- Alberta Energy Company
 - Oil and gas exploration and production company. - Amadeus Petroleum NL
- Australia-based exploration and production company.
- American Shoreline, Inc. (AMSHORE)
- Oil and natural gas exploration and production company.
- Amity Oil NL
- Creating shareholder wealth through the discovery of commercial oil and gas fields in Australia and New Zealand.
- Anadarko Petroleum Corporation (1)
- Apache Corporation
- Independent oil and gas exploration and development company with operations in the United States, Canada, Egypt, Western Australia, Argentina, Poland, and China.
- Arc Energy
- Arcis Corporation
- Seismic services for the exploration needs of the oil and gas industry.
- Aspen Exploration
- Specialises in oil and gas.
- Australian Oil & Gas Corporation Limited (AOG)@
- Baker Hughes INTEQ
- Provides technology and services designed to drill wells, place them accurately in the reservoir, and to evaluate adjacent formations.
- Beach Petroleum (1)
- Bellwether Exploration Company
- Independent oil and gas company engaged in the acquisition, development, exploration, and production of oil and gas properties.
- Black Hills Exploration and Production
- Operates oil and gas wells in Colorado, Nebraska, and Wyoming.
- Bligh Oil & Minerals N.L@
- Braden Burry Expediting Services Ltd.
- Oil, gas, and mineral exploration.
- Brigham Exploration Company (1)
- Brownstone Ventures Inc.
- Brownstone Ventures Inc. is a Canadian-based, energy-focused investment company with direct interests in oil and gas projects around the world.
 Bula Resources plc
- Oil and gas exploration and development company based in Ireland, focused primarily on North Africa and the Middle East. Cairn Energy plc
- Independent Scottish energy company with interests in oil and gas exploration and production.- Canada Southern Petroleum Ltd.
- Carbon Energy Corporation
- Independent oil and gas company engaged in the exploration, development, and production of natural gas and crude oil.
- Cavell Energy Corporation
- Provides crude oil and natural gas exploration and production in western Canada.
- Century Exploration Company
- Independent oil and gas exploration and production company operating primarily onshore and offshore in the Gulf Coast Basin.
- Clayton Williams Energy
- An independent oil and gas producer engaged in the exploration for and the development of oil and natural gas.
- Continental Energy Corporation
- Focused on oil and gas exploration and development in Indonesia and off the gulf coast of Texas.
- 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.
- Cyrus Oil & Gas
- Exploration company focused on prospects in central California and west and central Texas.
- Daytona Energy Corporation
- Oil and gas explorer with properties in Australia and Liberia.
- Destiny Resource Services Corp.@
- Diaz Resources Ltd.
- An oil and gas exploration company.
- Edinburgh Oil & Gas@
- Energy Partners, Ltd. (1)
- EnerMax, Inc.
- Independent oil and natural gas company that specialises in the exploration and recovery of oil and gas reserves.
- Enterprise Oil plc
- Crude oil and natural gas exploration and production company.
- Expro Group plc@
- Falkland Oil and Gas Ltd (FOGL)
- Involved in petroleum exploration in the undrilled South Falkland and Falkland Plateau Basins, potentially a new offshore petroleum province in the South Atlantic.
- FX Energy
- Explores for oil and gas primarily in Poland and the western United States and produces oil from fields in Montana and Nevada.
- GeoDigital Information, LLC
- Provides geologic studies, exploration, and production data to the oil and gas industry.
- Gibraltar Energy
- Exploration and production company, operating primarily in the Black Warrior Basin of Mississippi.
- Givot Olam Oil Exploration
- Drills and tests for oil deposits.
- Golden Gate Resources Ltd
- Oil and gas explorer with properties in Australia, Malta, Liberia & Uganda.
- Grant Geophysical, Inc. (1)
- Harken Energy Corporation
- Explores for, develops and produces oil and gas reserves domestically and internationally.
- Henderson Petrophysics
- Offers log analysis, field studies, wellsite geology, and reserves estimation services.
- Houston Exploration Company (1)
- Hunt Oil Company
- Privately held, independent energy company, with oil exploration and production operations worldwide.
- Icon Oil NL
- Australian oil and gas explorer which has built up a portfolio in the Cooper-Eromanga and Surat-Bowen Basins of Queensland.
- Imperial Energy
- Specialising in the oil and gas sector in the Commonwealth of Independent States, with a strong emphasis on exploration and production.
- JKX Oil & Gas
- Oil and gas exploration company with interests in Ukraine, Georgia, Italy, and the Russian sector of the Caspian Sea.
- K2 Energy Corporation
- Emerging junior oil and gas exploration and production company.
