Early Movers: TSN, PFE, JPM & More By: CNBC.com News May 06, 2013 at 07:59 AM EDT These are the stocks posting the largest moves before the bell. Read More >> Related Stocks: Aetna Berkshire Hathaway Caterpillar Humana Intel Corp JPMorgan Chase & Co Macerich Co Pfizer Toyota Motor Corp Ltd Ord ADR Tyson Foods UnitedHealth Group