Regeneron (REGN) shares zoom up 8.5% and counting after resuming trading following news that...

|About: Regeneron Pharmaceuticals... (REGN)|By:, SA News Editor

Regeneron (REGN) shares zoom up 8.5% and counting after resuming trading following news that Sanofi (SNY) aims to own up to $500M of stock in the company. The French firm says it could increase its stake in Regeneron "within (the) terms" of their partnership but has no plans to buy a controlling stake. Investors don't seem to be buying that line at the moment.