OBERWEIS FUND
485BPOS, 2000-04-26
Previous: E-MEDSOFT COM, 8-K/A, 2000-04-26
Next: PEEBLES INC, 10-K405, 2000-04-26



<PAGE>

AS FILED WITH THE SECURITIES AND EXCHANGE            1933 ACT FILE NO. 33-9093

COMMISSION ON APRIL 26, 2000                        1940 ACT FILE NO. 811-4854
==============================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C.  20549
                                   FORM N-1A
                            REGISTRATION STATEMENT
                       UNDER THE SECURITIES ACT OF 1933       [X]

                    Pre-Effective Amendment No.________       [_]

                    Post-Effective Amendment No. 18           [X]
                                    and/or
                            REGISTRATION STATEMENT
                   UNDER THE INVESTMENT COMPANY ACT OF 1940   [X]

                     Amendment No. 20                         [X]

                              THE OBERWEIS FUNDS
              (Exact Name of Registrant as Specified in Charter)


                      c/o Oberweis Asset Management, Inc.

                      951 Ice Cream Drive, Suite 200
                        North Aurora, Illinois 60542
              (Address of Principal Executive Offices, Zip Code)

       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE (800) 323-6166

                               Patrick B. Joyce
                        Oberweis Asset Management, Inc.

                      951 Ice Cream Drive, Suite 200
                        North Aurora, Illinois 60542
                    (Name and Address of Agent for Service)

                                  Copies to:

                               Cathy G. O'Kelly
                       Vedder, Price, Kaufman & Kammholz
                     222 North LaSalle Street, Suite 2600
                           Chicago, Illinois 60601


It is proposed that this filing will become effective (check appropriate box)

       [_]    immediately upon filing pursuant to paragraph (b)

       [X]    on May 1, 2000 pursuant to paragraph (b)

       [_]    60 days after filing pursuant to paragraph (a)(1)

       [_]    on (date) pursuant to paragraph (a)(1)

       [ ]    75 days after filing pursuant to paragraph (a)(2)

       [_]    on (date) pursuant to paragraph (a)(2) of Rule 485

If appropriate, check the following box:

       [_]    This post-effective amendment designates a new effective date
              for a previously filed post-effective amendment
<PAGE>

The Oberweis Funds

Prospectus


May 1, 2000


The Securities and Exchange Commission has not approved or disapproved of these
securities or passed on the accuracy or adequacy of this Prospectus. Any
representation to the contrary is a criminal offense.

www.oberweisfunds.com
<PAGE>

Table of Contents
- --------------------------------------------------------------------------------

<TABLE>
<S>                                                                          <C>
RISK/RETURN SUMMARY.........................................................   1
  Investment Objective of the Portfolios....................................   1
  Main Investment Strategies of the Portfolios..............................   1
  Main Risks of Investing in the Portfolios.................................   2
  Performance Information...................................................   4
  Fees and Expenses.........................................................   7
INVESTMENT OBJECTIVE, PRINCIPAL INVESTMENT STRATEGIES AND RISKS.............   8
  Investment Objective......................................................   8
  Principal Investment Strategies...........................................   8
  Risks.....................................................................  10
  Other Investment Policies and Risks.......................................  11
MANAGEMENT OF THE PORTFOLIOS................................................  13
  Investment Adviser........................................................  13
  Management Expenses.......................................................  14
  Distribution of Shares....................................................  14
OTHER INFORMATION...........................................................  15
  Size of Micro-Cap Portfolio...............................................  15
SHAREHOLDER INFORMATION.....................................................  15
  How to Purchase Shares....................................................  15
  How to Redeem Shares......................................................  17
  Pricing of Fund Shares....................................................  19
  Shareholder Services......................................................  19
DISTRIBUTION AND TAXES......................................................  22
GENERAL INFORMATION.........................................................  24
FINANCIAL HIGHLIGHTS........................................................  25
</TABLE>

                                       i
<PAGE>

RISK/RETURN SUMMARY

The Oberweis Funds (the "Fund") is a no-load mutual fund that consists of
three different portfolios--the Oberweis Mid-Cap Portfolio (the "Mid-Cap Port-
folio"), the Oberweis Emerging Growth Portfolio (the "Emerging Growth
Portfolio"), and the Oberweis Micro-Cap Portfolio (the "Micro-Cap Portfolio").

Investment Objective of the Portfolios

Each Portfolio seeks to maximize capital appreciation.

Main Investment Strategies of the Portfolios

Each Portfolio invests principally in the common stocks of companies that the
investment adviser, Oberweis Asset Management, Inc. ("OAM"), believes have the
potential for significant long-term growth in market value.

Each Portfolio in particular seeks to invest in those companies which OAM con-
siders to have above-average long-term growth potential based on its analysis
of eight factors, which the portfolio manager calls the "Oberweis Octagon."
These factors are:

 1. Extraordinarily rapid growth in revenue. OAM prefers this to be generated
 from internal growth as opposed to acquisitions of other businesses. At
 least 30% growth in revenues in the latest quarter for smaller companies and
 at least 20% growth in revenues in the latest quarter for medium size
 companies.

 2. Extraordinarily rapid growth in pre-tax income. At least 30% growth in
 pre-tax income in the latest quarter for smaller companies and at least 20%
 growth in pre-tax income in the latest quarter for medium size companies.
 There should also be rapid growth in earnings per share.

 3. There should be a reasonable price/earnings ratio in relation to the
 company's underlying growth rate. In order to be considered for investment,
 smaller companies must generally have a price/earnings ratio not more than
 one-half of the company's growth rate, and medium size companies must
 generally have a price/earnings ratio of not more than the company's growth
 rate.

 4. Products or services that offer the opportunity for substantial future
 growth.

 5. Favorable recent trends in revenue and earnings growth, ideally showing
 acceleration.

 6. Reasonable price-to-sales ratio based on the company's underlying growth
 prospects and profit margins.

                                       1
<PAGE>


 7. A review of the company's financial statements, with particular attention
 to footnotes, in order to identify unusual items which may indicate future
 problems.

 8. High relative strength in the market, in that the company's stock has
 outperformed at least 75% of other stocks in the market over the preceding
 twelve months.

OAM considers these eight factors as guidelines for evaluating the many compa-
nies it reviews to identify those companies that have the potential for above-
average long-term growth. Such factors and the relative weight given to each
will vary with economic and market conditions and the type of company being
evaluated. No one factor will justify, and any one factor could rule out, an
investment in a particular company. OAM generally considers companies with a
market capitalization of less than $1 billion as smaller companies and those
companies with a market capitalization between $1 billion and $8 billion as
medium size companies.

For companies that meet the "Oberweis Octagon" investment criteria, each Port-
folio will then consider investment in the securities of those companies as
follows:

The Mid-Cap Portfolio generally invests at least 90% of its assets in the se-
curities of companies with a market capitalization between $500 million and $8
billion at the time of investment.

The Emerging Growth Portfolio generally invests at least 90% of its assets in
the securities of relatively small companies with a market capitalization of
less than $1 billion at the time of investment.

The Micro-Cap Portfolio generally invests at least 90% of its assets in the
securities of very small companies with a market capitalization of $250 mil-
lion or less at the time of investment, many less than $100 million.

Although securities of a particular company may be eligible for purchase by
more than one Portfolio, OAM may determine at any particular time to purchase
a security for one Portfolio but not another.


Main Risks of Investing in the Portfolios

The biggest risk is that the Portfolios' returns may vary, and you could lose
money.

If you are considering investing in any of the Portfolios, remember that they
are designed for long-term investors who seek growth of capital and who can
tolerate the greater risks associated with seeking maximum capital apprecia-
tion through investing in common stocks. There is no guarantee that a
Portfolio will achieve its investment objective.

                                       2
<PAGE>


Equity securities, including common stocks, tend to be more volatile than
other investment choices such as bonds and money market instruments. The value
of the Portfolios' shares will go up and down due to movement of the overall
stock market or of the value of the individual securities held by the Portfo-
lios.

An investment in the Portfolios is not a bank deposit and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other govern-
ment agency.

Small- and Medium-sized Company Risk--Although each Portfolio seeks to reduce
risk by investing in a diversified portfolio, you must realize that investing
in smaller, and often newer, companies involves greater risk than there usu-
ally is with investing in larger, more established companies. The stocks of
small- and medium-sized companies often fluctuate in price to a greater degree
than stocks of larger, more mature companies. Smaller companies may have more
limited financial resources, fewer product lines and less liquid trading mar-
kets for their stocks.

The Emerging Growth Portfolio is subject to small company risk, and this risk
is intensified for the Micro-Cap Portfolio. Small company risk is also a fac-
tor for the Mid-Cap Portfolio, because although its investments are generally
in larger companies than the other Portfolios, its investments are neverthe-
less in small to medium capitalization companies.

Investment Style Risk--There is no assurance that the common stocks of compa-
nies selected using the "Oberweis Octagon" investment criteria will achieve
long-term growth in market value.

                                       3
<PAGE>



Performance Information
The following information illustrates how each Portfolio's performance has
varied over time. The bar charts depict the change in performance from year to
year during the period indicated. Of course, the Portfolios' past performance
does not necessarily indicate how they will perform in the future.

MID-CAP PORTFOLIO

Calendar Year Total Returns*

                                   [LINE CHART]
1997       1998       1999
- ------------------------------
5.40%      22.36%     112.72%

Best Quarter: Fourth Quarter 1999 57.85%

                                 Worst Quarter: Third Quarter 1998 -22.31%

<TABLE>
<CAPTION>
Average Annual Total Returns                                           Life of
for the Periods Ended                                                    Fund
December 31, 1999*                                             1 Year  (9/15/96)
<S>                                                            <C>     <C>
Mid-Cap Portfolio............................................. 112.72%  37.09%
S&P 400 Mid-Cap Index**.......................................  14.72%  22.53%
Russell 2000 Index**..........................................  21.30%  14.17%
S&P 500 Index**...............................................  20.99%  28.33%
</TABLE>
- -----------

*  The Mid-Cap Portfolio deducts a withdrawal charge of .25% of the value of
   the shares redeemed. That amount is used to reimburse the Portfolio for the
   costs it incurs in connection with the Shareholder's liquidation of shares.
   The Bar Chart and average annual total returns do not reflect the deduction
   of the withdrawal charge.

** The S&P 400 Mid-Cap Index is an unmanaged capitalization-weighted index of
   the mid-range sector of the U.S. stock market. The Russell 2000 Index is an
   index of 2000 companies with small market capitalizations. The S&P 500 is
   an unmanaged index of 500 common stocks, heavily weighted towards stocks
   with large market capitalization.

                                       4
<PAGE>



EMERGING GROWTH PORTFOLIO

Calendar Year Total Returns*

                                   [BAR CHART]
1990    1991    1992    1993    1994     1995    1996    1997    1998    1999
- ----    ----    ----    ----    ----     ----    ----    ----    ----    -----
0.41%   87.14%  13.64%  9.71%  -3.51%   42.56%   22.45%  -8.55%  -3.10%  53.18%

<TABLE>
<S>            <C>           <C>  <C>
Best Quarter:  First Quarter 1991 43.85%
</TABLE>
<TABLE>
<S>             <C>           <C>  <C>
Worst Quarter:  Third Quarter 1990 -31.91%
</TABLE>

<TABLE>
<CAPTION>
Average Annual Total Returns for the Periods Ended                 5      10
December 31, 1999*                                        1 Year Years  Years
<S>                                                       <C>    <C>    <C>
Emerging Growth Portfolio................................ 53.18% 18.83% 18.27%
Russell 2000 Index**..................................... 21.30% 16.69% 13.41%
S&P 500 Index**.......................................... 20.99% 28.54% 18.22%
</TABLE>
- ------------

*   When first organized in 1987, the Emerging Growth Portfolio applied a
    sales charge to each share purchased. The sales charge was eliminated on
    December 31, 1991. The Bar Chart and the average annual total returns for
    the Emerging Growth Portfolio do not reflect the load.

**  The Russell 2000 Index is an index of 2000 companies with small market
    capitalizations and represents a portfolio that is somewhat similar in
    average market capitalization to the stocks held by the Emerging Growth
    Portfolio. The S&P 500 is an unmanaged index of 500 common stocks, heavily
    weighted towards stocks with large market capitalization.

                                       5
<PAGE>


MICRO-CAP PORTFOLIO

Calendar Year Total Returns*


                                   [BAR CHART]
1996       1997       1998       1999
- ----       ----       ----       ----
22.80%     10.67%     4.34%      19.46%

Best Quarter: Fourth Quarter 1998 39.16%

                                 Worst Quarter: Third Quarter 1998 -25.29%

<TABLE>
<CAPTION>
Average Annual Total Returns                                            Life of
for the Periods Ended                                                     Fund
December 31, 1999*                                              1 Year  (1/1/96)
<S>                                                             <C>     <C>
Micro-Cap Portfolio............................................ 19.46%   14.08%
Russell 2000 Index**........................................... 21.30%   13.92%
</TABLE>
- ------------

*   The Micro-Cap Portfolio deducts a withdrawal charge of .25% of the value
    of the shares redeemed. That amount is used to reimburse the Portfolio for
    the costs it incurs in connection with the Shareholder's liquidation of
    shares. The Bar Chart and the average annual total returns do not reflect
    the deduction of the withdrawal charge.

**  The Russell 2000 Index is an index of 2000 companies with small market
    capitalizations and represents a portfolio that is somewhat similar to the
    stocks held by the Micro-Cap Portfolio.

                                       6
<PAGE>


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

<TABLE>
<CAPTION>
                                                               Portfolio
                                                         ---------------------
Shareholder Fees(1) (Fees paid directly                  Mid-  Emerging Micro-
from your investments)                                    Cap   Growth   Cap
- ---------------------------------------                  ----- -------- ------
<S>                                                      <C>   <C>      <C>
Sales Charge Imposed on Purchases.......................  None   None    None
Sales Charge Imposed on Reinvested Dividends or Capital
  Gain Distributions....................................  None   None    None
Redemption Fees (as a percentage of amount redeemed, if
  applicable)...........................................  .25%   None    .25%
Exchange Fees...........................................  None   None    None
<CAPTION>
Annual Fund Operating Expenses (Expenses
that are deducted from Fund assets)
- ----------------------------------------
<S>                                                      <C>   <C>      <C>
As a percentage of average net assets (net of expense
  reimbursement, if applicable)
Advisory and Management Fees............................  .80%   .83%   1.00%
12b-1 Fees..............................................  .25%   .25%    .25%
Other Expenses.......................................... 1.38%   .51%    .92%
                                                         -----  -----   -----
Total Fund Operating Expenses(2)........................ 2.43%  1.59%   2.17%
Less: Expense Reimbursement and earnings credits........  .43%    .01    .17%
                                                         -----  -----   -----
Net Fund Operating Expenses(2).......................... 2.00%  1.58%   2.00%
                                                         =====  =====   =====
</TABLE>
- ------------
  (1) Investment dealers and other firms may independently charge additional
fees for shareholder transactions or for advisory services; please see their
materials for details.

  (2) OAM has a contractual arrangement with each Portfolio to reimburse each
Portfolio for total operating expenses in excess of 2% of average daily net
assets for the first $25,000,000; plus 1.8% of the next $25,000,000; plus 1.6%
of average daily net assets in excess of $50,000,000. The contractual arrange-
ment continues in force from year to year provided such arrangement is
approved at least annually by the Board of Trustees.

                                       7
<PAGE>

Example

This example is intended to help you compare the cost of investing in the
Portfolios with the cost of investing in other mutual funds. The example as-
sumes that you invest $10,000 in each of the Portfolios for the time periods
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 Portfolios' operating expenses remain the same (except for one year of net
expense in each period). Although your actual costs may be higher or lower,
based on these assumptions your costs would be:

<TABLE>
<CAPTION>
                                                     1 Yr. 3 Yrs. 5 Yrs. 10 Yrs.
                                                     ----- ------ ------ -------
<S>                                                  <C>   <C>    <C>    <C>
Mid-Cap Portfolio................................... $229   $744  $1,285 $2,766
Emerging Growth Portfolio........................... $162   $502  $  866 $1,889
Micro-Cap Portfolio................................. $229   $690  $1,178 $2,523
</TABLE>

There is a .25% withdrawal charge on the Mid-Cap and Micro-Cap Portfolios,
which is deducted from the redemption proceeds and is used to reimburse the
Portfolio for the costs it incurs in connection with the shareholder's liqui-
dation of shares. In addition, for each Portfolio, there is a $6 fee for each
wire redemption (but not for electronic funds transferred via ACH or payment
by check), which is deducted from a shareholder's redemption amount.

INVESTMENT OBJECTIVE, PRINCIPAL INVESTMENT STRATEGIES AND RISKS

Investment Objective
Each Portfolio's investment objective is to maximize capital appreciation.
The Portfolios' investment adviser, OAM, will not generally seek the realiza-
tion of current income in the selection of securities for investment, and the
Portfolios are not designed for investors seeking income rather than capital
appreciation. Income realized on the Portfolios' investments is incidental to
their objectives. The investment objective of each Portfolio is a fundamental
policy and may not be changed without approval of the shareholders of that
Portfolio.

Principal Investment Strategies

In managing each of the Portfolios, OAM seeks out companies that it believes
have the potential for significant long-term growth in market value.

Each Portfolio in particular seeks to invest in those companies which OAM con-
siders to have above-average long-term growth potential based on its analysis
of eight factors, which the portfolio manager calls the "Oberweis Octagon."
These factors are:

 1. Extraordinarily rapid growth in revenue. OAM prefers this to be generated
 from internal growth as opposed to acquisitions of other

                                       8
<PAGE>


 businesses. At least 30% growth in revenues in the latest quarter for
 smaller companies and at least 20% growth in revenues in the latest quarter
 for medium size companies.

 2. Extraordinarily rapid growth in pre-tax income. At least 30% growth in
 pre-tax income in the latest quarter for smaller companies and at least 20%
 growth in pre-tax income in the latest quarter for medium size companies.
 There should also be rapid growth in earnings per share.

 3. There should be a reasonable price/earnings ratio in relation to the
 company's underlying growth rate. In order to be considered for investment,
 smaller companies must generally have a price/earnings ratio not more than
 one-half of the company's growth rate, and medium size companies must gener-
 ally have a price/earnings ratio of not more than the company's growth rate.

 4. Products or services that offer the opportunity for substantial future
 growth.

 5. Favorable recent trends in revenue and earnings growth, ideally showing
 acceleration.

 6. Reasonable price-to-sales ratio based on the company's underlying growth
 prospects and profit margins.

 7. A review of the company's financial statements, with particular attention
 to footnotes, in order to identify unusual items which may indicate future
 problems.

 8. High relative strength in the market, in that the company's stock has
 outperformed at least 75% of other stocks in the market over the preceding
 twelve months.

OAM considers these eight factors as guidelines for evaluating the many compa-
nies it reviews to identify those companies that have the potential for above-
average long-term growth. Such factors and the relative weight given to each
will vary with economic and market conditions and the type of company being
evaluated. No one factor will justify, and any one factor could rule out, an
investment in a particular company. OAM generally considers companies with a
market capitalization of less than $1 billion as smaller companies and those
companies with a market capitalization between $1 billion and $8 billion as
medium size companies.

For companies that meet the "Oberweis Octagon" investment criteria, each Port-
folio will then consider investment in the securities of those companies as
follows:

The Mid-Cap Portfolio generally invests at least 90% of its assets in the se-
curities of companies with a market capitalization between $500 million and $8
billion at the time of investment.


                                       9
<PAGE>


The Emerging Growth Portfolio generally invests at least 90% of its assets in
the securities of relatively small companies with a market capitalization of
less than $1 billion at the time of investment.

The Micro-Cap Portfolio generally invests at least 90% of its assets in the
securities of very small companies with a market capitalization of $250 mil-
lion or less at the time of investment, many less than $100 million.

Although securities of a particular company may be eligible for purchase by
more than one Portfolio, OAM may determine that at any particular time it is
appropriate to purchase a security for one Portfolio but not another. In addi-
tion, OAM may make transactions in a particular security at different times
and different prices for each Portfolio.

Risks

The biggest risk is that the Portfolios' returns may vary, and you could lose
money by investing in the Portfolios.

Because the Portfolios may invest substantially all of their assets in common
stocks, the main risk is that the value of the stocks they hold might decrease
in response to the activities of an individual company or in response to gen-
eral market and/or economic conditions. If this occurs, a Portfolio's share
price may also decrease.

The Portfolios are designed for long-term investors who can accept the risks
involved in seeking maximum capital appreciation through investing in common
stocks. Accordingly, each Portfolio discourages short-term trading in its
shares. Because the Portfolio's investment policies emphasize capital appreci-
ation, as opposed to dividend income, each Portfolio may be considered to be
an investment of above average risk. Each Portfolio is not intended to consti-
tute a balanced investment program. Dividends are expected to be minimal and
there can be no assurance that a Portfolio's objective will be met.

An investment in the Portfolios is not a bank deposit and is not insured or
guaranteed by the Federal Deposit Insurance Corporation or any other govern-
ment agency.

