BARON ASSET FUND
485APOS, 1999-12-17
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                     UNITED STATES                   OMB APPROVAL
            SECURITIES AND EXCHANGE COMMISSION       OMB Number:   3235-0307
                 Washington, D.C. 20549              Expires:   May 31, 2000
                                                     Estimated average burden
                                                     hours per response..212.95

                       FORM  N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933                  [ ]
Pre-Effective Amendment No. ___                                          [ ]
Post-Effective Amendment No.  17                                         [X]
                             ----
                         and/or

REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940          [ ]
    Amendment No.  18                                                    [X]
                  ----
            (Check appropriate box or boxes)


                      BARON ASSET FUND
- -------------------------------------------------------------------------------
         (Exact Name of Registrant as Specified in Charter)

               767 Fifth Avenue, New York, NY                         10153
- ----------------------------------------------------------------   ------------
            (Address of Principal Executive Offices)                (Zip Code)

Registrant's Telephone Number, including Area Code         212-583-2000
                                                  -----------------------------

   Linda S. Martinson, c/o Baron Asset Fund, 767 Fifth Avenue, NY, NY 10153
- -------------------------------------------------------------------------------
             (Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering                    immediately
                                             ----------------------------------

It is proposed that this filing will become effective (check appropriate box)
  [   ]   immediately upon filing pursuant to paragraph (b)
  [   ]   on (date) pursuant to paragraph (b)
  [   ]   60 days after filing pursuant to paragraph (a)(1)
  [   ]   on (date) pursuant to paragraph (a)(1)
  [ X ]   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.

     Omit from the facing sheet  reference to the other Act if the  Registration
Statement  or  amendment  is filed  under  only  one of the  Acts.  Include  the
"Approximate  Date of Proposed Public  Offering" and "Title of Securities  Being
Registered"  only where securities are being registered under the Securities Act
of 1933.

     Form N-1A is to be used by open-end management investment companies, except
insurance  company  separate  accounts and small business  investment  companies
licensed  under the United  States Small  Business  Administration,  to register
under the  Investment  Company Act of 1940 and to offer their  shares  under the
Securities  Act of 1933.  The  Commission  has  designed  Form  N-1A to  provide
investors  with  information  that will assist  them in making a decision  about
investing in an investment company eligible to use the Form. The Commission also
may use the  information  provided  on Form N-1A in its  regulatory,  disclosure
review, inspection, and policy making roles.

     A  Registrant  is required to disclose  the  information  specified by Form
N-1A, and the Commission will make this information  public. A Registrant is not
required to respond to the  collection  of  information  contained  in Form N-1A
unless the Form  displays a  currently  valid  Office of  Management  and Budget
("OMB")  control number.  Please direct comments  concerning the accuracy of the
information  collection  burden estimate and suggestions for reducing the burden
to  Secretary,   Securities  and  Exchange  Commission,   450  5th  Street,  NW,
Washington,   D.C.  20549-  6009.  The  OMB  has  reviewed  this  collection  of
information under the clearance requirements of 44 U.S.C. Sec. 3507.

          Potential  persons who are to respond to the collection of information
          contained  in this form are not  required  to respond  unless the form
          displays a currently valid OMB control number.

SEC 2052 (5-98)
                                       I-3
<PAGE>


BARON ASSET FUND

BARON GROWTH FUND

BARON SMALL CAP FUND

BARON iOPPORTUNITY FUND



767 Fifth Avenue, New York, New York 10153 1-800-99-BARON 212-583-2100













This prospectus  contains  essential  information for anyone  investing in these
funds. Please read it carefully and keep it for reference.



As with all mutual  funds,  the fact that these shares are  registered  with the
Securities  and  Exchange  Commission  does not mean  that  the  Commission  has
approved or disapproved  them or determined  whether this prospectus is accurate
or complete. Anyone who tells you otherwise is committing a crime.




January   2000
- ------------------------------------
1    PROSPECTUS

<PAGE>


TABLE OF CONTENTS

______________________________________________________________________________

Information         Investment Goals and Strategies              x
about the
Funds               Principal Risks                              x

                    Past Performance                             x

                    Fund Expenses                                x

                    Financial Highlights                         x

                    Other Investment Strategies                  x

                    Management                                   x
______________________________________________________________________________

Information         How Your Shares are Priced                   x
about your
investment          How to Purchase Shares                       x

                    How to Redeem Shares                         x

                    Distributions and Taxes                      x

                    General Information                          x
______________________________________________________________________________

More
Information         Back Cover









<PAGE>


INFORMATION ABOUT THE FUNDS


INVESTMENT GOALS AND STRATEGIES


WHAT ARE THE INVESTMENT GOALS OF THE FUNDS?

BARON ASSET FUND         capital appreciation through investments in securities
                         of small and medium sized companies with undervalued
                         assets or favorable growth prospects

BARON GROWTH  FUND       capital appreciation

BARON SMALL CAP FUND     capital appreciation through investments primarily in
                         securities of small companies

BARON iOPPORTUNITY FUND  capital appreciation


WHAT ARE THE MAIN INVESTMENT STRATEGIES OF THE FUNDS?

In making  investment  decisions for the Funds the Adviser seeks securities that
the Adviser believes have:

1.   favorable price to value  characteristics based on the Adviser's assessment
     of their prospects for future growth and profitability.
2.    the potential to increase in value at least 50% over two subsequent years.

Investment decisions are made by the Funds' investment adviser, BAMCO, Inc. (the
"Adviser").  The  Adviser  seeks  investments  that are  supported  by long term
demographic, economic and societal "mega-trends." Among the industries that will
benefit  from  long  lasting  "mega-trends"  are  education,  due  to  increased
knowledge requirements in an information  based-economy;  healthcare, due to the
aging  of  America;   products  and  services  for  the  large  baby-boomer  and
echo-boomer (their children) segments of our population;  media and services for
the rapidly growing U.S. Hispanic population;  communication businesses,  due to
rapidly  increasing demand for bandwidth;  and businesses able to establish long
term  competitive  advantage  through  the  use of  the  Internet.  The  Adviser
thoroughly  researches  the companies in which the Funds  invest.  The Adviser's
research  process  includes  visits and  interviews  by the Adviser with company
managements and their major competitors.  The Adviser looks for the ability of a
company to grow its  business  substantially  within a four to five year period;
special business niches that create unusually favorable business  opportunities;
sustainable  barriers to competition;  and strong management  capabilities.  The
Adviser seeks to purchase  these  companies at what it perceives are  attractive
prices  relative to  projected  future cash flows and asset  values,  before the

<PAGE>
companies'  long-term  business  prospects are  appreciated by other  investors.
There is no assurance that the Funds will meet their investment goals. The Funds
may take large  positions in the companies in which the Adviser has the greatest
conviction.  The Funds  have a long term  outlook.  The Funds are  designed  for
long-term  investors,  not for investors who intend to sell after a short period
of time.

BARON ASSET FUND invests  primarily  in common  stocks of small and medium sized
companies selected for their capital appreciation potential.

BARON  GROWTH  FUND  invests  primarily  in common  stocks of smaller  companies
selected for their capital appreciation potential.

BARON SMALL CAP FUND  invests  primarily  in common  stocks  selected  for their
capital  appreciation  potential.  At least 65% of the Fund's  total  assets are
invested in the securities of smaller  companies based on the market size of the
investment at the time of purchase.

BARON  iOPPORTUNITY  FUND invests  primarily in common stocks selected for their
capital appreciation potential. The Fund seeks investments in companies that the
Adviser believes have Internet-related growth opportunities.  "Internet-related"
will include opportunities  directly related to the web as well as opportunities
that result from the rapidly changing information  technology  environment.  The
Fund will  focus on new media,  interactive  communication,  electronic  content
delivery,  networking  and  e-commerce.  Investments  will also include  access,
infrastructure, products and services for all of the above. The Adviser seeks to
invest in both new  emerging  companies  and more  mature  "bricks  and  mortar"
businesses   which  the  Adviser   believes   have   significant,   sustainable,
Internet-related  growth opportunities.  Internet-related  investments,  as with
investments  for the other Baron Funds,  will be purchased at prices the Adviser
deems attractive based on the Adviser's projected cash flows and/or customer and
asset  valuations  within a reasonable  time period.  At least 65% of the Fund's
total assets are invested in securities of companies that are Internet-related.


WHAT KINDS OF SECURITIES DO THE FUNDS BUY?

The  Funds  invest  primarily  in  common  stocks  but may also  invest in other
equity-type  securities  such as  convertible  bonds and  debentures,  preferred
stocks,  warrants and convertible preferred stocks.  Securities are selected for
their  capital   appreciation   potential,   and  investment  income  is  not  a
consideration.

BARON ASSET FUND  invests  primarily in small and medium  sized  companies  with
market capitalizations of approximately $500 million to $5 billion. BARON GROWTH
FUND and BARON SMALL CAP FUND invest  primarily  in small sized  companies  with
market  values  under $1.5  billion.  These Funds will not sell  positions  just
because their market values have increased. The Funds will add to positions in a
company even though its market capitalization has increased through appreciation
beyond the limits stated, if, in the Adviser's judgment, the company is still an
attractive  investment.  BARON  iOPPORTUNITY  FUND  invests in  companies of all
sizes.

<PAGE>
WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUNDS?

GENERAL STOCK MARKET RISK   The Funds' principal risks are those of investing in
the stock  market.  The value of your  investment in a Fund will increase as the
stock  market  prices  of the  securities  owned by the Fund  increase  and will
decrease as the Fund's investments  decrease in market value.  Equity securities
fluctuate in value, often based on factors unrelated to the value of the issuer,
such as  political,  economic or general  market  conditions.  Because the stock
values  fluctuate,  when you sell your  investment  you may receive more or less
money than you originally invested.

SMALL AND MEDIUM SIZED COMPANIES    The Adviser believes there is more potential
for capital  appreciation in smaller  companies but there also may be more risk.
Securities of smaller  companies may not be well known to most investors and the
securities may be thinly  traded.  Smaller  company  securities may fluctuate in
price more widely than the stock market generally and they may be more difficult
to sell  during  market  downturns.  There is more  reliance  on the skills of a
company's  management and on their continued  tenure.  This investment  approach
requires a long-term  outlook and may require  shareholders  to assume more risk
and to have more  patience  than  investing in the  securities  of larger,  more
established companies.

LARGE POSITIONS   Even though the Funds are diversified, the Funds may establish
significant  positions  in  companies  in which  the  Adviser  has the  greatest
conviction.  If the  stock  price  of one or  more  of  those  companies  should
decrease,  it would have a big impact on the Fund's net asset value.  The Fund's
returns may be more volatile than those of a less concentrated portfolio.

LONG TERM OUTLOOK AND PROJECTIONS The Funds are designed for long-term investors
who are willing to hold  investments for a substantial  period of time. The cash
flows  and  valuations  that  the  Adviser  projects  for a  company  may not be
achieved, which would negatively impact the stock market price of that company.

INTERNET  Internet-related companies and companies propelled by new technologies
may  present  the  risk of rapid  change  and  product  obsolescence  and  their
successes may be difficult to predict for the long term.  Some  Internet-related
companies may be newly formed and have limited operating history and experience.
Internet-related  companies  may  also  be  adversely  affected  by  changes  in
governmental  policies,   competitive   pressures,   and  changing  demand.  The
securities of these  companies may also experience  significant  price movements
caused by  disproportionate  investor  optimism or  pessimism  with little or no
basis in the company's fundamentals or economic conditions.


PAST PERFORMANCE

The  information  below  shows the  Funds'  annual  returns  and their long term
performance. The information provides some indications of the risks of investing
in the Funds.  The bar  charts  show you how the  performance  for each Fund has
varied from year to year. The tables compare each Fund's  performance  over time
to that of the Russell  2000,  a widely  recognized  unmanaged  index of smaller
companies.  How the  Funds  have  performed  in the past is not  necessarily  an
indication of how they will perform in the future.  The annual  report  contains

<PAGE>
additional  performance  information  which is available  upon  request  without
charge by writing or calling the Funds at the address and  telephone  number set
forth on the back of this Prospectus.


BARON ASSET FUND

Annual returns for periods ended 12/31 of each year              [bar chart]
- ---------------------------------------------------

25.0%  -18.5%  34.0%  13.9%   23.5%    7.4%  35.3%   22.9%   33.9%  4.3%       %
1989    1990   1991   1992    1993     1994  1995    1996    1997   1998    1999
Best Quarter:    4thQ 1998:    26.6%
Worst Quarter:   3rdQ 1990:   -24.%

Average annual total return for periods ended 12/31/98
- -------------------------------------------------------
[to be updated for 12.31.99]

                   1 year    5 years   10years   since inception (6.12.87)
Baron Asset Fund    4.3%     19.9%     16.9%     17.7%
Russell 2000       -2.6%     11.9%     12.9%     10.4%




BARON GROWTH FUND

Annual returns for periods ended 12/31 of each year              [bar chart]
- ---------------------------------------------------

                   52.5%     27.7%     31.1%     0.1%      %
                   1995      1996      1997      1998   1999
Best Quarter:   4thQ 1998:     22.6%
Worst Quarter: 3rd Q 1998:    -22.1%


Average annual total returns for periods ended 12/31/98
- -------------------------------------------------------
[to be updated for 12.31.99]

                         1 year    since inception (1.3.95)
Baron Growth Fund        0.1%      26.4%
Russell 2000            -2.6%      xxx




BARON SMALL CAP FUND

Annual returns for periods ended 12/31 of each year              [bar chart]
- ---------------------------------------------------

                                        2.2%      %
                                        1998   1999
Best Quarter:  4thQ 1998:   22.4%
Worst Quarter:      3rdQ 1998:   -28.1%
<PAGE>

Average annual total returns
for periods ended 12/31/98     [to be updated for 12.31.99]
- ----------------------------

                                  1 year    since inception (10/1/97)
Baron Small Cap Fund              2.2%      4.3%
Russell 2000                     -2.6%      xx %

There is no performance information for Baron iOpportunity Fund which is
scheduled to begin operations on February 29, 2000.


FUND EXPENSES
The table below  describes  the fees and expenses  that you would pay if you buy
and hold shares of the Funds.

ANNUAL FUND OPERATING EXPENSES (Expenses that are deducted from a Fund's assets)

<TABLE>
<CAPTION>
                         Management     Distribution      Other Expenses     Total Annual
                         Fee            (12b-1) Fee                          Fund Operating
                                                                             Expenses
<S>                      <C>            <C>               <C>                <C>
BARON ASSET FUND          1.0%           0.25%             0.06%              1.31%
BARON GROWTH FUND         1.0%           0.25%             0.15%              1.40%*
BARON SMALL CAP FUND      1.0%           0.25%             0.09%              1.34%
BARON iOPPORTUNITY FUND   1.0%           0.25%             0.25%**            1.50%**

</TABLE>

** "Other Expenses" are based on the estimated expenses that the Fund expects to
incur in its  initial  fiscal  year.  The Adviser  has  contractually  agreed to
reimburse certain expenses of the Fund so that its total operating  expenses are
limited to 1.5% of average net assets.  The advisory  contract is for an initial
period of two years.

Baron iOpportunity Fund imposes a short-term trading fee of 1% on redemptions of
shares held for less than 180 days.

EXAMPLE
This  example is intended to help you compare the cost of investing in the Funds
with the cost of investing in other mutual funds.  The example  assumes that you
invest $10,000 in the Fund 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  Funds'  operating  expenses
remain the same.  Although  your actual  costs may be higher or lower,  based on
these assumptions your costs would be:

================================================================================
YEAR                         1         3         5           10
================================================================================
BARON ASSET FUND             $133      $415      $718        $1,579
- --------------------------------------------------------------------------------
BARON GROWTH FUND            $143      $443      $766        $1,680
- --------------------------------------------------------------------------------
BARON SMALL CAP FUND         $136      $425      $734        $1,613
- --------------------------------------------------------------------------------
BARON iOPPORTUNITY FUND*     $153      $474       N/A         N/A
================================================================================

* Your estimated costs for Baron iOpportunity Fund for the one year period would
be $153 under the reimbursement  arrangement described in the footnote above and
for the three year period  would be $474.

There are additional charges if you have retirement accounts and wire transfers.
You also may purchase and redeem your shares  through  broker-dealers  or others
who may charge a commission or other  transaction fee for their  services.  (See
"How to Purchase Shares" and "How to Redeem Shares")

The 12b-1 fee is paid to Baron Capital,  Inc. for shareholder  and  distribution
services.  Because  the fees are paid out of the  Funds'  assets  on an  ongoing
basis,  over time it will increase the cost of your  investment and may cost you
more than paying other types of sales charges.



FINANCIAL HIGHLIGHTS

The financial  highlights  table is intended to help you  understand  the Funds'
financial  performance  for the  fiscal  years  indicated.  Certain  information
reflects financial results for a single fund share. The "total return" shows how
much your investment in the Fund would have increased (or decreased) during each
period,  assuming you had  reinvested  all  dividends and  distributions.  These
financial highlights have been audited by PricewaterhouseCoopers LLP, the Funds'
independent   accountants,   whose  report,  along  with  the  Funds'  financial
statements,  is included in the annual report. There are no financial highlights
for Baron iOpportunity Fund.


                               BARON ASSET FUND
- --------------------------------------------------------------------------------
                                  Year Ended
                                 September 30
<TABLE>

<CAPTION>
                                        1999  1998     1997     1996     1995     1994
<S>                                    <C>   <C>      <C>      <C>      <C>      <C>
- --------------------------------------------------------------------------------------
Net Asset Value Beginning of Year             $47.43   $35.50   $29.30   $22.82   $21.91
                                              ------   ------   ------   ------   ------
INCOME FROM INVESTMENT OPERATIONS

Net Investment Income (loss)......              0.05    (0.14)   (0.06)   (0.09)   (0.14)
Net Realized and Unrealized Gains
   (Losses) on Investments........             (7.52)   12.11     6.29     7.23     1.82
                                               ------   ------   ------   ------   ------
Total from Investment Operations..             (7.47)   11.97     6.23     7.14     1.68
                                               ------   ------   ------   ------   ------
LESS DISTRIBUTIONS

Dividends from Net Investment
   Income.........................              0.00     0.00     0.00     0.00     0.00
Distributions from Net Realized
   Gains..........................              0.00    (0.04)   (0.03)   (0.66)   (0.77)
                                               ------   ------   ------   ------   ------
Total Distributions...............              0.00    (0.04)   (0.03)   (0.66)   (0.77)
                                               ------   ------   ------   ------   ------
Net Asset Value, End of Year......            $39.96   $47.43   $35.50   $29.30   $22.82
                                               ======   ======   ======   ======   ======
TOTAL RETURN......................            (15.7%)   33.8%    21.3%    32.3%     8.0%
                                               ------   ------   ------   ------   ------

RATIOS/SUPPLEMENTAL DATA

Net Assets (in millions), End of
   Year...........................           $4,410.5 $3,224.5 $1,166.1  $290.0   $80.3
Ratio of Expenses to Average Net
   Assets.........................             1.32%    1.35%    1.40%    1.44%    1.59%
Ratio of net investment income
   (Loss) to Average Net Assets...             0.11%   (0.52%)  (0.29%)  (0.55%)  (0.71%)
Portfolio Turnover Rate...........            23.43%   13.23%   19.34%   35.15%   55.87%
- ------------------------------------------------------------------------------------------
</TABLE>
<PAGE>

The  Fund's  adviser  and/or  Baron  Capital  reimbursed  the Fund for  expenses
aggregating  $8,561  (less  than $0.01 per  share) in 1990,  $27,315  ($0.01 per
share) in 1989, and $83,219 ($0.11 per share) in 1988. The reimbursement amounts
are excluded from the expense data above.


