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Marathon Oil Corporation (NYSE: MRO) is an independent international exploration and production company. Based in Houston, Texas, Marathon Oil had net proved reserves at the end of 2011 of 1.8 billion barrels of oil equivalent in North America, Europe and Africa.
Oil Optimization Inc is a Canadian listed international oil and gas company focused on discovering hydrocarbons on its petroleum concession onshore Thailand.
Hunting plc is a British-based supplier to the oil and gas industry.
DDX Corp is a Englewood, CO-based company in the Energy & Utilities sector.