Early Movers: CMCSA, MRK, TWX & More By: CNBC.com News May 01, 2013 at 07:53 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: Amgen Apple Bloomin' Brands Inc CVS Health Corp Comcast Corp Costco Wholesale Garmin Ltd Goldman Sachs Group Merck & Co Nuance Communicatns Time Warner Western Union