15 Largest Gas Companies in the US

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13. Marathon Oil (NYSE: MRO)

Revenue: $5.1 billion
Market Cap: $5.4 billion
Headquarter: Houston, TX

The company was founded in 1888 and was formerly known as USX Corporation before renaming it as Marathon Oil. Marathon Oil Corp. is involved in the production, development, and distribution of liquid hydrocarbons and natural gas. The company also engages in the production of oil and gas internationally mainly in Equatorial Guinea and the UK. The company announced net reserves of 1.2 billion barrels of oil equivalent at the end of 2019.

Marathon Oil Corporation (NYSE:MRO)

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