                           BARON GROWTH FUND
- --------------------------------------------------------------------------------
                               Year Ended
                              September 30
<TABLE>
<CAPTION>
                                          1999    1998     1997    1998    1995*
<S>                                      <C>    <C>      <C>     <C>     <C>
- -------------------------------------------------------------------------------------
Net Asset Value Beginning of Year.....           $24.89   $18.40  $14.77  $10.00
                                                 ------   ------  ------  ------
INCOME FROM INVESTMENT OPERATIONS

Net Investment Income ................             0.06     0.06    0.11    0.04
Net Realized and Unrealized Gains
   (Losses) on Investments............            (4.56)    6.68    3.66    4.73
                                                 ------   ------  ------  ------
Total from Investment Operations......            (4.50)    6.74    3.77    4.77
                                                 ------   ------  ------  ------
LESS DISTRIBUTIONS

Dividends from Net Investment
   Income.............................            (0.02)   (0.09)  (0.04)   0.00
Distributions from Net Realized
   Gains..............................            (0.05)   (0.16)  (0.10)   0.00
                                                 ------   ------  ------  ------
Total Distributions...................            (0.07)   (0.25)  (0.14)   0.00
                                                 ------   ------  ------  ------
Net Asset Value, End of Year..........           $20.32   $24.89  $18.40  $14.77
                                                 ======   ======  ======  ======
TOTAL RETURN..........................           (18.1%)   37.1%   25.8%   47.7%

RATIOS/SUPPLEMENTAL DATA

Net Assets (in millions), End of
   Year...............................           $315.6   $390.8   $207.2  $28.6
Ratio of Total Expenses to Average Net
   Assets.............................           1.43%    1.40%    1.54%    1.99%**
Less: Ratio of Interest Expenses to
   Average Net Assets                           (0.06%)   0.00%    0.00%    0.00%
                                                ------   ------   ------   ------
Ratio of expenses to Average Net
   Assets exclusive of interest expense          1.37%    1.40%    1.54%    1.99%**
                                                ------   ------   ------   ------
Ratio of net investment income to
   Average Net Assets.......                     0.21%    0.37%    1.20%    1.13%**
Portfolio Turnover Rate.............            40.38%   25.17%   40.27%   40.56%
- --------------------------------------------------------------------------------------
</TABLE>
*    For the period  January 3, 1995  (commencement  of operations) to September
     30, 1995.
**   Annualized.

     The Fund's  custodian  offset  custody fees of  $5,252(less  than $0.01 per
     share) in 1996 and $12,003(less  than $0.01 per share) in 1995. The expense
     ratio is gross of the custodian offset.




                             BARON SMALL CAP FUND
- --------------------------------------------------------------------------------
                                Year Ended
                               September 30
                                                   1999         1998*
- --------------------------------------------------------------------------------
Net Asset Value Beginning of Year...........                   $10.00
                                                               ------
INCOME FROM INVESTMENT OPERATIONS

Net Investment Loss.........................                    (0.02)
Net Realized and Unrealized
   Losses on Investments....................                    (1.37)
                                                               -------
Total from Investment Operations............                    (1.39)
                                                               -------
LESS DISTRIBUTIONS

Dividends Net Investment Income.............                     0.00
Distributions from Net Realized Gains.......                     0.00
                                                               -------
Total Distributions.........................                     0.00
                                                               -------
Net Asset Value, End of Year................                   $ 8.61
                                                               =======
TOTAL RETURN................................                   (13.9%)
                                                               -------

<PAGE>

RATIOS/SUPPLEMENTAL DATA

Net Assets(in millions), End of Year........                    $403.7
Ratio of Expenses to Average Net Assets.....                     1.39%
Ratio of net investment Loss
   to Average Net Assets....................                    (0.20%)
Portfolio Turnover Rate.....................                    59.68%
- ------------------------------------------------------------------------------

*    For the period  October 1, 1997  (commencement  of operations) to September
     30, 1998.

<PAGE>
OTHER INVESTMENT STRATEGIES

WHAT ARE SOME OF THE OTHER INVESTMENTS THE FUNDS MAKE?

CASH POSITION When the Adviser  determines  that  opportunities  for  profitable
investments  are  limited or that  adverse  market  conditions  exist,  all or a
portion of the Funds' assets may be invested in cash or cash equivalents such as
money market instruments, which include U.S. Government securities, certificates
of deposit,  short-term  investment  grade corporate bonds and other  short-term
debt instruments,  and repurchase agreements.  When a Fund's investments in cash
or similar investments increase,  its investment objectives may not be achieved.
BARON  ASSET FUND may borrow up to 5% of its net  assets  for  extraordinary  or
emergency  temporary  investment  purposes or to meet redemption  requests which
might otherwise require an untimely sale of portfolio  securities.  BARON GROWTH
FUND, BARON SMALL CAP FUND and BARON  iOPPORTUNITY  FUND may borrow up to 30% of
the value of their respective total assets, including the amount borrowed, as of
the time the borrowing is made for temporary, emergency or other purposes.

DEBT SECURITIES The Funds may invest in debt securities which may include notes,
bonds,  debentures and money market  instruments.  Debt securities  represent an
obligation  of the issuer to repay a loan of money to it,  often with  interest.
The debt  securities  in which the Funds may invest  include  rated and  unrated
securities and convertible instruments.  There is no minimum rating for the debt
securities  that  may be  purchased  for  those  Funds.  The  Funds  rely on the
Adviser's  assessment  of the  issuer's  securities  and do not use  independent
ratings organizations.

ILLIQUID  SECURITIES  BARON  ASSET FUND may invest up to 10%,  and BARON  GROWTH
FUND, BARON SMALL CAP FUND and BARON  iOPPORTUNITY FUND may invest up to 15%, of
their  respective  net  assets in  securities  that are  illiquid.  An  illiquid
security is one that cannot be  disposed of in the  ordinary  course of business
within seven days.

SPECIAL  SITUATIONS  The Funds may  invest in  "special  situations."  A special
situation  arises  when,  in the opinion of the  Adviser,  the  securities  of a
company will be recognized and appreciate in value due to a specific anticipated
development at that company.  Such developments  might include a new product,  a
management change, an acquisition or a technological advancement.

FOREIGN  SECURITIES The Funds may invest without limitation in the securities of
foreign issuers in U.S.  denominated form known as American Depository Receipts.
They may also invest in foreign  denominated form (Global Depository Receipts or
European Depository Receipts),  up to 10% of the respective total assets of BAF,
BGF and BSCF and up to 25% of the total assets of BiOPPF.

OPTIONS AND  DERIVATIVES  BARON ASSET FUND may write (sell) covered call options
or purchase  put options on equity  and/or debt  securities.  BARON GROWTH FUND,
BARON SMALL CAP FUND and BARON  iOPPORTUNITY  FUND may write  (sell) put options
and covered call options and purchase put and call options on equity and/or debt
securities.  A call option gives the  purchaser of the options the right to buy,
and when exercised  obligates the writer to sell, the underlying security at the
<PAGE>
exercise  price.  A put option  gives the  purchaser  of the option the right to
sell, and when exercised obligates the writer to buy, the underlying security at
the exercise price. The options may be listed or over-the-counter. The Funds may
also enter into equity swap agreements and other derivative investments.

OTHER   STRATEGIES  The  Funds  have   additional   investment   strategies  and
restrictions that govern their activities.  For a list of these restrictions and
more  information  about  the  investment  strategies,  please  see the  section
"Investment  Goals,  Strategies  and  Risks"  in  the  Statement  of  Additional
Information.  Those that are identified as "fundamental"may only be changed with
shareholder approval, while the others may be changed by the Board of Trustees.

WHAT ARE SOME ADDITIONAL RISK FACTORS?

OPTIONS AND  DERIVATIVES  Options may fail as hedging  techniques in cases where
the price  movements of the securities  underlying the options do not follow the
price  movements  of the  portfolio  securities  subject to the hedge.  Gains on
investments  in  options  and  derivatives  depend on the  Adviser's  ability to
anticipate  correctly the direction of stock prices,  interest rates,  and other
economic  factors.  The  dealer  who  takes  the  other  side  of  a  derivative
transaction could fail. Where a liquid secondary market does not exist, the Fund
would likely be unable to control losses by closing its position.

DEBT SECURITIES Lower rated securities may have a higher yield and the potential
for a greater  return than  investment  grade  securities but may also have more
risk. Lower rated  securities are generally meant for longer-term  investing and
may be subject to certain risks with respect to the issuing entity and to market
fluctuations.  See the SAI for more information.  The Adviser will also evaluate
the  securities  and the ability of the issuers to pay interest  and  principal.
With lower rated debt  securities,  a Fund's  ability to achieve its  investment
objective may be more dependent on the Adviser's  credit  analysis than might be
the case with higher rated securities. The market price and yield of lower rated
securities  are generally  more volatile than those of higher rated  securities.
Factors adversely  affecting the market price and yield of these securities will
adversely  affect the  Fund's  net asset  value.  The  trading  market for these
securities  may be less liquid than that of higher rated  securities.  Companies
that issue lower rated  securities may be highly  leveraged or may have unstable
earnings,  and consequently the risk of the investment in the securities of such
issuers may be greater than with higher rated securities.

The interest bearing features of debt securities carry a promise of income flow,
but the price of the  securities  are inversely  affected by changes in interest
rates and are therefore  subject to the risk of market price  fluctuations.  The
market values of debt  securities  may also be affected by changes in the credit
ratings or financial condition of the issuers.

FOREIGN SECURITIES Investments in foreign securities may have greater risks than
investments in domestic  securities and such risks may be unrelated to the price
of the security.  Such risks include  currency  exchange  risks, as the value of
local currency relates to the U.S.  dollar.  The value of a foreign security may
be worth less in U.S. Dollars even if the security increases in value in its own
country due to declines  in exchange  rates or changes in U.S. or foreign  laws.
Foreign   investments   are  also  subject  to  political  and  economic  risks,
<PAGE>
particularly  in countries with unstable  governments,  different legal systems,
and limited  industries.  In some countries there may be the risk of governments
seizing  the  assets or  operations  of a  company.  Further,  there may be less
governmental supervision of foreign markets, including non-standardize financial
reporting and less publicly available  information.  There is also the risk that
the foreign securities may be less liquid,  there may be delays in settlement of
purchase  and sale  transactions,  and there may not be adequate  protection  to
ensure the other side will complete a transaction.

CONVERTIBLE  SECURITIES  Since  convertible  securities  combine the  investment
characteristics  of  both  bonds  and  common  stocks,  the  Funds'  convertible
securities  investments  absorb the market  risks of both stocks and bonds.  The
combination does,  however,  make the investment less sensitive to interest rate
changes than straight bonds of comparable  maturity and quality and usually less
volatile than common stocks.  Because of these factors,  convertible  securities
are likely to perform  differently than broadly-based  measures of the stock and
bond markets.

BORROWINGS  To the extent a Fund  borrows,  it must  maintain  continuous  asset
coverage of 300% of the amount  borrowed.  Such borrowing has special risks. Any
amount borrowed will be subject to interest costs that may or may not exceed the
appreciation of the securities purchased.

ILLIQUID  SECURITIES  The absence of a trading market could make it difficult to
ascertain a market value for illiquid positions.  A Fund's net asset value could
be adversely affected if there were no ready buyer at an acceptable price at the
time the Fund decided to sell.  Time-consuming  negotiations  and expenses could
occur in disposing of the shares.

SPECIAL  SITUATIONS  Investments  in special  situations  have the risk that the
anticipated  development  does  not  occur  or does  not  attract  the  expected
attention.


MANAGEMENT OF THE FUND
The Board of Trustees  oversees the management of the Funds. A list of the Board
members and the Funds'  officers  may be found in the  Statement  of  Additional
Information. BAMCO, Inc., the Adviser, is located at 767 Fifth Avenue, New York,
New York 10153, and is responsible for portfolio management.  It is a subsidiary
of Baron Capital Group, Inc. ("BCG").  Baron Capital, Inc. ("Baron Capital"),  a
registered broker-dealer and the distributor of the shares of the Funds, is also
a subsidiary of BCG.

Ronald Baron is the founder, chief executive officer and chairman of the Adviser
and BCG and is the principal  owner of BCG.  Morty Schaja has been the president
of the Adviser and BCG since 1991.

Mr.  Baron has been the  portfolio  manager of BARON ASSET FUND and BARON GROWTH
FUND since their  inception.  He has managed money for others since 1975.  Since
January 1999, BARON GROWTH FUND has been managed by a team that is headed by Ron
Baron and that  includes  Matt  Ervin and Mitch  Rubin.  Matt  Ervin has been an
analyst  with Baron  Funds for 5 years and before that was an analyst at another
large money management firm. Mitch Rubin has worked at Baron Funds as an analyst
for 4 years and  before  that was an analyst at a large  brokerage  firm.  Cliff
Greenberg  has been the  portfolio  manager  of BARON  SMALL CAP FUND  since its

<PAGE>
inception. Mr. Greenberg joined Baron Funds in January of 1997. He was a general
partner and portfolio manager at HPB Associates, L.P., an investment partnership
from  January  1990 until he joined  Baron  Funds.  BARON  iOPPORTUNITY  FUND is
managed  by  co-portfolio  managers  Mitch  Rubin and Matt  Ervin.  All of BARON
iOPPORTUNITY FUND's holdings will be pre-approved by Morty Schaja and Ron Baron.
Each of the portfolio  managers  named above may serve as portfolio  managers or
analysts for other products offered by affiliates that could conflict with their
responsibilities to the Funds for which they are portfolio mangers.  The Adviser
also keeps the books of account of each Fund,  and  calculates  daily the income
and net asset  value per  share of each  Fund.  For its  services,  the  Adviser
receives  a fee  payable  monthly  from the  assets of each Fund equal to 1% per
annum of each Fund's respective average daily net asset value.

Brokerage transactions for the Funds in exchange-listed  securities are executed
primarily by or through the Adviser's affiliate,  Baron Capital, when consistent
with  trying to obtain the best net results  for the Funds.  Baron  Capital is a
registered  broker-dealer  and a member of the NASD. Please see the Statement of
Additional Information for more information about trade executions.

12b-1 PLAN
The Funds have  adopted a plan  under  rule  12b-1  that  allows the Fund to pay
distribution fees for the sale and distribution of their shares and for services
provided to shareholders.  Because the fees are paid out of the Funds' assets on
an  on-going  basis,  over  time  these  fees  will  increase  the  cost of your
investment and may cost you more than paying other types of sales  charges.  The
12b-1 plan authorizes the Fund to pay Baron Capital a distribution  fee equal on
an  annual  basis to 0.25% of each  Fund's  average  daily net  assets.  See the
Statement of Additional  Information for a more detailed listing of the expenses
covered by the Distribution Plan.



<PAGE>
INFORMATION ABOUT YOUR INVESTMENT

HOW YOUR SHARES ARE PRICED

The  purchase or sale price for your shares is the  particular  Fund's net asset
value  per  share  ("NAV"),  which is  generally  calculated  as of the close of
trading of the New York Stock Exchange  (usually 4:00 p.m. Eastern time) on each
day the Exchange is open.  Your  purchase or sale will be priced at the next NAV
calculated  after your order is accepted by the Baron Funds'  transfer agent. If
you purchase or sell shares through a brokerage  firm,  bank or other  financial
institution,  your  transaction  will receive the NAV next calculated  after the
financial  institution  receives  your  order.  The Funds have  agreements  with
certain  financial  institutions  which authorize the financial  institutions to
accept  orders or  designate  third  parties  to accept  orders on behalf of the
Funds. If you place your order through these authorized financial  institutions,
the order will be  considered  received  when the  authorized  party accepts the
order.  Those orders will receive the NAV next computed after  acceptance of the
order by the authorized  institution or its agent.  The Funds'  investments  are
valued based on the last sale price or where market  quotations  are not readily
available,  based on fair value as determined by the Adviser,  using  procedures
established  by the Board of  Trustees.  The Funds may  change the time at which
orders are priced if the  Exchange  closes at a different  time or an  emergency
exists.

HOW TO PURCHASE SHARES

You may purchase shares of the Funds directly without paying a sales charge.  An
application is included with this prospectus. Special applications are available
to open individual retirement accounts ("IRAs").  The minimum initial investment
is $2,000  unless you choose to invest  through the Baron  InvestPlan  (see page
XX).  There is no minimum  for  subsequent  purchases.  The Funds may reject any
proposed  purchase.  If the Funds identifies  short term traders,  the Fund will
reject their proposed purchases.

At present,  only U.S. citizens and non-U.S.  citizens with a tax identification
number who reside in the U.S. may purchase shares of the Funds.  Please call the
Funds' transfer agent at 1-800-442- 3814, if you have any questions.

You may invest or add to your account using any of the following methods:

BY MAIL

TO OPEN A NEW ACCOUNT send your signed  application form with your check payable
to BARON FUNDS to:

     Baron Funds
     P.O. Box 219946
     Kansas City, MO 64121-9946

PLEASE  MAKE SURE YOU  INDICATE  HOW MUCH MONEY YOU WANT  INVESTED IN EACH FUND.
Checks must be payable in U.S.  dollars and must be drawn on a U.S. bank.  Third
party  checks,  credit cards and cash will not be accepted.

WHEN ADDING TO YOUR ACCOUNT complete the additional  investment form provided at
the bottom of your  account  statement or purchase  confirmation.  If you do not
have that form,  write a note  indicating  in which  Baron  Fund the  investment
should go and the account number. Send it to the address above.

BY WIRE
You can make your initial or additional  investments in the Funds by wire. To do
so: (1) contact the Funds' transfer agent, DST Systems,  Inc., at 1-800-442-3814
to obtain an account number. (2) Complete and sign the application form and mail
it to Baron Funds,  P.O. Box 219946,  Kansas City, MO  64121-9946.  (3) Instruct
your bank to wire funds to the United  Missouri Bank of Kansas City,  N.A.,  ABA
No. 1010-0069-5, Account No. 98-7037-101-4. (4) Be sure to specify the following
information in the wire: (a) Fund you are buying,  (b) your account number,  (c)
your name, and (d) your wire number.

Please  be sure to  include  your  name  and  account  number.  The  Fund is not
responsible for delays in the wiring process.

BY TELEPHONE
Once  your  account  is open you may add to your  investment  by  telephone  and
exchange  among  the  Baron  Funds  if  you  have  elected  that  option  on the
application.  By choosing this option you authorize  Baron Funds to draw on your
bank account. Please note that your accounts must be identically registered.  To
add this option to your account, call 1-800-442-3814 for the forms.

