Drug-stock trading under scrutiny: report By: MarketWatch December 03, 2010 at 13:17 PM EST SAC Capital, Diamondback, Balyasny, Jana lifted stakes in drug companies around the time of big mergers and acquisitions, newspaper reported. Read More >> Related Stocks: Astrazeneca Plc ADR Goldman Sachs Group Macy's Merck & Co Pfizer Senvest Capital Inc