So here how it goes with the stock (any stock actually). The previous resistance level for REGN is $340ish. Lots of Volume there buying . Then the stock went down to resistance which was in the $278 area. Now that it went back up to $337 the people that bought at previous high are happy to sell to be almost even (novice traders they should be buying more).
So at $320 right now will probably be support. At some point in next few days weeks, REGN will break through resistance at $340ish and then the resistance will become support and its off to the races. Multitude of Upgrades will come through to send it to mid to high $300's.