BARON INVESTPLAN
Baron  InvestPlan  is an automatic  investment  plan  offered by the Funds.  The
minimum initial investment is $500 with monthly  investments of as little as $50
automatically  invested  from  your  checking  account.  To  enroll in the Baron
InvestPlan,  complete the Enrollment Form (available by calling 1-800-99-BARON),
attach a voided  check and mail them to Baron  Funds,  P.O.  Box 419946,  Kansas
City, MO 64141-6946.

THROUGH BROKER-DEALERS
You may purchase shares of the Funds through a broker-dealer  or other financial
institution  that may  charge a  transaction  fee.  If you  purchase  the shares
directly  from  the  Funds,  no  transaction  fee is  charged.  The  Funds  also
participate in no transaction fee programs with many national brokerage firms.

HOW TO REDEEM SHARES
You may redeem your shares of the Funds by any of the methods  described  below.
There are no  redemption  charges.  If you are selling  shares in an IRA account
please read the information in the IRA kit.  Redemptions  will not be made until
all of the  requirements  for redemption are met.  Redemptions are priced at the
next NAV calculated after your redemption request is received in proper form. If
you have recently  purchased  shares your redemption  request may not be honored
until the purchase check has cleared your bank,  which  generally  occurs within
ten calendar days.

<PAGE>
BY MAIL
Write  a  letter  that  includes  the  following  information:  the  name of the
registered  owner(s) of the account,  the name of the Fund, the number of shares
or dollar  amount to be  redeemed,  and the account  number.  The letter must be
signed  in  exactly  the same  way the  account  is  registered,  including  the
signature of each joint owner,  if applicable.  Mail the request to the transfer
agent at Baron Funds, P.O. Box 219946, Kansas City, MO 64121-9946.

A signature guarantee is required for redemptions greater than $50,000.  See the
"Special  Information About  Redemptions"  section on page XX. Within three days
after receipt of a redemption  request by the transfer agent in proper form, the
Fund will normally mail you the proceeds.

BY TELEPHONE
If you have  selected  the  telephone  redemption  option  when you opened  your
account,  you may redeem  your shares by  telephone.  To add this option to your
account call  1-800-442-3814  for a telephone  redemption  form. Once made, your
telephone  request cannot be changed.  The minimum amount that you may redeem by
telephone is $1,000.  The maximum amount that you may redeem by telephone in any
quarter is $50,000.  You may receive  the  proceeds by any one of the  following
methods:  (a) we will  mail a check to the  address  to which  your  account  is
registered,  (b) we will transmit the proceeds by electronic funds transfer to a
pre-authorized bank account (usually a two banking day process),  or (c) we will
wire the proceeds to a  pre-authorized  bank account for a $10.00 fee (usually a
next banking day process).

The Funds have the right to refuse a  telephone  redemption  if they  believe it
advisable  to do so.  If you  have  selected  the  telephone  option  you may be
responsible  for any fraudulent  telephone  order as long as the Funds and their
transfer agent use reasonable procedures to confirm that telephone  instructions
are genuine.

BY BROKER-DEALER

You may redeem  shares  through  broker-dealers  or other  institutions  who may
charge you a fee. The Funds may have special redemption  procedures with certain
broker-dealers.

SHORT-TERM TRADING FEE

BARON  iOPPORTUNITY  FUND imposes a  short-term  trading fee on  redemptions  of
shares held for less than 180 days. The fee is 1% of the redemption value and is
deducted from the redemption proceeds.  The Fund uses the "first-in,  first-out"
method to determine  the holding  period,  so if you bought  shares on different
days, the shares purchased first will be redeemed first for determining  whether
the fee  applies.  The fee is  retained  by the  Fund  for  the  benefit  of the
remaining  shareholders  to offset  the  administrative  costs  associated  with
processing  redemptions  and to  offset  the  portfolio  transaction  costs  and
facilitate portfolio management.

The Fund will waive the fee for defined  contribution  plans. The Fund may waive
the fee on  redemptions  if the Fund  believes it is in the best interest of the
Fund.  Please check with your account  representative  before you purchase  your
shares to determine whether the fee waiver is applicable.

<PAGE>
SPECIAL INFORMATION ABOUT REDEMPTIONS

If the amount to be redeemed is greater than $50,000, all of the signatures on a
redemption  request and/or  certificate must be guaranteed.  If you have changed
your address within 30 days of a redemption  request,  a signature  guarantee is
required.  A signature guarantee helps protect you and the Funds from fraud. You
can obtain a signature  guarantee from most securities  firms or banks,  but not
from a notary public. If you are redeeming  $50,000 or less per quarter,  and if
proceeds are sent to the address of record, no signature  guarantee is required.
For joint  accounts,  each signature must be guaranteed.  Please call if you are
unsure of any of the  requirements.  Please  remember  that the  Funds  will not
redeem your shares until the original  letter of instruction  with the signature
guarantee in proper form has been received by the transfer agent.

Any Fund share  certificates  that have been issued  must be returned  with your
redemption  request.  The transfer  agent may require other  documentation  from
corporations,  trustees,  executors,  and  others  who hold  shares on behalf of
someone else. If you have any questions concerning the requirements, please call
the transfer agent at 1-800-442-3814.  Redemptions will not be made until all of
the conditions,  including receipt of all required documentation by the transfer
agent, have been satisfied.

A redemption or exchange of Fund shares may generate a tax liability.

If you redeem  more than  $250,000 or 1% of the net asset value of a Fund during
any 90-day period,  the Fund has the right to pay the redemption  price,  either
totally or partially, by a distribution of portfolio securities instead of cash.

If your account falls below $2,000 because of withdrawals,  the Fund may ask you
to increase  your balance.  If it is still below $2,000 after 60 days,  the Fund
may close your account and send you the proceeds.

The Funds may suspend the normal  redemption  process if trading on the New York
Stock Exchange is suspended or if an emergency exists that reasonably  precludes
the valuation of the Funds' net assets.

DISTRIBUTIONS AND TAXES

Each Fund pays its  shareholders  dividends from its net  investment  income and
distributes any net realized  capital gains once each year.  Your  distributions
will be reinvested in the Fund unless you instruct the Fund otherwise. There are
no charges on reinvestments.  After every distribution,  the value of a share is
automatically  reduced  by the amount of the  distribution.  If you elect not to
reinvest and the postal or other delivery service is unable to deliver checks to
your address of record,  your  distribution  will be  reinvested  in  additional
shares. No interest will accrue on amounts represented by uncashed  distribution
or redemption checks.

You are  subject  to  federal  income  tax on Fund  distributions,  unless  your
investment is in an IRA or other  tax-advantaged  account. The tax status of any
distribution  is the same  regardless  of how long you have invested in the Fund
and whether you reinvest  your  distributions  or take them in cash.  Income and
short-term  capital gain  distributions  are taxed at the ordinary  income rate.
Long-term capital gains  distributions are taxed at either 10% or 20%, depending
on your tax bracket.  The tax status of the annual distribution will be detailed

<PAGE>
in an annual tax statement from the Fund. Distributions declared by the Fund may
also be subject to state and local taxes.  You should  consult with your own tax
adviser regarding your personal tax situation.

If you do not  provide  the Fund with your valid  social  security  or  taxpayer
identification number, you will be subject to backup withholding for taxes.


GENERAL INFORMATION

CUSTODIAN, TRANSFER AGENT AND DIVIDEND AGENT

The Bank of New  York,  100  Church  Street,  New  York,  New York  10286 is the
custodian for the Baron Funds' cash and securities.  DST Systems, Inc. serves as
transfer  agent  and  dividend  disbursing  agent for the  shares.  They are not
responsible for investment decisions for the Baron Funds.


SHAREHOLDER INFORMATION

If you have  questions  about your account or  transactions  please  contact the
transfer agent, DST Systems,  Inc., P.O. Box 219946, Kansas City, MO 64121-9946,
or by telephone to 1-800-442-3814.

If you have  questions  about  general  Fund  information  please call the Baron
Funds' office at 1-800-99-BARON or 212-583-2100.

As a Massachusetts business trust, annual shareholder meetings are not required.
The Funds send quarterly reports to shareholders.








<PAGE>
[for back cover page]
FOR MORE INFORMATION
Investors  who want  more  information  about the Baron  Funds  may  obtain  the
following documents free upon request at the numbers or address below.

SHAREHOLDER REPORTS
Additional  information about the Funds'  investments is available in the Fund's
quarterly  reports to Shareholders.  In the Funds' annual report you will find a
discussion of the market conditions and investment strategies that significantly
affected the Funds' performance during the last fiscal year.

STATEMENT OF ADDITIONAL INFORMATION
Additional  information  is  also  contained  in  the  Statement  of  Additional
Information   dated  January  17,  2000.  A  current   Statement  of  Additional
Information is on file with the Securities and Exchange  Commission  ("SEC") and
is  incorporated  by  reference.  You may obtain  the  Statement  of  Additional
Information and the shareholder reports without charge by writing or calling the
Funds.

TO OBTAIN INFORMATION
BY TELEPHONE
     Call 1-800-992-2766
BY MAIL
     Write to: Baron Funds
               767 Fifth Avenue
               New York, NY 10153
BY E-MAIL
     Send your request to:  [email protected]
ON THE INTERNET
     Text-only  versions  of Baron  Funds  documents  can be viewed  on-line  or
downloaded from:
     http://www.baronfunds.com
or from:
     http://www.sec.gov
OTHER
You can also  obtain  copies by  visiting  the SEC's  Public  Reference  Room in
Washington,  D.C.  (phone  1-800-SEC-0330).  Copies of this  information  may be
obtained,  upon payment of a  duplicating  fee, by writing the Public  Reference
Section of the SEC, Washington, D.C. 20549- 6009.

Ticker Symbols:  Baron Asset Fund         BARAX
                 Baron Growth Fund        BGRFX
                 Baron Small Cap Fund     BSCFX
                 Baron iOpportunity Fund  BIOFX (Tentative)

SEC file number:  811-5032
<PAGE>


                                BARON ASSET FUND
                                BARON GROWTH FUND
                              BARON SMALL CAP FUND
                             BARON iOPPORTUNITY FUND

                                767 Fifth Avenue
                            New York, New York 10153
                                 (800) 99-BARON
                                  212-583-2100

                            ________________________


                       STATEMENT OF ADDITIONAL INFORMATION
                                January 17, 2000

                            ________________________



This Statement of Additional Information ("SAI") is not a prospectus. The Fund's
Prospectus, dated January 17, 2000, may be obtained without charge by writing or
calling the Funds at the address and telephone number above.


                            ________________________



















No  person  has  been  authorized  to  give  any  information  or  to  make  any
representations  other  than  those  contained  in  this  SAI or in the  related
Prospectus.





<PAGE>

                                TABLE OF CONTENTS
                                -----------------


                                                   PAGE IN
                                                   STATEMENT
                                                   OF
                                                   ADDITIONAL     PAGE IN
                                                   INFORMATION    PROSPECTUS
                                                   -----------    ----------


FUND HISTORY AND CLASSIFICATION................         X
 Investment Goals, Strategies and Risks........         X            X
 Options Transactions and Swaps................         X            X
 Use of Segregated and Other Special Accounts..         X
 Investment Restrictions.......................         X
 Turnover Rate.................................         X


MANAGEMENT OF THE FUNDS........................         X            X
 Board of Trustees and Officers................         X
 Principal Holders of Shares...................         X
 Investment Adviser............................         X
 Distribution Plan.............................         X            X
 Brokerage.....................................         X
 Custodian, Transfer Agent and Dividend Agent..         X            X


REDEMPTION OF SHARES...........................         X            X


NET ASSET VALUE................................         X            X


TAXES..........................................         X            X


ORGANIZATION AND CAPITALIZATION................         X
 General.......................................         X            X
 Shareholder and Trustee Liability.............         X            X



OTHER INFORMATION..............................                      X

<PAGE>

FUND HISTORY AND CLASSIFICATION
- -------------------------------

BARON  ASSET  FUND is a no-load,  open-end,  diversified  management  investment
company  organized  as a  series  fund  and  established  under  the laws of the
Commonwealth  of  Massachusetts  on  February  19,  1987.  There are five series
currently available (individually a "fund" and collectively the "funds"):  BARON
ASSET FUND,  started in June of 1987,  BARON GROWTH FUND  (formerly  named Baron
Growth & Income Fund), started in January of 1995, BARON SMALL CAP FUND, started
October  1,1997,  and  one new  fund,  BARON  iOPPORTUNITY  FUND,  which  starts
operations on February 29, 2000.

INVESTMENT GOALS, STRATEGIES AND RISKS
- --------------------------------------

BARON ASSET FUND's investment  objective is to seek capital appreciation through
investments in securities of small and medium sized  companies with  undervalued
assets or favorable growth prospects.  BARON GROWTH FUND's investment  objective
is to seek capital appreciation.  BARON SMALL CAP FUND's investment objective is
to seek capital  appreciation  through  investments  primarily in  securities of
small companies.  The investment objective of BARON iOPPORTUNITY FUND is capital
appreciation.  BARON  ASSET FUND  invests  primarily  in small and medium  sized
companies  with  market  capitalizations  of  approximately  $500  million to $3
billion.  BARON  GROWTH FUND and BARON SMALL CAP FUND  invest  primarily  in the
securities of smaller  companies  with market  values of up to $1.5 billion.  At
least 65% of BARON  SMALL  CAP  FUND's  total  assets,  measured  at the time of
purchase, are invested in smaller companies,  BARON iOPPORTUNITY FUND invests in
companies of all sizes.

In addition to the principal investment strategies of the Funds described in the
Prospectus  on  pages X and X,  the  Funds  may use  the  additional  strategies
described below.  These investment  strategies are not fundamental  policies and
may be changed by the Fund's Board of Trustees.  Shareholders  would be notified
of any material changes. Some of the strategies discussed below are mentioned in
the Prospectus, but are explained in more detail here.

FOREIGN SECURITIES BAF, BGF and BSC may invest up to 10% and BiOpp may invest up
to 25%of their  respective  total assets  directly in the  securities of foreign
issuers which are not publicly traded in the U.S. and may also invest in foreign
securities in domestic  markets through  depositary  receipts  without regard to
this limitation.  These  securities may involve  additional risks not associated
with securities of domestic  companies,  including  exchange rate  fluctuations,
political or economic  instability,  the  imposition  of exchange  controls,  or
expropriation  or  confiscatory  taxation.  Issuers  of foreign  securities  are
subject to different, often less detailed, accounting,  reporting and disclosure
requirements  than are  domestic  issuers.  The Funds may  invest in  securities
commonly  known  as  American  Depository  Receipts  ("ADRs"),  and in  European
Depository  Receipts ("EDRs") and Global  Depository  Receipts ("GDRs") or other
securities convertible into securities of foreign issuers. ADRs are certificates
issued by a U.S.  bank or trust  company  and  represent  the  right to  receive
securities of a foreign issuer deposited in a domestic bank or foreign branch of
a United  States bank and traded on a U.S.  exchange  or in an  over-the-counter
market.  EDRs and GDRs are receipts issued in Europe generally by a non-U.S bank
or trust company that  evidence  ownership of non-U.S.  or domestic  securities.
There are no fees imposed on the purchase or sale of ADRs, EDRs or GDRs although
the issuing  bank or trust  company may impose fees on the purchase of dividends
and the  conversion  of  ADRs,  EDRs and GDRs  into the  underlying  securities.
Investment  in  ADRs  has  certain  advantages  over  direct  investment  in the
underlying  non-U.S.  securities,  since  (i) ADRs are U.S.  dollar  denominated
investments  which are easily  transferable and for which market  quotations are
readily  available and (ii) issuers whose securities are represented by ADRs are
subject to the same auditing,  accounting and financial  reporting  standards as
domestic issuers. EDRs and GDRs are not necessarily  denominated in the currency
of the underlying security.

REITs The Funds may invest in the equity  securities  of real estate  investment
trusts ("REITs"). A REIT is a corporation of business trust that invests in real
estate and derives its income from rents from real property or interest on loans
secured by mortgages on real property. The market value of REITs may be affected
by changes in the tax laws or by their  inability  to qualify  for the  tax-free
pass-through  of their  income.  The REIT portion of the  portfolio  may also be
affected  by general  fluctuations  in real  estate  values and by  defaults  by
borrowers or tenants.

<PAGE>

LENDING The Funds may lend their portfolio securities to institutions as a means
of earning additional income. In lending their portfolio  securities,  the Funds
may incur  delays in  recovery of loaned  securities  or a loss of rights in the
collateral.  To minimize  such risks,  such loans will only be made if the Funds
deem the other  party to be of good  standing  and  determines  that the  income
justifies  the risk.  BARON  ASSET FUND will not lend more than 10% of its total
assets and BARON GROWTH FUND, BARON SMALL CAP FUND and BARON  iOPPORTUNITY  FUND
will not lend more than 25% of their respective total assets.

MORTGAGE-BACKED  SECURITIES  The Funds may  invest up to 5% of their  respective
assets in  mortgage-backed  securities  that are  issued or  guaranteed  by U.S.
government  agencies  or  instrumentalities,  such  as the  Government  National
Mortgage   Association   and  the   Federal   National   Mortgage   Association.
Mortgage-backed securities represent direct or indirect participation in, or are
secured by and payable  from,  mortgage  loans secured by real  property.  These
securities are subject to the risk that prepayments on the underlying  mortgages
will cause the  principal and interest on the  mortgage-backed  securities to be
paid prior to their stated maturities.  Mortgage  prepayments are more likely to
accelerate during periods of declining long-term interest rates. If a prepayment
occurs,  the Funds  may have  unanticipated  proceeds  which it may then have to
invest at a lower interest rate, and may be penalized by not having participated
in a comparable security not subject to prepayment.

WHEN-ISSUED  SECURITIES The Funds may invest up to 5% of their respective assets
in debt and equity  securities  purchased on a when-issued  basis.  Although the
payment and interest terms of when-issued securities are established at the time
the purchaser enters into the commitment, the actual payment for and delivery of
when-issued  securities generally takes place within 45 days. The Fund bears the
risk that  interest  rates on debt  securities  at the time of  delivery  may be
higher or lower than those contracted for on the when-issued  security.  Failure
of the issuer to deliver  the  security  purchased  on a  when-issued  basis may
result in a loss or missed opportunity to make an alternative investment.

MEDIUM AND LOWER RATED  CORPORATE DEBT SECURITIES All of the Funds may invest up
to 35% of their respective total assets in debt securities that are rated in the
medium to lowest  rating  categories  by S&P and  Moody's,  some of which may be
known as "junk bonds."

The Funds  will rely on the  Adviser's  judgment,  analysis  and  experience  in
evaluating debt  securities.  The Adviser  believes that the difference  between
perceived risk and actual risk creates the  opportunity  for profit which can be
realized through thorough analysis. Ratings by S&P and Moody's evaluate only the
safety of principal and interest  payments,  not market value risk.  Because the
creditworthiness  of an issuer may change more rapidly than is able to be timely
reflected  in changes in credit  ratings,  the Adviser  monitors  the issuers of
corporate  debt  securities  held in the Funds'  portfolio.  The credit  ratings
assigned by a rating  agency to a security are not  considered by the Adviser in
selecting a security.  The Adviser examines the intrinsic value of a security in
light of market conditions and the underlying fundamental values. Because of the
nature of medium and lower rated corporate debt  securities,  achievement by the
Funds  of  their  respective   investment  objectives  when  investing  in  such
securities is dependent on the credit analysis of the Adviser. The Adviser could
be wrong in its analysis.  If the Funds  purchased  primarily  higher rated debt
securities, risks would be substantially reduced.

