CALAMOS INVESTMENT TRUST/IL
485APOS, 2000-06-01
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<PAGE>   1

      As filed with the Securities and Exchange Commission on June 1, 2000

                                        Securities Act registration no. 33-19228
                                        Investment Company Act file no. 811-5443

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

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                    FORM N-1A

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           REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933       [ ]
                       POST-EFFECTIVE AMENDMENT NO. 22                   [X]


                                       and


       REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940   [ ]
                              AMENDMENT NO. 254                          [X]


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

                            CALAMOS INVESTMENT TRUST
                                  (Registrant)

                           1111 East Warrenville Road
                         Naperville, Illinois 60563-1493

                         Telephone number: 630-245-7200

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

      James S. Hamman, Jr., Secretary        Cameron S. Avery
      Calamos Asset Management, Inc.         Bell, Boyd, & Lloyd
      1111 East Warrenville Road             70 West Madison Street, Suite 3300
      Naperville, Illinois 60563-1493        Chicago, Illinois 60602-4207
                              (Agents for service)

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

It is proposed that this filing will become effective:


            immediately upon filing pursuant to paragraph (b) of rule 485
    -----
            on ________ pursuant to paragraph (b) of rule 485
    -----
            60 days after filing pursuant to paragraph (a)(1) of rule 485
    -----
            on ________ pursuant to paragraph (a)(1) of rule 485
    -----
      X     75 days after filing pursuant to paragraph (a)(2) of rule 485
    -----
            on ________ pursuant to paragraph (a)(2) of rule 485
    -----
            on ________ pursuant to paragraph (a)(3) of rule 485
    -----



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              Amending Parts A, B and C, and adding a new series.
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<PAGE>   2


         SUPPLEMENT DATED AUGUST 1, 2000 TO PROSPECTUS OF SAME DATE


                           CALAMOS(R) FAMILY OF FUNDS


                              INSTITUTIONAL SHARES

                     MINIMUM INITIAL INVESTMENT: $5 MILLION

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


This prospectus, as supplemented, offers Class I shares ("Institutional Shares")
of each of Convertible Fund, Convertible Growth and Income Fund (formerly named
Growth and Income Fund), Market Neutral Fund, Growth Fund, Global Convertible
Fund (formerly named Global Growth and Income Fund), High Yield Fund and Global
Convertible Technology Fund. Each of those Funds also currently offers three
other classes of shares, Class A, Class B and Class C, that have substantially
lower minimum investment requirements but bear certain expenses not borne by the
Institutional Shares.

Institutional Shares of each Fund are offered without any sales charge and are
not subject to any 12b-1 charges. As a result of the relatively lower expenses
for Institutional Shares, the level of income dividends per share (as a
percentage of net asset value) and, therefore, the overall investment return,
will typically be higher for Institutional Shares than for Class A, Class B or
Class C shares.

All classes of shares of a Fund represent interests in the same portfolio of
investments of the Fund. The minimum initial investment in Institutional Shares
is $5 million; provided, however, that Class I shares are available for purchase
without a minimum initial investment by tax-qualified employee benefit plans
sponsored by Calamos Asset Management, Inc. or Calamos Financial Services, Inc.
for their employees; and provided further that such minimum may be waived by a
Fund. Shares are redeemable at net asset value, which may be more or less than
original cost.

The following information supplements the indicated sections of the prospectus.

PAST PERFORMANCE

The charts and tables in the accompanying prospectus provide some indication of
the risks of investing in the Funds by showing changes in the Funds' performance
from calendar year to calendar year and how the Funds' average annual total
returns compare with those of a broad measure of market performance. Of course,
past performance does not predict how a Fund will perform in the future.
Additional financial information for those Funds which currently have Class I
shares outstanding is set forth below.

Average Annual Total Returns - Class I shares

<TABLE>
<CAPTION>

For periods ended
December 31, 1999                                    One Year          Since Class Inception*
-----------------                                    --------          ----------------------
<S>                                                  <C>               <C>
Calamos Convertible Fund                                    %                               %
Value Line Convertible Index+                               %                              ___

</TABLE>

* Inception date for Class I shares is 6/25/97.
+ The Value Line Convertible Index is an unmanaged index considered
representative of the convertible securities market. The index includes 585
convertible bonds and preferred stocks. Selection is based on issue size and
trading statistics. Index returns assume reinvestment of dividends and, unlike
Fund returns, do not reflect any fees, expenses or sales charges.




<PAGE>   3



<TABLE>
<CAPTION>

For periods ended
December 31, 1999                                    One Year          Since Class Inception*
-----------------                                    --------          ----------------------
<S>                                                  <C>               <C>
Calamos Convertible Growth and Income Fund                  %                               %
Value Line Convertible Index+                               %                             ___

</TABLE>

* Inception date for Class I shares is 9/18/97.
+ The Value Line Convertible Index is an unmanaged index considered
representative of the convertible securities market. The index includes 585
convertible bonds and preferred stocks. Selection is based on issue size and
trading statistics. Index returns assume reinvestment of dividends and, unlike
Fund returns, do not reflect any fees, expenses or sales charges

<TABLE>
<CAPTION>

For periods ended
December 31, 1999                                    One Year          Since Class Inception*
-----------------                                    --------          ----------------------
<S>                                                  <C>               <C>
Calamos Growth Fund                                         %                               %
Standard & Poor's 500 Index+                                %                             ___

</TABLE>

* Inception date for Class I shares is 9/18/97.
+ The S & P 500 Index is an unmanaged index generally considered representative
of the U.S. stock market. Index returns assume reinvestment of dividends and,
unlike Fund returns, do not reflect any fees, expenses or sales charges.

<TABLE>
<CAPTION>

For periods ended
December 31, 1999                                    One Year          Since Class Inception*
-----------------                                    --------          ----------------------
<S>                                                  <C>               <C>
Calamos Global Convertible Fund                              %                              %
Morgan Stanley Capital Intentional World Index+              %                            ___

</TABLE>

* Inception date for Class I shares is 9/18/97.
+ The Morgan Stanley Capital International World Index is an unmanaged equity
index that is an arithmetic, market value-weighted average of the performance of
over 1,460 securities listed on stock exchanges around the world. Index returns
assume reinvestment of dividends and, unlike Fund returns, do not reflect any
fees, expenses or sales charges.



EXPENSES


The following tables describe the fees and expenses that you may pay if you buy
and hold Class I shares of the Funds.


<TABLE>
<CAPTION>

                                                                        Convertible
                                                                        -----------
Global                                                               Growth and Market                       Global High Convertible
------                                                               -----------------                       -----------------------
                                                                        Convertible
                                                                        -----------
                                                        Convertible    Income      Neutral    Growth                 Convertible
                                                           Yield     Technology
                                                            Fund        Fund        Fund      Fund      Fund   Fund      Fund
                                                            ----        ----        ----      ----      ----   ----      ----
SHAREHOLDER FEES
(FEES PAID DIRECTLY FROM YOUR INVESTMENT)
<S>                                                         <C>         <C>         <C>       <C>       <C>    <C>       <C>
     Maximum sales charge (load) on purchases
         (as a percentage of offering price)                None        None        None      None      None    None     None
     Maximum sales charge (load) on reinvested
         dividends/distributions......................      None        None        None      None      None    None     None
     Maximum deferred sales charge
     (load) (as a percentage of redemption proceeds)..      None        None        None      None      None    None     None
     Exchange fee.....................................      None        None        None      None      None    None     None
     Redemption fee (a)...............................      None        None        None      None      None    None     None
</TABLE>




                                       4
<PAGE>   4


<TABLE>
<CAPTION>

                                                                     Convertible                                   Global
                                                                     -----------                                   ------
                                                                  Growth and Market                 Global     High Convertible
                                                                  -----------------                 ------     ----------------

                                                         Convertible   Income      Neutral    Growth    Convertible    Yield
                                                         Technology
                                                            Fund        Fund        Fund      Fund     Fund     Fund    Fund
                                                            ----        ----        ----      ----     ----     ----    ----
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS)
<S>                                                        <C>         <C>         <C>      <C>       <C>      <C>
     Management fees.................................         %        .75%        .75%     1.00%     1.00%     .75%     1.00%
     Distribution (12b-1) fees.......................      None        None        None      None      None     None      None
     Other expenses..................................         %           %           %(c)      %         %
         %(c).................................___%(c)
     Total Annual operating expenses (b).............         %           %           %         %         %        %         %
     Fee Waiver and/or expense reimbursement.........        ---         ---         ---        %         %        %         %
     Net expenses....................................        ---         ---         ---    1.50%     1.50%    1.50%     1.50%

</TABLE>


(a)  A service charge of $9 is deducted from proceeds of redemptions paid by
     wire.

(b)  Pursuant to a written agreement, Calamos Asset Management, Inc. (CAM) has
     voluntarily undertaken to limit the annual ordinary operating expenses of
     Institutional Shares of each Fund, as a percentage of the average net
     assets of the class, to 1.50%. The fee waiver and/or reimbursement is
     binding on CAM through August 31, 2001.

(c)  "Other Expenses" are based on estimated amounts for the current fiscal year
     for the Market Neutral Fund and High Yield Fund since no Class I shares
     were issued as of each Fund's fiscal year end, and for the Global
     Convertible Technology Fund, which is expected to commence operations on or
     about August 1, 2000.

EXAMPLES: Based on the figures above (including, where applicable, one year of
expenses capped by the investment manager), these examples are intended to help
you compare the cost of investing in a Fund with the cost of investing in other
mutual funds.

These examples show an investment made and held for one year, three years, five
years and ten years. In each case, we assume 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. These examples also assume that your investment has a 5% return
each year and that the Fund's operating expenses remain the same. Although your
actual costs may be higher or lower, based on these assumptions your costs would
be:


<PAGE>   5



<TABLE>
<CAPTION>


                                                One               Three            Five              Ten
                                                Year              Years            Years            Years
                                                ----              -----            -----            -----
<S>                                             <C>               <C>              <C>              <C>
      Convertible Fund                            $                 $                $                $
      Convertible Growth and Income Fund          $                 $                $                $
      Market Neutral Fund                         $                 $                $                $
      Growth Fund                                 $                 $                $                $
      Global Convertible Fund                     $                 $                $                $
      High Yield fund                             $                 $                $                $
      Global Convertible Technology Fund          $                 $                N/A               N/A

</TABLE>







                                       4

<PAGE>   6

FINANCIAL HIGHLIGHTS


The tables below are intended to help you understand the Funds' financial
performance for the period shown below. Certain information reflects financial
results for a single Fund share. The Total return figures show what an investor
in a Fund would have earned (or lost) if all distributions had been reinvested.
This information has been audited by Ernst & Young LLP whose report, along with
the Funds' financial statements, are included in the Funds' annual report, which
is available upon request. No financial information is presented for
Institutional Shares of the Market Neutral Fund and High Yield Fund since no
Institutional Shares had been issued as of the Fund's fiscal year end, or Global
Convertible Technology Fund, which is expected to commence operations on or
about August 1, 2000.






Convertible Fund



<TABLE>
<CAPTION>

                                                      Year Ended          Year Ended              6/25/97 -
                                                        3/31/00           3/31/99                  3/31/98
                                                    ----------------      ----------------      ---------------
<S>                                                 <C>                   <C>                   <C>
Net asset value, beginning of period                $                     $17.47                   $15.88

Net income from investment operations:
   Net investment income                                                  .50                         .37
   Net realized and unrealized gain on investments                        .09                        2.49
     Total from investment operations                                     .59                        2.86

Less distributions:
   Dividends from net investment income                                   (.47)                     (.54)
   Dividends from net realized capital gains                              (.38)                     (.63)
   Distributions from paid in capital                                       -                       (.10)
     Total distributions                                                  (.85)                    (1.27)

Net asset value, end of period                      $                     $17.21                  $ 17.47

Total return (a)                                             %            3.7%                      18.8%

Ratios and supplemental data:
   Net assets, end of period (000)                  $                     $34,725               $35,951
   Ratio of expenses to average net assets                   %            0.9%                      0.9%*
   Ratio of net investment income to average net assets      %            3.1%                      2.9%*

</TABLE>



<TABLE>
<CAPTION>
                                                      Year Ended             Year Ended              6/25/97-
                                                        3/31/00                3/31/99               3/31/98
                                                    ----------------       ----------------      ----------------
<S>                                                 <C>                    <C>                   <C>
Portfolio turnover rate                                      %                  78.2%                 76.0%

</TABLE>



----------
(a)  Total return is not annualized.


*Annualized

                                       4


<PAGE>   7



Convertible Growth and Income Fund
<TABLE>
<CAPTION>


                                                      Year Ended         Year Ended               9/18/97 -
                                                      ----------         ----------               ---------
                                                        3/31/00            3/31/99                3/31/98
                                                    ----------------   ---------------        ----------------
<S>                                                 <C>                  <C>                   <C>
Net asset value, beginning of period                $                    $18.61                    $17.96

Net income from investment operations:
   Net investment income                                                 .54                          .22
   Net realized and unrealized gain on investments                       .75                         2.14
     Total from investment operations                                    1.29                        2.36


Less distributions:
   Dividends from net investment income                                  (.43)                      (.38)
   Dividends from net realized capital gains                             (1.17)                    (1.33)

     Total distributions                                                 (1.60)                    (1.71)

Net asset value, end of period                      $                    $18.30                   $ 18.61

Total return (a)                                                  %      7.5%                       14.4%

Ratios and supplemental data:
   Net assets, end of period (000)                  $                    $1,976                   $ 1,838
   Ratio of expenses to average net assets                        %      1.3%                       1.5%*
   Ratio of net investment income to average net
   assets                                                         %      2.9%                       2.4%*



                                                      Year Ended           Year Ended              9/18/97-
                                                      ----------           ----------              --------
                                                        3/31/00              3/31/99               3/31/98
                                                    ----------------     ----------------     ----------------
Portfolio turnover rate                                           %           87.5%                 115.5%

</TABLE>


----------
(a) Total return is not annualized.
*Annualized







<PAGE>   8


Growth Fund
<TABLE>
<CAPTION>

                                                      Year Ended           Year Ended            9/18/97 -
                                                        3/31/00              3/31/99             3/31/98
                                                    ----------------     ----------------     ----------------

<S>                                                 <C>                  <C>                  <C>
Net asset value, beginning of period                $                        $20.12               $24.32

Net income from investment operations:
   Net investment income                                                      (.21)                (.11)
   Net realized and unrealized gain on investments                            3.80                  1.07
     Total from investment operations                                         3.59                   .96

Less distributions:

   Dividends from net realized capital gains                                     --               (4.98)

   Distributions from paid in capital                                            --                (.18)
     Total distributions                                                         --               (5.16)

Net asset value, end of period                      $                        $23.71               $20.12

Total return (a)                                                  %           17.8%                 6.4%
Ratios and supplemental data:
   Net assets, end of period (000)                  $                        $1,792               $1,508
   Ratio of expenses to average net assets (b)                    %           1.5%                 1.5%*
   Ratio of net investment income to average net                  %          (1.1)%              (1.1)%*
assets
</TABLE>


<TABLE>


                                                                            Year Ended           9/18/97 -
                                                       3/31/00               3/31/99              3/31/98
                                                    ---------------       ---------------      ---------------
<S>                                                 <C>                   <C>                  <C>
Portfolio turnover rate                                          %            184.3%              206.1%
</TABLE>


----------
(a)  Total return is not annualized.
(b)  After the reimbursement and waiver of expenses by CAM equivalent to___%,
     0.3%, and 0.3%* of average net assets, respectively.
*Annualized





<PAGE>   9



Global Convertible Fund

<TABLE>
<CAPTION>

                                                      Year Ended           Year Ended            9/18/97 -
                                                        3/31/00              3/31/99              3/31/98
                                                    ----------------     ----------------     ----------------

<S>                                                 <C>                  <C>                  <C>
Net asset value, beginning of period                $                         $6.56               $ 6.18

Net income from investment operations:
   Net investment income                                                       .03                   .07
   Net realized and unrealized gain on investments                             .31                   .58
     Total from investment operations                                          .34                   .65

Less distributions:
   Dividends from net investment income                                       (.14)                (.17)
   Dividends from net realized capital gains                                  (.13)                (.10)
     Total distributions                                                      (.27)                (.27)

Net asset value, end of period                      $                         $6.63               $ 6.56

Total return (a)                                                  %           5.6%                 10.9%

Ratios and supplemental data:
   Net assets, end of period (000)                  $                         $484                 $ 458
   Ratio of expenses to average net assets                        %          1.5%(b)            1.5%*(b)
   Ratio of net investment income to average net                  %          1.8%(b)            1.9%*(b)
assets


                                                                             Year Ended            9/18/97 -
                                                        3/31/00               3/31/99              3/31/98
                                                    -----------------     -----------------     -----------------
Portfolio turnover rate                                            %          106.3%                   64%


</TABLE>

----------

(a)  Total return is not annualized.
(b)  After reimbursement and waiver of expenses by CAM equivalent to ___%, .9%
     and 1.2%*, respectively of average net assets.
*Annualized



<PAGE>   10



SPECIAL FEATURES OF INSTITUTIONAL SHARES

OFFERING PRICE


Institutional Shares of each Fund are sold without any sales charge. When
placing an order, you must specify that your order is for Institutional Shares.


PURCHASES BY EXCHANGE


No sales charge is imposed on purchases of Institutional Shares by exchange of
Institutional Shares from another Fund or by exchange of Cash Account Shares,
provided the aggregate value of your Institutional Shares of all Funds is at
least $5 million; unless the $5 million minimum does not apply, as discussed
above. Exchanges are subject to the limitations set forth in the prospectus
under "Transaction Information."


REDEMPTION OF SHARES


Each Fund reserves the right upon 30 days' written notice to involuntarily
redeem, at net asset value, the shares of any shareholder whose Institutional
Class Shares of all Funds have an aggregate value of less than $5 million,
unless the reduction in value to less than $5 million was the result of market
fluctuation. For further information on the redemption of shares, please refer
to the information in the prospectus under "How Can I Sell Shares?"



                                       4
<PAGE>   11

                                 [CALAMOS ICON]

                           CALAMOS(R) FAMILY OF FUNDS

                         AUGUST 1, 2000   - PROSPECTUS


                                     CONVERTIBLE FUND

                                     CONVERTIBLE GROWTH AND INCOME FUND*


                                     MARKET NEUTRAL FUND

                                     GROWTH FUND

                                     GLOBAL CONVERTIBLE FUND**

                                     HIGH YIELD FUND

                                     GLOBAL CONVERTIBLE TECHNOLOGY FUND


                                      *Formerly named Growth and Income Fund


                                     **Formerly named Global Growth and Income
                                     Fund


The Securities and Exchange Commission has not approved or disapproved these
securities or determined whether this prospectus is accurate or complete. If
anyone tells you otherwise, they are committing a crime.
<PAGE>   12

                                                                [THE FUNDS ICON]
                                                         [CONVERTIBLE FUND ICON]
                                       [CONVERTIBLE GROWTH AND INCOME FUND ICON]
                                                      [MARKET NEUTRAL FUND ICON]
                                                              [GROWTH FUND ICON]
                                                  [GLOBAL CONVERTIBLE FUND ICON]
                                                          [HIGH YIELD FUND ICON]
                                       [GLOBAL CONVERTIBLE TECHNOLOGY FUND ICON]
                                                               [FUND FACTS ICON]
                                                     [FINANCIAL HIGHLIGHTS ICON]
                                                     [FOR MORE INFORMATION ICON]

Table of Contents


<TABLE>
<CAPTION>
                                                             PAGE
<S>                                                           <C>

THE FUNDS                                                       3
-----------------------------------------------------------------

CONVERTIBLE FUND                                                4
-----------------------------------------------------------------

CONVERTIBLE GROWTH AND INCOME FUND                             14
-----------------------------------------------------------------

MARKET NEUTRAL FUND                                            23
-----------------------------------------------------------------

GROWTH FUND                                                    32
-----------------------------------------------------------------

GLOBAL CONVERTIBLE FUND                                        38
-----------------------------------------------------------------

HIGH YIELD FUND                                                48
-----------------------------------------------------------------

GLOBAL CONVERTIBLE TECHNOLOGY FUND                             55
-----------------------------------------------------------------

FUND FACTS
-----------------------------------------------------------------
Who Manages the Funds?......................................   63
How Can I Buy Shares?.......................................   65
How Can I Sell Shares?......................................   69
Transaction Information.....................................   71
Distributions and Taxes.....................................   73

FINANCIAL HIGHLIGHTS                                           75
-----------------------------------------------------------------

FOR MORE INFORMATION                                         back
cover
-----------------------------------------------------------------
</TABLE>


CALAMOS FAMILY OF FUNDS
<PAGE>   13

In this column, you will find definitions of terms and concepts to help you as
you read this prospectus.
CONVERTIBLE SECURITY -- corporate security (usually a preferred stock or bond)
that is exchangeable at the option of the holder for a fixed number of other
securities (usually common stock) at a set price or formula.

<TABLE>
<S>          <C>
[THE         The Funds
    FUNDS
    ICON]
</TABLE>

WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES COMMON TO THE FUNDS?

Each Fund described in this prospectus has different investment objectives and
strategies, and may invest in different securities. The Funds differ principally
in (i) how important growth potential and current income is considered when
selecting investments, (ii) the types of securities selected as investments,
such as convertible securities, or equities, or foreign securities, and (iii)
the risks involved with an investment in the Fund.

The investment objectives of a Fund may not be changed without the approval of a
"majority of the outstanding" shares of that Fund, as defined in the Investment
Company Act of 1940. There can be no assurance that a Fund will achieve its
objectives.

WHAT ARE THE PRINCIPAL RISKS COMMON TO THE FUNDS?

A WORD ABOUT RISK.  This prospectus describes the risks you may face as an
investor in the CALAMOS Family of Funds. It is important to keep in mind that
generally investments with a higher potential reward also have a higher risk of
losing money. The reverse is also commonly true: the lower the risk, the lower
the potential reward. However, as you consider an investment in the Funds, you
should also take into account your tolerance for the daily fluctuations of the
financial markets and whether you can afford to leave your money in this
investment for long periods of time to ride out down periods.

As with any security, there are market and investment risks associated with your
investment in the Funds. The value of your investment will fluctuate over time
and it is possible to lose money. We cannot guarantee that a Fund will achieve
its objective.

MARKET RISK.  The risk that the securities markets will increase or decrease in
value is considered market risk and applies to any security. If there is a
general decline in the stock market, it is possible your investment may lose
value regardless of the individual results of the companies in which a Fund
invests.

INVESTMENT MANAGEMENT.  Whether a Fund achieves its investment objective is
significantly impacted by whether we at CALAMOS(R) ASSET MANAGEMENT, INC., as
each Fund's investment adviser, are able to choose suitable investments for the
Funds.

CALAMOS FAMILY OF FUNDS                                                        3
<PAGE>   14

CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.

<TABLE>
<S>          <C>
[CONVERTIBLE Convertible Fund
      FUNDS
      ICON]
</TABLE>

WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?

The primary objective of the Convertible Fund is current income with growth as
its secondary objective.

The Fund invests mainly in a diversified portfolio of convertible securities
issued by both U.S. and foreign companies. These convertible securities may be
either debt securities or preferred stocks that can be exchanged for common
stock. Under normal market conditions, we invest at least 65% of the Fund's
total assets in convertible securities.


We believe there are various advantages to buying convertible securities,
including:


      - the potential for capital appreciation if the value of the underlying
        common stock increases

      - the relatively high yield received from dividend or interest payments as
        compared to common stock dividends

      - the relatively lower price volatility as compared to common stock

The Fund seeks to profit from this strategy by receiving interest on the
convertible security and through an increase in the convertible's value. The
convertible's value goes up when the market value of the underlying common stock
increases above the conversion price.

We typically apply a four-step approach when buying and selling convertible
securities for the Fund, which includes:

      1. Evaluating the default risk of the convertible security using
         traditional credit analysis

      2. Analyzing the convertible's underlying common stock to determine its
         capital appreciation potential

      3. Assessing the risk/return potential of the convertible security

      4. Evaluating the convertible security's impact on the overall composition
         of the Fund and it's diversification strategy

 4
CALAMOS CONVERTIBLE FUND
<PAGE>   15

                                                                Convertible Fund
                                                                          [ICON]

DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.

In the equity and credit analysis, we generally consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management

The Fund may invest without limit in high yield fixed-income securities (often
referred to as "junk bonds"). The average term to maturity of the Fund's fixed
income securities will typically range from five to ten years. The Fund may
invest up to 25% of its net assets in foreign securities. The Fund's assets may
also be invested in securities that have not been registered for public sale,
but that are eligible for purchase and sale by certain qualified institutional
buyers (Rule 144A securities).

WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

CONVERTIBLE SECURITIES.  Convertible securities include debt obligations and
preferred stock of the company issuing the security, which may be exchanged for
a predetermined price (the conversion price) into the common stock of the
issuer. Convertible securities generally offer lower interest or dividend yields
than non-convertible securities of similar quality.

Many convertible securities are issued with a "call" feature that allows the
issuer of the security to choose when to redeem the security. If a convertible
security held by the Fund is called for redemption, the Fund will be required to
redeem the security, convert it into the underlying common stock, or sell it to
a third party at a time that may be unfavorable to the Fund. Conversely, certain
convertible debt securities may provide a "put option" which entitles the Fund
to make the issuer redeem the security at a premium over the stated principal
amount of the debt security.

SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible component"). The fixed-income component is achieved by investing
in non-convertible, fixed-income securities such as bonds, preferred stocks and
money market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index.

CALAMOS CONVERTIBLE FUND                                                       5
<PAGE>   16

Convertible Fund
[ICON]

The Fund may also purchase synthetic securities created by other parties,
typically investment banks, including convertible structured notes. Purchasing
synthetic convertible securities may offer more flexibility than purchasing a
convertible security. Different companies may issue the fixed-income and
convertible components which may be purchased separately, and at different
times. Synthetic convertible securities that are created by the investment
manager are not considered convertible securities for purposes of the Fund's
policy to invest at least 65% of its total assets in convertible securities.


FOREIGN SECURITIES.  We may invest up to 25% of the Fund's net assets in
securities of foreign issuers. A foreign issuer is a company organized under the
laws of a foreign country that is principally traded in the financial markets of
a foreign country. For purposes of the 25% limitation, foreign securities do not
include securities represented by American Depository Receipts (ADRs) or
securities guaranteed by a U.S. person. ADRs are traded on U.S. exchanges and
represent an ownership interest in a foreign security. They are generally issued
by a U.S. bank as a substitute for direct ownership of the foreign security.
International investing allows the Fund to achieve greater diversification and
to take advantage of changes in foreign economies and market conditions.

EQUITY SECURITIES.  Equity securities include exchange-traded and over-the-
counter common and preferred stocks, warrants, rights, and depository receipts.
An investment in the equity securities of a company represents a proportionate
ownership interest in that company. Therefore, the Fund participates in the
financial success or failure of any company in which we have an equity interest.
Compared with other asset classes, equity investments have a greater potential
for gain.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund may invest without
limit in convertible and non-convertible debt securities rated BB or lower by
Standard & Poor's Corporation, or Ba or lower by Moody's Investor Services,
Inc., and in securities that are not rated but are considered by us to be of
similar quality (commonly called "junk" bonds). The Fund will not, however,
acquire a security rated below C and expects to maintain, over the long-term, an
average credit quality rating of investment grade, which is BBB or Baa or
greater.

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or

 6
CALAMOS CONVERTIBLE FUND
<PAGE>   17
                                                                Convertible Fund
                                                                          [ICON]

securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.

OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.

CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying common stock falls below the conversion price of the security.

CALAMOS CONVERTIBLE FUND                                                       7
<PAGE>   18

Convertible Fund
[ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.

FOREIGN SECURITIES.  There are special risks associated with investing in
foreign securities that are not typically associated with investing in U.S.
companies. These risks include fluctuations in the exchange rates of foreign
currencies that may affect the U.S. dollar value of a security, and the
possibility of substantial price volatility as a result of political and
economic instability in the foreign country. Other risks of investing in foreign
securities include: less public information about issuers of securities,
different securities regulation, different accounting, auditing and financial
reporting standards, and less liquidity in foreign markets than in U.S. markets.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
we will determine whether securities purchased under Rule 144A are illiquid. The
Fund is restricted to investing no more than 10% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund's investment in junk
bonds entails a greater risk than an investment in higher-rated securities.
Although junk bonds typically pay higher interest rates than investment-grade
bonds, there is a greater likelihood that the company issuing the junk bond will
default on interest and principal payments. In the event of an issuer's
bankruptcy, claims of other creditors may have priority over the claims of junk
bond holders, leaving few or no assets to repay them. Junk bonds are also more
sensitive to adverse economic changes or individual corporate developments than
higher quality bonds. During a period of adverse economic changes, including a
period of rising interest rates, companies issuing junk bonds may be unable to
make principal and interest payments.

 8
CALAMOS CONVERTIBLE FUND
<PAGE>   19

                                                                Convertible Fund
                                                                          [ICON]

EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

EQUITY INVESTMENTS.  Equity investments are subject to greater fluctuations in
market value than other asset classes as a result of such factors as a company's
business performance, investor perceptions, stock market trends and general
economic conditions. Smaller companies are especially sensitive to these
factors, and therefore may experience more price volatility than larger
companies.

SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component
falls below the exercise price of the warrant or option, the warrant or option
may lose all value.

CALAMOS CONVERTIBLE FUND                                                       9
<PAGE>   20
Convertible Fund
[ICON]

TOTAL RETURN -- the return on an investment including income from dividends and
interest as well as appreciation or depreciation in the price of the security
over a given time period.

HOW HAS THE FUND PERFORMED IN THE PAST?

The bar chart and table below provide some indication of the risks of investing
in the Fund by showing changes in the Fund's performance from calendar year to
calendar year and how the Fund's average annual total returns compare with those
of a broad measure of market performance. As always, please note that how the
Fund has performed in the past cannot predict how it will perform in the future.
The information provided in the chart is for Class A shares, and does not
reflect sales charges, which reduce return.

CALENDAR YEAR PERFORMANCE
[CALAMOS CONVERTIBLE FUND BAR CHART]

<TABLE>
<CAPTION>
                                                                      CALAMOS CONVERTIBLE FUND %
                                                                      --------------------------
<S>                                                           <C>
1990                                                                             -3.56
1991                                                                             36.75
1992                                                                              7.62
1993                                                                             17.55
1994                                                                             -7.04
1995                                                                             29.25
1996                                                                             16.70
1997                                                                             20.81
1998                                                                             11.64
1999                                                                              0.00
</TABLE>


For the period included in the bar chart, the Fund's highest return for a
calendar quarter was [15.67% (the 1st quarter of 1991)], and the Fund's lowest
return for a calendar quarter was -10.10% (the 3rd quarter of 1990).



The Fund's year-to-date total return as of June 30, 2000 was

---%.

 10
CALAMOS CONVERTIBLE FUND
<PAGE>   21
                                                                Convertible Fund
                                                                          [ICON]

AVERAGE ANNUAL TOTAL RETURNS

For periods ended December 31, 1999



<TABLE>
<CAPTION>
                                                                       SINCE CLASS C
                       ONE YEAR       FIVE YEARS       TEN YEARS         INCEPTION*
-------------------------------------------------------------------------------------
<S>                    <C>            <C>              <C>             <C>
 CLASS A                      %              %                %                --
-------------------------------------------------------------------------------------
 CLASS B( 7/8)               --             --               --                --
-------------------------------------------------------------------------------------
 CLASS C                      %             --               --                 %
-------------------------------------------------------------------------------------
 VALUE LINE
 CONVERTIBLE INDEX#           %              %                %                --
-------------------------------------------------------------------------------------
</TABLE>


*  Inception Date for C shares is 7/5/96.


( 7/8) Because this is a new share class, it did not have performance to report
       as of the date of this prospectus.


#  The Value Line Convertible Index is an unmanaged index considered
   representative of the convertible securities market. The index includes 585
   convertible bonds and preferred stocks. Selection is based on issue size and
   trading statistics. Index returns assume reinvestment of dividends and,
   unlike Fund returns, do not reflect any fees, expenses or sales charges.

CALAMOS CONVERTIBLE FUND                                                      11
<PAGE>   22
Convertible Fund
[ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.

DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
         SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
                      YOUR INVESTMENT)                          CLASS A      CLASS B    CLASS C
-----------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>        <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE       NONE
-----------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%      1.00%
-----------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED ON
 REINVESTED DIVIDENDS/DISTRIBUTIONS                               NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
(1)  The redemption of Class A shares purchased at net asset value under the $1,000,000
     purchase order privilege may be subject to a contingent deferred sales charge of 1% if
     redeemed within one year of purchase and .50% if redeemed during the second year following
     purchase.
(2)  A service charge of $9 is deducted from proceeds of redemption paid by wire.
-----------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
-----------------------------------------------------------------------------------------------
 MANAGEMENT FEES                                                     %            %          %
-----------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1)FEES*                                        .25%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                    %            %          %
-----------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES                                     %            %          %
-----------------------------------------------------------------------------------------------
</TABLE>



 * Effective April 1, 2000, the distribution and service (12b-1) fee rate for
   Class A shares of the Fund was reduced from .50% to .25% of average net
   assets.



** "Other Expenses" for Class B shares are based on estimated amounts for the
   current fiscal year. Class B shares are expected to commence operations on or
   about August 1, 2000.


 12
CALAMOS CONVERTIBLE FUND
<PAGE>   23
                                                                Convertible Fund
                                                                          [ICON]

EXAMPLES:


Based on the figures above, these examples are intended to help you compare the
cost of investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $                $               $                $
-----------------------------------------------------------------------------------
 CLASS B                 $                $                   --               --
-----------------------------------------------------------------------------------
 CLASS C                 $                $               $                $
-----------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $                $               $                $
-----------------------------------------------------------------------------------
 CLASS B                 $                $                   --               --
-----------------------------------------------------------------------------------
 CLASS C                 $                $               $                $
-----------------------------------------------------------------------------------
</TABLE>


CALAMOS CONVERTIBLE FUND                                                      13
<PAGE>   24

CONVERTIBLE SECURITY --
corporate security (usually a preferred stock or bond) that is exchangeable at
the option of the holder for a fixed number of other securities (usually common
stock) at a set price or formula.
CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.


<TABLE>
<S>          <C>
[GROWTH      Convertible Growth and
      AND    Income Fund
   INCOME    (formerly named Growth
    ICON]    and Income Fund)
</TABLE>


WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?


The primary objective of the Convertible Growth and Income Fund is high
long-term total return through growth and current income. The Fund invests
primarily in a diversified portfolio of convertible, equity and fixed-income
securities, with equal emphasis on capital appreciation and current income.



Under normal market conditions we invest at least 65% of the Fund's total assets
in convertible securities. These convertible securities may be either debt
securities or preferred stocks that can be exchanged for common stock.



We believe there are various advantages to buying convertible securities,
including:


      - the potential for capital appreciation if the value of the
        underlying common stock increases

      - the relatively high yield received from dividend or interest
        payments as compared to common stock dividends

      - the relatively lower price volatility as compared to common stock

The Fund seeks to profit from this strategy by receiving interest on the
convertible security and through an increase in the convertible's value. The
convertible's value goes up when the market value of the underlying common stock
increases above the conversion price.

We typically apply a four-step approach when buying and selling convertible
securities for the Fund, which includes:

      1. Evaluating the default risk of the convertible security using
         traditional credit analysis

      2. Analyzing the convertible's underlying common stock to determine
         its capital appreciation potential

      3. Assessing the risk/return potential of the convertible security

      4. Evaluating the convertible security's impact on the overall
         composition of the Fund and it's diversification strategy


 14

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND
<PAGE>   25
      Convertible Growth and Income Fund (formerly named Growth and Income Fund)
                                                                          [ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.
DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.

In the equity and credit analysis, we generally consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management

The Fund's assets not invested in convertible securities are invested in common
stocks that, in our judgment, provide opportunities for long-term capital
appreciation, or in other securities as described below. The Fund generally
invests in smaller and medium-sized companies, the securities of which tend to
be more volatile and less liquid than the securities of larger companies.

The Fund may invest without limit in high yield fixed-income securities (often
referred to as "junk bonds"). The average term to maturity of the Fund's fixed-
income securities will typically range from five to ten years. The Fund's assets
may also be invested in securities that have not been registered for public
sale, but that are eligible for purchase and sale by certain qualified
institutional buyers (Rule 144A securities).

WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

CONVERTIBLE SECURITIES.  We expect that a significant portion of the Fund's
assets will be invested in convertible securities. Convertible securities
include debt obligations and preferred stock of the company issuing the
security, which may be exchanged for a predetermined price (the conversion
price) into the common stock of the issuer. Convertible securities generally
offer lower interest or dividend yields than non-convertible securities of
similar quality.

Many convertible securities are issued with a "call" feature that allows the
issuer of the security to choose when to redeem the security. If a convertible
security held by the Fund is called for redemption, the Fund will be required to
redeem the security, convert it into the underlying common stock, or sell it to
a third party at a time that may be unfavorable to the Fund. Conversely, certain
convertible debt securities may provide a "put option" which entitles the Fund
to make the issuer redeem the security at a premium over the stated principal
amount of the debt security.

SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND                                    15

<PAGE>   26
Convertible Growth and Income Fund (formerly named Growth and Income Fund)
[ICON]

component"). The fixed-income component is achieved by investing in non-
convertible, fixed-income securities such as bonds, preferred stocks and money
market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index.


The Fund may also purchase synthetic securities created by other parties,
typically investment banks, including convertible structured notes. Purchasing
synthetic convertible securities may offer more flexibility than purchasing a
convertible security. Different companies may issue the fixed-income and
convertible components which may be purchased separately, and at different
times. Synthetic convertible securities that are created by the investment
manager are not considered convertible securities for purposes of the Fund's
policy to invest at least 65% of its total assets in convertible securities.


EQUITY SECURITIES.  Equity securities include exchange-traded and over-the-
counter common and preferred stocks, warrants, rights, and depository receipts.
An investment in the equity securities of a company represents a proportionate
ownership interest in that company. Therefore, the Fund participates in the
financial success or failure of any company in which we have an equity interest.
Compared with other asset classes, equity investments have a greater potential
for gain.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund may invest without
limit in convertible and non-convertible debt securities rated BB or lower by
Standard & Poor's Corporation, or Ba or lower by Moody's Investor Services,
Inc., and in securities that are not rated but are considered by us to be of
similar quality (commonly called "junk" bonds). The Fund will not, however,
acquire a security rated below C.

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.

OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may


 16

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND
<PAGE>   27
      Convertible Growth and Income Fund (formerly named Growth and Income Fund)
                                                                          [ICON]

impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.

CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying stock falls below the conversion price of the security.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.


CALAMOS CONVERTIBLE GROWTH AND INCOME FUND                                    17

<PAGE>   28

Convertible Growth and Income Fund (formerly named Growth and Income Fund)
[ICON]

EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

EQUITY INVESTMENTS.  Equity investments are subject to greater fluctuations in
market value than other asset classes as a result of such factors as a company's
business performance, investor perceptions, stock market trends and general
economic conditions.

SMALL COMPANY RISK.  Small company stocks have historically been subject to
greater investment risk than large company stocks. The risks generally
associated with small companies include more limited product lines, markets and
financial resources, lack of management depth or experience, dependency on key
personnel and vulnerability to adverse market and economic developments.
Accordingly, the prices of small company stocks tend to be more volatile than
prices of large company stocks. Further, the prices of small company stocks are
often adversely affected by limited trading volumes and the lack of publicly
available information.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
we will determine whether securities purchased under Rule 144A are illiquid. The
Fund is restricted to investing no more than 10% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund's investment in junk
bonds entails a greater risk than an investment in higher-rated securities.
Although junk bonds typically pay higher interest rates than investment-grade
bonds, there is a greater likelihood that the company issuing the junk bond will
default on interest and principal payments. In the event of an issuer's
bankruptcy, claims of other creditors may have priority over the claims of junk
bond holders, leaving few or no assets to repay them. Junk bonds are also more
sensitive to adverse economic changes or individual corporate developments than
higher quality bonds. During a period of adverse economic changes, including a
period of rising interest rates, companies issuing junk bonds may be unable to
make principal and interest payments.

SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component


 18

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND
<PAGE>   29
      Convertible Growth and Income Fund (formerly named Growth and Income Fund)
                                                                          [ICON]

falls below the exercise price of the warrant or option, the warrant or option
may lose all value.

HOW HAS THE FUND PERFORMED IN THE PAST?

The bar chart and table below provide some indication of the risks of investing
in the Fund by showing changes in the Fund's performance from calendar year to
calendar year and how the Fund's average annual total returns compare with those
of a broad measure of market performance. As always, please note that how the
Fund has performed in the past cannot predict how it will perform in the future.
The information provided in the chart is for Class A shares, and does not
reflect sales charges, which reduce return.

CALENDAR YEAR PERFORMANCE
[CALAMOS GROWTH & COME FUND BAR CHART]

<TABLE>
<CAPTION>
                                                                    CALAMOS GROWTH & INCOME FUND %
                                                                    ------------------------------
<S>                                                           <C>
1990                                                                             -3.46
1991                                                                             40.67
1992                                                                             10.12
1993                                                                             14.79
1994                                                                             -5.31
1995                                                                             29.14
1996                                                                             19.22
1997                                                                             23.34
1998                                                                             17.62
1999                                                                              0.00
</TABLE>


For the period included in the bar chart, the Fund's highest return for a
calendar quarter was [14.70% (the 1st quarter of 1991)], and the Fund's lowest
return for a calendar quarter was -12.15% (the 3rd quarter of 1990).



The Fund's year-to-date total return as of June 30, 2000 was

---%.


CALAMOS CONVERTIBLE GROWTH AND INCOME FUND                                    19

<PAGE>   30
Convertible Growth and Income Fund (formerly named Growth and Income Fund)
[ICON]

TOTAL RETURN -- the return on an investment including income from dividends and
interest as well as appreciation or depreciation in the price of the security
over a given time period.

AVERAGE ANNUAL TOTAL RETURNS

For periods ended December 31, 1999



<TABLE>
<CAPTION>
                                                                       SINCE CLASS C
                       ONE YEAR       FIVE YEARS       TEN YEARS         INCEPTION*
-------------------------------------------------------------------------------------
<S>                    <C>            <C>              <C>             <C>
 CLASS A                      %               %               %               --
-------------------------------------------------------------------------------------
 CLASS B( 7/8)              --              --              --                --
-------------------------------------------------------------------------------------
 CLASS C                      %             --              --                  %
-------------------------------------------------------------------------------------
 VALUE LINE
 CONVERTIBLE INDEX#          %                %               %               --
-------------------------------------------------------------------------------------
</TABLE>


* Inception Date for Class C shares is 8/5/96.

( 7/8) Because this is a new share class, it did not have performance to report
       as of the date of this prospectus.

# The Value Line Convertible Index is an unmanaged index considered
  representative of the convertible securities market. The index includes 585
  convertible bonds and preferred stocks. Selection is based on issue size and
  trading statistics. Index returns assume reinvestment of dividends and, unlike
  Fund returns, do not reflect any fees, expenses or sales charges.


 20

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND
<PAGE>   31
      Convertible Growth and Income Fund (formerly named Growth and Income Fund)
                                                                          [ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
         SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
                     YOUR INVESTMENT):                          CLASS A      CLASS B         CLASS C
----------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>             <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE            NONE
----------------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%           1.00%
----------------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED ON
 REINVESTED DIVIDENDS/DISTRIBUTIONS                               NONE         NONE            NONE
----------------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%           1.00%
----------------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE            NONE
----------------------------------------------------------------------------------------------------
</TABLE>



(1)  The redemption of Class A shares purchased at net asset value under the
     $1,000,000 purchase order privilege may be subject to a contingent deferred
     sales charge of 1% if redeemed within one year of purchase and .50% if
     redeemed during the second year following purchase.


(2)  A service charge of $9 is deducted from proceeds of redemption paid by
    wire.

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

<TABLE>
<S>                                                             <C>          <C>             <C>
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
----------------------------------------------------------------------------------------------------
 Management Fees                                                  .75%         .75%            .75%
----------------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES*                                       .25%        1.00%           1.00%
----------------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                    %            %               %
----------------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES                                     %            %               %
----------------------------------------------------------------------------------------------------
</TABLE>



 * Effective April 1, 2000, the distribution and service (12b-1) fee rate for
   Class A shares of the Fund was reduced from .50% to .25% of average net
   assets.



** "Other Expenses" for Class B shares are based on estimated amounts for the
   current fiscal year. Class B shares are expected to commence operations on or
   about August 1, 2000.


CALAMOS CONVERTIBLE GROWTH AND INCOME FUND                                    21
<PAGE>   32
Convertible Growth and Income Fund (formerly named Growth and Income Fund)
[ICON]

EXAMPLES:


Based on the figures above, these examples are intended to help you compare the
cost of investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $               $                $                $
-----------------------------------------------------------------------------------
 CLASS B                 $               $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                 $               $                $                $
-----------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $               $                $                $
-----------------------------------------------------------------------------------
 CLASS B                 $               $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                 $               $                $                $
-----------------------------------------------------------------------------------
</TABLE>



 22

CALAMOS CONVERTIBLE GROWTH AND INCOME FUND
<PAGE>   33

CONVERTIBLE SECURITY --
corporate security (usually a preferred stock or bond) that is exchangeable at
the option of the holder for a fixed number of other securities (usually common
stock) at a set price or formula.
CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.


<TABLE>
<S>          <C>
[MARKET      Market Neutral Fund
  NEUTRAL
     FUND
    ICON]
</TABLE>


WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?

The primary objective of the Market Neutral Fund is high current income
consistent with stability of principal.

The Fund invests mainly in convertible securities and employs short selling to
enhance income and hedge against market risk. These convertible securities may
be either debt securities or preferred stocks that can be exchanged for common
stock. Under normal market conditions, we invest at least 65% of the Fund's
total assets in income-producing securities.


We believe there are various advantages to buying convertible securities,
including:


      - the potential for capital appreciation if the value of the underlying
        common stock increases

      - the relatively high yield received from dividend or interest payments as
        compared to common stock dividends

      - the relatively lower price volatility as compared to common stock

We typically apply a four-step approach when buying and selling convertible
securities for the Fund, which includes:

      1. Evaluating the default risk of the convertible security using
         traditional credit analysis

      2. Analyzing the convertible's underlying common stock to determine its
         capital appreciation potential

      3. Assessing the risk/return potential of the convertible security

      4. Evaluating the convertible security's impact on the overall composition
         of the Fund and it's diversification strategy

In the equity and credit analysis, we generally consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management

CALAMOS MARKET NEUTRAL FUND                                                   23
<PAGE>   34


Market Neutral Fund
[ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.


The Fund seeks to enhance income and protect against market risk by hedging a
portion of the equity risk inherent in the convertible securities purchased for
the Fund. This hedging is achieved by selling short some or all of the common
stock issuable upon exercise of the convertible security. In a short sale, the
Fund borrows securities from a broker and sells the borrowed securities. The
proceeds of the sale are generally used to secure the Fund's obligation to the
lending broker and are invested in liquid securities. We anticipate that, from
time to time, approximately 30% to 70% of the Fund's net assets will be employed
for short sales.

If the market price of the common stock increases above the conversion price on
the convertible security, the price of the convertible security will increase.
The Fund's increased liability on the short position would, in whole or in part,
reduce this gain. If the price of the common stock declines, any decline in the
price of the convertible security would offset the Fund's gain on the short
position. The Fund profits from this strategy by receiving interest and/or
dividends on the convertible security and by adjusting the amount of equity risk
that is hedged by short sales.

In determining the appropriate portion of the Fund's equity exposure to hedge,
we may consider:

      - the general outlook for interest rates and equity markets

      - the availability of stock to sell short

      - expected returns and volatility

The Fund may invest without limit in high yield fixed-income securities (often
referred to as "junk bonds"). The average term to maturity of the Fund's fixed
income securities will typically range from five to ten years. The Fund's assets
may also be invested in securities that have not been registered for public
sale, but that are eligible for purchase and sale by certain qualified
institutional buyers (Rule 144A Securities).

Because the Fund may engage in active and frequent trading of portfolio
securities, the Fund may have higher transaction costs which would affect the
Fund's performance over time. In addition, shareholders may incur taxes on any
realized capital gains.

 24
CALAMOS MARKET NEUTRAL FUND
<PAGE>   35


                                                             Market Neutral Fund
                                                                          [ICON]

DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.


WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

CONVERTIBLE SECURITIES.  Convertible securities include debt obligations and
preferred stock of the company issuing the security, which may be exchanged for
a predetermined price (the conversion price) into the common stock of the
issuer. Convertible securities generally offer lower interest or dividend yields
than non-convertible securities of similar quality.

Many convertible securities are issued with a "call" feature that allows the
issuer of the security to choose when to redeem the security. If a convertible
security held by the Fund is called for redemption, the Fund will be required to
redeem the security, convert it into the underlying common stock, or sell it to
a third party at a time that may be unfavorable to the Fund. Conversely, certain
convertible debt securities may provide a "put option" which entitles the Fund
to make the issuer redeem the security at a premium over the stated principal
amount of the debt security.

SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible component"). The fixed-income component is achieved by investing
in non-convertible, fixed-income securities such as bonds, preferred stocks and
money market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index.


The Fund may also purchase synthetic securities created by other parties,
typically investment banks, including convertible structured notes. Purchasing
synthetic convertible securities may offer more flexibility than purchasing a
convertible security. Different companies may issue the fixed-income and
convertible components which may be purchased separately, and at different
times.


HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund may invest without
limit in convertible and non-convertible debt securities rated BB or lower by
Standard & Poor's Corporation, or Ba or lower by Moody's Investor Services,
Inc., and in securities that are not rated but are considered by us to be of
similar quality (commonly called "junk" bonds). The Fund will not, however,
acquire a security rated below C.

CALAMOS MARKET NEUTRAL FUND                                                   25
<PAGE>   36

Market Neutral Fund
[ICON]

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.


OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

SHORT SALES.  Short sales are a key component of the Fund's strategy. Short
sales involve risks, including:

      - The Fund may incur a loss as a result of a short sale if the
        market value of the borrowed security increases between the date
        of the short sale and the date the Fund replaces the security.

      - The Fund may be unable to repurchase the borrowed security at a
        particular time or at an acceptable price. When the Fund is short
        a security, the lender may terminate the loan at a time when the
        Fund is unable to borrow the same security from another lender.
        When this happens the Fund is required to close out its short
        position at the current market price.

      - Although the Fund's gain is limited to the amount received upon
        selling a security short, its potential loss is unlimited.

      - The Fund might be unable to implement these strategies because of
        the lack of attractive short sale opportunities.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.
 26
CALAMOS MARKET NEUTRAL FUND
<PAGE>   37

                                                             Market Neutral Fund
                                                                          [ICON]

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.


CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying common stock falls below the conversion price of the security.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund's investment in junk
bonds entails a greater risk than an investment in higher-rated securities.
Although junk bonds typically pay higher interest rates than investment-grade
bonds, there is a greater likelihood that the company issuing the junk bond will
default on interest and principal payments. In the event of an issuer's
bankruptcy, claims of other creditors may have priority over the claims of junk
bond holders, leaving few or no assets to repay them. Junk bonds are also more
sensitive to adverse economic changes or individual corporate developments than
higher quality bonds. During a period of adverse economic changes, including a
period of rising interest rates, companies issuing junk bonds may be unable to
make principal and interest payments.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
we will determine whether securities purchased under Rule 144A are illiquid.
CALAMOS MARKET NEUTRAL FUND                                                   27
<PAGE>   38

Market Neutral Fund
[ICON]

The Fund is restricted to investing no more than 10% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.


SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component
falls below the exercise price of the warrant or option, the warrant or option
may lose all value.

HOW HAS THE FUND PERFORMED IN THE PAST?

The bar chart and table below provide some indication of the risks of investing
in the Fund by showing changes in the Fund's performance from calendar year to
calendar year and how the Fund's average annual total returns compare with those
of a broad measure of market performance. As always, please note that how the
Fund has performed in the past cannot predict how it will perform in the future.
The information provided in the chart is for Class A shares, and does not
reflect sales charges, which reduce return.

 28
CALAMOS MARKET NEUTRAL FUND
<PAGE>   39

                                                             Market Neutral Fund
                                                                          [ICON]

TOTAL RETURN -- the return on an investment including income from dividends and
interest as well as appreciation or depreciation in the price of the security
over a given time period.


CALENDAR YEAR PERFORMANCE
[Calamos Market Neutral Fund Bar Chart]

<TABLE>
<CAPTION>
                                                                     CALAMOS MARKET NEUTRAL FUND %
                                                                     -----------------------------
<S>                                                           <C>
1991                                                                             13.98
1992                                                                             11.97
1993                                                                             12.13
1994                                                                             -7.41
1995                                                                             14.46
1996                                                                              8.17
1997                                                                             14.00
1998                                                                             10.04
1999                                                                              0.00
</TABLE>


For the period included in the bar chart, the Fund's highest return for a
calendar quarter was [6.35% (the 1st quarter of 1991)], and the Fund's lowest
return for a calendar quarter was -4.47% (the 2nd quarter of 1994).



The Fund's year-to-date total return as of June 30, 2000 was --%.

AVERAGE ANNUAL TOTAL RETURNS

For periods ended December 31, 1999



<TABLE>
<CAPTION>
                                                                    SINCE CLASS A
                                    ONE YEAR       FIVE YEARS         INCEPTION*
----------------------------------------------------------------------------------
<S>                                 <C>            <C>              <C>
 CLASS A                                  %               %                   %
----------------------------------------------------------------------------------
 CLASS B( 7/8)                           --              --                 --
----------------------------------------------------------------------------------
 CLASS C( 7/8)( 7/8)                     --              --                 --
----------------------------------------------------------------------------------
 SALOMON BROTHERS 30 DAY TREASURY
 BILLS INDEX#                             %               %                   %**
----------------------------------------------------------------------------------
 LEHMAN BROTHERS GOVT /CORP. BOND
 INDEX#                                   %               %                   %**
----------------------------------------------------------------------------------
</TABLE>



* Inception date for A shares is 9/4/90.


** Index returns are from 9/1/90

#  The Salomon Brothers 30-Day Treasury Bills Index is an unmanaged index
   generally considered representative of the performance of short-term money
   investments. U.S. Treasury bills are backed by the full faith and credit of
   the U.S. Government and offer a guarantee as to the repayment of principal
   and interest at maturity. The Lehman Brothers Government/Corporate Bond Index
   is an unmanaged index comprising intermediate and long-term government and
   investment-grade corporate debt securities. Index returns assume reinvestment
   of dividends and, unlike Fund returns, do not reflect any fees, expenses or
   sales charges.


( 7/8)  Because this is a new share class, it did not have performance to report
        as of the date of this prospectus.



( 7/8)( 7/8) The inception date for C shares is 2/16/00, therefore, there is no
             performance to report for this share class.


CALAMOS MARKET NEUTRAL FUND                                                   29
<PAGE>   40
Market Neutral Fund
[ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?

The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.



<TABLE>
<CAPTION>
SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
YOUR INVESTMENT):                                               CLASS A      CLASS B         CLASS C
----------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>             <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE            NONE
----------------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                       NONE(1)       5.00%           1.00%
----------------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED ON
 REINVESTED DIVIDENDS/DISTRIBUTIONS                               NONE         NONE            NONE
----------------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%           1.00%
----------------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE            NONE
----------------------------------------------------------------------------------------------------
(1)  The redemption of Class A shares purchased at net asset value under the $1,000,000 purchase
     order privilege may be subject to a contingent deferred sales charge of 1% if redeemed within
     one year of purchase and .50% if redeemed during the second year following purchase.
(2)  A service charge of $9 is deducted from proceeds of redemption paid by wire.
----------------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
----------------------------------------------------------------------------------------------------
 MANAGEMENT FEES                                                  .75%         .75%            .75%
----------------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES*                                       .25%        1.00%            100%
----------------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                                 %**
----------------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES***                                  %            %               %
----------------------------------------------------------------------------------------------------
 FEE WAIVER AND/OR EXPENSE REIMBURSEMENT                             %            %               %
----------------------------------------------------------------------------------------------------
 NET EXPENSES                                                        %            %               %
----------------------------------------------------------------------------------------------------
</TABLE>



 *Effective April 1, 2000, the distribution and service (12b-1) fee rate for
  Class A shares of the Fund was reduced from .50% to .25% of average net
  assets.



 **"Other Expenses" for Class B and Class C shares are based on estimated
   amounts for the current fiscal year. Class C shares commenced operations on
   February 16, 2000, and Class B shares are expected to commence operations on
   or about August 1, 2000. "Other Expenses" include  % related to expenses
   incurred for dividends paid on short positions that are not subject to CAM's
   expense limitation.



*** Pursuant to a written agreement, CALAMOS ASSET MANAGEMENT, INC. ("CAM") has
    voluntarily decided to waive fees and/or reimburse fund expenses so that the
    Total Annual Operating Expenses are limited to 2.00% for Class A shares and
    2.50% for Class B and Class C shares. The fee waiver and/or reimbursement is
    binding on CAM through August 31, 2001.




 30
CALAMOS MARKET NEUTRAL FUND
<PAGE>   41

                                                             Market Neutral Fund
                                                                          [ICON]

EXAMPLES:



Based on the figures above (including one year of expenses capped by the
investment manager), these examples are intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                $                $                $                $
-----------------------------------------------------------------------------------
 CLASS B                $                $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                $                $                $                $
-----------------------------------------------------------------------------------
</TABLE>


You would pay the following expenses if you did not redeem your shares.


<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                $                $                $                $
-----------------------------------------------------------------------------------
 CLASS B                $                $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                $                $                $                $
-----------------------------------------------------------------------------------
</TABLE>


CALAMOS MARKET NEUTRAL FUND                                                   31
<PAGE>   42

CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.

EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

<TABLE>
<S>          <C>
[GROWTH      Growth Fund
     FUND
    ICON]
</TABLE>

WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?

The primary objective of the Growth Fund is long-term capital growth.

In pursuing the Fund's investment objective, we seek out securities that, in our
opinion, are undervalued and offer above-average potential for earnings growth.
The selection process emphasizes earnings growth potential coupled with
financial strength and stability. We anticipate that common stocks will
generally afford the best opportunity for capital growth.

The Fund's portfolio may include securities of well-established companies with
large market capitalizations as well as small, unseasoned companies. Although we
anticipate that the Fund will invest primarily in equity securities, the Fund
may invest in convertible securities, preferred stocks and obligations such as
bonds, debentures and notes that, in our opinion, present opportunities for
capital appreciation.

When buying and selling securities for the Fund, we focus on the issuer's
earnings growth potential coupled with financial strength and stability. We
perform our own fundamental analysis, in addition to depending upon recognized
rating agencies and other sources.

In our analysis, we typically consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management

Because the Fund may engage in active and frequent trading of portfolio
securities, the Fund may have higher transaction costs which would affect the
Fund's performance over time. In addition, shareholders may incur taxes on any
realized capital gains.

WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

EQUITY SECURITIES.  Equity securities include exchange-traded and over-the-
counter common and preferred stocks, warrants, rights, and depository receipts.
An investment in the equity securities of a company represents a proportionate
ownership interest in that company. Therefore, the Fund participates in the
financial success or failure of any company in which we have an equity interest.
Compared with other asset classes, equity investments have a greater potential
for gain.

 32
CALAMOS GROWTH FUND
<PAGE>   43
                                                                     Growth Fund
                                                                          [ICON]

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.

OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

EQUITY INVESTMENTS.  A substantial portion of the Fund's assets will be invested
in equity securities. Equity investments are subject to greater fluctuations in
market value than other asset classes as a result of such factors as a company's
business performance, investor perceptions, stock market trends and general
economic conditions.

SMALL COMPANY RISK.  Small company stocks have historically been subject to
greater investment risk than large company stocks. The risks generally
associated with small companies include more limited product lines, markets and
financial resources, lack of management depth or experience, dependency on key
personnel and vulnerability to adverse market and economic developments.
Accordingly, the prices of small company stocks tend to be more volatile than
prices of large company stocks. Further, the prices of small company stocks are
often adversely affected by limited trading volumes and the lack of publicly
available information.

CALAMOS GROWTH FUND                                                           33
<PAGE>   44
Growth Fund
[ICON]

HOW HAS THE FUND PERFORMED IN THE PAST?

The bar chart and table below provide some indication of the risks of investing
in the Fund by showing changes in the Fund's performance from calendar year to
calendar year and how the Fund's average annual total returns compare with those
of a broad measure of market performance. As always, please note that how the
Fund has performed in the past cannot predict how it will perform in the future.
The information provided in the chart is for Class A shares, and does not
reflect sales charges, which reduce return.

CALENDAR YEAR PERFORMANCE
[CALAMOS GROWTH FUND BAR CHART]

<TABLE>
<CAPTION>
                                                                         CALAMOS GROWTH FUND %
                                                                         ---------------------
<S>                                                           <C>
1991                                                                             40.21
1992                                                                              1.71
1993                                                                              4.36
1994                                                                             -5.71
1995                                                                             27.50
1996                                                                             37.91
1997                                                                             24.21
1998                                                                             27.31
1999                                                                              0.00
</TABLE>


For the period included in the bar chart, the Fund's highest return for a
calendar quarter was [31.28% (the 4th quarter of 1998)], and the Fund's lowest
return for a calendar quarter was -18.31% (the 3rd quarter of 1998).



The Fund's year-to-date total return as of June 30, 2000 was        %.


 34
CALAMOS GROWTH FUND
<PAGE>   45
                                                                     Growth Fund
                                                                          [ICON]

TOTAL RETURN -- the return on an investment including income from dividends and
interest as well as appreciation or depreciation in the price of the security
over a given time period.

AVERAGE ANNUAL TOTAL RETURNS

For periods ended December 31, 1999



<TABLE>
<CAPTION>
                                                       SINCE CLASS A       SINCE CLASS C
                       ONE YEAR       FIVE YEARS         INCEPTION*         INCEPTION**
-----------------------------------------------------------------------------------------
<S>                    <C>            <C>              <C>                 <C>
 CLASS A                    --%             --%               --%                 --
-----------------------------------------------------------------------------------------
 CLASS B( 7/8)              --              --                --                  --
-----------------------------------------------------------------------------------------
 CLASS C                    --%             --                --                  --%
-----------------------------------------------------------------------------------------
 S&P 500 INDEX#               %               %                 %***              --
-----------------------------------------------------------------------------------------
</TABLE>


*  Inception Date for Class A shares is 9/4/90.

** Inception Date for Class C shares is 9/3/96.

***Index returns for the life of Class A shares are from 9/1/90.

#   The S&P 500 Index is an unmanaged index generally considered representative
    of the U.S. stock market. Index returns assume reinvestment of dividends
    and, unlike Fund returns, do not reflect any fees, expenses or sales
    charges.

( 7/8)    Because this is a new share class, it did not have performance to
          report as of the date of this prospectus.


CALAMOS GROWTH FUND                                                           35
<PAGE>   46
Growth Fund
[ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
         SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
                     YOUR INVESTMENT):                          CLASS A      CLASS B    CLASS C
-----------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>        <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE       NONE
-----------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%      1.00%
-----------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED ON
 REINVESTED DIVIDENDS/DISTRIBUTIONS                               NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
(1) The redemption of Class A shares purchased at net asset value under the $1,000,000 purchase
    order privilege may be subject to a contingent deferred sales charge of 1% if redeemed
    within one year of purchase and .50% if redeemed during the second year following purchase.
(2) A service charge of $9 is deducted from proceeds of redemption paid by wire.
-----------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
-----------------------------------------------------------------------------------------------
 MANAGEMENT FEES                                                 1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES*                                       .25%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                    %            %          %
-----------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES***                                  %            %          %
-----------------------------------------------------------------------------------------------
 FEE WAIVER AND/OR REIMBURSEMENT                                     %            %          %
-----------------------------------------------------------------------------------------------
 NET EXPENSES                                                    2.00%        2.50%      2.50%
-----------------------------------------------------------------------------------------------
</TABLE>



*  Effective April 1, 2000, the distribution and service (12b-1) fee rate for
   Class A shares of the Fund was reduced from .50% to .25% of average net
   assets.



** "Other Expenses" for Class B shares are based on estimated amounts for the
   current fiscal year. Class B shares are expected to commence operations on or
   about August 1, 2000.



*** Pursuant to a written agreement, CALAMOS ASSET MANAGEMENT, INC. ("CAM") has
    voluntarily decided to waive fees and/or reimburse fund expenses so that the
    Total Annual Operating Expenses are limited to 2.00% for Class A shares and
    2.50% for Class B and Class C shares. The fee waiver and/or reimbursement is
    binding on CAM through August 31, 2001.


 36
CALAMOS GROWTH FUND
<PAGE>   47
                                                                     Growth Fund
                                                                          [ICON]

EXAMPLES:


Based on the figures above (including one year of expenses capped by the
investment manager), these examples are intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $               $                $                $
-----------------------------------------------------------------------------------
 CLASS B                 $               $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                 $               $                $                $
-----------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $               $                $                $
-----------------------------------------------------------------------------------
 CLASS B                 $               $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                 $               $                $                $
-----------------------------------------------------------------------------------
</TABLE>


CALAMOS GROWTH FUND                                                           37
<PAGE>   48

CONVERTIBLE SECURITY --
corporate security (usually a preferred stock or bond) that is exchangeable at
the option of the holder for a fixed number of other securities (usually common
stock) at a set price or formula.
CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.


<TABLE>
<S>          <C>
[GLOBAL      Global Convertible Fund
   GROWTH    (formerly named Global
      AND    Growth and Income Fund)
   INCOME
     FUND
    ICON]
</TABLE>


WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?


The primary objective of the Global Convertible Fund is high long-term total
return through capital appreciation and current income.



The Fund invests primarily in a globally diversified portfolio of convertible,
equity and fixed-income securities with equal emphasis on capital appreciation
and current income. Normally the Fund invests in the securities markets of at
least three countries, which may include the United States.



Under normal market conditions we invest at least 65% of the Fund's total assets
in convertible securities. We believe there are various advantages to buying
convertible securities, including:


      - The potential for capital appreciation if the value of the underlying
        common stock increases

      - The relatively high yield received from dividend or interest payments as
        compared to common stock dividends

      - The relatively lower price volatility as compared to common stock

The Fund seeks to profit from this strategy by receiving interest on the
convertible security and through an increase in the convertible's value. The
convertible's value goes up when the market value of the underlying common stock
increases above the conversion price.

We typically apply a four-step approach when selecting convertible securities
for the Fund, which includes:

      1. Evaluating the default risk of the convertible security using
         traditional credit analysis

      2. Analyzing the convertible's underlying common stock to determine its
         capital appreciation potential

      3. Assessing the risk/return potential of the convertible security

      4. Evaluating the convertible security's impact on the overall composition
         of the Fund and it's diversification strategy

 38
CALAMOS GLOBAL CONVERTIBLE FUND
<PAGE>   49


          Global Convertible Fund (formerly named Global Growth and Income Fund)
                                                                          [ICON]

DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.


In the equity and credit analysis, we generally consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management

The Fund's assets not invested in convertible securities are invested in common
stocks that, in our judgment, provide opportunities for long-term capital
appreciation, or in other securities as described below. The Fund generally
invests in securities of companies that are medium-sized and larger relative to
the securities markets of the countries in which those securities are traded.

A significant portion of the Fund's assets will be invested in foreign
securities, and the Fund may invest without limit in high yield fixed-income
securities (often referred to as "junk bonds"). The average term to maturity of
the Fund's fixed income securities will typically range from five to ten years.
The Fund's assets may also be invested in securities that have not been
registered for public sale, but that are eligible for purchase and sale by
certain qualified institutional buyers (Rule 144A securities).

WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

FOREIGN SECURITIES.  We may invest up to 100% of the Fund's net assets in
securities of foreign issuers. A foreign issuer is a company organized under the
laws of a foreign country that is principally traded in the financial markets of
a foreign country. Foreign securities do not include securities represented by
American Depository Receipts (ADRs) or securities guaranteed by a U.S. person.
ADRs are traded on U.S. exchanges and represent an ownership interest in a
foreign security. They are generally issued by a U.S. bank as a substitute for
direct ownership of the foreign security. International investing allows the
Fund to achieve greater diversification and to take advantage of changes in
foreign economies and market conditions.

CONVERTIBLE SECURITIES.  Convertible securities include debt obligations and
preferred stock of the company issuing the security, which may be exchanged for
a predetermined price (the conversion price) into the common stock of the
issuer. Convertible securities generally offer lower interest or dividend yields
than non-convertible securities of similar quality.

Many convertible securities are issued with a "call" feature that allows the
issuer of the security to choose when to redeem the security. If a convertible

CALAMOS GLOBAL CONVERTIBLE FUND                                               39
<PAGE>   50

Global Convertible Fund (formerly named Global Growth and Income Fund)
[ICON]

security held by the Fund is called for redemption, the Fund will be required to
redeem the security, convert it into the underlying common stock, or sell it to
a third party at a time that may be unfavorable to the Fund. Conversely, certain
convertible debt securities may provide a "put option" which entitles the Fund
to make the issuer redeem the security at a premium over the stated principal
amount of the debt security.


SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible component"). The fixed-income component is achieved by investing
in non-convertible, fixed-income securities such as bonds, preferred stocks and
money market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index.


The Fund may also purchase synthetic securities created by other parties,
typically investment banks, including convertible structured notes. Purchasing
synthetic convertible securities may offer more flexibility than purchasing a
convertible security. Different companies may issue the fixed-income and
convertible components which may be purchased separately, and at different
times. Synthetic convertible securities that are created by the investment
manager are not considered convertible securities for purposes of the Fund's
policy to invest at least 65% of its total assets in convertible securities.


EQUITY SECURITIES.  Equity securities include exchange-traded and over-the-
counter common and preferred stocks, warrants, rights, and depository receipts.
An investment in the equity securities of a company represents a proportionate
ownership interest in that company. Therefore, the Fund participates in the
financial success or failure of any company in which we have an equity interest.
Compared with other asset classes, equity investments have a greater potential
for gain.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund may invest without
limit in convertible and non-convertible debt securities rated BB or lower by
Standard & Poor's Corporation, or Ba or lower by Moody's Investor Services,
Inc., and in securities that are not rated but are considered by us to be of
similar quality (commonly called "junk" bonds). The Fund will not, however,
acquire a security rated below C.

 40
CALAMOS GLOBAL CONVERTIBLE FUND
<PAGE>   51

          Global Convertible Fund (formerly named Global Growth and Income Fund)
                                                                          [ICON]

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.


OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

FOREIGN SECURITIES.  We may invest up to 100% of the Fund's net assets in
securities of foreign issuers. There are special risks associated with investing
in foreign securities that are not typically associated with investing in U. S.
companies. These risks include fluctuations in the exchange rates of foreign
currencies that may affect the U.S. dollar value of a security, and the
possibility of substantial price volatility as a result of political and
economic instability in the foreign country. Other risks of investing in foreign
securities include: less public information about issuers of securities,
different securities regulation, different accounting, auditing and financial
reporting standards, and less liquidity in foreign markets than in U.S. markets.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.

CALAMOS GLOBAL CONVERTIBLE FUND                                               41
<PAGE>   52


Global Convertible Fund (formerly named Global Growth and Income Fund)
[ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.

EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.

CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying common stock falls below the conversion price of the security.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.

EQUITY INVESTMENTS.  Equity investments are subject to greater fluctuations in
market value than other asset classes as a result of such factors as a company's
business performance, investor perceptions, stock market trends and general
economic conditions. Smaller companies are especially sensitive to these
factors, and therefore may experience more price volatility than larger
companies.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
we will determine whether securities purchased under Rule 144A are illiquid. The
Fund is restricted to investing no more than 15% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.

 42
CALAMOS GLOBAL CONVERTIBLE FUND
<PAGE>   53

          Global Convertible Fund (formerly named Global Growth and Income Fund)
                                                                          [ICON]

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund's investment in junk
bonds entails a greater risk than an investment in higher-rated securities.
Although junk bonds typically pay higher interest rates than investment-grade
bonds, there is a greater likelihood that the company issuing the junk bond will
default on interest and principal payments. In the event of an issuer's
bankruptcy, claims of other creditors may have priority over the claims of junk
bond holders, leaving few or no assets to repay them. Junk bonds are also more
sensitive to adverse economic changes or individual corporate developments than
higher quality bonds. During a period of adverse economic changes, including a
period of rising interest rates, companies issuing junk bonds may be unable to
make principal and interest payments.


SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component
falls below the exercise price of the warrant or option, the warrant or option
may lose all value.

HOW HAS THE FUND PERFORMED IN THE PAST?

