Time Inc.'s Fortune magazine released its annual Fortune Global 500 list, which is a ranking of the top 500 corporations worldwide as measured by revenue.

In this year's list, the US companies made up the majority with 133 companies but was down from 185 a decade ago. Followed by 68 Japanese companies and 61 Chinese companies.

For the second year in a row, Wal-Mart holds the number one spot with revenues of more than $421 billion. Wal-Mart appears eighth time in the list's history. Royal Dutch Shell, Exxon Mobil, General Motors and Mitsubishi are the only other companies to ever top the Global 500.

The top-ten biggest companies ranked by revenue in the US are: Wal-Mart Stores, Exxon Mobil, Chevron, ConocoPhillips, Fannie Mae, General Electric, Warren Buffett's Berkshire Hathaway, General Motors, Bank of America Corp., and Ford Motor Company.

Start slideshow to view a gallery of the top 10 biggest companies in the US.

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