Small- and Medium-sized Company Risk--Although each Portfolio seeks to reduce
risk by investing in a diversified portfolio, investors should also realize
that the very nature of investing in small, and often newer, companies in-
volves greater risk than there usually is with larger, more established
companies. Smaller and newer companies often have limited product lines, mar-
kets, management personnel, research and/or financial resources. The
securities of small companies, which may be thinly capitalized, may not be as
marketable as those of larger companies. Therefore the securities of these
smaller, newer companies may be subject to more abrupt or erratic market move-
ments than the securities of larger companies or the market averages in
general.

                                      10
<PAGE>


The Emerging Growth Portfolio is subject to small company risk, and this risk
is intensified for the Micro-Cap Portfolio. Small company risk is also a fac-
tor for the Mid-Cap Portfolio, because although its investments are generally
in larger companies than the other Portfolios, its investments are neverthe-
less in small to medium capitalization companies.

Investment Style Risk--There is no assurance that the common stocks of compa-
nies selected using the "Oberweis Octagon" investment criteria will achieve
long-term growth in market value.

Other Investment Policies and Risks

Although each of the Portfolios may invest substantially all of its assets in
common stocks, each Portfolio may also invest in convertible securities, pre-
ferred stocks, securities of foreign issuers (most of which are traded on
United States stock exchanges or listed on NASDAQ), and restricted securities.
In addition, each Portfolio may establish and maintain reserves for temporary
defensive purposes or to enable it to take advantage of buying opportunities.
Each Portfolio's reserves may be held in cash or invested in high quality
money market instruments. The Portfolios may also lend their portfolio securi-
ties, write (sell) call options against investment positions and purchase put
and call options.

Foreign Securities--While investment in foreign companies is not a current fo-
cus of the Portfolios, each Portfolio may invest to a limited extent in
foreign equity and debt securities. Investments in foreign securities may in-
volve greater risks than investments in domestic securities. Foreign
securities tend to be more volatile than domestic securities due to a number
of factors, including fluctuations in currency exchange rates; political, so-
cial or economic instability; and less stringent accounting, disclosure and
financial reporting requirements in some countries.

Restricted Securities and Illiquid Securities--Each Portfolio may invest up to
5% of its total assets in securities that are not readily marketable. These
include repurchase agreements with maturities of seven days or more, and secu-
rities of unseasoned issuers that have been in continuous operation for less
than three years. Each Portfolio also may invest up to 5% of its total assets
in securities where resale is legally or contractually restricted (all of
which are collectively referred to as "restricted securities"). The sale of
restricted securities often takes more time than more liquid securities and
may result in higher selling expenses. Also, a Portfolio may have to dispose
of restricted securities at less desirable prices or at prices lower than the
Portfolio valued the securities. A Portfolio may resell restricted securities
to other institutions. If there is a dealer or institutional trading market in
such securities, these restricted securities may be treated as exempt from
each Portfolio's limitation on illiquid securities.

Temporary Defensive Investments--When OAM believes that market conditions are
unfavorable for profitable investing, or when it is otherwise

                                      11
<PAGE>

unable to locate attractive investment opportunities, a Portfolio's cash or
other similar investments may increase. OAM may also temporarily increase a
Portfolio's cash position to protect its assets or maintain liquidity.

When a Portfolio's investments in cash or similar investments increase, it may
not participate in market advances or declines to the same extent that it
would if the Portfolio remained more fully invested in stocks.

Repurchase Agreements--As a means of earning income on idle cash, each Portfo-
lio may enter into repurchase agreements. This technique involves the purchase
of a security by a Portfolio and a simultaneous agreement by the seller (gen-
erally a bank or dealer) to repurchase the security from the Portfolio at a
specified date or upon demand. These securities involve the risk that the
seller will fail to repurchase the security, as agreed. In that case, a Port-
folio will bear the risk of market value fluctuations until the security can
be sold and may encounter delays and incur costs in liquidating the security.
A Portfolio cannot enter into repurchase agreements in excess of 25% of its
total assets and cannot invest more than 10% of its total assets in restricted
securities, which include repurchase agreements with maturities of seven days
or more.

Lending of Portfolio Securities--To generate additional income, each Portfolio
may lend its portfolio securities to qualified brokers/dealers or institu-
tional investors. Such loans may not exceed 30% of the Portfolio's total
assets measured at the time of the most recent loan. For each loan, the bor-
rower must maintain collateral at the Portfolio's custodian with a value at
least equal to 100% of the current market value of the security loaned.

Options--Each Portfolio may buy put and call options on stocks and stock indi-
ces. An option on a security is a contract that gives the buyer of the option
the right to buy or sell a specific security at a stated price during the op-
tion's term. An option on a securities index is a contract that gives the
buyer of the option the right to receive from the seller cash in an amount
equal to the difference between the index's closing price and the option's ex-
ercise price. Options are considered "derivative" securities and are generally
used to hedge a portfolio against certain market risks, but they may also be
used to increase returns. Using options may decrease returns and increase vol-
atility.

A Portfolio may invest up to 5% of its assets in the purchase of put and call
options. Each Portfolio may also write (sell) covered call options on its
Portfolio securities. The total market of the underlying securities of covered
call options is limited to 50% of the Portfolio's net assets.

                                      12
<PAGE>

MANAGEMENT OF THE PORTFOLIOS

Investment Adviser
Oberweis Asset Management, Inc. ("OAM"), 951 Ice Cream Drive, North Aurora,
Illinois 60542, is the investment adviser to each of the Portfolios and is re-
sponsible for the day-to-day management of their investment portfolios and
other business affairs of the Fund and each of the Portfolios.

OAM began providing the Fund with investment advisory and management services
in October, 1994. Although OAM had not served as the investment adviser to a
mutual fund prior to October, 1994, James D. Oberweis, President of the Fund,
and other officers and employees of OAM have previously been associated with
investment advisers for the Fund and/or other mutual funds. Since October,
1994, OAM has also offered investment advice to institutions and individual
investors regarding a broad range of investment products. Certain OAM employ-
ees serve as officers of the Fund and James D. Oberweis serves as both a
Trustee and officer of the Fund.

OAM furnishes continuous advice and recommendations concerning the Portfolios'
investments. OAM also provides the Fund with non-investment advisory manage-
ment and administrative services necessary for the conduct of the Fund's
business. OAM furnishes the Fund with certain administrative, compliance and
accounting services and provides information and certain administrative serv-
ices for shareholders of the Portfolios. OAM provides these services under a
management agreement, which is separate from the investment advisory agree-
ment. OAM may subcontract with other entities to provide certain shareholder
servicing activities. OAM also provides office space and facilities for the
management of the Fund and pays the salaries and fees of the Fund officers and
the Trustee who is affiliated with OAM.

Portfolio Managers--Each Portfolio's investment objective and policies were
developed by James D. Oberweis ("Mr. Oberweis"), portfolio manager of the
Emerging Growth and the Micro-Cap Portfolios since their inception. James W.
Oberweis is the portfolio manager of the Mid-Cap Portfolio.

Mr. Oberweis, a Trustee and President of the Fund, is also a Director and the
President of OAM, and, together with his family, a controlling shareholder of
OAM. Mr. Oberweis is also a registered options principal and shareholder of
Oberweis.net, Inc. ("Oberweis.net"), the Fund's principal distributor and
shareholder service agent. Mr. Oberweis has an MBA from the University of Chi-
cago and has in excess of 30 years of experience in selecting securities for
investment for private clients. In addition to the Fund, Mr. Oberweis manages
segregated accounts for institutional and

                                      13
<PAGE>


individual investors. James W. Oberweis is a Vice President of the Fund and
OAM and Director and President of Oberweis.net. James W. Oberweis was formerly
a registered representative of The Chicago Corporation from March, 1996
through December, 1996. James W. Oberweis joined OAM in 1995 as a Portfolio
Manager. Prior to joining OAM, James W. Oberweis was a student at the Univer-
sity of Illinois, where he earned a Bachelor of Science degree in Engineering.

Management Expenses

As compensation for its investment advisory services, the Portfolios pay OAM
pursuant to the Investment Advisory Agreement an annual fee which is computed
and accrued daily and paid monthly. OAM receives annual fees of .40% of the
average daily net assets of the Mid-Cap Portfolio, .45% of the average daily
net assets of the Emerging Growth Portfolio on the first $50 million and .40%
on amounts over $50 million, and .60% of the average daily net assets of the
Micro-Cap Portfolio.

As compensation for managing the business affairs and providing certain admin-
istrative services, the Portfolios pay OAM pursuant to the Management
Agreement. Each Portfolio pays OAM a monthly management fee at the annual rate
of .40% of the average daily net assets of the Portfolio, subject to reduction
because of each Portfolio's annual expense limitation.

Each Portfolio also incurs expenses for services not provided and expenses not
assumed by OAM, such as transfer agent and custodian fees and expenses, legal
and auditing fees, printing and mailing costs of sending prospectuses, share-
holder reports and other information to existing shareholders, and independent
Trustees' fees and expenses. The Annual Fund Operating Expenses table lists
the actual advisory and management fees and total operating expenses for each
Portfolio for the most recent fiscal year.

Distribution of Shares

The Fund has appointed Oberweis.net to act as the principal distributor of the
Fund's shares and as the primary shareholder service agent. The Fund pays cer-
tain expenses in connection with the distribution of shares of each Portfolio
under a Rule 12b-1 Plan and a Distribution and Shareholder Service Agreement
between the Fund and Oberweis.net (collectively called the "Plan and Agree-
ment") adopted pursuant to Rule 12b-1 under the Investment Company Act of
1940.

Under the Plan and Agreement, the Fund pays to Oberweis.net a monthly fee at
an annual rate of .25% of each Portfolio's average daily net assets for dis-
tribution and will also reimburse certain out-of-pocket expenses of
Oberweis.net for shareholder services provided to each Portfolio. Because the
fee is continually paid out of the Portfolios' assets,

                                      14
<PAGE>

over time it will increase the cost of your investment and could potentially
cost you more than paying other types of sales charges.

Pursuant to the Plan and Agreement, Oberweis.net may appoint various
broker/dealer firms to assist in providing distribution services for the Fund
and may appoint broker/dealers and other firms (including depository institu-
tions such as commercial banks and savings banks) to provide administrative
services for their clients as shareholders of the Portfolios under related
service agreements.

OTHER INFORMATION

Size of Micro-Cap Portfolio
The Fund anticipates ceasing sales of the Micro-Cap Portfolio to both new
shareholders and existing shareholders when the Portfolio reaches $60 million
in net assets but reserves the right to change this limit in the future. If
sales of the Micro-Cap Portfolio are discontinued, it is expected that exist-
ing shareholders of the Micro-Cap Portfolio would be permitted to reinvest any
dividends or capital gain distributions in additional shares of the Portfolio,
absent highly unusual circumstances.

SHAREHOLDER INFORMATION

How to Purchase Shares

In General--The minimum initial investment for each Portfolio is $1,000 ($500
minimum initial investment per Portfolio for tax-advantaged retirement plans).
You may reduce this $1,000 minimum initial investment by signing up for the
Low Minimum Investment Plan. (See "Shareholder Services.") Additional pur-
chases for all existing accounts must be in amounts of at least $100, except
for reinvestment of dividends and capital gains distributions. The Fund re-
serves the right to change at any time the initial or subsequent investment
minimums, to withdraw the offering or to reject any purchase in whole or part.

You may purchase shares of the Portfolios directly through Oberweis.net or
through a securities broker/dealer or its designated agent, through a bank or
other institution having a sales agreement with Oberweis.net, or by contacting
the Fund's Transfer Agent, Investors Fiduciary Trust Company ("IFTC"). Some
broker/dealers, banks or other institutions may independently impose different
minimum investment amounts for purchases by their customers and/or charge for
their services in purchasing shares of the Portfolios.

Your purchase may be made by check or wire or, if it is a subsequent purchase,
through the Automatic Investment Plan. All purchases must be in U.S. dollars.
Third-party checks, except those not exceeding $10,000 and payable to an ex-
isting shareholder who is an individual (as opposed to, e.g., a corporation or
partnership), credit cards and cash will not be accepted.


                                      15
<PAGE>


Shares of the Fund are offered on a continuous basis. The offering price per
share will be the Net Asset Value ("NAV") per share next determined after the
purchase order is received in proper form by IFTC. (See "Pricing of Fund
Shares" for details on the calculation of the current NAV.)

Purchase by Mail--To make an initial purchase by mail, you must complete and
sign the Account Application and mail it along with a check made payable to
The Oberweis Funds to the following address:

                              The Oberweis Funds
                     c/o Investors Fiduciary Trust Company

                             P.O. Box 219042

                        Kansas City, MO 64121-9042

You may make additional investments to an existing account by sending to the
address above a check along with either the stub from your Portfolio account
confirmation or a note indicating the amount of the purchase, name of the
Portfolio, your account number, and the name(s) in which your account is reg-
istered.

Purchase by Wire--You may also purchase shares by instructing your financial
institution to wire federal funds to the Fund's custodian bank. If you are
opening a new account by wire transfer, you must first call IFTC at 1-800-245-
7311 to request an account number and furnish the name(s) on the account
registration, address, and social security number or taxpayer identification
number. If you have an Account Application, you will be asked to send it by
facsimile machine to IFTC (at 1-816-843-8835), if possible, or mail it immedi-
ately. Otherwise, an Account Application will be mailed to you for you to
complete, sign and return immediately to IFTC. Federal funds are to be wired
according to the following instructions:

                   State Street Bank and Trust Company
                               801 Pennsylvania
                             Kansas City, MO 64105
                                ABA #101003621
             The name of the Portfolio in which you wish to invest
                  The Oberweis Funds' Account No. 8907500742

      Further Credit to: (Your shareholder account number and the name(s)
                     in which your account is registered).

You may make additional investments to your account by wire by just contacting
your financial institution with the wire instructions. You do not have to con-
tact State Street Bank and Trust Company ("State Street Bank") first.

Your financial institution may charge you a fee for sending the wire. Neither
the Fund nor State Street Bank will be responsible for the consequences of de-
lays, including delays in the bank or Federal Reserve wire systems.

                                      16
<PAGE>

How to Redeem Shares

In General--You may redeem shares of the Portfolios by mail, by telephone, or
through your own securities broker/dealer or its designated agent, or bank or
other institution that is recorded for such account, if any (see "How to Pur-
chase Shares"). Because of fluctuations in the value of each Portfolio, the
NAV of shares redeemed may be more or less than your cost. Some
broker/dealers, banks or other institutions may charge you a fee for redeeming
shares of the Portfolios.

Redemption proceeds are normally sent on the business day following the day
the redemption request is received with all required documents in proper form
for redemption amounts of $100,000 or less. Payment by check or the transfer
of redemption proceeds in amounts greater than $100,000, including wire trans-
fers of monies and transfers of monies in connection with sales made pursuant
to the Exchange Privilege, is made within seven days after the redemption re-
quest is received. However, if you sell shares you recently purchased with a
check, we may delay sending you the proceeds until your check has cleared,
which may take up to 15 days.

Account Minimums--Each Portfolio reserves the right to redeem the shares in
your account if its total value falls below $1,000 (below $500 for tax-
advantaged retirement plans) as a result of a redemption. Each Portfolio will
allow you 60 days to make additional investments before the redemption is
processed. Although it is each Portfolio's policy to make payment of redemp-
tion proceeds in cash, if the Fund's trustees determine it to be appropriate,
and subject to certain limitations, a Portfolio may redeem shares by a distri-
bution in kind to you of securities held by the Portfolio.

Redemption by Mail--You may redeem shares by mailing a signed request for re-
demption that includes the account name and number and the number of shares or
dollar amount to be redeemed and the name of the Portfolio. Your request must
be sent to The Oberweis Funds, c/o Investors Fiduciary Trust Company, P.O. Box
219042, Kansas City, Missouri 64121-9042. Some redemption requests may require
signature guarantees (see "Signature Guarantees and Other Documentation").
Your redemption request must be accompanied by share certificates, if any have
been issued. In the case of joint ownership, all owners must sign the redemp-
tion request and all owners must sign any endorsement of share certificates.
Additional documents may be required for redemption of shares held by estates,
trusts, guardianships, corporations, partnerships and other shareholders who
are not individuals. The Fund recommends that all mailed share certificates be
sent by registered or certified mail, return receipt requested.

Redemption by Telephone--If you have elected the telephone redemption option
on your account application, you may redeem your Portfolio shares

                                      17
<PAGE>

by telephoning the Transfer Agent at 1-800-245-7311. Pursuant to the telephone
redemption program, you must authorize the Transfer Agent to rely upon tele-
phone instructions from anyone to redeem the specified number of shares or
dollar amount and to transfer the proceeds according to your pre-designated
instructions. The Transfer Agent uses procedures reasonably designed to con-
firm that instructions communicated by telephone are genuine. The Transfer
Agent requires certain identifying information prior to acting upon instruc-
tions, records all telephone instructions and then sends written confirmation
of telephone instructions. As long as these procedures are reasonably fol-
lowed, neither the Fund nor the Transfer Agent would be liable for any losses
from instructions communicated by telephone even if they are unauthorized or
fraudulent.

Redemption proceeds will be mailed to the shareholder of record in the form of
a check. The proceeds may also be transferred to the shareholder's designated
bank using electronic funds transferred via the Automated Clearing House
("ACH"), or, at the shareholder's request, via wire transfer. Funds trans-
ferred via ACH will normally be transmitted on the business day following the
telephone redemption request for redemption amounts of $100,000 or less.
Transfers via ACH of redemption proceeds in amounts greater than $100,000 will
be transmitted within seven days following the telephone redemption request.
There is no charge for transfers via ACH.

Funds transferred via wire transfer will normally be transmitted on the next
business day following the request. There is a $6 fee for each wire redemp-
tion. Your bank may also charge additional fees for receiving a wire transfer.
Checks issued by mail in response to a telephone redemption request can be is-
sued only up to $50,000 to the registered owner(s) (who must be individuals)
at the address of record which must have been on file for 60 days.

Signature Guarantees and Other Documentation--If redemption proceeds are
$50,000 or less and are to be paid to an individual shareholder of record at
the address of record, a signature guarantee is not required (unless there has
been an address change within 60 days). All other redemption requests and
changes in account application instructions must be guaranteed by a bank, se-
curities broker/dealer, municipal securities broker/dealer, government
securities broker/dealer, credit union, member firm of a national securities
exchange, registered securities association or clearing agency, and/or savings
association. A signature guarantee cannot be provided by a notary public. If
you live outside the United States, a foreign bank properly authorized in your
country of residence or a U.S. consulate may be able to authenticate your sig-
nature.

When a signature guarantee is required, the signature of each shareholder of
record must be guaranteed. A redemption request for shares held by a
corporation, trust, partnership, agent or fiduciary must be signed by an

                                      18
<PAGE>

appropriately authorized person and include additional documents to verify the
authority of the person seeking redemption, such as a certified by-law provi-
sion or resolution of the board of directors or trustees of the shareholder
and/or a copy of the governing legal instrument. Any person requiring informa-
tion on redemption procedures may call the Transfer Agent at 1-800-245-7311.

Pricing of Fund Shares
All purchases, redemptions and exchanges will be processed at the NAV next
calculated after your request is received and accepted by the Fund (or the
Fund's agent or authorized designee). NAV per share is computed by dividing
the value of the Portfolio's net assets (i.e., the value of its assets less
liabilities) by the total number of shares then outstanding. Each Portfolio's
investments are valued based on market value or, where quotations are not
readily available, on fair value as determined in good faith by the Board of
Trustees.

If your order in proper form is received (see "How to Purchase Shares" and
"How to Redeem Shares") by the Transfer Agent or Oberweis.net by the close of
trading on the New York Stock Exchange ("NYSE") on a given day (currently 3:00
p.m., Central Time), or by a securities broker/dealer or its designated agent,
a bank or other institution having a sales agreement with Oberweis.net by the
close of trading on the NYSE, Portfolio shares will be purchased or sold at
the next computed NAV. The NAV of the shares of each Portfolio is computed
once daily, as of the later of the close of the NYSE or the Chicago Board Op-
tions Exchange ("CBOE"), on each day the NYSE is open for trading. For
purposes of computing the NAV, all securities in a Portfolio other than op-
tions are priced as of the close of trading on the NYSE. The options in the
Portfolios are priced as of the close of trading on the CBOE.

Shareholder Services
General Information--In addition to the purchase and redemption services de-
scribed above, the Fund offers its shareholders the special accounts and
services described below. You may obtain applications and information about
any shareholder services by calling 1-800-245-7311.

When you make an initial investment in a Portfolio, a shareholder account is
opened for you in accordance with the Portfolio's Account Application instruc-
tions. After each transaction for your account, you will be sent a
confirmation. This includes all deposits, purchases, reinvestments, redemp-
tions, withdrawal payments, and other transactions in your account.

The Portfolios will generally not issue certificates for their shares. Certif-
icates for full share amounts only will be issued upon a shareholder's written
request to the Transfer Agent. In all events fractional shares will be carried
on the books of a Portfolio without the issuance of certificates.

                                      19
<PAGE>

You will be the record owner of all shares in your account with full share-
holder rights, whether or not share certificates are issued to you. Certain of
the functions performed by the Fund in connection with the operation of the
accounts described above will be performed by the Fund's Transfer Agent, IFTC.

