Effective December 16, 2019, the last paragraph in the section titled Officers on page S-29 of the Statement of Additional Information is hereby deleted and replaced with the following:
The Funds Board of Trustees consists of nine members. In accordance with the Funds Agreement and Declaration of Trust, the Board
of Trustees is divided into three classes of approximately equal size. The terms of the trustees of the different classes are staggered. The terms of John P. Calamos, Sr., William R. Rybak, Karen L. Stuckey, and Christopher M. Toub will expire at
the annual meeting of shareholders in 2020. The terms of John E. Neal and David D. Tripple will expire at the annual meeting of shareholders in 2021. The terms of Virginia G. Breen, Stephen B. Timbers and Lloyd A. Wennlund will expire at the annual
meeting of shareholders in 2022. Such classification of the Trustees may prevent the replacement of a majority of the Trustees for up to a two-year period. Each of the Funds officers serves until his or
her successor is chosen and qualified or until his or her resignation or removal by the Board of Trustees. Mr. Rybak and Ms. Breen are the Trustees who represent the holders of preferred shares of the Fund.
Effective December 16, 2019, the section titled Committees of the Board of Trustees beginning on page
S-29 of the Statement of Additional Information is amended to reflect the following information:
Ms. Stuckey and Mr. Toub each serve on the audit committee, valuation committee, and governance committee.
Effective December 16, 2019, the section titled Leadership Structure and Qualifications of the Board of Trustees beginning on page S-31 of the Statement of Additional Information is deleted and replaced with the following:
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 to manage the Fund on a day-to-day basis. The Board of Trustees oversees Calamos and certain other principal service providers in the operations
of the Fund. The Board of Trustees is currently composed of nine members, eight of whom are non-interested trustees. The Board of Trustees meets in-person at regularly
scheduled meetings four times throughout the year. In addition, the Board may meet in-person or by telephone at special meetings or on an informal basis at other times. As described above, the Board of
Trustees has established five standing committees Audit, Dividend, Executive, Governance and Valuation and may establish ad hoc committees or working groups from time to time, to assist the Board of Trustees in fulfilling its oversight
responsibilities. The non-interested trustees also have engaged independent legal counsel to assist them in fulfilling their responsibilities. Such independent legal counsel also serves as counsel to the Fund.
The chairman of the Board of Trustees is an interested person of the Fund (as such term is defined in the 1940 Act). The non-interested trustees have appointed a lead independent trustee. The lead independent trustee serves as a liaison between Calamos and the non-interested trustees and leads
the non-interested trustees in all aspects of their oversight of the Fund. Among other things, the lead independent trustee reviews and approves, with the chairman, the agenda for each board and committee
meeting and facilitates communication among the Funds non-interested trustees. The Trustees believe that the Boards leadership structure is appropriate given the characteristics and circumstances
of the Fund. The Trustees also believe that this structure facilitates the exercise of the Boards independent judgment in fulfilling its oversight function and efficiently allocates responsibility among committees.
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