| BP | BP - A leading energy provider |
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| Cabot Oil and Gas Corporation | As development drilling continues in the Rocky Mountains, Cabot continues to pursue an exploration program in the region which is seen as the last vast position in the lower 48 states to have substantial untapped reserves |
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| Conoco Phillips | Third largest integrated energy company in the U.S. and the fifth largest refiner in the world.
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| Exxonmobil | the company is an industry leader in almost every aspect of the energy and petrochemical business.
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| Husky Energy | Husky Energy is an integrated energy and energy-related company that ranks among Canada's largest petroleum companies in terms of production and the value of its asset base. Upstream activities are currently focused in Western Canada, offshore Eastern Canada as well as in China.
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| Marathon Oil | Operates in 18 states and many foreign areas. An integrated company including transportation, refining and product sales.
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| Petrobras | Brazilian oil producer with refineries, production and exploration areas, pipelines, and terminals. |
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| Saudi Aramco | Saudi Arabian Oil Company produces, manufactures, markets and ships crude oil, natural gas and petroleum products to meet the global demand. |
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| Shell | |
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| Texaco Inc | Texaco Inc. finds and produces oil and natural gas; manufactures and markets fuels and lubricants; operates trading, transportation and distribution facilities; and produces alternate forms of energy. |
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| TotalFinaElf | Major integrated oil and gas corporation. Based in France.
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| Tullow Oil plc | Tullow Oil plc is a UK registered company and is one of the largest Independent Exploration and Production companies in Europe. Tullow Oil is a dynamic player in the international oil and gas industry.
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