The bar chart and table below provide some indication of the risks of investing
in the Fund by showing changes in the Fund's performance from calendar year to
calendar year and how the Fund's average annual total returns compare with those
of a broad measure of market performance. As always, please note that how the
Fund has performed in the past cannot predict how it will perform in the future.
The information provided in the chart is for Class A shares, and does not
reflect sales charges, which reduce return.

CALAMOS GLOBAL CONVERTIBLE FUND                                               43
<PAGE>   54

Global Convertible Fund (formerly named Global Growth and Income Fund)
[ICON]

CALENDAR YEAR PERFORMANCE

[Global Growth/Income Fund Bar Chart]

<TABLE>
<CAPTION>
                                                                 CALAMOS GLOBAL GROWTH & INCOME FUND %
                                                                 -------------------------------------
<S>                                                           <C>
1997                                                                             18.34
1998                                                                             14.09
1999                                                                              0.00
</TABLE>


For the period included in the bar chart, the Fund's highest return for a
calendar quarter was [13.03% (the 2nd quarter of 1997)], and the Fund's lowest
return for a calendar quarter was -11.91% (the 3rd quarter of 1998).



The Fund's year-to-date total return as of June 30, 2000 was        %.


 44
CALAMOS GLOBAL CONVERTIBLE FUND
<PAGE>   55

          Global Convertible Fund (formerly named Global Growth and Income Fund)
                                                                          [ICON]

TOTAL RETURN -- the return on an investment including income from dividends and
interest as well as appreciation or depreciation in the price of the security
over a given time period.


AVERAGE ANNUAL TOTAL RETURNS

For periods ended December 31, 1999



<TABLE>
<CAPTION>
                                                   SINCE CLASS A       SINCE CLASS C
                                    ONE YEAR         INCEPTION*         INCEPTION**
-------------------------------------------------------------------------------------
<S>                                 <C>            <C>                 <C>
 CLASS A                                 --%              --%                 --
-------------------------------------------------------------------------------------
 CLASS B( 7/8)                           --               --                  --
-------------------------------------------------------------------------------------
 CLASS C                                 --%              --                  --%
-------------------------------------------------------------------------------------
 MORGAN STANLEY CAPITAL
 INTERNATIONAL WORLD INDEX#                %                %***              --
-------------------------------------------------------------------------------------
</TABLE>


*   Inception date for Class A shares is 9/9/96.

**  Inception date for Class C shares is 9/24/96.

***  Index returns for the life of Class A shares are from 9/1/96.

#   The Morgan Stanley Capital International World Index is an unmanaged equity
    index that is an arithmetic, market value-weighted average of the
    performance of over 1,460 securities listed on stock exchanges around the
    world. Index returns assume reinvestment of dividends and, unlike Fund
    returns, do not reflect any fees, expenses or sales charges.

( 7/8)   Because this is a new share class, it did not have performance to
         report as of the date of this prospectus.


CALAMOS GLOBAL CONVERTIBLE FUND                                               45
<PAGE>   56
Global Convertible Fund (formerly named Global Growth and Income Fund)
[ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
YOUR INVESTMENT):                                               CLASS A      CLASS B      CLASS C
-------------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>          <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE         NONE
-------------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%        1.00%
-------------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED
 ON REINVESTED DIVIDENDS/DISTRIBUTIONS                            NONE         NONE         NONE
-------------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%        1.00%
-------------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE         NONE
-------------------------------------------------------------------------------------------------
(1)  The redemption of Class A shares purchased at net asset value under the $1,000,000 purchase
     order privilege may be subject to a contingent deferred sales charge of 1% if redeemed
     within one year of purchase and .50% if redeemed during the second year following purchase.
(2)  A service charge of $9 is deducted from proceeds of redemption paid by wire.
-------------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
-------------------------------------------------------------------------------------------------
 MANAGEMENT FEES                                                 1.00%        1.00%        1.00%
-------------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES*                                       .25%        1.00%        1.00%
-------------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                    %            %            %
-------------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES***                                  %            %            %
-------------------------------------------------------------------------------------------------
 FEE WAIVER AND/OR EXPENSE REIMBURSEMENT                             %            %            %
-------------------------------------------------------------------------------------------------
 NET EXPENSES                                                    2.00%        2.50%        2.50%
-------------------------------------------------------------------------------------------------
</TABLE>



*  Effective April 1, 2000, the distribution and service (12b-1) fee rate for
   Class A shares of the Fund was reduced from .50% to .25% of average net
   assets.



**  "Other Expenses" for Class B shares are based on estimated amounts for the
    current fiscal year. Class B shares are expected to commence operations on
    or about August 1, 2000.



*** Pursuant to a written agreement, CALAMOS ASSET MANAGEMENT, INC. ("CAM") has
    voluntarily decided to waive fees and/or reimburse fund expenses so that the
    Total Annual Operating Expenses are limited to 2.00% for Class A shares and
    2.50% for Class B and Class C shares. The fee waiver and/or reimbursement is
    binding on CAM through August 31, 2001.


 46
CALAMOS GLOBAL CONVERTIBLE FUND
<PAGE>   57

          Global Convertible Fund (formerly named Global Growth and Income Fund)
                                                                          [ICON]

EXAMPLES:



Based on the figures above (including one year of expenses capped by the
investment manager), these examples are intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $ --            $   --           $   --           $   --
-----------------------------------------------------------------------------------
 CLASS B                 $ --            $   --               --               --
-----------------------------------------------------------------------------------
 CLASS C                 $ --            $   --           $   --           $   --
-----------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS       FIVE YEARS       TEN YEARS
-----------------------------------------------------------------------------------
<S>                    <C>            <C>               <C>              <C>
 CLASS A                 $               $                $                $
-----------------------------------------------------------------------------------
 CLASS B                 $               $                    --               --
-----------------------------------------------------------------------------------
 CLASS C                 $               $                $                $
-----------------------------------------------------------------------------------
</TABLE>


CALAMOS GLOBAL CONVERTIBLE FUND                                               47
<PAGE>   58

YIELD -- the annual return of an investment, expressed as a percentage. For
bonds and notes, it is the coupon rate (interest rate) divided by the market
price.

<TABLE>
<S>          <C>
[HIGH        High Yield Fund
    YIELD
     FUND
    ICON]
</TABLE>

WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?

The primary objective of the High Yield Fund is the highest level of current
income obtainable with reasonable risk. Its secondary objective is capital gain
where consistent with the Fund's primary objective.

The Fund invests mainly in a diversified portfolio of high yield fixed-income
securities (often referred to as "junk bonds") issued by both U.S. and foreign
companies. Under normal market conditions, we invest at least 65% of the Fund's
total assets in high yield, fixed-income securities (junk bonds).

The Fund may invest without limit in high yield fixed-income securities (junk
bonds). The average term to maturity of the Fund's fixed-income securities will
typically range from five to ten years. The Fund may invest up to 25% of its net
assets in foreign securities. The Fund's assets may also be invested in
securities that have not been registered for public sale, but that are eligible
for purchase and sale by certain qualified institutional buyers (Rule 144A
Securities).

The high yield fixed-income securities ("junk bonds") in which the Fund intends
to invest have lower credit ratings than investment grade securities [those
rated BBB or higher by Standard and Poor's Corporation ("S&P") or Baa or higher
by Moody's Investors Service, Inc. ("Moody's")]. However, junk bonds typically
offer a significantly higher yield, as well as greater risks, than investment
grade securities. The Fund may invest in both convertible and non-convertible
high yield bonds. Convertible debt securities are exchangeable for equity
securities of the issuer at a predetermined price, and typically offer greater
appreciation potential than non-convertible debt securities.

The ratings of S&P and Moody's are used only as preliminary indicators of
investment quality. We also use our own credit research and analysis.

Achievement of the Fund's investment objectives will be more dependent on our
credit analysis than would be the case if the Fund were investing in higher-
quality debt securities. Our analyses may take into consideration such
quantitative factors as an issuer's present and potential liquidity,
profitability, internal capability to generate funds, debt/equity ratio and debt
servicing capabilities, and such qualitative factors as an assessment of
management, industry characteristics, accounting methodology, and foreign
business exposure.

The portion of the Fund's assets that is not invested in junk bonds may be
invested in equity securities, higher rated fixed-income securities, and other
securities as described below.

 48
CALAMOS HIGH YIELD FUND
<PAGE>   59

                                                                 High Yield Fund
                                                                          [ICON]

DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.

WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  As discussed above, the Fund
may invest without limit in convertible and non-convertible debt securities
rated BB or lower by S&P, or Ba or lower by Moody's, and in securities that are
not rated but are considered by us to be of similar quality.

CONVERTIBLE SECURITIES.  Convertible securities include debt obligations and
preferred stock of the company issuing the security, which may be exchanged for
a predetermined price (the conversion price) into the common stock of the
issuer. Convertible securities generally offer lower interest or dividend yields
than non-convertible securities of similar quality. Many convertible securities
are issued with a "call" feature that allows the issuer of the security to
choose when to redeem the security. If a convertible security held by the Fund
is called for redemption, the Fund will be required to redeem the security;
convert it into the underlying common stock; or sell it to a third party at a
time that may be unfavorable to the Fund. Conversely, certain convertible debt
securities may provide a "put option" which entitle the Fund to make the issuer
redeem the security at a premium over the stated principal amount of the debt
security.


SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible component"). The fixed-income component is achieved by investing
in non-convertible, fixed-income securities such as bonds, preferred stocks and
money market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index. The Fund may also purchase synthetic securities created by
other parties, typically investment banks, including convertible structured
notes. Purchasing synthetic convertible securities may offer more flexibility
than purchasing a convertible security. Different companies may issue the fixed-
income and convertible components which may be purchased separately, and at
different times.


FOREIGN SECURITIES.  We may invest up to 25% of the Fund's net assets in
securities of foreign issuers. A foreign issuer is a company organized under the
laws of a foreign country that is principally traded in the financial markets of
a foreign country. For purposes of the 25% limitation, foreign securities do not
include securities represented by American Depository Receipts (ADRs) or
securities guaranteed by a U.S. person. ADRs are traded on U.S. exchanges and
represent an ownership interest in a foreign security. They are generally issued

CALAMOS HIGH YIELD FUND                                                       49
<PAGE>   60
High Yield Fund
[ICON]

by a U.S. bank as a substitute for direct ownership of the foreign security.
International investing allows the Fund to achieve greater diversification and
to take advantage of changes in foreign economies and market conditions.

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money
market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.

OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  As mentioned above, at least
65% of the Fund's total assets will be invested in junk bonds. The Fund's
investment in junk bonds entails a greater risk than an investment in higher-
rated securities. Although junk bonds typically pay higher interest rates than
investment-grade bonds, there is a greater likelihood that the company issuing
the junk bonds will default on interest and principal payments. In the event of
an issuer's bankruptcy, claims of other creditors may have priority over the
claims of junk bond holders, leaving few or no assets to repay them. Junk bonds
are also more sensitive to adverse economic changes or individual corporate
developments than higher quality bonds. During a period of adverse economic
changes, including a period of rising interest rates, companies issuing junk
bonds may be unable to make principal and interest payments.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.

 50
CALAMOS HIGH YIELD FUND
<PAGE>   61

                                                                 High Yield Fund
                                                                          [ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.

CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying stock falls below the conversion price of the security.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
we will determine whether securities purchased under Rule 144A are illiquid. The
Fund is restricted to investing no more than 10% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.

FOREIGN SECURITIES.  We may invest up to 25% of the Fund's net assets in the
securities of foreign issuers. There are special risks associated with investing
in foreign securities that are not typically associated with investing in U. S.
companies. These risks include fluctuations in the exchange rates of foreign
currencies that may affect the U.S. dollar value of a security, and the
possibility of substantial price volatility as a result of political and
economic instability in

CALAMOS HIGH YIELD FUND                                                       51
<PAGE>   62
High Yield Fund
[ICON]

the foreign country. Other risks of investing in foreign securities include:
less public information about issuers of securities, different securities
regulation, different accounting, auditing and financial reporting standards,
and less liquidity in foreign markets than in U.S. markets.

SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component
falls below the exercise price of the warrant or option, the warrant or option
may lose all value.

Please note that performance information has not been presented for the Fund
since the Fund has not been in existence for at least one calendar year.

 52
CALAMOS HIGH YIELD FUND
<PAGE>   63
                                                                 High Yield Fund
                                                                          [ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
SHAREHOLDER FEES (FEES PAID DIRECTLY FROM YOUR INVESTMENT):     CLASS A      CLASS B    CLASS C
-----------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>        <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE       NONE
-----------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%      1.00%
-----------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED ON
 REINVESTED DIVIDENDS/DISTRIBUTIONS                               NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
</TABLE>



(1)  The redemption of Class A shares purchased at net asset value under the
     $1,000,000 purchase order privilege may be subject to a contingent deferred
     sales charge of 1% if redeemed within one year of purchase and 50% if
     redeemed during the second year following purchase.


(2)  A service charge of $9 is deducted from proceeds of redemption paid by
     wire.

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

<TABLE>
<S>                                                             <C>          <C>        <C>
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
-----------------------------------------------------------------------------------------------
 Management Fees                                                  .75%         .75%       .75%
-----------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES*                                       .25%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 OTHER EXPENSES**                                                    %          --%          %
-----------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES***                                  %          --%          %
-----------------------------------------------------------------------------------------------
 FEE WAIVER AND/OR EXPENSE REIMBURSEMENT                             %          --%          %
-----------------------------------------------------------------------------------------------
 NET EXPENSES                                                    2.00%        2.50%      2.50%
-----------------------------------------------------------------------------------------------
</TABLE>



*  Effective April 1, 2000, the distribution and service (12b-1) fee rate for
   Class A shares of the Fund was reduced from .50% to .25% of average net
   assets.



**  "Other Expenses" for Class B shares are based on estimated amounts for the
    current fiscal year. Class B shares are expected to commence operations on
    or about August 1, 2000.



*** Pursuant to a written agreement, CALAMOS ASSET MANAGEMENT, INC. ("CAM") has
    voluntarily decided to waive fees and/or reimburse fund expenses so that the
    Total Annual Operating Expenses are limited to 2.00% for Class A shares and
    2.50% for Class B and Class C shares. The fee waiver and/or reimbursement is
    binding on CAM through August 31, 2001.


CALAMOS HIGH YIELD FUND                                                       53
<PAGE>   64
High Yield Fund
[ICON]

EXAMPLES:


Based on the figures above (including one year of expenses capped by the
investment manager), these examples are intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year, three years, five
years, and ten years, except for Class B shares, which show one year and three
years only. In each case, we assume 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 Fund's operating expenses remain the same. Although your actual
costs may be higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS           FIVE YEARS           TEN YEARS
-------------------------------------------------------------------------------------------
<S>                    <C>            <C>                   <C>                  <C>
 CLASS A                $                $                    $                    $
-------------------------------------------------------------------------------------------
 CLASS B                $                $                    $                    $
-------------------------------------------------------------------------------------------
 CLASS C                $                $                    $                    $
-------------------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                       ONE YEAR       THREE YEARS           FIVE YEARS           TEN YEARS
-------------------------------------------------------------------------------------------
<S>                    <C>            <C>                   <C>                  <C>
 CLASS A                $                $                    $                    $
-------------------------------------------------------------------------------------------
 CLASS B                $                $                        --                   --
-------------------------------------------------------------------------------------------
 CLASS C                $                $                    $                    $
-------------------------------------------------------------------------------------------
</TABLE>


 54
CALAMOS HIGH YIELD FUND
<PAGE>   65

CONVERTIBLE SECURITY --
corporate security (usually a preferred stock or bond) that is exchangeable at
the option of the holder for a fixed number of other securities (usually common
stock) at a set price or formula.
CAPITAL APPRECIATION -- an increase in the market price of an asset, such as
stocks or bonds.


<TABLE>
<S>          <C>
[GLOBAL      Global Convertible
   GROWTH    Technology Fund
      AND
   INCOME
     FUND
    ICON]
</TABLE>


WHAT ARE THE INVESTMENT OBJECTIVES AND PRINCIPAL STRATEGIES OF THE FUND?


The primary objective of the Global Convertible Technology Fund is [high long-
term total return through capital appreciation and current income.]



Under normal market conditions we invest at least 65% of the Fund's total assets
in convertible securities of companies in the technology sector. This may
include companies of any size that commit a significant portion of their assets
to, or derive a significant portion of their revenues or net income from, the
technology sector. Examples of industries within the technology sector are
electronics, computers/software, semiconductor, telecommunications services, and
Internet/E-commerce. As a global fund, the Fund normally invests in the
securities markets of at least three countries, which may include the United
States.



We believe there are various advantages to buying convertible securities,
including:


      - The potential for capital appreciation if the value of the underlying
        common stock increases

      - The relatively high yield received from dividend or interest payments as
        compared to common stock dividends

      - The relatively lower price volatility as compared to common stock

The Fund seeks to profit from this strategy by receiving interest on the
convertible security and through an increase in the convertible's value. The
convertible's value goes up when the market value of the underlying common stock
increases above the conversion price.

We typically apply a four-step approach when selecting convertible securities
for the Fund, which includes:

      1. Evaluating the default risk of the convertible security using
         traditional credit analysis

      2. Analyzing the convertible's underlying common stock to determine its
         capital appreciation potential

      3. Assessing the risk/return potential of the convertible security

      4. Evaluating the convertible security's impact on the overall composition
         of the Fund and it's diversification strategy


CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND                                    55

<PAGE>   66


Global Convertible Technology Fund
[ICON]

DEBT OBLIGATION -- a security which is a written promise to repay a debt such as
a bond or note.


In the equity and credit analysis, we generally consider the issuer's:

      - financial soundness

      - ability to make interest and dividend payments

      - earnings and cash-flow forecast

      - quality of management


The Fund's assets not invested in convertible securities are invested in common
stocks that, in our judgment, provide opportunities for long-term capital
appreciation, or in other securities as described below.



A significant portion of the Fund's assets will be invested in foreign
securities, and the Fund may invest without limit in high yield fixed-income
securities (often referred to as "junk bonds"). The average term to maturity of
the Fund's fixed income securities will typically range from [five to ten
years.] The Fund's assets may also be invested in securities that have not been
registered for public sale, but that are eligible for purchase and sale by
certain qualified institutional buyers (Rule 144A securities).


WHAT ARE THE TYPES OF SECURITIES THE FUND INVESTS IN?

FOREIGN SECURITIES.  We may invest up to 100% of the Fund's net assets in
securities of foreign issuers. A foreign issuer is a company organized under the
laws of a foreign country that is principally traded in the financial markets of
a foreign country. Foreign securities do not include securities represented by
American Depository Receipts (ADRs) or securities guaranteed by a U.S. person.
ADRs are traded on U.S. exchanges and represent an ownership interest in a
foreign security. They are generally issued by a U.S. bank as a substitute for
direct ownership of the foreign security. International investing allows the
Fund to achieve greater diversification and to take advantage of changes in
foreign economies and market conditions.

CONVERTIBLE SECURITIES.  Convertible securities include debt obligations and
preferred stock of the company issuing the security, which may be exchanged for
a predetermined price (the conversion price) into the common stock of the
issuer. Convertible securities generally offer lower interest or dividend yields
than non-convertible securities of similar quality.

Many convertible securities are issued with a "call" feature that allows the
issuer of the security to choose when to redeem the security. If a convertible
security held by the Fund is called for redemption, the Fund will be required to
redeem the security, convert it into the underlying common stock, or sell it


 56

CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND
<PAGE>   67

                                              Global Convertible Technology Fund
                                                                          [ICON]

to a third party at a time that may be unfavorable to the Fund. Conversely,
certain convertible debt securities may provide a "put option" which entitles
the Fund to make the issuer redeem the security at a premium over the stated
principal amount of the debt security.


SYNTHETIC CONVERTIBLE SECURITIES.  We may also create a "synthetic" convertible
security by combining separate securities that possess the two principal
characteristics of a true convertible security, i.e., fixed-income securities
("fixed-income component") and the right to acquire equity securities
("convertible component"). The fixed-income component is achieved by investing
in non-convertible, fixed-income securities such as bonds, preferred stocks and
money market instruments. The convertible component is achieved by investing in
warrants or options to buy common stock at a certain exercise price, or options
on a stock index.


The Fund may also purchase synthetic securities created by other parties,
typically investment banks, including convertible structured notes. Purchasing
synthetic convertible securities may offer more flexibility than purchasing a
convertible security. Different companies may issue the fixed-income and
convertible components which may be purchased separately, and at different
times. Synthetic convertible securities that are created by the investment
manager are not considered convertible securities for purposes of the Fund's
policy to invest at least 65% of its total assets in convertible securities.


EQUITY SECURITIES.  Equity securities include exchange-traded and over-the-
counter common and preferred stocks, warrants, rights, and depository receipts.
An investment in the equity securities of a company represents a proportionate
ownership interest in that company. Therefore, the Fund participates in the
financial success or failure of any company in which we have an equity interest.
Compared with other asset classes, equity investments have a greater potential
for gain.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund may invest without
limit in convertible and non-convertible debt securities rated BB or lower by
Standard & Poor's Corporation, or Ba or lower by Moody's Investor Services,
Inc., and in securities that are not rated but are considered by us to be of
similar quality (commonly called "junk" bonds). The Fund will not, however,
acquire a security rated below C.

DEFENSIVE INVESTING.  We may depart from the Fund's principal investment
strategies in response to adverse market, economic or political conditions by
taking temporary defensive positions without limitation in all types of money


CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND                                    57

<PAGE>   68


Global Convertible Technology Fund
[ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.

EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

market and short term debt securities, and repurchase agreements. In a
repurchase agreement, the Fund purchases a security and the seller (a bank or
securities dealer) simultaneously agrees to buy back (repurchase) the security
at the same price plus an amount equal to an agreed-upon interest rate, on a
specified date. During periods when we have assumed a temporary defensive
position, the Fund may not be able to achieve its investment objective.

OTHER SECURITIES.  Although not the principal investments or strategies of the
Fund, we may utilize other investments and investment techniques which may
impact performance, including options, warrants, futures and other strategic
transactions. More information about Fund investments and strategies is provided
in the Statement of Additional Information.

WHAT ARE THE PRINCIPAL RISKS OF INVESTING IN THE FUND?

The Fund's principal risks include market risk and investment management risk.
Please refer to the discussion of those risks under "The Funds" at the front of
this prospectus.


TECHNOLOGY CONCENTRATION.  Your investment in the Fund is subject to increased
risk because the Fund concentrates its investments in technology companies
rather than diversifying its investments among various sectors. For example,
price competition, competing technologies, changes in governmental policies, and
antitrust enforcement could have a significant impact on the financial condition
of companies in the technology sector. In addition, many technology companies
are smaller companies that may have limited lines of business and financial
resources, making them highly vulnerable to business and economic risks.



NON-DIVERSIFIED FUND.  As a non-diversified fund, the Fund may invest a greater
percentage of its assets in a smaller number of companies than a diversified
fund. Therefore, the Fund may be subject to increased risk as a result of
changes in the financial condition or the market's assessment of such companies.


FOREIGN SECURITIES.  We may invest up to 100% of the Fund's net assets in
securities of foreign issuers. There are special risks associated with investing
in foreign securities that are not typically associated with investing in U. S.
companies. These risks include fluctuations in the exchange rates of foreign
currencies that may affect the U.S. dollar value of a security, and the
possibility of substantial price volatility as a result of political and
economic instability in the foreign country. Other risks of investing in foreign
securities include: less public information about issuers of securities,
different securities regulation,


 58

CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND
<PAGE>   69

                                              Global Convertible Technology Fund
                                                                          [ICON]

MARKET PRICE -- the last reported sales price of a security (if on an exchange)
or the last bid and ask prices if the security is traded over-the-counter.
EQUITY -- ownership interest in a corporation in the form of common or preferred
stock.

different accounting, auditing and financial reporting standards, and less
liquidity in foreign markets than in U.S. markets.

DEFAULT RISK.  Default risk refers to the risk that a company who issues a debt
security will be unable to fulfill its obligation to repay principal and
interest. The lower a bond is rated, the greater its default risk.

INTEREST RATE RISK.  Interest rate risk is the risk that the Fund's investments
will decrease in value as a result of an increase in interest rates. Generally,
there is an inverse relationship between the value of a debt security and
interest rates. Therefore, the value of the bonds held by the Fund generally
decrease in periods when interest rates are rising. In addition, interest rate
changes normally have a greater effect on prices of longer-term bonds than
shorter-term bonds.

CONVERTIBLE SECURITIES.  As with all fixed-income securities, the market value
of convertible securities tends to decline as interest rates increase.
Conversely, a convertible's market value increases as interest rates decline.
However, the convertible's market value tends to reflect the market price of the
common stock of the issuing company when that stock price is greater than the
convertible's "conversion price". The conversion price is defined as the
predetermined price at which the convertible could be exchanged for the
associated stock. A convertible security may lose all of its value if the value
of the underlying common stock falls below the conversion price of the security.

As the market price of the underlying common stock declines, the price of the
convertible security tends to be influenced more by the yield of the convertible
security. Thus, it may not decline in price to the same extent as the underlying
common stock. In the event of a liquidation of the issuing company, holders of
convertible securities would be paid before the company's common stock holders.
Consequently, the issuer's convertible securities entail less risk than its
common stock.

EQUITY INVESTMENTS.  Equity investments are subject to greater fluctuations in
market value than other asset classes as a result of such factors as a company's
business performance, investor perceptions, stock market trends and general
economic conditions. Smaller companies are especially sensitive to these
factors, and therefore may experience more price volatility than larger
companies.

RULE 144A SECURITIES.  The Fund may invest without limit in securities that have
been privately placed but are eligible for purchase and sale by certain
qualified institutional buyers such as the Fund under Rule 144A under the
Securities Act of 1933. Under the supervision of the Fund's board of trustees,
CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND                                    59
<PAGE>   70
Global Convertible Technology Fund
[ICON]

we will determine whether securities purchased under Rule 144A are illiquid. The
Fund is restricted to investing no more than 15% of its total assets in
securities that are illiquid, that is, not readily marketable. If qualified
institutional buyers are unwilling to purchase these Rule 144A Securities, the
percent of the Fund's assets invested in illiquid securities would increase.

HIGH YIELD FIXED-INCOME SECURITIES (JUNK BONDS).  The Fund's investment in junk
bonds entails a greater risk than an investment in higher-rated securities.
Although junk bonds typically pay higher interest rates than investment-grade
bonds, there is a greater likelihood that the company issuing the junk bond will
default on interest and principal payments. In the event of an issuer's
bankruptcy, claims of other creditors may have priority over the claims of junk
bond holders, leaving few or no assets to repay them. Junk bonds are also more
sensitive to adverse economic changes or individual corporate developments than
higher quality bonds. During a period of adverse economic changes, including a
period of rising interest rates, companies issuing junk bonds may be unable to
make principal and interest payments.

SYNTHETIC CONVERTIBLE SECURITIES.  The value of a synthetic convertible security
will respond differently to market fluctuations than a convertible security
because a synthetic convertible is composed of two or more separate securities,
each with its own market value. In addition, if the value of the underlying
common stock or the level of the index involved in the convertible component
falls below the exercise price of the warrant or option, the warrant or option
may lose all value.


PERFORMANCE



Please note that performance information has not been presented for the Fund
since the Fund has not been in existence for at least one calendar year.




 60
CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND
<PAGE>   71
                                              Global Convertible Technology Fund
                                                                          [ICON]

SHAREHOLDER FEES -- fees paid directly from your investment, which include sales
charges and redemption fees that you may pay when you buy or sell shares of the
Fund.
ANNUAL FUND OPERATING EXPENSES -- expenses that cover the costs of operating the
Fund.

MANAGEMENT FEES -- a fee paid to the investment adviser for managing the Fund.
DISTRIBUTION FEES -- fees used to support the Fund's marketing and distribution
efforts, such as advertising and promotion.

WHAT ARE THE FEES AND EXPENSES OF THE FUND?
The tables below describe the fees and expenses that you may pay if you buy and
hold shares of the Fund. There are shareholder fees which are subtracted
directly from the amount you invest and there are annual operating expenses
which are subtracted each year from the assets in the Fund. Please refer to the
"How Can I Buy Shares?" section of this prospectus for information regarding fee
discounts and waivers.


<TABLE>
<CAPTION>
SHAREHOLDER FEES (FEES PAID DIRECTLY FROM
YOUR INVESTMENT):                                               CLASS A      CLASS B    CLASS C
-----------------------------------------------------------------------------------------------
<S>                                                             <C>          <C>        <C>
 MAXIMUM SALES CHARGE (LOAD) ON PURCHASES
 (AS A PERCENTAGE OF OFFERING PRICE)                             4.75%         NONE       NONE
-----------------------------------------------------------------------------------------------
 MAXIMUM DEFERRED SALES CHARGE (LOAD)
 (AS A PERCENTAGE OF REDEMPTION PROCEEDS)                         NONE(1)     5.00%      1.00%
-----------------------------------------------------------------------------------------------
 MAXIMUM SALES CHARGE (LOAD) IMPOSED
 ON REINVESTED DIVIDENDS/DISTRIBUTIONS                            NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
 REDEMPTION FEE ON SHARES HELD 6 MONTHS OR LESS(2)               1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 EXCHANGE FEE                                                     NONE         NONE       NONE
-----------------------------------------------------------------------------------------------
(1)  The redemption of Class A shares purchased at net asset value under the $1,000,000
     purchase order privilege may be subject to a contingent deferred sales charge of 1% if
     redeemed within one year of purchase and .50% if redeemed during the second year following
     purchase.
(2)  A service charge of $9 is deducted from proceeds of redemption paid by wire.
-----------------------------------------------------------------------------------------------
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS):
-----------------------------------------------------------------------------------------------
 MANAGEMENT FEES                                                 1.00%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 DISTRIBUTION (12b-1) FEES                                        .25%        1.00%      1.00%
-----------------------------------------------------------------------------------------------
 OTHER EXPENSES*                                                     %            %          %
-----------------------------------------------------------------------------------------------
 TOTAL ANNUAL OPERATING EXPENSES**                                   %            %          %
-----------------------------------------------------------------------------------------------
 FEE WAIVER AND/OR EXPENSE REIMBURSEMENT                             %            %          %
-----------------------------------------------------------------------------------------------
 NET EXPENSES                                                    2.00%        2.50%      2.50%
-----------------------------------------------------------------------------------------------
</TABLE>



*  "Other Expenses" are based on estimated amounts for the current fiscal year.
   The Fund is expected to commence operations on or about August 1, 2000.



**  Pursuant to a written agreement, CALAMOS ASSET MANAGEMENT, INC. ("CAM") has
    voluntarily decided to waive fees and/or reimburse fund expenses so that the
    Total Annual Operating Expenses are limited to 2.00% for Class A shares and
    2.50% for Class B and Class C shares. The fee waiver and/or reimbursement is
    binding on CAM through August 31, 2001.


CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND                                    61
<PAGE>   72
Global Convertible Technology Fund
[ICON]

EXAMPLES:


Based on the figures above (including one year of expenses capped by the
investment manager), these examples are intended to help you compare the cost of
investing in the Fund with the cost of investing in other mutual funds.



This example shows an investment made and held for one year and three years. In
each case, we assume 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
Fund's operating expenses remain the same. Although your actual costs may be
higher or lower, based on these assumptions your costs would be:



<TABLE>
<CAPTION>
                                       ONE YEAR                    THREE YEARS
-------------------------------------------------------------------------------
<S>                                    <C>                         <C>
 CLASS A                                 $                            $
-------------------------------------------------------------------------------
 CLASS B                                 $                            $
-------------------------------------------------------------------------------
 CLASS C                                 $                            $
-------------------------------------------------------------------------------
</TABLE>



You would pay the following expenses if you did not redeem your shares:



<TABLE>
<CAPTION>
                                       ONE YEAR                    THREE YEARS
-------------------------------------------------------------------------------
<S>                                    <C>                         <C>
 CLASS A                                 $                            $
-------------------------------------------------------------------------------
 CLASS B                                 $                            $
-------------------------------------------------------------------------------
 CLASS C                                 $                            $
-------------------------------------------------------------------------------
</TABLE>


 62
CALAMOS GLOBAL CONVERTIBLE TECHNOLOGY FUND
<PAGE>   73

<TABLE>
<S>          <C>
[FUND        Fund Facts
    FACTS
    ICON]
</TABLE>

WHO MANAGES THE FUNDS?
--------------------------------------------------------------------------------


The Fund's investments are managed by CALAMOS ASSET MANAGEMENT, INC. ("CAM"),
1111 E. Warrenville Road, Naperville, IL. On June 30, 2000, CAM managed
approximately $  billion in assets of individuals and institutions. CAM is
controlled by John P. Calamos, who has been engaged in the investment advisory
business since 1977.



Subject to the overall authority of the board of trustees, CAM provides
continuous investment supervision and management to the Funds under a management
agreement and also furnishes office space, equipment and management personnel.
For these services, each Fund pays CAM a fee based on average daily net assets
that is accrued daily and paid on a monthly basis. The fee paid by Growth Fund
is at the annual rate of 1% of the first $500 million of average net assets,
 .90% of the next $500 million of average net assets, and .80% of average net
assets in excess of $1 billion. The fee paid by Global Convertible Fund and
Global Convertible Technology Fund is at the annual rate of 1% of average net
assets. The fee paid by High Yield Fund is at the annual rate of .75% of average
net assets. The fee paid by each other Fund is at the annual rate of .75% of the
first $500 million of average net assets, .70% of the next $500 million of
average net assets, and .65% of average net assets in excess of $1 billion.
Prior to August 1, 2000, the fee paid by Growth Fund was at the annual rate of
1% of the first $150 million of average net assets and .75% of average net
assets in excess of $150 million. Prior to August 1, 2000, the fee paid by
Convertible Fund, Convertible Growth and Income Fund, and Market Neutral Fund
was at the annual rate of .75% of the first $150 million of average net assets
and .50% of average net assets in excess of $150 million.



CAM has voluntarily agreed to limit the annual ordinary operating expenses of
each Fund, as a percentage of the average net assets of the particular class of
shares, to 2.00% for Class A shares, 2.50% for Class B shares, and 2.50% for
Class C shares through August 31, 2001.


CALAMOS FAMILY OF FUNDS                                                       63
<PAGE>   74

Fund Facts
[CALAMOS ICON]

For each Fund (other than the High Yield Fund and Global Convertible Technology
Fund, which have not been in operation for a full fiscal year), the actual
amount the Fund paid to CAM in management fees for the most recent fiscal year
was:



<TABLE>
<S>                                <C>
Convertible Fund                         --%
Convertible Growth and Income Fund       --%
Market Neutral Fund                      --%*
Growth Fund                              --%*
Global Convertible Fund                  --%*
</TABLE>



* Reflects the effect of expense limitations and/or fee waivers then in effect.



John P. Calamos and Nick P. Calamos are responsible for managing the portfolios
of Convertible Fund, Convertible Growth and Income Fund, Global Convertible
Fund, High Yield Fund and Global Convertible Technology Fund; John P. Calamos
and John P. Calamos Jr. are primarily responsible for the day-to-day management
of the portfolios of Market Neutral Fund and Growth Fund. During the past five
years, John P. Calamos has been president and a trustee of the Trust and
president of CAM and CALAMOS FINANCIAL SERVICES, INC. ("CFS") an affiliate of
CAM; John P. Calamos, Jr. has been a portfolio manager of CAM; and Nick P.
Calamos has been vice president of the Trust, a trustee of the Trust since 1997
and a senior vice president and managing director of CAM and CFS.


 64
CALAMOS FAMILY OF FUNDS
<PAGE>   75
                                                                      Fund Facts
                                                                  [CALAMOS ICON]

HOW CAN I BUY SHARES?
--------------------------------------------------------------------------------


This prospectus offers three classes of shares, Class A, Class B and Class C.
The different classes of shares are investments in the same portfolio of
securities, but each class of shares has different expenses and will likely have
different share prices.



You may purchase Fund shares in any of the following ways:



<TABLE>
<S>                <C>
Class A Shares     The offering price of a Class A share is the net
                   asset value plus an initial sales charge. The
                   maximum sales charge is 4.75% of the offering price.
                   Reduced sales charges are available for purchases of
                   $50,000 or more. A .25% distribution fee (Rule
                   12b-1, explained below) is also applied to Class A
                   shares.

Class B Shares     The offering price of a Class B share is the net
                   asset value with no initial sales charge. A 1.00%
                   distribution fee and a contingent deferred sales
                   charge of up to 5.00% on shares sold within six
                   years of purchase (falling to zero after six years)
                   are applied to Class B shares. The charge will not
                   be applied to the purchase of shares from the
                   reinvestment of dividends or capital gains
                   distributions. Class B shares automatically convert
                   to Class A shares after eight years, which means
                   lower annual expenses at that point forward.

