Why a FDA nod isn't enough for Regeneron shares By: CNBC.com News June 10, 2015 at 12:49 PM EDT Regeneron's shares sank 4 percent despite a positive Food and Drug Administration recommendation on cholesterol drug. What gives? Read More >> Related Stocks: Amgen CVS Health Corp Express Scripts Holding Pfizer Regeneron Pharmaceuticals Sanofi-Aventis S.A. ADR