Jon A. Vacko

Calamos Advisors LLC is a registered investment advisor headquartered in Naperville, Illinois. The firm was founded by John Calamos, Sr. in 1977 and is a wholly-owned subsidiary of Calamos Investments LLC, ultimately held by Calamos Family Partners, Inc. Calamos Advisors provides investment management services to institutional clients such as corporations and financial institutions, registered investment companies or mutual funds, closed-end funds, charitable institutions, foundations and endowments, corporate pensions, profit sharing and other retirement plans, municipalities, individuals, Taft-Hartley plans, and pooled investment vehicles.

Duff & Phelps Credit Rating Co. issues credit ratings on corporate bonds, preferred stocks, commercial paper, and CDs. The company is headquartered in Chicago, IL.