Early movers: PPS, BBY, DECK, AGN, FB, ATVI, TWTR, TSLA & more By: CNBC.com News August 15, 2016 at 08:01 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: Activision Blizzard Allergan Plc American Eagle Outfitters Apple Best Buy Boeing Co Deckers Outdoor Corp Dollar General Facebook General Motors Hca Holdings Inc International Business Machines Quorum Health Corp Signet Jewelers Ltd Tesla, Inc. Tiffany & Co Twitter, Inc. Xylem