Apple (AAPL) -1.6% premarket, adding to a 6.4% Wednesday drop that seems to be related to higher margin requirements, though a Digitimes column and even IDC's tablet share forecast have been named as possible reasons. TA believers note shares are nearing a "death cross" - the point where the 50-day moving average drops below the 200-day average. A Birinyi analyst observes Apple has historically struggled in the month following a cross, but outperformed in the following 3 months. Shares are back to trading around 8.4x FY13E EPS exc. cash.