Tim CookeREUTERS/Robert GalbraithApple CEO Tim Cook.
Apple is among the largest publicly traded companies in the US by market capitalization (the value of its shares).
But it's hard to wrap your head around that fact.
Can you picture the value of Apple's shares, $673 billion?
The iPhone's popularity has catapulted Apple from an underdog fighting IBM to arguably the most successful consumer electronics companies out there.
To underscore how big Apple has become, we've put together some mind-blowing facts about its business.

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