549-6009, or

*    For a fee, by calling 1-800-SEC-0330, or

*    Free   of   charge   from   the    Commission's    Internet    website   at
     http://www.sec.gov.


                                             (The Trust's SEC Investment Company
                                                       Act file no. is 811-5037)


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