Early movers: PBR, MMM, CAT & more By: CNBC.com News April 23, 2015 at 08:12 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: 3M Co Caterpillar Comcast Corp Comcast Corp Dow Chemical Eli Lilly General Motors Hershey Co Novartis Ag ADR PepsiCo Petrobras - Petroleo Brasileiro S.A. Procter & Gamble Time Warner Cable