In spite of the inevitable volatility — all the "ups and downs" —
the U.S. stock market has proven itself over time to be one of the most important
places for investors to accumulate wealth over the long term. But while there are thousands upon thousands of companies traded
on U.S. markets, a fraction of these are super-large companies that make up the lion's share of the stock market's total value.
As a potential investor, it is important to discover which companies these are, and know a little bit about what the companies do.
In this gallery, we feature the 20 largest companies trading on U.S. markets today.
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