Company: CHY
Filing Date: 2025-08-29
Form Type: 424B3
Source: 0001104659-25-085285
Chunk: 1

Company: CALAMOS CONVERTIBLE & HIGH INCOME FUND
Filing Date: 2025-08-29
Form: 424B3
Chunk 1
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 CEO of MacKay Shields (2011-2024); EVP and Chief Investment Officer AllianceBernstein (1988-2011); former Senior member of the Management and M&A Committees of New York Life Investment Management, LLC (2018-Q1/2024); Chairman of the Plainview Funds (Irish QIAF) Board of Directors (2013-Q1/2024); Advisory Committee Member – Brewer Lane Ventures Fund I & II (2020-Present)                                                                                                                                  |     | More than 25 years of experience in the financial services industry; experience serving on boards of other entities, including other investment companies; and earned a Masters of Business Administration degree |

^ The Fund Complex consists of Calamos Investment Trust, Calamos Advisors Trust, 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, Calamos ETF Trust, Calamos Antetokounmpo Sustainable Equities Trust, Calamos Aksia Alternative Credit and Income Fund, and Calamos Aksia Private Equity and Alternatives Fund.

| (4) | Effective September 1, 2025, the                                                       
 section titled “Committees of the Board of Trustees” under the “Management             
 of the Fund” section beginning on page S-32 of the Statement of Additional Information 
 is amended to reflect the following information:                                       |

Mr. Armstrong and Mr. Phlegar will each serve on the Trust’s Audit Committee, Governance Committee and Valuation Committee

| (5) | Effective September 1, 2025 the                                                    
 section titled “Leadership Structure and Qualifications of the Board of Trustees”  
 under the “Management of the Fund” section beginning on page S-35 of the Statement 
 of Additional Information is amended and restated as follows:                      |

LEADERSHIP STRUCTURE AND QUALIFICATIONS OF THE BOARD OF TRUSTEES.The board of trustees is responsible for oversight of the Fund. The Fund has engaged Calamos Advisors to manage the Funds on a day-to-day basis. The board of trustees oversees Calamos Advisors and certain other principal service providers in the operations of their respective Funds. The board of trustees is composed of ten members, eight of whom will be non-interested trustees. The board of trustees meets in-person at regularly scheduled meetings four times throughout the year. In addition