Class C Shares     The offering price of a Class C share is the net
                   asset value with no initial sales charge. A 1.00%
                   distribution fee and a 1% contingent deferred sales
                   charge on shares sold within one year of purchase
                   are applied to Class C shares. The charge will not
                   be applied to the purchase of shares from the
                   reinvestment of dividends or capital gains
                   distributions. Class C shares have a lower
                   contingent deferred sales charge than Class B
                   shares, but Class C shares DO NOT convert to Class A
                   shares.
</TABLE>



You may buy shares of the Funds by contacting the securities broker-dealer or
other financial services firm who gave you this prospectus. When you buy shares,
be sure to specify whether you want Class A, Class B or Class C shares.



The table above summarizes the main differences among Class A, Class B and Class
C shares, which lie primarily in their initial and contingent deferred sales
charge structures and their distribution fees. Each class has distinct
advantages

CALAMOS FAMILY OF FUNDS                                                       65
<PAGE>   76

Fund Facts
[CALAMOS ICON]

RIGHT OF ACCUMULATION -- you can pay the sales charge that applies to the higher
of the cost or value of your CALAMOS FAMILY OF FUNDS shares owned.
LETTER OF INTENT -- you can pay the sales charge that applies to the total of
all the CALAMOS FAMILY OF FUNDS shares you agree to buy within a 13-month
period.

and disadvantages for different investors, and you may choose the class that
best suits your circumstances and objectives.

DISTRIBUTION AND SERVICE (RULE 12b-1) PLAN


The Funds have a Distribution and Service Plan or "12b-1 Plan". Under the plan,
Class A shares pay a distribution and service fee of .25% of the average daily
net assets of the class. Class B and Class C shares pay a service fee of .25%
and a distribution fee of .75%.


Since the Fund's assets are used to pay 12b-1 fees on an ongoing basis, over
time these fees will increase the cost of your investment and may cost you more
than other types of sales charges. Consequently, long-term shareholders
eventually may pay more than the economic equivalent of the maximum initial
charges permitted by the National Association of Securities Dealers (NASD).

HOW MUCH DOES IT COST TO BUY CLASS A SHARES?

Class A shares are sold at the net asset value per share plus an initial sales
charge. The sales charge varies depending on the amount of your purchase, as
follows:

<TABLE>
<CAPTION>
                                                 SALES CHARGE
                                         ----------------------------
                                           AS A % OF      AS A % OF
                                          NET AMOUNT       OFFERING
                                           INVESTED         PRICE
---------------------------------------------------------------------
<S>                                      <C>             <C>
 LESS THAN $50,000                           4.99%          4.75%
---------------------------------------------------------------------
 $50,000 BUT LESS THAN $100,000               4.44           4.25
---------------------------------------------------------------------
 $100,000 BUT LESS THAN $250,000              3.63           3.50
---------------------------------------------------------------------
 $250,000 BUT LESS THAN $500,000              2.56           2.50
---------------------------------------------------------------------
 $500,000 BUT LESS THAN $1,000,000            2.04           2.00
---------------------------------------------------------------------
 $1,000,000 OR MORE                          NONE*          NONE*
---------------------------------------------------------------------
</TABLE>

* Redemption of shares may be subject to a contingent deferred sales charge as
  discussed below.

HOW CAN I REDUCE SALES CHARGES FOR CLASS A PURCHASES?

RIGHTS OF ACCUMULATION.  If you already own shares in a Fund, you may add the
value of those shares to the value of any new investment. Then, the sales charge
for the new shares will be figured at the rate in the table above that applies
to the combined value of your current and new investment. To
 66
CALAMOS FAMILY OF FUNDS
<PAGE>   77
                                                                      Fund Facts
                                                                  [CALAMOS ICON]

NET ASSET VALUE -- the dollar value of a single mutual fund share based on the
market value of the Fund's total assets after deducting liabilities, divided by
the number of shares outstanding.

determine the value of the shares of your current investment, you can use either
the current public offering price or the actual price you paid, whichever is
greater.

STATEMENT OF INTENTION.  You can purchase additional Class A shares of any of
the Funds over a 13-month period and receive the same sales charge as if you had
purchased all the shares at once under a Letter of Intent. A Letter of Intent
does not obligate you to purchase or sell additional Class A shares. A price
adjustment is made according to the actual amount purchased within the 13-month
period.


$1,000,000 PURCHASE ORDER.  You may purchase Class A shares of a Fund at net
asset value without a sales charge provided that the total amount invested in
the Fund or other Funds totals at least $1,000,000. With a $1,000,000 purchase
order, you will pay a contingent deferred sales charge of 1% on shares that are
sold within one year after purchase or (if the shares were purchased after July
31, 2000) .50% on shares that are sold during the second year after purchase,
excluding shares purchased from the reinvestment of dividends or capital gains
distributions.


HOW CAN I PURCHASE CLASS A SHARES WITHOUT A SALES CHARGE?

Class A shares of a Fund may be purchased at net asset value, with no initial
sales charge, under the following scenarios:

(a) any investor buying shares that have been recommended by an investment
consultant to whom you pay a fee for services relating to investment selection;

(b) any investor buying shares through an investment advisory account with
CALAMOS ASSET MANAGEMENT, INC. or through a brokerage account with CALAMOS
FINANCIAL SERVICES, INC. (CFS) over which CFS has investment discretion;

(c) any investor buying shares in a non-discretionary, non-advisory,
asset-based-fee brokerage account of a broker-dealer having a selling group
agreement with CFS;


(d) any investor buying shares by exchange of Cash Account Shares or Summit Fund
Shares previously purchased through use of the exchange privilege;


(e) any employee benefit plan having more than 200 eligible employees or a
minimum of $1 million of plan assets invested in the Funds;

CALAMOS FAMILY OF FUNDS                                                       67
<PAGE>   78
Fund Facts
[CALAMOS ICON]

(f) any employee benefit plan buying shares through an intermediary that has
signed a participation agreement with CFS specifying certain asset minimums and
qualifications, and marketing, program and trading restrictions;

(g) any insurance company separate account used to fund annuity contracts for
employee benefit plans having a total of more than 200 eligible employees or a
minimum of $1 million of plan assets invested in the Funds;

(h) any employee or registered representative of CFS, one of its affiliates or a
broker-dealer with a selling group agreement with CFS;

(i) any trustee of the Trust;

(j) any member of the immediate family of a person qualifying under (h) or (i),
including a spouse, child, stepchild, sibling, parent, stepparent, grandchild
and grandparent, in each case including in-law and adoptive relationships;

(k) any trust, pension, profit sharing, or other benefit plan in which any
person qualifying under (h) is a participant;

(l) any 401(k) plan (cash or deferred arrangement intended to qualify under
section 401(k) of the Internal Revenue Code) or other qualified retirement plan
to which a person qualifying under (h), (i) or (j) makes voluntary contributions
into his or her own account, investing with self direction

(m) any company exchanging shares with a Fund pursuant to a merger, acquisition
or exchange offer;


(n) any investor buying shares with the proceeds of shares sold in the prior 12
months from a mutual fund on which an initial sales charge or contingent
deferred sales charge was paid; or



(o) any investor buying shares through a brokerage account with a broker-dealer
who has waived the initial sales charge to which the broker-dealer otherwise
would be entitled.


In addition, Class A shares of the Convertible Fund may be bought without an
initial sales charge by any shareholder of the Convertible Fund who has been a
shareholder since April 30, 1992.


CLASS B SHARES



With Class B shares, you pay no initial sales charge, but the Fund pays a
distribution and service fee at the annual rate of 1.00% of average net assets.
As


 68
CALAMOS FAMILY OF FUNDS
<PAGE>   79

                                                                      Fund Facts
                                                                  [CALAMOS ICON]

TRANSFER AGENT -- maintains the Fund's shareholder records including purchases,
sales and account balances.


a result, the annual expenses for Class B shares are somewhat higher compared to
Class A shares, which pay a .25% distribution and service fee. After eight
years, Class B shares automatically convert to Class A, which has the effect of
lowering the annual expenses from the ninth year on.



Class B shares have a contingent deferral sales charge that declines over the
years you own shares, and disappears completely after six years of ownership.
For any shares you sell within those six years, you may be charged at the
following rates based on the lesser of the redemption price or purchase price:



<TABLE>
<CAPTION>
YEAR AFTER YOU BOUGHT SHARES  CONTINGENT DEFERRED SALES CHARGE
<S>                           <C>

First year                                 5.00%
Second year                                4.00%
Third or fourth year                       3.00%
Fifth year                                 2.00%
Sixth year                                 1.00%
</TABLE>


HOW CAN I SELL SHARES?
--------------------------------------------------------------------------------

THROUGH YOUR BROKER-DEALER (CERTAIN CHARGES MAY APPLY)

Shares held for you in your broker-dealer's name must be sold through the
broker-dealer.

WRITING TO THE FUND'S TRANSFER AGENT


As a shareholder, you may request a Fund to redeem your shares. When the shares
are held for you by the Funds' transfer agent, you may sell your shares by
sending a written request with signatures guaranteed to: First Data Investor
Services Group, Inc., 211 South Gulph Road, P.O. Box 61767, King of Prussia, PA
19406. You may redeem your shares by written request without a signature
guarantee, provided that the proceeds of the redemption are not more than
$50,000 and they are to be sent to the registered holder at the address of
record. If you hold physical certificates for your shares, they must be endorsed
and mailed to or deposited with First Data Investor Services Group along with a
written request for redemption. Under certain circumstances, before shares can
be sold, additional documents may be required in order to verify the authority
of the person who is selling the shares.



TELEPHONE REDEMPTIONS



If you have elected the telephone redemption privilege you may redeem your
shares by telephone. With the telephone redemption option, you may sell up to


CALAMOS FAMILY OF FUNDS                                                       69
<PAGE>   80

Fund Facts
[CALAMOS ICON]

$50,000 worth of shares on any day. You may not redeem by telephone shares held
in an IRA account or in an account for which you have changed the address within
the preceding 30 days.



During periods of volatile economic and market conditions, you may have
difficulty making a redemption request by telephone, in which case you should
make your redemption request in writing.



To permit telephone redemptions, you must authorize telephone redemption on your
account application prior to calling us with your redemption request. Call us at
800.823.7386 to obtain an account application with the telephone redemption
option. If you did not authorize telephone redemption on your original account
application, you may request telephone redemption by submitting a request in
writing with a signature guarantee. If you want redemption proceeds paid by wire
transfer to your bank account, send your request for telephone redemption, along
with a voided check, to First Data Investor Services Group, Inc., 211 South
Gulph Road, P.O. Box 61767, King of Prussia, PA 19406.



To redeem shares from your account by telephone, call 800.823.7386. We will send
your redemption proceeds to you by check or, by wire to a predetermined bank or
brokerage account. Redemption proceeds paid by wire will normally be sent on the
next business day after receipt of the redemption request and the cost of the
wire (currently $9.00) will be deducted from the redemption proceeds. A
redemption request received after 4 p.m. eastern time (or after the close of
regular session trading on the New York Stock Exchange ("NYSE") if the NYSE
closes before 4 p.m.) will be deemed received on the next business day.



To reduce the risk of fraudulent instruction and to ensure that instructions
communicated by telephone are genuine, we will send your redemption proceeds
only to the address or bank/brokerage account as shown on our records. We also
may record a call, request more information and send written confirmation of
telephone transactions. We (and our transfer agent) will not be responsible for
the authenticity of instructions provided by telephone, nor for any loss,
liability, cost or expense for acting upon instructions furnished by telephone
if we reasonably believe that such instructions are genuine. If we do not follow
reasonable procedures for protecting shareholders against loss on telephone
redemptions, we may be liable for any loss due to unauthorized or fraudulent
instructions. Please verify the accuracy of each telephone transaction as soon
as you receive your confirmation statement.


 70
CALAMOS FAMILY OF FUNDS
<PAGE>   81
                                                                      Fund Facts
                                                                  [CALAMOS ICON]

PROCESSING TIME

A check for the proceeds from the sale will not be sent to you until the check
used to purchase the shares has cleared, which can take up to 15 days after
purchase. You may avoid this delay by buying shares with a wire transfer of
funds. A Fund may suspend the right of redemption under certain extraordinary
circumstances in accordance with the rules of the Securities and Exchange
Commission.


REDEMPTION FEE



When you sell your shares, each Fund will deduct a redemption fee of 1.00% of
the redemption amount for shares held six months or less. This fee is paid to
the Fund and is designed to offset the brokerage commissions, market impact, and
other costs associated with fluctuations in Fund asset levels and cash flow
caused by shareholder trading. If you bought shares on different days, the
shares you held longest will be redeemed first for purposes of determining the
redemption fee. The redemption fee does not apply to shares that were acquired
through reinvestment of distributions.


SMALL ACCOUNTS

Due to the relatively high cost of handling small accounts, each Fund may give
you 30 days' written notice that it intends to buy your shares, at net asset
value, if your account has a value of less than $500. This would not apply if
your account value declined to less than $500 as a result of market fluctuation.

ONCE YOUR INSTRUCTIONS TO SELL SHARES OF THE FUNDS HAVE BEEN RECEIVED, YOU MAY
NOT CANCEL OR REVOKE YOUR REQUEST. IT IS THEREFORE, VERY IMPORTANT THAT YOU CALL
US IF YOU HAVE ANY QUESTIONS ABOUT THE REQUIREMENTS FOR SELLING SHARES BEFORE
SUBMITTING YOUR REQUEST.

TRANSACTION INFORMATION
--------------------------------------------------------------------------------


SHARE PRICE


Each Fund's share price, or net asset value (NAV) is determined as of the close
of regular session trading on the New York Stock Exchange (NYSE) (currently 4:00
p.m. Eastern Time) each day that the Exchange is open. The NYSE is regularly
closed on New Year's Day, the third Monday in January and February, Good Friday,
the last Monday in May, Independence Day, Labor Day, Thanksgiving and Christmas.

CALAMOS FAMILY OF FUNDS                                                       71
<PAGE>   82
Fund Facts
[CALAMOS ICON]

SIGNATURE GUARANTEE -- an authentication of a signature in the form of a stamp
or seal by a bank, stock exchange member or other acceptable guarantor (not a
Notary Public).


The NAV per share for each class of shares of a Fund is calculated by dividing
the value of all of the securities and other assets of that class of shares of
the Fund, less its liabilities, by the number of shares outstanding for that
class of Fund shares. When shares are purchased or sold, the order is processed
at the next NAV that is calculated on any day the NYSE is open for trading,
after receiving a purchase or sale order. The values of the securities in the
Fund are based on market prices from the primary market in which they are
traded. As a general rule, equity securities listed on a U.S. securities
exchange or NASDAQ National Market are valued at the last quoted sale price on
the day the valuation is made. Bonds and other fixed-income securities that are
traded over the counter and on an exchange will be valued according to the
broadest and most representative market, and it is expected this will ordinarily
be the over-the-counter market.


The foreign securities held by a Fund are traded on exchanges throughout the
world. Trading on these foreign securities exchanges is completed at various
times throughout the day and often does not coincide with the close of trading
on the NYSE. The value of foreign securities is determined at the close of
trading of the exchange on which the securities are traded or at the close of
trading on the NYSE, whichever is earlier. As a result, it is possible that
events affecting the value of such securities may occur that are not reflected
in the computation of the Fund's NAV, and the NAV may change on days when you
will not be able to buy or sell the Fund's shares.

If market prices are not readily available, securities and other assets are
priced at a fair value as determined by the board of trustees. Any fair value
pricing will be based on what the board believes is the current and true price
of the security rather than the last quoted price of the security.


EXCHANGE PRIVILEGE.  You may exchange Class A shares of a Fund for Class A
shares of another Fund with no sales charge. Class B shares of a Fund can be
exchanged for Class B shares of another Fund with no contingent deferred sales
charge. Class C shares of a Fund can also be exchanged for Class C shares of
another Fund with no contingent deferred sales charge. YOU MAY NOT MAKE MORE
THAN FOUR EXCHANGES FROM ANY FUND DURING ANY CALENDAR YEAR. AN EXCHANGE
TRANSACTION IS CONSIDERED A SALE AND PURCHASE OF SHARES FOR FEDERAL INCOME TAX
PURPOSES AND MAY RESULT IN CAPITAL GAIN OR LOSS.


WHERE CAN I HAVE MY SIGNATURE GUARANTEED?


As discussed above, with certain written requests to sell shares, each person
signing must have their signature guaranteed. You can obtain a signature


 72
CALAMOS FAMILY OF FUNDS
<PAGE>   83
                                                                      Fund Facts
                                                                  [CALAMOS ICON]

guarantee from most brokerage houses, including CFS, and financial institutions.

WHAT IS THE MINIMUM AMOUNT I CAN INVEST IN THE FUNDS?

The minimum initial investment for each Fund is $500. Additional minimum
investments can be made for $50 or more.

PURCHASE RESTRICTIONS

We reserve the right to reject any order for the purchase of shares in whole or
in part, and to suspend the sale of shares to the public in response to
conditions in the securities markets or otherwise.

BROKER TRANSACTIONS

If you buy and sell shares of a Fund through a member of the National
Association of Securities Dealers, Inc. other than CFS, the Funds' distributor,
that member may charge a fee for that service. Please read this prospectus along
with any material describing fees and services that the member firm may charge.

REDEMPTION-IN-KIND

The Funds reserve the right to honor any request for sales or repurchase by
paying you with readily marketable securities, either in whole or in part. This
is considered a "redemption-in-kind". The Fund will choose these securities and
value them in the same way as they are valued for purposes of computing the
Fund's net asset value. You may incur transaction expenses if you convert these
securities to cash.

DISTRIBUTIONS AND TAXES
--------------------------------------------------------------------------------

DIVIDENDS AND CAPITAL GAINS DISTRIBUTIONS


You may receive two kinds of distributions from a Fund: dividends and capital
gains distributions. Unless you requested on the account application or in
writing that distributions be made in cash, all dividends and capital gains
distributions are paid by crediting you with additional shares of the Fund of
the same class you already own. These shares are valued at the next net asset
value per share that is computed after the dividend or distribution date. There
is no sales charge applied. The Convertible Fund, Convertible Growth and Income
Fund, Market Neutral Fund, Global Convertible Fund, High Yield Fund, and


CALAMOS FAMILY OF FUNDS                                                       73
<PAGE>   84
Fund Facts
[CALAMOS ICON]

DIVIDENDS -- income paid to shareholders as cash or reinvested in additional
Fund shares as they are paid.

DISTRIBUTIONS -- payment of a dividend or capital gain to shareholders as cash
or reinvested in the Fund as they are paid.


Global Convertible Technology Fund each declares and pays dividends from net
investment income quarterly; the Growth Fund declares dividends annually. Net
realized long-term capital gains, if any, are paid to shareholders by each Fund
at least annually.


If two consecutive dividend checks from a Fund are returned undeliverable, those
dividends will be invested in additional shares of that Fund at the current net
asset value and the account will be designated as a dividend reinvestment
account.

TAXES

You may realize a capital gain or capital loss when you sell (redeem) shares.
The federal tax treatment will depend, of course, on how long you owned the
shares and on your individual tax position. You may be subject to state and
local taxes on your investment in a Fund, depending on the laws of your home
state and locality.

The dividends and distributions paid by a Fund are subject to taxation as of the
date of payment, except for those distributions declared in October, November or
December. If you are a shareholder of record during one of those months, for tax
purposes, your distributions will be treated as though it were received on
December 31 of the year in which they are declared, provided they are paid prior
to February 1 of the next year.


You may be taxed for dividends from net investment income and capital gains
distributions at different rates depending on your tax situation. Annually, we
will advise you of the source of your distributions for tax purposes.


 74
CALAMOS FAMILY OF FUNDS
<PAGE>   85

<TABLE>
<S>          <C>
[FINANCIAL   Financial Highlights
HIGHLIGHTS
     ICON]
</TABLE>


The tables below are intended to help you understand the Funds' financial
performance for the period shown below for both Class A and Class C shares,
except for Global Convertible Technology Fund, which is expected to commence
operations on or about August 1, 2000. Class B shares of each Fund are expected
to commence operations on or about August 1, 2000. Certain information reflects
financial results for a single Fund share. The Total Return figures show what an
investor in a Fund would have earned (or lost) if all distributions had been
reinvested. This information has been audited by Ernst & Young LLP whose report,
along with the Funds' financial statements, are included in the Funds' annual
report, which is available upon request.


CONVERTIBLE FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                             CLASS A SHARES
                                             -----------------------------------------------
                                                          YEAR ENDED MARCH 31,
                                             -----------------------------------------------
                                              2000      1999      1998      1997      1996
--------------------------------------------------------------------------------------------
<S>                                          <C>       <C>       <C>       <C>       <C>
 NET ASSET VALUE, BEGINNING OF PERIOD        $         $ 17.43   $ 14.68   $ 14.49   $ 12.41
 INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                   .41       .49       .36       .40
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                          .09      3.92      1.39      3.06
                                             -------   -------   -------   -------   -------
   TOTAL FROM INVESTMENT OPERATIONS                        .50      4.41      1.75      3.46
--------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                   (.41)     (.61)     (.45)     (.31)
   DIVIDENDS FROM NET REALIZED CAPITAL
   GAINS                                                  (.38)     (.95)    (1.11)    (1.07)
   DIVIDENDS IN EXCESS OF NET REALIZED
   CAPITAL GAINS                                            --        --        --        --
   DISTRIBUTIONS FROM PAID IN CAPITAL                       --      (.10)       --        --
                                             -------   -------   -------   -------   -------
   TOTAL DISTRIBUTIONS                                    (.79)    (1.66)    (1.56)    (1.38)
--------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD              $         $ 17.14   $ 17.43   $ 14.68   $ 14.49
--------------------------------------------------------------------------------------------
 TOTAL RETURN (a)                                   %      3.2%     31.4%     12.9%     28.8%
--------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)           $         $67,456   $62,157   $35,950   $24,460
   RATIO OF EXPENSES TO AVERAGE NET ASSETS          %      1.4%      1.4%      1.5%      1.5%
   RATIO OF NET INVESTMENT INCOME TO
   AVERAGE NET ASSETS                               %      2.6%      3.3%      2.8%      3.0%
--------------------------------------------------------------------------------------------
</TABLE>


CALAMOS FAMILY OF FUNDS                                                       75
<PAGE>   86
Financial Highlights
[ICON]

CONVERTIBLE FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                                     CLASS C SHARES
                                                           -----------------------------------
                                                       YEAR ENDED MARCH 31             7/5/96
                                                 -------------------------------       THROUGH
                                                  2000      1999          1998         3/31/97
----------------------------------------------------------------------------------------------
<S>                                              <C>       <C>           <C>           <C>
 NET ASSET VALUE, BEGINNING OF PERIOD            $         $ 17.38       $ 14.63       $13.87
 NET INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                       .31           .40          .30
   NET REALIZED AND UNREALIZED GAIN
   ON INVESTMENTS                                              .11          3.92         1.21
                                                 -------   -------
   TOTAL FROM INVESTMENT OPERATIONS                            .42          4.32         1.51
-----------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                       (.35)         (.52)        (.25)
   DIVIDENDS FROM NET REALIZED CAPITAL
   GAINS                                                      (.38)         (.95)        (.50)
                                                 -------   -------
   DISTRIBUTIONS FROM PAID IN CAPITAL                           --          (.10)          --
                                                 -------   -------
   TOTAL DISTRIBUTIONS                                        (.73)        (1.57)        (.75)
-----------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                  $         $ 17.07       $ 17.38       $14.63
-----------------------------------------------------------------------------------------------
 TOTAL RETURN (a)                                       %      2.7%         30.8%        11.1%
-----------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)               $         $30,843       $14,358       $3,094
   RATIO OF EXPENSES TO AVERAGE NET ASSETS              %      1.9%          2.0%         2.0%*
   RATIO OF NET INVESTMENT INCOME TO
   AVERAGE NET ASSETS                                   %      2.1%          3.0%         2.7%*
-----------------------------------------------------------------------------------------------
</TABLE>


<TABLE>
<CAPTION>
                                                                 YEAR ENDED MARCH 31,
                                                -------------------------------------------------------
                                                 2000        1999        1998        1997        1996
-------------------------------------------------------------------------------------------------------
<S>                                             <C>         <C>         <C>         <C>         <C>
 PORTFOLIO TURNOVER RATE                              %       78.2%       76.0%       52.3%       65.2%
-------------------------------------------------------------------------------------------------------
</TABLE>

(a)  Total return is not annualized and does not reflect the effect of sales
     charges.

*  Annualized

 76
CALAMOS FAMILY OF FUNDS
<PAGE>   87

                                                            Financial Highlights
                                                                          [ICON]

CONVERTIBLE GROWTH AND INCOME FUND

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


<TABLE>
<CAPTION>
                                                              CLASS A SHARES
                                               ---------------------------------------------
                                                           YEAR ENDED MARCH 31,
                                               ---------------------------------------------
                                                2000      1999      1998      1997     1996
--------------------------------------------------------------------------------------------
<S>                                            <C>       <C>       <C>       <C>      <C>
 NET ASSET VALUE, BEGINNING OF PERIOD          $         $ 18.59   $ 15.52   $15.62   $12.68
 NET INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                     .39       .34      .34      .37
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                            .79      5.14     1.52     3.70
                                               -------   -------   -------
   TOTAL FROM INVESTMENT OPERATIONS                         1.18      5.48     1.86     4.07
--------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                     (.39)     (.41)    (.28)    (.42)
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS               (1.16)    (2.00)   (1.68)    (.71)
                                               -------   -------   -------
   TOTAL DISTRIBUTIONS                                     (1.55)    (2.41)   (1.96)   (1.13)
--------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                $         $ 18.22   $ 18.59   $15.52   $15.62
--------------------------------------------------------------------------------------------
 TOTAL RETURN (b)                                     %      6.9%     37.8%    12.9%    33.0%
--------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)             $         $18,981   $13,119   $8,408   $5,813
   RATIO OF EXPENSES TO AVERAGE NET ASSETS
   (a)                                                %      2.0%      2.0%     2.0%     2.0%
   RATIO OF NET INVESTMENT INCOME TO AVERAGE
   NET ASSETS (a)                                     %      2.3%      2.0%     2.4%     2.6%
--------------------------------------------------------------------------------------------
</TABLE>


CALAMOS FAMILY OF FUNDS                                                       77
<PAGE>   88

Financial Highlights
[ICON]

CONVERTIBLE GROWTH AND INCOME FUND

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


<TABLE>
<CAPTION>
                                                                  CLASS C SHARES
                                                    ------------------------------------------
                                                                YEAR
                                                               ENDED
                                                              MARCH 31                 8/5/96
                                                    ----------------------------       THROUGH
                                                     2000     1999         1998        3/31/97
----------------------------------------------------------------------------------------------
<S>                                                 <C>      <C>          <C>          <C>
 NET ASSET VALUE, BEGINNING OF PERIOD               $        $18.48       $15.50       $14.52
 NET INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                        .28          .26          .26
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                               .82         5.11         1.30
                                                    ------   ------       ------
   TOTAL FROM INVESTMENT OPERATIONS                            1.10         5.37         1.56
-----------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                        (.34)        (.39)        (.25)
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS                  (1.17)       (2.00)        (.33)
                                                             ------       ------       ------
   TOTAL DISTRIBUTIONS                                         1.51        (2.39)        (.58)
-----------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                     $        $18.07       $18.48       $15.50
-----------------------------------------------------------------------------------------------
 TOTAL RETURN (b)                                         %     6.5%        37.1%        10.8%
-----------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)                  $        $2,676       $1,379       $  330
   RATIO OF EXPENSES TO AVERAGE NET ASSETS (c)            %     2.4%         2.5%         2.5%*
   RATIO OF NET INVESTMENT INCOME TO
   AVERAGE NET ASSETS (c)                                 %     1.9%         1.5%         2.4%*
-----------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                                 YEAR ENDED MARCH 31,
                                                ------------------------------------------------------
                                                 2000        1999        1998        1997        1996
------------------------------------------------------------------------------------------------------
<S>                                             <C>         <C>         <C>         <C>         <C>
 PORTFOLIO TURNOVER RATE                              %       87.5%      115.5%       91.5%       86.4%
------------------------------------------------------------------------------------------------------
</TABLE>



(a)  After reimbursement and waiver of expenses by CAM equivalent to     %,
     0.0%, 0.0%, 0.1%, and 0.1%, of average net assets, respectively.


(b)  Total return is not annualized and does not reflect the effect of sales
     charges.


(c)  After reimbursement and waiver of expenses by CAM equivalent to     % 0.0%,
     0.0% and 0.6%* of average net assets, respectively.


*  Annualized

 78
CALAMOS FAMILY OF FUNDS
<PAGE>   89
                                                            Financial Highlights
                                                                          [ICON]

MARKET NEUTRAL FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                                CLASS A SHARES
                                                  ------------------------------------------
                                                             YEAR ENDED MARCH 31,
                                                  ------------------------------------------
                                                   2000     1999     1998     1997     1996
--------------------------------------------------------------------------------------------
<S>                                               <C>      <C>      <C>      <C>      <C>
 NET ASSET VALUE, BEGINNING OF PERIOD                  $   $11.91   $10.81   $11.07   $10.13
 INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                      .32      .50      .50      .53
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                             .67     1.19      .29      .83
                                                  ------   ------   ------   ------   ------
   TOTAL FROM INVESTMENT OPERATIONS                           .99     1.69      .79     1.36
--------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                      (.32)    (.55)    (.68)    (.42)
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS                 (.86)    (.04)    (.37)      --
                                                  ------   ------   ------   ------   ------
   TOTAL DISTRIBUTIONS                                      (1.18)    (.59)   (1.05)    (.42)
--------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                        $   $11.72   $11.91   $10.81   $11.07
--------------------------------------------------------------------------------------------
 TOTAL RETURN (c)                                       %     8.7%    15.7%     7.4%    13.6%
--------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)                     $   $2,089   $1,123   $1,317   $1,620
   RATIO OF EXPENSES TO AVERAGE NET ASSETS
   (a)(b)                                               %     2.1%     2.1%     2.1%     2.2%
   RATIO OF NET INVESTMENT INCOME TO AVERAGE NET
   ASSETS (a)                                           %     3.1%     3.9%     4.3%     4.6%
   PORTFOLIO TURNOVER RATE                              %   192.9%   398.2%   152.5%    81.1%
--------------------------------------------------------------------------------------------
</TABLE>



(a)  After reimbursement and waiver of expenses by CAM equivalent to
         %,(4.3)%, 4.1%, 3.0%, and 1.6%*, of average net assets, respectively.



(b)  Includes     %, 0.1%, 0.1%, 0.1%, and 0.2%* respectively, related to
     dividend expenses on short positions.


(c)  Total return is not annualized and does not reflect the effect of sales
     charges.

*  Annualized.

CALAMOS FAMILY OF FUNDS                                                       79
<PAGE>   90
Financial Highlights
[ICON]

MARKET NEUTRAL FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                           CLASS C SHARES
---------------------------------------------------------------------
                                                              2/16/00
                                                               THRU
                                                              3/31/00
---------------------------------------------------------------------
<S>                                                           <C>
 NET ASSET VALUE, BEGINNING OF PERIOD                              $
 INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS
                                                              ------
   TOTAL FROM INVESTMENT OPERATIONS
---------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS
                                                              ------
   TOTAL DISTRIBUTIONS
---------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                                    $
---------------------------------------------------------------------
 TOTAL RETURN (c)                                                   %
---------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)                                 $
   RATIO OF EXPENSES TO AVERAGE NET ASSETS (a)(b)                   %*
   RATIO OF NET INVESTMENT INCOME TO AVERAGE
   NET ASSETS (a)                                                   %*
   PORTFOLIO TURNOVER RATE                                          %
---------------------------------------------------------------------
</TABLE>



(a)  After reimbursement and waiver of expenses by CAM equivalent to     %* of
     average net assets.



(b)  Includes     %* related to dividend expenses on short positions.


(c)  Total return is not annualized and does not reflect the effect of sales
     charges.

*  Annualized.

 80
CALAMOS FAMILY OF FUNDS
<PAGE>   91
                                                            Financial Highlights
                                                                          [ICON]

GROWTH FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                             CLASS A SHARES
                                              ---------------------------------------------
                                                          YEAR ENDED MARCH 31,
                                              ---------------------------------------------
                                               2000      1999      1998      1997     1996
----------------------------------------------------------------------------------
<S>                                           <C>       <C>       <C>       <C>      <C>
 NET ASSET VALUE, BEGINNING OF PERIOD         $          $20.06    $17.04   $15.74   $14.18
 INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME (LOSS)                            (.30)     (.01)    (.09)    (.09)
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                          3.75      8.53     3.14     4.69
                                                        -------   -------   ------
   TOTAL FROM INVESTMENT OPERATIONS                        3.45      8.52     3.05     4.60
-------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET INVESTMENT INCOME                      --        --       --     (.07)
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS                 --     (5.32)   (1.75)   (2.97)
   DISTRIBUTIONS FROM PAID IN CAPITAL                        --      (.18)      --       --
                                                        -------   -------   ------
   TOTAL DISTRIBUTIONS                                       --      5.50    (1.75)   (3.04)
-------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD               $          $23.51    $20.06   $17.04   $15.74
-------------------------------------------------------------------------------------------
 TOTAL RETURN (b)                                    %     17.2%     54.0%    19.1%    35.2%
-------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)            $         $13,553   $10,374   $6,635   $2,866
   RATIO OF EXPENSES TO AVERAGE NET ASSETS
   (a)                                               %      2.0%      2.0%     2.0%     2.0%*
   RATIO OF NET INVESTMENT INCOME TO
   AVERAGE NET ASSETS (a)                                  (1.6)%    (1.5)%   (1.3)%   (0.8)%
-------------------------------------------------------------------------------------------
</TABLE>


CALAMOS FAMILY OF FUNDS                                                       81
<PAGE>   92
Financial Highlights
[ICON]

GROWTH FUND
--------------------------------------------------------------------------------


<TABLE>
<CAPTION>
                                                                  CLASS C SHARES
                                                    ------------------------------------------
                                                        YEAR ENDED MARCH 31,           9/3/96
                                                    ----------------------------       THROUGH
                                                     2000     1999         1998        3/31/97
--------------------------------------------------------------------------------
<S>                                                 <C>      <C>          <C>          <C>
 NET ASSET VALUE, BEGINNING OF PERIOD                    $   $19.85       $16.98       $17.63
 NET INCOME FROM INVESTMENT OPERATIONS:
   NET INVESTMENT INCOME                                       (.11)        (.13)        (.07)
   NET REALIZED AND UNREALIZED GAIN (LOSS)
   ON INVESTMENTS                                              3.44         8.50         1.07
                                                    ------   ------       ------       ------
   TOTAL FROM INVESTMENT OPERATIONS                            3.33         8.37         1.00
-------------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET REALIZED CAPITAL GAINS                     --        (5.32)       (1.65)
   DISTRIBUTIONS FROM PAID IN CAPITAL                            --         (.18)          --
                                                    ------   ------       ------       ------
   TOTAL DISTRIBUTIONS                                           --        (5.50)       (1.65)
-------------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF PERIOD                          $   $23.18       $19.85       $16.98
-------------------------------------------------------------------------------------------------
 TOTAL RETURN (b)                                         %    16.8%        53.3%         5.4%
-------------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD (000)                       $     $308          $41           $8
   RATIO OF EXPENSES TO AVERAGE NET ASSETS (c)            %     2.5%         2.5%         2.5%*
   RATIO OF NET INVESTMENT INCOME TO
   AVERAGE NET ASSETS (c)                                $     (2.1)%       (2.0)%       (1.9)%*
-------------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                                 YEAR ENDED MARCH 31,
                                                ------------------------------------------------------
                                                 2000        1999        1998        1997        1996
------------------------------------------------------------------------------------------------------
<S>                                             <C>         <C>         <C>         <C>         <C>
 PORTFOLIO TURNOVER RATE                              %      184.3%      206.1%      173.9%      252.4%
------------------------------------------------------------------------------------------------------
</TABLE>



(a)  After reimbursement and waiver of expenses by CAM equivalent to      %,
     (0.4)%, 0.3%, 0.7%and 1.2%* of average net assets, respectively.


(b)  Total return is not annualized and does not reflect the effect of sales
     charges.


(c)  After reimbursement and waiver of expenses by CAM equivalent to       %,
     0.5%, 0.4% and 0.6%* of average net assets, respectively.


*  Annualized.

