A look at Leon Cooperman, subject of SEC inquiry By: CNBC.com News March 26, 2015 at 14:02 PM EDT Meet the billionaire hedge fund manager who is the subject of a new government investigation of his firm's trading activity. Read More >> Related Stocks: Actavis Plc American International Group Goldman Sachs Group HSBC HOLDING PLC 8.125 ERPETUAL CAPITAL SECURITIES Sentinelone Inc Cl A Siriusxm Holdings Inc