Honestly, I couldn't tell you what it is. However, there are two general topics that haunt the stock in the near term (imo):
1) Official completion of SPA. That this process has required some back and forth has prompted some people to worry about whether or not INCY can get one. I don't doubt that they can get one, and they expected notification soon (this month). So perhaps that is now a done deal and there is relief because of it.
2) Their convertibles. Perhaps they've found a way to renegotiate these.