 82
CALAMOS FAMILY OF FUNDS
<PAGE>   93

                                                            Financial Highlights
                                                                          [ICON]

GLOBAL CONVERTIBLE FUND

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


<TABLE>
<CAPTION>
                                          CLASS A SHARES                      CLASS C SHARES
                                ----------------------------------   ---------------------------------
                                          YEAR                                YEAR
                                    ENDED MARCH 31,        9/9/96        ENDED MARCH 31,       9/24/96
                                ------------------------   THROUGH   -----------------------   THROUGH
                                 2000     1999     1998    3/31/97    2000     1999    1998    3/31/97
------------------------------------------------------------------------------------------------------
<S>                             <C>      <C>      <C>      <C>       <C>       <C>     <C>     <C>
 NET ASSET VALUE, BEGINNING OF
 PERIOD                         $        $ 6.56   $ 5.39   $ 5.00    $         $6.53   $5.37    $5.00
 NET INCOME FROM INVESTMENT
 OPERATIONS:
   NET INVESTMENT INCOME                    .02      .17      .04                .01     .15      .03
   NET REALIZED AND UNREALIZED
   GAIN (LOSS)
   ON INVESTMENTS                           .29     1.42      .36                .27    1.41      .35
                                         ------   ------   ------              -----   -----    -----
   TOTAL FROM INVESTMENT
    OPERATIONS                              .31     1.59      .40                .28    1.56      .38
------------------------------------------------------------------------------------------------------
 LESS DISTRIBUTIONS:
   DIVIDENDS FROM NET
   INVESTMENT INCOME                       (.13)    (.28)    (.01)              (.11)   (.26)    (.01)
   DIVIDENDS FROM NET REALIZED
   CAPITAL GAINS                           (.13)    (.14)      --               (.13)   (.14)      --
                                         ------   ------   ------              -----   -----    -----
   TOTAL DISTRIBUTIONS                     (.26)    (.42)    (.01)              (.24)   (.40)    (.01)
------------------------------------------------------------------------------------------------------
 NET ASSET VALUE, END OF
 PERIOD                         $        $ 6.61   $ 6.56   $ 5.39    $         $6.57   $6.53    $5.37
------------------------------------------------------------------------------------------------------
 TOTAL RETURN (b)                     %     5.1%    30.3%     8.0%         %     4.6%   29.8%     7.6%
------------------------------------------------------------------------------------------------------
 RATIOS AND SUPPLEMENTAL DATA:
   NET ASSETS, END OF PERIOD
   (000)                        $        $6,447   $5,678   $2,926    $         $ 729   $ 671    $ 390
   RATIO OF EXPENSES TO
   AVERAGE NET ASSETS (a)             %     2.0%     2.0%     2.0%*        %     2.5%    2.5%*    2.5%*
   RATIO OF NET INVESTMENT
   INCOME TO AVERAGE NET
   ASSETS (a)                         %     1.3%     1.4%     1.8%*        %     0.8%     .9%     1.6%*
------------------------------------------------------------------------------------------------------
</TABLE>



<TABLE>
<CAPTION>
                                                                 YEAR ENDED
                                                                 MARCH 31,                 SEPTEMBER 9, 1996
                                                       ------------------------------           THROUGH
                                                        2000        1999        1998        MARCH 31, 1997
------------------------------------------------------------------------------------------------------------
<S>                                                    <C>         <C>         <C>         <C>
 PORTFOLIO TURNOVER RATE                                    %      106.3%       64.8%          160.4%*
------------------------------------------------------------------------------------------------------------
</TABLE>



(a)  After reimbursement and waiver of expenses by CAM equivalent to     %,
     1.2%, 1.0%, and 1.8%* of average net assets, respectively, for Class A
     shares and     %, 1.5%, 1.2% and 1.8%*, respectively, for Class C shares.


(b)  Total return is not annualized and does not reflect the effect of sales
     charges.

*  Annualized

CALAMOS FAMILY OF FUNDS                                                       83
<PAGE>   94

<TABLE>
         <S>             <C>
         [TELEPHONE      For More Information
             KEYPAD
              ICON]
</TABLE>

            If you would like more information about the Funds, the
            following resources are available upon request, free of
            charge.


<TABLE>
                    <S>                                                             <C>
                    ANNUAL AND SEMIANNUAL                                           STATEMENT OF ADDITIONAL INFORMATION
                    REPORTS                                                         The Statement of Additional Information
                    Additional information about the Funds'                         (SAI) provides more detailed information
                    investments is available in the Funds' annual                   about the Funds and is incorporated into
                    and semiannual reports to shareholders. The                     this prospectus by reference.
                    reports contain a discussion of the market                      You can get free copies of reports and the
                    conditions and investment strategies that                       SAI, request other information and discuss
                    significantly affected the Funds' performance                   your questions about the Funds by contacting
                    for the past six-month and twelve-month                         CALAMOS ASSET MANAGEMENT, INC. at:
                    periods.
                    FOR SHAREHOLDER ASSISTANCE                                      CALAMOS(R) ASSET MANAGEMENT, INC.
                    24 HOURS                                                        1111 E. Warrenville Road
                    800.823.7386                                                    Naperville, Illinois 60563-1493
                    TO OPEN AN ACCOUNT OR OBTAIN INFORMATION
                    800.823.7386                                                    Telephone: 1-800-823-7386
                    VISIT OUR WEB-SITE
                    HTTP://WWW.CALAMOS.COM                                          You can review the Funds' reports and SAI at
                                                                                    the Public Reference Room of the Securities
                                                                                    and Exchange Commission. You can get
                                                                                    text-only copies for free from the EDGAR
                                                                                    Database on the Commission's Internet
                                                                                    website at: http://www.sec.gov, or for a fee
                                                                                    by electronic request at the following
                                                                                    E-mail address: [email protected], or by
                                                                                    calling or writing to:
                                                                                    Public Reference Section of the Commission
                                                                                    Washington, D.C. 20549-0102
                                                                                    Telephone: 1-202-942-8090
</TABLE>


                                          Investment Company Act file no.
                                          811-5443
<PAGE>   95


STATEMENT OF ADDITIONAL INFORMATION                              AUGUST 1, 2000




                           CALAMOS(R) FAMILY OF FUNDS



CONVERTIBLE FUND
CONVERTIBLE GROWTH AND INCOME FUND*

MARKET NEUTRAL FUND
GROWTH FUND
GLOBAL CONVERTIBLE FUND**
HIGH YIELD FUND
GLOBAL CONVERTIBLE TECHNOLOGY FUND

*FORMERLY NAMED GROWTH AND INCOME FUND
**FORMERLY NAMED GLOBAL GROWTH AND INCOME FUND



1111 East Warrenville Road
Naperville, Illinois  60563-1493
(630) 245-7200
Toll Free:  (800) 8-CFS-FUND (800/823-7386)


         This Statement of Additional Information relates to CALAMOS(R)
Convertible Fund, CALAMOS(R) Convertible Growth and Income Fund (formerly named
Growth and Income Fund), CALAMOS(R) Market Neutral Fund, CALAMOS(R) Growth Fund,
Calamos(R) Global Convertible Fund (formerly named Global Growth and Income
Fund), Calamos(R) High Yield Fund and Calamos(R) Global Convertible Technology
Fund (the "Funds"), each of which is a series of Calamos Investment Trust (the
"Trust"). It is not a prospectus, but provides information that should be read
in conjunction with the Funds' prospectus dated the same date as this Statement
of Additional Information and any supplements thereto. The prospectus may be
obtained without charge by writing or telephoning the Funds at the address or
telephone numbers set forth above.



                                TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                                               Page
                                                                                               ----
<S>                                                                                            <C>

                  The Trust and the Funds.......................................................A         3
                  Investment Practices..........................................................3
                  Investment Restrictions......................................................20
                  Management...................................................................22
                  Investment Advisory Services.................................................24
                  Distribution Plan............................................................25
                  Purchasing and Redeeming Shares..............................................27
                  Performance Information......................................................38
                  Distributor..................................................................44
                  Portfolio Transactions.......................................................45
                  Taxation.....................................................................48
                  Allocation Among Funds.......................................................49
                  Certain Shareholders.........................................................50
                  Custodian....................................................................53
                  Independent Auditors.........................................................53
                  General Information..........................................................53
                  Financial Statements.........................................................54
                  Appendix-Description of Bond Ratings.........................................48

</TABLE>




                                      B-1
<PAGE>   96



                             THE TRUST AND THE FUNDS


Each Fund is a series of Calamos Investment Trust (the "Trust") which was
organized as a Massachusetts business trust on December 21, 1987. Each Fund,
except Global Convertible Technology Fund, is an open-end, diversified
management investment company. Global Convertible Technology Fund is an
open-end, non-diversified management investment company. Prior to June 23, 1997
the name of the trust was CFS Investment Trust. Market Neutral Fund was named
"Strategic Income Fund" prior to July 30, 1999. Prior to July 30, 2000,
Convertible Growth and Income Fund was named "Growth and Income Fund" and Global
Convertible Fund was named "Global Growth and Income Fund."



                              INVESTMENT OBJECTIVES

         Each Fund's investment objective is shown below:

         CONVERTIBLE FUND seeks current income. Growth is a secondary objective
that the Fund also considers when consistent with its objective of current
income.


         CONVERTIBLE GROWTH AND INCOME FUND seeks high long-term total return
through capital appreciation and current income derived from a diversified
portfolio of convertible, equity and fixed-income securities.



         MARKET NEUTRAL FUND seeks high current income consistent with stability
of principal, primarily through investment in convertible securities and
employing short selling to enhance income and hedge against market risk.


         GROWTH FUND seeks long-term capital growth.


         GLOBAL CONVERTIBLE FUND seeks high long-term total return through
capital appreciation and current income derived from a globally diversified
portfolio of convertible, equity and fixed-income securities.


         HIGH YIELD FUND seeks the highest level of current income obtainable
consistent with reasonable risk. As a secondary objective the Fund seeks capital
gain where consistent with its primary objective.


         GLOBAL CONVERTIBLE TECHNOLOGY FUND seeks high long-term total return
through capital appreciation and current income.


         The investment objective of each Fund is "fundamental," which means
that a Fund's objective cannot be changed without the approval of the holders of
a "majority of the outstanding voting securities" of that Fund, as defined in
the Investment Company Act of 1940.

                                      B-2

<PAGE>   97

                              INVESTMENT PRACTICES


         The prospectus contains information concerning each Fund's investment
objective and principal investment strategies and risks. This SAI provides
additional information concerning certain securities and strategies used by the
Funds and their associated risks.

         In pursuing its investment objective, each Fund will invest as
described below and in the prospectus.


CONVERTIBLE SECURITIES


         Convertible securities include any corporate debt security or preferred
stock that may be converted into underlying shares of common stock. The common
stock underlying convertible securities may be issued by a different entity than
the issuer of the convertible securities. Convertible securities entitle the
holder to receive interest payments paid on corporate debt securities or the
dividend preference on a preferred stock until such time as the convertible
security matures or is redeemed or until the holder elects to exercise the
conversion privilege. As a result of the conversion feature, however, the
interest rate or dividend preference on a convertible security is generally less
than would be the case if the securities were issued in non-convertible form.


         The value of convertible securities is influenced by both the yield of
non-convertible securities of comparable issuers and by the value of the
underlying common stock. The value of a convertible security viewed without
regard to its conversion feature (i.e., strictly on the basis of its yield) is
sometimes referred to as its "investment value." The investment value of the
convertible security will typically fluctuate inversely with changes in
prevailing interest rates. However, at the same time, the convertible security
will be influenced by its "conversion value," which is the market value of the
underlying common stock that would be obtained if the convertible security were
converted. Conversion value fluctuates directly with the price of the underlying
common stock.


         If, because of a low price of the common stock, the conversion value is
substantially below the investment value of the convertible security, the price
of the convertible security is governed principally by its investment value. If
the conversion value of a convertible security increases to a point that
approximates or exceeds its investment value, the value of the security will be
principally influenced by its conversion value. A convertible security will sell
at a premium over its conversion value to the extent investors place value on
the right to acquire the underlying common stock while holding a fixed income
security. Holders of convertible securities have a claim on the assets of the
issuer prior to the common stockholders, but may be subordinated to holders of
similar non-convertible securities of the same issuer.

SYNTHETIC CONVERTIBLE SECURITIES

         The investment manager may create a "synthetic" convertible security by
combining fixed income securities with the right to acquire equity securities.
More flexibility is possible in the assembly of a synthetic convertible security
than in the purchase of a convertible security. Although synthetic convertible
securities may be selected where the two components are issued by a single
issuer, thus making the synthetic convertible security similar to the true
convertible security, the character of a synthetic convertible security allows
the combination of components representing distinct issuers, when management
believes that such a combination would better promote the Fund's investment
objective. A synthetic convertible security also is a more flexible investment
in that its two components may be purchased separately. For example, the Fund
may purchase a warrant for inclusion in a synthetic convertible security but
temporarily hold short-term investments while postponing the purchase of a

                                      B-3
<PAGE>   98


corresponding bond pending development of more favorable market conditions. For
the Convertible Fund, Convertible Growth and Income Fund, Global Convertible
Fund, and Global Convertible Technology Fund, each Fund's holdings of synthetic
convertible securities that are created by the investment manager are not
considered convertible securities for purposes of each Fund's policy to invest
at least 65% of its assets in convertible securities.


         A holder of a synthetic convertible security faces the risk of a
decline in the price of the security or the level of the index involved in the
convertible component, causing a decline in the value of the call option or
warrant purchased to create the synthetic convertible security. Should the price
of the stock fall below the exercise price and remain there throughout the
exercise period, the entire amount paid for the call option or warrant would be
lost. Since a synthetic convertible security includes the fixed-income component
as well, the holder of a synthetic convertible security also faces the risk that
interest rates will rise, causing a decline in the value of the fixed-income
instrument.

         The Funds may also purchase synthetic convertible securities
manufactured by other parties, including convertible structured notes.
Convertible structured notes are fixed income debentures linked to equity, and
are typically issued by investment banks. Convertible structured notes have the
attributes of a convertible security, however, the investment bank that issued
the convertible note assumes the credit risk associated with the investment,
rather than the issuer of the underlying common stock into which the note is
convertible.

DEBT SECURITIES

         In pursuing its investment objective, each Fund may invest in
convertible and non-convertible debt securities, including lower-rated
securities (i.e., securities rated BB or lower by Standard & Poor's Corporation
or Ba or lower by Moody's Investor Services, Inc.) and securities that are not
rated but are considered by the investment manager to be of similar quality.
There are no restrictions as to the ratings of debt securities acquired by a
Fund or the portion of a Fund's assets that may be invested in debt securities
in a particular ratings category, except that no Fund other than the High Yield
Fund will acquire a security rated below C.

         Securities rated BBB or Baa are considered to be medium grade and to
have speculative characteristics. Lower-rated debt securities are predominantly
speculative with respect to the issuer's capacity to pay interest and repay
principal. Investment in medium- or lower-quality debt securities involves
greater investment risk, including the possibility of issuer default or
bankruptcy. An economic downturn could severely disrupt the market for such
securities and adversely affect the value of such securities. In addition,
lower-quality bonds are less sensitive to interest rate changes than
higher-quality instruments and generally are more sensitive to adverse economic
changes or individual corporate developments. During a period of adverse
economic changes, including a period of rising interest rates, issuers of such
bonds may experience difficulty in servicing their principal and interest
payment obligations.

         Achievement by each Fund of its investment objectives will be more
dependent on the investment manager's credit analysis than would be the case if
the Fund were investing in higher-quality debt securities. Since the ratings of
rating services (which evaluate the safety of principal and interest payments,
not market risks) are used only as preliminary indicators of investment quality,
the investment manager employs its own credit research and analysis. These
analyses may take into consideration such quantitative factors as an issuer's
present and potential liquidity, profitability, internal capability to generate
funds, debt/equity ratio and debt servicing capabilities, and such qualitative
factors as an assessment of management, industry characteristics, accounting
methodology, and foreign business exposure.

                                      B-4
<PAGE>   99

         Medium- and lower-quality debt securities may be less marketable than
higher-quality debt securities because the market for them is less broad. The
market for unrated debt securities is even narrower. During periods of thin
trading in these markets, the spread between bid and asked prices is likely to
increase significantly, and the Fund may have greater difficulty selling its
portfolio securities. The market value of these securities and their liquidity
may be affected by adverse publicity and investor perceptions.

RULE 144A SECURITIES



         Each Fund may purchase securities that have been privately placed but
that are eligible for purchase and sale by certain qualified institutional
buyers, such as the Funds, under Rule 144A under the Securities Act of 1933. The
investment manager, under the supervision of the Trust's board of trustees, will
consider whether securities purchased under Rule 144A are illiquid and thus
subject to the Fund's restriction of investing no more than a specified
percentage of its net assets in illiquid securities. A determination of whether
a Rule 144A security is liquid or not is a question of fact. In making this
determination, the investment manager will consider the trading markets for the
specific security, taking into account the unregistered nature of a Rule 144A
security. In addition, the investment manager could consider the (1) frequency
of trades and quotes, (2) number of dealers and potential purchasers, (3) dealer
undertakings to make a market and (4) nature of a security and of marketplace
trades (e.g., the time needed to dispose of the security, the method of
soliciting offers and the mechanics of transfer). The liquidity of Rule 144A
securities will be monitored and, if as a result of changed conditions, it is
determined that a Rule 144A security is no longer liquid, the Fund's holdings of
illiquid securities would be reviewed to determine what, if any, steps are
required to assure that the Fund does not invest more than 10% of its assets in
illiquid securities. Investing in Rule 144A securities could have the effect of
increasing the amount of the Fund's assets invested in illiquid securities if
qualified institutional buyers are unwilling to purchase such securities.



FOREIGN SECURITIES


         Each of Global Convertible Fund and Global Convertible Technology Fund
may invest all of its assets, and each other Fund may invest up to 25% of its
net assets, in securities of foreign issuers. For this purpose, foreign
securities do not include American Depositary Receipts (ADRs) or securities
guaranteed by a United States person, but may include foreign securities in the
form of European Depositary Receipts (EDRs), Global Depositary Receipts (GDRs)
or other securities representing underlying shares of foreign issuers. Positions
in those securities are not necessarily denominated in the same currency as the
common stocks into which they may be converted. ADRs are receipts typically
issued by an American bank or trust company evidencing ownership of the
underlying securities. EDRs are European receipts listed on the Luxembourg Stock
Exchange evidencing a similar arrangement. GDRs are U.S. dollar-denominated
receipts evidencing ownership of foreign securities. Generally, ADRs, in
registered form, are designed for the U.S. securities markets and EDRs and GDRs,
in bearer form, are designed for use in foreign securities markets. Each Fund
may invest in sponsored or unsponsored ADRs. In the case of an unsponsored ADR,
the Fund is likely to bear its proportionate share of the expenses of the
depository and it may have greater difficulty in receiving shareholder
communications than it would have with a sponsored ADR.


         To the extent positions in portfolio securities are denominated in
foreign currencies, a Fund's investment performance is affected by the strength
or weakness of the U.S. dollar against those currencies. For example, if the
dollar falls in value relative to the Japanese yen, the dollar value of a
Japanese stock held in the portfolio will rise even though the price of the
stock remains unchanged. Conversely, if the dollar rises in value relative to
the yen, the dollar value of the Japanese stock will fall. (See discussion of
transaction hedging and portfolio hedging below under "Currency Exchange
Transactions.")

                                      B-5
<PAGE>   100


         Investors should understand and consider carefully the risks involved
in foreign investing. Investing in foreign securities, which are generally
denominated in foreign currencies, and utilization of forward foreign currency
exchange contracts involve certain considerations comprising both risks and
opportunities not typically associated with investing in U.S. securities. These
considerations include: fluctuations in exchange rates of foreign currencies;
possible imposition of exchange control regulation or currency restrictions that
would prevent cash from being brought back to the United States; less public
information with respect to issuers of securities; less governmental supervision
of stock exchanges, securities brokers, and issuers of securities; lack of
uniform accounting, auditing and financial reporting standards; lack of uniform
settlement periods and trading practices; less liquidity and frequently greater
price volatility in foreign markets than in the United States; possible
imposition of foreign taxes; and sometimes less advantageous legal, operational
and financial protections applicable to foreign sub-custodial arrangements.

         Although the Funds intend to invest in companies and governments of
countries having stable political environments, there is the possibility of
expropriation or confiscatory taxation, seizure or nationalization of foreign
bank deposits or other assets, establishment of exchange controls, the adoption
of foreign government restrictions, or other adverse political, social or
diplomatic developments that could affect investment in these nations.


         Each Fund other than Global Convertible Fund and Global Convertible
Technology Fund expects that substantially all of its investments will be in
developed nations. However, each Fund may invest in the securities of emerging
countries. The securities markets of emerging countries are substantially
smaller, less developed, less liquid and more volatile than the securities
markets of the U.S. and other more developed countries. Disclosure and
regulatory standards in many respects are less stringent than in the U.S. and
other major markets. There also may be a lower level of monitoring and
regulation of emerging markets and the activities of investors in such markets,
and enforcement of existing regulations has been extremely limited. Economies in
individual emerging markets may differ favorably or unfavorably from the U.S.
economy in such respects as growth of gross domestic product, rates of
inflation, currency depreciation, capital reinvestment, resource
self-sufficiency and balance of payments positions. Many emerging market
countries have experienced high rates of inflation for many years, which has had
and may continue to have very negative effects on the economies and securities
markets of those countries.


CURRENCY EXCHANGE TRANSACTIONS

         Currency exchange transactions may be conducted either on a spot (i.e.,
cash) basis at the spot rate for purchasing or selling currency prevailing in
the foreign exchange market or through forward currency exchange contracts
("forward contracts"). Forward contracts are contractual agreements to purchase
or sell a specified currency at a specified future date (or within a specified
time period) and price set at the time of the contract. Forward contracts are
usually entered into with banks, foreign exchange dealers and broker-dealers,
are not exchange traded, and are usually for less than one year, but may be
renewed.

         Forward currency exchange transactions may involve currencies of the
different countries in which the Funds may invest and serve as hedges against
possible variations in the exchange rate between these currencies. Currency
exchange transactions are limited to transaction hedging and portfolio hedging
involving either specific transactions or portfolio positions, except to the
extent described below under "Synthetic Foreign Money Market Positions."
Transaction hedging is the purchase or sale of forward contracts with respect to
specific receivables or payables of a Fund accruing in connection with the
purchase and sale of its portfolio securities or the receipt of dividends or
interest thereon. Portfolio hedging is the use of forward contracts with respect
to portfolio security positions denominated or quoted in a particular foreign
currency. Portfolio hedging allows the Fund to limit or reduce its exposure in a
foreign currency by entering into a forward contract to sell such foreign
currency (or

                                      B-6
<PAGE>   101


another foreign currency that acts as a proxy for that currency) at a future
date for a price payable in U.S. dollars so that the value of the foreign
denominated portfolio securities can be approximately matched by a foreign
denominated liability. The Fund may not engage in portfolio hedging with respect
to the currency of a particular country to an extent greater than the aggregate
market value (at the time of making such sale) of the securities held in its
portfolio denominated or quoted in that particular currency, except that the
Fund may hedge all or part of its foreign currency exposure through the use of a
basket of currencies or a proxy currency where such currencies or currency act
as an effective proxy for other currencies. In such a case, the Fund may enter
into a forward contract where the amount of the foreign currency to be sold
exceeds the value of the securities denominated in such currency. The use of
this basket hedging technique may be more efficient and economical than entering
into separate forward contracts for each currency held in the Fund. The Fund may
not engage in "speculative" currency exchange transactions.

         If a Fund enters into a forward contract, the Fund's custodian will
segregate liquid assets of the Fund having a value equal to the Fund's
commitment under such forward contract. At the maturity of the forward contract
to deliver a particular currency, the Fund may either sell the portfolio
security related to the contract and make delivery of the currency, or it may
retain the security and either acquire the currency on the spot market or
terminate its contractual obligation to deliver the currency by purchasing an
offsetting contract with the same currency trader obligating it to purchase on
the same maturity date the same amount of the currency.

         It is impossible to forecast with absolute precision the market value
of portfolio securities at the expiration of a forward contract. Accordingly, it
may be necessary for a Fund to purchase additional currency on the spot market
(and bear the expense of such purchase) if the market value of the security is
less than the amount of currency the Fund is obligated to deliver and if a
decision is made to sell the security and make delivery of the currency.
Conversely, it may be necessary to sell on the spot market some of the currency
received upon the sale of the portfolio security if its market value exceeds the
amount of currency the Fund is obligated to deliver.

         If a Fund retains the portfolio security and engages in an offsetting
transaction, the Fund will incur a gain or a loss to the extent that there has
been movement in forward contract prices. If the Fund engages in an offsetting
transaction, it may subsequently enter into a new forward contract to sell the
currency. Should forward prices decline during the period between the Fund's
entering into a forward contract for the sale of a currency and the date it
enters into an offsetting contract for the purchase of the currency, the Fund
will realize a gain to the extent the price of the currency it has agreed to
sell exceeds the price of the currency it has agreed to purchase. Should forward
prices increase, the Fund will suffer a loss to the extent the price of the
currency it has agreed to purchase exceeds the price of the currency it has
agreed to sell. A default on the contract would deprive the Fund of unrealized
profits or force the Fund to cover its commitments for purchase or sale of
currency, if any, at the current market price.

         Hedging against a decline in the value of a currency does not eliminate
fluctuations in the value of a portfolio security traded in that currency or
prevent a loss if the value of the security declines. Hedging transactions also
preclude the opportunity for gain if the value of the hedged currency should
rise. Moreover, it may not be possible for a Fund to hedge against a devaluation
that is so generally anticipated that the Fund is not able to contract to sell
the currency at a price above the devaluation level it anticipates. The cost to
a Fund of engaging in currency exchange transactions varies with such factors as
the currency involved, the length of the contract period, and prevailing market
conditions. Since currency exchange transactions are usually conducted on a
principal basis, no fees or commissions are involved.

SYNTHETIC FOREIGN MONEY MARKET POSITIONS

                                      B-7
<PAGE>   102


         Each Fund may invest in money market instruments denominated in foreign
currencies. In addition to, or in lieu of, such direct investment, a Fund may
construct a synthetic foreign money market position by (a) purchasing a money
market instrument denominated in one currency, generally U.S. dollars, and (b)
concurrently entering into a forward contract to deliver a corresponding amount
of that currency in exchange for a different currency on a future date and at a
specified rate of exchange. For example, a synthetic money market position in
Japanese yen could be constructed by purchasing a U.S. dollar money market
instrument, and entering concurrently into a forward contract to deliver a
corresponding amount of U.S. dollars in exchange for Japanese yen on a specified
date and at a specified rate of exchange. Because of the availability of a
variety of highly liquid short-term U.S. dollar money market instruments, a
synthetic money market position utilizing such U.S. dollar instruments may offer
greater liquidity than direct investment in foreign currency and a concurrent
construction of a synthetic position in such foreign currency, in terms of both
income yield and gain or loss from changes in currency exchange rates, in
general should be similar, but would not be identical because the components of
the alternative investments would not be identical.

LENDING OF PORTFOLIO SECURITIES

         Each Fund may lend its portfolio securities to broker-dealers and
banks. Any such loan must be continuously secured by collateral in cash or cash
equivalents maintained on a current basis in an amount at least equal to the
market value of the securities loaned by the Fund. The Fund would continue to
receive the equivalent of the interest or dividends paid by the issuer on the
securities loaned, and would also receive an additional return that may be in
the form of a fixed fee or a percentage of the collateral. The Fund may pay
reasonable fees to persons unaffiliated with the Fund for services in arranging
these loans. The Fund would have the right to call the loan and obtain the
securities loaned at any time on notice of not more than five business days. The
Fund would not have the right to vote the securities during the existence of the
loan but would call the loan to permit voting of the securities, if, in the
investment manager's judgment, a material event requiring a shareholder vote
would otherwise occur before the loan was repaid. In the event of bankruptcy or
other default of the borrower, the Fund could experience both delays in
liquidating the loan collateral or recovering the loaned securities and losses,
including (a) possible decline in the value of the collateral or in the value of
the securities loaned during the period while the Fund seeks to enforce its
rights thereto, (b) possible subnormal levels of income and lack of access to
income during this period, and (c) expenses of enforcing its rights. In an
effort to reduce these risks, the investment manager will monitor the
creditworthiness of the firms to which the Fund lends securities.

REPURCHASE AGREEMENTS


         Each Fund may invest in repurchase agreements, provided that neither
Global Convertible Fund nor Global Convertible Technology Fund may invest more
than 15%, and no other Fund may invest more than 10%, of its net assets in
repurchase agreements maturing in more than seven days and any other illiquid
securities. A repurchase agreement is a sale of securities to the Fund in which
the seller agrees to repurchase the securities at a higher price, which includes
an amount representing interest on the purchase price, within a specified time.
In the event of bankruptcy of the seller, the Fund could experience both losses
and delays in liquidating its collateral.


OPTIONS ON SECURITIES, INDEXES AND CURRENCIES

         Each Fund may purchase and sell put options and call options on
securities, indexes or foreign currencies in standardized contracts traded on
recognized securities exchanges, boards of trade, or similar entities, or quoted
on NASDAQ. A Fund may purchase agreements, sometimes called cash puts, that may
accompany the purchase of a new issue of bonds from a dealer.

                                       B-8
<PAGE>   103


         An option on a security (or index) is a contract that gives the
purchaser (holder) of the option, in return for a premium, the right to buy from
(call) or sell to (put) the seller (writer) of the option the security
underlying the option (or the cash value of the index) at a specified exercise
price at any time during the term of the option (normally not exceeding nine
months). The writer of an option on an individual security or on a foreign
currency has the obligation upon exercise of the option to deliver the
underlying security or foreign currency upon payment of the exercise price or to
pay the exercise price upon delivery of the underlying security or foreign
currency. Upon exercise, the writer of an option on an index is obligated to pay
the difference between the cash value of the index and the exercise price
multiplied by the specified multiplier for the index option. (An index is
designed to reflect specified facets of a particular financial or securities
market, a specific group of financial instruments or securities, or certain
economic indicators.)

         A Fund will write call options and put options only if they are
"covered." For example, in the case of a call option on a security, the option
is "covered" if the Fund owns the security underlying the call or has an
absolute and immediate right to acquire that security without additional cash
consideration (or, if additional cash consideration is required, cash or cash
equivalents in such amount are held in a segregated account by its custodian)
upon conversion or exchange of other securities held in its portfolio.

         If an option written by a Fund expires, the Fund realizes a capital
gain equal to the premium received at the time the option was written. If an
option purchased by the Fund expires, the Fund realizes a capital loss equal to
the premium paid.

         Prior to the earlier of exercise or expiration, an option may be closed
out by an offsetting purchase or sale of an option of the same series (type,
exchange, underlying security or index, exercise price and expiration). There
can be no assurance, however, that a closing purchase or sale transaction can be
effected when the Fund desires.

         A Fund will realize a capital gain from a closing purchase transaction
if the cost of the closing option is less than the premium received from writing
the option, or, if it is more, the Fund will realize a capital loss. If the
premium received from a closing sale transaction is more than the premium paid
to purchase the option, the Fund will realize a capital gain or, if it is less,
the Fund will realize a capital loss. The principal factors affecting the market
value of a put or a call option include supply and demand, interest rates, the
current market price of the underlying security or index in relation to the
exercise price of the option, the volatility of the underlying security or
index, and the time remaining until the expiration date.

         A put or call option purchased by a Fund is an asset of the Fund,
valued initially at the premium paid for the option. The premium received for an
option written by the Fund is recorded as a deferred credit. The value of an
option purchased or written is marked-to-market daily and is valued at the
closing price on the exchange on which it is traded or, if not traded on an
exchange or no closing price is available, at the mean between the last bid and
asked prices.

         RISKS ASSOCIATED WITH OPTIONS. There are several risks associated with
transactions in options. For example, there are significant differences between
the securities markets, the currency markets and the options markets that could
result in an imperfect correlation among these markets, causing a given
transaction not to achieve its objectives. A decision as to whether, when and
how to use options involves the exercise of skill and judgment, and even a
well-conceived transaction may be unsuccessful to some degree because of market
behavior or unexpected events.

         There can be no assurance that a liquid market will exist when a Fund
seeks to close out an option position. If the Fund were unable to close out an
option that it has purchased on a security, it would have to exercise the

                                       B-9
<PAGE>   104

option in order to realize any profit or the option would expire and become
worthless. If the Fund were unable to close out a covered call option that it
had written on a security, it would not be able to sell the underlying security
until the option expired. As the writer of a covered call option on a security,
the Fund foregoes, during the option's life, the opportunity to profit from
increases in the market value of the security covering the call option above the
sum of the premium and the exercise price of the call. As the writer of a
covered call option on a foreign currency, the Fund foregoes, during the
option's life, the opportunity to profit from currency appreciation.

         If trading were suspended in an option purchased or written by a Fund,
the Fund would not be able to close out the option. If restrictions on exercise
were imposed, the Fund might not be able to exercise an option it has purchased.

FUTURES CONTRACTS AND OPTIONS ON FUTURES CONTRACTS

         Each Fund may use interest rate futures contracts, index futures
contracts and foreign currency futures contracts. An interest rate, index or
foreign currency futures contract provides for the future sale by one party and
purchase by another party of a specified quantity of a financial instrument or
the cash value of an index(1) at a specified price and time. A public market
exists in futures contracts covering a number of indexes (including, but not
limited to: the Standard & Poor's 500 Index, the Russell 2000 Index, the Value
Line Composite Index, and the New York Stock Exchange Composite Index) as well
as financial instruments (including, but not limited to: U.S. Treasury bonds,
U.S. Treasury notes, Eurodollar certificates of deposit and foreign currencies).
Other index and financial instrument futures contracts are available and it is
expected that additional futures contracts will be developed and traded.

         Each Fund may purchase and write call and put futures options. Futures
options possess many of the same characteristics as options on securities,
indexes and foreign currencies (discussed above). A futures option gives the
holder the right, in return for the premium paid, to assume a long position
(call) or short position (put) in a futures contract at a specified exercise
price at any time during the period of the option. Upon exercise of a call
option, the holder acquires a long position in the futures contract and the
writer is assigned the opposite short position. In the case of a put option, the
opposite is true. The Fund might, for example, use futures contracts to hedge
against or gain exposure to fluctuations in the general level of stock prices,
anticipated changes in interest rates or currency fluctuations that might
adversely affect either the value of the Fund's securities or the price of the
securities that the Fund intends to purchase. Although other techniques could be
used to reduce or increase the Fund's exposure to stock price, interest rate and
currency fluctuations, the Fund may be able to achieve its desired exposure more
effectively and perhaps at a lower cost by using futures contracts and futures
options.

         A Fund will only enter into futures contracts and futures options that
are standardized and traded on an exchange, board of trade or similar entity, or
quoted on an automated quotation system.

         The success of any futures transaction depends on the investment
manager correctly predicting changes in the level and direction of stock prices,
interest rates, currency exchange rates and other factors. Should those
predictions be incorrect, the Fund's return might have been better had the
transaction not been attempted; however, in the absence of the ability to use
futures contracts, the investment manager might have taken portfolio actions in


--------------------------
1     A futures contract on an index is an agreement pursuant to which two
      parties agree to take or make delivery of an amount of cash equal to the
      difference between the value of the index at the close of the last trading
      day of the contract and the price at which the index contract was
      originally written. Although the value of a securities index is a function
      of the value of certain specified securities, no physical delivery of
      those securities is made.

                                      B-10
<PAGE>   105


anticipation of the same market movements with similar investment results, but,
presumably, at greater transaction costs.

         When a purchase or sale of a futures contract is made by a Fund, the
Fund is required to deposit with its custodian (or broker, if legally permitted)
a specified amount of cash or U.S. Government securities or other securities
acceptable to the broker ("initial margin"). The margin required for a futures
contract is set by the exchange on which the contract is traded and may be
modified during the term of the contract, although a Fund's broker may require
margin deposits in excess of the minimum required by the exchange. The initial
margin is in the nature of a performance bond or good faith deposit on the
futures contract, which is returned to the Fund upon termination of the
contract, assuming all contractual obligations have been satisfied. The Fund
expects to earn interest income on its initial margin deposits. A futures
contract held by the Fund is valued daily at the official settlement price of
the exchange on which it is traded. Each day the Fund pays or receives cash,
called "variation margin," equal to the daily change in value of the futures
contract. This process is known as "marking-to-market." Variation margin paid or
received by the Fund does not represent a borrowing or loan by the Fund but is
instead settlement between the Fund and the broker of the amount one would owe
the other if the futures contract had expired at the close of the previous day.
In computing daily net asset value, the Fund will mark-to-market its open
futures positions.

