Company: CHY
Filing Date: 2025-08-29
Form Type: 424B3
Source: 0001104659-25-085285
Chunk: 5

Company: CALAMOS CONVERTIBLE & HIGH INCOME FUND
Filing Date: 2025-08-29
Form: 424B3
Chunk 5
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500 for any special
board meeting attended by telephone.

Compensation paid to the non-interested trustees is allocated among
the series of the Calamos Funds in accordance with a procedure determined from time to time by the board.

The Fund has adopted a deferred compensation plan for non-interested trustees (the “Plan”). Under the Plan, a trustee who is not an “interested person” of Calamos and has elected to participate in the Plan (“a participating trustee”) may defer receipt of all or a portion of his or her compensation from the Fund in order to defer payment of income taxes or for other reasons. The deferred compensation payable to the participating trustee is credited to the trustee’s deferred compensation account as of the business day such compensation otherwise would have been paid to the trustee. The value of a trustee’s deferred compensation account at any time is equal to what the value would be if the amounts credited to the account had instead been invested in shares of one or more of the funds as designated by the trustee. Thus, the value of the account increases with contributions to the account or with increases in the value of the measuring shares, and the value of the account decreases with withdrawals from the account or with declines in the value of the measuring shares. If a participating trustee retires, the trustee may elect to receive payments under the plan in a lump sum or in equal annual installments over a period of five years. If a participating trustee dies, any amount payable under the Plan will be paid to the trustee’s beneficiaries. Each Calamos Fund’s obligation to make payments under the Plan is a general obligation of that Fund. No Fund is liable for any other Fund’s obligations to make payments under the Plan.

| (7) | Effective September 1, 2025, the                                               
 section titled “Ownership of Shares of the Fund and Other Calamos Funds” under 
 the “Management of the Fund” section beginning on page S-37 of the Statement   
 of Additional Information is amended and restated as follows:                  |

OWNERSHIP SHARES OF THE FUND AND OTHER CALAMOS FUNDS. The following table indicates the value of shares that each Trustee beneficially owns in the Fund and the Calamos Fund Complex in the aggregate. The value of shares of the Calamos Funds is determined on the basis of the net asset value of the class of shares held as of March 31, 2025. The value of the shares held, are stated in ranges in accordance with the requirements of the SEC. The table reflects the Trustee’s beneficial