Apple shares have fallen below $600 today for the first time since July. The shares, currently down 2.25 percent to $590.30 are well off their 52-week high of $704 in late September. Investor sentiment is being weighed down by recent management changes, including the departure of iOS head Scott Forstall and short-lived retail stores chief John Browett. A “disappointing” first week of iPhone 5 sales and more expensive than expected iPad mini are also contributing. [Source NASDAQ]