         The Fund is also required to deposit and maintain margin with respect
to put and call options on futures contracts written by it. Such margin deposits
will vary depending on the nature of the underlying futures contract (and the
related initial margin requirements), the current market value of the option and
other futures positions held by the Fund.

         Although some futures contracts call for making or taking delivery of
the underlying securities, usually these obligations are closed out prior to
delivery by offsetting purchases or sales of matching futures contracts (same
exchange, underlying security or index, and delivery month). If an offsetting
purchase price is less than the original sale price, the Fund engaging in the
transaction realizes a capital gain, or if it is more, the Fund realizes a
capital loss. Conversely, if an offsetting sale price is more than the original
purchase price, the Fund engaging in the transaction realizes a capital gain, or
if it less, the Fund realizes a capital loss. The transaction costs must also be
included in these calculations.

         RISKS ASSOCIATED WITH FUTURES. There are several risks associated with
the use of futures contracts and futures options. A purchase or sale of a
futures contract may result in losses in excess of the amount invested in the
futures contract. In trying to increase or reduce market exposure, there can be
no guarantee that there will be a correlation between price movements in the
futures contract and in the portfolio exposure sought. In addition, there are
significant differences between the securities and futures markets that could
result in an imperfect correlation between the markets, causing a given
transaction not to achieve its objectives. The degree of imperfection of
correlation depends on circumstances such as: variations in speculative market
demand for futures, futures options and the related securities, including
technical influences in futures and futures options trading and differences
between the securities markets and the securities underlying the standard
contracts available for trading. For example, in the case of index futures
contracts, the composition of the index, including the issuers and the weighing
of each issue, may differ from the composition of the Fund's portfolio, and, in
the case of interest rate futures contracts, the interest rate levels,
maturities and creditworthiness of the issues underlying the futures contract
may differ from the financial instruments held in the Fund's portfolio. A
decision as to whether, when and how to use futures contracts involves the
exercise of skill and judgment, and even a well-conceived transaction may be
unsuccessful to some degree because of market behavior or unexpected stock price
or interest rate trends.


                                      B-11
<PAGE>   106

         Futures exchanges may limit the amount of fluctuation permitted in
certain futures contract prices during a single trading day. The daily limit
establishes the maximum amount that the price of a futures contract may vary
either up or down from the previous day's settlement price at the end of the
current trading session. Once the daily limit has been reached in a futures
contract subject to the limit, no more trades may be made on that day at a price
beyond that limit. The daily limit governs only price movements during a
particular trading day and therefore does not limit potential losses because the
limit may work to prevent the liquidation of unfavorable positions. For example,
futures prices have occasionally moved to the daily limit for several
consecutive trading days with little or no trading, thereby preventing prompt
liquidation of positions and subjecting some holders of futures contracts to
substantial losses. Stock index futures contracts are not normally subject to
such daily price change limitations.

         There can be no assurance that a liquid market will exist at a time
when a Fund seeks to close out a futures or futures option position. The Fund
would be exposed to possible loss on the position during the interval of
inability to close, and would continue to be required to meet margin
requirements until the position is closed. In addition, many of the contracts
discussed above are relatively new instruments without a significant trading
history. As a result, there can be no assurance that an active secondary market
will develop or continue to exist.

LIMITATIONS ON OPTIONS AND FUTURES

         If other options, futures contracts or futures options of types other
than those described herein are traded in the future, a Fund may also use those
investment vehicles, provided the board of trustees determines that their use is
consistent with the Fund's investment objective.

         A Fund will not enter into a futures contract or purchase an option
thereon if, immediately thereafter, the initial margin deposits for futures
contracts held by the Fund plus premiums paid by it for open futures option
positions, less the amount by which any such positions are "in-the-money," (2)
would exceed 5% of the Fund's total assets.

         When purchasing a futures contract or writing a put option on a futures
contract, a Fund must maintain with its custodian (or broker, if legally
permitted) cash or cash equivalents (including any margin) equal to the market
value of such contract. When writing a call option on a futures contract, the
Fund similarly will maintain with its custodian cash or cash equivalents
(including any margin) equal to the amount by which such option is in-the-money
until the option expires or is closed by the Fund.

         A Fund may not maintain open short positions in futures contracts, call
options written on futures contracts or call options written on indexes if, in
the aggregate, the market value of all such open positions exceeds the current
value of the securities in its portfolio, plus or minus unrealized gains and
losses on the open positions, adjusted for the historical relative volatility of
the relationship between the portfolio and the positions. For this purpose, to
the extent the Fund has written call options on specific securities in its
portfolio, the value of those securities will be deducted from the current
market value of the securities portfolio.

         In order to comply with Commodity Futures Trading Commission Regulation
4.5 and thereby avoid being deemed a "commodity pool operator," a Fund will use
commodity futures or commodity options contracts solely for bona fide hedging
purposes within the meaning and intent of Regulation 1.3(z), or, with respect to
positions in commodity futures and commodity options contracts that do not come
within the meaning and intent of 1.3(z), the

--------------------------
2     A call option is "in-the-money" if the value of the futures contract that
      is the subject of the option exceeds the exercise price. A put option is
      "in-the-money" if the exercise price exceeds the value of the futures
      contract that is the subject of the option.


                                      B-12
<PAGE>   107


aggregate initial margin and premiums required to establish such positions will
not exceed 5% of the fair market value of the assets of the Fund, after taking
into account unrealized profits and unrealized losses on any such contracts it
has entered into [in the case of an option that is in-the-money at the time of
purchase, the in-the-money amount (as defined in Section 190.01(x) of the
Commission Regulations) may be excluded in computing such 5%].

TAXATION OF OPTIONS AND FUTURES

         If a Fund exercises a call or put option that it holds, the premium
paid for the option is added to the cost basis of the security purchased (call)
or deducted from the proceeds of the security sold (put). For cash settlement
options and futures options exercised by the Fund, the difference between the
cash received at exercise and the premium paid is a capital gain or loss.

         If a call or put option written by a Fund is exercised, the premium is
included in the proceeds of the sale of the underlying security (call) or
reduces the cost basis of the security purchased (put). For cash settlement
options and futures options written by the Fund, the difference between the cash
paid at exercise and the premium received is a capital gain or loss.

         Entry into a closing purchase transaction will result in capital gain
or loss. If an option written by a Fund was in-the-money at the time it was
written and the security covering the option was held for more than the
long-term holding period prior to the writing of the option, any loss realized
as a result of a closing purchase transaction will be long-term. The holding
period of the securities covering an in-the-money option will not include the
period of time the option is outstanding.

         If a Fund writes an equity call option(3) other than a "qualified
covered call option," as defined in the Internal Revenue Code, any loss on such
option transaction, to the extent it does not exceed the unrealized gains on the
securities covering the option, may be subject to deferral until the securities
covering the option have been sold.

         A futures contract held until delivery results in capital gain or loss
equal to the difference between the price at which the futures contract was
entered into and the settlement price on the earlier of delivery notice date or
expiration date. If the Fund delivers securities under a futures contract, the
Fund also realizes a capital gain or loss on those securities.

         For federal income tax purposes, a Fund generally is required to
recognize as income for each taxable year its net unrealized gains and losses as
of the end of the year on futures, futures options and non-equity options
positions ("year-end mark-to-market"). Generally, any gain or loss recognized
with respect to such positions (either by year-end mark-to-market or by actual
closing of the positions) is considered to be 60% long-term and 40% short-term,
without regard to the holding periods of the contracts. However, in the case of
positions classified as part of a "mixed straddle," the recognition of losses on
certain positions (including options, futures and futures options positions, the
related securities and certain successor positions thereto) may be deferred to a
later taxable year. Sale of futures contracts or writing of call options (or
futures call options) or buying put options (or futures put options) that are
intended to hedge against a change in the value of securities held by the Fund:
(1) will affect the holding period of the hedged securities; and (2) may cause
unrealized gain or loss on such securities to be recognized upon entry into the
hedge.

--------------------------
3     An equity option is defined to mean any option to buy or sell stock, and
      any other option the value of which is determined by reference to an index
      of stocks of the type that is ineligible to be traded on a commodity
      futures exchange (e.g., an option contract on a sub-index based on the
      price of nine hotel-casino stocks). The definition of equity option
      excludes options on broad-based stock indexes (such as the Standard &
      Poor's 500 index).

                                      B-13
<PAGE>   108

         If a Fund were to enter into a short index future, short index futures
option or short index option position and the Fund's portfolio were deemed to
"mimic" the performance of the index underlying such contract, the option or
futures contract position and the Fund's stock positions would be deemed to be
positions in a mixed straddle, subject to the above-mentioned loss deferral
rules.

         In order for a Fund to continue to qualify for federal income tax
treatment as a regulated investment company, at least 90% of its gross income
for a taxable year must be derived from qualifying income; i.e., dividends,
interest, income derived from loans of securities and gains from the sale of
securities or foreign currencies, or other income (including but not limited to
gains from options, futures or forward contracts). Any net gain realized from
futures (or futures options) contracts will be considered gain from the sale of
securities and therefore be qualifying income for purposes of the 90%
requirement.

         Each Fund distributes to shareholders annually any net capital gains
that have been recognized for federal income tax purposes (including year-end
mark-to-market gains) on options and futures transactions. Such distributions
are combined with distributions of capital gains realized on the Fund's other
investments, and shareholders are advised of the nature of the payments.

WARRANTS


         Each Fund may invest in warrants. A warrant is a right to purchase
common stock at a specific price (usually at a premium above the market value of
the underlying common stock at time of issuance) during a specified period of
time. A warrant may have a life ranging from less than a year to twenty years or
longer, but a warrant becomes worthless unless it is exercised or sold before
expiration. In addition, if the market price of the common stock does not exceed
the warrant's exercise price during the life of the warrant, the warrant will
expire worthless. Warrants have no voting rights, pay no dividends and have no
rights with respect to the assets of the corporation issuing them. The
percentage increase or decrease in the value of a warrant may be greater than
the percentage increase or decrease in the value of the underlying common stock.


PORTFOLIO TURNOVER
         Although the Funds do not purchase securities with a view to rapid
turnover, there are no limitations on the length of time that portfolio
securities must be held. Portfolio turnover can occur for a number of reasons,
including calls for redemption, general conditions in the securities markets,
more favorable investment opportunities in other securities, or other factors
relating to the desirability of holding or changing a portfolio investment. The
portfolio turnover rates may vary greatly from year to year. A high rate of
portfolio turnover in a Fund would result in increased transaction expense,
which must be borne by that Fund. High portfolio turnover may also result in the
realization of capital gains or losses and, to the extent net short-term capital
gains are realized, any distributions resulting from such gains will be
considered ordinary income for federal income tax purposes.

SHORT SALES


         Each Fund may attempt to hedge against market risk and to enhance
income by selling short "against the box," that is: (1) entering into short
sales of securities that it currently has the right to acquire through the
conversion or exchange of other securities that it owns, or to a lesser extent,
entering into short sales of securities that it currently owns; and (2) entering
into arrangements with the broker-dealers through which such securities are sold
short to receive income with respect to the proceeds of short sales during the
period the Fund's short positions remain open. Each Fund other than Market
Neutral Fund may make short sales of securities only if at all times when a
short position is open the Fund owns an equal amount of such securities or
securities convertible into


                                      B-14
<PAGE>   109


or exchangeable for, without payment of any further consideration, securities of
the same issue as, and equal in amount to, the securities sold short.


         In addition to selling short against the box, Market Neutral Fund may
sell short securities that it currently has the right to acquire upon payment of
additional consideration, for instance, upon exercise of a warrant or option.
This technique would be used by Market Neutral Fund to hedge against market risk
in connection with a synthetic convertible security in the same way selling
short against the box hedges against market risk in connection with a true
convertible security.


         In a short sale against the box, a Fund does not deliver from its
portfolio the securities sold and does not receive immediately the proceeds from
the short sale. Instead, the Fund borrows the securities sold short from a
broker-dealer through which the short sale is executed, and the broker-dealer
delivers such securities, on behalf of the Fund, to the purchaser of such
securities. Such broker-dealer is entitled to retain the proceeds from the short
sale until the Fund delivers to such broker-dealer the securities sold short. In
addition, the Fund is required to pay to the broker-dealer the amount of any
dividends paid on shares sold short. Finally, to secure its obligation to
deliver to such broker-dealer the securities sold short, the Fund must deposit
and continuously maintain in a separate account with the Fund's custodian an
equivalent amount of the securities sold short or securities convertible into or
exchangeable for such securities without the payment of additional
consideration. The Fund is said to have a short position in the securities sold
until it delivers to the broker-dealer the securities sold, at which time the
Fund receives the proceeds of the sale. Because the Fund ordinarily will want to
continue to hold securities in its portfolio that are sold short, the Fund will
normally close out a short position by purchasing on the open market and
delivering to the broker-dealer an equal amount of the securities sold short,
rather than by delivering portfolio securities.

         A short sale works the same way, except that the Fund places in the
segregated account cash or U.S. government securities equal in value to the
difference between (i) the market value of the securities sold short at the time
they were sold short and (ii) any cash or U.S. government securities required to
be deposited with the broker as collateral. In addition, so long as the short
position is open, the Fund must daily adjust the value of the segregated account
so that the amount deposited in it, plus any amount deposited with the broker as
collateral, will equal the current market value of the security sold short.
However, the value of the segregated account may not be reduced below the point
at which the segregated account, plus any amount deposited with the broker, is
equal to the market value of the securities sold short at the time they were
sold short.


         Market Neutral Fund will conduct its short sales so that no more than
10% of the net assets of the Fund, when added together, will be (i) deposited
with brokers as collateral, and (ii) allocated to segregated accounts in
connection with short sales, at any time.


         Short sales may protect a Fund against the risk of losses in the value
of its portfolio securities because any unrealized losses with respect to such
portfolio securities should be wholly or partially offset by a corresponding
gain in the short position. However, any potential gains in such portfolio
securities should be wholly or partially offset by a corresponding loss in the
short position. The extent to which such gains or losses are offset will depend
upon the amount of securities sold short relative to the amount the Fund owns,
either directly or indirectly, and, in the case where the Fund owns convertible
securities, changes in the conversion premium.

         Short sale transactions of a Fund involve certain risks. In particular,
the imperfect correlation between the price movements of the convertible
securities and the price movements of the underlying common stock being sold
short creates the possibility that losses on the short sale hedge position may
be greater than gains in the value of the portfolio securities being hedged. In
addition, to the extent that a Fund pays a conversion premium for a


                                  B-15
<PAGE>   110


convertible security, the Fund is generally unable to protect against a loss of
such premium pursuant to a short sale hedge. In determining the number of shares
to be sold short against a Fund's position in the convertible securities, the
anticipated fluctuation in the conversion premiums is considered. A Fund will
also incur transaction costs in connection with short sales. Certain provisions
of the Internal Revenue Code may limit the degree to which the Fund is able to
enter into short sales, which limitations might impair the Fund's ability to
achieve its investment objective. See "Taxation."

         In addition to enabling a Fund to hedge against market risk, short
sales may afford a Fund an opportunity to earn additional current income to the
extent the Fund is able to enter into arrangements with broker-dealers through
which the short sales are executed to receive income with respect to the
proceeds of the short sales during the period the Fund's short positions remain
open.

          The Taxpayer Relief Act of 1997 imposed constructive sale treatment
for federal income tax purposes on certain hedging strategies with respect to
appreciated securities. Under these rules taxpayers will recognize gain, but not
loss, with respect to securities if they enter into short sales or "offsetting
notional principal contracts" (as defined by the Act), or futures or "forward
contracts" (as defined by the Act) with respect to the same or substantially
identical property, or if they enter into such transactions and then acquire the
same or substantially identical property. The Secretary of the Treasury is
authorized to promulgate regulations that will treat as constructive sales
certain transactions that have substantially the same effect as short sales.
"WHEN-ISSUED" AND DELAYED DELIVERY SECURITIES AND REVERSE REPURCHASE AGREEMENTS

         Each Fund may purchase securities on a when-issued or delayed-delivery
basis. Although the payment and interest terms of these securities are
established at the time the Fund enters into the commitment, the securities may
be delivered and paid for a month or more after the date of purchase, when their
value may have changed. The Fund makes such commitments only with the intention
of actually acquiring the securities, but may sell the securities before
settlement date if the Adviser deems it advisable for investment reasons. The
Fund may utilize spot and forward foreign currency exchange transactions to
reduce the risk inherent in fluctuations in the exchange rate between one
currency and another when securities are purchased or sold on a when-issued or
delayed-delivery basis.

         Each Fund may enter into reverse repurchase agreements with banks and
securities dealers. A reverse repurchase agreement is a repurchase agreement in
which the Fund is the seller of, rather than the investor in, securities and
agrees to repurchase them at an agreed-upon time and price. Use of a reverse
repurchase agreement may be preferable to a regular sale and later repurchase of
securities because it avoids certain market risks and transaction costs.

         At the time when a Fund enters into a binding obligation to purchase
securities on a when-issued basis or enters into a reverse repurchase agreement,
liquid assets (cash, U.S. Government securities or other "high-grade" debt
obligations) of the Fund having a value at least as great as the purchase price
of the securities to be purchased will be segregated on the books of the Fund
and held by the custodian throughout the period of the obligation. The use of
these investment strategies, as well as borrowing under a line of credit as
described below, may increase net asset value fluctuation.

ILLIQUID SECURITIES


         Global Convertible Fund and Global Convertible Technology Fund may each
invest up to 15% of its total assets, and each other Fund may invest up to 10%
of its total assets, taken at market value, in illiquid securities, including
any securities that are not readily marketable either because they are
restricted securities or for other reasons. Restricted securities are securities
that are subject to restrictions on resale because


                                      B-16

<PAGE>   111


they have not been registered for sale under the Securities Act of 1933. A
position in restricted securities might adversely affect the liquidity and
marketability of a portion of the Fund's portfolio, and the Fund might not be
able to dispose of its holdings in such securities promptly or at reasonable
prices. In those instances where a Fund is required to have restricted
securities held by it registered prior to sale by the Fund and the Fund does not
have a contractual commitment from the issuer or seller to pay the costs of such
registration, the gross proceeds from the sale of securities would be reduced by
the registration costs and underwriting discounts. Any such registration costs
are not included in the percentage limitation on a Fund's investment in
restricted securities. The Funds do not intend to invest in illiquid securities
during the next fiscal year, except that the Funds may invest in options traded
on the NASDAQ National Market System.


TEMPORARY INVESTMENTS

         Each Fund may make temporary investments without limitation when the
investment manager determines that a defensive position is warranted. Such
investments may be in money market instruments, consisting of obligations of, or
guaranteed as to principal and interest by, the U.S. Government or its agencies
or instrumentalities; certificates of deposit, bankers' acceptances and other
obligations of domestic banks having total assets of at least $500 million and
which are regulated by the U.S. Government, its agencies or instrumentalities;
commercial paper rated in the highest category by a recognized rating agency;
and repurchase agreements.

REPURCHASE AGREEMENTS

         As part of its strategy for the temporary investment of cash, each Fund
may enter into "repurchase agreements" pertaining to U.S. Government securities
with member banks of the Federal Reserve System or primary dealers (as
designated by the Federal Reserve Bank of New York) in such securities. A
repurchase agreement arises when a Fund purchases a security and simultaneously
agrees to resell it to the vendor at an agreed upon future date. The resale
price is greater than the purchase price, reflecting an agreed upon market rate
of return that is effective for the period of time the Fund holds the security
and that is not related to the coupon rate on the purchased security. Such
agreements generally have maturities of no more than seven days and could be
used to permit a Fund to earn interest on assets awaiting long term investment.
The Funds require continuous maintenance by the custodian for the Fund's account
in the Federal Reserve/Treasury Book Entry System of collateral in an amount
equal to, or in excess of, the market value of the securities that are the
subject of a repurchase agreement. Repurchase agreements maturing in more than
seven days are considered illiquid securities. In the event of a bankruptcy or
other default of a seller of a repurchase agreement, the Fund could experience
both delays in liquidating the underlying security and losses, including: (a)
possible decline in the value of the underlying security during the period while
the Fund seeks to enforce its rights thereto; (b) possible subnormal levels of
income and lack of access to income during this period; and (c) expenses of
enforcing its rights.


NON-DIVERSIFIED FUND

         The Global Convertible Technology Fund is a non-diversified investment
company. As such, the investment manager may establish large individual
positions for the Fund, sometimes representing more than 5% of the Fund's total
assets. Therefore, the Fund may be subject to greater risk and substantial
losses as a result of the performance of a small number of issuers. As a
non-diversified fund Global Convertible Technology Fund is not limited by the
Investment Company Act of 1940 (the "1940 Act") as to the percentage of its
assets that it may invest in obligations of a single issuer. However, the Fund
will comply with the diversification requirements imposed by the Internal
Revenue Code for qualification as a regulated investment company. Accordingly,
the Fund will not: (i) purchase more than 10% of any class of voting securities
of any issuer; (ii) with respect to 50% of its total assets, purchase securities
of any issuer (other than U.S. Government Securities) if, as a result, more than
5%

                                      B-17
<PAGE>   112



of the total value of the Fund's assets would be invested in securities of that
issuer; and (iii) invest more than 25% of its total assets in a single issuer
(other than U.S. Government Securities).




                             INVESTMENT RESTRICTIONS


         Global Convertible Technology Fund has elected to be classified as a
non-diversified, open-end investment fund. Each other Fund has elected to be
classified as a diversified, open-end investment fund.

         The Funds operate under the following investment restrictions. A Fund
may not (except as indicated):

(i)      For each Fund other than Global Convertible Technology Fund, as to 75%
         of its assets, invest more than 5% of its total assets, taken at market
         value at the time of a particular purchase, in the securities of any
         one issuer, except that this restriction does not apply to securities
         issued or guaranteed by the United States Government or its agencies or
         instrumentalities;


(ii)     acquire more than 10%, taken at the time of a particular purchase, of
         the outstanding voting securities of any one issuer;

(iii)    act as an underwriter of securities, except insofar as it may be deemed
         an underwriter for purposes of the Securities Act of 1933 on
         disposition of securities acquired subject to legal or contractual
         restrictions on resale;

(iv)     purchase or sell real estate (although it may purchase securities
         secured by real estate or interests therein, or securities issued by
         companies which invest in real estate or interests therein),
         commodities or commodity contracts;

(v)      make loans, but this restriction shall not prevent the Fund from (a)
         investing in debt obligations, (b) investing in repurchase agreements
         or (c) lending portfolio securities;


(vi)     invest more than 10% (or 15% in the case of Global Convertible Fund and
         Global Convertible Technology Fund) of the Fund's net assets (taken at
         market value at the time of each purchase) in illiquid securities,
         including repurchase agreements maturing in more than seven days;


(vii)    borrow, except that the Fund may (a) borrow up to 10% of its total
         assets, taken at market value at the time of such borrowing, as a
         temporary measure for extraordinary or emergency purposes, but not to
         increase portfolio income (the total of reverse repurchase
         agreements1and such borrowings will not exceed 10% of total assets, and
         the Fund will not purchase securities when its borrowings exceed 5% of
         total assets) and (b) enter into transactions in options;

(viii)   invest in a security if more than 25% of its total assets (taken at
         market value at the time of a particular purchase) would be invested in
         the securities of issuers in any particular industry, except that this
         restriction does not apply to securities issued or guaranteed by the
         U.S. Government or its agencies or instrumentalities; or

(ix)     issue any senior security, except that the Market Neutral Fund may sell
         securities short.


                                      B-18
<PAGE>   113

         The above restrictions are fundamental policies and may not be changed
with respect to a Fund without the approval of a "majority" of the outstanding
shares of that Fund, which for this purpose means the approval of the lesser of
(a) more than 50% of the outstanding voting securities of that Fund or (b) 67%
or more of the outstanding shares if the holders of more than 50% of the
outstanding shares of that Fund are present or represented at the meeting by
proxy.


         In addition to the fundamental restrictions listed above, and as a
non-fundamental policy, no Fund may:


         (a) invest in shares of other open-end investment companies (except in
connection with a plan of merger or reorganization);

         (b) invest in companies for the purpose of exercising control or
management;

         (c) purchase securities on margin (except for use of such short-term
credits as are necessary for the clearance of transactions, including
transactions in options, futures and options on futures), or participate on a
joint or a joint and several basis in any trading account in securities, except
in connection with transactions in options, futures and options on futures;

         (d) make short sales of securities, except that a Fund may make short
sales of securities (i) if the Fund owns an equal amount of such securities, or
owns securities that are convertible or exchangeable, without payment of further
consideration, into an equal amount of such securities and (ii) Market Neutral
Fund may make short sales of securities other than those described in clause
(i), provided that no more than 10% of its net assets would, when added
together, be deposited with brokers as collateral or allocated to segregated
accounts in connection with short sales other than those described in clause
(i);


         (e) invest more than 25% of its net assets (valued at time of purchase)
in securities of foreign issuers (other than securities represented by American
Depositary Receipts and securities guaranteed by a U.S. person), except that
Global Convertible Fund and Global Convertible Technology Fund each may invest
all of its assets in securities of foreign issuers.

         Global Convertible Technology Fund may not, as a non-fundamental
policy:

         (a) With respect to 50% of its total assets, purchase securities of any
issuer (other than securities issued or guaranteed by the U.S. Government or its
agencies or instrumentalities) if, as a result, more than 5% of the total value
of the Fund's assets would be invested in securities of that issuer; or

         (b) Invest more than 25% of its total assets in a single issuer (other
than securities issued or guaranteed by the U.S. Government or its agencies or
instrumentalities).

         The non-fundamental investment restrictions above may be changed by the
board of trustees without shareholder approval.

         Notwithstanding the foregoing investment restrictions, a Fund may
purchase securities pursuant to the exercise of subscription rights, subject to
the condition, for each Fund other than Global Convertible Technology Fund, that
such purchase will not result in the Fund's ceasing to be a diversified
investment company. Far Eastern and European corporations frequently issue
additional capital stock by means of subscription rights offerings to existing
shareholders at a price substantially below the market price of the shares. The
failure to exercise such rights would result in the Fund's interest in the
issuing company being diluted. The market for such rights is not


                                      B-19
<PAGE>   114

well developed in all cases and, accordingly, the Fund may not always realize
full value on the sale of rights. The exception applies in cases where the
limits set forth in the investment restrictions would otherwise be exceeded by
exercising rights or would have already been exceeded as a result of
fluctuations in the market value of the Fund's portfolio securities with the
result that the Fund would be forced either to sell securities at a time when it
might not otherwise have done so, to forego exercising the rights.


                                   MANAGEMENT

TRUSTEES AND OFFICERS

 Set forth below is information about the trustees and officers of the Trust.


<TABLE>
<CAPTION>

Name, Position(s) with Trust
and Age at March 31, 2000                     Principal Occupation(s) During Past Five Years
----------------------------                  ----------------------------------------------

<S>                                           <C>
John P. Calamos (1)                           President, Calamos Asset Management, Inc.("CAM"), an investment
   Trustee and President, 59                  adviser and the Funds' investment adviser; President, Calamos
                                              Financial Services, Inc. ("CFS"), a broker-dealer and the Funds'
                                              distributor.

Nick P. Calamos (1)                           Managing Director and Senior Vice President, CAM and CFS.
   Trustee and Vice President, 38

Richard J. Dowen (2)                          Professor of Finance, Northern Illinois University.
   Trustee, 55

Robert Frost (2)                              Management Consultant, ECOM Consultants, Inc.
   Trustee, 60


</TABLE>


                                      B-20
<PAGE>   115



<TABLE>

<S>                                           <C>
William A. Kaun (2)                           Principal, W.A. Kaun Co. (investment adviser and publisher).
   Trustee, 72

Rhowena Blank                                 Vice President -Operations, CAM, since 1999; Director of Operations,
   Treasurer, 31                              Christian Brothers Investment Services, 1998 - 1999; Audit Manager,
                                              Ernst & Young, LP, 1994 - 1998.

James S. Hamman, Jr.                          Senior Vice President and General Counsel, CAM, since 1998;  Vice
   Secretary, 30                              President and Associate Counsel, Scudder Kemper Investments, Inc.
                                              (investment manager), 1996 - 1998;  attorney, Vedder, Price, Kaufman &
                                              Kammholz, prior thereto.
</TABLE>


----------------------
(1)      John P. Calamos and Nick P. Calamos are trustees who are "interested
         persons" of the Trust as defined in the Investment Company Act of 1940
         (the "1940 Act") and are members of the executive committee of the
         board of trustees, which has authority during intervals between
         meetings of the board of trustees to exercise the powers of the board.

(2)      Messrs. Dowen, Frost and Kaun are members of the audit committee of the
         board of trustees, which makes recommendations regarding the selection
         of the Trust's independent auditors and meets with representatives of
         the independent auditors to determine the scope and review the results
         of each audit.

The trustees of the Trust are also trustees of Calamos Advisors Trust, an
open-end investment company advised by Calamos Asset Management, Inc.

         The address of Mr. Dowen is Department of Finance, Northern Illinois
University, DeKalb, Illinois 60115; that of Mr. Frost is 53 Ward Drive, New
Rochelle, New York 10804; and that of Mr. Kaun is 1750 Grandstand Place, Elgin,
Illinois 60123. The address of the officers of the Trust is 1111 East
Warrenville Road, Naperville, Illinois 60563-1493. Nick Calamos is a nephew of
John Calamos.


                                      B-21
<PAGE>   116



         The following table shows the compensation paid by the Trust for the
year ended March 31, 2000 to each trustee who was not an "interested person" of
the Trust. The information in the last column is for the 1999 calendar year.




<TABLE>
<CAPTION>

                                                   Aggregate                    Total Compensation
                                                   Compensation                 from Calamos
                  Name of Trustee                  from the Trust*              Funds Complex
                  ---------------                  --------------               -------------
<S>                                                <C>                          <C>
                  Richard J. Dowen*                $                                    $

                  Robert Frost                     $                                    $

                  William A. Kaun*                 $                                    $
                  ----------------------
</TABLE>




* Includes deferred fees pursuant to a deferred compensation plan with Calamos
Funds. Deferred amounts are treated as though such amounts have been invested
and reinvested in shares of one or more of the Calamos Funds selected by the
trustee. Total deferred amounts payable from the Trust through the Trust's
fiscal year are $   for Mr. Dowen and $   for Mr. Kaun.


Trustees who are "interested" persons of the Trust, as well as officers of the
Trust, are compensated by the Adviser and not by the Trust. The Trust does not
provide any pension or retirement benefits to its trustees.


         Employees of CAM and CFS are permitted to make personal securities
transactions, including transactions in securities that the Funds may purchase,
sell or hold, subject to requirements and restrictions set forth in the Code of
Ethics of CAM and CFS. The Code of Ethics contains provisions and requirements
designed to identify and address certain conflicts of interest between personal
investment activities of CAM and CFS employees and the interests of investment
advisory clients such as the Funds. Among other things, the Code of Ethics
prohibits certain types of transactions absent prior approval, imposes time
periods during which personal transactions may not be made in certain
securities, and requires the submission of duplicate broker confirmations and
statements and quarterly reporting of securities transactions. Additional
restrictions apply to portfolio managers, traders, research analysts and others
involved in the investment advisory process. Exceptions to these and other
provisions of the Code of Ethics may be granted in particular circumstances
after review by appropriate personnel.



                          INVESTMENT ADVISORY SERVICES



         Investment management and administrative services are provided to the
Funds by Calamos Asset Management, Inc. (the "Adviser") pursuant to an
Investment Management Agreement (the "Agreement") dated July 5, 1988. See the
prospectus - "Management of the Funds --." Each Fund pays the Adviser a fee
accrued daily and paid monthly. Growth Fund pays a fee at the annual rate of 1%
of the first $500 million of the Fund's average net assets, .90% of the next
$500 million of average net assets, and .80% of average net assets in excess of
$1 billion. Global Convertible Fund, and Global Convertible Technology Fund each
pays a fee at the annual rate of 1% of average net assets. High Yield Fund pays
a fee at the annual rate of .75% of average net assets. Each other Fund pays a
fee at the annual rate of .75% of the first $500 million of average net assets,
 .70% of the next $500 million of average net assets, and .65% of average net
assets in excess of $1 billion.


                                      B-22
<PAGE>   117



         During the periods shown below, the Funds (other than the Convertible
Technology Fund which is expected to commenced operations on or about August 1,
2000) paid total advisory fees and were reimbursed by the Adviser for expenses
in excess of applicable expense limitations as follows:


                                      B-23

<PAGE>   118



<TABLE>
<CAPTION>
                                                 Year                      Year                  Year
                                                 Ended                     Ended                 Ended
                                                 -----                     -----                 -----
                                                3/31/00                   3/31/99               3/31/98
<S>                                            <C>                       <C>                   <C>
        Convertible Fund                       $                         $932,218              $579,633

         Convertible Growth and Income Fund
              Advisory fee                     $                         $140,713               $92,242

         Market Neutral Fund

              Advisory fee                     $                          $11,670               $ 9,079
              Waiver or reimbursement                                      66,727                49,904
                                                                         --------              --------
              Net fee                          $                         $(55,057)             $(40,825)
         Growth Fund

              Advisory fee                     $                         $126,233               $92,400
              Waiver or reimbursement                                      50,313                28,816
                                                                         --------               -------
              Net fee                          $                         $ 75,920               $63,584
         Global Convertible Fund
              Advisory Fee                     $                         $ 72,674               $49,105
              Waiver or reimbursement                                      85,674                51,658
                                                                         --------               -------
              Net Fee                          $                         $(13,000)              $(2,553)
         High Yield Fund*
              Advisory Fee                     $
              Waiver or reimbursement
              Net Fee                          $

         ----------------------
</TABLE>





         *   High Yield Fund commenced operations on August 1, 1999.


         The Agreement continues in effect with respect to each Fund from year
to year so long as such continuation is approved at least annually by (1) the
board of trustees or the vote of a majority of the outstanding voting securities
of the Fund, and (2) a majority of the trustees who are not interested persons
of any party to the Agreement, cast in person at a meeting called for the
purpose of voting on such approval. The Agreement may be terminated as to a Fund
at any time, without penalty, by either the Trust or the Adviser upon 60 days'
written notice, and is automatically terminated in the event of its assignment
as defined in the 1940 Act.

         The use of the name "Calamos" in the name of the Trust and in the names
of the Funds are pursuant to licenses granted by the Adviser, and the Trust has
agreed to change the names to remove those references if the Adviser ceases to
act as investment adviser to the Funds.



                                      B-24
<PAGE>   119

EXPENSES

         Subject to the expense limitations described below, the Funds pay all
their own operating expenses that are not specifically assumed by the Adviser,
including (i) fees of the investment adviser; (ii) interest, taxes and any
governmental filing fees; (iii) compensation and expenses of the trustees, other
than those who are interested persons of the Trust, the investment adviser or
the distributor; (iv) legal, audit, custodial and transfer agency fees and
expenses; (v) fees and expenses related to the organization of the Funds and
registration and qualification of the Funds and their shares under federal and
state securities laws; (vi) expenses of printing and mailing reports, notices
and proxy material to shareholders, and expenses incidental to meetings of
shareholders; (vii) expenses of preparing prospectuses and of printing and
distributing them to existing shareholders; (viii) insurance premiums; (ix)
litigation and indemnification expenses and other extraordinary expenses not
incurred in the normal course of the business of the Trust; (x) distribution
expenses pursuant to the Funds' Distribution Plans; and (xi) brokerage
commissions and other transaction-related costs.


         The Adviser has voluntarily undertaken to reimburse each class of
shares for any annual operating expenses through August 31, 2001 in excess of
certain limits as described in the prospectus under "-Who Manages the Funds?."



                                DISTRIBUTION PLAN


         The Trust has adopted a plan pursuant to rule 12b-1 under the
Investment Company Act of 1940 (the "Plans"), whereby Class A shares, Class B
shares and Class C shares of each Fund pay to Calamos Financial Services, Inc.,
the Funds' distributor ("CFS"), service and distribution fees as described in
the prospectus.

         The board of trustees of the Trust has determined that a continuous
cash flow resulting from the sale of new Class A shares, Class B shares and
Class C shares is necessary and appropriate to meet redemptions and to take
advantage of buying opportunities without having to make unwarranted
liquidations of portfolio securities. The board also considered that continuing
growth in the size of the Funds would be in the best interests of shareholders
because increased size would allow the Funds to realize certain economies of
scale in their operations and would likely reduce the proportionate share of
expenses borne by each shareholder. The board of trustees therefore determined
that it would benefit each of the Funds to have monies available for the direct
distribution and service activities of CFS, as the Funds' distributor, in
promoting the continuous sale of the Funds' shares. The board of trustees,
including the non-interested trustees, concluded, in the exercise of their
reasonable business judgment and in light of their fiduciary duties, that there
is a reasonable likelihood that the Plans will benefit the Funds and their
shareholders.

         The Plan has been approved by the board of trustees, including all of
the trustees who are non-interested persons as defined in the 1940 Act. The
substance of the Plan has also been approved by the vote of a majority of the
outstanding shares of each of the Funds. The Plan must be reviewed annually and
may be continued from year to year by vote of the board of trustees, including a
majority of the trustees who are non-interested persons of the Funds and who
have no direct or indirect financial interest in the operation of the Plan
("non-interested trustees"), cast in person at a meeting called for that
purpose. It is also required that the selection and nomination of non-interested
trustees be done by non-interested trustees. The Plan and any distribution or
service agreement may be terminated at any time, without any penalty, by such
trustees, by any act that terminates the distribution agreement between the
Trust and CFS, or, as to any Fund, by vote of a majority of that Fund's
outstanding shares. Any agreement related to the Plan, including any
distribution or service agreement, may be terminated in the same manner, except
that termination by a majority of the outstanding shares must be on not more
than 60 days' written

                                      B-25
<PAGE>   120



notice to any other party to such agreement. Any distributor, dealer or
institution may also terminate its distribution or service agreement at any time
upon written notice.

         Neither the Plan nor any distribution or service agreement may be
amended to increase materially the amount spent for distribution or service
expenses or in any other material way without approval by a majority of the
outstanding shares of the affected Fund, and all such material amendments to the
Plan or any distribution or service agreement must also be approved by the
non-interested trustees, in person, at a meeting called for the purpose of
voting on any such amendment.

                                      B-26



<PAGE>   121
         CFS is required to report in writing to the board of trustees at least
quarterly on the amounts and purpose of any payments made under the Plan and any
distribution or service agreement, as well as to furnish the board with such
other information as may reasonably be requested in order to enable the board to
make an informed determination of whether the Plan should be continued. Payments
by a Fund pursuant to the Plan are not intended to finance distribution of
shares of the other Funds.


         During the year ended March 31, 2000, each of the Funds (other than
Global Convertible Technology Fund, which is expected to commence operations on
or about August 1, 2000) made payments to CFS pursuant to the Plan in the
following amounts:



<TABLE>
<CAPTION>

                                                          Market                    Global          High
       Convertible        Convertible Growth              Neutral      Growth      Convertible      Yield
          Fund             and Income Fund                 Fund         Fund          Fund          Fund
     ---------------      -------------------            ---------    --------    -------------    -------
    <S>                  <C>                             <C>         <C>          <C>             <C>
       $                  $                                  $          $             $             $    *
</TABLE>



       *For period August 1, 1999 through March 31, 2000.



         PURCHASING AND REDEEMING SHARES

         Purchases and redemptions are discussed in the Funds' prospectus under
the headings "How Can I Buy Shares?" and "How Can I Sell Shares?" All of that
information is incorporated herein by reference.

         You may purchase or redeem shares of the Funds through certain
investment dealers, banks or other intermediaries ("Intermediaries"). These
Intermediaries may charge for their services. Any such charges could constitute
a substantial portion of a smaller account, and may not be in your best
interest. You may purchase or redeem shares of the Funds directly from or with
the Trust without any charges other than those described in the prospectus.

         An Intermediary, who accepts orders that are processed at the net asset
value next determined after receipt of the order by the Intermediary, accepts
such orders as agent of the Trust. The Intermediary is required to segregate any
orders received on a business day after the close of regular session trading on
the New York Stock Exchange and transmit those orders separately for execution
at the net asset value next determined after that business day.

HOW TO PURCHASE SHARES
Shares of the Funds are sold through selected broker-dealers and banks that have
signed agreements with CFS, or may be purchased by check or wire as described
below. The minimum initial investment by a shareholder is $500 and $50
thereafter. Each Fund reserves the right to reject any order for the purchase of
its shares in whole or in

                                      B-29

<PAGE>   122


part, and to suspend the sale of its shares to the public in response to
conditions in the securities markets or otherwise. Each purchase of shares is
confirmed by a written statement mailed to the shareholder, without issuance of
share certificates.

OFFERING PRICE

Class A shares of each Fund are sold to investors at net asset value plus a
sales charge, which may be reduced or waived as described below. Class B shares
are sold without an initial sales charge but are subject to higher ongoing
expenses than Class A shares of the same Fund, and a contingent deferred sales
charge payable upon certain redemptions. Class C shares of each Fund are sold
without an initial sales charge but are subject to higher ongoing expenses than
Class A shares of the same Fund. When placing an order, you must specify whether
the order is for Class A, Class B or Class C shares.

The differences between Class A shares, Class B shares and Class C shares lie
primarily in their initial and contingent deferred sales charge structures and
in their asset-based sales charges in the form of Rule 12b-1 distribution fees.
These differences are summarized in the table below. See also "Expenses" and
"How to Redeem Shares." Each class has distinct advantages and disadvantages for
different investors, and you may choose the class that best suits your
circumstances and objectives.



<TABLE>
<CAPTION>

                                                            Annual 12b-1 Fees
                                                           (as a % of average
Class                         Sales Charge                  daily net assets)*              Other Information
-----                 -----------------------------        ---------------------     -----------------------------
<S>                  <C>                                  <C>                       <C>
                      Maximum initial sales charge               .25%                Initial sales charge waived or
Class A               of 4.75% of offering price                                     reduced for certain purchases*


                      Maximum  contingent   deferred                                 Shares   convert   to   Class  A
Class B               sales    charge   of   5%   of            1.00%**              shares 8 years after issuance
                      redemption proceeds;  declines
                      to zero after 6 years

Class C               1%  deferred  sales  charge on            1.00%***             No conversion feature
                      shares   redeemed  within  one
                      year
</TABLE>


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

*   See the note to the following table.
**  The 12b-1 fee of 1% for the first year is advanced to the Selling Dealer by
    CFS from its own resources at the time of investment. Annual 12b-1 fees are
    paid quarterly in arrears beginning in the second year. Of this amount, .25%
    is for administrative services and the balance is for distribution services.


                                      B-30
<PAGE>   123


The sales charges on sales of Class A shares of each Fund (except when waived as
described below under "How to Purchase Shares - Sales Charge Waiver") are as
follows:





<TABLE>
<CAPTION>

                                                Sales Charge Paid by Investor on Purchase of Class A Shares
                                                -----------------------------------------------------------

                                             As a % of                As a % of            % of Offering Price
                                        Net Amount Invested         Offering Price       Retained by Selling Dealer
                                        -------------------         --------------       --------------------------

<S>                                      <C>                      <C>                        <C>
Less than $50,000................                 4.99%                    4.75%                      4.00%
$50,000 but less than $100,000                    4.44                     4.25                       3.50
$100,000 but less than $250,000                   3.63                     3.50                       2.75
$250,000 but less than $500,000                   2.56                     2.50                       2.00
$500,000 but less than $1,000,000                 2.04                     2.00                       1.60
$1,000,000 or more*...............                None                     None                       None
</TABLE>

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

*  On an investment of $1 million or more, CFS from its own resources pays the
   selling dealer a commission of .50% of the amount of the investment, subject
   to repayment of the commission if the shares are redeemed within one year
   after purchase. If you purchase such shares without a sales charge (other
   than by reinvestment of dividends or distributions and redeem them within two
   years, a contingent deferred sales charge will be imposed at the rate of 1%
   on shares redeemed within one year after purchase, and, if you purchased
   shares after July 31, 2000, 50% on shares redeemed during the second year
   after purchase), determined on a first-in, first-out basis.

Each Fund receives the entire net asset value of all of its Class A shares sold.
CFS, the Funds' principal underwriter, retains the sales charge on sales of
Class A shares from which it allows discounts from the applicable public
offering price to investment dealers. The normal discount to dealers is set
forth in the above table. Upon notice to all dealers with whom it has sales
agreements, CFS may allow up to the full applicable sales charge, as shown in
the above table, during periods and for transactions specified in such notice
and such reallowances may be based upon attainment of minimum sales levels.
Dealers who receive 90% or more of the sales charge may be deemed to be
underwriters under the Securities Act of 1933. CFS retains the entire amount of
any deferred sales charge on Class C shares redeemed within one year of
purchase. CFS may from time to time conduct promotional campaigns in which
incentives would be offered to dealers meeting or exceeding stated target sales
of shares of a Fund. The cost of any such promotional campaign, including any
incentives offered, would be borne entirely by CFS and would have no effect on
either the public offering price of Fund shares or the percentage of the public
offering price retained by the selling dealer.

CFS compensates firms for sales of Class B shares at the time of sale at a
commission rate of up to 4.00% of the amount of Class B shares purchased. CFS is
compensated by each Fund for services as distributor and principal underwriter
for Class B shares. Class B shares of a Fund will automatically convert to Class
A shares of the same Fund eight years after issuance on the basis of the
relative net asset value per share. The purpose of the conversion feature is to
relieve holders of Class B shares from the 12b-1 fee when they have been
outstanding long enough for CFS to have been compensated for distribution
related expenses. For purposes of conversion to Class A shares, shares purchased
through the reinvestment of dividends and other distributions paid with respect
to Class B shares in a shareholder's Fund account will be converted to Class A
shares on a pro rata basis.

WHICH CLASS OF SHARES SHOULD YOU PURCHASE?
The decision as to which class of shares you should purchase depends on a number
of factors, including the amount and intended length of the investment.
Investors making investments that qualify for reduced sales charges might
consider Class A shares. Investors who prefer not to pay an initial sales charge
and who plan to hold their investment for more than eight years might consider
Class B shares. Investors who prefer not to pay an initial sales


                                      B-31

<PAGE>   124



charge but who plan to redeem their shares within eight years might consider
Class C shares. Orders for Class B shares or Class C shares for $500,000 or more
will be declined. For more information about the three share classes, consult
your financial representative or the Transfer Agent. Financial services firms
may receive different compensation depending upon which class of shares they
sell.


PURCHASES BY WIRE

You may also purchase shares by wiring funds from your bank. To insure proper
credit to your account, please call the Funds at (800) 823-7386 before sending
your wire. The wire should be sent to Boston Safe Deposit & Trust; ABA
#011001234; for First Data Corp. Investor Services Group, bank account no.
010308; FBO Calamos [fund name] Fund; [shareholder name and account number]. The
applicable offering price for a purchase by wire is the offering price per share
next determined after receipt of the wired funds. Receipt of a wire could be
delayed by delays on the Federal Reserve wire system. After you have wired
funds, you must complete the application form and send it to CFS. A Fund will
not honor redemption requests until the completed application has been received,
and failure to submit a completed application may result in backup withholding
as required by the Internal Revenue Code.


PURCHASES BY MAIL

You may also purchase shares of a Fund by sending a check payable to the Fund,
along with information identifying you and your account number to the Fund's
transfer agent: First Data Investor Services Group, Inc., 211 South Gulph road,
P.O. Box 61767, King of Prussia, PA 19406. An initial investment made by check
must be accompanied by a completed application. A subsequent investment may be
made by detaching the stub from your account statement and sending it with your
check in the envelope provided with your statement. All checks must be drawn on
a U.S. bank in U.S. funds. A check written by a third party will not be
accepted. A charge ($20 minimum) may be imposed if any check submitted for
investment does not clear. If you purchase shares by check, you will not be able
to redeem the shares until the check has been collected, which may take 15 days.


PURCHASES BY EXCHANGE
You may purchase shares of a Fund by exchange of shares from another Fund, by
exchange of shares of Money Market Portfolio, a portfolio of Cash Account Trust
(such shares are referred to as "Cash Account Shares") either by mail or by
instructing your broker-dealer or other sales agent, who will communicate your
order to the Trust's transfer agent. If you have a brokerage account with
Merrill Lynch, Pierce, Fenner & Smith Incorporated ("Merrill Lynch") that holds
shares of Summit Cash Reserves Fund, a series of Financial Institution Series
Trust (such shares are referred to as "Summit Fund Shares"), and the Summit Fund
Shares were purchased by exchange from a Fund, you may purchase shares of a Fund
through your Merrill Lynch broker by exchange of Summit Fund Shares. See "How to
Redeem Shares - Redemption by Exchange." YOU MAY NOT MAKE MORE THAN FOUR
EXCHANGES FROM ANY FUND DURING ANY CALENDAR YEAR. No sales charge is imposed on
purchases of Class A shares by exchange of Class A shares from another Fund or
by exchange of Cash Account Shares or Summit Fund Shares, previously purchased
through use of the exchange privilege. Please review the information under "How
to Redeem Shares - Redemption by Exchange."

SALES CHARGE WAIVER

Dividends and distributions paid on shares of a Fund will be reinvested in
shares of the same class of that Fund at net asset value (without the payment of
any sales charge) unless you elect to receive dividends and distributions in
cash. Proceeds of shares redeemed by a Fund within the previous 60 days also may
be reinvested in shares of the same class of that Fund at net asset value
without the payment of any sales charge.

                                      B-32

<PAGE>   125


In addition, the following persons or entities may purchase Class A shares of a
Fund at net asset value without payment of any sales charge, upon written
assurance that the purchase is made for investment purposes and that the shares
will not be sold except through redemption by the Fund: (a) any investor
purchasing shares upon the recommendation of an investment consultant to whom
the investor pays a fee for services relating to investment selection; (b) any
investor purchasing shares through an investment advisory account with the
Adviser or through a brokerage account with CFS over which CFS has investment
discretion; (c) any investor purchasing shares in a non-discretionary,
non-advisory, asset-based-fee brokerage account of a broker dealer having a
selling group agreement with CFS; (d) any investor purchasing shares by exchange
of Cash Account Shares or Summit Fund Shares previously purchased through use of
the exchange privilege; (e) any employee benefit plan having more than 200
eligible employees or a minimum of $1 million of plan assets invested in the
Funds; (f) any employee benefit plan purchasing shares through an intermediary
that has signed a participation agreement with CFS specifying certain asset
minimums and qualifications, and marketing, program and trading restrictions;
(g) any insurance company separate account used to fund annuity contracts for
employee benefit plans having in the aggregate more than 200 eligible employees
or a minimum of $1 million of plan assets invested in the Funds; (h) any
employee or registered representative of CFS, one of its affiliates or a
broker-dealer with a selling group agreement with CFS; (i) any trustee of the
Trust; (j) any member of the immediate family of a person qualifying under (h)
or (i), including a spouse, child, stepchild, sibling, parent, stepparent,
grandchild and grandparent, in each case including in-law and adoptive
relationships; (k) any trust, pension, profit sharing, or other benefit plan in
which any person qualifying under (h) is a participant; (l) any 401(k) plan
(cash or deferred arrangement intended to qualify under section 401(k) of the
Internal Revenue Code) or other qualified retirement plan to which a person
qualifying under (h), (i) or (j) makes voluntary contributions and has
investment self-direction, provided the purchase is for the account of such
person; (m) any company exchanging shares with a Fund pursuant to a merger,
acquisition or exchange offer; and (n) any investor buying shares through a
brokerage account with a broker-dealer who has waived the initial sales charge
to which the broker-dealer otherwise would be entitled. Please note that, if you
purchase or redeem shares through a broker or dealer, the broker or dealer may
charge a fee for effecting the transaction.


Further, no sales charge will be imposed on the sale of Class A shares of a Fund
purchased and paid for with the proceeds of shares redeemed in the prior 12
months from a mutual fund on which an initial sales charge or contingent
deferred sales charge was paid, provided a waiver of the sales charge is
requested when the purchase order for Fund shares is placed, any requested
evidence of eligibility for the sales charge waiver is furnished; and any
shareholder of Convertible Fund at April 30, 1992, the date on which that Fund
became a series of the Trust and sales of Fund shares became subject to a sales
charge, may continue to purchase Class A shares of Convertible Fund without a
sales charge if the Fund or participating broker is notified at the time of each
qualifying purchase.

RIGHTS OF ACCUMULATION
The sales charges described above also apply on a cumulative basis to Class A
shares of the Funds and any other series of the Trust as to which a sales charge
applies, and over any period of time. Therefore, the value of all your Class A
shares of a Fund and any other series of the Trust with respect to which a sales
charge was paid, taken at the current offering price or original cost, whichever
is greater, can be combined with a current purchase to determine the applicable
offering price of the current purchase. In order to receive the cumulative
quantity reduction, you must give CFS or your dealer notification of the prior
purchases at the time of the current purchase.

LETTER OF INTENT
You may reduce the sales charges you pay on the purchase of Class A shares by
making investments pursuant to a letter of intent. The applicable sales charge
then is based upon the indicated amount intended to be invested during a
thirteen-month period in shares of the Funds as to which a sales charge would be
imposed and any other series of the Trust. You may compute the thirteen-month
period starting up to ninety days before the date of execution of

                                      B-33

<PAGE>   126


the letter of intent. Your initial investment must be at least 5% of the amount
your letter of intent indicates you intend to invest. Each investment made
during the period receives the reduced sales charge applicable to the total
amount of the intended investment. During the term of the letter of intent,
shares representing 5% of the indicated amount will be held in escrow. Shares
held in escrow have full dividend and voting privileges. The escrowed shares
will be released when the full amount indicated has been purchased. If the full
indicated amount is not purchased during the term of the letter of intent, you
will be required to pay CFS an amount equal to the difference between the dollar
amount of the sales charges actually paid and the amount of the sales charges
which you would have paid on your aggregate purchase if the total of such
purchases had been made at a single time, and CFS reserves the right to redeem
shares from your account if necessary to satisfy that obligation. A letter of
intent does not obligate you to buy or a Fund to sell the indicated amount of
the shares but you should read it carefully before signing. Additional
information is contained in the letter of intent included in the application.

HOW TO REDEEM SHARES

Shares of the Funds will be redeemed at the respective net asset value next
determined after receipt of a redemption request in good form on any day the New
York Stock Exchange is open for trading. Requests received after the time for
computation of a Fund's net asset value for that day will be processed the next
business day.


If Class C shares, or Class A shares for which the initial purchase price was $1
million or more, on which no initial sales charge was imposed are redeemed
within one year after purchase (other than by reinvestment of dividends or
distributions), determined on a first-in, first-out basis, a contingent deferred
sales charge of 1% of the purchase price will be imposed. A contingent deferred
sales charge of .50% of the purchase price will be imposed on the redemption
during the second year after purchase of Class A shares, where the initial
purchase price was $1 million or more.

CONTINGENT DEFERRED SALES CHARGE--CLASS B SHARES
A contingent deferred sales charge may be imposed upon redemption of Class B
shares. There is no such charge upon redemption of any share appreciation or
reinvested dividends on Class B shares. The charge is computed at the following
rates applied to the value of the shares redeemed excluding amounts not subject
to the charge.



<TABLE>
<CAPTION>

                                            Contingent
                                            Deferred
Year of Redemption                          Sales
After Purchase                              Charge
-------------------------                   -----------
<S>                                        <C>
First                                            5%
Second                                           4%
Third or Fourth                                  3%
Fifth                                            2%
Sixth                                            1%
</TABLE>



The contingent deferred sales charge will be waived: (a) in the event of the
total disability (as evidenced by a determination by the Social Security
Administration) of the shareholder (including a registered joint owner)
occurring after the purchase of the shares being redeemed, (b) in the event of
the death of the shareholder (including a registered joint owner), (c) for
redemptions made pursuant to a systematic withdrawal plan (see "Systematic
Withdrawal Plan" below), (d) for redemptions made pursuant to any IRA systematic
withdrawal based on the shareholder's life expectancy including, but not limited
to, substantially equal periodic payments described in


                                      B-34

<PAGE>   127



Internal Revenue Code Section 72(t)(2)(iv) prior to age 59 1/2 and (e) for
redemptions to satisfy required minimum distributions after age 70 1/2 from an
IRA account (with the maximum amount subject to this waiver being based only
upon the shareholder's Calamos IRA accounts).

CONTINGENT DEFERRED SALES CHARGE - GENERAL INFORMATION.
The following example will illustrate the operation of the contingent deferred
sales charge. Assume that you make a single purchase of $10,000 of a Fund's
Class B shares and that 18 months later the value of the shares has grown by
$1,000 through reinvested dividends and by an additional $2,000 of share
appreciation to a total of $13,000. If you were then to redeem the entire
$13,000 in share value, the contingent deferred sales charge would be payable
only with respect to $10,000 because neither the $1,000 or reinvested dividends
nor the $2,000 of share appreciation is subject to the charge. The charge would
be at the rate of 4% ($400) because it was in the second year after the purchase
was made.

The rate of the contingent deferred sales charge is determined by the length of
the period of ownership. Investments are tracked on a monthly basis. The period
of ownership for this purpose begins the first day of the month in which the
order for the investment is received. For example, an investment made in July,
2000 will be eligible for the second year's charge if redeemed on or after July
1, 2001. In the event no specific order is requested when redeeming shares
subject to a contingent deferred sales charge, the redemption will be made first
from shares representing reinvested dividends and then from the earliest
purchase of shares. CFS receives any contingent deferred sales charge directly.


REDEMPTION BY MAIL

A written request for redemption (and an endorsed share certificate, if issued)
must be received by the Trust's transfer agent at its address shown under
"Purchases by Mail" above to constitute a valid redemption request.


Your redemption request must:

1.    specify the Fund, your account number and the number of shares or dollar
      amount to be redeemed, if less than all shares are to be redeemed;

2.    be signed by all owners exactly as their names appear on the account; and

3.    include a signature guarantee for each signature on the redemption request
      by CFS, by a securities firm that is a member of the New York Stock
      Exchange, or by a bank, savings bank, credit union, savings and loan
      association or other entity that is authorized by applicable state law to
      guarantee signatures.

In the case of shares held by a corporation, the redemption request must be
signed in the name of the corporation by an officer whose title must be stated,
and a certified bylaw provision or resolution of the board of directors
authorizing the officer to so act may be required. In the case of a trust or
partnership, the signature must include the name of the registered shareholder
and the title of the person signing on its behalf. Under certain circumstances,
before shares can be redeemed, additional documents may be required in order to
verify the authority of the person seeking to redeem.

REDEMPTION BY WIRE OR TELEPHONE

Broker-dealers or other sales agents may communicate redemption orders by wire
or telephone to the Trust's transfer agent. These firms may charge for their
services in connection with your redemption request but the Funds do not impose
any such charges. Additionally, if your shares are held for you by the Trust's
transfer agent, you


                                      B-35

<PAGE>   128


may redeem up to $50,000 worth of shares by telephone, as described in the
prospectus under "How Can I Sell Shares?"


EXPEDITED REDEMPTION
Unless share certificates have been issued to you, you may have redemption
proceeds of at least $5,000 wired directly to a domestic commercial bank account
or brokerage account that you have previously designated. Normally, such
payments will be transmitted no later than the second business day following
receipt of your redemption request (provided redemptions may be made under the
general criteria set forth below). A $9 service charge for payment of redemption
proceeds by wire will be deducted from the proceeds.

REDEMPTION BY EXCHANGE
You may redeem all or any portion of your shares of a Fund and use the proceeds
to purchase shares of any of the other Funds or Cash Account Shares (or Summit
Fund Shares if your Fund shares are held in a brokerage account with Merrill
Lynch and Merrill Lynch has commenced offering the exchange program for Summit
Fund Shares) if your signed, properly completed application is on file. AN
EXCHANGE TRANSACTION IS A SALE AND PURCHASE OF SHARES FOR FEDERAL INCOME TAX
PURPOSES AND MAY RESULT IN CAPITAL GAIN OR LOSS. YOU MAY NOT MAKE MORE THAN FOUR
EXCHANGES FROM ANY FUND IN ANY CALENDAR YEAR. Before exchanging into Cash
Account Shares (or Summit Fund Shares), you should obtain the prospectus
relating to those shares from the Adviser (or from Merrill Lynch, in the case of
Summit Fund Shares) and read it carefully. The exchange privilege is not an
offering or recommendation of Cash Account Shares or Summit Fund Shares. The
registration of the account to which you are making an exchange must be exactly
the same as that of the account from which the exchange is made and the amount
you exchange must meet any applicable minimum investment of the fund being
purchased. An exchange may be made by following the redemption procedure
described above under "Redemption by Mail" and indicating the fund to be
purchased, except that a signature guarantee normally is not required. An
exchange may also be made by instructing your broker-dealer or other sales
agent, who will communicate your instruction to CAM. No sales charge is imposed
on purchases by exchange.

GENERAL
A check for proceeds of a redemption will not be released until the check used
to purchase the shares has been collected, which is usually no more than 15 days
after purchase. You may avoid this delay by purchasing shares through a wire
transfer of funds. A Fund may suspend the right of redemption under certain
extraordinary circumstances in accordance with the rules of the Securities and
Exchange Commission. Due to the relatively high cost of handling small accounts,
each Fund reserves the right upon 30 days' written notice to involuntarily
redeem, at net asset value, the shares of any shareholder whose account has a
value of less than $500, unless the reduction in value to less than $500 was the
result of market fluctuation. PLEASE TELEPHONE THE FUNDS IF YOU HAVE ANY
QUESTIONS ABOUT REQUIREMENTS FOR A REDEMPTION BEFORE SUBMITTING A REQUEST. YOU
MAY NOT CANCEL OR REVOKE YOUR REDEMPTION REQUEST ONCE YOUR INSTRUCTIONS HAVE
BEEN RECEIVED AND ACCEPTED.

SHAREHOLDER ACCOUNTS
Each shareholder of a Fund receives quarterly account statements showing
transactions in shares of the Fund and with a balance denominated in Fund
shares. A confirmation will be sent to the shareholder upon purchase,
redemption, dividend reinvestment, or change of shareholder address (sent to the
former address).

RETIREMENT PLANS
You may use the Funds as investments for your Individual Retirement Account
("IRA"), profit sharing or pension plan, Section 40l(k) plan, Section 403(b)(7)
plan in the case of employees of public school systems and certain


                                      B-36

<PAGE>   129


non-profit organizations, and certain other qualified plans. A master IRA plan
and information regarding plan administration, fees, and other details are
available from CFS and authorized broker-dealers.

SYSTEMATIC WITHDRAWAL PLAN

You may request that a Fund periodically redeem shares having a specified
redemption value and send you a check for the proceeds. In order to initiate the
Systematic Withdrawal Plan, call (800) 823-7826 and request a Systematic
Withdrawal form. Your account must have a share balance of $25,000 or more.
Withdrawal proceeds are likely to exceed dividends and distributions paid on
shares in your account and therefore may deplete and eventually exhaust your
account. The periodic payments are proceeds of redemption and are taxable as
such. The maximum annual rate at which Class B shares may be redeemed (and Class
C shares in their first year following purchase and Class A shares purchased in
amounts of $1,000,000 or more) under a systematic withdrawal plan is 10% of the
net asset value of the account. Because a sales charge is imposed on purchases
of shares of the Funds, you should not purchase shares while participating in
the Systematic Withdrawal Plan. You may modify or terminate your Systematic
Withdrawal Plan by written notice to the transfer agent at least seven business
days prior to the start of the month in which the change is to be effective.


AUTOMATIC BANK DRAFT PLAN
If you own shares of a Fund, you may purchase additional shares of that Fund
through the Automatic Bank Draft Plan. Under the Plan, the Trust will
automatically debit your bank checking account on a monthly or semi-monthly
basis in an amount ($50 or more) specified by you and invest the specified
amount in additional shares of the Fund. To obtain an Automatic Bank Draft Plan
form, call (800) 823-7386. The Plan is not available to clients of service
organizations that offer similar investment services.

EXCHANGE PRIVILEGE
You may exchange shares of any Fund for shares of another Fund or for Cash
Account Shares (or for Summit Fund Shares if your Fund shares are held in a
brokerage account with Merrill Lynch) or exchange Cash Account Shares or Summit
Fund Shares for shares of a Fund, without payment of any sales charge as
described above under "How to Purchase Shares - Purchase by Exchange" and "How
to Redeem Shares - Redemption by Exchange."

NET ASSET VALUE

         In computing the net asset value of each Fund, portfolio securities,
including options, that are traded on a national securities exchange and
securities reported on the NASDAQ National Market System are valued at the last
reported sales price. Securities traded in the over-the-counter market and
listed securities for which no sales were reported are valued at the mean of the
most recently quoted bid and asked prices. Each outstanding futures contract is
valued at the official settlement price for the contract on the exchange on
which the contract is traded, except that if the market price of the contract
has increased or decreased by the maximum amount permitted on the valuation date
("up or down the limit"), the contract is valued at a fair value as described
below. Short-term obligations with maturities of 60 days or less are valued at
amortized cost.

         When market quotations are not readily available for a Fund's
securities, such securities are valued at a fair value following procedures
approved by the board of trustees. These procedures include determining fair
value on the basis of valuations furnished by pricing services approved by the
board of trustees, which include market transactions for comparable securities
and various relationships between securities which are generally recognized by
institutional traders, as well as on the basis of appraisals received from a
pricing service using a computerized matrix system, or appraisals derived from
information concerning the securities or similar securities received from
recognized dealers in those securities.

                                      B-37

<PAGE>   130


         Each Fund's net asset value is determined only on days on which the New
York Stock Exchange (the "NYSE") is open for trading. That Exchange is regularly
closed on Saturdays and Sundays and on New Year's Day, the third Mondays in
January and February, Good Friday, the last Monday in May, Independence Day,
Labor Day, Thanksgiving and Christmas. If one of these holidays falls on a
Saturday or Sunday, the NYSE will be closed on the preceding Friday or the
following Monday, respectively.

         Securities that are principally traded in a foreign market are valued
as of the close of the appropriate exchange or other designated time. Trading in
securities on European and Far Eastern securities exchanges and over-the-counter
markets is normally completed at various times before the close of business on
each day on which the NYSE is open. Trading of these securities may not take
place on every NYSE business day. In addition, trading may take place in various
foreign markets on Saturdays or on other days when the NYSE is not open and on
which the Fund's net asset value is not calculated. Therefore, such calculation
does not take place contemporaneously with the determination of the prices of
many of the portfolio securities used in such calculation and the value of the
Fund's portfolio may be significantly affected on days when shares of the Fund
may not be purchased or redeemed.

REDEMPTION IN KIND

         The Funds have elected to be governed by Rule 18f-1 under the
Investment Company Act of 1940 pursuant to which they are obligated to redeem
shares solely in cash up to the lesser of $250,000 or 1% of the net asset value
of a Fund during any 90-day period for any one shareholder. Redemptions in
excess of these amounts will normally be paid in cash, but may be paid wholly or
partly by a distribution in kind of securities.



                             PERFORMANCE INFORMATION


TOTAL RETURN

         From time to time the Funds may quote total return figures. "Total
Return" for a period is the percentage change in value during a period of an
investment in Fund shares, including the value of shares acquired through
reinvestment of all dividends and capital gains distributions. "Average Annual
Total Return" is the average annual compounded rate of change in value
represented by the Total Return for the period.


                                      B-38

<PAGE>   131


         Average Annual Total Return will be computed as follows:

<TABLE>
<CAPTION>
<S><C>

                  ERV             =         P(1+T)(n)

                  Where:          P         =        a hypothetical initial investment of $1,000

                                  T         =        average annual total return

                                  n         =        number of years

                                  ERV       =        ending redeemable value of a hypothetical $1,000 investment
                                                     made at the beginning of the period, at the end of the
                                                     period (or fractional portion thereof)
</TABLE>



         Total Return (taking into account the effect of the sales charge) and
Average Annual Total Return for each of the Funds (other than Global Convertible
Technology Fund, which is expected to commence operations on or about August 1,
2000) was as shown below for the following periods ended March 31, 2000.



<TABLE>
<CAPTION>



                                                                                               Average Annual
                                                                Total Return                    Total Return
                                                         -----------------------------    -----------------------------

                                                         Class A    Class C    Class I    Class A    Class C    Class I
                                                         -------    -------    -------    -------    -------    -------
<S>                                                     <C>         <C>       <C>        <C>        <C>        <C>
     Convertible Fund
          One year......................................
          Five years....................................             N/A         N/A                  N/A         N/A
          Ten years.....................................             N/A         N/A                  N/A         N/A

          Life of Class (A Shares, 6/21/85;
              C Shares, 7/5/96; I Shares, 6/25/97)......

     Convertible Growth and Income Fund
          One year......................................
          Five years....................................             N/A         N/A                  N/A         N/A
          Ten years.....................................             N/A         N/A                  N/A         N/A

          Life of Class (A Shares, 9/22/88;
              C Shares, 7/5/96; I Shares, 6/25/97)......

     Market Neutral Fund
          One year......................................             N/A         N/A                  N/A         N/A
          Five years....................................             N/A         N/A                  N/A         N/A
          Life of Class (A shares, ___;.................             N/A         N/A                  N/A         N/A
              C shares, 2/16/00)........................

     Growth Fund
          One year......................................
          Five years....................................             N/A         N/A                  N/A         N/A
          Life of Class (A Shares, 9/4/90;
</TABLE>

                                      B-40

<PAGE>   132


<TABLE>
<CAPTION>
<S><C>

          C Shares, 9/3/96; I Shares, 9/18/97).........

     Global Convertible Fund
          One Year.....................................
          Life of Class (A Shares, 9/9/96;
          C Shares, 9/24/96; I Shares, 9/18/97)........

     High Yield Fund
          Life of Class (8/1/99).......................              N/A         N/A                  N/A         N/A
</TABLE>

------------------
   *Not annualized


                                      B-41
<PAGE>   133
YIELD

         Each Fund other than Growth Fund may also quote yield figures. The
yield of a Fund is calculated by dividing its net investment income per share (a
hypothetical figure as defined in SEC rules) during a 30-day period by the net
asset value per share on the last day of the period. The yield formula provides
for semiannual compounding, which assumes that net investment income is earned
and reinvested at a constant rate and annualized at the end of a six-month
period. The yield is not based on actual dividends paid.

         Yield will be computed as follows:

<TABLE>
<S>                       <C>      <C>

                  YIELD    =        2[((a-b/cd)+1)6-1]


                  Where:            a  = dividends and interest earned during
                                         the period


                                    b  = expenses accrued for the period (net
                                         of reimbursements)


                                    c  = the average daily number of shares
                                         outstanding during the period that were
                                         entitled to receive dividends


                                    d  = the maximum offering price per share
                                         on the last day of the period

</TABLE>


         The annualized yields of each Fund other than Growth Fund (and other
than Global Convertible Technology Fund which is expected to commence operations
on or about August 1, 2000) for the 30 days ended March 31, 2000 was as follows:

<TABLE>
<CAPTION>
                                                       Class A                   Class C                 Class I
----------------------------------------------------------------------------------------------------------------
<S>                                                    <C>                       <C>                     <C>
     Convertible Fund                                        %                         %                       %
----------------------------------------------------------------------------------------------------------------
     Convertible Growth and Income Fund                      %                         %                       %
----------------------------------------------------------------------------------------------------------------
     Market Neutral Fund                                     %                         %                     N/A
----------------------------------------------------------------------------------------------------------------
     Global Convertible Fund                                 %                         %                       %
----------------------------------------------------------------------------------------------------------------
     High Yield Fund                                         %                         N/A                   N/A
----------------------------------------------------------------------------------------------------------------
</TABLE>


         The figures quoted assume reinvestment of all dividends and
distributions. Quotations of Average Annual Total Return take into account the
effect of any sales charge on the amount available for investment or redemption;
quotations of Total Return will indicate whether or not the effect of the sales
charge is included. Income taxes are not taken into account. The figures will
not necessarily be indicative of future performance. The performance of a Fund
is a result of conditions in the securities markets, portfolio management, and
operating expenses. Although information such as yield and total return is
useful in reviewing a Fund's performance and in providing some basis for
comparison with other investment alternatives, it should not be used for
comparison with other investments using different reinvestment assumptions or
time periods.

         In advertising and sales literature, the performance of a Fund may be
compared with that of other mutual funds, indexes or averages of other mutual
funds, indexes of related financial assets or data, other accounts or
partnerships managed by Calamos Asset Management, Inc., and other

                                      B-42
<PAGE>   134

competing investment and deposit products available from or through other
financial institutions. The composition of these indexes, averages or accounts
differs from that of the Funds. Comparison of a Fund to an alternative
investment should consider differences in features and expected performance.

