Ken Griffin net worth: Ken Griffin is an American entrepreneur who has a net worth of $4.1 billion dollars. Born in Daytona Beach, Florida, Ken Griffin went on to graduate from Harvard University. He began trading while in college, and had amassed a million dollars by the time he graduated. He launched his own hedge fund company, Citadel LLC, in 1990. The company was massively successful throughout the 90s and early 2000s, and Mr. Griffin regularly appeared on the lists of richest Americans published by Forbes and Fortune. His company took a beating in 2008, and he lost over a billion dollars. He has managed to recover, however, and is back at pre-recession levels. In addition to his hedge fund work, he is also a major art collector, and sits on multiple philanthropic boards. He also runs his own foundation, Citadel Group Foundation. He is currently based in Chicago, Illinois.