The AAPL-watchers at ZeroHedge.com take the view that hedge funds are heavily invested in AAPL and that if they leave the stock price will go down due to heavy selling. Further an avalanche of selling could be set in motion if 1 hedge fund sells enough to cause other hedge funds to decide to sell as well.
See e.g. http://www.zerohedge.com/news/2012-11-08/apple-enters-gravti...
Note: VWAP means "volume weighted average price" and ES refers to contracts that track the price of the S&P 500 : http://www.cmegroup.com/trading/equity-index/us-index/e-mini...