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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.
Saudi Aramco. Saudi Aramco is the largest and leading world oil company in Dhahran, Saudi Arabia. The company is a state-owned company that was founded in 1933 as the California-Arabian Standard Oil Company and renamed in 1988 as the Saudi Aramco.