A general  economic  downturn or a significant  increase in interest rates could
severely disrupt the market for medium and lower grade corporate debt securities
and adversely affect the market value of such securities. The ability of issuers
of medium and lower grade  corporate debt  securities to repay  principal and to
pay  interest,  to  meet  projected  business  goals  and to  obtain  additional
financing may be adversely  affected by economic  conditions.  Such consequences
could  lead to an  increased  incidence  of  default  for  such  securities  and
adversely  affect  the  value  of the  corporate  debt  securities  in a  Fund's
portfolio.  The secondary market prices of medium and lower grade corporate debt
securities  are  more  sensitive  to  adverse  economic  changes  or  individual
corporate developments than are higher rated debt securities.  Adverse publicity
and investor perceptions, whether or not based on rational analysis, and periods
of economic  uncertainty  may also affect the value and  liquidity of medium and
lower grade  corporate  debt  securities,  although  such  factors  also present
investment opportunities when prices fall below intrinsic values. Yields on debt
securities in the portfolio  that are interest rate sensitive can be expected to
fluctuate over time.

<PAGE>

To the extent that there is no established  market for some of the medium or low
grade corporate debt securities in which the Funds may invest, there may be thin
or no  trading  in such  securities  and the  ability  of the  Adviser  to value
accurately such securities may be adversely  affected.  Further,  it may be more
difficult for a Fund to sell  securities for which no established  retail market
exists as compared with  securities  for which such a market does exist.  During
periods of reduced  market  liquidity  and in the  absence of readily  available
market quotations for medium and lower grade corporate debt securities held in a
Fund's  portfolio,  the  responsibility  of the  Adviser  to value  that  Fund's
securities  becomes more difficult and the Adviser's judgment may play a greater
role in the valuation of the Fund's securities due to a reduced  availability of
reliable objective data.

To the extent that a Fund purchases illiquid  securities or securities which are
restricted  as to  resale,  that Fund may  incur  additional  risks  and  costs.
Illiquid and restricted  securities may be  particularly  difficult to value and
their  disposition  may  require  greater  effort and  expense  than more liquid
securities.  A Fund may be  required  to  incur  costs  in  connection  with the
registration  of restricted  securities in order to dispose of such  securities,
although  pursuant  to Rule  144A  under  the  Securities  Act of  1933  certain
securities may be determined to be liquid pursuant to procedures  adopted by the
Board  of  Trustees  under  applicable  guidelines.  The  Funds  may  invest  in
securities of distressed  issuers when the intrinsic  values of such securities,
in the opinion of the Adviser, warrant such investment.

OTHER DEBT  SECURITIES  The Funds may invest in  zero-coupon,  step-coupon,  and
pay-in-kind  securities.  These  securities are debt securities that do not make
regular interest payments.  Zero-coupon and step-coupon securities are sold at a
deep discount to their face value;  pay-in-kind  securities pay interest through
the issuance of additional securities. The market value of these debt securities
generally  fluctuates  in  response  to changes in  interest  rates to a greater
degree than  interest-paying  securities  of  comparable  term and quality.  The
secondary  market value of corporate debt  securities  structured as zero coupon
securities  or  payment-in-kind  securities  may be more volatile in response to
changes in interest rates than debt securities  which pay interest  periodically
in cash. Because such securities do not pay current interest, but rather, income
is  accrued,  to the  extent  that a Fund does not have  available  cash to meet
distribution  requirements  with respect to such income, it could be required to
dispose of portfolio  securities that it otherwise  would not. Such  disposition
could be at a disadvantageous price. Investment in such securities also involves
certain tax considerations.

BARON GROWTH FUND, BARON SMALL CAP FUND and BARON iOPPORTUNITY FUND from time to
time may also purchase indebtedness and participations therein, both secured and
unsecured,  of debtor companies in  reorganization  or financial  restructuring.
Such indebtedness may be in the form of loans, notes, bonds or debentures.  When
the Funds  purchase  a  participation  interest  they  assume  the  credit  risk
associated with the bank or other  financial  intermediary as well as the credit
risk associated with the issuer of any underlying debt instrument. The Funds may
also purchase trade and other claims against,  and other  unsecured  obligations
of, such debtor  companies,  which  generally  represent money due a supplier of
goods or services to such company.  Some debt securities  purchased by the Funds
may have very long  maturities.  The length of time remaining  until maturity is
one factor the Adviser  considers in purchasing a particular  indebtedness.  The
purchase of indebtedness of a troubled  company always involves a risk as to the
creditworthiness  of the issuer and the  possibility  that the investment may be
lost. The Adviser believes that the difference between perceived risk and actual
risk creates the opportunity for profit which can be realized  through  thorough
analysis.  There are no established markets for some of this indebtedness and it
is less liquid than more heavily traded  securities.  Indebtedness of the debtor
company to a bank are not  securities of the banks issuing or selling them.  The
Funds may  purchase  loans from  national and state  chartered  banks as well as
foreign  ones.  The  Funds  may  invest in  senior  indebtedness  of the  debtor
companies,  although on occasion subordinated indebtedness may also be acquired.
The Funds may also invest in distressed  first  mortgage  obligations  and other
debt secured by real property.  The Funds do not currently  anticipate investing
more than 5% of their respective assets in trade and other claims.

The Funds may enter into  repurchase  agreements  with certain banks or non-bank
dealers. In a repurchase agreement the Fund buys a security at one price, and at
the time of sale,  the seller agrees to  repurchase  that security at a mutually
agreed upon time and price. Repurchase agreements could involve certain risks in
the event of the failure of the seller to repurchase  the  securities as agreed,
which  may  cause a fund to  suffer a loss,  including  loss of  interest  on or
principal of the security,  and costs  associated  with delay and enforcement of
the repurchase  agreement.  Repurchase  agreements  with a duration of more than
seven days are considered illiquid securities.

<PAGE>

As a form of borrowing,  the Funds may engage in reverse  repurchase  agreements
with  certain  banks or non-bank  dealers,  where the Fund sells a security  and
simultaneously  agrees to buy it back later at a mutually  agreed upon price. To
the extent a Fund engages in reverse  repurchase  agreements  it will maintain a
segregated account  consisting of liquid assets or highly marketable  securities
to cover its obligations.  Reverse repurchase  agreements may expose the Fund to
greater fluctuations in the value of its assets.

OPTIONS TRANSACTIONS AND SWAPS
- ------------------------------

BARON ASSET FUND may write  (sell)  covered call options or purchase put options
on equity and/or debt  securities.  BARON GROWTH FUND,  BARON SMALL CAP FUND and
BARON  iOPPORTUNITY  FUND and may write  (sell) put and covered call options and
purchase put and call options on equity  and/or debt  securities.  The Funds may
also enter into  equity swap  transactions.  All calls sold by the Funds must be
"covered"  (i.e.,  a Fund must own the  underlying  securities) or must meet the
asset  segregation   requirements  described  below  as  long  as  the  call  is
outstanding.  Even though a Fund will receive the option premium to help protect
it against  loss, a call sold by a Fund exposes that Fund during the term of the
option to possible loss of  opportunity  to realize  appreciation  in the market
price of the underlying  security or instrument and may require the Fund to hold
a security or instrument which it might otherwise have sold.

A put option gives the purchaser of the option,  upon payment of a premium,  the
right to sell,  and the writer  the  obligation,  when  exercised,  to buy,  the
underlying  security,  at the exercise  price. A call option,  upon payment of a
premium,  gives the  purchaser of the option the right to buy, and the seller if
exercised,  the  obligation  to sell,  the  underlying  security at the exercise
price.  An American style put or call option may be exercised at any time during
a fixed period while a European  style put or call option may be exercised  only
upon expiration or during a fixed period prior thereto, and the Funds may engage
in either style option.  The Funds are authorized to engage in transactions with
respect to exchange-listed options, over-the-counter options ("OTC options") and
other derivative investments.  Exchange-listed options are issued by a regulated
intermediary such as the Options Clearing Corporation ("OCC"),  which guarantees
the  performance  of the  obligations  of  the  parties  to  such  options.  The
discussion  below uses the OCC as an example,  but is also  applicable  to other
financial intermediaries.

Rather than taking or making  delivery of the  underlying  security  through the
process of exercising the option,  listed options are usually closed by entering
into offsetting purchase or sale transactions that do not result in ownership of
the new option.  The Fund's  ability to close out its position as a purchaser or
seller of an OCC or  exchange-listed  put or call option is dependent,  in part,
upon the  liquidity of the option  market.  Among the  possible  reasons for the
absence of a liquid option market on an exchange are: (i)  insufficient  trading
interest in certain  options;  (ii)  restrictions on transactions  imposed by an
exchange;  (iii) trading halts,  suspensions or other restrictions  imposed with
respect to  particular  classes or series of  options or  underlying  securities
including  reaching  daily  price  limits;   (iv)  interruption  of  the  normal
operations of the OCC or an exchange;  (v)  inadequacy  of the  facilities of an
exchange or OCC to handle current trading  volume;  or (vi) a decision by one or
more exchanges to discontinue  the trading of options (or a particular  class or
series of options),  in which event the relevant  market for that option on that
exchange  would cease to exist,  although  outstanding  options on that exchange
would generally  continue to be exercisable in accordance with their terms.  The
hours of trading for listed options may not coincide with the hours during which
the  underlying  instruments  are traded.  To the extent that the option markets
close before the markets for the underlying  instruments,  significant price and
rate movements can take place in the underlying markets that cannot be reflected
in the option markets.

OTC  options  are  purchased  from  or  sold to  securities  dealers,  financial
institutions  or  other  parties  ("Counterparties")  through  direct  bilateral
agreement with the Counterparty.  In contrast to exchange-listed  options, which
generally have standardized terms and performance mechanics, all the terms of an
OTC option are  negotiated by the parties.  The Funds expect  generally to enter
into OTC options that have cash  settlement  provisions,  although  they are not
required to do so.

<PAGE>

Equity swap transactions are entered into with financial  institutions through a
direct agreement with the Counterparty,  generally an ISDA Master Agreement, the
specific terms of which are negotiated by the parties.  The Funds may use equity
swaps, or other derivative  instruments,  for hedging purposes against potential
adverse movements in security prices or for non-hedging purposes such as seeking
to  enhance  return.  The  Funds may be  required  to post  collateral  for such
transactions.

Unless the  parties  provide  for it,  there is no central  clearing or guaranty
function in an OTC option or derivatives,  including swaps. As a result,  if the
Counterparty fails to make or take delivery of the security, or other instrument
or fails to make a cash settlement payment due in according with the option, the
Fund will lose any  premium  it paid for the  option as well as any  anticipated
benefit of the transaction. The Adviser must assess the creditworthiness of each
Counterparty to determine the likelihood that the terms of the OTC option or the
derivative will be satisfied.  The Funds will engage in OTC option  transactions
and derivatives only with previously approved  Counterparties.  The staff of the
SEC  currently  takes the position  that OTC options  purchased  by a fund,  and
portfolio securities  "covering" the amount of the fund's obligation pursuant to
an OTC  option  sold by it (the  cost of the  sell-back  plus  the  in-the-money
amount,  if any,) are  illiquid,  and are  subject  to a fund's  limitations  on
investments in illiquid securities.

USE OF SEGREGATED  AND OTHER  SPECIAL ACCOUNTS
- ----------------------------------------------

Many hedging  transactions,  in addition to other  requirements,  require that a
Fund  segregate  liquid high grade assets with its  custodian to the extent Fund
obligations  are not otherwise  "covered"  through  ownership of the  underlying
security or instrument.  In general, either the full amount of any obligation by
the Fund to pay or deliver  securities or assets must be covered at all times by
the  securitiesor  instruments  required  to be  delivered,  or,  subject to any
regulatory  restrictions,  an amount of cash or liquid high grade  securities at
least equal to the current amount of the obligation  must be segregated with the
custodian. The segregated assets cannot be sold or transferred unless equivalent
assets are substituted in their place or it is no longer  necessary to segregate
them.  For  example,  a call option  written by a Fund will require that Fund to
hold the  securities  subject to the call (or  securities  convertible  into the
needed securities without additional  consideration) or to segregate liquid high
grade  securities  sufficient to purchase and deliver the securities if the call
is exercised. A put option written requires that the Fund segregate liquid, high
grade assets equal to the exercise price. Hedging transactions may be covered by
other means when consistent with applicable regulatory policies.

INVESTMENT RESTRICTIONS
- -----------------------
The Funds have  adopted  investment  restrictions,  described  below,  which are
fundamental policies of the Funds and may not be changed without the approval of
the Funds' shareholders. Unless otherwise noted, all percentage restrictions are
measured  as  of  the  time  of  the  investment  after  giving  effect  to  the
transaction.

BARON ASSET FUND may not:

1.   Issue senior securities  except in connection with any permitted  borrowing
     where the Fund is deemed to have issued a senior security;
2.   Borrow  money  except  from banks for  temporary  purposes in an amount not
     exceeding 5% of the Fund's net assets at the time the borrowing is made;
3.   Purchase  securities on margin except for short-term  credit  necessary for
     the clearance of portfolio transactions;
4.   Make short sales of  securities,  maintain a short  position,  or write put
     options;
5.   Purchase or sell commodities or commodity contracts;
6.   Purchase or sell real estate or real estate mortgage loans or invest in the
     securities of real estate  companies  unless such  securities  are publicly
     traded;
7.   Invest in oil, gas or mineral-related programs or leases;
8.   Invest more than 25% of the value of its total assets in any one  industry,
     except investments in U.S. government securities;
9.   Purchase the securities of any one issuer other than the U.S. government or
     any of  its  agencies  or  instrumentalities,  if  immediately  after  such
     purchase  more than 5% of the value of the  Fund's  total  assets  would be
     invested  in such  issuer  or the  Fund  would  own  more  than  10% of the
     outstanding voting securities of such issuer,  except that up to 25% of the
     value of the Fund's total assets may be invested  without  regard to the 5%
     and 10% limitations;
10.  Invest more than 10% of the value of the Fund's total assets in  securities
     which are  restricted or illiquid or in repurchase  agreements  maturing or
     terminable in more than seven days;

<PAGE>

11.  Invest in  securities  of other open end  investment  companies  (except in
     connection with a merger,  consolidation or other reorganization and except
     for the purchase of shares of registered open-end money market mutual funds
     if double advisory fees are not assessed), invest more than 5% of the value
     of the Fund's total assets in more than 3% of the total outstanding  voting
     securities of another  investment  company or more than 10% of the value of
     the Fund's total assets in securities issued by other investment companies;
12.  Participate  on a joint,  or a joint and several,  basis in any  securities
     trading account;
13.  Underwrite securities of other issuers;
14.  Make  loans to other  persons,  except up to 10% of the value of the Fund's
     total assets in loans of portfolio securities and except to the extent that
     the  purchase  of  publicly  traded  debt  securities  and the  entry  into
     repurchase  agreements in accordance with the Fund's  investment  objective
     and policies may be deemed to be loans;
15.  Mortgage,  pledge or hypothecate any portfolio  securities owned or held by
     the  Fund,  except  as  may  be  necessary  in  connection  with  permitted
     borrowing;
16.  Invest more than 5% of its total  assets in  warrants  to  purchase  common
     stock;
17.  Purchase  securities  of any issuer with a record of less than three years'
     continuous operation, including predecessors,  except obligations issued or
     guaranteed by the U.S. Government or its agencies or instrumentalities,  if
     such purchase  would cause the  investments of the Fund in all such issuers
     to exceed 5% of the value of the total assets of the Fund; or
18.  Purchase  or retain  any  securities  of an issuer  any of whose  officers,
     directors,  trustees  or  security  holders is an officer or Trustee of the
     Fund,  or is a member,  officer or  Director of the  Adviser,  if after the
     purchase of the  securities  of such issuer by the Fund one or more of such
     persons owns beneficially  more than of 1% of the shares or securities,  or
     both,  all taken at market value,  of such issuer,  and such persons owning
     more than of 1% of such shares or securities together own beneficially more
     than 5% of such shares or securities, or both, all taken at market value.

BARON GROWTH FUND, BARON SMALL CAP FUND and BARON iOPPORTUNITY FUND may not:

1.   Issue senior  securities  or borrow money or utilize  leverage in excess of
     25% of its net assets (plus 5% for emergency or other short-term  purposes)
     from banks from time to time.
2.   Except as  described  in the  prospectus  or SAI,  engage  in  short-sales,
     purchase securities on margin or maintain a net short position.
3.   Purchase or sell  commodities  or  commodity  contracts  except for hedging
     purposes and in conformity  with  regulations  of the  Commodities  Futures
     Trading  Commission  such that the Fund would not be considered a commodity
     pool.
4.   Purchase  or sell oil and gas  interests  or real  estate.  Debt or  equity
     securities  issued by  companies  engaged  in the oil,  gas or real  estate
     business  are  not  considered  oil or gas  interests  or real  estate  for
     purposes  of this  restriction.  First  mortgage  loans  and  other  direct
     obligations  secured by real  estate  are not  considered  real  estate for
     purposes of this restriction.
5.   Invest more than 25% of the value of its total assets in any one  industry,
     except investments in U.S. government securities.
6.   Purchase the securities of any one issuer other than the U.S. government or
     any of  its  agencies  or  instrumentalities,  if  immediately  after  such
     purchase  more than 5% of the value of the  Fund's  total  assets  would be
     invested  in such  issuer  or the  Fund  would  own  more  than  10% of the
     outstanding voting securities of such issuer,  except that up to 25% of the
     value of the Fund's total assets may be invested  without  regard to the 5%
     and 10% limitations.
7.   Underwrite securities of other issuers.
8.   Make loans,  except to the extent the purchase of debt  obligations  of any
     type (including  repurchase  agreements and corporate commercial paper) are
     considered loans and except that the Fund may lend portfolio  securities to
     qualified   institutional   investors  in  compliance   with   requirements
     established from time to time by the Securities and Exchange Commission and
     the securities exchanges where such securities are traded.
9.   Participate  on a joint,  or a joint and several,  basis in any  securities
     trading account.
10.  Mortgage,  pledge  or  hypothecate  any of  its  assets,  except  as may be
     necessary in connection  with options,  loans of portfolio  securities,  or
     other permitted borrowings.
11.  Purchase  securities  of any issuer with a record of less than three years'
     continuous operations, including predecessors, except obligations issued or
     guaranteed by the U.S. government or its agencies or instrumentalities,  if
     such purchase  would cause the  investments of the Fund in all such issuers
     to exceed 5% of the value of the total assets of the Fund.
12.  Invest more than 15% of its assets in  restricted  or illiquid  securities,
     including repurchase agreements maturing in more than seven days.

