Five years have passed since Apple became the first publicly traded company to achieve a $1 trillion valuation, but a few others have followed in its footsteps. Just six companies can call themselves members of the $1 trillion club:

The odds are good that the list will be much longer in a decade. A few companies are already within striking distance of the $1 trillion threshold, and several more are headed in that direction. For instance, (NYSE: V) is currently worth $500 billion, and that figure could rise 200% to $1.5 trillion by 2033 as the secular shift toward digital payments continues.

Here's what investors should know.

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Source Fool.com