I think these articles need to come with the caveat of "markets move and shift". I'm sure no one at Apple is panicking, it's easy to be lured into watching the share prices as a statistic of success but Apple has enough cash in stockpile that their share price isn't overly important, unless you're a shareholder.

If it dropped 20% in a day I think it'd be safe to say there was a loss of investor confidence.