<PAGE>

As a non-fundamental  policy,  BARON GROWTH FUND, BARON SMALL CAP FUND and BARON
iOPPORTUNITY FUND will not:

1.   Invest in securities of other registered  investment  companies  (except in
     connection with a merger,  consolidation or other reorganization and except
     for the  purchase of shares of  registered  open-end  money market funds if
     double advisory fees are not assessed), invest more than 5% of the value of
     the Fund's  total  assets in more than 3% of the total  outstanding  voting
     securities of another  investment  company or more than 10% of the value of
     the Fund's total assets in securities issued by other investment companies.
2.   Invest more than 5% of its total  assets in  warrants  to  purchase  common
     stock.
3.   Purchase the  securities  of any issuer of which any officer or director of
     the  Fund  owns 1/2 of 1% of the  outstanding  securities  or in which  the
     officers and directors in the aggregate own more than 5%.

The Securities  and Exchange  Commission  currently  requires that the following
conditions be met whenever  portfolio  securities are loaned:  (1) the Fund must
receive at least 100% cash collateral  from the borrower;  (2) the borrower must
increase such collateral whenever the market value of the securities rises above
the level of such collateral; (3) the Fund must be able to terminate the loan at
any time; (4) the Fund must receive reasonable  interest on the loan, as well as
any dividends, interest or other distributions on the loaned securities, and any
increase in market value; (5) the Fund may pay only reasonable custodian fees in
connection  with the loan; and (6) while voting rights on the loaned  securities
may pass to the borrower, the Fund's trustees must terminate the loan and regain
the right to vote the  securities if a material  event  adversely  affecting the
investment occurs. These conditions may be subject to future modifications.  The
portfolios of the Funds are valued every day the New York Stock Exchange is open
for trading.

With respect to investments in warrants,  the Funds will not invest in excess of
2% of the value of the  particular  Fund's net assets in  warrants  that are not
listed on the New York or American  Stock  Exchanges.  Warrants are  essentially
options to purchase equity  securities at a specified price valid for a specific
period of time.  Their prices do not necessarily  move parallel to the prices of
the underlying securities.  Warrants have no voting rights, receive no dividends
and have no rights with respect to the assets of the issuer.

TURNOVER RATE
- --------------

The adviser  expects that the average annual  turnover rate of the portfolios of
Baron Asset Fund and Baron  Growth Fund should not exceed 50% and of Baron Small
Cap Fund and Baron  iOpportunity  Fund should not exceed 100%. The turnover rate
fluctuates depending on market conditions.  The turnover rates for the Funds for
the past two years are:

    FUND                       1999         1998
    ----                       ----         ----
    BARON ASSET FUND            x %          23%
    BARON GROWTH FUND           x %          40%
    BARON SMALL CAP             x %          59%


MANAGEMENT OF THE FUNDS
- -----------------------

BOARD OF TRUSTEES AND OFFICERS
- ------------------------------

The Board of Trustees  oversees the  management  of the Funds.  The Trustees and
executive officers of the Funds and their principal  occupations during the last
five years are set forth below.

<TABLE>
<CAPTION>
                                POSITION HELD                     PRINCIPAL OCCUPATION(S)
NAME AND ADDRESS         AGE    WITH THE FUND                     DURING PAST FIVE YEARS
<S>                      <C>    <C>                               <C>
- --------------------     ---    -------------                     ---------------------------------------------
Ronald Baron *+           56    Chairman, CEO, Chief              Chairman, CEO, and Director of: Baron
767 Fifth Avenue                Investment Officer and Trustee    Capital, Inc. (1982-Present), Baron Capital
New York, NY 10153                                                Management, Inc. (1983-Present), Baron
                                                                  Capital Group, Inc. (1984-Present),
                                                                  BAMCO, Inc. (1987-Present).

Norman S. Edelcup^        64    Trustee                           Senior Vice President, Item Processing of
244 Atlantic Isle                                                 America (1999-Present) (a subsidiary of The
North Miami, FL 33160                                             Intercept Group); Chairman, Item
                                                                  Processing of America (1989-1999) (a
                                                                  financial institution service bureau);
                                                                  Director, Valhi, Inc. (1975-Present)
                                                                  (diversified company); Director, Artistic
                                                                  Greetings, Inc. (1985-1998).

</TABLE>
<PAGE>

<TABLE>
<CAPTION>
                                POSITION HELD                     PRINCIPAL OCCUPATION(S)
NAME AND ADDRESS         AGE    WITH THE FUND                     DURING PAST FIVE YEARS
<S>                      <C>    <C>                               <C>
- --------------------     ---    -------------                     ---------------------------------------------
Mark M. Feldman           48    Trustee                           President and CEO, Cold Spring Group, Inc.
444 Madison Ave., Ste 703                                         (1993-Present) (reorganization and
New York, NY 10020                                                restructuring consulting); Chief
                                                                  Restructuring Officer, various companies
                                                                  (1995-Present) (case and litigation
                                                                  management); Director, SNL Securities, Inc.
                                                                  (1997-Present) (publisher of data bases and
                                                                  manager of a bank and thrift portfolio);
                                                                  Trustee, Aerospace Creditors Liquidating
                                                                  Trust (1993-1997) (administered and liquidated assets).

Irwin Greenberg^          68    Trustee                           Chairman (1994-1997) and Director (1991-
4303 W.  Wyndemere Circle                                         Present), Lehigh Valley Hospital Board;
Schnecksville, PA 18078                                           Retail Consultant, (1990-Present); Director,
                                                                  Cedar Crest College (1990-1999); Director,
                                                                  Henry Lehr & Co., Inc. (1996-Present)
                                                                  (insurance); President and CEO, Hess's
                                                                  Department Stores (1976-1990).

Clifford Greenberg        40    Vice President                    Vice President of:  Baron Capital, Inc.,
767 Fifth Avenue                                                  Baron Capital Group, Inc., BAMCO, Inc.,
New York, NY 10153                                                (1997-Present); Genera Partner, HPB
                                                                  Associates, LP (1984-1996) (investment partnership).

Linda S. Martinson*+      45    Vice President, Secretary and     General Counsel and Secretary of:  Baron
767 Fifth Avenue                Trustee                           Capital, Inc. (1983-Present), BAMCO, Inc.
New York, NY 10153                                                (1987-Present), Baron Capital Group, Inc.
                                                                  (1984-Present), Baron Capital Management,
                                                                  Inc. (1983-Present).

Charles N. Mathewson      71    Trustee                           Chairman, International Game Technology
9295 Prototype Road                                               (1986-Present) (manufacturer of
Reno, NV 89511                                                    microprocessor-controlled gaming machines
                                                                  and monitoring systems).

Harold W. Milner          65    Trustee                           Retired; President and CEO, Kahler Realty
2293 Morningstar Drive                                            Corporation (1985-1997) (hotel ownership
Park City, UT 84060                                               and management).

Raymond Noveck+           55    Trustee                           Private Investor (1999-Present); President,
31 Karen Road                                                     The Medical Information Line, Inc. (1997-
Waban, MA 02168                                                   1998) (health care information); President,
                                                                  Strategic Systems, Inc. (1990-1997) (health
                                                                  care information); Director, Horizon/CMS
                                                                  Healthcare Corporation (1987-1997).

Susan Robbins             45    Vice President                    Senior Analyst, Vice President and Director
767 Fifth Avenue                                                  of:  Baron Capital, Inc. (1982-Present),
New York, NY 10153                                                Baron Capital Management, Inc. (1984-
                                                                  Present).

Morty Schaja*             45    Senior Vice President, Chief      Senior Vice President and Chief Operating
767 Fifth Avenue                Operating Officer and Trustee     Officer of Baron Capital, Inc. (1997-
New York, NY 10153                                                Present), Managing Director, Vice
                                                                  President, Baron Capital, Inc. (1991-
                                                                  Present), and Director, Baron Capital Group,
                                                                  Inc., Baron Capital Management, Inc., and
                                                                  BAMCO, Inc. (1997-Present).

David A. Silverman, MD    49    Trustee                           Physician and Faculty, New York
239 Central Park West                                             University School of Medicine (1976-
New York, NY 10024                                                Present).

Peggy C. Wong             39    Treasurer and Chief Financial     Treasurer and Chief Financial Officer of:
767 Fifth Avenue                Officer                           Baron Capital, Inc., Baron Capital Group,
New York, NY 10153                                                Inc., BAMCO, Inc. and Baron Capital
                                                                  Management, Inc. (1987-Present).
</TABLE>
________________________________________________________________________________

*    Trustees  deemed  to be  "interested  persons"  of the Fund as that term is
     defined in the Investment Company Act of 1940.
+    Members of the Executive  Committee,  which is empowered to exercise all of
     the powers,  including the power to declare dividends, of the full Board of
     Trustees when the full Board of Trustees is not in session.
^    Members of the Audit Committee.

<PAGE>

The Trustees of the Funds'  received the following  compensation  from the Funds
for the fiscal year ended September 30, 1999:

                   AGGREGATE COMPENSATION        TOTAL COMPENSATION
NAME               FROM THE FUNDS                FROM THE FUNDS PAID TO TRUSTEES
- ----               ----------------------        -------------------------------

Ronald Baron             $0                       $0
Norman Edelcup           $15,000                  $15,000
Linda S. Martinson       $0                       $0
Charles Mathewson        $ 2,500                  $ 2,500
Mark Feldman             $12,500                  $12,500
Irwin Greenberg          $15,000                  $15,000
Harold Milner            $12,500                  $12,500
Raymond Noveck           $12,500                  $12,500
Morty Schaja             $0                       $0
David Silverman          $12,500                  $12,500
Daniel Tisch             $143                     $143

TOTALS                   $82,643                  $82,643


PRINCIPAL HOLDERS OF SHARES
- ---------------------------

As of December 31, 1999, the following persons were known to the Funds to be the
record or beneficial owners of more than 5% of the outstanding securities of the
Funds:

                                       BARON ASSET   BARON GROWTH   BARON SMALL
                                       FUND          FUND           CAP FUND
                                       -----------   ------------   -----------

CHARLES SCHWAB & CO., INC.              %             %              %
NATIONAL FINANCIAL SERVICES CORP.       %             %              %
DONALDSON, LUFKIN & JENRETTE            %             %              %

All  of  the  above  record  owners  are  brokerage  firms  or  other  Financial
Institutions that hold stock for the benefit of their respective  customers.  As
of December 31, 1999,  all of the officers and Trustees of Baron Asset Fund as a
group  beneficially  owned  directly or  indirectly  0.xx% of Baron Asset Fund's
outstanding  shares 0.xx% of Baron Growth Fund's outstanding shares and 0.xx% of
Baron Small Cap Fund's outstanding shares.

INVESTMENT ADVISER
- ------------------

The investment  adviser to the Funds is BAMCO, Inc. (the "Adviser"),  a New York
corporation with its principal offices at 767 Fifth Avenue, New York, N.Y. 10153
and a subsidiary of Baron Capital Group, Inc.  ("BCG").  Mr. Ronald Baron is the
controlling  stockholder  of BCG and is BAMCO's chief  investment  officer.  Mr.
Baron has over 30 years of experience  as a Wall Street  analyst and has managed
money  for  others  for over 25 years.  He has been a  participant  in  Barron's
Roundtable  and has been a featured guest on Wall Street Week, CNN and CNBC/FNN.
Pursuant  to  separate  Advisory   Agreements  with  each  Fund  (the  "Advisory
Agreement"),  the Adviser furnishes continuous  investment advisory services and
management to each Fund,  including making the day-to-day  investment  decisions
and arranging  portfolio  transactions for the Funds subject to such policies as
the Trustees  may  determine.  Baron Asset Fund  incurred  advisory  expenses of
$59,460,701  for the year ended  September  30, 1999;  $45,074,474  for the year
ended September 30, 1998; and $18,573,064 for the year ended September 30, 1997.
Baron Growth Fund incurred  advisory  expenses of $3,534,481  for the year ended
September  30, 1999;  $4,310,057  for the year ended  September  30,  1998;  and
$2,828,391 for the year ended September 30, 1997.  Baron Small Cap Fund incurred
advisory  expenses of  $5,457,810  for the year ended  September  30, 1999;  and
$4,041,420  for the year ended  September 30, 1998, its first year of operation.
Baron iOpportunity Fund did not incur any advisory fees in 1999.

<PAGE>

Under the  Advisory  Agreements,  the  Adviser,  at its own  expense and without
reimbursement  from the Funds,  furnishes  office space and all necessary office
facilities,  equipment and executive  personnel for managing the Funds, and pays
the salaries and fees of all officers and Trustees who are interested persons of
the Adviser.

The Funds pay all operating and other  expenses not borne by the Adviser such as
audit,  accounting and legal fees;  custodian fees;  expenses of registering and
qualifying its shares with federal and state securities commissions; expenses in
preparing  shareholder  reports  and  proxy  solicitation  materials;   expenses
associated with each Fund's shares such as dividend  disbursing,  transfer agent
and registrar fees; certain insurance expenses; compensation of Trustees who are
not  interested  persons  of  the  Adviser;  and  other  miscellaneous  business
expenses.  The  Funds  also pay the  expenses  of  offering  the  shares of each
respective  Fund,   including  the  registration  and  filing  fees,  legal  and
accounting fees and costs of printing the prospectus and related documents. Each
Fund  also  pays all  taxes  imposed  on it and all  brokerage  commissions  and
expenses incurred in connection with its portfolio transactions.

The  Adviser  utilizes  the  staffs  of BCG and  its  subsidiary  Baron  Capital
Management, Inc. ("BCM") to provide research.  Directors,  officers or employees
of the Adviser  and/or its  affiliates may also serve as officers or Trustees of
the  Funds.  BCM  is an  investment  adviser  to  institutional  and  individual
accounts. Clients of BCM have investment objectives which may vary only slightly
from those of each other and of the Funds.  BCM invests  assets in such clients'
accounts  and in the  accounts  of  principals  and  employees  of BCM  and  its
affiliates in investments  substantially similar to, or the same as, those which
constitute the principal  investments of the Funds. When the same securities are
purchased for or sold by a Fund and any of such other accounts, it is the policy
of the  Adviser  and  BCM to  allocate  such  transactions  in a  manner  deemed
equitable by the Adviser,  and for the  principals and employees of the Adviser,
BCM, and affiliates to take either the same or least favorable price of the day.
All trading by  employees  is subject to the Code of Ethics of the Funds and the
Adviser. In certain circumstances the Adviser may make investments for the Funds
that  conflict  with  investments  being made by BCM.  The Adviser may also make
investment  decisions  for a Fund  that are  inconsistent  with  the  investment
decisions for another Fund.

Each  Advisory  Agreement  provides that the Fund may use "Baron" as part of its
name for so long as the Adviser serves as investment  adviser to that Fund. Each
Fund  acknowledges that the word "Baron" in its name is derived from the name of
the entities  controlling,  directly and indirectly,  the Adviser,  which derive
their name from Ronald Baron;  that such name is the property of the Adviser and
its affiliated  companies for copyright  and/or other purposes;  and that if for
any reason the Adviser ceases to be that Fund's  investment  adviser,  that Fund
will promptly  take all steps  necessary to change its name to one that does not
include "Baron," absent the Adviser's written consent.

Each  Advisory  Agreement  provides  that the Adviser shall have no liability to
that Fund or its shareholders for any error of judgment or mistake of law or for
any loss  suffered  by that  Fund;  provided,  that  the  Adviser  shall  not be
protected  against  liabilities  arising by virtue of willful  misfeasance,  bad
faith or gross negligence,  or reckless  disregard of the Adviser's  obligations
under the Advisory Agreement.

<PAGE>

The Advisory Agreements were approved by a majority of the Trustees, including a
majority of the  Trustees who are not  "interested  persons" ( as defined by the
Investment  Company  Act of 1940  ("1940 Act" )) for Baron Asset Fund on May 11,
1987, for Baron Growth Fund on October 21, 1994, and for Baron Small Cap Fund on
July 29, The  Advisory  Agreements  must  normally be  approved  annually by the
Trustees or a majority of the particular  Fund's shares and by a majority of the
Trustees who are not parties to the Advisory  Agreement or interested persons of
any such party.  With  respect to Baron Asset Fund,  Baron Growth Fund and Baron
Small Cap Fund, such approval for 1999 was given at a Board of Trustees  meeting
held on April 26, 1999. The Advisory  Agreement for Baron  iOpportunity Fund was
approved  by the Board of Trustees  on xxxxxx,  1999 for an initial  term of two
years.

Each Advisory  Agreement is terminable  without penalty by either the Fund (when
authorized by majority vote of either its outstanding shares or the Trustees) or
the  Adviser  on  60  days'  written  notice.   Each  Advisory  Agreement  shall
automatically terminate in the event of its "assignment" (as defined by the 1940
Act).

SERVICE AGREEMENTS
- ------------------

The Funds have  agreements  with  various  service  providers  pursuant to which
administrative  services  such  as  record  keeping,  reporting  and  processing
services are provided to the Funds.

DISTRIBUTOR
- -----------

The Funds have a  distribution  agreement  with  Baron  Capital,  Inc.,  ("Baron
Capital" or the  "Distributor")  a New York corporation and a subsidiary of BCG,
located at 767 Fifth Avenue,  New York, N.Y. 10153.  Baron Capital is affiliated
with the  Adviser.  The  Distributor  acts as the  agent  for the  Funds for the
continuous public offering of their shares on a best efforts basis pursuant to a
distribution  plan  adopted  under Rule 12b-1 under the 1940 Act  ("Distribution
Plan").

DISTRIBUTION PLAN
- -----------------

The Distribution Plan authorizes the Funds to pay the Distributor a distribution
fee equal on an annual  basis to 0.25% of the Funds'  average  daily net assets.
The fee was reduced to 0.25% from 0.50% on July 12, 1993. The  distribution  fee
is paid to the  Distributor  in  connection  with  its  activities  or  expenses
primarily intended to result in the sale of shares,  including,  but not limited
to,  compensation  to  registered  representatives  or  other  employees  of the
Distributor;  compensation  to and expenses of employees of the  Distributor who
engage in or  support  the  distribution  of shares or who  service  shareholder
accounts; telephone expenses;  preparing,  printing and distributing promotional
and advertising  material;  preparing,  printing and distributing the Prospectus
and  reports  to other  than  current  shareholders;  compensation  for  certain
shareholder services;  and commissions and other fees to broker-dealers or other
persons  (excluding  banks)  who have  introduced  investors  to the  Fund.  The
distribution fee is payable to the Distributor regardless of the actual expenses
incurred,  although  the  actual  expenses  incurred  by  the  Distributor  have
historically exceeded the distribution fees received by the Distributor.