Exchange Privilege--All or part of Portfolio shares owned by you may be ex-
changed for shares of any other Portfolio in The Oberweis Funds offering
shares at that time. Your Portfolio shares may also be exchanged for shares of
three money market funds managed by State Street Bank and Trust Company: SSgA
Money Market Fund, SSgA U.S. Government Money Market Fund, and SSgA Tax-Free
Money Market Fund. Each of these money market funds is a portfolio of the SSgA
Funds, an open-end management investment company with a series of multiple
portfolios advised by State Street Bank and Trust Company, 225 Franklin
Street, Boston, MA 02110. You may later then exchange such shares purchased
and shares purchased with reinvested dividends for shares of the Portfolios.
Shares will be exchanged for each other based upon their relative net asset
values except that the Micro-Cap and Mid-Cap Portfolios deduct a withdrawal
charge of .25% of the value of shares redeemed, which deduction also applies
to shares exchanged out of each of those Portfolios.

The SSgA Funds are described in a separate prospectus. You may obtain a copy
of the prospectus for the SSgA Funds by calling 1-800-245-7311 or writing to
951 Ice Cream Drive, North Aurora, Illinois 60542. You are advised to read the
prospectus carefully before authorizing any investment in shares of such fund.
Exchange requests are subject to a $1,000 minimum.

To take advantage of the Exchange Privilege, you must send us a written re-
quest that includes your name, your account number, the name of the Portfolio
you currently own, the name of the Portfolio you wish to exchange into and the
dollar amount or number of shares you wish to exchange. Please remember that
you cannot place any conditions on your request.

If you have any share certificates, you must include them with your request. A
signature guarantee is not required, except in some cases where shares are
also redeemed for cash at the same time. For certificate delivery instructions
and when you need a signature guarantee, please see "Redemption by Mail" under
"How to Redeem Shares."

You may also call us at 1-800-245-7311 unless you have previously notified the
Fund in writing not to effect telephone exchanges. Exchanges made over the
phone may be made by any person, not just the shareholder of record. Please
remember that during unusual market conditions, we may have difficulty in ac-
cepting telephone requests, in which case you should mail your request to our
address. Please see "Purchase by Mail"

                                      20
<PAGE>

for our address. In addition, you may also be able to make exchanges through
certain securities broker/dealers that may charge you a fee for effecting an
exchange.

An exchange of shares is considered a sale for federal income tax purposes.
You may realize a gain or loss depending upon whether the value of the shares
being exchanged is more or less than the adjusted cost basis. As noted above,
the Micro-Cap and Mid-Cap Portfolios deduct a withdrawal charge of .25% of the
value of the shares redeemed, including shares exchanged out of each of the
Portfolios.

Exchanging shares is available only in states where shares of a particular
Portfolio being acquired may legally be sold. The exchange privilege is not a
right and may be suspended, terminated or modified at any time. Except as oth-
erwise permitted by applicable regulations, 60 days' prior written notice of
any termination or material change will be provided.

Low Minimum Initial Investment Plan/Automatic Investment Plan--By completing
the Automatic Investment Plan section of the Account Application, you may make
subsequent investments by authorizing the Fund and its Custodian to debit your
bank account to buy additional shares of the Portfolios. The minimum initial
investment in each Portfolio is $1,000. However, the Low Minimum Initial In-
vestment Plan allows you to open an account with an initial investment of $100
and subsequent monthly investments of $100 or more for at least a one-year pe-
riod.

You can make Automatic Investments either monthly or quarterly, on or about
the 5th or the 20th of the month, in pre-designated amounts of $100 or more.
Funds will be transferred from your designated bank, using electronic funds
transferred via ACH. Initial investments may not be made by the Automatic In-
vestment Plan. The Plan is subject to the approval of the shareholder's bank.
You can stop investing through the Automatic Investment Plan by sending writ-
ten notice to the Fund's Transfer Agent. The notice must be received at least
5 business days prior to the date of your next scheduled automatic purchase.
The Plan is automatically terminated whenever a check is returned unhonored by
your bank. You are responsible for any charges incurred as a result of an
unhonored transaction.

If you cancel the Low Minimum Initial Investment Plan before a one-year peri-
od, the Fund reserves the right to redeem your account if the balance is below
the minimum investment level, currently $1,000. The Fund reserves the right to
terminate or modify the Automatic Investment Plan at any time. See the Account
Application for additional details.

Systematic Withdrawal Account--If you own Portfolio shares with a current NAV
of at least $10,000, you may establish a Systematic Withdrawal Account. By us-
ing this plan, you may have withdrawn from your account

                                      21
<PAGE>

a fixed sum that will be paid to you or a pre-designated third party at regu-
lar intervals.

A Systematic Withdrawal Account cannot be established for you if you own Port-
folio shares for which certificates are outstanding. All share certificates
must be surrendered before beginning systematic withdrawals. See the Account
Application for additional details.

Tax-Advantaged Retirement Plan Accounts--A Portfolio's shares may be purchased
as investments in Individual Retirement Accounts ("IRAs") such as Traditional
IRAs, Roth IRAs, Roth Conversion IRAs, Rollover IRAs and Simplified Employee
Pension Plans (known as SEP-IRAs), and other tax-advantaged retirement plans,
such as Profit Sharing or Money Purchase Pension Plans (known as Keoghs),
401(k) Plans, and 403(b)(7) Plans. Investing in a Portfolio's shares must be
done according to the conditions of the IRA and/or other retirement plan
agreements. You should contact your Plan custodians to determine the eligibil-
ity of the Portfolio's shares as IRA or retirement plan investments.

You may use the Fund's Custodian Bank to establish certain types of retirement
plan accounts, including IRAs, Keoghs and 403(b)(7) Plans in order to purchase
shares of a Portfolio with your retirement funds. Further details, including
fees and charges imposed by the Custodian, are set forth in the Custodian's
information material (account agreement, application, and disclosure state-
ment) which is available from the Fund.

DISTRIBUTION AND TAXES

Taxation of the Portfolios--Because the Fund is a regulated investment compa-
ny, the Portfolios generally pay no federal income tax on the income and gains
that they distribute to you.

Taxation of Shareholders--To avoid taxation, the Internal Revenue Code re-
quires each Portfolio to distribute net income and any net capital gains
realized on its investments annually. A Portfolio's income from dividends and
interest and any net realized short-term gains are paid to shareholders as or-
dinary income dividends. Net realized long-term gains are paid to shareholders
as capital gains distributions. The dividends and capital gain distributions
are normally declared and paid in November.

Dividends and capital gains distributions are automatically reinvested in ad-
ditional shares of the Portfolio, unless you elect to receive them in cash. A
cash election remains in effect until you notify the Transfer Agent in writing
to discontinue such election.

Except for those shareholders exempt from federal income taxes, dividends and
capital gain distributions will be taxable to shareholders, whether paid in
cash or reinvested in additional shares of the Portfolio. You will be notified
annually as to the federal income tax status of divi-

                                      22
<PAGE>

dends and capital gains distributions. Such dividends and distributions may
also be subject to state and local taxes.

Long-term capital gain distributions are taxable as long-term capital gain re-
gardless of how long you have held shares of the Portfolio. Long-term capital
gain distributions (relating to assets held by the Portfolio for more than 12
months) made to individual shareholders are currently taxed at the maximum
rate of 20%. Dividends representing net investment income and net realized
short-term capital gains are taxed as ordinary income at rates up to a maximum
marginal rate of 39.6% for individuals. Any dividends and distributions de-
clared in October, November or December to shareholders of record as of a date
in one of those months and paid during the following January are treated for
federal income tax purposes as paid on December 31 of the calendar year in
which they are declared.

Distribution to Retirement Plans--Fund distributions received by your quali-
fied retirement plan, such as a 401(k) Plan or IRA, are generally tax
deferred. This means that you are not required to report Portfolio distribu-
tions on your income tax return, but, rather, when your plan makes payments to
you. Special rules apply to payments from Roth and Education IRAs.

How Distributions Affect a Portfolio's NAV--Distributions are paid to share-
holders as of the record date of a distribution of a Portfolio, regardless of
how long the shares have been held. Dividends and capital gains awaiting dis-
tribution are included in each Portfolio's daily NAV. The share price of a
Portfolio drops by the amount of the distribution, net of any subsequent mar-
ket fluctuations. You should be aware that distributions from a taxable mutual
fund are not value-enhancing and may create income tax obligations.

"Buying a Dividend"--If you purchase shares of a Portfolio just before the
distribution, you will pay the full price for the shares and receive a portion
of the purchase price back as a taxable distribution. This is referred to as
"buying a dividend." Unless your account is set up as a tax-deferred account,
dividends paid to you will be included in your gross income for tax purposes,
even though you may not have participated in the increase in NAV of the Fund,
whether or not you reinvested the dividends.

Backup Withholding--When you open an account, Internal Revenue Service ("IRS")
regulations require that you provide your taxpayer identification number
("TIN"), certify that it is correct, and certify that you are not subject to
backup withholding under IRS rules. If you fail to provide a correct TIN or
the proper tax certifications, each Portfolio is required to withhold 31% of
all the distributions (including dividends and capital distributions) and re-
demption proceeds paid to you. Each Portfolio is also required to begin backup
withholding on your account if the IRS

                                      23
<PAGE>

instructs it to do so. Amounts withheld are applied to your federal income tax
liability and you may obtain a refund from the IRS if withholding results in
overpayment of taxes.

Foreign Taxes--Dividends, interest, and some capital gains received by the
Portfolios on foreign securities may be subject to tax withholding or other
foreign taxes. The Portfolios may from year to year make the election permit-
ted under section 853 of the Internal Revenue Code to pass through such taxes
to shareholders as a foreign tax credit. If such an election is not made, any
foreign taxes paid or accrued will represent an expense to the Portfolios.

You are advised to consult your own tax adviser as to the tax consequences of
owning shares of each Portfolio with respect to their respective circumstanc-
es.

GENERAL INFORMATION

All inquiries regarding shareholder accounts may be directed to The Oberweis
Funds, c/o Investors Fiduciary Trust Company, P.O. Box 219042, Kansas City,
Missouri 64121-9042 or (800) 245-7311. All other inquiries regarding the Fund
and/or any of the Portfolios should be directed to the Fund at 951 Ice Cream
Drive, Suite 200, North Aurora, Illinois 60542 or (800) 323-6166.

                                      24
<PAGE>

FINANCIAL HIGHLIGHTS
The financial highlights tables are intended to help you understand the Port-
folios' financial performance for the past five years (or for Portfolios with
a performance history shorter than five years, from inception through December
31st of each year shown). Certain information reflects financial results for a
single Portfolio share. The total returns in the tables represent the rate
that an investor would have earned (or lost) on an investment in each of the
Portfolios (assuming reinvestment of all dividends and distributions). This
information has been audited by Ernst & Young LLP, whose report, along with
the Portfolios' financial statements, is included in the Annual Report, which
is available upon request and incorporated by reference into the Statement of
Additional Information.

Mid-Cap Portfolio
<TABLE>
<CAPTION>
                                                                  September
                                Years Ended December                 15,
                                         31,                       1996* -
                                -----------------------------     December
                                 1999        1998       1997      31, 1996
                                -------     ------     ------     ---------
<S>                             <C>         <C>        <C>        <C>
Net asset value at beginning
  of year.....................  $ 12.86     $10.51     $10.29      $10.00
Income (loss) from investment
  operations:
Net investment loss (a).......    (0.31)     (0.21)     (0.19)      (0.05)
Net realized and unrealized
  gain on investments.........    14.22       2.56       0.76        0.34
                                -------     ------     ------      ------
Total from investment opera-
  tions.......................    13.91       2.35       0.57        0.29
Less distributions:
Distribution from net realized
  gain on investments.........    (2.48)        --      (0.35)         --
                                -------     ------     ------      ------
Net asset value at end of
  year........................  $ 24.29     $12.86     $10.51      $10.29
                                =======     ======     ======      ======
Total return (%)..............    112.7       22.4        5.4         2.9 (d)
Ratio/supplemental data:
Net assets at end of year (in
  thousands)..................  $14,085     $6,916     $6,347      $7,295
Ratio of expenses to average
  net assets (%)..............     2.00 (b)   2.00 (b)   2.00 (b)    2.00 (b)(c)
Ratio of net investment loss
  to average net assets (%)...    (1.93)     (1.94)     (1.81)      (1.62)(c)
Portfolio turnover rate (%)...      153         72        106          21 (c)
Average commission rate paid..  $ .0345     $.0305     $.0318      $.0371
</TABLE>
- ------------

(a)  The net investment loss per share data was determined using average
     shares outstanding during the year.

(b)  Net of expense reimbursement from related parties and earnings credit.
     The expense ratios would have been 2.43%, 2.61%, 2.46% and 3.42% for
     1999, 1998, 1997 and 1996, respectively, before expense reimbursement.

(c)  Annualized.

(d)  Not annualized.

*   Commencement of operations.

                                      25
<PAGE>


Emerging Growth Portfolio
<TABLE>
<CAPTION>
                                         Years Ended December 31,
                                -----------------------------------------------
                                  1999     1998      1997      1996      1995
                                --------  -------  --------  --------  --------
 <S>                            <C>       <C>      <C>       <C>       <C>
 Net asset value at beginning
   of year...................   $  23.60  $ 25.71  $  32.86  $  29.09  $  21.41
 Income (loss) from invest-
   ment operations:
 Net investment loss (a).....      (0.41)   (0.33)    (0.37)    (0.32)    (0.33)
 Net realized and unrealized
   gain (loss) on invest-
   ments.....................      12.96    (0.63)    (2.14)     6.73      9.43
                                --------  -------  --------  --------  --------
 Total from investment opera-
   tions.....................      12.55    (0.96)    (2.51)     6.41      9.10
 Less distributions:
 Distribution from net real-
   ized gain on investments..        --     (1.15)    (4.64)    (2.64)    (1.42)
                                --------  -------  --------  --------  --------
 Net asset value at end of
   year......................   $  36.15  $ 23.60  $  25.71  $  32.86  $  29.09
                                ========  =======  ========  ========  ========
 Total return (%)............       53.2     (3.1)     (8.6)     22.5      42.6
 Ratio/supplemental data:
 Net assets at year end (in
   thousands)................   $105,128  $93,115  $139,983  $185,595  $134,663
 Ratio of expenses to average
   net assets (%)............       1.59     1.55      1.44      1.48    1.73(b)
 Ratio of net investment loss
   to average net assets (%).      (1.56)   (1.37)    (1.18)    (0.97)    (1.24)
 Portfolio turnover rate (%).         63       49        75        64        79
 Average commission rate
   paid......................   $  .0305  $ .0280  $  .0337  $  .0413       --
</TABLE>
- ------------

(a)  The net investment loss per share data was determined using average
     shares outstanding during the year.

(b)  Net of expense reimbursement from related parties. Expense ratios would
     have been 1.77% for 1995 before expense reimbursement.

                                      26
<PAGE>


Micro-Cap Portfolio
<TABLE>
<CAPTION>
                                                                        January
                                        Years Ended December            1, 1996*
                                                 31,                       -
                                       -------------------------------  December
                                        1999        1998        1997    31, 1996
                                       -------     -------     -------  --------
<S>                                    <C>         <C>         <C>      <C>
Net asset value at beginning of year.  $ 14.18     $ 13.59     $ 12.28  $ 10.00
Income (loss) from investment
  operations:
Net investment loss (a)..............    (0.28)      (0.24)      (0.21)   (0.15)
Net realized and unrealized gain on
  investments........................     3.04        0.83        1.52     2.43
                                       -------     -------     -------  -------
Total from investment operations.....     2.76        0.59        1.31     2.28
                                       -------     -------     -------  -------
Net asset value at end of year.......  $ 16.94     $ 14.18     $ 13.59  $ 12.28
                                       =======     =======     =======  =======
Total return (%).....................     19.5         4.3        10.7     22.8
Ratio/supplemental data:
Net assets at end of year (in
  thousands).........................  $21,301     $28,290     $36,837  $30,733
Ratio of expenses to average net
  assets (%).........................     2.00 (b)    1.99 (b)    1.81     1.94
Ratio of net investment loss to
  average net assets (%).............    (1.98)      (1.83)      (1.52)   (1.15)
Portfolio turnover rate (%)..........       46          41          89       70
Average commission rate paid.........  $ .0328     $ .0288     $ .0343  $ .0371
</TABLE>
- ------------

(a)  The net investment loss per share data was determined using average
     shares outstanding during the year.

(b)  Net of expense reimbursement from related parties. The expense ratio
     would have been 2.17% and 2.06% for 1999 and 1998, respectively, before
     expense reimbursement.

*   Commencement of operations.

                                      27
<PAGE>

You can obtain additional information about the Fund and its Portfolios. The
Fund's SAI includes more detailed information about each Portfolio and its
investments. The SAI is incorporated herein by reference (legally forms a part
of the prospectus). The Fund's annual and semi-annual reports include a
discussion of the Portfolios' holdings and recent market conditions and the
Portfolios' investment strategies that affected performance.

For a free copy of any of these documents or to request other information or
ask questions about the Fund on any of its Portfolios, call Oberweis at 1-800-
323-6166 or visit Oberweis's Web site at www.oberweisfunds.com.
- -------------------------------------------------------------------------------
The SAI, the Fund's annual and semi-annual reports and other related materials
are available on the SEC's Internet Web Site (http://www.sec.gov). You can
obtain copies of this information upon paying a duplicating fee, by writing
the Public Reference Section of the SEC, Washington, D.C. 20549-6009. You can
also review and copy information about the Fund, including the Fund's SAI, at
the SEC's Public Reference Room in Washington, D.C. Call 1-800-SEC-0330 for
information on the operation of the SEC's Public Reference Room.

          Investment Company Act of 1940, File Number, 811-04854
- -------------------------------------------------------------------------------

Investment Adviser/Manager

Oberweis Asset Management, Inc.

951 Ice Cream Drive, Suite 200

North Aurora, Illinois 60542

1-800-323-6166

Distributor/Shareholder Service Agent

Oberweis.net, Inc.

951 Ice Cream Drive, Suite 200

North Aurora, Illinois 60542

1-630-801-6000

Transfer Agent

Investors Fiduciary Trust Company

1-800-245-7311

Custodian

State Street Bank and Trust Company

Counsel

Vedder, Price, Kaufman & Kammholz

Independent Auditors

Ernst & Young LLP
<PAGE>

                      STATEMENT OF ADDITIONAL INFORMATION

                              THE OBERWEIS FUNDS
                        951 ICE CREAM DRIVE, SUITE 200
                         NORTH AURORA, ILLINOIS 60542
                                (800) 323-6166

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

                      Oberweis Emerging Growth Portfolio
                         Oberweis Micro-Cap Portfolio
                          Oberweis Mid-Cap Portfolio

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

  This Statement of Additional Information ("SAI") pertains to the Portfolios
listed above, each of which is a separate series of The Oberweis Funds, a Mas-
sachusetts business trust.

  The SAI is not a Prospectus and should be read in conjunction with the
Fund's Prospectus dated May 1, 2000, which is incorporated by reference into
this SAI and may be obtained from the Fund at the above address or phone num-
ber. This SAI contains additional and more detailed information about the
Portfolio's operations and activities than the Prospectus. The Annual Report,
which contains important financial information about the Portfolios, is incor-
porated by reference into this SAI and is also available, without charge, at
the above address or phone number.

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

   The date of this Statement of Additional Information is May 1, 2000.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<S>                                                                         <C>
Investment Objective and Policies..........................................   3
Management of the Fund.....................................................   8
Principal Holders of Securities............................................  10
Oberweis Asset Management, Inc.............................................  11
Distribution Plan and Agreement............................................  12
Expenses Borne by the Portfolios...........................................  14
Portfolio Transactions.....................................................  15
Codes of Ethics............................................................  18
Shareholder Services.......................................................  18
Determination of Net Asset Value...........................................  18
Purchases of Shares........................................................  18
Redemption of Shares.......................................................  19
Taxes......................................................................  19
Shareholder Meetings and Voting Rights.....................................  20
Calculation of Average Annual Total Return.................................  21
Additional Information.....................................................  21
</TABLE>

                                       2
<PAGE>

                       INVESTMENT OBJECTIVE AND POLICIES

  The following information supplements the discussion of each Portfolio's in-
vestment objective and policies discussed in the Fund's Prospectus.

Investment Objective

  The investment objective of each Portfolio is to maximize capital apprecia-
tion. Each Portfolio intends to achieve its objective through investing
primarily in common stocks of companies, which in the opinion of its invest-
ment adviser have a potential for above-average long-term growth in market
value. The investment objective of each Portfolio is fundamental and, like all
fundamental policies of a Portfolio, cannot be changed without the affirmative
vote of a majority of the outstanding voting securities of that Portfolio. As
used in this SAI, "a majority of the outstanding voting securities" of the
Portfolio means the lesser of (1) the holders of more than 50% of the out-
standing shares of the Portfolio, or (2) the holders of more than 67% of the
shares of the Portfolio present if more than 50% of the outstanding shares of
the Portfolio are present at a meeting in person or by proxy.

