Check Out Intra-Day Apple Chart (AAPL, QQQQ)

Do you want to know why the markets rolled over this afternoon? Look at the abysmal trading in financial stocks throughout the session and look at the chart of Apple AAPL. Whoa! What just happened? Apple makes up a ridiculous 20% of the Nasdaq 100, and by extension, the heavily traded PowerShares QQQ Trust ETF QQQQ. With that kind of weighting, AAPL becomes the tail that wags the dog. What happens in AAPL is going to have a very pronounced effect on the entire stock market. At around 2:30 EST, Apple began falling fast - and so did the market. Watch this stock closely going into the close to see if it finishes on its lows for the day. Could be a good sentiment indicator.