Khanty Mansiysk Oil Corporation - oil exploration and production company focused exclusively on the Western Siberian mineral basin of the Russian Federation.

Anadarko Petroleum Corporation - services for oil and gas exploration and development.

Alberta Energy Company - oil and gas exploration and production company.

Apache Corporation (NYSE:APA) - independent oil and gas exploration and development company with operations in the United States, Canada, Egypt, Western Australia, Argentina, Poland, and China.

TGS-NOPEC Geophysical Company - provider of non-exclusive seismic data and associated products to the oil and gas industry.

Harken Energy Corporation - explores for, develops and produces oil and gas reserves domestically and internationally.

Oilfield Publications Limited - publishes specialist reference maps, books and vessel registers for the offshore oil & gas industry worldwide

Oil Search - oil and gas exploration and production company based in Papua New Guinea.

Cairn Energy plc - independent Scottish energy company with interests in oil and gas exploration and production.

Rowan Companies (NYSE:RDC) - provider of international and domestic contract drilling and aviation services.

Hunt Oil Company - privately held, independent energy company, with oil exploration and production operations worldwide.

Brigham Exploration Company - oil and gas exploration and development company focusing on the implementation of 3D seismic techniques.

FX Energy - explores for oil and gas primarily in Poland and the western United States and produces oil from fields in Montana and Nevada.

Canadian Southern Petroleum Ltd. - It is engaged in the exploration for and development of oil and gas reserves in Canada.

Houston Exploration Company - independent natural gas and oil company engaged in the exploration, development and acquisition of domestic natural gas and oil properties.

Curlew Lake Resources - independent oil and gas exploration, development, and production company with operations in the western sedimentary basins of Canada and the United States.

Clayton Williams Energy (Nasdaq:CWEI) - an independent oil and gas producer engaged in the exploration for and the development of oil and natural gas.

Texas Meridian Resources Corporation - independent oil and natural gas exploration company.

Tullow Oil - international oil and gas exploration and production company specialising in gas-to-power projects.

Baker Hughes INTEQ - provides technology and services designed to drill wells, place them accurately in the reservoir, and to evaluate adjacent formations.

Austral Pacific Energy Ltd. - to explore and develop areas that have potential for the discovery of substantial petroleum reserves. The company is focused exclusively in the Australasian region, which is recognized and categorized as politically stable, and one of the most active exploration areas in the world.

Range Resources Corp. - Range Resources is an independent oil and gas company which operates in the Appalachian, Southwestern and Gulf Coast regions of the United States.

McMoRan Exploration Co. - oil and gas company primarily engaged in the exploration, development and production of oil and natural gas properties.

Antares Energy - creating shareholder wealth through the discovery of commercial oil and gas fields in Australia and New Zealand.

Givot Olam Oil Exploration - drills and tests for oil deposits.