Apple shares fall 12% on growth fears
Apple shares have tumbled 12% as investors fret over whether the company could lose its dominance in the smartphone market.
About $50bn (£32bn) was wiped off Apple's value after the biggest daily drop in the firm's stock in four years.
Flat profits and record quarterly revenue of $55bn were not enough to overcome disappointment over sales of the company's new iPhone 5.
Analysts said the firm was in danger of becoming a victim of its own success.
Earlier, shares in some of Apple's key Asian suppliers also fell.
LG, which provides displays for Apple products, fell 3.1%, and Hon Hai, which assembles iPhones and iPads, dropped 3.2%.