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W.H. Thomas Oil Company is a Clanton, AL-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.
Production Enhancement Group, Inc., a Houston-based energy services company incorporated in Alberta, Canada, rades on the TSX under the symbol WIS.
General Oil Company is a Livonia, MI-based company in the Energy & Utilities sector.
SPT Group is a Houston, TX-based company in the Energy and Utilities sector.