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Calamos Investments

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Adapted from the English Wikipedia article Calamos Investments, available under CC BY-SA 4.0Updated 28 November 2025
Calamos Investments
Company typePrivate
IndustryInvestment management
Founded1977
FounderJohn Calamos
Headquarters
Naperville, Illinois
,
United States
Area served
Global
Key people
John S. Koudounis (President and CEO), John Calamos (Chairman and CIO)
ProductsActive growth equity, risk-managed approaches, convertible securities, sustainable equity, fixed income, alternative investments; mutual funds, closed-end funds, private funds, exchange-traded fund, UCITS funds
Number of employees
300+
Websitewww.calamos.com

Calamos Investments is a globally diversified investment firm delivering a variety of strategies such as active growth equity, risk-managed approaches, convertible securities, sustainable equity, fixed income, and alternative investments. These offerings are accessible through separately managed accounts, mutual funds, closed-end funds, private funds, an exchange-traded fund, and UCITS funds. The firm's clientele encompasses corporations, pension plans, endowments, foundations, individual investors, and financial advisors. Headquartered near Chicago, Calamos also operates offices in New York, San Francisco, Milwaukee, and Miami.

History

Originating in the 1970s as a boutique manager focused on convertible securities, Calamos crafted investment approaches aimed at achieving superior returns while controlling risk. Founder John Calamos emphasized the complementary relationship between convertible bonds and options markets as essential for effective risk management. In 1990, the company introduced its Market Neutral Income Fund, among the earliest liquid alternative investment products designed to offer hedge fund-like strategies to retail investors.

Calamos employs more than 300 professionals at its Naperville, Illinois location, supported by sales and client service teams along with investment advisors under Calamos Wealth Management throughout the United States. In 2016, John S. Koudounis was named president and CEO as part of a planned leadership transition; founder John Calamos continued serving as chairman and chief investment officer. Under Koudounis’s direction, the firm broadened its product lineup through targeted acquisitions into areas including global long-short equity, small-cap equities, and ESG-focused investments.

External links