Spectrum ASA provides surveys, 2D and 3D seismic data processing, and electronic data management services for oil and gas exploration and production customers worldwide. Spectrum ASA provides information technology consultancy, network design, and system installation services, and has regional centers in Houston, London, Oslo, and Singapore. Spectrum ASA has also developed software that enables vintage seismic data to be loaded onto a workstation for interpretation. UK-based Spectrum Energy and Information Technology was founded in 1985. Spectrum ASA merged with Norway's Global Geo Services to form GGS-Spectrum Limited in 2005. Spectrum was spun out in 2008.

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.

Tesoro Corporation, a Fortune 100 company, is an independent refiner and marketer of petroleum products. Tesoro, through its subsidiaries, operates seven refineries in the western United States with a combined capacity of approximately 665,000 barrels per day. Tesoro's retail-marketing system includes over 870 branded retail stations, of which over 380 are company operated under the Tesoro®, Shell®, Mirastar® and USA Gasoline™ brands. A pioneer of oil refining in Alaska, Tesoro Alaska is a regional oil refinery and refined petroleum products marketing unit of Tesoro Corporation. The unit manages Tesoro Corporation's and Alaska's first oil refinery, at Kenai. The 72,000 barrels-a-day refinery produces gasoline, liquefied petroleum gas, heavy oils, bunker fuels, and liquid asphalt, as well as distillates (jet fuel, diesel fuel, and heating oil). The plant's primary product is jet fuel for Anchorage International Airport, located 70 miles from the refinery. A 40,000-barrels-per-day pipeline connects the refinery with the airport. The Kenai refinery also supplies gasoline and diesel to about 90 Tesoro-branded retail outlets in Alaska.

ONEOK Partners gasses up and ships its products through interstate natural gas pipelines in 10 states. Its pipelines include Midwestern Gas Transmission, Guardian Pipeline, Viking Gas Transmission, and OkTex Pipeline. It operates 14,300 miles of gas-gathering pipeline and 5,630 miles of transportation pipeline, as well as gas processing plants and storage facilities. It also owns one of the US's top natural gas liquids (NGL) systems, and operates a parking garage and leases office space in Tulsa. ONEOK holds a 46% stake in ONEOK Partners and 100% of its general partner.

GeoPetro Resources Company was incorporated in 1994 and is based in San Francisco, California. GeoPetro Resources Company, an oil and gas company, together with its subsidiaries, engages in the exploration for, and leasehold acquisition, development drilling, and production of crude oil and natural gas reserves in North America, Australia, and Indonesia. GeoPetro Resources Company's projects encompass approximately 379,547 gross acres, consisting of mineral leases, production sharing contracts, and exploration permits that provide the right to explore for, develop, and produce oil and natural gas. GeoPetro Resources Company was formerly known as GeoPetro Company and changed its name to GeoPetro Resources Company in June 1996 as a result of merger with its subsidiary, GeoPetro Resources Subsidiary Company.

Dragon Oil plc is an independent oil development and production company, registered in Ireland and listed under a dual primary listing on the London and Irish Stock Exchanges. Approximately 52% of the Company’s equity is held by the Emirates National Oil Company (ENOC) L.L.C. (“ENOC”), a company owned by the Government of Dubai. Dragon Oil is headquartered in Dubai and its principal development and production activity is the development of its asset in the Cheleken Contract Area, offshore Turkmenistan by a Group subsidiary, Dragon Oil (Turkmenistan) Limited. Dragon Oil had proved and probable oil reserves at 30 June 2008 of 645 million barrels and 3.2 trillion cuft of gas resources. The company reports recoverable proved and probable reserves of 645 million barrels of oil and condensate in the Cheleken area. Dragon Oil PLC is a subsidiary of the Emirates National Oil Company. Dragon Oil PLC owns a 52% stake in Dragon Oil, but in 2009 bid to acquire 100%. Shareholders rebuffed the offer.

Dakota Gasification Company (Dakota Gas), owns and operates the Great Plains Synfuels Plant (Synfuels Plant). The Synfuels Plant is the only commercial-scale coal gasification plant in the United States that manufactures natural gas. Dakota Gasification Company is also the cleanest energy plant operating in the state of North Dakota, according to a comparison of emissions data available from the North Dakota Department of Health. The Great Plains Synfuels Plant harnesses the abundant coal resources underlying the North Dakota prairie. The gasification process transforms more than 6 million tons of coal into more than 54 billion cu. ft. of natural gas annually, which is then used to supply the Eastern US. In addition to natural gas, the company's Synfuels plant produces carbon dioxide, fertilizers, solvents, phenol, and other chemicals.

XTO Energy was founded in 1986 and is headquartered in Fort Worth, Texas. XTO Energy Inc., together with its subsidiaries, engages in the acquisition, development, exploitation, and exploration of producing oil and gas properties in the United States. XTO Energy Inc. also engages in the production, processing, marketing, and transportation of oil and natural gas. The company's properties are concentrated in Texas, Arkansas, Montana, Louisiana, Oklahoma, New Mexico, Utah, Kansas, West Virginia, Colorado, Wyoming, Pennsylvania, and North Dakota. As of December 31, 2008, XTO Energy Inc. had estimated proved reserves of 11.80 trillion cubic feet of natural gas, 76 million barrels of natural gas liquids, and 268 million barrels of oil; and owned interests in 18,235.7 net producing wells. XTO Energy markets its gas to brokers, local distribution companies, and end-users. XTO Energy Inc. was formerly known as Cross Timbers Oil Company and changed its name to XTO Energy Inc. in June 2001.

Storm Cat Energy is an independent oil and gas company focused, on the exploration, production and development of large unconventional gas reserves from fractured shales, coal beds and tight sand formations and, secondarily, from conventional formations. Storm Cat Energy Corporation has producing properties in Wyoming's Powder River Basin, and Arkansas' Arkoma Basin and exploration and development acreage in Canada. Storm Cat's long-term strategy is to grow through development and via the acquisition of prospective acreage that compliments its existing assets and exploits the abilities of Storm Cat Energy Corporation technical team. Its core producing properties are in coalbed methane gas fields in the Powder River Basin of Wyoming. Storm Cat Energy Corporation also has interests in oil and gas projects in Alaska and in Alberta, British Columbia, and Saskatchewan in Canada. In late 2008 Storm Cat Energy placed its US subsidiaries under bankruptcy protection.

The company was founded in 1920 and is based in Tulsa, Oklahoma. Helmerich & Payne, Inc. engages in the contract drilling of oil and gas wells in the United States and internationally. Helmerich & Payne, Inc. provides drilling rigs, equipment, personnel, and camps on a contract basis to explore for and develop oil and gas from onshore areas and from fixed platforms, tension-leg platforms, and spars in offshore areas. Helmerich & Payne, Inc. conducts domestic land drilling primarily in Oklahoma, California, Texas, Wyoming, Colorado, Louisiana, Mississippi, Pennsylvania, Utah, Arkansas, New Mexico, and North Dakota; and offshore drilling in the Gulf of Mexico, offshore of California, Trinidad, and Equatorial Guinea. As of September 30, 2009, the company had 201 land drilling rigs in the United States; 9 offshore platform rigs; and international land rigs, including 1 in Venezuela, 6 in Colombia, 4 in Ecuador, 9 in Argentina, 1 in Tunisia, and 6 rigs in Mexico. In addition, Helmerich & Payne engages in the ownership, development, and operation of commercial real estate properties, as well as the research and development of rotary steerable technology.

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