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.

CNPC (Hong Kong) Limited's mission is to find oil and gas for its customers. CNPC (Hong Kong) Limited specializes in the production and exploration for crude oil and natural gas in Asia, South America, and the Middle East. CNPC (Hong Kong) a subsidiary of China National Petroleum Corporation has a production sharing agreement with PetroChina Company, as well as other production sharing contracts to develop and produce crude oil in certain regions in China. CNPC (Hong Kong) Limited has 14 oil exploration and production projects in seven countries. CNPC (Hong Kong) plans to expand its oil reserves primarily through exploration and production partnerships with other companies.

TrueStar Petroleum wants to shine its light on new prospects for oil and gas exploration in Central and North America. TrueStar Petroleum Corporation has acquired oil and gas assets located in the Newart East Gas Field in Denton, County, Texas, which are being developed by US subsidiary Trinity Barnett LLC. The junior natural resource company has interests in 34 producing natural gas wells, and working interest partners in its various holdings include Devon Energy and Carrizo Oil & Gas. TrueStar Petroleum Corporation also is has a 10% interest in a license for oil and gas development on 554,000 acres in Guatemala. TrueStar Petroleum Corporation has proved reserves of 9.8 billion cu. ft. equivalent of natural gas. Formerly named Trinity Plumas, the company changed its name in 2005.

Abraxas Petroleum Corporation company was founded in 1977 and is based in San Antonio, Texas. Abraxas Petroleum Corporation (Abraxas) is an independent energy company primarily engaged in the development and production of natural gas and crude oil. At December 31, 2008, the Company’s properties are located in the Rocky Mountain, Mid-Continent, Permian Basin and Gulf Coast regions of the United States. On January 31, 2008, Abraxas Operating , LLC, a wholly owned subsidiary of the Partnership, consummated the acquisition of certain oil and gas properties located in various states from St. Mary Land & Exploration Company (St. Mary) and certain other sellers. In October 2009, Abraxas Petroleum Corporation closed the merger with Abraxas Energy Partners, L.P.

Titan Logix Corp. is an advanced technology industrial instrumentation and controls company. Titan Logix Corp. focus on designing, manufacturing, distributing and servicing instrumentation and automation solutions. Titan Logix Corp. has an established operating infrastructure and a range of related specialty products. Originally called Marilyn Gold Mines Inc., the company was incorporated in the province of British Columbia on February 26, 1979 and is later named Titan Resources Ltd. Titan Logix Corp. makes electronic and mechanical gauges, monitors, and controllers used to automate and oversee oil and gas drilling, pipeline transport, storage, and distribution. Its products include burner controls, level and flow equipment, spill prevention systems for mobile tankers, fluid monitors for drilling operations, and communication and control devices for off-site operations. Titan Logix sells to its customers in the US and Canada directly or through distributors.

Blueknight Energy Partners, L.P. provides terminalling, storage, processing, gathering, and transportation services for companies engaged in the production, distribution, and marketing of crude oil and liquid asphalt cement in the United States. Blueknight Energy Partners, L.P. owns and operates 46 asphalt cement terminals with approximately 7.4 million barrels of asphalt product and residual fuel oil storage capacity that enable its customers to manage their asphalt product storage, processing, and marketing activities; and crude oil terminalling and storage facilities with approximately 8.7 million barrels of storage capacity. Blueknight Energy Partners, L.P. also owns and operates two pipeline systems, the Mid-Continent system located in Oklahoma and the Texas Panhandle, and the Longview system in east Texas, which consists of approximately 1,150 miles of pipelines that gather crude oil for its customers. In addition, Blueknight Energy Partners, L.P. operates approximately 200 owned or leased tanker trucks. Blueknight Energy Partners, L.P. was formerly known as SemGroup Energy Partners, L.P. and changed its name to Blueknight Energy Partners, L.P. in December 2009. Blueknight Energy Partners, L.P. is based in Tulsa, Oklahoma.

Repsol YPF, Spain's largest oil company. A fully integrated oil and gas company, Repsol YPF operates in Latin America, the Middle East, and North Africa. The firm controls YPF, Argentina's #1 oil company, and has operations in about 30 other countries. Repsol YPF operates five refineries in Spain and one in Peru and produces chemicals, plastics, and polymers. Repsol YPF sells gas under the brands Campsa, Petronor, and Repsol at more than 6,000 service stations in Europe and Latin America. Repsol YPF is one of Spain's largest sellers of liquefied petroleum gas and liquefied natural gas. In 2008 Repsol YPF reported estimated proved reserves of 2.2 billion barrels of oil equivalent.

Able Energy, Inc. includes a number of corporations engaged in the retail distribution and provision of services relating to heating oil, propane, diesel, kerosene, gasoline (Liquid Energy) and related energy products and services. In addition to selling Liquid Energy products, Able Energy offers HVAC (heating ventilation and air conditioning) service, repair and installation. Able Energy provides retail distribution of heating oil and other fuels to more than 30,000 residential and commercial customers in Florida, New Jersey, New York, and Pennsylvania through its Able Oil subsidiary. Able Energy also installs and repairs HVAC equipment and markets gasoline and other refined petroleum products and natural gas. Moving into the travel plaza business (motor fuels and food), in 2007 Able acquired All American Plazas' truck stops in return for a 75% stake in Able, making AAP Able's largest shareholder. Able Energy has its roots in Able Oil, founded in the late 80's. Started as a one-truck operation, Able Energy has grown into a dominant Liquid Energy Company in Northern New Jersey and beyond.

Frontier Oil Corporation is an independent oil refining and marketing company with complex refineries located in Wyoming and Kansas. Frontier's primary products of gasoline and diesel are marketed in the Rocky Mountain region and Plains States. Frontier Oil Corporation is headquartered in Houston, Texas. The subsidiary company Frontier Refining & Marketing, Inc. is located in Denver, Colorado.

Apco Oil & Gas International Inc.was founded in 1970 and is headquartered in Tulsa, Oklahoma.Apco Oil & Gas International Inc. engages in the exploration and production of oil and gas properties. Apco Oil & Gas International Inc. owns interests in seven oil and gas concessions and one exploration permit in Argentina. The company primarily holds a 52.79% interest in the exploration, production, and development of oil and gas in the Entre Lomas concession located in the provinces of Rio Negro and Neuquen in southwest Argentina. Apco Oil & Gas International Inc. was formerly known as Apco Argentina Inc. and changed its name to Apco Oil & Gas International Inc. on July 16, 2009. Apco Oil & Gas International Inc. is a subsidiary of Williams Companies, Inc.

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