The following is added as footnote 2 with respect to the “Management Fee” row in the Annual Fund Operating Expenses table for Calamos International Growth Fund (on page 71 of the Prospectus):

“The Fund’s management fee is determined by calculating a base fee and applying a performance adjustment. The Fund's base fee is at the annual rate of 1.00% on the first $500 million, 0.95% on the next $500 million, 0.90% on the next $5 billion (over $1 billion to $6 billion), and 0.80% on average daily net assets in excess of $6 billion. The base fee is subject to adjustment, up or down, based on the Fund's performance relative to the performance of the MSCI EAFE Growth Index. Specifically, the performance adjustment equally increases or decreases the base fee, on a monthly basis, by 1/12 of 0.03% of the Fund's average daily net assets over the performance measurement period for each full 1% increment amount by which the Fund outperforms or underperforms the MSCI EAFE Growth Index over the performance measurement period on an annualized basis. The maximum monthly performance adjustment for each Fund is plus or minus 1/12 of 0.30% of the Fund's average daily net assets during the performance measurement period.”