Early movers: TWTR, TSLA, DDD, UPS, ANIP & more By: CNBC.com News December 27, 2013 at 07:51 AM EST These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: 3D Systems Corp ANI Pharma Inc Ford Motor General Motors Tesla, Inc. Teva Pharmaceutical Industries ADR Textron Twitter, Inc. United Parcel Service