Apple Most Valuable Company Ever

With its market cap climbing to an eye-popping $621 billion on Monday, Apple (AAPL: 659.16, +11.05, +1.70%) has a new feat to add to its lengthy resume: most valuable company ever.

The latest increase in Apple's valuation nudges the tech behemoth above the record set by software behemoth Microsoft (MSFT: 30.74, -0.16, -0.52%) back in 1999 before the bursting of the tech bubble.

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