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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 Worldâs Biggest State Owned Oil Companies. Government-controlled companies dominate the ranks of the world's largest energy producers. In fact, based on combined oil and gas production figures for 2014, 15 of the world's 20 biggest energy-producing companies are state-owned enterprises controlled by national governments.