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Kolkhorst Petroleum Company is a Navasota, TX-based company in the Energy and Utilities sector.
Swift Services is a Ness City, KS-based company in the Energy and Utilities sector.
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.
Alpetro Resources Ltd. is a Calgary, AB-based company in the Energy and Utilities sector.
Manti Resources is a Corpus Christi, TX-based company in the Energy and Utilities sector.