Regeneron, Sanofi Announce Immuno-Oncology Collaboration By: Benzinga via Benzinga July 28, 2015 at 04:39 AM EDT egeneron Pharmaceuticals, Inc. (NASDAQ: REGN) and Sanofi (NYSE: SNY) have entered into a new global collaboration to discover, ... Read More >> Related Stocks: Regeneron Pharmaceuticals Sanofi-Aventis S.A. ADR