Apple shares fell more than 4% in premarket trading on Tuesday. The stock's losses come after the release of its fiscal fourth-quarter earnings report, which showed revenue higher than analysts' expectations, but Apple's iPad sales fell short of expectations in the quarter ended in September, and it also issued profit margin forecasts that disappointed investors.

Apple shares fell more than 4% in premarket trading on Tuesday. The stock's losses come after the release of its fiscal fourth-quarter earnings report, which showed revenue higher than analysts' expectations, but Apple's iPad sales fell short of expectations in the quarter ended in September, and it also issued profit margin forecasts that disappointed investors.