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Source: CNN Money. Exxon is the second largest company in the US as far as revenues go. However, its revenues have dropped by more than 7 percent from the previous year along with decreased oil production and increasing exploration expenditures.
The Saudi Arabian Oil Company, also known as Saudi Aramco, is the world's largest oil company. In 2014, it produced 9.5 million barrels of oil per day, more than twice the production of the next biggest producer.