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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.
Birch Resources is a privately held E&P company with assets in the prolific Permian Basin.
Endeavour International Corporation is one of the leading companies in the Energy & Utilities sector.
TETRA Technologies, Inc. is one of the leading companies in the Energy and Utilities sector.
Western Drilling Inc is a Taft, CA-based company in the Energy and Utilities sector.