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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.
Back to Gallery. According to Pass Fail, the Houston Chronicleâs finance analysis website, the 20 largest Houston-based oil and gas companies were valued at $868 billion in 2014. Among Houstonâs energy companies, Schlumberger had the largest market capitalization at $124 billion, making it the largest oil field services company in the world.