Company: CHY
Filing Date: 2025-02-21
Form Type: N-2ASR
Source: 0001104659-25-016081
Chunk: 176

Company: CALAMOS CONVERTIBLE & HIGH INCOME FUND
Filing Date: 2025-02-21
Form: N-2ASR
Chunk 176
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| Proceeds to us (before expenses)(1) |     | $         | [] |     | $     | [] |

(1) Does not include offering expenses payable to us estimated to be $[]. The underwriters expect to deliver the Series Preferred Shares in book-entry form, through the facilities of The Depository Trust Company, to broker-dealers on or about [], 20[]. [UNDERWRITER(S)] [], 20[] This prospectus supplement has been filed with the Securities and Exchange Commission (the “Commission”). Additional copies of this prospectus supplement, the prospectus, the statement of additional information dated, as supplemented from time to time, or the Fund’s annual or semi-annual reports are available by calling (800) 582-6959 or by writing to the Fund, or you may obtain copies (and other information regarding us) from the SEC’s website (http://www.sec.gov). The Fund’s annual and semi-annual reports are also available on the Fund’s website at www.calamos.com, which provides a link to the Commission’s website where the Fund’s statement of additional information may be obtained. This prospectus supplement, which describes the specific terms of this offering, also adds to and updates information contained in the accompanying prospectus and the documents incorporated by reference in the prospectus. The prospectus gives more general information, some of which may not apply to this offering. If the description of this offering varies between this prospectus supplement and the accompanying prospectus, you should rely on the information contained in this prospectus supplement; provided that if any statement in one of these documents is inconsistent with a statement in another document having a later date, the statement in the document having the later date modifies or supersedes the earlier statement. The Preferred Shares do not represent a deposit or obligation of, and are not guaranteed or endorsed by, any bank or other insured depository institution, and are not federally insured by the Federal Deposit Insurance Corporation, the Federal Reserve Board or any other government agency. TABLE OF CONTENTS Prospectus Supplement

|                                                 | Page   |
| Prospectus Supplement Summary                   | PREF-1 |
| Use of Proceeds                                 | PREF-3 |
| Capitalization                                  | PREF-3 |
| Asset Coverage Requirements                     | PREF-3 |
| Description of Preferred Shares                 | PREF-4 |
| Underwriting                                    | PREF-7 |
| Where You Can Find More Information             | PREF-7 |
| Legal Matters                                   | PREF-7 |
| [Unaudited] Financial Statements