Early Movers: GM, BDX, CI & More By: CNBC.com News May 02, 2013 at 08:11 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: Avis Budget Group Becton Dickinson Berkshire Hathaway Boston Beer Company CBS Corp Cardinal Health Cigna Corp Facebook General Motors Moody's Corp Seagate Technology Plc Tesoro Petroleum Co Visa Yelp Inc