If and to the extent the expenses  listed below are  considered  to be primarily
intended to result in the sale of shares within the meaning of Rule 12b-1,  they
are not included in the limits above:  (a) the costs of  preparing,  printing or
reproducing and mailing all required  reports and notices to  shareholders;  (b)
the costs of preparing, printing or reproducing and mailing all proxy statements
and proxies (whether or not such proxy materials include any item relating to or
directed  toward the sale of shares);  (c) the costs of  preparing,  printing or
reproducing   and  mailing  all   prospectuses   and  statements  of  additional
information;  (d) all legal and accounting  fees relating to the  preparation of
any such  report,  prospectus,  and proxy  materials;  (e) all fees and expenses
relating  to the  qualification  of the  Funds  and/or  their  shares  under the
securities or "Blue Sky" laws of any  jurisdiction;  (f) all fees under the 1940
Act and the  Securities  Act of  1933,  including  fees in  connection  with any
application for exemption relating to or directed toward the sale of Shares; (g)
all fees and  assessments,  if any, of the Investment  Company  Institute or any
successor  organization,  whether or not its  activities are designed to provide
sales assistance; (h) all costs of preparing and mailing confirmations of shares
sold or redeemed and reports of share  balances;  (i) all costs of responding to
telephone or mail inquiries of shareholders or prospective shareholders.

<PAGE>

The Distribution Plan requires that while it is in effect the Distributor report
in writing, at least quarterly, the amounts of all expenditures, the identity of
the  payees  and the  purposes  for which  such  expenditures  were made for the
preceding fiscal quarter.

For the fiscal year ended September 30, 1999, Baron Asset Fund paid distribution
fees to the Distributor of $14,865,186  (an additional  $231,170 was absorbed by
the  Distributor  and/or its affiliates and not paid by the Fund pursuant to the
0.25%  limitation);  Baron Growth Fund paid distribution fees to the Distributor
of $883,621 (an  additional  $1,308 was absorbed by the  Distributor  and/or its
affiliates and not paid by the Fund pursuant to the 0.25% limitation); and Baron
Small Cap Fund paid  distribution  fees to the  Distributor  of  $1,364,454  (an
additional $49,300 was absorbed by the Distributor and/or its affiliates and not
paid by the Fund pursuant to the 0.25%  limitation).  The distribution  expenses
incurred by the  Distributor  for the fiscal year ended  September 30, 1999 with
respect to the three Funds in the aggregate were as follows:

     (a)  Advertising                                          $       xxx

     (b)  printing and mailing of prospectuses                        xxxx
          to other than current shareholders

     (c)  Compensation paid or to be paid to                         xxxxxx
          broker/dealers

     (d)  Compensation paid to sales and clerical personnel          xxxxxx

     (e)  Other                                                        xxxx

Trustees of the Funds who were not interested persons of the Funds had no direct
or indirect  financial interest in the operation of the Distribution Plan or the
Distribution Agreement. All the interested Trustees had such an interest.

The  Distribution  Plan has  been  approved  by the  Funds'  Board of  Trustees,
including a majority of the Trustees who are not interested persons of the Funds
and who have no direct or indirect  financial  interest in the  operation of the
Distribution  Plan  or in any  agreements  related  thereto.  In  approving  the
Distribution  Plan, the Trustees  considered various factors and determined that
there is a reasonable  likelihood that the Plan will benefit the Funds and their
shareholders.  The  anticipated  benefits  include  the  following:  (i) reduced
expense  ratios due to economies of scale,  (ii) the ability to purchase  larger
blocks  of  securities,   resulting  in  decreased   expenses,   and  (iii)  the
minimization  of adverse  effects from forced sales of portfolio  securities  to
meet redemptions.

Baron Capital is authorized  to make payments to authorized  dealers,  banks and
other  financial  institutions  who have rendered  distribution  assistance  and
ongoing shareholder support services, shareholder servicing assistance or record
keeping.  Certain  states may require  that any such person be  registered  as a
dealer with such state. The Funds may execute  portfolio  transactions  with and
purchase  securities  issued by depository  institutions  that receive  payments
under the  Distribution  Plan. No  preference  will be shown in the selection of
investments for the instruments of such depository  institutions.  Baron Capital
may also retain part of the  distribution  fee as compensation  for its services
and expenses in connection  with the  distribution  of shares.  Baron  Capital's
actual  expenditures  have  and  will  continue  to  substantially   exceed  the
distribution  fee received by it. If the  Distribution  Plan is terminated,  the
Funds  will owe no  payments  to Baron  Capital  other  than any  portion of the
distribution  fee accrued  through the effective  date of  termination  but then
unpaid.

Unless  terminated in accordance  with its terms,  the  Distribution  Plan shall
continue in effect until,  and from year to year thereafter if, such continuance
is specifically  approved at least annually by its Trustees and by a majority of
the Trustees who are not  interested  persons of the Fund and who have no direct
or indirect  financial  interest in the operation of the Distribution Plan or in
any agreements  related  thereto,  such votes cast in person at a meeting called
for the purpose of such vote.

<PAGE>

The Distribution Plan may be terminated at any time by the vote of a majority of
the members of the Funds'  Board of Trustees who are not  interested  persons of
the Funds and have no direct or indirect  financial interest in the operation of
the Distribution  Plan or in any agreements  related thereto or by the vote of a
majority of the outstanding  shares. The Distribution Plan may not be amended to
increase  materially the amount of payments to be made without the approval of a
majority of the shareholders. All material amendments must be approved by a vote
of the Trustees and of the Trustees who are not interested  persons of the Funds
and have no  direct or  indirect  financial  interest  in the  operation  of the
Distribution  Plan or in any  agreements  related  thereto,  such  votes cast in
person at a meeting called for the purpose of such vote.

The Glass-Steagall  Act and other applicable laws, among other things,  prohibit
banks  from  engaging  in  underwriting,  selling  or  distributing  securities.
Accordingly,  the  Distributor  will  enter into  agreements  with banks only to
provide administrative assistance.  However, changes in federal or state statues
and   regulations   as  well  as  judicial  or   administrative   decisions   or
interpretations could prevent a bank from continuing to perform all or a part of
the  contemplated  services.  If a bank  were  prohibited  from so  acting,  the
Trustees would consider what actions,  if any, would be necessary to continue to
provide efficient and effective  shareholder  services.  It is not expected that
shareholders  would  suffer any adverse  financial  consequences  as a result of
these occurrences.

BROKERAGE
- ---------

The Adviser is responsible for placing the portfolio  brokerage  business of the
Funds with the objective of obtaining the best net results for the Funds, taking
into account  prompt,  efficient and reliable  executions at a favorable  price.
Brokerage transactions for the Funds in exchange-listed  securities are effected
chiefly by or through the Adviser's  affiliate,  Baron Capital,  when consistent
with this objective and subject to the  conditions  and  limitations of the 1940
Act.  Baron  Capital  is a member  of the  National  Association  of  Securities
Dealers,  Inc., but is not a member of any securities exchange.  Transactions in
securities  that trade on NASDAQ or are  otherwise  not listed are  effected  by
broker/dealers  other  than  Baron  Capital.  The Funds do not deal  with  Baron
Capital in any portfolio transaction in which Baron Capital acts as principal.

The Funds'  Board of Trustees has adopted  procedures  pursuant to Rule 17e-1 of
the 1940 Act which are reasonably  designed to provide that the commissions paid
to Baron  Capital are  reasonable  and fair compared to the  commission,  fee or
other  remuneration  received by other  brokers in  connection  with  comparable
transactions   involving  similar  securities  being  purchased  or  sold  on  a
securities  exchange  during a comparable  period of time.  The Board reviews no
less frequently than quarterly that all transactions  effected  pursuant to Rule
17e-1  during the  preceding  quarter  were  effected  in  compliance  with such
procedures.  The Funds and the Adviser  furnish such  reports and maintain  such
records as required by Rule 17e-1.

For the fiscal year ended September 30, 1999, of the total $xxxxxxxxx  brokerage
commissions  paid by the Funds,  $xxxxxxxxx  brokerage  commissions were paid to
Baron  Capital.  For the fiscal year ended  September  30, 1998,  of the total $
8,178,614  brokerage  commissions  paid by the Funds,  $ 5,435,764  were paid to
Baron  Capital.  For the fiscal  year ended  September  30,  1997,  of the total
$3,307,779 brokerage commissions paid by Baron Asset Fund and Baron Growth Fund,
$2,575,700  brokerage  commissions  were paid to Baron  Capital.  The  brokerage
commissions paid to Baron Capital  represent xxx% of the aggregate dollar amount
of  brokerage  commissions  paid  and xxx% of the  aggregate  dollar  amount  of
transactions  involving the payment of commissions for the 1999 fiscal year. The
brokerage  commissions  paid to Baron Capital  represent  66.5% of the aggregate
dollar amount of brokerage  commissions  paid and 59.1% of the aggregate  dollar
amount of transactions  involving the payment of commissions for the 1998 fiscal
year. The brokerage  commissions  paid to Baron Capital  represent  77.9% of the
aggregate dollar amount of brokerage commissions paid and 76.4% of the aggregate
dollar amount of transactions  involving the payment of commissions for the 1997
fiscal year.  Transactions in which Baron Capital acted as broker represents xx%
of the aggregate dollar amount of all principal and agency  transactions for the
Funds for the 1999 fiscal year.

<PAGE>

Under the  Investment  Advisory  Agreements and as permitted by Section 28(e) of
the  Securities and Exchange Act of 1934, the Adviser may cause the Funds to pay
a  broker-dealer  (except Baron Capital)  which provides  brokerage and research
services  to the Adviser an amount of  commission  for  effecting  a  securities
transaction  for the Funds in excess of the amount  other  broker-dealers  would
have charged for the  transaction  if the Adviser  determines in good faith that
the greater  commission is consistent with the Funds' policies and is reasonable
in relation to the value of the brokerage and research  services provided by the
executing  broker-dealer  viewed in terms of either a particular  transaction or
the Adviser's overall responsibilities to the Funds or to its other clients. The
term  "brokerage  and  research  services"  includes  advice  as to the value of
securities, the advisability of investing in, purchasing, or selling securities,
and the  availability  of securities or of purchasers or sellers of  securities;
furnishing  analyses and reports  concerning  issuers,  industries,  securities,
economic factors and trends, portfolio strategy and the performance of accounts;
and  effecting  securities  transactions  and  performing  functions  incidental
thereto such as clearance and  settlement.  Such research and information may be
used by the Adviser or its  affiliates to supplement the services it is required
to perform pursuant to the Advisory  Agreement in serving the Funds and/or other
advisory clients of affiliates.

Broker-dealers may be willing to furnish statistical  research and other factual
information or services to the Adviser for no consideration other than brokerage
or  underwriting  commissions.  Securities  may be bought or sold  through  such
broker-dealers,  but at  present,  unless  otherwise  directed  by the Funds,  a
commission  higher  than one charged  elsewhere  will not be paid to such a firm
solely because it provided research to the Adviser. Research provided by brokers
is used for the benefit of all of the Adviser's or its  affiliates'  clients and
not solely or necessarily for the benefit of the Funds. The Adviser's investment
management  personnel  attempt to evaluate  the quality of research  provided by
brokers.  Results  of  this  effort  are  sometimes  used  by the  Adviser  as a
consideration the in the selection of brokers to execute portfolio transactions.

Baron Capital acts as broker for, in addition to the Funds,  accounts of BCM and
Baron Capital,  including accounts of principals and employees of Baron Capital,
BCM and the Adviser.  Investment decisions for the Funds for investment accounts
managed by BCM and for accounts of Baron  Capital are made  independent  of each
other in light of differing  considerations  for the various  accounts.The  same
investment  decision  may,  however,  be made for two or more of the  Adviser's,
BCM's and/or Baron Capital's accounts. In such event,  simultaneous transactions
are inevitable.  Purchases and sales are averaged as to price where possible and
allocated to account in a manner deemed  equitable by the Adviser in conjunction
with BCM and Baron  Capital.This  procedure could have a detrimental effect upon
the price or value of the  security  for the  Funds,  but may have a  beneficial
effect.

The investment  advisory fee that the Funds pay to the Adviser is not reduced as
a consequence of the Adviser's  receipt of brokerage and research  services.  To
the extent the Funds'  portfolio  transactions are used to obtain such services,
the  brokerage  commissions  paid by the Funds  will  exceed  those  that  might
otherwise  be paid by an  amount  that  cannot  be  presently  determined.  Such
services  would by useful and of value to the Adviser in serving  both the Funds
and other clients and,  conversely,  such services  obtained by the placement of
brokerage  business of other  clients would by useful to the Adviser in carrying
out its obligations to the Funds.


CUSTODIAN,  TRANSFER  AGENT  AND DIVIDEND  AGENT
- ------------------------------------------------

The Bank of New York, 100 Church Street,  New York, NY, is the custodian for the
Funds' cash and  securities.  DST Systems,  Inc.,  CT-7 Tower,  1004  Baltimore,
Kansas City, MO 64105,  is the transfer  agent and dividend agent for the Funds'
shares.  Neither  institution  assists  in  or  is  responsible  for  investment
decisions involving assets of the Funds.

REDEMPTION OF SHARES
- --------------------

The Funds expect to make all redemptions in cash, but have reserved the right to
make payment, in whole or in part, in portfolio securities. Payment will be made
other than all in cash if the Funds' Board of Trustees  determines that economic
conditions  exist  which  would make  payment  wholly in cash  detrimental  to a
particular fund's best interests.  Portfolio securities to be so distributed, if
any,  would be selected in the  discretion  of the Funds'  Board of Trustees and
priced as  described  under  "Determining  Your Share  Price"  herein and in the
Prospectus.

<PAGE>

BARON  iOPPORTUNITY  FUND imposes a  short-term  trading fee on  redemptions  of
shares held for less than 180 days. The fee is 1% of the redemption value and is
deducted from the redemption proceeds.  The Fund uses the "first-in,  first-out"
method to determine  the holding  period,  so if you bought  shares on different
days, the shares purchased first will be redeemed first for determining  whether
the fee  applies.  The fee is  retained  by the  Fund  for  the  benefit  of the
remaining  shareholders  to offset  the  administrative  costs  associated  with
processing  redemptions  and to offset the portfolio  transaction and facilitate
portfolio management.

The Fund waives the fee for defined contribution plans and may waive the fee for
other redemptions if it is in the best interest of the Fund.

NET  ASSET VALUE
- ----------------

As more fully set forth in the Prospectus under  "Determining Your Share Price,"
the net asset value per share of each Fund is  determined as of the close of the
New York Stock  Exchange on each day that the  Exchange is open.  he Exchange is
open all week days that are not holidays,  which it announces annually. The most
recent  announcement states it will not be open on New Year's Day, Martin Luther
King, Jr.'s Day, Washington's Birthday,  Good Friday, Memorial Day, Independence
Day, Labor Day, Thanksgiving and Christmas.

Securities  traded on more than one national  securities  exchange are valued at
the last sale  price of the day as of which such  value is being  determined  as
reflected at the close of the exchange  which is the  principal  market for such
securities.

U.S. Government obligations and other debt instruments having sixty days or less
remaining until maturity are stated at amortized cost. Debt instruments having a
greater  remaining  maturity  will be valued at the  highest  bid price from the
dealer  maintaining  an active market in that security or on the basis of prices
obtained from a pricing service approved by the Board of Trustees.

TAXES
- -----

Each Fund  intends to qualify  every year as a  "regulated  investment  company"
under  Subchapter  M  of  the  Internal  Revenue  Code  of  1986  (the  "Code").
Qualification  as a regulated  investment  company relieves the Funds of Federal
income  taxes on the  portion of their net  investment  income and net  realized
capita  gains  distributed  to  shareholders.  The Funds  intend  to  distribute
virtually all of their net investment  income and net realized  capital gains at
least annually to their respective shareholders.

A  non-deductible  4% excise tax will be imposed on a Fund to the extent that it
does not distribute  (including  declaration of certain dividends),  during each
calendar year, (i) 98% of its ordinary  income for such calendar year,  (ii) 98%
of its capital  gain net income (the excess of short and long term  capital gain
over short and long term capital loss) for each one-year  period ending  October
31  and  (iii)  certain  other  amounts  not   distributed  in  previous  years.
Shareholders  will be taxed during each calendar year on the full amount of such
dividends  distributed  (including  certain declared dividends not actually paid
until the next calendar year).

For Federal income tax purposes,  distributions  paid from net investment income
and from any net realized  short-term  capital gains are taxable to shareholders
as  ordinary  income,   whether  received  in  cash  or  in  additional  shares.
Distributions  paid from net  capital  gains are  taxable as  long-term  capital
gains,  whether  received  in  cash  or  shares  and  regardless  of how  long a
shareholder has held the shares, and are not eligible for the dividends received
deduction.   Distributions  of  investment  income  (but  not  distributions  of
short-term or long-term capital gains) received by shareholders will qualify for
the 70% dividends  received  deduction  available to  corporations to the extent
designated by the Fund in a notice to each  shareholder.  Unless all of a Fund's
gross income constitutes dividends from domestic corporations qualifying for the
dividends  received  deduction,  a portion of the  distributions  of  investment
income to those holders of that Fund which are corporations will not qualify for
the 70%  dividends  received  deduction.  The dividends  received  deduction for
corporate  holders may be further  reduced if the shares  with  respect to which
dividends are received are treated as  debt-financed or deemed to have been held
for less than forty-six (46) days.

<PAGE>

The Funds will send written notices to shareholders regarding the Federal income
tax status of all  distributions  made  during  each  calendar  year as ordinary
income or capital gain and the amount qualifying for the 70% dividends  received
deduction.

The foregoing  relates to Federal  income  taxation.  Distributions  may also be
subject to state and local taxes.  The Funds are  organized  as a  Massachusetts
business trust.  Under current law, so long as the Funds qualify for the Federal
income tax  treatment  described  above,  it is  believed  that they will not be
liable for any income or franchise tax imposed by Massachusetts.

Investors are urged to consult their own tax advisers  regarding the application
of Federal, state and local tax laws.

ORGANIZATION AND CAPITALIZATION
- -------------------------------

GENERAL
- -------

Baron Asset Fund is an open-end  investment  company  organized as a series fund
and  established  under  the  laws of The  Commonwealth  of  Massachusetts  by a
Declaration  of Trust  dated  February  19,1987,  as  amended.  The four  series
currently  available  are Baron Asset Fund,  Baron Growth Fund,  Baron Small Cap
Fund and Baron  iOpportunity  Fund. Shares entitle their holders to one vote per
share.  Shares have  non-cumulative  voting rights,  which means that holders of
more than 50% of the shares  voting for the  election of Trustees  can elect all
Trustees and, in such event,  the holders of the remaining shares voting for the
election  of  Trustees  will not be able to  elect  any  person  or  persons  as
Trustees.   Shares  have  no  preemptive  or   subscription   rights,   and  are
transferable.

SHAREHOLDER AND TRUSTEE LIABILITY
- ---------------------------------

Under  Massachusetts  law,  shareholders of a Massachusetts  business trust may,
under  certain  circumstances,  be held  personally  liable as partners  for the
obligations  of  the  trust.  The  Declaration  of  Trust  contains  an  express
disclaimer of  shareholder  liability for acts or obligations of the Fund or any
series  thereof.  Notice  of such  disclaimer  will  normally  be  given in each
agreement,  obligation  or  instrument  entered into or executed by the Funds or
Trustees.  The Declaration of Trust provides for  indemnification  by a Fund for
any loss  suffered by a  shareholder  as a result of an obligation of that Fund.
The Declaration of Trust also provides that a Fund shall,  upon request,  assume
the defense of any claim made against any  shareholder  for an act or obligation
of that Fund and satisfy any judgment  thereon.  Thus, the risk of a shareholder
incurring  financial  loss on account  or  shareholder  liability  is limited to
circumstances in which the Fund itself would be unable to meets its obligations.
The Trustees believe that, in view of the above, the risk of personal  liability
of shareholders is remote.

