Calamos' history traces back to the challenging markets of the 1970s, when John P. Calamos, Sr. began his investment career using convertible securities to help clients build wealth and manage risk. The hallmarks of those early days—innovation, risk management and client focus—continue to define the organization today. Calamos' investment solutions include alternative, equity, sustainable, multi-asset, fixed income and convertible strategies.

At S&P Dow Jones Indices, we provide iconic and innovative index solutions backed by unparalleled expertise across the asset-class spectrum. We’re the largest global resource for index-based concepts, data and research and home to iconic financial market benchmarks such as the S&P 500®, Dow Jones Industrial Average® and iBoxx® index series. More assets are invested in products based upon our indices than any other index provider in the world. Our solutions bring transparency to global capital markets and are widely considered essential in tracking market performance, evaluating portfolios and developing investment strategies.  S&P Dow Jones Indices is a division of S&P Global (NYSE: SPGI). S&P Global enables businesses, governments and individuals with trusted data, expertise and technology to make decisions with conviction. We are Advancing Essential Intelligence through world-leading benchmarks, data and insights that customers need in order to plan confidently, act decisively and thrive in a rapidly changing global landscape.