Investment Restrictions

  The policies set forth below are fundamental policies of each Portfolio and
may not be changed without approval of a majority of that Portfolio's out-
standing shares. A Portfolio individually may not:

    1. purchase more than 10% of any class of securities of any one issuer
  other than the United States government and its instrumentalities;

    2. invest more than 5% of its total assets, at the time of the investment
  in question, in the securities of any one issuer (other than the United
  States government and its instrumentalities);

    3. invest more than 5% of its total assets in securities that are not
  readily marketable and securities of unseasoned issuers that have been in
  continuous operation for less than three years, including operating periods
  of their predecessors;

    4. invest more than 5% of its total assets in securities of issuers which
  the Fund is restricted from selling to the public without registration un-
  der the Securities Act of 1933;

    5. invest more than 5% of its total assets in warrants, and of this
  amount, no more than 2% of total assets may be invested in warrants that
  are listed on neither the New York Stock Exchange nor the American Stock
  Exchange;

    6. purchase or retain the securities of any issuer if (i) one or more of-
  ficers or directors of the Fund or the investment adviser individually own
  or would own, directly or beneficially, more than 1/2 of 1% of the securi-
  ties of such issuer, and (ii) in the aggregate, such persons own or would
  own, directly or beneficially, more than 5% of such securities;

    7. purchase, sell or invest in the securities of other investment compa-
  nies;

    8. purchase, sell or invest in interests in oil, gas or other mineral ex-
  ploration or development programs;

    9. purchase, sell or invest in commodities or commodity contracts;

    10. purchase, sell or invest in real estate or interests in real estate,
  except that the Portfolio may purchase, sell or invest in marketable secu-
  rities of companies holding real estate or interests in real estate,
  including real estate investment trusts; provided such investments do not
  exceed 10% of the Portfolio's total assets;

    11. issue senior securities;

    12. invest in companies for the purpose of exercising control or manage-
  ment;

    13. concentrate its investments in any one industry, except that the
  Portfolio may invest up to 25% of its total assets in any one industry;


                                       3
<PAGE>

    14. purchase securities on margin, except that the Portfolio may obtain
  such short-term credits as may be necessary for the clearance of purchases
  and sales of securities;

    15. make short sales of securities unless, at the time of each such sale
  and thereafter while a short position exists, the Portfolio owns an equal
  amount of securities of the same issue or owns securities which, without
  payment by the Portfolio of any consideration, are convertible into, or are
  exchangeable for, an equal amount of securities of the same issue;

    16. participate on a joint or joint and several basis in any trading ac-
  count in any securities;

    17. lend its funds to other persons, except through the purchase of a
  portion of an issue of debt securities publicly distributed;

    18. lend its portfolio securities, unless the borrower is a broker,
  dealer or financial institution that pledges and maintains collateral with
  the Portfolio consisting of cash or securities issued or guaranteed by the
  United States government having a value at all times not less than 100% of
  the value of the loaned securities, provided that the aggregate amount of
  such loans shall not exceed 30% of the Fund's total assets (including value
  of collateral received);

    19. borrow money except from banks as a temporary measure for extraordi-
  nary or emergency purposes or as necessary for the clearance of purchases
  and sales of securities, provided that the aggregate amount of such borrow-
  ing shall not exceed 5% of the value of its total assets at the time of any
  such borrowing, or mortgage, pledge or hypothecate its assets, except in an
  amount not exceeding 5% of its total assets taken at cost to secure such
  borrowing;

    20. engage in the business of underwriting the securities of other is-
  suers; or

    21. invest in puts, calls, straddles or any combination thereof, except
  that the Portfolio may write covered call options on its Portfolio securi-
  ties, the aggregate market value of which is limited to 50% of the
  Portfolio's net assets, and the Portfolio may invest up to 5% of its assets
  in the purchase of put and call options including options on stock indices.

The policies set forth below may be changed by the Fund's Board of Trustees,
all such changes being subject to applicable law. A Portfolio individually may
not:

      1. purchase, sell or invest in interests in oil, gas or other mineral
    leases; or

      2. purchase, sell or invest in limited partnership interests in real
    estate, except that the Portfolio may purchase, sell or invest in mar-
    ketable securities of companies holding real estate or interests in
    real estate, including real estate investment trusts; provided such in-
    vestments do not exceed 10% of the Portfolio's total assets.

  If a percentage restriction is adhered to at the time of investment, a later
change in percentage resulting from changes in values or assets will not be
considered a violation of such restriction nor will a disposition of any secu-
rities be required.

Other Restrictions

  Other investment restrictions are set forth in the Fund's Prospectus and
elsewhere in this SAI. In addition, each Portfolio will not invest more than
10% of its total assets in "restricted securities" (meaning securities the re-
sale of which is legally or contractually restricted, including repurchase
agreements with maturities of seven days or more and securities that are not
readily marketable).

Investment Strategies and Risks

  The following information supplements the discussion of the Portfolios' risk
factors, discussed in the Fund's Prospectus.

                                       4
<PAGE>

  Cash Position. As discussed in the Prospectus, when OAM believes that market
conditions are unfavorable for profitable investing, or when it is otherwise
unable to locate attractive investment opportunities, a Portfolio's cash or
other similar investments may increase. Securities that the Portfolios may in-
vest in as a means of receiving a return on idle cash include U.S. government
obligations, certificates of deposit, commercial paper (rated prime 3 or bet-
ter by Moody's Investor Services, Inc., ("Moody's") or the equivalent),
corporate debt securities (rated A or better by Moody's or Standard & Poor's
Corporation) and repurchase agreements.

  Repurchase Agreements. Each Portfolio may enter into so-called "repurchase
agreements," whereby it purchases a security and the seller (a qualified bank
or securities dealer) simultaneously commits to repurchase that security at a
certain date at an agreed upon price, plus an agreed upon market rate of in-
terest that is unrelated to the coupon rate or date of maturity of the
security. This technique offers a method of earning income on idle cash. In
these transactions, the securities purchased by the Portfolio have, at all
times, a total value in excess of the value of the repurchase agreement and
are held by the Fund's custodian bank until repurchased. Certain costs may be
incurred by a Portfolio in connection with the sale of the securities pur-
chased by it if the seller does not repurchase them in accordance with the
repurchase agreement. The Portfolio will consider on an ongoing basis the
creditworthiness of the institutions with which it enters into repurchase
agreements and will monitor the value of the underlying securities to ensure
that additional securities are deposited by the seller if the value of the se-
curities purchased decreases below the resale price at any time. Under the
Investment Company Act of 1940 (the "1940 Act"), repurchase agreements may be
considered loans by the Portfolio. Each Portfolio is subject to restrictions
on entering into repurchase agreements in excess of 25% of the total assets
and on investing more than 10% of its total assets in restricted securities,
which includes repurchase agreements with maturities of seven days or more.

  Options. Selling (or Writing) Covered Call Options--Each Portfolio may write
(sell) covered call options on its portfolio securities, the aggregate market
value of which underlying securities is limited to 50% of the Portfolio's net
assets. A call option gives the buyer (holder) the right to purchase the un-
derlying security at a specified price (the "exercise price") within a certain
time period. Where the writer (seller) of the option, in this case the Portfo-
lio, already owns the underlying security, the call option is considered to be
"covered." The Portfolio will receive a premium, which is the market value of
the option, when it writes (sells) a call option. The premium provides a par-
tial hedge (protection) against declining prices and enables the Portfolio to
generate a higher return during periods when OAM does not expect the under-
lying security to make any major price moves in the near future but still
deems the underlying security to be, over the long term, an attractive invest-
ment for the Portfolio. In determining whether to write (sell) a covered call
option on one of the Portfolio's securities, OAM will consider the reasonable-
ness of the anticipated premium in relation to the anticipated increase in
market value of the underlying security over the option period. Although the
writing (selling) of covered call options is believed by OAM to be a conserva-
tive investment technique that involves relatively little risk, risks involved
in writing (selling) a covered call option include the possible inability to
effect closing transactions at favorable prices and the inability to partici-
pate in any appreciation of the underlying security above the exercise price
plus premium. The Portfolio may also be exposed to a possible price decrease
in the underlying security that might otherwise have been sold while the Port-
folio continues to hold such underlying security during the option period,
although any such loss during such period would be reduced by the amount of
the premium received. The Portfolios do not consider a security covered by a
call to be "pledged" as that term is used in each Portfolio's investment pol-
icy limiting the pledging or mortgaging of its assets.

  Buying Put and Call Options--Each Portfolio may also invest up to 5% of its
assets in the purchase of put and call options, primarily to minimize princi-
pal fluctuations. The Portfolios may enter into closing transactions, exercise
their options or permit them to expire. The risks involved in purchasing put
or call options include the possible loss of the premium.

  The Portfolios may purchase put options on an underlying security owned by
them. As the holder of a put option, a Portfolio would have the right to sell
the underlying security at the exercise price at any time during the term of
the option. While a Portfolio will not purchase options for leverage purposes,
it may purchase put options for defensive purposes in order to protect against
an anticipated decline (usually short-term) in the

                                       5
<PAGE>

value of its securities. Such hedge protection is provided only during the
life of the put option and only when the Portfolio, as the holder of the put
option, is able to sell the underlying security at the put exercise price re-
gardless of any additional decline in the security's market price. For
example, a put option may be purchased in order to protect unrealized appreci-
ation of a security where the Portfolio deems it desirable to continue to hold
the security. The premium paid for the put option and any transaction costs
would reduce any capital gain otherwise available for distribution when the
security is eventually sold.

  Except as discussed below with respect to options on stock indices, each
Portfolio has no current intention of purchasing put options at a time when
the Portfolio does not own the underlying security; however, it reserves the
right to do so. By purchasing put options on a security it does not own, the
Portfolio would seek to benefit from a decline in the market price of the un-
derlying security. If such a put option is not sold when it has remaining
value, and if the market of the underlying security remains equal to or
greater than the exercise price during the life of the put option, the Portfo-
lio would lose its entire investment in the put option (i.e., the entire
premium paid by the Portfolio). In order for the purchase of a put option to
be profitable, the market price of the underlying security must decline suffi-
ciently below the exercise price to cover the premium and transaction costs,
unless the put option is sold in a closing sale transaction.

  The Portfolios may also repurchase call options previously written on under-
lying securities they already own in order to preserve unrealized gains.

  The Portfolios may also purchase call and put options on stock indices
("stock index options") for the purpose, in part, of partially hedging against
the risk of unfavorable price movements adversely affecting a Portfolio's se-
curities or securities the Portfolio intends to buy and each Portfolio may
sell stock index options in related closing transactions.

  The principal uses of stock index options would be to provide a partial
hedge for a portion of the Portfolios' investment securities, and to offer a
cash management tool. Purchasing stock index options could provide an effi-
cient way to implement a partial decrease in portfolio market exposure in
response to changing market conditions. Although techniques other than the
purchase of options could be used to hedge the Portfolios' investments, the
Portfolios may be able to hedge their exposure more effectively, and perhaps
at a lower cost, through the use of stock index options.

  The Portfolios propose to invest only in stock index options for which the
underlying index is a broad market index such as the Standard & Poor's Index,
the Major Market Index, or the Russell 2000 Index. The Portfolios would pro-
pose to purchase broad stock index options only if they are listed on a
national securities exchange and traded, in the opinion of the Fund's invest-
ment adviser, with some significant volume.

  The Portfolios will not enter into a stock index option if, as a result
thereof, more than five percent (5%) of the Fund's total assets (taken at mar-
ket value at the time of entering into the contract) would be committed to
options, whether options on individual securities or options on stock indices.

  There are several risks in connection with the Portfolios' use of stock in-
dex options as a hedging device. One risk arises because of the imperfect
correlation between movements in the prices of the stock index options and
movements in the prices of securities held by the Portfolios. Successful use
of stock index options by the Portfolios for hedging purposes is also subject
to the Fund's adviser's ability to correctly predict movements in the direc-
tion of the market. In addition, due to market distortions, the price
movements of the stock index options might not correlate perfectly with price
movements in the underlying stock index. Increased participation by specula-
tors in the options market might also cause temporary price distortions.

  The ability to establish and close out positions on options will be subject
to the liquidity of the index options market. Absence of a liquid market on an
exchange may be due to: (i) insufficient trading interest in certain options;
(ii) restrictions imposed by an exchange on opening transactions or closing
transactions, or both; (iii)

                                       6
<PAGE>

trading halts, suspensions or other restrictions imposed with respect to par-
ticular classes or series of options, or underlying securities; (iv) unusual
or unforeseen circumstances, such as severe stock market fluctuations, inter-
rupting normal exchange operations; (v) inadequacy of an exchange's or a
clearing corporation's facilities to handle increased trading volume; or (vi)
discontinuance of the trading of options (or a particular class or series of
options) by an exchange, for economic or other reasons. Higher than antici-
pated trading activity or other unforeseen events also could cause an exchange
or clearing corporation to institute special procedures which may interfere
with the timely execution of customers' orders.

  Stock index options may be closed out only on an exchange which provides a
market for such options. For example, OEX stock index options currently can be
purchased or sold only on the CBOE. Although the Portfolios intend to purchase
or sell stock index options only on exchanges where there appear to be active
markets, there is no assurance that a liquid market will exist for any partic-
ular options contract at any particular time. In such event, it might not be
possible to close a stock index option position.

  Lending of Securities. The Portfolios may lend their investment securities
in an amount up to 30% of its total assets (including value of collateral re-
ceived) to qualified institutional investors who need to borrow securities in
order to complete certain transactions. By lending its investments securities,
a Portfolio attempts to increase its income through the receipt of interest on
the loan. While the securities are being lent, the Portfolios will continue to
receive the equivalent of any dividends or interest paid by the issuer thereof
as well as interest on the collateral. Any gain or loss in the market price of
the securities loaned that might occur during the term of the loan would be
for the account of the Portfolio.

  A Portfolio may lend its portfolio securities to qualified brokers, dealers,
domestic and foreign banks or other financial institutions, so long as the
terms and the structure of such loans are not inconsistent with the 1940 Act,
or the Rules and Regulations or interpretations of the Securities and Exchange
Commission (the "Commission") thereunder, which currently require that (a) the
borrower pledge and maintain with the Portfolio collateral consisting of cash,
an irrevocable letter of credit issued by a domestic U.S. bank, or securities
issued or guaranteed by the U.S. government having a value at all times of not
less than 100% of the value of the securities loaned, (b) the borrower add to
such collateral whenever the price of the securities loaned rises (i.e., the
borrower "marks to the market" on a daily basis), (c) the loan be made subject
to termination by the Portfolio at any time, and (d) the Portfolio receives
reasonable interest on the loan or its collateral (which may include the Port-
folio investing any cash collateral in interest-bearing short-term
investments), any dividends and distributions paid on the loaned securities
and any increase in their market value.

  As with any extension of credit, portfolio security loans involve certain
risks in the event a borrower should fail financially, including delays or in-
ability to recover the loaned securities or foreclosure against the
collateral. Each Portfolio will consider on an ongoing basis the creditworthi-
ness of the borrowers to which it makes portfolio security loans.

  Foreign Securities. Foreign securities involve currency risks. The U.S. Dol-
lar value of a foreign security tends to decrease when the value of the U.S.
Dollar rises against the foreign currency in which the security is denominated
and tends to increase when the value of the U.S. Dollar falls against such
currency. Fluctuations in exchange rates may also affect the earning power and
asset value of the foreign entity issuing the security. Dividend and interest
payments may be repatriated based upon the exchange rate at the time of dis-
bursement or payment, and restrictions on capital flows may be imposed. Losses
and other expenses may be incurred in converting between various currencies.

  Foreign securities may be subject to foreign government taxes that reduce
their attractiveness. Other risks of investing in such securities include po-
litical or economic instability in the country involved, the difficulty of
predicting international trade patterns and the possible imposition of ex-
change controls. The prices of such securities may be more volatile than those
of domestic securities and the markets for such securities may be less liquid.
In addition, there may be less publicly available information about foreign
issuers than about domestic issuers. Many foreign issuers are not subject to
uniform accounting, auditing and financial reporting standards

                                       7
<PAGE>

comparable to those applicable to domestic issuers. There is generally less
regulation of stock exchanges, brokers, banks and listed companies abroad than
in the United States. With respect to certain foreign countries, there is a
possibility of expropriation or diplomatic developments that could affect in-
vestment in these countries.

  Warrants. Each Portfolio may invest no more than 5% of its total assets in
warrants, and of that amount, no more than 2% of total assets may be invested
in warrants that are listed on neither the New York Stock Exchange nor the
American Stock Exchange. Warrants are securities giving the holder the right,
but not the obligation, to buy the stock of an issuer at a given price (gener-
ally higher than the value of the stock at the time of issuance) during a
specified period or perpetually. Warrants may be acquired separately or in
connection with the acquisition of securities. Warrants do not carry with them
the right to dividends or voting rights with respect to the securities that
they entitle their holder to purchase and they do not represent any rights in
the assets of the issuer. As a result, warrants may be considered to have more
speculative characteristics than certain other types of investments. In addi-
tion, the value of a warrant does not necessarily change with the value of the
underlying securities and a warrant ceases to have value if it is not exer-
cised prior to its expiration date.

  Real Estate Investment Trusts. Each Portfolio may invest in real estate in-
vestment trusts ("REITs"). REITs are subject to volatility from risks
associated with investments in real estate and investments dependent on income
from real estate, such as fluctuating demand for real estate and sensitivity
to adverse economic conditions. In addition, the failure of a REIT to continue
to qualify as a REIT for tax purposes would have an adverse effect upon the
value of a Portfolio's investment in that REIT. Each Portfolio may invest no
more than 10% of its total assets in REITs. Each Portfolio does not currently
intend, however, to invest in REITs to the extent that more than 5% of its to-
tal assets will be invested in REITs during the current year.

  Short Sales Against the Box. Each Portfolio may make short sales against the
box for the purpose of deferring realization of gain or loss for federal in-
come tax purposes. A short sale "against the box" is a short sale in which a
Portfolio owns at least an equal amount of the securities sold short or secu-
rities convertible into or exchangeable for, without payment of any further
consideration, securities of the same issue as, and at least equal in amount
to, the securities sold short. Each Portfolio does not currently intend to en-
gage in short sales to the extent that more than 5% of its net assets will be
held as collateral therefor during the current year.

  Arbitrage. The Portfolios have no current intention to engage in arbitrage
(meaning the simultaneous purchase and sale of the same security in different
markets but not on the purchase of call and put options on stock indices).

  Portfolio Turnover. OAM buys and sells securities for each Portfolio to ac-
complish its investment objective. The frequency of portfolio transactions,
the Portfolio's turnover rate, will vary from year to year depending on market
conditions.

  The Emerging Growth Portfolio's turnover during the years ended December 31,
1999 and 1998 was 63% and 49%, respectively; the Micro-Cap Portfolio's turn-
over during the years ended December 31, 1999 and December 31, 1998 was 46%
and 41%, respectively; and the Mid-Cap Portfolio's turnover for the years
ended December 31, 1999 and December 31, 1998 was 153% and 72%, respectively.
A higher portfolio turnover rate (over 100%) may cause the Portfolio to pay
higher transaction expenses, including more commissions and markups, and also
may result in quicker recognition of capital gains, resulting in more capital
gains distributions that may be taxable to Shareholders.

                            MANAGEMENT OF THE FUND

  The business and affairs of the Fund and each of the Portfolios are super-
vised by the Fund's Board of Trustees.

  One of the Fund's trustees and all of its officers are employees and/or of-
ficers of Oberweis Asset Management, Inc. ("OAM"), the Fund's investment
adviser and manager, and/or Oberweis.net, ("Oberweis.net"), the Fund's dis-
tributor and shareholder service agent. OAM is under common control with
Oberweis.net.

                                       8
<PAGE>


  James D. Oberweis, a Trustee and President of the Fund, is the President and
a Director of OAM, and with his wife, Elaine M. Oberweis, and his children, is
a controlling shareholder of OAM. Mr. Oberweis and members of his family own
the majority of the outstanding shares of Oberweis.net.

  The Trustees and officers of the Fund, their ages and their principal occu-
pations during the past five (5) years are:

THOMAS J. BURKE, Trustee (68) **

143 South Lincoln Avenue, Aurora, Illinois 60505; President--Burke Medical As-
sociates, 1968 to present; retired medical physician, practicing medical
physician until November 1, 1995.

DOUGLAS P. HOFFMEYER, Trustee (52) **

550 W. Van Buren, 10th Floor, Chicago, Illinois 60607; Chief Financial Offi-
cer--Eziaz, April, 2000 to present. Vice President--Finance--Teltrend, Inc.
(manufacturer of telecommunications equipment), October, 1986 to April, 2000.

JAMES D. OBERWEIS, Trustee and President (53) *

951 Ice Cream Drive, North Aurora, Illinois 60542; President and Director--
Oberweis Asset Management, Inc., September, 1994 to present; Registered
Options Principal--Oberweis.net, Inc., January, 1997 to present; Senior Vice
President--The Chicago Corporation, October, 1994 to December, 1996; President
of the Fund, 1986 to present; Chairman of the Board of Oberweis Dairy, Inc.

