Apple has become the third company to see its market capitalization top $4 trillion, underscoring its role as one of the leading publicly traded tech companies and making it the second-most valuable company in the world. Shares of the company briefly topped $269.53 soon after trading began on Tuesday, putting it above the milestone. Most Read from Fast Company Apple was the first company to top $1 trillion, $2 trillion, and $3 trillion in market capitalization. But Nvidia beat it to the $4 trillion mark, ...