CALAMOS INVESTMENT TRUST/IL
497, 2000-09-11
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<PAGE>   1

                           CALAMOS(R) FAMILY OF FUNDS
                          ---------------------------
     SUPPLEMENT DATED SEPTEMBER 11, 2000 TO PROSPECTUS DATED AUGUST 1, 2000

TELEPHONE PURCHASES PERMITTED
Once you have established an account, you may purchase shares over the telephone
by debiting your bank account. To electronically debit your bank account, you
must hold your account at a financial institution that is an Automatic Clearing
House member. To permit telephone purchases, you must authorize telephone
purchases on your account application. Call us at 800.823.7386 to obtain an
account application with the telephone purchase option. If you did not authorize
telephone purchases on your original account application, you may request
telephone purchases by submitting a request in writing along with a voided
check, to Firstar Mutual Fund Services, LLC, 615 E. Michigan Street, Milwaukee,
WI 53202.

To purchase shares by telephone, call 800.823.7386. The purchase price for the
shares will be the net asset value per share next computed after receipt by our
transfer agent of your telephone purchase if you call to place your order by
3:00 p.m. Central time. We will initiate most electronic transfers from your
bank account to pay for the share purchase within that same business day.

We may modify or terminate the ability to purchase shares by telephone at any
time, or from time to time, without notice to shareholders. If your order to
purchase shares of a Fund is canceled because your electronic transfer does not
clear, you will be responsible for any resulting loss incurred by the Fund. We,
and our transfer agent, will be liable for losses resulting from unauthorized
telephone purchases only if we do not follow reasonable procedures designed to
verify the identity of the caller. You should immediately verify your trade
confirmations when you receive them.

SHAREHOLDER FEES
Effective September 11, 2000, a service charge of $12 is deducted from proceeds
of redemption paid by wire.

VOLUNTARY FEE WAIVER FOR CLASS A SHARES OF EACH FUND
Effective April 1, 2000, CALAMOS(R) Asset Management, Inc. voluntarily agreed to
waive fees and/or expenses until August 31, 2001, so that the total annual
operating expenses of Class A shares of each Fund are limited to 1.75%. The
following operating expense table for Class A shares of Market Neutral Fund,
Growth Fund, Global Convertible Fund, High Yield Fund and Convertible Technology
Fund replaces the expense tables for Class A shares of each Fund on pages 30,
36, 46, 53 and 61 of the prospectus:

<TABLE>
<CAPTION>
                                                  Market               Global      High    Convertible
                                                  Neutral   Growth   Convertible   Yield   Technology
                                                   Fund      Fund       Fund       Fund       Fund
                                                  -------   ------   -----------   -----   -----------
<S>                                               <C>       <C>      <C>           <C>     <C>
ANNUAL FUND OPERATING EXPENSES
(EXPENSES DEDUCTED FROM FUND ASSETS)
------------------------------------------------------------------------------------------------------
  Management Fees                                   .75%     1.00%      1.00%       .75%      1.00%
------------------------------------------------------------------------------------------------------
  Distribution (12b-1) Fees*                        .25%      .25%       .25%       .25%       .25%
------------------------------------------------------------------------------------------------------
  Other Expenses**                                 2.25%      .53%      1.70%      11.85%     1.70%
------------------------------------------------------------------------------------------------------
  Total Annual Operating Expenses***               3.25%     1.78%      2.95%      12.85%     2.95%
------------------------------------------------------------------------------------------------------
  Fee Waiver and/or Expense Reimbursement          1.50%      .03%      1.20%      11.10%     1.20%
------------------------------------------------------------------------------------------------------
  Net Expenses                                     1.75%     1.75%      1.75%      1.75%      1.75%
------------------------------------------------------------------------------------------------------
</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.
<PAGE>   2

**  "Other Expenses" for the Convertible Technology Fund are based on estimated
    amounts for the current fiscal year. The Fund is expected to commence
    operations on or about September 11, 2000.
*** 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 1.75% for Class A shares. Pursuant to a written agreement,
    the fee waiver and/or reimbursement is binding on CAM through August 31,
    2001.

The following examples for Class A shares of Market Neutral Fund, Growth Fund,
Global Convertible Fund, High Yield Fund and Convertible Technology Fund replace
the examples shown on pages 31, 37, 47, 54 and 62 of the prospectus:

     EXAMPLES (CLASS A SHARES ONLY):
     These examples are intended to help you compare the cost of investing in
     Class A shares of each 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 Convertible Technology Fund, which shows
     one year and three years only. In each case, we assume that you invest
     $10,000 in Class A shares of 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, except for waivers in the first
     year. Although your actual costs may be higher or lower, based on these
     assumptions your costs would be:

<TABLE>
<CAPTION>
                                                                      Global                            Convertible
                             Market Neutral Fund   Growth Fund   Convertible Fund   High Yield Fund   Technology Fund
      ---------------------------------------------------------------------------------------------------------------
      <S>                    <C>                   <C>           <C>                <C>               <C>
        One Year                   $  644            $  644           $  644            $  644            $  644
      ---------------------------------------------------------------------------------------------------------------
        Three Years                $1,295            $1,000           $1,237            $2,977            $1,237
      ---------------------------------------------------------------------------------------------------------------
        Five Years                 $1,968            $1,379           $1,853            $4,958                --
      ---------------------------------------------------------------------------------------------------------------
        Ten Years                  $3,758            $2,439           $3,509            $8,700                --
      ---------------------------------------------------------------------------------------------------------------
</TABLE>

PROSPECTUSES AND SHAREHOLDER REPORTS
We reduce the number of duplicate prospectuses and annual and semi-annual
reports you receive by sending only one copy of each to those addresses shared
by two or more accounts. Call us at 800.823.7386 or write to us at The Calamos
Family of Funds, c/o Firstar Mutual Fund Services, LLC, 615 E. Michigan Street,
Milwaukee, WI 53202 to request individual copies of these documents. We will
begin sending you individual copies within thirty days of your request.

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