Change is one of Wall Street's few constants. Due to a combination of corporate innovation, collaboration, competition, and acquisitions, the largest publicly traded companies in the U.S. are regularly in flux.

Looking back to the start of this century, just one company, (NASDAQ: MSFT), remains on today's list of the 10 largest stocks by market cap.

As of this past weekend, five stocks were officially part of the exclusive trillion-dollar club:

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Source Fool.com