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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.
4. ExxonMobil ($394 billion) â the Texas-based oil major is one of the most iconic oil companies, and it is the largest private company by production with 5.3 mb/d. When Exxon acquired Mobil in 1999 â both companies are descendants of John D. Rockefellerâs Standard Oil â it created the largest company on the planet.