Chardan Downgrades Regeneron To Sell By: Benzinga via Benzinga March 16, 2016 at 16:12 PM EDT Chardan Capital Markets analyst Gbola Amusa has downgraded Regeneron Pharmaceuticals Inc (NASDAQ: REGN) to Sell after Amgen, Inc. ... Read More >> Related Stocks: Amgen Regeneron Pharmaceuticals Sanofi-Aventis S.A. ADR