The  Declaration of Trust further  provides that the Trustees will not be liable
for  errors  of  judgment  or  mistakes  of  fact  or law,  but  nothing  in the
Declaration  of trust  protects a trustee  against  liability to which he or she
would otherwise be subject by reason of willful  misfeasance,  bad faith,  gross
negligence or reckless disregard of the duties involved in the conduct of his or
her office.

OTHER INFORMATION
- -----------------

INDEPENDENT ACCOUNTANTS
- -----------------------

PricewaterhouseCoopers  LLP,  1177 Avenue of the  Americas,  New York,  New York
10036, has been selected as independent accountants of the Funds.

CALCULATIONS OF PERFORMANCE DATA
- --------------------------------

Advertisements  and other  sales  literature  for the Funds may refer to average
annual total return and actual  return.  Average annual total return is computed
by finding the average  annual  compounded  rates of return over a given  period
that would equate a  hypothetical  initial  investment to the ending  redeemable
value thereof, as follows:
<PAGE>

                                P(1+T)^ = ERV
Where:         P  = a hypothetical initial payment of $1,000
               T  = average annual total return
              ^   = number of years
              ERV = ending redeemable value at the end of the period of a
                    hypothetical $1,000 investment made at the beginning
                    of the period

Actual return is computed by measuring  the  percentage  change  between the net
asset value of a hypothetical  $1,000 investment in the Fund at the beginning of
a period and the net asset value of that investment at the end of a period.  The
performance data used in advertisements  does not give effect to a 2% contingent
deferred sales charge that is no longer applicable.

All  performance  calculations  assume  that  dividends  and  distributions  are
reinvested  at the net asset  value on the  appropriate  reinvestment  dates and
include all recurring fees.

Computed in the manner  described above, the performance of BARON ASSET FUND has
been:

                                Average Annual Total Return       Actual Return*
                                (prior to January 1, 1992
                                includes the 2% contingent
                                deferred sales load where
                                investment is less than 3 years)

Year ended 12/31/99                         xx                           xx

Inception(06/12/87) to 12/31/99             xx                           xx

Five Years Ended 12/31/99                   xx                           xx

Ten Years Ended 12/31/99                    xx%%                         xx

*    Does not include the  2%contingent  deferred  sales load which applied only
     prior to 1/1/92.


For BARON GROWTH FUND the performance has been:

                                 Average Annual Total Return       Actual Return

Year Ended 12/31/99                          %                            %

Inception (01/03/95) to
Year Ended 12/31/99                          %                            %

For Baron SMALL CAP FUND the performance has been:

                                 Average Annual Total Return       Actual Return

Year Ended 12/31/99                          %                            %

Inception (10/01/97) to
Year Ended 12/31/99                          %                            %



Performance   results   represent  past  performance  and  are  not  necessarily
representative  of future  results.  Investment  return and principal value will
fluctuate so that shares may be worth more or less than their original cost when
redeemed.

In addition to advertising  average  annual and actual return data,  comparative
performance  information  may be used in advertising  materials about the Funds,
including data and other information from Lipper Analytical  Services,  Inc., DA
Investment Technologies, Morningstar Inc., Money, Forbes, SEI, Ibbotson, No Load
Investor,  Growth Fund Guide,  Fortune,  Barron's,The  New York  Times,The  Wall
Street  Journal,  Changing Times,  Medical  Economics,  Business Week,  Consumer
Digest,Dick Davis Digest,  Dickenson's  Retirement Letter,  Equity Fund Outlook,
Executive Wealth Advisor,  Financial World,  Investor's  Daily,  Time,  Personal
Finance, Investment Advisor, SmartMoney,  Rukeyser,  Kiplinger's, NAPFA News, US
News,  Bottomline,  Investors Business Daily,  Bloomberg Radio, CNBC, USA Today,
1998  Mutual  Fund  Report,  Mutual  Fund  Magazine,The  Street.com,   Bloomberg
Personal,   Worth,  Washington  Business  Journal,   Investment  News,  Hispanic
Magazine,  Institutional Investor,  Rolling Stone Magazine,  Microsoft Investor,
Individual Investor,  SmartMoney Interactive, Art & Auction, Dow Jones Newswire,
and/or Dow Jones News. The Fund may also use comparative  performance  data from
indexes such as the Dow Jones  Industrial  Average,  Standard & Poor's 400, 500,
Small Cap 600, 1,500, or Midcap 400, Value Line Index,  Wilshire 4,500, 5000, or
Small Cap; NASDAQ/OTC Composite,  New York Stock Exchange; and the Russell 1000,
2000, 2500, 3000, 2000 Growth, 2000 Value, or Midcap. With respect to the rating
services, the Fund may use performance information that ranks the Fund in any of
the following  categories:  all funds,  aggressive  growth  funds,  value funds,
mid-cap  funds,  small-cap  funds,  growth funds,  equity income funds,  and any
combination of the above listed categories.

<PAGE>
                          BARON ASSET FUND

                     PART C. OTHER INFORMATION


Item 23.  Exhibits

               a.  Declaration of Trust dated February 19, 1987.*
               b.  By-laws dated February 19, 1987.*
               c.  Specimen Share Certificates representing shares of
                   beneficial interest of $.01 par value.*
               d. (1)  Investment Advisory Agreement between
                       Baron Asset Fund and BAMCO, Inc.*
                  (2)  Investment Advisory Agreement between
                       Baron Growth Fund and BAMCO, Inc.*
                  (3)  Investment Advisory Agreement between
                       Baron Small Cap Fund and BAMCO, Inc.*
                  (4)  Investment Advisory Agreement between
                       Baron iOpportunity Fund and BAMCO, Inc.
               e.  Distribution Agreement with Baron Capital, Inc.*
               f.  Inapplicable.
               g. (1)  Custodian Agreement with The Bank of New York.*
                  (2)  Fee Schedule for Exhibit 8(a).*
               h.  Inapplicable.
               i.  Opinion and consent of counsel as to legality of shares
                   being registered (filed with Rule 24f-2 Notice).*
               j.  Consent of Independent Certified Public Accountants.
               k.  Inapplicable.
               l.  Letter agreement between the Registrant and the Purchaser
                   of the Initial Shares.*
               m.  Distribution Plan pursuant to Rule 12b-1.*
               n. (1)  Financial Data Schedule for Baron Asset Fund^
                  (2)  Baron Growth Fund^
                  (3)  Baron Small Cap Fund^
                  (4)  Baron iOpportunity Fund^
               o.  Rule 18f-3Plan*

     *   Previously filed.
     ^   To be filed by amendment
<PAGE>
ITEM 24.  PERSONS CONTROLLED BY OR UNDER COMMON CONTROL WITH REGISTRANT
          -------------------------------------------------------------

The  following   diagram   indicates  the  persons  under  common  control  with
Registrant, all of which are incorporated in New York.

     Ronald Baron

                 controls :     Baron Capital Group, Inc.

          and owns 100% of:     Baron Capital, Inc.
                                BAMCO, Inc.
                                Baron Capital Management, Inc.

Baron Capital,  Inc. serves as distributor of  Registrant's  shares and performs
brokerage  services for Registrant.  BAMCO, Inc. serves as investment adviser to
Registrant.  Baron Capital Management, Inc. is an affiliated investment adviser.
All of the above  corporate  entities file  consolidated  financial  statements.
Ronald Baron, Chairman and CEO of Registrant,  is the controlling shareholder of
Baron  Capital  Group,  Inc.  and  serves as  Chairman  and CEO of all the above
entities.

ITEM 25.  INDEMNIFICATION
          ---------------

Article IV of Registrant's Declaration of Trust states as follows:

     Section 4.1. No Personal Liability of Shareholders, Trustees, Etc.
     ------------------------------------------------------------------
     No shareholder shall be subject to any personal liability whatsoever to any
     Person in  connection  with  Trust  Property  or the acts,  obligations  or
     affairs of the Trust. No Trustee,  officer,  employee or agent of the Trust
     shall be subject to any personal liability  whatsoever to any Person, other
     than to the Trust of its shareholders, in connection with Trust Property of
     the affairs of the Trust,  save only that arising  from bad faith,  willful
     misfeasance,  gross  negligence  or reckless  disregard  of his duties with
     respect to such Person; and all such Persons shall look solely to the Trust
     Property, or to the Property of one or more specific series of the Trust if
     the claim  arises from the conduct of such  Trustee,  officer,  employee or
     agent with respect to only such Series,  for  satisfaction of claims of any
     nature  arising  in  connection  with  the  affairs  of the  Trust.  If any
     shareholder,  Trustee, officer,  employee, or agent, as such, of the Trust,
     is made a party to any suit or proceeding to enforce any such  liability of
     the  Trust,  he shall  not,  on account  thereof,  be held to any  personal
     liability.  The Trust shall  indemnify and hold each  shareholder  harmless
     from and against all claims and liabilities,  to which such shareholder may
     become  subject by reason of his being or having  been a  shareholder,  and
     shall  reimburse such  shareholder  out of the Trust Property for all legal
     and other expenses  reasonably  incurred by him in connection with any such
     claim or  liability.  Indemnification  and  reimbursement  required  by the
     preceding  sentence  shall be made  only out of  assets  of the one of more
     Series  whose shares were held by said  shareholder  at the time the act or
     event  occurred  which gave rise to the claim  against or liability of said
     shareholder. The rights accruing to a shareholder under this Section 4.1 be
     lawfully  entitled,  nor shall anything herein contained restrict the right
     of the Trust to  indemnify or reimburse a  shareholder  in any  appropriate
     situation even though not specifically provided herein.

<PAGE>
     Section 4.2. Non-Liability of Trustees, Etc.
     --------------------------------------------

     No Trustee,  officer, employee or agent of the Trust shall be liable to the
     Trust, its shareholders, or to any shareholder, Trustee, officer, employee,
     or agent  thereof  for any  action or  failure  to act  (including  without
     limitation the failure to compel in any way any former or acting Trustee to
     redress  any  breach  of  trust)  except  for his own  bad  faith,  willful
     misfeasance,  gross negligence or reckless disregard of the duties involved
     in the conduct of his office.

     Section 4.3. Mandatory Indemnification.
     ---------------------------------------
     (a) Subject to the  exceptions and  limitations  contained in paragraph (b)
     below:

          (i) every  person  who is, or has been,  a Trustee  or  officer of the
          Trust  shall be  indemnified  by the Trust,  or by one or more  Series
          thereof if the claim  arises from his or her conduct  with  respect to
          only such Series to the fullest  extent  permitted  by law against all
          liability and against all expenses  reasonably incurred or paid by him
          in connection with any claim,  action,  suit or proceeding in which he
          becomes  involved  as a party or  otherwise  by virtue of his being or
          having been a Trustee or officer and against  amounts paid or incurred
          by him in the settlement thereof;

          (ii) the words "claim,"  "action," "suit," or "proceeding" shall apply
          to all claims,  actions,  suits or proceedings  (civil,  criminal,  or
          other,  including  appeals),  actual  or  threatened;  and  the  words
          "liability"  and  "expenses"   shall  include,   without   limitation,
          attorneys' fees, costs, judgments, amounts paid in settlement,  fines,
          penalties and other liabilities.

     (b) No indemnification shall be provided hereunder to a Trustee or officer:

          (i)  against  any  liability  to the Trust or a Series  thereof or the
          shareholders  by reason  of  willful  misfeasance,  bad  faith,  gross
          negligence or reckless disregard of the duties involved in the conduct
          of his office;

          (ii) with respect to any matter as to which he shall have been finally
          adjudicated not the have acted in good faith in the reasonable  belief
          that his  action  was in the best  interest  of the  Trust or a Series
          thereof;

          (iii) in the event of a settlement or other  disposition not involving
          a final  adjudication as provided in paragraph  (b)(ii) resulting in a
          payment by a Trustee or officer, unless there has been a determination
          that such  Trustee or officer  did not engage in willful  misfeasance,
          bad  faith,  gross  negligence  or  reckless  disregard  of the duties
          involved in the conduct of his office:

                    (A) by the court or other body  approving the  settlement or
                    other disposition; or

                    (B)  based  upon a review  of  readily  available  facts (as
                    opposed  to a full  trial-type  inquiry)  by (x)  vote  of a
                    majority of the Non-interested Trustees acting on the matter
                    (provided  that a majority  of the  Non-interested  Trustees
                    then in office act on the matter) or (y) written  opinion of
                    independent legal counsel.

<PAGE>
                    (c) The rights of  indemnification  herein  provided  may be
                    insured against by policies  maintained by the Trust,  shall
                    be severable, shall not affect any other rights to which any
                    Trustee or officer may now or hereafter  be entitled,  shall
                    continue as to a person who has ceased to be such Trustee or
                    officer  and  shall  inure  to the  benefit  of  the  heirs,
                    executors,  administrators  and  assigns  of such a  person.
                    Nothing   contained   herein  shall  affect  any  rights  to
                    indemnification  to which  personnel of the Trust other than
                    Trustees  and  officers  may  be  entitled  by  contract  or
                    otherwise under law.

     (d) Expenses of  preparation  and  presentation  of a defense to any claim,
     action,  suit or proceeding of the character  described in paragraph (a) of
     this Section 4.3 may be advanced by the Trust or a Series  thereof prior to
     final disposition thereof upon receipt of an undertaking by or on behalf of
     the recipient to repay such amount if it is ultimately  determined  that he
     is not entitled to  indemnification  under this Section 4.3,  provided that
     either:

          (i)  such  undertaking  is  secured  by a  surety  bond or some  other
          appropriate security provided by the recipient, or the Trust or Series
          thereof  shall  be  insured  against  losses  arising  out of any such
          advances; or

          (ii) a majority of the  Non-interested  Trustees  acting on the matter
          (provided  that a majority of the  Non-interested  Trustees act on the
          matter) or an  independent  legal  counsel in a written  opinion shall
          determine,  based upon a review of readily available facts (as opposed
          to a full  trial-type  inquiry),  that there is reason to believe that
          the recipient ultimately will be found entitled to indemnification.

     As used in this Section 4.3, a  "Non-interested  Trustee" is one who is not
     (i) an  "Interested  Person"  of the Trust  (including  anyone who has been
     exempted from being an "Interested Person" by any rule, regulation or order
     of the  Commission),  or  (ii)  involved  in the  claim,  action,  suit  or
     proceeding.


ITEM 26. BUSINESS OR OTHER CONNECTIONS OF INVESTMENT ADVISER
         ---------------------------------------------------

The  business  and  other   connections  of  BAMCO,  Inc.  is  summarized  under
"Management  of  the  Fund"  in  the  Prospectus  constituting  Part  A  of  the
Registration Statement, which summary is incorporated herein by reference.

The business and other  connections of the officers and directors of BAMCO, Inc.
is  currently  listed in the  investment  adviser  registration  on Form ADV for
BAMCO, Inc. (File No. 801-29080) and is incorporated herein by reference.


ITEM 27. PRINCIPAL UNDERWRITERS
         ----------------------

     (a) Inapplicable.

<PAGE>
     (b)

        (1)                      (2)                         (3)

                            POSITIONS AND               POSITIONS AND
NAME AND PRINCIPAL          OFFICES WITH                OFFICES WITH
BUSINESS ADDRESS            UNDERWRITER                 REGISTRANT
- -------------------         -------------               --------------
Ronald Baron                Director,                   Trustee,
767 Fifth Avenue            Chairman and                Chariman and
New York, N.Y. 10153        CEO                         CEO

Susan Robbins               Director                    Vice President
767 Fifth Avenue            and Vice President
New York, N.Y. 10153

Peggy Wong                  Treasurer and CFO           Treasurer and CFO
767 Fifth Avenue
New York, N.Y. 10153

Morty Schaja                Senior Vice President       Trustee, Senior
767 Fifth Avenue            and COO                     Vice President and
New York, N.Y. 10153                                    COO

Clifford Greenberg          Vice President              Vice President
767 Fifth Avenue
New York, N.Y. 10153

Linda S. Martinson          Secretary, Vice President   Trustee, Vice
767 Fifth Avenue            and General Counsel         President and
New York, N.Y. 10153                                    Secretary

    (c) Inapplicable.

ITEM 28. LOCATION OF ACCOUNTS AND RECORDS
         --------------------------------

Certain accounts, books and other documents required to be maintained by Section
31 (a)  of  the  Investment  Company  Act of  1940  and  the  Rules  promulgated
thereunder  are  maintained at the offices of the  Registrant,  BAMCO,  Inc. and
Baron Capital,  Inc., 767 Fifth Avenue, New York, NY 10153.  Records relating to
the duties of the  Registrant's  transfer  agent are  maintained by DST Systems,
Inc.,  330 West 9th  Street,  Pointdexter  1, Kansas  City,  MO 64105 and of the
Registrant's  custodian  are  maintained  by The Bank of New  York,  100  Church
Street, New York, N.Y. 10286.

ITEM 29. MANAGEMENT SERVICES
         -------------------

Inapplicable.

<PAGE>
ITEM 30. UNDERTAKINGS
         ------------

Insofar as  indemnification  for liability  arising under the  Securities Act of
1933 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, 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 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.

                            SIGNATURES
                            ----------

Pursuant to the  requirement  of the  Securities  Act of 1933 and the Investment
Company Act of 1940, the Fund  (certifies  that it meets all of the  requirement
for  effectiveness  of this  registration  statement under rule 485(b) under the
Securities Act and) has duly caused this post -effective amendment No. 16 to the
registration  statement  to be signed on its  behalf  by the  undersigned,  duly
authorized,  in the City of New York,  and the State of New York on the 22nd day
of October 22, 1999.

                            BARON ASSET FUND


                            By:  /s/ Ronald Baron
                                 ----------------
                                     Ronald Baron, Chairman and CEO


<PAGE>
Pursuant to the requirements of the Securities Act of 1933, this  post-effective
amendment  No. 17 to the  registration  statement  has been signed  below by the
following persons in the capacities and on the dates indicated.


SIGNATURES                   TITLE                             DATE
- ----------                   -----                             ----

/s/ Ronald Baron             Chairman, CEO                     October 22, 1999
- -------------------------    & Trustee
    Ronald Baron


/*s/ Raymond Noveck          Trustee                           October 22, 1999
- -------------------------
     Raymond Noveck


/s/ Linda S. Martinson       Secretary,                        October 22, 1999
- -------------------------    Vice President & Trustee
    Linda S. Martinson


/s/ Peggy Wong               Treasurer (Principal              October 22, 1999
- -------------------------    Financial & Accounting
    Peggy Wong               Officer)


/*s/ Mark M. Feldman         Trustee                           October 22, 1999
- -------------------------
     Mark M. Feldman


/*s/ Norman S. Edelcup       Trustee                           October 22, 1999
- -------------------------
     Norman S. Edelcup


/*s/ Charles N. Mathewson    Trustee                           October 22, 1999
- -------------------------
     Charles N. Mathewson


/*s/ Irwin Greenberg         Trustee                           October 22, 1999
- -------------------------
     Irwin Greenberg


/*s/ David A. Silverman      Trustee                           October 22, 1999
- -------------------------
     David A. Silverman


/s/ Morty Schaja             Senior Vice President,            October 22, 1999
- -------------------------    Chief Operating Officer &
    Morty Schaja             Trustee


*By: /s/ Linda S. Martinson
     -----------------------
         Linda S. Martinson
         Attorney-in-fact pursuant to a power of attorney previously filed.


