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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 company's Shell Exploration & Production unit focuses its exploration on the deepwater plays in the Gulf of Mexico. Shell Oil partners with Saudi Aramco in a US refining and marketing venture (Motiva) and owns Motiva's sister company Shell Oil Products US. Shell Oil also produces petrochemicals (Shell Chemical) and liquefied natural gas (Shell US Gas & Power) and markets natural gas and electricity. Shell Oil's parent, Royal Dutch Shell, vies with Exxon Mobil) to be the world's #1 integrated oil company in terms of revenues.