Aminex is an international oil and natural gas exploration and production company with operations in the US, Africa, and North Korea. In the US it operates along the Texas Gulf Coast area. Aminex PLC owns Tanzoil NL, the largest holder of exploration acreage in Tanzania. Its completion of a well in the East Songo Songo/Nyuni area in Tanzania in 2004 was the first offshore well in East Africa for more than a decade. Aminex PLC also has operations in Egypt and Kenya. Aminex PLC has acquired a 10% stake in a North Korean resources company, Kobril Ltd. Aminex also owns AMOSSCO Ltd, an international oilfield service, supply, and logistics company.

Anadarko is the largest independent oil and natural gas exploration and production companies in the world, with approximately 2.3 billion barrels of oil equivalent (BBOE) of proved reserves at year-end 2009. The company, the largest foreign oil producer in Algeria, is a wholly owned subsidiary of Anadarko Petroleum, and has production facilities and other operating units located in the Algerian Sahara Desert. Anadarko Algeria accounts for about 15% of its parent's total revenues. Anadarko Algeria Company works closely with state-owned powerhouse Sonatrach. Anadarko Algeria is part of Anadarko Petroleum's International/Frontier division, which also oversees exploration and production activities in Brazil, China, Indonesia, and Sub-Saharan Africa.

Anderson Energy Ltd. is a publicly traded oil and gas company engaged in the exploration, acquisition, development and production of oil and natural gas in Western Canada. Anderson Energy Ltd.’s principle property is in Central Alberta. The company's development strategy is focused on shallow gas. Anderson Energy Ltd. was established as a private company on January 30, 2002. Anderson owns an interest in 477 gross (218 net) natural gas wells and 22 gross (14 net) oil wells in the central Alberta region. In 2007 the company owned a total proved reserves of 123 billion cu. ft. of natural gas. Most of Anderson Energy's production is natural gas that comes from various Edmonton Sands pools.

Antrim Energy Inc. is an international oil and gas exploration and production company. Focus areas include the UK North Sea and Argentina. Antrim's focus is regions that are underexploited or provide significant upside to smaller producers. The up-and-coming independent oil and gas exploration company is hoping to take giant steps by turning its high-impact exploration prospects in Argentina and the UK into a commercial success. Antrim Energy Inc. has assets in the Tierra del Fuego region of Argentina, as well as oil and gas interests in the UK sector of the North Sea. Antrim Energy partners with UK-based Dana Petroleum and other explorers in developing its drilling prospects. In 2008 Antrim Energy Inc. reported proved reserves of 36.1 million barrels of oil equivalent.

Apache was formed in 1954 with $250,000 of investor capital with the simple concept of becoming a significant and profitable oil company. Today, Apache Corporation is one of the world's top independent oil and gas exploration and production companies. Apache North Sea manages exploration and production activities in the Forties field for its parent Apache Corporation. Apache North Sea began drilling in the field in 2004. A core production area for Apache (averaging 70,000 barrels per day, up from 40,000 a day in 2003), the Forties field has estimated proved reserves of 189 million barrels of oil equivalent. In 2008 Apache North Sea's production of 21.9 million barrels of oil equivalent, accounted for approximately 11% of Apache's total production. In 2009 Apache North Sea Limited boosted output by bringing some seven development wells into production.

Approach Resources takes a different approach to natural gas and oil exploration, development, and production. Specializing in finding and exploiting unconventional reservoirs, Approach Resources Inc. operates primarily in West Texas' Ozona Northeast field. Approach Resources Inc. also has operations in western Kentucky, and northern New Mexico. The company's unconventional designation results from a focus on developing natural gas reserves in tight gas sands and shale areas, necessitating a reliance on advanced completion, fracturing and drilling techniques. In 2008 Approach Resources reported proved reserves of 193.7 billion cu. ft. of oil equivalent, with a reserve life index of about 19 years. Yorktown Energy Partners controls the company.

Arawak Energy reserves its energy for former Soviet Union countries. An oil and gas exploration and production company, Arawak's assets include six properties in the Pre-Caspian Basin in western Kazakhstan, as well as four properties in the Komi Republic in Russia. Arawak Energy Ltd. also has exploration operations on properties in Azerbaijan. In 2008 the company's total proved and probable reserves were 61.8 million barrels of oil equivalent (boe); that same year, its total production topped 4 million boe, most of which was produced by its operations in Kazakhstan. Formerly a publicly-owned company, Arawak was acquired by a subsidiary of Vitol Group in 2009.

Arcis offers seismic solutions to the energy industry; including, seismic data processing, participation surveys, geotechnical services, data marketing, data management, and access to an extensive data library. Arcis offers one of the most current 2D and 3D seismic data libraries for the Western Canadian Sedimentary Basin, including North East British Columbia. Arcis' seismic solutions provide real business value to clients by reducing the risks associated with drilling, and by lowering finding and development costs.

Arena Resources, Inc. engages in the acquisition, exploration, development, and production of oil and natural gas properties. Arena Resources, Inc. owns interest in oil and gas properties in Oklahoma, Texas, New Mexico, and Kansas. Arena Resources, Inc. principal properties in New Mexico comprise East Hobbs San Andres Unit, Seven Rivers Queen Unit, Humphrey Queen Unit, Langlie Mattix Queen Unit, South Leonard Queen Unit, North Benson Queen Unit, and Red Lake Unit, as well as Phillips Lea, Hale State, State 36, and Corbin 35 leases. It also holds interest in Fuhrman Mascho leases located in Andrews County, Texas; and Y6 lease situated in Fisher County, Texas; Ona Morrow Sand Unit located in Cimarron and Texas Counties, Oklahoma; Eva South Morrow Sand Unit located in Texas County, Oklahoma; and Midwell, Appleby, Smaltz, and Hanes Leases located in Cimarron County, Oklahoma. Arena Resources primarily sells its oil and natural gas production to end users, marketers, and other purchasers. As of December 31, 2008, Arena Resources, Inc. had proved reserves of approximately 65,646,034 barrels of oil equivalent. Arena Resources, Inc., through its subsidiaries, also involves in the drilling operations. Arena Resources was founded in 2000 and is based in Tulsa, Oklahoma.

Atlas Energy, Inc. operates as an independent natural gas and oil producer principally in Pennsylvania, Michigan, and Tennessee. Atlas Energy, Inc. holds interests in various properties located in the Appalachian Basin; the New Albany shale in Indiana; the Antrim Shale located in northern Michigan; and the Chattanooga Shale located in Tennessee. Atlas Energy, Inc. also provides natural gas gathering services in the Anadarko, Arkoma, and Permian Basins, as well as the Golden Trend in the southwestern and mid-continent United States. In addition, Atlas Energy, Inc. offers natural gas processing and treatment services in Oklahoma and Texas; and interstate gas transmission services in southeastern Oklahoma, Arkansas, southern Kansas, and southeastern Missouri. Atlas Energy, Inc. owns and operates approximately 7,900 miles of intrastate gas gathering pipeline and a 565-mile interstate natural gas pipeline in the Mid-Continent region; and approximately 1,600 miles of natural gas gathering pipelines in Appalachia. Atlas Energy, Inc. is based in Moon Township, Pennsylvania.

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