What else is new? Whoever drove the stock price up to $8 and above has obviously fallen out of love. Like ashton said, maybe one or more institutions is bailing in a steady fashion and putting a lid on the stock price.
You can only keep a good company down for so long. Once the Phase 3 with Abbott launched it's a whole new ballgame as NBIX will start to come up regularly in Abbott presentations. This goes the way of Rigel.