- Khanty Mansiysk Oil Corporation
- Oil exploration and production company focused exclusively on the Western Siberian mineral basin of the Russian Federation.
- Lakes Oil N.L.
- Oil and gas explorer with oil and mineral prospects in Victoria, South Australia, and Queensland.
- Madison Oil Company
- Oil and gas exploration and production company.
- Magellan Petroleum Australia Limited@
- Magellan Petroleum Corporation
- McMoRan Exploration Co.
- Oil and gas company primarily engaged in the exploration, development and production of oil and natural gas properties.
- Miller Exploration
- Independent oil and gas exploration and production company with exploration efforts concentrated primarily in the Mississippi Salt Basin.
- Mosaic Oil@
- Mount Dakota Energy Corp.
- Junior oil and gas company involved in exploration and production primarily operation in the Kansas/Colorado border area.
- Navasota Resources Ltd.
- Oil and gas (helium) exploration & production company.
- Oil Search
- Oil and gas exploration and production company based in Papua New Guinea.
- Oilfield Publications Limited
- Publishes specialist reference maps, books and vessel registers for the offshore oil & gas industry worldwide.
- Output Exploration, LLC (OPEX)
- Exploration and production company focused on using advanced geophysical technologies to find oil and gas.
- Pan Andean Resources plc@
- Pancontinental Oil & Gas NL
- A junior petroleum exploration company. Services include seismic data gathering and exploration with oil and gas interests in Australia, New Zealand, and the Philippines.
- Panhandle Royalty Company
- Engaged in the ownership, acquisition, and management of mineral properties and the exploration for and development of oil and gas properties.
- Penneco Oil Company
- Operator of limited partnerships that drill developmental and exploratory natural gas and oil wells that are located in Pennsylvania and West Virginia.
- Petrobank Energy and Resources Ltd.
- Alberta-based natural gas exploration and production company.
- Petrophysics, Inc.
- Specialising in relating geological information from well logs to seismic data. Developing advanced synthetic seismogram technology.
- Petsec Energy Ltd.@
- Pioneer Oil & Gas
- Primeline Energy Holdings Inc.
- Publicly listed company focused exclusively on oil and gas exploration and upstream opportunities in China.
- ProTechnics
- Providing radioactive tracing services to the petroleum industry.
- Purcell Energy
- Oil and gas exploration, development and production company with properties in Alberta, Saskatchewan, British Columbia and the southern Northwest Territories.
- Range Resources Corporation
- Red Rock Energy Partners
- Oil and gas exploration, production, and investments.
- RigMatch Information Services, Inc.
- Delivers timely reports on Gulf-area oil and gas industry drilling via mail, fax, and electronic bulletin board.
- Rowan Companies
- Provider of international and domestic contract drilling and aviation services.
- Ruwwe & Glasscock Oil and Gas Exploration
- Explores with 3D seismic technology; exploring proven Canyon reef apron trend (Horseshoe Atoll) & the Aspermont trend (Stonewall Co).
- Sevmorneftegeofizika
- Provides offshore geophysical services, including seismic data acquisition, radio navigating, VSP, and data processing and interpretation.
- ShawCor Ltd. (1)
- Shell Exploration & Production Company
- Provides details about its oil and gas operations.
- Sibir Energy plc@
- Spinnaker Exploration (1)
- TBar Resources, LLC
- An oil and gas exploration company offering exploration, drilling, and other oil exploration services in Texas and the Gulf of Mexico.
- Technical Drilling Services, Inc.
- Author of mud logging software as well as a provider of mud logging services.
- Texas Meridian Resources Corporation
- Independent oil and natural gas exploration company.
- TGS-NOPEC Geophysical Company
- Provider of non-exclusive seismic data and associated products to the oil and gas industry.
- Tidelands Geophysical Industries
- Specialising in seismic data gathering technology for geophysical exploration.
- Tracer Petroleum
- Engaged in the acquisition, exploration, and development of natural resource properties in Indonesia and the Middle East.
- Tullow Oil
- International oil and gas exploration and production company specialising in gas-to-power projects.
- Ultra Petroleum Corporation
- Canadian junior oil and gas exploration and development company with a significant land position in the Green River Basin area of Wyoming.
- Vector Seismic Data Processing, Inc.
- Provides seismic solutions and geophysical services to the oil and gas exploration industry.
- Veteran Resources (1)
- West Oil NL
- Based in Perth, Western Australia with offshore interests in Australia and West Africa.
- Zavanna, LLC
- High-tech oil and gas exploration and development company based actively exploring in 8 U.S. and 2 Canadian basins.
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