Two months after losing its title as the most valuable U.S. public company, and a month after revealing that iPhone sales were disappointing in the holiday season, Apple has regained its throne as the world's biggest company. Apple ended the session with a market capitalization of $821.6 billion, according to FactSet data. That performance was good enough to land atop Microsoft and Amazon.com, which both declined 1.1 percent on the day.
What's most remarkable is how similar the valuations are for America's top four companies. At the end of yesterday's trading, they looked like this: