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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.
Peak Completion Technologies, Inc. Provides a full line of standard and custom oilfield completion solutions.
Harper Oil Co. is a Springfield, IL-based company in the Energy & Utilities sector.
Parker Oil Co Inc is a Wichita, KS-based company in the Energy and Utilities sector.