just option manipulation. this stock is so easy to move its scary. if i and a few other big boys bought a chitload at $10 or less, it runs up and we sell calls, buy puts. then we sell heavily (still make a killing), buy back calls and sell puts (profit on both). then we buy shares again and repeat (its called rinse and repeat). Not a huge premium on the options so its worth it (look how the puts/calls jump 100% or more in a day)
aapl used to be like that, made a lot of money on the options, then the premiums got too big. no one does it now so you are seeing a much narrower range in the shares.