         All of the indexes and averages noted below will be obtained from the
indicated sources or reporting services, which the Funds generally believe to be
accurate. A Fund may also note its mention (including performance or other
comparative rankings) in newspapers, magazines, or other media from time to
time. However, the Funds assume no responsibility for the accuracy of such data.
Newspapers and magazines which might mention the Funds include, but are not
limited to, the following:


<TABLE>
<S>                                                           <C>
                 Barron's                                      Money
                 Business Week                                 Mutual Fund Letter
                 Changing Times                                Mutual Fund Magazine
                 Chicago Tribune                               Mutual Fund Values (Morningstar)
                 Chicago Sun-Times                             Newsweek
                 Crain's Chicago Business                      The New York Times
                 Consumer Reports                              Pensions and Investments
                 Consumer Digest                               Personal Investor
                 Financial World                               Smart Money
                 Forbes                                        Stanger Reports
                 Fortune                                       Time
                 Investor's Daily                              USA Today
                 Los Angeles Times                             U.S. News and World Report
                                                               The Wall Street Journal
</TABLE>



         Each Fund may compare its performance to the Consumer Price Index (All
Urban), a widely recognized measure of inflation.


         The performance of a Fund may be compared to various indexes or
averages, including but not limited to, CONVERTIBLE FUND AND CONVERTIBLE GROWTH
AND INCOME FUND - Standard & Poor's 500 Stock Index, Standard & Poor's 400
MidCap Index, Value Line Index, Lipper Balanced Fund Index, Lipper Convertible
Fund Index, Lipper Growth and Income Index, Lehman Brothers Government/Corporate
Index; MARKET NEUTRAL FUND - Lipper Long-Term Income Fund Index, Lehman Brothers
Corporate/Government Index, 30-day Treasury Bills; GROWTH FUND - Standard &
Poor's 500 Stock Index, Value Line Index, Lipper Growth Fund Average; GLOBAL
CONVERTIBLE FUND and GLOBAL CONVERTIBLE TECHNOLOGY FUND - Morgan Stanley Capital
International World Index; HIGH YIELD FUND - Lehman Brothers
Government/Corporate Bond Index, DLJ High Yield Index, Merrill Lynch High Yield
Master Index. The performance of a Fund may also be compared to the Russell 2000
Index, the Wilshire Small Growth Index, and the Fisher Small-Cap Growth Index,
all supplied by the Carmack Group. All three of these indexes represent equity
investments in smaller-capitalization stocks.


         The Lipper averages are unweighted averages of total return performance
of mutual funds as classified, calculated and published by Lipper Analytical
Services, Inc. ("Lipper"), an independent service that monitors the performance
of more than 1,000 funds. The Funds may also use comparative performance as
computed in a ranking by Lipper or category averages and rankings provided by
another independent service. Should Lipper or another service reclassify a Fund
to a different category or develop (and place a Fund into) a new category, that
Fund may compare its performance or ranking

                                      B-43
<PAGE>   135

against other funds in the newly assigned category, as published by the service.
Moreover, each Fund may compare its performance or ranking against all funds
tracked by Lipper or another independent service.

         To illustrate the historical returns on various types of financial
assets, the Portfolios may use historical data provided by Ibbotson Associates,
Inc. ("Ibbotson"), a Chicago-based investment firm. Ibbotson constructs (or
obtains) very long-term (since 1926) total return data (including, for example,
total return indexes, total return percentages, average annual total returns and
standard deviations of such returns) for common stocks, small company stocks,
long-term corporate bonds, long-term government bonds, intermediate-term
government bonds, U.S. Treasury bills and Consumer Price Index.


                                  DISTRIBUTOR


         Calamos Financial Services, Inc. ("CFS"), a broker-dealer whose sole
shareholder and principal officer is John P. Calamos, serves as distributor for
the Funds, subject to change by a majority of the "non-interested" trustees at
any time. CFS is located at 1111 East Warrenville Road, Naperville, Illinois
60563-1493. CFS is responsible for all purchases, sales, redemptions and other
transfers of shares of the Funds without any charge to the Funds except the fees
paid to CFS under the Distribution Plans. CFS is also responsible for all
expenses incurred in connection with its performance of services for the Funds,
including, but not limited to, personnel, office space and equipment, telephone,
postage and stationery expenses. CFS receives commissions from sales of shares
of the Funds that are not expenses of the Funds but represent sales commissions
added to the net asset value of shares purchased from the Funds. See "How to
Purchase Shares -- Offering Price" in the prospectus. CFS also receives
brokerage commissions for executing portfolio transactions for the Funds. See
"Portfolio Transactions." CFS received and retained commissions on the sale of
shares of the Funds (other than Global Convertible Technology Fund which is
expected to commence operations on or about August 1, 2000) as shown below
during the indicated periods:




<TABLE>
<CAPTION>
                                                      Year                  Year                      Year
                                                      Ended                 Ended                     Ended
                                                     3/31/00               3/31/99                   3/31/98
                                                   ----------             ---------              ------------
<S>                                                <C>                    <C>                    <C>
     Convertible Fund
              Commissions received                 $                      $231,244               $    282,787
              Commissions retained                                          50,628                     49,045

     Convertible Growth and Income Fund
              Commissions received                                          40,059                      9,268
              Commissions retained                                          12,310                      1,951
     Market Neutral Fund
              Commissions received                                           3,805                      1,071

</TABLE>


                                      B-44
<PAGE>   136

<TABLE>
<S>                                                        <C>                <C>                      <C>
              Commissions retained                                             776                         --
              Growth Fund
              Commissions received                                             972                      1,203
              Commissions retained                                             492                        756




Global Convertible Fund

              Commissions received                        1,860              1,490                         76
              Commissions retained                          188                250                         36



     High Yield Fund*

              Commissions received
              Commissions retained

         *   High Yield Fund commenced operation on August  , 1999.
</TABLE>



         CFS has the exclusive right to distribute shares of the Funds through
affiliated and unaffiliated dealers. The obligation of CFS is an agency or "best
efforts" arrangement, which does not obligate CFS to sell any stated number of
shares.

         In connection with the exchange privilege, CFS acts as a service
organization for the Money Market Portfolio, which is a portfolio of Cash
Account Trust. For its services it receives from the portfolios or their
affiliates fees at a rate of .60% of the average annual net assets of each
account in the portfolio established through the exchange plan.

         CFS from its own resources may pay additional compensation to persons
who sell Fund shares or provide subaccounting and shareholder servicing. Such
additional compensation may amount to as much as .25% of the offering price,
depending on the volume of sales or anticipated volume of sales attributable to
the recipient of the commission, and up to .10% of the annual average value of
shares held in such accounts.

                             PORTFOLIO TRANSACTIONS

         Portfolio transactions on behalf of the Funds effected on stock
exchanges involve the payment of negotiated brokerage commissions. There is
generally no stated commission in the case of securities traded in the
over-the-counter markets, but the price paid by the Funds usually includes an
undisclosed dealer commission or mark-up. In underwritten offerings, the price
paid by the Funds includes a disclosed, fixed commission or discount retained by
the underwriter or dealer.

         In executing portfolio transactions, the Adviser uses its best efforts
to obtain for the Funds the most favorable price and execution available. In
seeking the most favorable price and execution, the Adviser considers all
factors it deems relevant, including price, the size of the transaction, the
nature of

                                      B-45


<PAGE>   137

the market for the security, the amount of commission, the timing of the
transaction taking into account market prices and trends, the execution
capability of the broker-dealer and the quality of service rendered by the
broker-dealer in other transactions.

         The trustees have determined that portfolio transactions for the Funds
may be executed through CFS if, in the judgment of the Adviser, the use of CFS
is likely to result in prices and execution at least as favorable to the Funds
as those available from other qualified brokers and if, in such transactions,
CFS charges the Funds commission rates consistent with those charged by CFS to
comparable unaffiliated customers in similar transactions. The board of
trustees, including a majority of the trustees who are not "interested"
trustees, has adopted procedures that are reasonably designed to provide that
any commissions, fees or other remuneration paid to CFS are consistent with the
foregoing standard. The Funds will not effect principal transactions with CFS.

         Consistent with the Rules of Fair Practice of the National Association
of Securities Dealers, Inc. and subject to seeking the most favorable
combination of net price and execution available and such other policies as the
trustees may determine, the Adviser may consider sales of shares of a Fund as a
factor in the selection of broker-dealers to execute portfolio transactions for
that Fund.

         In allocating the Funds' portfolio brokerage transactions to
unaffiliated broker-dealers, the Adviser may take into consideration the
research, analytical, statistical and other information and services provided by
the broker-dealer, such as general economic reports and information, reports or
analyses of particular companies or industry groups, market timing and technical
information, and the availability of the brokerage firm's analysts for
consultation. Although the Adviser believes these services have substantial
value, they are considered supplemental to the Adviser's own efforts in the
performance of its duties under the management agreement. As permitted by
Section 28(e) of the Securities Exchange Act of 1934 ("1934 Act"), the Adviser
may pay a broker-dealer that provides brokerage and research services an amount
of commission for effecting a securities transaction for a Fund in excess of the
commission that another broker-dealer would have charged for effecting that
transaction if the amount is believed by the Adviser to be reasonable in
relation to the value of the overall quality of the brokerage and research
services provided. Other clients of the Adviser may indirectly benefit from the
availability of these services to the Adviser, and the Funds may indirectly
benefit from services available to the Adviser as a result of transactions for
other clients.


         The following table shows for each Fund (other than the Global
Convertible Technology Fund, which is expected to commence operations on or
about August 1, 2000) for the past three fiscal years: (i) the aggregate
principal amount of all portfolio transactions; (ii) the percentage of the
aggregate principal amount of all portfolio transactions executed by CFS as
agent; (iii) the aggregate principal amount of all transactions executed on an
agency basis, as to which the Fund paid brokerage commissions; (iv) the
percentage of the aggregate principal amount of such transactions executed
through CFS; (v) the aggregate brokerage commissions (excluding the gross
underwriting spread on securities purchased in underwritten public offerings)
paid to all brokers; (vi) the aggregate brokerage commissions paid to CFS; and
(vii) the percentage of aggregate brokerage commissions paid to CFS.



                                      B-46
<PAGE>   138


<TABLE>
<CAPTION>
                                     (i)        (ii)        (iii)       (iv)         (v)        (vi)        (vii)
                                              % of (i)               % of (iii)
                                   Amount     Executed     Amount     Executed               Commissions    (vi)
                                   of All      through    of Agency    through    Aggregate     Paid        as %
                                Transactions     CFS    Transactions     CFS     Commissions   to CFS      of (v)

<S>                             <C>           <C>       <C>          <C>         <C>         <C>           <C>
Convertible Fund
    Year ended 3/31/00
    Year ended 3/31/99
    Year ended 3/31/98

Convertible Growth and Income Fund

    Year ended 3/31/00
    Year ended 3/31/99
    Year ended 3/31/98

Market Neutral Fund

    Year ended 3/31/00
    Year ended 3/31/99
    Year ended 3/31/98
</TABLE>



                                      B-47
<PAGE>   139

Growth Fund
    Year ended 3/31/00
    Year ended 3/31/99
    Year ended 3/31/98

Global Convertible Fund
    Year ended 3/31/00
    Year ended 3/31/99
    Year ended 3/31/98

High Yield Fund
    Year ended 3/31/00*
* The High Yield fund commenced operations on August 1, 1999.

Of the aggregate brokerage commissions paid during the year ended March 31,
2000, Convertible Fund, Convertible Growth and Income Fund, Market Neutral Fund,
Growth Fund, Global Convertible Fund and High Yield Fund paid commissions of
$___, $___, $____, $____, $____ , and $____ respectively, to brokers who
furnished research services.



                                    TAXATION

         The following is only a summary of certain tax considerations affecting
the Funds and their shareholders. No attempt is made to present a detailed
explanation of the tax treatment of the Funds or their shareholders, and the
discussion here is not intended as a substitute for careful tax planning.
Investors are urged to consult their tax advisers with specific reference to
their own tax situations.

         At the time of your purchase, a Fund's net asset value may reflect
undistributed income, capital gains, or net unrealized appreciation of
securities held by that Fund. A subsequent distribution to you of such amounts,
although constituting a return of your investment, would be taxable either as a
dividend or capital gain distribution.

         Foreign currency gains and losses, including the portion of gain or
loss on the sale of debt securities attributable to foreign exchange rate
fluctuations, are taxable as ordinary income. If the net effect to a Fund of
those transactions is a gain, the income dividend paid by the Fund will be
increased; if the result is a loss, the income dividend paid will be decreased.



                                      B-48
<PAGE>   140
         Income received by a Fund from sources within various foreign countries
will be subject to foreign income taxes withheld at the source. Under the
Internal Revenue Code, if more than 50% of the value of a Fund's total assets at
the close of its taxable year comprises securities issued by foreign
corporations, the Fund may file an election with the Internal Revenue Service to
"pass through" to its shareholders the amount of foreign income taxes paid by
that fund. Pursuant to that election, shareholders would be required to: (i)
include in gross income, even though not actually received, their respective pro
rata share of foreign taxes paid by the fund; (ii) treat their pro rata share of
foreign taxes as paid by them; and (iii) either deduct their pro rata share of
foreign taxes in computing their taxable income, or use it as a foreign tax
credit against U.S. income taxes (but not both). No deduction for foreign taxes
may be claimed by a shareholder who does not itemize deductions.

QUALIFICATION AS A REGULATED INVESTMENT COMPANY


         The Global Convertible Technology Fund intends to qualify, and each
other Fund intends to continue to qualify, and elect to be treated as a
regulated investment company under Subchapter M of the Internal Revenue Code of
1986, as amended (the "Code") so as to be relieved of federal income tax on its
net investment income and capital gains that it currently distributes to
shareholders.


         The Funds must meet several requirements to maintain its status as a
regulated investment company. These requirements include the following: (1) at
least 90% of the Fund's gross income must be derived from dividends, interest,
payments with respect to securities loaned, and gains from the sale or
disposition of securities; and (2) at the close of each quarter of the Fund's
taxable year, (a) at least 50% of the value of the Fund's total assets must
consist of cash, U.S. Government securities and other securities (no more than
5% of the value of the Fund may consist of such other securities of any one
issuer, and the Fund must not hold more than 10% of the outstanding voting stock
of any issuer), and (b) the Fund must not invest more than 25% of the value of
its total assets in the securities of any one issuer (other than U.S. Government
securities).

         In order to maintain the qualification of the Fund's status as a
regulated investment company, the Trust may, in its business judgment, restrict
the Fund's ability to enter into stock index futures contracts or options on
such futures contracts or engage in short-term trading and transactions in
securities (including stock index futures contracts and options on such futures
contracts). For the same reason, the Trust may, in its business judgement,
require the Fund to defer the closing out of a contract beyond the time when it
might otherwise be advantageous to do so.


                             ALLOCATION AMONG FUNDS

         The assets received by the Trust from the sale of shares of each Fund,
and all income, earnings, profits and proceeds thereof, subject only to the
rights of creditors, are specifically allocated to that Fund, and constitute the
underlying assets of that Fund. The underlying assets of each Fund are required
to be segregated on the books of account, and are to be charged with the expense
in respect to that Fund and with a share of the general expenses of the Trust.
Any general expenses of the Trust not readily identifiable as belonging to a
particular Fund shall be allocated by or under the direction of the trustees in
such manner as the trustees determine to be fair and equitable. Each share of
each Fund represents an equal proportionate interest in that Fund with each
other share and is entitled to such dividends and distributions out of the
income belonging to that Fund as are declared by the trustees.

                                      B-49
<PAGE>   141


Upon any liquidation of a Fund, shareholders thereof are entitled to share pro
rata in the net assets belonging to that Fund available for distribution.


                              CERTAIN SHAREHOLDERS


     The only persons known to own beneficially (as determined in accordance
with rule 13d-3 under the 1934 Act) 5% or more of the outstanding shares of any
Fund at June 30, 2000 were:





<TABLE>
<CAPTION>

                                                                                            Percentage of
                                                                         Number of       Outstanding Shares
                    Shareholder                                           Shares            of the Funds
                    -----------                                           ------            ------------
<S>                                                                      <C>                <C>

         CONVERTIBLE FUND
         Merrill Lynch & Co., Inc.
         Global Headquarters
         World Financial Center
         North Tower
         250 Verey Street
         New York, NY 10281

         LaCross and Company
         311 Main Street
         P.O. Box 489
         LaCross, WI 54602-0489

         MARKET NEUTRAL FUND

         Charles Schwab & Co.
         Reinvest Account
         101 Montgomery St.
         San Francisco, CA 94104-4122

         Lincoln Trust Company
         Custodian Donald E. Lindley
         P.O. box 5831
         Denver, Colorado 80217-5831


         Prudential Securities FBO Marjorie K.
           Flannery, Trustee of Marjorie K.
           Flannery Revocable Trust dtd 3/28/84
           1365 Elmhurst Drive, N.E.
         Cedar Rapids, Iowa  52402-4771

</TABLE>



                                      B-50

<PAGE>   142



<TABLE>
<CAPTION>
                                                                                            Percentage of
                                                                         Number of       Outstanding Shares
                    Shareholder                                           Shares            of the Funds
                    -----------                                           ------            ------------
<S>                                                                      <C>                <C>

           Wexford Clearing Service CVRP FBO
           Paul Naffah
           6161 County Line Rd.
           Hinsdale, IL 60521-4868


         CONVERTIBLE GROWTH AND
         INCOME FUND

           John P. Calamos and Nick P. Calamos*
           1111 East Warrenville Road
           Naperville, Illinois  60563-1493

           Charles Schwab & Co.
           101 Montgomery St.
           San Francisco, CA 94104-4122


           Merril Lynch & Co., Inc.
           Global Headquarters
           World Financial Center
           North Tower
           250 Verey Street
           New York, New York 10281

           Calamos Financial Services, Inc.
           401(k) Profit Sharing Plan and Trust*
           1111 East Warrenville Road
           Naperville, Illinois 60563-1493


         GROWTH FUND

           John P. Calamos and Nick P. Calamos*
           1111 East Warrenville Road
           Naperville, Illinois  60563-1493

</TABLE>




                                      B-51
<PAGE>   143



<TABLE>
<CAPTION>

                                                                                            Percentage of
                                                                         Number of       Outstanding Shares
                    Shareholder                                           Shares            of the Funds
                    -----------                                           ------            ------------
<S>                                                                      <C>                <C>

           Calamos Financial Services, Inc.
           401(k) Profit Sharing Plan and Trust*
           1111 East Warrenville Road
           Naperville, Illinois 60563-1493

           Merril Lynch & Co., Inc.
           Global Headquarters
           World Financial Center
           North Tower
           250 Verey Street
           New York, NY 10281

           Calamos Financial Services, Inc.*
           1111 East Warrenville Road
           Naperville, Illinois  60563-1493

           GLOBAL CONVERTIBLE FUND

           John P. Calamos and Nick P. Calamos*
           1111 East Warrenville Road
           Naperville, Illinois 60563-1493

           Calamos Financial Services, Inc.
            401(k) Profit Sharing Plan and Trust*
           1111 East Warrenville Road
           Naperville, Illinois 60563-1493


         HIGH YIELD FUND
</TABLE>


         ------------------
         *   John P. Calamos and Nick P. Calamos are the trustees of the Calamos
         Financial Services, Inc. 401(k) Profit Sharing Plan and Trust and the
         Calamos Financial Services, Inc. 401(k) Employee Profit Sharing Plan
         and Trust. The shares owned beneficially by Messrs. John Calamos and
         Nick Calamos include the shares owned by the Calamos Financial
         Services, Inc. 401(k) Profit Sharing Plan and Trust and the Calamos
         Financial Services, Inc. 401(k) Employee Profit Sharing Plan and Trust.
         The shares shown as owned beneficially by

                                      B-52
<PAGE>   144


         Mr. John Calamos also include the shares shown as owned by Calamos
         Financial Services, Inc.


         At June 30, 2000 the trustees and officers of the Trust as a group
owned beneficially shares of the Funds as follows:          shares (   %) of
Convertible Fund;        shares (  %) of Convertible Growth and Income Fund;
shares (  %) of Market Neutral Fund;        shares (  %) of Growth Fund;
shares (  %) of Global Convertible Fund; and        shares (  %) of High Yield
Fund.


                                    CUSTODIAN

         The Bank of New York, 48 Wall Street, New York, New York 10286, is the
custodian for the assets of each Fund other than Market Neutral Fund, for whom
Prudential Securities, Inc., One New York Plaza, New York, New York 10292, is
the custodian. The custodian is responsible for holding all cash and securities
of the Funds, directly or through a book entry system, delivering and receiving
payment for securities sold by the Funds, receiving and paying for securities
purchased by the Funds, collecting income from investments of the Funds and
performing other duties, all as directed by authorized persons of the Trust. The
custodian does not exercise any supervisory functions in such matters as the
purchase and sale of securities by a Fund, payment of dividends or payment of
expenses of a Fund.



                              INDEPENDENT AUDITORS

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


                               GENERAL INFORMATION


         SHAREHOLDER INFORMATION


Each Fund is a series of Calamos Investment Trust (formerly named CFS Investment
Trust).  As of March 18, 1996 all shares of each Fund then outstanding were
re-designated as Class A shares of that Fund. Under the terms of the Agreement
and Declaration of Trust, the trustees may issue an unlimited number of shares
of beneficial interest without par value for each series of shares authorized by
the trustees and the trustees may divide the shares of any series into two or
more classes of shares of that series. Currently the Trust has seven series in
operation. All shares issued will be fully paid and non-assessable and will have
no preemptive or conversion rights. In the future, the board of trustees may
authorize the issuance of shares of additional series and additional classes of
shares of any series.

         Each Fund's shares of a given class are entitled to participate pro
rata in any dividends and other distributions declared by the Fund's board of
trustees with respect to shares of the Fund. All shares of the Fund of a given
class have equal rights in the event of liquidation of that class.



                                      B-53
<PAGE>   145


         Under Massachusetts law, the shareholders of the Trust may, under
certain circumstances, be held personally liable for the Trust's obligations.
However, the Trust's Declaration of Trust disclaims liability of the
shareholders, trustees, and officers of the Trust for acts or obligations of the
Funds, which are binding only on the assets and property of the Fund. The
Declaration of Trust requires that notice of such disclaimer be given in each
agreement, obligation, or contract entered into or executed by the Trust or the
board of trustees. The Declaration of Trust provides for indemnification out of
a Fund's assets of all losses and expenses of any Fund shareholder held
personally liable for the Fund's obligations. Thus, the risk of a shareholder
incurring financial loss on account of shareholder liability is remote, since it
is limited to circumstances in which the disclaimer is inoperative and the Fund
itself is unable to meet its obligations.

         VOTING RIGHTS

         Each share has one vote and fractional shares have fractional votes. As
a business trust, the Trust is not required to hold annual shareholder meetings.
However, special meetings may be called for purposes such as electing or
removing trustees, changing fundamental policies or approving an investment
advisory agreement.

FINANCIAL STATEMENTS


Audited financial statements for the Trust for the fiscal year ended March 31,
2000 are incorporated herein by reference from the Calamos Investment Trust's
annual report to shareholders.



                                      B-54

<PAGE>   146


                      APPENDIX--DESCRIPTION OF BOND RATINGS


         A rating of a rating service represents the service's opinion as to the
credit quality of the security being rated. However, the ratings are general and
are not absolute standards of quality or guarantees as to the creditworthiness
of an issuer. Consequently, the Portfolio's investment manager believes that the
quality of debt securities in which the Portfolio invests should be continuously
reviewed. A rating is not a recommendation to purchase, sell or hold a security,
because it does not take into account market value or suitability for a
particular investor. When a security has received a rating from more than one
service, each rating should be evaluated independently. Ratings are based on
current information furnished by the issuer or obtained by the ratings services
from other sources which they consider reliable. Ratings may be changed,
suspended or withdrawn as a result of changes in or unavailability of such
information, or for other reasons.

         The following is a description of the characteristics of ratings used
by Moody's Investors Service, Inc. ("Moody's") and Standard & Poor's Corporation
("S&P").

MOODY'S RATINGS

         AAA--Bonds rated Aaa are judged to be the best quality. They carry the
smallest degree of investment risk and are generally referred to as "gilt-edge."
Interest payments are protected by a large or by an exceptionally stable margin
and principal is secure. Although the various protective elements are likely to
change, such changes as can be visualized are most unlikely to impair the
fundamentally strong position of such bonds.

         AA--Bonds rated Aa are judged to be high quality by all standards.
Together with the Aaa group they comprise what are generally known as high grade
bonds. They are rated lower than the best bonds because margins of protection
may not be as large as in Aaa bonds or fluctuation of protective elements may be
of greater amplitude or there may be other elements present which make the long
term risk appear somewhat larger than in Aaa bonds.

         A--Bonds rated A possess many favorable investment attributes and are
to be considered as upper medium-grade obligations. Factors giving security to
principal and interest are considered adequate, but elements may be present
which suggest a susceptibility to impairment sometime in the future.

         BAA--Bonds rated Baa are considered as medium-grade obligations, i.e.,
they are neither highly protected nor poorly secured. Interest payments and
principal security appear adequate for the present, but certain protective
elements may be lacking or may be characteristically unreliable over any great
length of time. Such bonds lack outstanding investment characteristics and in
fact have speculative characteristics as well.

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


                                      B-55
<PAGE>   147

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

         CAA--Bonds rated Caa are of poor standing. Such bonds may be in default
or there may be present elements of danger with respect to principal or
interest.

         CA--Bonds rated Ca represent obligations which are speculative in a
high degree. Such bonds are often in default or have other marked shortcomings.

S&P RATINGS

         AAA--Bonds rated AAA have the highest rating. Capacity to pay principal
and interest is extremely strong.

         AA--Bonds rated AA have a very strong capacity to pay principal and
interest and differ from AAA bonds only in small degree.

         A--Bonds rated A have a strong capacity to pay principal and interest,
although they are somewhat more susceptible to the adverse effects of changes in
circumstances and economic conditions than bonds in higher rated categories.

         BBB--Bonds rated BBB are regarded as having an adequate capacity to pay
principal and interest. Whereas they normally exhibit protection parameters,
adverse economic conditions or changing circumstances are more likely to lead to
a weakened capacity to pay principal and interest for bonds in this capacity
than for bonds in higher rated categories.

         BB--B--CCC--CC--Bonds rated BB, B, CCC and CC are regarded, on balance,
as predominantly speculative with respect to the issuer's capacity to pay
interest and repay principal in accordance with the terms of the obligation. BB
indicates the lowest degree of speculation among such bonds and CC the highest
degree of speculation. Although such bonds will likely have some quality and
protective characteristics, these are outweighed by large uncertainties or major
risk exposures to adverse conditions.


                                      B-56

<PAGE>   148

                            PART C OTHER INFORMATION


ITEM 23        Exhibits

     (a)(1)    Amended and Restated Agreement and Declaration of Trust (exhibit
               1 to Post-Effective Amendment No. 18*)

     (a)(2)    Amendment to Declaration of Trust (exhibit (a)(2) to Post-
               Effective Amendment No. 21*)

     (a)(3)    Amendment to Declaration of Trust**

     (b)       Bylaws, as amended through March 25, 1997 (exhibit 2 to Post-
               effective Amendment no. 18*)

     (c)       See Articles IV and V of Exhibit (a)(1), above.

     (d)(1)    Management agreement with Calamos Asset Management, Inc. dated
               July 5, 1988 - Calamos Growth and Income Fund (exhibit 5.1 to
               Post-effective Amendment no. 18*)

     (d)(2)    Notification dated August 22, 1990 pursuant to section 1(b) of
               management agreement for series designated Calamos Strategic
               Income Fund and Calamos Growth Fund (exhibit 5.2 to Post-
               effective Amendment no. 18*)

     (d)(3)    Notification dated April 30, 1992 pursuant to section 1(b) of
               management agreement for series designated Calamos Convertible
               Fund (exhibit 5.3 to Post-effective Amendment no. 18*)

     (d)(4)    Form of notification pursuant to section 1(b) of management
               agreement for series designated Calamos Global Growth and Income
               Fund (exhibit 5.4 to Post-effective Amendment no. 13*)

     (d)(5)    Form of notification pursuant to section 1(b) of management
               agreement for series designated Calamos High Yield Fund

     (d)(6)    Form of management agreement dated August 1, 2000**

     (e)(1)    Form of distribution agreement with Calamos Financial Services,
               Inc. dated June 19, 1996 (exhibit 6.1 to Post-effective Amendment
               no. 13*)

     (e)(2)    Form of selling group agreement, revised 1996 (exhibit 6.2 to
               Post-effective Amendment no. 13*)

     (f)       None

     (g)(1)    Custody agreement (for all series except Calamos Market Neutral
               Fund) with Bank of New York dated October 16, 1997 (exhibit 8.1
               to Post-effective Amendment no. 19*)

     (g)(2)    First amendment to custody agreement with Bank of New York dated
               October 16, 1998 (exhibit 8.2 to Post-effective Amendment no.
               19*)

     (g)(3)    Form of custody agreement (for all series except Market Neutral
               Fund) with Firstar Bank dated ____, 2000**

     (g)(4)    Custody agreement (for Calamos Market Neutral Fund) with
               Prudential-Bache Securities, Inc. dated April 20, 1990 (exhibit 8
               to Post-effective Amendment no. 18*)

     (h)(1)    Investment company services agreement with First Data Investor
               Services Group, Inc. dated October 1, 1998 (exhibit 9.1 to Post-
               effective Amendment no. 19*)

     (h)(2)    Form of transfer agency agreement with Firstar**

     (h)(3)    Form of fund accounting agreement with Firstar**

     (h)(4)    Use of name agreement dated August 23, 1990 (exhibit 9.5 to
               Post-effective Amendment no. 18*)


<PAGE>   149



     (i)(1)    Opinion and Consent of Bell, Boyd & Lloyd dated ____, 2000**

     (i)(2)    Opinion and Consent of Goodwin, Procter & Hoar dated April 2,
               1996 (exhibit 10 to Post-effective Amendment No. 13*)

     (i)(3)    Opinion and Consent of Bell, Boyd, & Lloyd dated June 19, 1997
               (exhibit 10.2 to Post-effective Amendment No. 18*)

     (j)       Consent of independent auditors**

     (k)       None

     (l)       Subscription agreement - Calamos Global Convertible Technology
               Fund **

     (m)       Amended and restated distribution plan dated March 16, 2000

     (n)       Financial Data Schedule**

     (o)(1)    Rule 18f-3 Plan dated March 17, 1999 (exhibit (o) to Post-
               Effective Amendment no. 21*)

     (o)(2)    Rule 18f-3 Plan dated August 1, 2000**

     (p)       Code of Ethics

* Incorporated herein by reference.
**To be filed by amendment

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


               The information in the prospectus under the captions "Who Manages
the Funds?", and in the Statement of Additional Information under the caption
"Management" and "Certain Shareholders" is incorporated by reference.

ITEM 25.  INDEMNIFICATION

               Article VI of the agreement and declaration of trust of
registrant (exhibit (a) to this registration statement which is incorporated
herein by reference) provides that the Trust shall indemnify (from the assets of
the Sub-Trust or Sub-Trusts in question) each of its Trustees and officers
(including persons who serve at the Trust's request as directors, officers or
trustees of another organization in which the trust has any interest as a
shareholder, creditor or otherwise [hereinafter referred to as a "Covered
Person"] against all liabilities, including but not limited to amounts paid in
satisfaction of judgments, in compromise or as fines and penalties, and
expenses, including reasonable accountants' and counsel fees, incurred by any
Covered Person in connection with the defense or disposition of any action, suit
or other proceeding, whether civil or criminal, before any court or
administrative or legislative body, in which such Covered Person may be or may
have been involved as a party or otherwise or with which such person may be or
may have been threatened, while in office or thereafter, by reason of being or
having been such a Trustee or officer, director or trustee, except with respect
to any matter as to which it has been determined in one of the manners described
below, that such covered Person (i) did not act in good faith in the reasonable
belief that such Covered Person's action was in or not opposed to the best
interests of the Trust or (ii) had acted with willful misfeasance, bad faith,
gross negligence or reckless disregard of the duties involved in the conduct of
such Covered Person's office (either and both of the conduct described in (i)
and (ii) being referred to hereafter as "Disabling Conduct").


               A determination that the Covered Person is not entitled to
indemnification due to Disabling conduct may be made by (i) a final decision on
the merits by a court or other body before whom the proceeding was brought that
the person to be indemnified was not liable by reason of Disabling Conduct, (ii)
dismissal of a court action or an administrative proceeding against a Covered
Person for insufficiency of evidence of Disabling Conduct, or (iii) a reasonable
determination, based upon a review of the facts, that the indemnitee was not
liable by reason of Disabling Conduct by (a) a vote of a majority of a quorum of
Trustees who are neither "interested persons" of the Trust as defined in section
2(a)(19) of the Investment Company Act of 1940 nor parties to the proceeding, or
(b) an independent legal counsel in a written opinion. Expenses, including
accountants' and counsel fees so incurred by any such Covered Person (but
excluding amounts paid in satisfaction of judgments, in compromise or as fines
or penalties), may be paid from time to time in advance of the final


<PAGE>   150


disposition of any such action, suit or proceeding, provided that the Covered
Person shall have undertaken to repay the amounts so paid to the Sub-Trust in
question if it is ultimately determined that indemnification of such expenses is
not authorized under this Article VI and (i) the Covered Person shall have
provided security for such undertaking, (ii) the Trust shall be insured against
losses arising by reason of any lawful advances, or (iii) a majority of a quorum
of the disinterested Trustees who are not a party to the proceeding, or an
independent legal counsel in a written opinion, shall have determined, based on
a review of readily available facts (as opposed to a full trial-type inquiry),
that there is reason to believe that the Covered Party ultimately will be found
entitled to indemnification.


               Insofar as indemnification for liabilities 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.

<PAGE>   151


ITEM 26.  BUSINESS AND OTHER CONNECTIONS OF INVESTMENT ADVISER

               The information in the statement of additional information under
the caption "Management - Trustees and Officers" is incorporated by reference.

ITEM 27.  PRINCIPAL UNDERWRITERS

     (a)  Calamos Financial Services, Inc. ("CFS") serves as principal
          underwriter for the Calamos Investment Trust and the Calamos Advisors
          Trust.

     (b)  Information on the officers and directors of CFS is set forth below.
          The principal business address is 1111 East Warrenville Road,
          Naperville, Illinois 60563.


<TABLE>
<CAPTION>
    Name                       Positions and Offices              Positions and Offices
    ----                       with Underwriter                   with Registrant
                               ----------------                   ---------------
<S>                            <C>                                <C>
John P. Calamos                Director, President                President
Nick P. Calamos                Vice President                     Vice President
John P. Calamos, Jr.           Vice President                     None
Joseph Lopykinski              Treasurer                          None
James S. Hamman, Jr.           Secretary                          Secretary
</TABLE>



ITEM 28.  LOCATION OF ACCOUNTS AND RECORDS

               All such accounts, books and other documents are maintained at
the offices of the Registrant, at the offices of the Registrant's investment
manager, Calamos Asset Management, Inc., and Calamos Financial Services, Inc.,
the Registrant's principal underwriter, 1111 East Warrenville Road, Naperville,
Illinois 60563, at the offices of the custodians, Bank of New York, 90
Washington Street, New York, NY 10286, and Prudential Securities, One New York
Plaza, New York, NY 10292, or at the offices of the transfer agent, First Data
Investor Services Group, Inc., 3200 Horizon Drive, King of Prussia, PA 19406.

ITEM 29.  MANAGEMENT SERVICES

               None

ITEM 30.  UNDERTAKINGS

               None


<PAGE>   152

                                   SIGNATURES



Pursuant to the requirements of the Securities Act of 1933 and the Investment
Company Act of 1940, the registrant certifies that it has duly caused this
registration statement to be signed on its behalf by the undersigned, thereunto
duly authorized, in Naperville, Illinois on June 1, 2000.



                                      CALAMOS INVESTMENT TRUST



                                      By /s/ John P. Calamos
                                        --------------------------------
                                             John P. Calamos




Pursuant to the requirements of the Securities Act of 1933, this amendment to
the registration statement has been signed below on June 1, 2000, on behalf of
the following persons in the capacities indicated.




      Name                                Title
      ----                                -----

/s/ John P. Calamos                 Trustee and President (principal
    John P. Calamos                 executive officer)

/s/ Nick P. Calamos                 Trustee
    Nick P. Calamos

    Richard J. Dowen*               Trustee
    Richard J. Dowen

    Robert Frost*                   Trustee
    Robert Frost

    William Kaun*                   Trustee
    William Kaun



*James S. Hamman, Jr. signs this document pursuant to powers of attorney.



                                              /s/ James S. Hamman, Jr.
                                             --------------------------------
                                                  James S. Hamman, Jr.







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