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Citation Oil & Gas Corp. is one of the leading companies in the Energy & Utilities sector.
re trac is a Brandon, SD-based company in the Energy & Utilities sector.
Seneca Resources Corporation, the exploration and production segment of National Fuel Gas Company, headquartered in Houston, Texas, explores for, develops and produces natural gas and oil reserves in California, Kansas and the Appalachian Region including the Marcellus and Utica Shales.
Peter Hunter is a Windsor, CA-based company in the Energy and Utilities sector.
Shell Oil Company is the United States-based wholly owned subsidiary of Royal Dutch Shell, a transnational corporation "oil major" of Anglo-Dutch origins, which is amongst the largest oil companies in the world.