Dated: October 22, 1999
<PAGE>

APPENDIX B
- ----------


                         BAR CHART AND PERFORMANCE TABLE
                         -------------------------------

The  following  table  provides an  indication  of the risks of investing in the
Baron Funds by showing changes in the Funds' performance from year to year, over
a 10-year  period and by showing how the Funds'  average annual returns for one,
five and ten  years  compared  to  those  of the  Russell  2000,  a  broad-based
securities  market  index.  How  the  Fund  has  performed  in the  past  is not
necessarily an indication of how the Fund will perform in the future.




 50%

 40%

 30%

 20%                     [bar chart]

 10%

  0%

- -10%
     1989   1990   1991   1992   1993   1994   1995   1996   1997   1998   1999


During the period shown in the bar chart,  the highest return for a quarter was:
% (quarter ending ) and the lowest return for a quarter was % (quarter ending ).



Average Annual
Total Returns
(for the period ending      Past One Year      Past 5 Years       Past 10 Years
December 31, 1999)

Baron Asset Fund

Baron Growth Fund

Baron Small Cap Fund

Russell 2000*



*    The  Russell  2000  is  a  widely  recognized   unmanaged  index  of  small
     capitalization stocks.




                        ADVISORY AGREEMENT

     This Advisory  Agreement,  made this day of , by and between BAMCO, Inc., a
New York corporation  ("BAMCO") and Baron  iOpportunity  Fund, a series of Baron
Asset Fund, a Massachusetts business trust ("Client"),

     Whereas Client is an open-end,  diversified  management  investment company
and is  registered  under the  Investment  Company Act of 1940,  as amended (the
"1940  Act"),  that wishes to employ  BAMCO to manage  Client's  portfolio  (the
"Account"),  upon the terms and subject to the conditions hereinafter set forth;
and

     Whereas  BAMCO is an investment  adviser  registered  under the  Investment
Advisers Act of 1940,  as amended,  that is willing to manage the Account in the
manner, upon the terms and subject to the conditions hereinafter set forth;

     Now  Therefore,  in  consideration  of the premises  and mutual  agreements
hereinafter set forth, the parties hereby agree as follows:

     1. The  Account  shall  consist  of such  cash,  stocks,  bonds  and  other
securities  which,  from time to time,  Client places under the  supervision  of
BAMCO and/or which shall become part of the Account as a result of  transactions
therein,  deposits  of cash  proceeds  from  the  sale  of  Client's  shares  or
otherwise.

     2. Subject to the  supervision  of the Trustees of the Client,  BAMCO shall
have full  discretion  and  authority  to manage  the  Account,  subject to such
policies as set forth in Client's  prospectus.  Client shall provide the Adviser
with copies of its current  prospectus  and statement of additional  information
which set forth the investment objectives,  policies and investment restrictions
of the Account,  Declaration of Trust and By-laws.  BAMCO, as Client's agent and
attorney in fact and at Client's  expense,  is duly  authorized  without further
approval with respect to the Account,  except as otherwise  required by law, (a)
to make all  investment  decisions;  (b) to vote all  proxies  with  respect  to
portfolio  securities in the Account;  (c) to buy,  sell and otherwise  trade in
securities;  and (d) in furtherance of the foregoing, to do anything which BAMCO
shall deem requisite,  appropriate or advisable,  including, without limitation,
the  submission  of  instructions  to the  custodian  of the  Account,  and  the
selection of such brokers or dealers as BAMCO shall determine.

     3.(a) For BAMCO's  services as investment  adviser to Client,  Client shall
pay BAMCO an advisory  fee  computed  daily and payable  monthly  from  Client's
assets equal to 1% per annum of the Client's  average daily net asset value. The
fee shall be paid in  arrears,  within  thirty  (30) days  after the end of each
month.  BAMCO agrees that it will limit its fees so that  clients'  total annual
operating  expenses are 1.5%.  The net asset value is determined as of the close
of the New York Stock  Exchange  on each day the  Exchange  is open.  Securities
traded on any national  stock exchange or quoted on the NASDAQ  National  Market
System are valued on the basis of the last sale price,  or in the absence of any
sale on the date of valuation, the last sale price on the date the security last
traded.  Other  securities will be valued at the mean of the most recent bid and
asked  prices if market  quotations  are not  readily  available.  Where  market
quotations are not readily available the securities will be valued at their fair
value as determined in good faith by Client's  Trustees or their  delegate.  Odd
lot differentials and brokerage  commissions will be excluded in calculating net
asset value.

     (b) If BAMCO  should  serve  for  less  than the  whole of any  month,  its
compensation  shall be  determined  on the basis of the average  daily net asset
value of the Account for the month up to and including the date of termination.

     (c)  If  Client's  expenses  (exclusive  of  interest,   taxes,  brokerage,
extraordinary  expenses and amounts paid by Client pursuant to its  distribution
plan) in any fiscal  year  exceed the  limits  prescribed  by any state in which
Client's shares of common stock  ("Shares") are qualified for sale, BAMCO shall,
at each contract payment date,  reduce its fee by the amount of any excess up to
the amount of BAMCO's advisory fee as determined hereunder. Client undertakes to
notify BAMCO of each state in which Client's Shares are qualified for sale.

<PAGE>

     4.(a) BAMCO shall furnish office space and all necessary office facilities,
equipment and executive personnel for managing the Account without reimbursement
from Client.

     (b) BAMCO shall pay the  salaries  and fees of all officers and trustees of
Client who are "interested persons" (as defined in the 1940 Act) of BAMCO.

     (c) BAMCO shall not be obligated to pay the following expenses:  (a) audit,
accounting and legal fees;  (b) custodian  fees;  (c) fees for  registering  and
qualifying  Client's Shares with federal and state securities  commissions;  (d)
fees for preparing  shareholder  reports and proxy solicitation  materials;  (e)
fees associated with Client's Shares such as administrative servicing,  dividend
disbursing,  transfer agent and registrar fees; (f) insurance ; (g) compensation
of  Trustees  of  Client  who  are  not  "interested   persons"  of  BAMCO;  (h)
miscellaneous  business  expenses that are not within  paragraph 4(a) above; (i)
costs  associated  with  the  public  offering  of  Client's  Shares,  including
registration,  filing,  legal and accounting fees and costs of printing Client's
prospectus  and  other  offering   documents;   (j)  taxes;  and  (k)  brokerage
commissions and fees incurred in connection with portfolio transactions.

     (d) BAMCO shall  maintain  all books and records  with  respect to Client's
securities  transactions required by subparagraphs (b)(5), (6), (9) and (10) and
paragraph  (f) of Rule  31a-1  under the 1940 Act and shall  render to  Client's
Trustees  such  periodic  and special  reports as the  Trustees  may  reasonably
request.

     (e) BAMCO  shall  provide  Client's  Custodian  on each  business  day with
information relating to the execution of all portfolio  transactions pursuant to
standing instructions.

     (f) The investment  management  services  provided by the Adviser hereunder
are not to be  deemed  exclusive,  and  BAMCO  shall be free to  render  similar
services to others.

     5. Client has delivered to BAMCO copies of each of the following  documents
and will  deliver to it all  future  amendments  and  supplements,  if any:  (a)
Declaration  of Trust of the  Trust,  filed with the  Secretary  of The State of
Massachusetts (such Declaration of Trust, as in effect on the date hereof and as
amended from time to time, is herein called the "Declaration of Trust");

     (b) By-laws of the Trust (such By-laws, as in effect on the date hereof and
as amended from time to time, are herein called the "By-laws");

     (c)  Certified  resolutions  of the  Trustees  of  Client  authorizing  the
appointment of BAMCO and approving the form of this Agreement;

     (d)  Registration  Statement  under the 1940 Act and the  Securities Act of
1933, as amended, on Form N-1A (the "Registration Statement"), as filed with the
Securities and Exchange  Commission  (the  "Commission")  relating to Client and
Client's Shares and all amendments thereto;

     (e)  Notification  of Registration of the Client under the 1940 Act on Form
N-8A as filed with the Commission and all amendments thereto; and

     (f) Prospectus  and Statement of Additional  Information of the Trust (such
Prospectus and Statement of Additional  Information,  as currently in effect and
as  amended  or  supplemented  from  time  to  time,  being  herein  called  the
"Prospectus").

     6. BAMCO shall keep Client's books and records required to be maintained by
it  pursuant  to  paragraph 9 hereof.  BAMCO  agrees  that all records  which it
maintains  for Client are the  property  of the  Client,  and it will  surrender
promptly to the Client any of such records upon Client's request.  BAMCO further
agrees to preserve for the periods  prescribed by Rule 31a-2 as  promulgated  by
the  Commission  under  the 1940  Act any such  records  as are  required  to be
maintained by BAMCO pursuant to paragraph 9 hereof.

     7.(a) BAMCO  understands that it is the policy of Client to obtain the best
net results for Client's shareholders in the execution of brokerage transactions
for the Account.  BAMCO shall select all brokers in accordance  with such policy
and as set forth below.

     (b) BAMCO may use Baron Capital,  Inc. ("BCI"), a broker-dealer  affiliated
with BAMCO,  as broker as long as BCI's  execution of transactions is consistent
with Client's policy referred to above.

     (c) Client  represents  and  warrants  that it has  adopted  procedures  in
conformity  with Rule 17e-1  ("Procedures")  of the 1940 Act to ensure  that all
brokerage  commissions paid to BCI are reasonable and fair.  Client shall inform
BAMCO of such Procedures and any amendments thereto.  BAMCO shall provide Client
with such information as is required by the Procedures,  including,  among other
things, a written record of each portfolio transaction effected pursuant to Rule
17e-1,  setting  forth the  amount and  source of the  commission,  fee or other
remuneration  received or to be received;  the identity of the person  acting as
broker; the terms of the transaction;  and, each quarter, such information as is
necessary  to enable  Client  to  determine  whether  its  procedures  have been
followed.

<PAGE>

     (d) For  BCI's  services  as  broker  to  Client,  Client  shall pay to BCI
brokerage  commissions  consistent  with Rule 17e-1 that are fair and reasonable
compared to the commission,  fee or other remuneration received by other brokers
in connection with comparable  transactions  involving similar  securities being
purchased or sold on a securities exchange during a comparable period of time.

     (e) Where brokers and dealers  other than BCI are used to effect  portfolio
transactions, BAMCO may pay to those brokers and dealers, in return for research
analysis, advice and similar services and/or promotion of the Client's Shares, a
higher  commission  or spread  than may be  charged  by BCI or other  brokers or
dealers,  if BAMCO  determines  that such commission or spread is reasonable and
consistent  with the Client's  policies.  Client  agrees that such  research and
information  may be used by BAMCO to  supplement  the services it is required to
perform hereunder.  Whether using BCI or others,  BAMCO shall have no obligation
to seek the lowest  commission  cost to Client.  BAMCO's  selection  of a broker
other  than BCI will take into  account  factors  such as:  price,  reliability,
financial responsibility,  commission rates, the ability of the broker to effect
particular securities  transactions,  and research and similar services,  all of
which may enhance general portfolio management capabilities for BAMCO and/or its
affiliates,  notwithstanding  that  Client  may not be the  direct or  exclusive
beneficiary of such services.

     8. BAMCO and/or BCI shall direct the  clearing  broker to send  promptly to
Client  confirmations of purchases and sales and monthly statements  prepared by
the clearing  broker.  BAMCO shall  provide  Client with  monthly and  quarterly
statements.  On the  written  request of Client,  BAMCO  and/or BCI will send or
direct the sending of any copies of the foregoing to any other person.

     9. BAMCO  shall keep the books of account of the Fund and  compute  the net
asset value per share of the  outstanding  Shares.  BAMCO  shall also  calculate
daily the net investment income of the Fund as described in the Fund's currently
effect  Prospectus and shall advise the Fund and the transfer agent daily of the
total  amounts of such  investment  income and, if  instructed  in writing by an
officer of the Fund to do so, shall advise the transfer  agent  periodically  of
the division of such net  investment  income among its various  components.  The
calculations  of the net asset value per share and the daily  income of the Fund
shall be made at the time or times  described  from  time to time in the  Fund's
currently  effective  Prospectus.  BAMCO  shall  submit  to all  regulatory  and
administrative  bodies having jurisdiction over the services provide pursuant to
this Agreement,  present or future, any information,  reports, or other material
which any such body by reason of this Agreement may request or require  pursuant
to applicable laws and regulations.  BAMCO shall not disclose or use any records
it has prepared by reason of this  Agreement  in any manner  except as expressly
authorized  herein or  directed  by the Fund and  shall  keep  confidential  any
information obtained by reason of this Agreement.

     10. Client  understands and agrees that: (a) BAMCO is affiliated with Baron
Capital Management,  Inc. a registered  investment adviser; (b) BAMCO and/or its
affiliates will manage accounts and perform  advisory  services for others;  (c)
depending upon investment  objectives and cash  availability  and  requirements,
BAMCO and/or its  affiliates  may direct the sale of a  particular  security for
certain  accounts and direct the purchase of such  security for other  accounts,
and, accordingly, transactions in particular accounts may not be consistent with
transactions  in other  accounts;  (d)  where  there is a  limited  supply  of a
security,  BAMCO in  conjunction  with its affiliates  will allocate  investment
opportunities  in a matter  deemed  equitable  by BAMCO;  (e) BAMCO  and/or  its
affiliates,  principals  and  employees  may from time to time have an interest,
direct or indirect,  in a security which is purchased,  sold or otherwise traded
for the Account, and BAMCO and/or its affiliates may effect transactions in said
security for the Account  which may be the same as or different  from the action
which BAMCO,  its affiliates or such other persons may take with respect thereto
for its or their accounts.

     11.  Client and BAMCO  represent  and warrant that each (i) has adopted and
supplied to one another a copy of a written code of ethics  complying  with Rule
17j-1 of the  Investment  Company Act of 1940, and (ii) will obtain such reports
and maintain such records as are specified in Rule 17j-1.

     12. Client  acknowledges  that the word "Baron" in Client's name is derived
from the name of the entities controlling, directly and indirectly, BAMCO, which
derive their names from Mr. Ronald Baron;  and that such name is the property of
BAMCO,  its  affiliated  companies and Ronald Baron for  copyright  and/or other
similar purposes.  Client  understands and agrees that Client may use "Baron" as
part of its name for so long as BAMCO  serves as  investment  adviser to Client,
and if BAMCO ceases to be Client's investment adviser, Client will promptly take
all steps  necessary  to change its name (to the extent it lawfully  can) to one
that does not include "Baron," absent BAMCO's written consent.

<PAGE>

     13.  BAMCO shall have no liability  to Client or its  shareholders  for any
error of judgment or mistake of law or for any loss suffered by Client, provided
that  BAMCO  shall not be  protected  against  liabilities  arising by virtue of
willful  misfeasance,  bad faith or gross negligence,  or reckless  disregard of
BAMCO's obligations hereunder.

     14. Nothing in this  Agreement  shall limit or restrict the right of any of
BAMCO's directors,  officers, or employees who may also be a Trustee, officer or
employee  of Client to engage in any other  business  or to devote  his time and
attention in part to the management or other aspects of any business, whether of
a similar or a dissimilar  nature, nor limit or restrict BAMCO's right to engage
in  any  other  business  or to  render  services  of  any  kind  to  any  other
corporation, trust, firm, individual or association.

     15.  Except as otherwise  provided  herein or authorized by the Trustees of
Client from time to time, BAMCO shall for all purposes herein be deemed to be an
independent  contractor  and shall  have no  authority  to act for or  represent
Client in any way or otherwise be deemed an agent of Client.

     16.  During the term of this  Agreement,  Client agrees to furnish BAMCO at
its  principal   office  all   prospectuses,   proxy   statements,   reports  to
shareholders,  sales  literature or other material  prepared for distribution to
shareholders of Client or to the public,  which refer to BAMCO in any way, prior
to use  thereof  and not to use such  material  if BAMCO  reasonably  objects in
writing within five business days (or such other time as may be mutually agreed)
after receipt  thereof.  In the event of termination of this  Agreement,  Client
will continue to furnish to BAMCO copies of any of the above-mentioned materials
which  refer  in any way to  BAMCO.  Client  shall  furnish  or  otherwise  make
available to BAMCO such other  information  relating to the business  affairs of
Client as BAMCO at any time, or from time to time,  reasonably requests in order
to discharge its obligations hereunder.

     17. This Agreement  shall continue in effect for a period of two years from
the date of its execution,  and thereafter  only so long as such  continuance is
specifically  approved at least annually by Client's  Trustees or by a vote of a
majority of the  Trustees who are not parties to this  Agreement  or  interested
persons of any such party.

     18. This  Agreement may be  terminated at any time,  without the payment of
any  penalty,  by the  Trustees  of  Client  or by  vote  of a  majority  of the
outstanding  voting  Shares of Client  (as  defined in the 1940 Act) on not more
than  sixty  days'  written  notice to BAMCO or by BAMCO on not more than  sixty
days' written notice to Client.

     19.  This  Agreement  shall  terminate  automatically  in the  event of its
assignment (as defined in the 1940 Act) by either party.

     20. This  Agreement  shall be construed in accordance  with and governed by
the laws of the State of New York, to the extent federal law does not apply.

     21. BAMCO shall have no responsibility of liability with respect to custody
arrangements or the acts, omissions or other conduct of the custodian.

     22. It is understood  and expressly  stipulated  that none of the Trustees,
officers,  agents  or  shareholders  of the  Fund  shall  be  personally  liable
hereunder. All persons dealing with the Fund must look solely to the property of
the Fund for the  enforcement  of any claims  against  the Fund as  neither  the
Trustees,  officers,  agents or shareholders  assume any personal  liability for
obligations entered into on behalf of the Fund.

     23. Any notice or other communication required to be given pursuant to this
Agreement shall be deemed duly given if delivered or mailed by registered  mail,
postage prepaid,  (1) to BAMCO at 767 Fifth Avenue, New York, New York 10153; or
(2) to the Client at 767 Fifth Avenue, New York, New York 10153.

     24. This Agreement  contains the entire agreement and may not be amended or
modified in any respect unless in a writing  signed by both parties  obtained in
conformity with the  requirements of the 1940 Act and the Rules  thereunder.  In
the event that any  provision  of this  Agreement is declared to be invalid such
declaration shall not be deemed to affect the validity of any of the provisions.

     25.  Client  acknowledges  receipt of Part II of BAMCO's  Form ADV which is
filed  with  the  Securities  and  Exchange   Commission,   and  which  contains
information concerning BAMCO's services and fees.

<PAGE>

Agreed to as of October    , 1999
New York, New York

                                        BAMCO, INC.
                                        By:


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



                                        BARON iOPPORTUNITY FUND
                                        By:



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



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