Stevie Cohen's hedge fund SAC Capital faces regulatory investigations and lawsuits alleging insider trading after Cohen made large trades ahead of negative clinical trial results for a Alzheimer's drug, saving the fund $276 million. The trades were based on advice from portfolio manager Mathew Martoma, who received illegal tips from a doctor involved in the trial. As a result of multiple guilty pleas and ongoing cases, SAC has lost outside investors and will likely become a single-family office run solely by Cohen, who could settle the civil suit by agreeing to pay fines and be barred from the industry.