Ken Griffin

Ken Griffin founded and runs Citadel, a Chicago-based hedge fund that manages $28 billion in assets.He founded Citadel in 1990 but first began trading from his Harvard dorm in 1987. He put a satellite dish on the roof to get real-time stock quotes.Citadel's biggest hedge fund returned 9.1% in 2018, a year when most hedge funds lost money. Griffin also owns Citadel Securities, one of Wall Street's biggest market makers.He has donated approximately $700 million in his lifetime, including $300 million to nonprofits in Chicago.