EDWARD F. STREIT, Trustee (64) **

2000 West Galena, Aurora, Illinois 60506; licensed attorney in private prac-
tice, 1962 to present.

PATRICK B. JOYCE, Executive Vice President and Treasurer (40)

951 Ice Cream Drive, North Aurora, Illinois 60542; Executive Vice President,
Secretary and Director--Oberweis Asset Management, Inc., September, 1994 to
present; Executive Vice President and Director--Oberweis.net, Inc., September,
1996 to present; Administrator--The Chicago Corporation, October, 1994 to De-
cember, 1996.

MARTIN L. YOKOSAWA, Vice President (39)

951 Ice Cream Drive, North Aurora, Illinois 60542; Vice President--Oberweis
Asset Management, Inc., September, 1994 to present; Senior Vice President--
Oberweis.net, Inc., January, 1997 to present; Vice President--The Chicago
Corporation, October, 1994 to December, 1996.

JAMES W. OBERWEIS, Vice President (26)

951 Ice Cream Drive, North Aurora, Illinois 60542; Vice President--Oberweis
Asset Management, Inc., May, 1996 to present and Portfolio Manager from Decem-
ber, 1995 to present; President and Director--Oberweis.net, Inc., September,
1996 to present; Registered Representative--The Chicago Corporation, March,
1996 to December, 1996; Student--University of Illinois at Champaign-Urbana,
August, 1991 to December, 1995.

STEVEN J. LE MIRE, Secretary (30)

951 Ice Cream Drive, North Aurora, Illinois 60542; Compliance Manager--
Oberweis.net, Inc., March, 1997 to present; Manager, Shareholder Accounting--
Carr Asset Management, Inc./Indosuez Carr Futures, Inc., March 1994 to March
1997.

                                       9
<PAGE>

NOTE: In some cases a trustee or officer may have held different positions
during the last five years with the employer or employers listed.

  The Fund pays each Trustee of the Fund who is not also affiliated with OAM
and/or Oberweis.net for such services an annual fee of $1,000, plus $1,000 for
each day or part of a day in attendance at a meeting of the Board of Trustees
or one of its Committees.

  The Fund reimburses travel and other expenses incurred by its non-interested
Trustees for each such meeting attended. Trustees and officers of the Fund who
are affiliated with OAM and/or Oberweis.net and officers of the Fund will re-
ceive no compensation or reimbursement from the Fund for acting in those
capacities. However, Trustees and officers of the Fund who are affiliated with
OAM and/or Oberweis.net may directly or indirectly benefit from fees or other
remuneration received from the Fund by OAM and/or Oberweis.net. Regular meet-
ings of the Board of Trustees are held quarterly and the audit committee holds
at least one meeting during each year.
- --------
*  "Interested person" of the Fund as defined in Section 2(a)(19) of the 1940
   Act.
** Member of audit committee and nominating committee.

  The following table sets forth the compensation received by all trustees of
the Fund for the fiscal year ended December 31, 1999.

<TABLE>
<CAPTION>
                                              Pension or
                                              Retirement
                                               Benefits  Estimated
                                  Aggregate   Accrued as   Annual
                                 Compensation  Part of    Benefits
                                   From the      Fund       Upon       Total
Trustee                              Fund      Expenses  Retirement Compensation
- -------                          ------------ ---------- ---------- ------------
<S>                              <C>          <C>        <C>        <C>
Thomas J. Burke.................    $4,000         0          0        $4,000
Douglas P. Hoffmeyer............     4,000         0          0         4,000
James D. Oberweis...............         0         0          0             0
Edward F. Streit................     4,000         0          0         4,000
</TABLE>

                        PRINCIPAL HOLDERS OF SECURITIES

  As of March 31, 2000, the officers and Trustees of the Fund as a group owned
of record or beneficially 2.0%, 5.9% and 4.9% of the then outstanding shares
of the Emerging Growth Portfolio, the Micro-Cap Portfolio and the Mid-Cap
Portfolio, respectively.

  The Fund is aware of the following person(s) owning of record or benefi-
cially more than 5% of the outstanding shares of the respective Portfolios as
of March 31, 2000.

<TABLE>
<CAPTION>
                                                                     Type of
                 Name & Address of Owner                   % Owned  Ownership
- ---------------------------------------------------------- ------- ------------
<S>                                                        <C>     <C>
Emerging Growth Portfolio
 Charles Schwab & Co., Inc.                                 6.9%      Record(1)
 Special Custody Account for Exclusive Benefit of
 Customers
 101 Montgomery Street
 San Francisco, CA 94104

Mid-Cap Portfolio
 R. Bruce Duchossois                                        6.1%   Beneficially
 845 N. Larch Avenue
 Elmhurst, IL 60126
</TABLE>
- --------
(1) Charles Schwab & Company, Inc., a securities broker-dealer, has advised
    the Fund that no individual Person owns more than 5% of the Portfolio.

                                      10
<PAGE>

                        OBERWEIS ASSET MANAGEMENT, INC.

  The Fund's investment adviser, since October 1, 1994, is Oberweis Asset Man-
agement, Inc. ("OAM"), an investment adviser based in North Aurora, Illinois.
For additional details concerning OAM, see the Fund's Prospectus under the
heading "Management of the Portfolios." Pursuant to a written contract between
the Fund and OAM (the "Investment Advisory Agreement"), OAM is responsible for
managing the investment and reinvestment of each Portfolio's assets, determin-
ing in its discretion the securities to be purchased or sold and the portion
of the Portfolio's assets to be held uninvested, providing the Fund with rec-
ords concerning OAM's activities which the Fund is required to maintain under
applicable law, and rendering regular reports to the Fund's Trustees and offi-
cers concerning Portfolio responsibilities. OAM's investment advisory services
to the Fund are all subject to the control of the Trustees, and must be in
compliance with the investment objectives, policies and restrictions set forth
in the Fund's Prospectus and this SAI and with applicable laws and regula-
tions. In addition, OAM is authorized to select broker-dealers, including
Oberweis.net, that may execute purchases and sales of the securities for the
Portfolios. (See "Portfolio Transactions.")

  The investment adviser is obligated to pay the salaries and fees of any of-
ficers of the Fund as well as the Trustees of the Fund who are interested
persons (as defined in the Investment Company Act of 1940) of the Fund, who
are employed full time by the investment adviser to perform services for the
Portfolios under the Investment Advisory Agreement.

  As compensation for its investment advisory services, the investment adviser
receives from the Emerging Growth Portfolio at the end of each month a fee at
an annual rate equal to .45% of the first $50 million of the average daily net
assets of the Portfolio and .40% of the average daily net assets of the Port-
folio in excess of $50 million, from the Micro-Cap Portfolio at the end of
each month a fee at the annual rate of .60% of the average daily net assets of
the Portfolio, and from the Mid-Cap Portfolio at the end of each month a fee
at the annual rate of .40% of the average daily net assets of the Portfolio.

  For the years ended December 31, 1999, 1998 and 1997, the advisory fees in-
curred by the Emerging Growth Portfolio and payable to OAM were $362,142,
$467,203, and $707,165, respectively. For the years ended December 31, 1999,
1998 and 1997, the advisory fees incurred by the Micro-Cap Portfolio and pay-
able to OAM were $120,032, $159,858, and $229,152 respectively. For the years
ended December 31, 1999, 1998 and 1997, the advisory fees incurred by the Mid-
Cap Portfolio and payable to OAM were $32,558, $24,468, and $26,588,
respectively. (See also "Expenses Borne by the Fund.")

  OAM also provides the Fund with non-investment advisory, management and ad-
ministrative services pursuant to a written contract (the "Management
Agreement"). OAM is responsible under the Management Agreement for providing
the Fund with those management and administrative services which are reasona-
bly necessary for conducting the business affairs of the Fund, with the
exception of investment advisory services, and distribution of each Portfo-
lio's shares and shareholder services, which are subject to the Fund's Rule
12b-1 Plan. (See "Distribution Plan and Agreement.") In addition, OAM provides
the Fund with office space and basic facilities for management of the Fund's
affairs, and bookkeeping, accounting, record keeping and data processing fa-
cilities and services.

  OAM is responsible for preparing and updating the Fund's SEC and state reg-
istration statement and filings, tax reports to shareholders and similar
documents. OAM pays the compensation of all officers and personnel of the Fund
for their services to the Fund as well as the Trustees of the Fund who are in-
terested persons of the Fund. OAM also provides information and certain
administrative services to shareholders of each Portfolio. These services in-
clude, among other things, transmitting redemption requests to the Fund's
Transfer Agent and transmitting the proceeds of redemption of shares of the
Fund pursuant to a shareholder's instructions when such redemption is effected
through OAM; providing telephone and written communications with respect to
its shareholders' account inquiries; assisting its shareholders in altering
privileges and ownership of their accounts; and serving as a source of infor-
mation for its existing shareholders in answering questions concerning the
Fund and their transactions with the Fund.

                                      11
<PAGE>

  For its services under the Management Agreement, OAM is paid by the Portfo-
lios on a monthly basis an annual management fee equal to .40% of the average
daily net assets of each Portfolio. OAM will bear all expenses in connection
with the performance of its services to the Fund and each of the Portfolios
under the Management Agreement. The Fund is responsible for all other ex-
penses. However, the Management Agreement provides that OAM is obligated to
reimburse the Portfolios for 100% of the amount by which the Portfolio's ordi-
nary operating expenses during any fiscal year, including the management and
advisory fees, exceed the following amounts expressed as a percentage of the
Portfolio's average daily net assets:

    2.0% of the first $25,000,000; plus
    1.8% of the next $25,000,000; plus
    1.6% of average daily net assets in excess of $50,000,000.

  Excluded from the calculation of ordinary operating expenses are expenses
such as interest, taxes and brokerage commissions and extraordinary items such
as litigation costs. Any such reimbursement is computed and accrued on a daily
and settled on a monthly basis based upon the expenses and average net assets
computed through the last business day of the month. As of the end of the
Fund's fiscal year, the aggregate amounts of reimbursement, if any, by the
Manager to a Portfolio in excess of the amount necessary to limit the operat-
ing expenses on an annual basis to said expense limitation shall be refunded
to the Manager. In no event will OAM be required to reimburse a Portfolio in
an amount exceeding its management and investment advisory fees.

  For the years ended December 31, 1999, 1998 and 1997, the management fees
incurred by the Emerging Growth Portfolio and paid to OAM were $337,142,
$442,202, and $682,165, respectively. For the years ended December 31, 1999,
1998 and 1997, the management fees incurred by the Micro-Cap Portfolio and
paid to OAM were $80,022, $106,572, and $152,768, respectively, and pursuant
to the expense limitation provisions of the Management Agreement, OAM was re-
quired to rebate to the Portfolio $33,669 and $19,321 for the fiscal years
ended December 31, 1999 and 1998, respectively. For the years ended December
31, 1999, 1998 and 1997 the management fees incurred by the Mid-Cap Portfolio
and paid to OAM were $32,558, $24,468, and $26,588, respectively, and pursuant
to the expense limitation provisions of the Management Agreement, OAM was re-
quired to rebate to the Portfolio $30,923, $37,171 and $30,892, respectively.

  While the combined investment advisory fee and management fee paid to OAM is
higher than the total of such fees paid by many other investment companies,
the Fund's Trustees believe that each Portfolio's investment objective and the
"Oberweis Octagon" analysis require greater than average services from OAM,
which, together with the various management and administrative services pro-
vided by OAM, justifies the higher combined fees.

                        DISTRIBUTION PLAN AND AGREEMENT

  As discussed in the Fund's Prospectus under the heading "Distribution of
Shares," the Fund has adopted a Plan of Distribution (the "Distribution Plan")
and a Distribution and Shareholder Service Agreement (the "Distribution Agree-
ment") pursuant to Rule 12b-1 under the 1940 Act (collectively the "Plan and
Agreement") under which the Fund compensates Oberweis.net in connection with
the distribution of each Portfolio's shares. Oberweis.net will act as the pri-
mary distributor of each Portfolio's shares and as the primary shareholder
servicing agent for each Portfolio. The Fund pays Oberweis.net a monthly dis-
tribution fee at an annual rate of .25% of each Portfolio's average daily net
assets and may also reimburse certain out of pocket costs incurred by
Oberweis.net for shareholder services provided to the Fund.

  The Distribution Plan is a "compensation type" plan, which means that
Oberweis.net may receive compensation that is more or less than the actual ex-
penditure made. Oberweis.net is, however, required to provide the Fund with
quarterly listings of all expenditures under the Plan and Agreement.

  Pursuant to the Plan and Agreement, Oberweis.net has agreed, directly or
through other firms, to advertise and promote the Fund and provide information
and services to existing and potential shareholders.

                                      12
<PAGE>

These services include, among other things, processing new shareholder account
applications; converting funds into or advancing federal funds for the pur-
chase of shares of the Fund as well as transmitting purchase orders to the
Fund's Transfer Agent; transmitting redemption requests to the Fund's Transfer
Agent and transmitting the proceeds of redemption of shares of the Fund pursu-
ant to a shareholder's instructions; providing telephone and written
communications with respect to shareholder account inquiries and serving as
the primary source of information for existing and potential shareholders in
answering questions concerning the Fund and their transactions with the Fund;
and providing literature distribution, advertising and promotion as is neces-
sary or appropriate for providing information and services to existing and
potential shareholders.

  Oberweis.net may be reimbursed monthly by each Portfolio for certain out-of-
pocket costs in connection with its services as shareholder service agent,
including such costs as postage, data entry, modification and printout, sta-
tionery, tax forms and all other external forms or printed material, but not
including overhead. Although there is no limitation on the amount of such
costs that may be reimbursed under the Plan and Agreement, such costs must be
actual, out-of-pocket costs, and the total amount of 12b-1 fees, including re-
imbursement of such costs, is included in the total expenses of the Portfolio,
subject to the expense limitation based on average daily net assets of each
Portfolio. Oberweis.net will furnish with each monthly statement for such re-
imbursement a written listing of the expenditures on behalf of each Portfolio
and their purpose. Oberweis.net compensates its account executives for servic-
ing and administering a shareholder's account.

  The Plan and Agreement provides that Oberweis.net may appoint various bro-
ker-dealer firms to assist in providing distribution services for the Fund,
including literature distribution, advertising and promotion, and may appoint
broker-dealers and other firms (including depository institutions such as com-
mercial banks and savings and loan associations) to provide administrative
services for their clients as shareholders of the Fund under related service
agreements. To provide these services, these firms will furnish, among other
things, office space and equipment, telephone facilities, and personnel as is
necessary or beneficial for providing information and services related to the
distribution of the Portfolios' shares to Oberweis.net in servicing accounts
of such firms' clients who own shares of the Fund.

  The Plan provides that the Fund's asset-based sales charges (as defined in
the NASD's Conduct Rules) shall not exceed those permitted by Rule 2830 of the
NASD's Conduct Rules. Further, as permitted by the NASD's Rules, the Emerging
Growth Portfolio has elected to calculate its permissible amount of asset-
based sales charges on new gross sales of the Portfolio since the Portfolio's
inception.

  The Board of Trustees has determined that, in its judgment, there is a rea-
sonable likelihood that the Plan and Agreement will benefit the Portfolios and
their shareholders. If the sizes of the Portfolios are increased rapidly,
fixed expenses will be reduced as a percentage of each shareholder's invest-
ment. The 12b-1 expenses will also provide Oberweis.net and others an
incentive to promote the Portfolios and to offer individual shareholders
prompt and efficient services.

  As required by Rule 12b-1, the Plan, as amended, and Agreement was approved
by the Board of Trustees, including a majority of Trustees who are not inter-
ested persons, as defined in the 1940 Act, of the Fund, who are not parties to
the Distribution and Shareholder Service Agreement and who have no direct or
indirect financial interest in the operation of the Plan.

  Unless terminated earlier as described below, the Plan and Agreement will
continue in effect from year to year if approved annually by the Board of
Trustees of the Fund, including a majority of the Trustees who are not parties
to the Plan and Agreement (or have a direct or indirect financial interest in
the operation thereof) and who are not interested persons of the Fund. The
Plan may be terminated with respect to the Fund or a Portfolio at any time by
(1) a vote of a majority of the Trustees who are not interested persons of the
Fund, who are not parties to the Distribution and Shareholder Service Agree-
ment and who have no direct or indirect financial interest therein, or (2) by
the vote of a majority of shareholders of that Portfolio. The Distribution and
Shareholder Service Agreement may be terminated similarly without penalty upon
60 days written notice by either party and will automatically terminate if as-
signed, as defined in the 1940 Act.

                                      13
<PAGE>


  For the year ended December 31, 1999, total 12b-1 fees paid by the Emerging
Growth Portfolio to Oberweis.net were $210,714. For that period ended December
31, 1999, Oberweis.net paid the following amounts under the Rule 12b-1 Plan in
the approximate amounts noted: $70,792 in sales promotion and literature ex-
penses, $146,107 in service fees paid to brokers, and $10,616 in salary
expenses and employment services. There was no reimbursement of out-of-pocket
expenses for such period.

  For the year ended December 31, 1999, total 12b-1 fees paid by the Micro-Cap
Portfolio to Oberweis.net were $50,013. For that period Oberweis.net paid the
following amounts under the Rule 12b-1 Plan in the approximate amounts noted:
$16,135 in sales promotion and literature expense, $38,850 in service fees
paid to brokers, and $2,441 in salary expenses and employment services. There
was no reimbursement of out-of-pocket expenses for such period.

  For the year ended December 31, 1999, total 12b-1 fees paid by the Mid-Cap
Portfolio to Oberweis.net were $20,349. For that period Oberweis.net paid the
following amounts under the Rule 12b-1 Plan in the approximate amounts noted:
$7,685 in sales promotion and literature expense, $16,959 in service fees paid
to brokers, and $1,110 in salary expenses and employment services. There was
no reimbursement of out-of-pocket expenses for such period.

                       EXPENSES BORNE BY THE PORTFOLIOS

  Other than those expenses payable by OAM and/or Oberweis.net, the Portfolios
will pay all of their expenses, including the following:

    (a) Federal, state and local or other governmental agency taxes or fees
  levied against the Fund.

    (b) Costs, including the interest expense, of borrowing money.

    (c) Brokerage fees and commissions and other transaction costs in
  connection with the purchase or sale of portfolio securities for the
  Portfolios.

    (d) Fees and expenses of the Trustees other than those who are
  "interested persons" (as defined in the 1940 Act) of the Fund.

    (e) Expenses incident to holding meetings of the Fund's Shareholders,
  including proxy solicitations of the Fund or its Board of Trustees
  therefor, and meetings of the Board of Trustees and committees of the Board
  of Trustees.

    (f) Fees and expenses in connection with legal services rendered to the
  Fund, the Board of Trustees of the Fund and duly appointed committees of
  the Board of Trustees of the Fund, including fees and expenses of special
  counsel to those Trustees who are not interested persons of the Fund, and
  litigation.

    (g) Audit and accounting expenses of the independent auditors.

    (h) Custodian and transfer and dividend paying agent fees and expenses
  and shareholder service expenses.

    (i) Fees and expenses related to registering, qualifying and maintaining
  registration and qualification of the Fund and its Shares for distribution
  under federal, state and other laws.

    (j) Fees and expenses incident to the preparation and filing of reports
  with regulatory agencies.

    (k) Expenses of preparing, printing (including typesetting) and mailing
  prospectuses, shareholder reports, proxy materials and notices to
  shareholders of the Fund.

    (l) Premiums for trustee's and officer's liability insurance and
  insurance carried by the Fund pursuant to the requirements of Section 17(g)
  of the 1940 Act, or otherwise required by law or deemed desirable by the
  Board of Trustees.

    (m) Fees and expenses incurred in connection with any investment company
  organization or trade association of which the Fund may be a member.

                                      14
<PAGE>

    (n) Costs and expenses incurred for promotion or advertising of the
  Fund's Shares, but only pursuant to a Plan duly adopted in accordance with
  Rule 12b-1 under the 1940 Act and to the extent that such Plan may from
  time to time provide.

    (o) Expenses related to issuance or redemption of the Portfolios' shares.

  For the fiscal year ended December 31, 1999, total expenses incurred by the
Emerging Growth Portfolio, the Micro-Cap Portfolio and the Mid-Cap Portfolio
were $1,339,724, $434,982 and $198,061, respectively, and the ratio of such
total expenses to the Portfolio's average net asset value was 1.59%, 2.17% and
2.43%, respectively. Pursuant to the expense limitation, OAM was required to
reimburse the Micro-Cap Portfolio and Mid-Cap Portfolio in the amounts of
$33,669 and $30,923, respectively, resulting in net expenses of $400,108 after
earnings credit and a net expense ratio of 2.00% for the Micro-Cap Portfolio
and resulting in net expenses of $162,792 after earnings credit and a net ex-
pense ratio of 2.00% for the Mid-Cap Portfolio.

