Company: CHY
Filing Date: 2025-05-12
Form Type: DEF 14A
Source: 0001104659-25-047185
Chunk: 0

Company: CALAMOS CONVERTIBLE & HIGH INCOME FUND
Filing Date: 2025-05-12
Form: DEF 14A
Chunk 0
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UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box:

| ☐ | Preliminary Proxy Statement                                                     |
| ☐ | Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) |
| ☒ | Definitive Proxy Statement                                                      |
| ☐ | Definitive Additional Materials                                                 |
| ☐ | Soliciting Material Pursuant to §240.14a-12                                     |

CALAMOS CONVERTIBLE OPPORTUNITIES AND INCOME FUND CALAMOS CONVERTIBLE AND HIGH INCOME FUND CALAMOS STRATEGIC TOTAL RETURN FUND CALAMOS GLOBAL TOTAL RETURN FUND CALAMOS GLOBAL DYNAMIC INCOME FUND CALAMOS DYNAMIC CONVERTIBLE AND INCOME FUND CALAMOS LONG/SHORT EQUITY & DYNAMIC INCOME TRUST (Name of Registrant as Specified In Its Charter) (Name of Person(s) Filing Proxy Statement, if other than the Registrant)

| Payment of Filing Fee (Check the appropriate box): |                                                                                                    |
| ☒                                                  | No fee required.                                                                                   |
| ☐                                                  | Fee paid previously with preliminary materials.                                                    |
| ☐                                                  | Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a6(i)(1) and 0-11 |

<div align='center'>CALAMOS ®CONVERTIBLE OPPORTUNITIES AND INCOME FUND

CALAMOS ®CONVERTIBLE AND HIGH INCOME FUND

CALAMOS ®STRATEGIC TOTAL RETURN FUND

CALAMOS ®GLOBAL TOTAL RETURN FUND

CALAMOS ®GLOBAL DYNAMIC INCOME FUND

CALAMOS ®DYNAMIC CONVERTIBLE AND INCOME FUND

CALAMOS ®LONG/SHORT EQUITY & DYNAMIC INCOME TRUST

2020 Calamos Court
Naperville, Illinois 60563-2787
1-800-582-6959</div>

May 13, 2025

Dear Shareholder:

You are cordially invited to attend the joint annual meeting of shareholders of each of the funds named above (each, a "Fund"), which will be