Billionaire financier Carl Icahn is reportedly at the center of an insider trading probe being conducted by the FBI and SEC.
Charles Rex Arbogast/AP
May 30, 2014 The billionaire is said to be under investigation for possibly tipping off pro golfer Phil Mickelson and sports gambler "Billy" Walters ahead of market-moving stock trades.
Dell Chairman and CEO Michael Dell in 2011.
Kimihiro Hoshino/AFP/Getty Images
September 12, 2013 Billionaire investor Carl Icahn had argued that Michael Dell's offer to investors wasn't big enough. But Dell shareholders disagreed.
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