                            PORTFOLIO TRANSACTIONS

  Decisions with respect to the purchase and sale of portfolio securities on
behalf of the Fund's Portfolios are made by OAM. OAM is authorized to place
orders for securities with various broker-dealers, including Oberweis.net,
subject to the requirements of applicable laws and regulations. OAM may place
a significant portion of the Portfolios' agency orders with Oberweis.net, as
it believes by so doing a Portfolio is able to achieve more control over and
better execution of its orders. Orders for securities transactions are placed
by OAM with a view to obtaining the best combination of price and execution
available. In seeking to achieve the best combination of price and execution,
OAM attempts to evaluate the overall quality and reliability of the broker-
dealers and the services provided, including research services, general
execution capability, reliability and integrity, willingness to take positions
in securities, general operational capabilities and financial condition. How-
ever, the responsibility of OAM to attempt to obtain the best combination of
price and execution does not obligate it to solicit a competitive bid for each
transaction. Furthermore, under the Advisory Agreement, OAM is not obligated
to seek the lowest available cost to the Portfolio, so long as it determines
in good faith that the broker-dealer's commission, spread or discount is rea-
sonable in relation to the value of the execution and research services
provided by such a broker-dealer to the Portfolio, or OAM when viewed in terms
of that particular transaction or its overall responsibilities with respect to
all of its clients, including the Portfolio, as to which it offers advice or
exercises investment discretion.

  OAM, with the prior consent of the Fund's Trustees, may place orders with
affiliated persons of OAM, Oberweis.net or the Fund subject to (i) the provi-
sions of Sections 10(f) and 17(e)(2) of the 1940 Act and Rules 10f-3 and 17e-1
thereunder, Rule 206(3)-2 under the Investment Advisers Act of 1940, Section
11(a) of the Securities Exchange Act of 1934 and Rule 11a2-2(T)(a)(2) thereun-
der and any other applicable laws or regulations, and (ii) procedures properly
adopted by the Fund with respect thereto. The Fund has been advised by OAM
that it may place orders for securities with Oberweis.net, but only when it
believes that the combination of price and execution are comparable to that of
other broker-dealers. OAM, with the prior consent of the Fund's Trustees, may
engage in agency cross transactions subject to (i) the provisions of Section
17(a) of the 1940 Act and Rule 17a-7 thereunder and other applicable laws or
regulations, (ii) the provisions of Section 206 of the Investment Advisers Act
of 1940 and Rule 206(3)-2 thereunder, and (iii) procedures properly adopted by
the Fund with respect thereto.

  OAM has agreed to furnish certain information quarterly to the Fund's Trust-
ees to enable them to evaluate the quality of execution and cost of all orders
executed by Oberweis.net. The Fund requires that OAM, as investment adviser,
record and furnish to the Fund quarterly the following information:

 (A) Exchange Transactions

  A listing showing for each transaction executed by Oberweis.net for the
Portfolios during the month, in time sequence, the date of the transaction,
the price, the commission, the exchange where executed, the security and the
number of shares.

                                      15
<PAGE>

 (B) Over-the-Counter Transactions

  A listing showing for each transaction executed by Oberweis.net for the
Portfolios during the month, in time sequence, the date of execution, the
price, the best bid and ask at the time, the commission for the transaction,
the security and the number of shares.

 (C) Transactions Through Other Brokers

  A list of all transactions during each quarter through other brokers, show-
ing the price and commission for the transaction, and a summary of commission
charges by all other brokers executing transactions for the Portfolios.

  A greater discount, spread or commission may be paid to non-affiliated bro-
ker-dealers that provide research services, which research may be used by OAM
in managing assets of its clients, including the Portfolios. Research services
may include data or recommendations concerning particular securities as well
as a wide variety of information concerning companies, industries, investment
strategy and general economic, financial and political analysis and forecast-
ing. In some instances, OAM may receive research, statistical and/or pricing
services it might otherwise have had to perform itself. However, OAM cannot
readily determine the extent to which net prices or commission rates charged
by most broker-dealers reflect the value of its research, statistical and/or
pricing services. As OAM is the principal source of information and advice to
the Fund and is responsible for managing the investment and reinvestment of
the Portfolios' assets and determining the securities to be purchased and
sold, it is believed by the Fund's management to be in the interests of the
Fund for OAM, in fulfilling its responsibilities to the Fund, to be authorized
to receive and evaluate the research and information provided by other securi-
ties brokers or dealers, and to compensate such brokers or dealers for their
research and information services. Any such information received may be uti-
lized by OAM for the benefit of its other accounts as well, in the same manner
that the Fund might also benefit from information obtained by OAM in perform-
ing services for its other accounts. Although it is believed that research
services received directly or indirectly benefit all of OAM's accounts, the
degree of benefit varies by account and is not directly related to the commis-
sions or other remuneration paid by such account.

  Some brokers and dealers used by OAM provide research and other services de-
scribed above. For the year ended December 31, 1999, the total brokerage
commissions paid by the Portfolios to broker-dealers in transactions identi-
fied hereunder primarily on the basis of research and other services provided
to the Portfolios are as follows: Emerging Growth Portfolio paid $150,884 in
brokerage commissions on securities transactions in the amount of
$144,518,456; the Micro-Cap Portfolio paid $58,354 in brokerage commissions on
securities transactions in the amount of $28,907,964; and the Mid-Cap Portfo-
lio paid $14,776 in brokerage commissions on securities transactions in the
amount of $25,411,728.

  Transactions of the Portfolios in the over-the-counter market and the third
market may be executed for the Portfolios by Oberweis.net as agent with pri-
mary market makers acting as principal, except where OAM believes that better
prices or execution may be obtained otherwise. Transactions with primary mar-
ket makers reflect the spread between the bid and the ask prices.
Occasionally, the Portfolios may make purchases of underwritten issues at
prices which include underwriting discount fees.

  OAM may place orders with broker-dealers other than Oberweis.net that sell
shares of the Fund, provided the price and execution are reasonably believed
to be comparable with other nonaffiliated broker-dealers. OAM and the Fund's
Board of Trustees review quarterly the Portfolios' brokerage transactions for
execution and services furnished.

  For the year ended December 31, 1999, the total brokerage commissions paid
by the Emerging Growth Portfolio was $225,218, of which 1% or $2,530, was to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $122,617,884. One
percent (1%), or $1,252,540 of the securities transactions on which the Port-
folio paid brokerage commissions were effected through Oberweis.net. The total
amount of principal transactions of the Portfolio for the year ended December
31, 1999 for which no commission was incurred was $21,703,205.

  For the year ended December 31, 1998, the total brokerage commissions paid
by the Emerging Growth Portfolio was $170,717, of which 4% or $6,996, was to
Oberweis.net. The total amount of securities transactions

                                      16
<PAGE>


on which the Portfolio paid brokerage commissions during such period was
$87,957,323. Seven percent (7%), or $6,134,123 of the securities transactions
on which the Portfolio paid brokerage commissions were effected through
Oberweis.net. The total amount of principal transactions of the Portfolio for
the year ended December 31, 1998 for which no commission was incurred was
$64,459,102.

  For the year ended December 31, 1997, the total brokerage commissions paid
by the Emerging Growth Portfolio was $324,335, of which 7% or $22,932, was
paid to Oberweis.net. The total amount of securities transactions on which the
Portfolio paid brokerage commissions during such period was $175,019,521.
Eight percent (8%), or $14,706,078, of the securities transactions on which
the Portfolio paid brokerage commissions were effected through Oberweis.net.
The total amount of principal transactions of the Portfolio for the year ended
December 31, 1997 for which no commission was incurred was $114,629,111.

  For the year ended December 31, 1999, the total brokerage commissions paid
by the Micro-Cap Portfolio was $69,119, of which no commissions were paid to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $17,553,392. None of the
securities transactions on which the Portfolio paid brokerage commissions were
effected through Oberweis.net. The total amount of principal transactions of
the Portfolio for the year ended December 31, 1999 for which no commission was
incurred was $11,354,572.

  For the year ended December 31, 1998, the total brokerage commissions paid
by the Micro-Cap Portfolio was $52,563, of which 3% or $1,494, was paid to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $18,181,906. One percent
(1%), or $179,564, of the securities transactions on which the Portfolio paid
brokerage commissions were effected through Oberweis.net. The total amount of
principal transactions of the Portfolio for the year ended December 31, 1998
for which no commission was incurred was $16,131,157.

  For the year ended December 31, 1997, the total brokerage commissions paid
by the Micro-Cap Portfolio was $104,095, of which 2% or $2,187, was paid to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $37,585,593. Three
percent (3%), or $922,165, of the securities transactions on which the Portfo-
lio paid brokerage commissions were effected through Oberweis.net. The total
amount of principal transactions of the Portfolio for the year ended December
31, 1997 for which no commission was incurred was $33,518,813.

  For the year ended December 31, 1999, the total brokerage commissions paid
by the Mid-Cap Portfolio was $21,312, of which 2% or $510, was to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $16,800,475. Four
percent (4%), or $586,051 of the securities transactions on which the Portfo-
lio paid brokerage commissions were effected through Oberweis.net. The total
amount of principal transactions of the Portfolio for the year ended December
31, 1999 for which no commission was incurred was $8,611,252.

  For the year ended December 31, 1998, the total brokerage commissions paid
by the Mid-Cap Portfolio was $10,661, of which no commissions were paid to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $6,682,929. None of the
securities transactions on which the Portfolio paid brokerage commissions were
effected through Oberweis.net. The total amount of principal transactions of
the Portfolio for the year ended December 31, 1998 for which no commission was
incurred was $2,785,147.

  For the year ended December 31, 1997, the total brokerage commissions paid
by the Mid-Cap Portfolio was $17,339, of which 2% or $300, was paid to
Oberweis.net. The total amount of securities transactions on which the Portfo-
lio paid brokerage commissions during such period was $10,738,002. Three
percent (3%), or $288,744, of the securities transactions on which the Portfo-
lio paid brokerage commissions were effected through Oberweis.net. The total
amount of principal transactions of the Portfolio for the year ended December
31, 1997 for which no commission was incurred was $4,594,860.

                                      17
<PAGE>


                              CODE OF ETHICS

  The Fund, OAM, and Oberweis.net have adopted a joint Code of Ethics. Access
Persons (as defined in the Code) are permitted to make personal securities
transactions, subject to requirements and restrictions set forth in such Code
of Ethics. The Code of Ethics contains provisions and requirements designed to
identify and address certain conflicts of interest between personal investment
activities and the interests of investment advisory clients such as those of
the Fund. The Code of Ethics also prohibits certain types of transactions ab-
sent prior approval, imposes time periods during which personal transactions
may not be made in certain securities, and requires the reporting of securi-
ties transactions. Exceptions to these and other provisions of the Code of
Ethics may be granted in particular circumstances after review by appropriate
personnel.

                             SHAREHOLDER SERVICES

  The Fund's Prospectus under the heading Shareholder Information/How to Pur-
chase Shares, How to Redeem Shares and Shareholder Services describes
information in addition to that set forth below. When a shareholder makes an
initial investment in a Portfolio, a shareholder account is opened in accor-
dance with the Fund's Account Application instructions. After each transaction
for the account of a shareholder, confirmation of all deposits, purchases,
reinvestments, redemptions, withdrawal payments, and other transactions in the
shareholder's account will be forwarded to the shareholder.

  A Portfolio will generally not issue certificates for its shares, except
that certificates for full amounts will be issued upon a shareholder's written
request to the Transfer Agent. The investor will be the record owner of all
shares in his account with full shareholder rights, irrespective of whether
share certificates are issued. Certain of the functions performed by the Fund
in connection with the operation of the accounts described above have been
delegated by the Fund to its Transfer Agent.

  In addition to the purchase and redemption services described above, the
Fund offers its shareholders the special accounts and services described in
the Fund's Prospectus. Applications and information about any shareholder
services may be obtained from OAM.

                       DETERMINATION OF NET ASSET VALUE

  See the Fund's Prospectus under the heading Shareholder Information/How to
Purchase Shares and Pricing of Fund Shares, for descriptions of certain de-
tails concerning the determination of Net Asset Value ("NAV"). The NAV of the
shares of the Portfolios are computed once daily, as of the later of the close
of the New York Stock Exchange ("NYSE") or the Chicago Board Options Exchange
("CBOE"), on each day the NYSE is open for trading. All securities in the
Portfolios other than options are priced as of the close of trading on the
NYSE. The options in the Portfolios are priced as of the close of trading on
the CBOE. The NAV per share is computed by dividing the value of the Portfo-
lio's securities plus all other assets minus all liabilities by the total
number of Portfolio shares outstanding. In valuing the Portfolio's securities,
each listed and unlisted security, other than options, for which last sale in-
formation is regularly reported is valued at the last reported sale price
prior to the close of the NYSE. If there has been no sale on such day, the
last reported bid price is used. Options are valued at the last reported bid
price on the primary exchange as of the close of trading on the CBOE. Any un-
listed security for which last sale information is not regularly reported and
any listed debt security which has an inactive listed market for which over-
the-counter market quotations are readily available is valued at the highest
bid price as of the close of the NYSE determined on the basis of reasonable
inquiry. Restricted securities and any other securities or other assets for
which market quotations are not readily available are valued by appraisal at
their fair values as determined in good faith under procedures established by
and under the general supervision and responsibility of the Board of Trustees.
Short-term debt obligations, commercial paper and repurchase agreements are
valued on the basis of quoted yields for securities of comparable maturity,
quality and type or on the basis of amortized cost.

                              PURCHASE OF SHARES

  See the Funds' Prospectus under the heading Shareholder Information/How to
Purchase Shares for detailed information concerning the purchase of shares of
a Portfolio. Shares of the Portfolios are sold at the NAV per share next de-
termined after the purchase order is received in proper form by IFTC.

                                      18
<PAGE>

                             REDEMPTION OF SHARES

  See the Fund's Prospectus under the heading Shareholder Information/How to
Redeem Shares for detailed information concerning redemption of the shares of
a Portfolio. The Fund may suspend the right to redeem shares or postpone the
date of payment for more than seven (7) days for any period during which: (a)
the NYSE is closed, other than weekend and holiday closings, or the Securities
and Exchange Commission determines that trading on the NYSE is restricted; (b)
the Securities and Exchange Commission determines there is an emergency as a
result of which it is not reasonably practical for a Portfolio to sell the in-
vestment securities or to calculate their NAV; or (c) the Securities and
Exchange Commission permits such suspension for the protection of Portfolio's
shareholders. In the case of a suspension of the right of redemption, a share-
holder may either withdraw his request for redemption or receive payment at
the NAV of his shares existing after termination of the suspension.

  Although it is the Fund's present policy to make payment of redemption pro-
ceeds in cash, if the Fund's Trustees determine it to be appropriate,
redemption proceeds may be paid in whole or in part by a distribution in kind
of securities held by the Portfolios, subject to the limitation that, pursuant
to an election under Rule 18f-1 under the 1940 Act, each Portfolio is obli-
gated to redeem shares solely in cash up to the lesser of $250,000 or 1% of
the net asset value of a Portfolio during any 90-day period for any one ac-
count. The value of such securities shall be determined as of the close of
trading of the NYSE on the business day on which the redemption is effective.
In such circumstances, a shareholder might be required to bear transaction
costs to dispose of such securities.

                                     TAXES

  Each of the Portfolios has elected to qualify under Subchapter M of the In-
ternal Revenue Code of 1986, as amended (the "Code"), so that the Portfolio
will not be liable for federal income taxes to the extent that its net invest-
ment income and net realized capital gains are currently distributed to its
shareholders. Each of the Portfolios will qualify for this status as long as
it: (a) derives at least 90% of its gross income from dividends, interest,
gains from the sale or other distribution of securities or foreign currencies,
and certain other investment income including gain from options, futures or
forward contracts; (b) invests in securities that satisfy certain diversifica-
tion requirements; and (c) distributes at least 90% of its net investment
income and net short-term capital gains to its shareholders each year.

  Except for those shareholders exempt from federal income taxes, dividends
and capital gains distributions are taxable to shareholders for purposes of
the federal income tax, whether paid in cash or reinvested in additional
shares of the Portfolio. Dividends from net investment income are taxable to
non-exempt shareholders as ordinary income for federal income tax purposes.
For corporate shareholders, such income dividends may be eligible for the de-
duction for dividends received from domestic corporations. Distribution of
long-term capital gains are taxable to non-exempt shareholders as long-term
capital gains regardless of the length of time that such shareholders have
owned shares in a Portfolio. Short-term capital gain distributions are taxable
to non-exempt shareholders as ordinary income. Losses incurred by such share-
holders on the redemption of shares of a Portfolio held six months or less
will be treated as long-term capital losses to the extent of any capital gains
distributions made by the Portfolio with respect to such shares. Shareholders
will be notified annually as to the federal income tax status of dividends and
capital gains distributions. Such dividends and distributions may also be sub-
ject to state and local taxes.

  Income dividends are taxed as ordinary income at rates up to a maximum of
39.6% for individuals. Long-term capital gain distributions (relating to as-
sets held by a Portfolio for more than 12 months) made to individual
Shareholders are taxable at a maximum rate of 20%. Long-term capital gain dis-
tributions made to corporate Shareholders are taxed at the same rate as
ordinary income is taxed to corporations.

  In order to avoid a 4% excise tax on undistributed amounts, each Portfolio
must declare, by the end of the calendar year, a dividend to shareholders of
record that represents 98% of its net investment income for the calendar year
plus 98% of its capital gain net income for the period from November 1 of the
previous year through October 31 of the current year plus any undistributed
net investment income from the prior calendar year, plus any undistributed
capital gain net income for the one-year period ended October 31 of the prior

                                      19
<PAGE>

calendar year, less any overdistribution in the prior calendar year. Each
Portfolio intends to declare or distribute dividends during the appropriate
periods in an amount sufficient to avoid the 4% excise tax.

  Options, short sales, financial futures contracts and foreign currency
transactions entered into by a Portfolio are subject to special tax rules that
may accelerate income, defer losses, cause adjustments to the holding period
of securities, convert capital gain into ordinary income, and convert short-
term capital loss into long-term capital loss. As a result, these rules could
affect the amount, timing, and character of Portfolio distributions.

  Federal law requires the Fund to withhold 31% from dividends and/or
redemption proceeds (including from exchanges) that occur in certain
shareholder accounts if the shareholder has not properly furnished a certified
correct Taxpayer Identification Number (in the case of individuals, a social
security number) or has not certified that withholding does not apply. Amounts
withheld are applied to the shareholder's federal income tax liability and a
refund may be obtained from the Internal Revenue Service if withholding
results in overpayment of taxes. Federal law also requires the Fund to
withhold the applicable tax treaty rate (as opposed to the statutory rate of
30%) from dividends that are paid to certain nonresident alien, foreign
partnership and foreign corporation shareholder accounts when relevant
withholding certificates are furnished to the Fund.

  The foregoing is a general and abbreviated summary of the applicable
provisions of the Code and Treasury Regulations in effect on the date of the
Fund's Prospectus and this SAI, which provisions are subject to change by
legislative or administrative action. Investors are advised to consult their
own tax advisers regarding the tax consequences of an investment in the
Portfolios. Shareholders are likewise advised to consult their own tax
advisers regarding questions as to state or local taxes.

                    SHAREHOLDER MEETINGS AND VOTING RIGHTS

  As a general rule, the Fund is not required to and will not hold annual or
other meetings of the shareholders. Special meetings of shareholders for
actions requiring a shareholder vote may be requested in writing by holders of
at least twenty-five percent (25%) (or ten percent (10%) if the purpose of the
meeting is to determine if a Trustee is to be removed from office) of the
outstanding shares of the Fund or as may be required by applicable law. Under
the Declaration of Trust, shareholders are entitled to vote in connection with
following matters: (1) for the election or removal of Trustees if a meeting is
called for such purpose; (2) with respect to the adoption of any contract for
which approval is required by the 1940 Act; (3) with respect to any
termination or reorganization of the Portfolios to the extent and as provided
in the Declaration of the Trust; (4) with respect to any amendment of the
Declaration of Trust (other than amendments changing the name of the Fund or
the Portfolios, supplying any omission, curing any ambiguity or curing,
correcting or supplementing any defective or inconsistent provision thereof);
(5) as to whether or not a court action, proceeding or claim should or should
not be brought or maintained derivatively or as a class action on behalf of
the Fund or the shareholders, to the same extent as the stockholders of a
Massachusetts business corporation; and (6) with respect to such additional
matters relating to the Fund as may be required by law, the Declaration of
Trust, the By-Laws of the Fund, or any registration of the Fund with the
Securities and Exchange Commission or any state, or as the Trustees may
consider necessary or desirable. Shareholders will vote in the aggregate,
except when voting by individual Portfolio is required under the 1940 Act or
when the Board of Trustees determines that voting by series is appropriate.
The Declaration of Trust specifically authorizes the Board of Trustees to
terminate the Fund (or any portfolio of the Fund) without shareholder approval
by notice to the shareholders. Each Trustee serves until the next meeting of
shareholders, if any, called for the purpose of electing Trustees and until
the election and qualification of his successor or until such Trustee sooner
dies, resigns, retires or is removed by the majority vote of the shareholders
or by the Trustees.

