Early movers: COST, HRB, MMM, GM, MSFT, MA & more By: CNBC.com News December 11, 2013 at 07:35 AM EST These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: 3D Systems Corp 3M Co Cisco Systems Discovery Comm B Discovery Communications General Motors Groupon Cl A H&R Block Laboratory Corp American Holdings MasterCard Microsoft Nokia Corp ADR Scripps Networks Interactive Urban Outfitters