Apple stock down 40 percent from September's high

Apple Inc. stock touched as low as $419 Monday its weakest point since January 2012 before closing down 2.4 percent at $420.05.

The Cupertino, Calif., company's Jan. 23 report signaled that its fast growth phase, rare for a company of its size, may be coming to an end.

Apple's stock price peaked in September at $705.07 on the day the iPhone 5 was released. With Monday's close, the stock has dropped 40 percent from the record high.