                                      20
<PAGE>

                  CALCULATION OF AVERAGE ANNUAL TOTAL RETURN

  Average annual total return measures both the net investment income
generated by, and the effect of any realized and unrealized appreciation or
depreciation of, the underlying investments of a Portfolio. A Portfolio's
average annual total return quotation is computed in accordance with a
standardized method prescribed by the rules of the Securities and Exchange
Commission, as follows:

    P(1+T)n=ERV

    Where P=a hypothetical initial payment of $1,000

    T=average annual total return

    n= number of years

    ERV=         ending redeemable value of a hypothetical $1,000 payment
                 made at the beginning of the one-, five-, or 10-year
                 period at the end of the one-, five-, or 10-year period
                 (or fractional portion thereof)

  In advertising, sales literature and other publications, the Portfolios'
performance may be quoted in terms of total return or average annual total
return, which may be compared with various indices and investments, other
performance measures or rankings, or other mutual funds, or indices or
averages of other mutual funds.

                            ADDITIONAL INFORMATION

Fund History

  The Fund is a diversified, open-end management investment company, organized
as a business trust under the laws of Massachusetts on July 7, 1986. The
Fund's Agreement and Declaration of Trust ("Trust Agreement") and the By-Laws
of the Fund are designed to make the Fund similar in many respects to a
corporation. However, under Massachusetts law, shareholders of a business
trust may, under certain circumstances, be held personally liable for the
obligations of the trust, which is not the case in a corporation. The Trust
Agreement provides that shareholders shall not be subject to any personal
liability to any person extending credit to, contracting with or having any
claims against the Fund and that every written agreement, obligation,
instrument or undertaking made by the Fund shall contain a provision that the
same is not binding upon the shareholders personally. Moreover, the Trust
Agreement provides for indemnification out of Fund property for all losses and
expenses of any shareholder held personally liable for the obligations of the
Fund, and the Fund will be covered by insurance which the Trustees believe to
be adequate to cover foreseeable tort claims. Thus, the risk of a shareholder
incurring financial loss on account of shareholder liability is considered
remote.

Shares of the Fund

  Pursuant to the Fund's Trust Agreement, the Fund may issue an unlimited
number of shares of beneficial interest in one or more series of "Portfolios,"
all having no par value. Shares of each Portfolio have equal non-cumulative
voting rights and equal rights with respect to dividends, assets and
liquidation of such Portfolio. Shares are fully paid and non-assessable by the
Fund when issued, are transferable without restriction and have no preemptive
or conversion rights.

Custodian and Transfer Agent

  The Custodian for the Fund is State Street Bank and Trust Company, P.O. Box
219042, Kansas City, Missouri 64142-9042, a Massachusetts trust company. The
Fund has authorized the Custodian to deposit certain securities of the
Portfolios in central depository systems as permitted by federal law. The
Portfolios may invest in obligations of the Custodian and may purchase or sell
securities from or to the Custodian. Investors Fiduciary Trust Company, P.O.
Box 219042, Kansas City, Missouri, a national bank organized under the laws of
the United States and a subsidiary of State Street Bank and Trust Company, is
the Fund's Transfer Agent and acts as a dividend disbursing and redemption
agent for the Fund.

                                      21
<PAGE>

Independent Auditors

  Ernst & Young LLP, 233 South Wacker Drive, Chicago, Illinois 60606, audits
and reports on the Fund's annual financial statements, reviews certain
regulatory reports and prepares the Fund's income tax returns, and performs
other professional accounting, auditing and advisory services when engaged to
do so by the Fund.

Financial Statements

  The audited statements of the Fund, including the notes thereto, contained
in the Annual Report of the Fund for the fiscal year ended December 31, 1999,
were filed with the Securities and Exchange Commission on February 18, 2000
and are incorporated herein by reference.

  Shareholders will receive the Fund's audited annual report and the unaudited
semiannual report.

Counsel

  Vedder, Price, Kaufman & Kammholz, 222 North LaSalle Street, Chicago,
Illinois 60601, is legal counsel to the Fund.

Other Information

  The Fund's Prospectus and this SAI omit certain information contained in the
Registration Statement, which the Fund has filed with the Securities and
Exchange Commission under the Securities Act of 1933, and reference is hereby
made to the Registration Statement for further information with respect to the
Fund and the securities offered hereby. This Registration Statement is
available for inspection by the public at the Securities and Exchange
Commission in Washington, D.C.

                                      22
<PAGE>

                               THE OBERWEIS FUNDS

                           PART C: OTHER INFORMATION


Item 23.  EXHIBITS.

          (a) (1)  Agreement and Declaration of Trust dated July 7, 1986./11/
              (2)  First Amendment to Agreement and Declaration of Trust, dated
                   November 17, 1986./11/

          (b)      By-Laws./11/

          (c)      Not applicable.

          (d) (1)  Management Agreement./5/
              (2)  Amendment to Management Agreement as of February 16, 1994./9/
              (3)  Management Agreement dated October 1, 1994./11/
              (4)  Investment Advisory Agreement./5/
              (5)  Investment Advisory Agreement dated October 1, 1994./11/
              (6)  Transfer and Guaranty Agreement./7/
              (7)  Written Notification required under Investment Advisory
                   Agreement dated October 1, 1994 regarding the rendering of
                   advisory services to the Micro-Cap Portfolio./12/
              (8)  Written Notification required under Investment Advisory
                   Agreement dated October 1, 1994 regarding the rendering of
                   advisory services to the Mid-Cap Portfolio./13/

          (e)      Not applicable.

          (f)      Not applicable.

          (g) (1)  Custodian Agreement./1/
              (2)  Letter Agreements renewing Custodian Agreement dated February
                   24,1988,/3/ February 21, 1989,/4/ February 7, 1990,/5/
                   February 15, 1991,/6/ and February 13, 1992,/7/ respectively.
              (3)  Letter Agreement dated January 27, 1993, renewing Custodian
                   Agreement./8/
              (4)  Custodian Agreement dated August 3, 1993./11/

          (h) (1)  Transfer Agency Agreement./1/

                                      C-1
<PAGE>

            (2)  Letter Agreements renewing Transfer Agency Agreement dated
                 February 24, 1988,/3/ February 21, 1989,/4/ February 7,
                 1990,/5/ February 15, 1991,/6/ and February 13, 1992,/7/
                 respectively.
            (3)  Letter Agreement dated January 27, 1993, renewing Transfer
                 Agency Agreement./8/
            (4)  Transfer Agent Agreement dated August 3, 1993./11/

        (i) (1)  Form of Opinion and Consent of Lawrence, Kamin, Saunders &
                 Uhlenhop./1A/
            (2)  Consent and Opinion of Vedder, Price, Kaufman & Kammholz./12/
            (3)  Consent and Opinion of Vedder, Price, Kaufman & Kammholz./13/
           *(4)  Consent and Opinion of Vedder, Price, Kaufman & Kammholz.
            (5)  Form of Opinion of Ropes & Gray./1A/
            (6)  Opinion and Consent of Ropes & Gray./12/
            (7)  Opinion and Consent of Ropes & Gray./13/

       *(j) (1)  Consent of Ernst & Young LLP.
            (2)  Consent of Checkers, Simon & Rosner LLP./13/

        (k) Not applicable.

        (l) (1)  Form of Contribution Agreement with Initial Shareholders./1/
            (2)  Contribution Agreement dated December 8, 1986, from James D.
                 Oberweis with respect to the purchase of an aggregate of 5,500
                 shares as custodian for two minor children for $10.00 each (a
                 total of $55,000)./2/

                                      C-2
<PAGE>

            (3)  Contribution Agreement dated December 8, 1986, from Lora J.
                 Oberweis with respect to the purchase of 2,000 shares for
                 $10.00 each (a total of $20,000)./2/
            (4)  Contribution Agreement dated December 8, 1986, from Helen Cisek
                 with respect to the purchase of 1,500 shares for $10.00 each (a
                 total of $15,000)./2/
            (5)  Contribution Agreement dated December 8, 1986, from Tedd
                 Determan with respect to the purchase of an aggregate of 1,000
                 shares for $10.00 each (a total of $10,000)./2/

         (m)(1)  Plan of Distribution pursuant to Rule 12b-1./4/
            (2)  Distribution and Shareholder Service Agreement./5/
            (3)  Amendment to Plan of Distribution pursuant to Rule 12b-1 and
                 Distribution and Shareholder Service Agreement./8/
            (4)  Plan of Distribution pursuant to Rule 12b-1 as amended October
                 1, 1994./11/
            (5)  Form of Plan of Distribution pursuant to Rule 12b-1 as amended
                 January 1, 1996./11/
            (6)  Distribution Agreement dated October 1, 1994./11/
            (7)  Form of Distribution and Shareholder Service Agreement dated
                 January 1, 1996./11/
            (8)  Distribution and Shareholder Service Agreement dated January 2,
                 1997./14/
            (9)  Shareholder Service Agreement dated October 1, 1994./11/

         (n)     Not applicable.
        *(o)     Codes of Ethics.
________________

/*/  Filed herewith.
/1/  Previously filed with the Registration Statement and incorporated herein by
     reference.
/1A/ Previously filed with the Registration Statement.
/2/  Previously filed with Pre-Effective Amendment No. 2 (Amendment No. 2) dated
     January 14, 1987 and incorporated herein by reference.
/2A/ Previously filed with Pre-Effective Amendment No. 2.
/3/  Previously filed with Post-Effective Amendment No. 2 (Amendment No. 4)
     dated February 28, 1988.
/4/  Previously filed with Post-Effective Amendment No. 3 (Amendment No. 5)
     dated March 2, 1989 and incorporated herein by reference.
/5/  Previously filed with Post-Effective Amendment No. 4 (Amendment No. 6)
     dated February 28, 1990 and incorporated herein by reference.
/6/  Previously filed with Post-Effective Amendment No. 5 (Amendment No. 7)
     dated March 1, 1991 and incorporated herein by reference.
/7/  Previously filed with Post-Effective Amendment No. 6 (Amendment No. 8)
     dated March 2, 1992 and incorporated herein by reference.

                                      C-3
<PAGE>

/8/  Previously filed with Post-Effective Amendment No. 7 (Amendment No. 9)
     dated March 1, 1993 and incorporated herein by reference.
/9/  Previously filed with Post-Effective Amendment No. 8 (Amendment No. 10)
     dated April 29, 1994 and incorporated herein by reference.
/10/ Previously filed with Post-Effective Amendment No. 9 (Amendment No. 11)
     dated February 28, 1995 and incorporated herein by reference.
/11/ Previously filed via EDGAR with Post-Effective Amendment No. 10 (Amendment
     No. 12) dated October 18, 1995 and incorporated herein by reference.
/12/ Previously filed with Post-Effective Amendment No. 11 (Amendment No. 13)
     dated December 21, 1995 and incorporated herein by reference.
/13/ Previously filed with Post-Effective Amendment No. 14 (Amendment No. 16)
     dated September 12, 1996 and incorporated herein by reference.
/14/ Previously filed with Post-Effective No. 15 (Amendment No. 17) dated
     February 28, 1997 and incorporated herein by reference.

ITEM 24. PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT.

Inapplicable.

ITEM 25. INDEMNIFICATION

A response has been previously filed with Pre-Effective Amendment No. 2
(Amendment No. 2) dated January 14, 1987 and is incorporated herein by
reference.  The Fund has also purchased a liability policy which indemnifies the
Fund's officers and trustees against loss arising from claims by reason of their
legal liability for acts as officers and trustees, subject to limitations and
conditions as set forth in such policy.

Insofar as indemnification for liabilities arising under the Securities Act of
1933 (the "Act") may be permitted to trustees, officers and controlling persons
of the Registrant pursuant to the foregoing provisions, or otherwise, the
Registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Registrant of expenses
incurred or paid by a trustee, officer or controlling person of the Registrant
in the successful defense of any action, suit or proceeding) is asserted by such
trustee, officer or controlling person in connection with the securities being
registered, and the Commission remains of the same opinion, the Registrant will,
unless in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question of whether
such indemnification by it is against public policy as expressed in the Act and
will be governed by the final adjudication of such issue.

ITEM 26. BUSINESS AND OTHER CONNECTION OF INVESTMENT ADVISER.

(a)  Oberweis Asset Management, Inc.

                                      C-4
<PAGE>

     Oberweis Asset Management, Inc. ("OAM") was organized in 1989. Its
activities are limited to acting as an investment adviser.

(b)  Set forth below are the names of the directors and officers of OAM (other
than those officers who are also officers of the Registrant) and any other
business, profession, vocation or employment of a substantial nature in which
such directors and officers have been involved an any time during the past two
fiscal years.

<TABLE>
<CAPTION>

NAME AND
POSITIONS WITH OAM     NAME OF COMPANY                   POSITION
- -------------------    ---------------                   --------
<S>                    <C>                               <C>
Elaine M. Oberweis     Oberweis Dairy, Inc.              Chief Executive Officer
Director               951 Ice Cream Drive
                       North Aurora, Illinois  60542
</TABLE>

ITEM 27. PRINCIPAL UNDERWRITERS

(a)  None.

(b)  Set forth below are the names of the directors and officers of
     Oberweis.net, Inc.:

<TABLE>

<S>                     <C>
James W. Oberweis       Director and President

Patrick B. Joyce        Director, Executive Vice President, Treasurer, Secretary
                        and Chief Financial Officer

Martin L. Yokosawa      Senior Vice President
</TABLE>

The principal business address of all such persons is 951 Ice Cream Drive, Suite
200, North Aurora, Illinois 60542.

(c)  None.

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS

The accounts, books and other documents required to be maintained by Registrant
pursuant to Section 31(a) of the Investment Company Act of 1940 and rules
promulgated thereunder are in the possession of Oberweis Asset Management, Inc.
at its offices at 951 Ice Cream Drive, Suite 200, North Aurora, Illinois 60542,
except those books, records and other documents maintained by the custodian,
State Street Bank and Trust Company 801 Pennsylvania Kansas City, Missouri
64105, and the transfer agent and registrar, Investors Fiduciary Trust Company,
which are located at its offices at 330 West 9th St. Kansas City, Missouri
64105.

ITEM 29. MANAGEMENT SERVICES

Not applicable.

                                      C-5
<PAGE>

ITEM 30. UNDERTAKINGS

(a)  Not applicable.

(b)  Not applicable.

(c) The Registrant hereby undertakes to furnish each person to whom a Prospectus
is delivered with a copy of the Registrant's latest Annual Report to
Shareholders upon request and without charge.

                                      C-6
<PAGE>

                                  SIGNATURES

Pursuant to the requirements of the Securities Act and the Investment Company
Act, the Fund certifies that it meets all of the requirements for effectiveness
of this registration statement under Rule 485(b) under the Securities Act and
has duly caused this registration statement to be signed on its behalf by the
undersigned, duly authorized, in the City of North Aurora, and State of
Illinois, on the 25th day of April, 2000.

                                      THE OBERWEIS FUNDS


                                      By:  /s/ James D. Oberweis
                                           ------------------------------------
                                               James D. Oberweis, President


Pursuant to the requirements of the Securities Act of 1933, this registration
statement has been signed below by the following persons in the capacities and
on the dates indicated.


<TABLE>
<CAPTION>

Name                           Title
<S>                            <C>                             <C>
/s/ James D. Oberweis
- -------------------------    President (Principal Executive    April 25, 2000
    James D. Oberweis        Officer) and Trustee

/s/ Thomas J. Burke
- -------------------------    Trustee                           April 25, 2000
    Thomas J. Burke

/s/ Douglas P. Hoffmeyer     Trustee                           April 25, 2000
- -------------------------
    Douglas P. Hoffmeyer

/s/ Edward F. Streit
- -------------------------    Trustee                           April 25, 2000
    Edward F. Streit

/s/ Patrick B. Joyce
- -------------------------    Executive Vice President and      April 25, 2000
    Patrick B. Joyce         Treasurer (Principal Financial
                             and Accounting Officer)
</TABLE>

                                      C-7

<PAGE>

                                                                Exhibit 23(i)(4)

                                       April 24, 2000

The Oberweis Funds
951 Ice Cream Drive, Suite 200
North Aurora, Illinois 60542

Gentlemen:

     Reference is made to Post-Effective Amendment No. 18 to the Registration
Statement on Form N-1A under the Securities Act of 1933 being filed by The
Oberweis Funds (the "Fund") in connection with the public offering from time to
time of units of beneficial interest, no par value ("Shares"), in three
authorized series (the "Portfolios").

     We are counsel to the Fund and have counseled the Fund regarding various
legal matters. We have examined such Fund records and other documents and
certificates as we have considered necessary or appropriate for the purposes of
this opinion.  In our examination of such materials, we have assumed the
genuineness of all signatures and the conformity to original documents of all
copies submitted to us.

     Based upon the foregoing and assuming that the Fund's Agreement and
Declaration of Trust dated July 7, 1986, the Written Instrument Establishing and
Designating the Oberweis Micro-Cap Portfolio dated November 21, 1995, the
Written Instrument Establishing and Designating the Oberweis Mid-Cap Portfolio
dated August 22, 1996, and the By-Laws of the Fund adopted September 18, 1986,
are presently in full force and effect and have not been amended in any respect
and that the resolutions adopted by the Board of Trustees of the Fund on July 7,
1986, September 18, 1986, November 21, 1995 and August 20, 1996, relating to
organizational matters, securities matters and the issuance of shares are
presently in full force and effect and have not been amended in any respect, we
advise you and opine that (a) the Fund is a validly existing voluntary
association with transferrable shares under the laws of the Commonwealth of
Massachusetts and is authorized to issue an unlimited number of Shares in the
Portfolios; and (b) presently and upon such further issuance of the Shares in
accordance with the Fund's Agreement and Declaration of Trust and the receipt by
the Fund of a purchase price not less than the net asset value per Share and
when the pertinent provisions of the Securities Act of 1933 and such "blue-sky"
and securities laws as may be applicable have been complied with, and assuming
that the Fund continues to validly exist as provided in (a) above, the Shares
are and will be legally issued and outstanding, fully paid and nonassessable.
<PAGE>

The Oberweis Funds
April 24, 2000
Page 2


     The Fund is an entity of the type commonly known as a "Massachusetts
business trust." Under Massachusetts law, shareholders could, under certain
circumstances, be held personally liable for the obligations of the Fund or the
Portfolios.  However, the Agreement and Declaration of Trust provides for
indemnification out of the property of the Portfolios for all loss and expense
of any shareholder of the Portfolios held personally liable for the obligations
of such Portfolio.  Thus, the risk of liability is limited to circumstances in
which the Portfolios would be unable to meet their obligations.

     This opinion is solely for the benefit of the Fund, the Fund's Board of
Trustees and the Fund's officers and may not be relied upon by any other person
without our prior written consent. We hereby consent to the use of this opinion
in connection with said Post-Effective Amendment.

                                 Very truly yours,

                                 /s/ Vedder, Price, Kaufman & Kammholz

                                 VEDDER, PRICE, KAUFMAN & KAMMHOLZ

JAA/COK/sfs

<PAGE>

                                                                EXHIBIT 23(j)(1)

                        CONSENT OF INDEPENDENT AUDITORS

We consent to the reference to our firm under the captions "Financial
Highlights" and "Independent Auditors" and to the use of our report dated
January 28, 2000 in the Registration Statement (Form N-1A) and related
Prospectus of The Oberweis Funds, filed with the Securities and Exchange
Commission in this Post-Effective Amendment No. 18 to the Registration Statement
under Securities Act of 1933 (Registration No. 33-9093) and in this Amendment
No. 20 to the Registration Statement under the Investment Company Act of 1940
(Registration No. 811-4854).

                                                      /s/ ERNST & YOUNG LLP

Chicago, Illinois
April 24, 2000                                          ERNST & YOUNG LLP

<PAGE>

                                                                   Exhibit 23(o)

                                 CODE OF ETHICS

                               THE OBERWEIS FUNDS
                        OBERWEIS ASSET MANAGEMENT, INC.
                               OBERWEIS.NET, INC


     This Code of Ethics (the "Code") has been adopted by the respective Boards
of Trustees or Directors of The Oberweis Funds (the "Fund"), Oberweis Asset
Management, Inc. (the "Adviser") and Oberweis.net, Inc. (the "Distributor").
The standards set forth in the Code are to be viewed as mandatory rather than as
permissive.  In addition, the Code is adopted to serve as the minimum standard
of conduct for persons having access to information regarding the purchase and
sale of portfolio securities by the Fund or other non-investment company clients
("Advisory Clients"). Persons subject to the Code must be mindful of the
fiduciary duty which they owe to the Fund's shareholders and Advisory Clients
to act, at all times, in the shareholders' and Advisory Clients' best interest
and to, among other things, refrain from engaging in personal securities
transactions which take unfair advantage of their relationship to the Fund and
Advisory Clients.  Persons subject to the Code are also subject to the fiduciary
duties set by Section 36(b) of the Investment Company Act of 1940 (the "1940
Act").

