John Koudounis
President and CEO
Calamos Investments
John Koudounis serves as the President and CEO of Calamos Investments, the third largest liquid alternatives asset manager in the US. Under his leadership, the firm’s AUM has surged to over $46 billion, nearly tripling since he took the helm in 2016. Notably, he has overseen the launch of innovative products, including the world's first suite of downside-protected Bitcoin ETFs.
With over 37 years of experience in the financial services sector, he previously held the position of President and CEO at Mizuho Securities in the Americas, where he significantly expanded the firm's capital markets teams and enhanced profitability, client base, and product diversity, elevating Mizuho to a top-tier global investment bank.
In addition to his corporate responsibilities, Koudounis is recognized for his thought leadership, frequently speaking at global conferences and platforms such as CNBC, Fox Business, and Bloomberg TV. Koudounis is committed to philanthropy and is involved with several organizations including the Concordia Leadership Council, the SEAL Future Foundation, The Hellenic Initiative, and the Ecumenical Bartholomew Foundation.
He holds a degree in International Diplomacy & Foreign Affairs and Economics from Brown University.
With over 37 years of experience in the financial services sector, he previously held the position of President and CEO at Mizuho Securities in the Americas, where he significantly expanded the firm's capital markets teams and enhanced profitability, client base, and product diversity, elevating Mizuho to a top-tier global investment bank.
In addition to his corporate responsibilities, Koudounis is recognized for his thought leadership, frequently speaking at global conferences and platforms such as CNBC, Fox Business, and Bloomberg TV. Koudounis is committed to philanthropy and is involved with several organizations including the Concordia Leadership Council, the SEAL Future Foundation, The Hellenic Initiative, and the Ecumenical Bartholomew Foundation.
He holds a degree in International Diplomacy & Foreign Affairs and Economics from Brown University.