Prospectus by Investment Company (Form 497)

CALVERT HIGH YIELD BOND fUND

(the "Fund")

Supplement to Summary Prospectus, Statutory Prospectus
and Statement of Additional Information ("SAI") dated February 1, 2026

as may be supplemented and/or revised from time to time

Effective December 31, 2026 (the "Effective Date"), Stephen C. Concannon, CFA intends to retire and will no longer serve as a portfolio manager of the Fund. Accordingly, on the Effective Date, all references to Mr. Concannon will be removed from the Fund's Summary Prospectus, Statutory Prospectus and SAI.

Justin H. Bourgette, CFA and Bo Hunt will continue to serve as portfolio managers of the Fund.