1.   Definitions. As used herein, the following terms have the indicated
meanings:

     a.   An "Access Person" is:

          i.   any trustee, director, officer or Advisory Person of the Fund or
               the Adviser; and

          ii.  any officer, employee or agent of the Distributor who in the
               ordinary course of his/her business makes, participates in or
               obtains information regarding the purchase or sale of a security
               by the Fund or for the account of an Advisory Client, or whose
               functions or duties as part of the ordinary course of his
               business relate to the making of any recommendations with respect
               to such purchases or sales of securities.


     b.   "Adviser" shall mean Oberweis Asset Management, Inc., an Illinois
          corporation that acts as the investment adviser and manager for the
          Fund and Advisory Clients.

     c.   An "Advisory Person" is:

          i.   Any employee of the Fund or the Adviser (or of any company in a
               control relationship to the Fund or Adviser) who in connection
               with his/her regular functions or duties, makes, participates in,
               or obtains information regarding the purchase or sale of a
               Security by the Fund or to or for the account of an

<PAGE>

               Advisory Client, or whose functions relate to the making of
               any recommendations with respect to such purchases and sales; and

          ii.  Any natural person in a control relationship to the Fund or the
               Adviser who obtains information concerning recommendations made
               to the Fund or to or for the account of an Advisory Client with
               regard to the purchase or sale of a Security.

     d.   A Security is "being purchased or sold" by the Fund or Advisory Client
          from (i) the time when the person or persons having the authority to
          make investment decisions for the Fund decide(s) to purchase or sell a
          specified amount of the Security within a specified price range until
          (ii) the earlier of the time when the sale or purchase has been
          completed or the time when the price range is first exceeded.

     e.   A Security is "being considered for purchase or sale" when a
          recommendation to purchase or sell a Security has been made and
          communicated and, with respect to the person making the
          recommendation, when such person seriously considers making such a
          recommendation.

     f.   The "beneficial ownership" of a Security shall be determined hereunder
          in the same manner as under Section 16 of the Securities Exchange Act
          of 1934 and the rules and regulations thereunder, except that the
          determination of direct or indirect beneficial ownership shall apply
          to all securities which the person has or acquires. Specifically, a
          direct or indirect opportunity to profit or share in any profit
          derived from a transaction in any class of security coupled with
          either the power to vote conferred by such security or the power to
          dispose of (or direct the disposition of) such security, will confer
          beneficial ownership. Such an opportunity may come about through any
          contract, arrangement, understanding, relationship or otherwise. Thus,
          a person is regarded as the beneficial owner of securities held by
          members of his immediate family sharing the same household (immediate
          family members include any child, grandchild, stepchild, spouse,
          sibling, parent, stepparent, grandparent, and adoptive and certain in-
          law relationships). Similarly, a general partner's proportionate
          interest in the portfolio securities held by a general or limited
          partnership, a person's right to dividends that is separate or
          separable from the underlying securities, and a person's right to
          acquire or dispose of securities through the exercise or conversion of
          any derivative security (such as an option or a warrant), whether or
          not presently exercisable, will confer beneficial ownership, and
          transactions involving them should be reported. Any other indirect
          interest in securities including performance-related fees received for
          services rendered with regard to securities as well as a person's
          interest in securities held by a trust may confer beneficial ownership
          and thus require the reporting of any transactions involving them.

                                       2
<PAGE>

     g.   "Companies" shall mean collectively the Fund, the Adviser, and the
          Distributor.

     h.   "Control" shall have the same meaning as that set forth in Section
          2(a)(9) of the 1940 Act.

     i.   An "Independent Trustee" is any trustee of the Fund who is not an
          "interested person" of the Fund within the meaning of Section 2(a)(19)
          of the 1940 Act.

     j.   "Initial Public Offering" means an offering of securities registered
          under the Securities Act of 1933, the issuer of which, immediately
          before the registration, was not subject to the reporting requirements
          of sections 13 or 15(d) of the Securities Exchange Act of 1934.

     k.   "Investment Personnel" shall mean (i) a person who makes decisions
          regarding the purchase or sale of securities by or on behalf of the
          Fund or an Advisory Client and any person such as an analyst or trader
          who directly assists in the process and (ii) any natural person who
          controls the Fund or Adviser and who obtains information concerning
          recommendations made to the Fund regarding the purchase or sale of
          securities by the Fund.

     l.   "Limited Offering" means an offering that is exempt from registration
          under the Securities Act of 1933 pursuant to section 4(2) or section
          4(6) or pursuant to rule 504, rule 505 or rule 506 thereunder.

     m.   "Person" means any trustee, director, shareholder, officer or employee
          of any of the Companies.

     n.   The term "purchase or sale of a Security" includes, inter alia, the
          writing of an option to purchase or sell a Security.

     o.   The term "Security" has the meaning set forth in Section 2(a)(36) of
          the 1940 Act, except that it does not include securities issued by the
          Government of the United States, short term debt securities which are
          "government securities" within the meaning of Section 2(a)(16) of the
          1940 Act, bankers' acceptances, bank and savings and loan association
          accounts, repurchase agreements and certificates of deposit,
          commercial paper, or shares of registered open-end investment
          companies.

     p.   A person will "indirectly" effect a transaction if, but only if, the
          person knowingly causes or influences another person to effect the
          transaction.

     q.   The "Supervisory Committee" shall consist of the person or persons so
          designated by the Board of Directors of the Adviser.

                                       3

<PAGE>

2.   Statement of General Fiduciary Principles: While the Adviser and the
Distributor each believe that individual investment activities should be
encouraged, their philosophy has always been to avoid conflicts of interest (or
even the appearance of conflict) between client services, investment adviser
transactions, and personal investments.  This inevitably places some
restrictions on the freedom in investment activities of persons associated with
the Adviser or the Distributor.  This Code of Ethics has been adopted to meet
these concerns.

     The general fiduciary principles governing this Code shall be that, (a) in
any situation where the potential for conflict exists, transactions for clients
must take precedence over personal transactions, (b) all personal securities
transactions must be conducted consistent with this Code and in such a manner as
to avoid any actual or potential conflict of interest or any abuse of an
individual's position of trust and responsibility, and (c) no person associated
with the Adviser or Distributor shall take inappropriate advantage of his or her
position.  Should any situation arise not specifically governed by this Code,
these general fiduciary principles shall govern the resolution of the matter.
Accordingly, this Code shall be interpreted in furtherance of such general
fiduciary principles and the general policies of Section 17j of the 1940 Act and
Rule 17j-1 thereunder.

     Compliance with the Code of Ethics is a condition of employment with the
Adviser or Distributor and wilful violation of its provisions may be cause for
termination of employment. Taking into consideration all relevant circumstances,
management of the entity employing the individual in question will determine
what action is appropriate for any breach of its provisions, subject to the
recommendation of the Supervisory Committee as described below.  The decision of
management will also govern questions of interpretation arising under this Code.

3.   Exempted Transactions. The prohibitions and reporting requirements of
Sections 4 and 5 of this Code do not apply to the following:

     a.   Purchases or sales effected in any account over which the Access
          Person has no direct or indirect influence or control.

     b.   Purchases or sales of Securities that are not eligible for purchase or
          sale by the Fund or to or for the account of an Advisory Client, other
          than securities purchased or sold in Initial Public Offerings and
          Limited Offerings.

     c.   Purchases or sales that are non-volitional on the part of the Access
          Person.

     d.   Purchases that are part of an automatic dividend reinvestment plan.

     e.   Purchases effected on the exercise of rights issued by an issuer pro
          rata to all holders of a class of its securities, to the extent such
          rights were acquired from such issuer, and sales of such rights so
          acquired.

                                       4
<PAGE>

4.   Prohibitions.

     a.   Except as provided in Section 3 of this Code, no Access Person may
          purchase or sell, directly or indirectly, a Security in which such
          Access Person has, or by reason of such transaction acquires, any
          direct or beneficial ownership, if the Access Person knew or
          reasonably should have known at the time of such purchase or sale that
          the Security was being purchased or sold by the Fund or an Advisory
          Client, or was being considered for such purchase or sale.

     b.   No Access Person may disclose to any person any non-public information
          regarding any Security being purchased or sold by the Fund or an
          Advisory Client, or being considered for such purchase or sale, but
          this prohibition will lapse when such purchase or sale has been
          completed. This prohibition does not apply to disclosures among Access
          Persons in connection with their performance of duties for the Fund or
          Advisory Client.

     c.   Any Access Person who specifically recommends to a Fund or Advisory
          Client the purchase or sale of a Security must disclose any beneficial
          interest in the Security that is known to the Access Person and that
          the Access Person has or expects to acquire within a reasonable period
          of time. This requirement does not apply to delivery to the Fund of
          recommendations (such as brokers' reports and investment letters) that
          are addressed or available to parties other than the Fund or Advisory
          Clients.

     d.   No person covered by this Code of Ethics shall engage in any activity
          that involves inside information in violation of the Insider Trading
          and Securities Fraud Enforcement Act of 1988.

     e.   No Access Person, other than an Independent Trustee, may seek or
          accept gifts, favors, preferential treatment or valuable consideration
          of more than a de minimus nature from a broker-dealer or other
          companies or persons that do business with or have proposed doing
          business with the Fund or any company in a control relationship with
          the Fund. For purposes of this subsection a de minimus gift shall
          include an occasional meal, a ticket to a sporting event or the
          theater, or comparable entertainment, or an unconditional gift of a
          typical item of reminder or other gifts amounting in value to not more
          than $100 per person per year.

     f.   No Access Person, other than an Independent Trustee, may purchase,
          directly or indirectly, any Security in an Initial Public Offering of
          that Security.

     g.   No Access Person, other than an Independent Trustee, may purchase,
          directly or indirectly, any Security in a Limited Offering of that
          Security without the express prior approval of the Supervisory
          Committee. Any Access Person who has been authorized to acquire a
          Security in a private placement pursuant to this subsection must
          disclose that investment if the Access Person participates in any
          subsequent

                                       5
<PAGE>

          consideration by the Fund of an investment in the issuer of that
          Security. The Fund's investment decision with respect to such a
          Security must be independently reviewed by Investment Personnel with
          no personal interest in the issuer of the Security.

     h.   Except as provided in Section 3 of this Code, no Access Person, other
          than an Independent Trustee, may execute a Securities transaction on a
          day during which the Fund or Advisory Client has a pending "buy" or
          "sell" order in that same Security until that order is executed or
          withdrawn. In addition, Investment Personnel may not buy or sell a
          Security within seven calendar days prior to, or within seven calendar
          days after, the Fund or Advisory Client trades in that Security;
          provided however, the Investment Personnel may sell a Security within
          seven calendar days after the Fund or Advisory Client executed a sales
          transaction in that same Security if the Fund and Advisory Client no
          longer have a position in that Security. Any profits realized by an
          Access Person or Investment Personnel in contravention of this
          subsection must be disgorged.

     i.   No Access Person, other than an Independent Trustee, may serve on the
          board of directors of any publicly traded company without the prior
          approval of the Supervisory Committee.

     j.   No Access Person, other than an Independent Trustee, may acquire a
          Security without first obtaining "preclearance" from the Supervisory
          Committee. The Supervisory Committee will grant "preclearance" if it
          appears to the Committee that the investment would not violate any
          provision of this Code and would not create any unacceptable
          conflicts. Such "preclearance" shall be valid for 2 calendar days from
          the date that it is granted.

5.   Reporting.

     a.   Except as provided in Section 3 of this Code, each Access Person other
          than an Independent Trustee must report to the entity of which he or
          she is an Access Person the information described in Section 5(c) of
          this Code with respect to any transaction of which the Person is aware
          in any Security in which the Access Person has, or by reason of such
          transaction acquires, any beneficial ownership.

     b.   Except as provided in Section 3 of this Code, each Independent Trustee
          must report to the Supervisory Committee the information described in
          Section 5(c) of this Code with respect to any transaction of which the
          Independent Trustee is aware in a Security in which the Independent
          Trustee has, or by reason of such transaction acquires, any beneficial
          ownership if such Independent Trustee at the time of the transaction
          knew, or in the ordinary course of fulfilling the Independent
          Trustee's official duties as a trustee of a Fund should have known,
          that, during the 15-day period immediately preceding or after the date
          of the transaction, the Security was purchased or sold by the Fund, or
          was being considered for such purchase or sale.


                                       6
<PAGE>

     c.   Every transaction report required under Section 5(a) must be made no
          later than 10 days after the end of the calendar quarter in which the
          transaction with respect to which the report relates is effected or
          becomes known to the reporting Access Person, and must contain the
          following information:

          i.   The date of the transaction, the title and number of shares, and
               the principal amount of each Security involved;

          ii.  The nature of the transaction (i.e., purchase, sale or any other
               type of acquisition or disposition);

          iii. The price at which the transaction was effected; and

          iv.  The name of the broker, dealer, bank or other party with or
               through whom the transaction was effected.

     d.   In the event that no transactions were effected by an Access Person in
          a calendar quarter, the Access Person, other than an Independent
          Trustee, must file a report, no later than 10 days after the end of
          such calendar quarter, stating that no transactions subject to the
          reporting requirements were effected during the calendar quarter.

     e.   An Access Person or Independent Trustee who would be required to file
          a report under Section 5(a) or (b), respectively, but for the fact
          that the transaction was effected for an account over which the person
          has no "direct or indirect influence", must certify in writing that he
          or she does not have "any direct or indirect influence or control"
          over the account in question. Such written certification must be given
          to the Supervisory Committee no later than 10 days after the end of
          the calendar quarter in which the transaction with respect to which
          the certification relates is effected or becomes known to the
          certifying Access Person or Independent Trustee.

     f.   If a monthly brokerage statement or a confirmation for the reporting
          Access Person's transaction includes the required information and is
          received within the required time period, the form of report required
          in Sections 5(a) and 5(d) may be a copy of the brokerage statement or
          confirmation involved.

     g.   No such report will be construed as an admission by the Access Person
          making the report that the Access Person has any direct or indirect
          beneficial ownership interest in the Security to which the report
          relates.

     h.   Each Access Person, other than an Independent Trustee, will at the
          time of his/her employment (or upon becoming an Access Person) and at
          least annually provide in writing to the Supervisory Committee, or to
          such other person or persons as the Committee may designate, his
          personal securities holdings and a report with respect to accounts
          that the Access Person (and the Access Person's spouse) may maintain
          with any broker, the name in which the account is maintained, and the
          number of the

                                       7
<PAGE>

          account. Each such holdings report shall be made within 10 days after
          the commencement of employment (or becoming an Access Person). Annual
          Reports shall be made within 30 days after the end of the calendar
          year. The information contained in the report must be current as of a
          date within 30 days of the date of submission.

     i.   The Companies shall identify all Access Persons who are under a duty
          to make reports to such entities pursuant to this Section 5 and shall
          inform such persons of such duty.

     j.   If no such account is maintained by an Access Person or the Access
          Person's spouse, the Access Person will so advise the appropriate
          person in writing. The existence of any such account will not raise a
          presumption that the Access Person is acting in a manner detrimental
          to a Fund.

     k.   The Supervisory Committee or its designee shall be responsible for
          implementing compliance procedures to review reports made pursuant to
          this Section.

     l.   All Access Persons, other than an Independent Trustee, shall place
          through Oberweis.net, Inc., as broker-dealer affiliated with the Fund,
          every Securities transaction in which they, their families (including
          spouses, minor children and adults living in the same household), and
          trusts of which they are trustees or in which they have a beneficial
          interest have participated except that each Access Person that is an
          employee of Oberweis.net, Inc. may maintain a SIMPLE IRA brokerage
          account with Fidelity Brokerage Services and effect securities
          transactions through such account.

     m.   All Access Persons, other than an Independent Trustee, must direct
          Oberweis.net, Inc. and Fidelity Brokerage Services, to supply to the
          Supervisory Committee duplicate copies of monthly brokerage
          statements.

6.   Trustee Approval and Reports:

     a.   The Companies will prepare an annual report to the Board of Trustees
          of the Fund that summarizes existing procedures concerning personal
          investing and any additional procedures adopted during the year;
          describes any material issues arising under the Code or such
          procedures since the last report, including but not limited to any
          material violations of the Code or such procedures and any sanctions
          imposed in response thereto; identifies material conflicts that arose
          during the year; and identifies any recommended changes in existing
          restrictions or procedures based upon the Companies' experience under
          the Code of Ethics, evolving industry practices, or developments in
          applicable laws or regulations. Such report shall include any
          certifications required by Rule 17j-1.


                                       8
<PAGE>

     b.   The Companies shall submit this Code to the Board of Trustees of the
          Fund for approval within the time frames required by Rule 17j-1. Any
          material changes to this Code shall be submitted to such board within
          six months of such change.

     c.   All reports required to be made hereunder shall be delivered to and
          preserved by the Companies in accordance with this Code and applicable
          regulations for the benefit of the entity for which such report is
          made.

     d.   All information contained in the reports filed pursuant to this Code
          shall be deemed confidential and shall not be disclosed to any person
          except (i) the reporting person, (ii) the Securities and Exchange
          Commission or any representative thereof, (iii) as required by law or
          legal process, or (iv) except as may be required by this Code or as
          may be necessary or advisable to administer and enforce the provisions
          of this Code.

7.   Recordkeeping:  The Companies shall maintain the following records in the
manner specified:

     a.   A copy of this Code and any amendment thereof which is or at any time
          within the past five years has been in effect shall be preserved in an
          easily accessible place;

     b.   A record of any violation of this Code, or any amendment thereof, and
          of any action taken as a result of such violation, shall be preserved
          in an easily accessible place for a period of not less than five years
          following the end of the fiscal year in which the violation occurs;

     c.   A copy of each report made by an Access Person pursuant to this Code
          shall be preserved by the entity receiving the report for a period of
          not less than five years from the end of the fiscal year in which it
          is made, the first two years in an easily accessible place;

     d.   A list of all persons who are, or within the past five years have
          been, required to make reports pursuant to this Code shall be
          maintained in an easily accessible place;

     e.   A list of the names of all persons who are, or within the past five
          years, have been, responsible for reviewing the reports filed pursuant
          to Section 5 of this Code shall be maintained in an easily accessible
          place;

     f.   A record of any approvals granted pursuant to Section 4(q) or Section
          9(c) shall be preserved for a period of five years from the end of the
          fiscal year in which such approval is given; and


                                       9
<PAGE>

     g.   A copy of each report made pursuant to Section 6 of this Code must be
          maintained for at least five years after the end of the fiscal year in
          which it was made, the first two years in an easily accessible place.

The Adviser shall maintain and preserve the aforementioned records in a central
location for the benefit of all Companies.

8.   Sanctions:  Upon discovery of a violation of this Code, the Companies may
impose such sanctions as they deem appropriate including, without limitation, a
letter of censure, suspension or termination of employment.  Additionally, all
violations of this Code which involve the portfolio securities of the Fund or
material violations of this Code which involve an officer of the Fund and the
sanctions imposed by the Adviser or by the Distributor, if any, shall be
reported to the Board of Trustees of the Fund.

The Board of Trustees of the Fund or the Board of Directors of the Adviser or
the Board of Directors of the Distributor, as the case may be, may in its or
their discretion delegate to the Supervisory Committee some or all of the
responsibility for investigating and reviewing possible violations of this Code
and determining appropriate sanctions therefor.

9.   Miscellaneous.

     a.   No knowledge or information regarding a Fund's portfolio transactions
          will be imputed to a trustee by reason of a meeting of the board of
          trustees if the trustee did not attend the portion of the meeting at
          which the information was discussed.

     b.   No report is required under Section 5 of this Code if the information
          therein would duplicate information recorded under subsections 12 or
          13 of Rule 204-2(a) under the Investment Advisers Act of 1940;
          provided that such information shall be provided to the appropriate
          Supervisory Committee.

     c.   Securities, and transactions in Securities, may be exempted
          (individually or by class) from Section 4(a) hereof upon a finding
          that the purchase or sale involved is only remotely potentially
          harmful to the Fund and Advisory Clients, e.g., because the purchase
          or sale would be very unlikely to affect a highly institutional
          market. In addition, the sale of a Security by an Access Person may be
          exempted from Section 4(a) hereof upon a finding of unusual
          circumstances, e.g., a personal financial emergency. In each case, an
          exception may be granted only if it is determined that the transaction
          would be consistent with the individual's fiduciary obligations to the
          Fund and Advisory Clients. Any application for an exemption to make
          such a transaction shall be made to the Supervisory Committee, which
          application may be approved or denied. Prior to granting approval, the
          Supervisory Committee must also obtain the concurrence of a
          disinterested member of the Board of Trustees, or if no disinterested
          Board Member is available, concurrence by counsel to the Fund. Any
          exceptions will be reported to the Board of Trustees at the meeting of
          the Board immediately following the approval of the exception.

                                      10
<PAGE>

     d.   The fact that a Security has been the subject of a formal or informal
          research report shall not, in and of itself, indicate that the
          Security is under consideration for purchase or sale. For purposes
          hereof, it shall not be considered that any Access Person knew or
          should have known, that a Security was under consideration for
          purchase or sale or that Security had been purchased or sold solely on
          the basis of receipt of a research report thereon.

     e.   No Security purchase or sale by an Access Person will prevent the
          Investment Personnel from purchasing or selling the Security for the
          Fund and Advisory Clients.

     f.   All Access Persons must certify annually that they have read and
          understand this Code and recognize that they are subject thereto. The
          certification should also state that the Access Person has complied
          with the requirements of the Code and that all reports and disclosures
          required under this Section have been made.

                                  * * * * * *

     The undersigned acknowledges receipt of a copy of the Code of Ethics and
agrees to comply therewith.



____________________________________    ______________________________________
Date                                    Signature




               Adopted by the Fund on ___________________, 2000
                   Adopted by the Adviser on April 24, 2000
                 Adopted by the Distributor on April 24, 2000

                                      11


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission