Berry Petroleum company was founded in 1909 and is headquartered in Denver, Colorado.Berry Petroleum Company engages in the production, development, acquisition, exploitation, and exploration of crude oil and natural gas in the United States. The company's properties are located in California, Texas, Utah, and Colorado. As of December 31, 2008, it had estimated proved reserves of 245.9 million barrels of oil equivalent. Berry Petroleum company also engages in the generation and sale of electricity. Berry Petroleum Company markets its crude oil to oil refiners or third party marketers.

Advantage Oil & Gas Ltd. was founded in 2001 and is headquartered in Calgary, Canada. Advantage Oil and Gas Ltd. is an intermediate oil and natural gas corporation with properties located in Western Canada. The Corporation's common shares trade on the Toronto and New York Stock Exchanges under the symbol AAV with its head office in Calgary, Alberta, Canada. In 2008 the company reported about 547,912 net acres of undeveloped land, and proved and probable reserves of 174.8 billion cu. ft. of natural gas equivalent. It focuses on developing the Montney natural gas resource play located at Glacier, Alberta. The company was formerly known as Advantage Energy Income Fund and changed its name to Advantage Oil & Gas Ltd.

Wintershall is a wholly owned subsidiary of BASF, which is based in Ludwigshafen, and specializes in energy. Wintershall is active in various regions of the world in the exploration and production of crude oil and natural gas. In Europe the BASF subsidiary trades and sells natural gas. Wintershall Holding AG also markets storage capacities for oil and gas, transportation capacities for gas as well as optic fiber capacities. Wintershall has been active in the exploration and production of oil and gas for more than 75 years, and with its headquarters in Kassel, Wintershall Holding AG is now Germany’s largest producer of crude oil and natural gas. In its exploration and production activities, Wintershall deliberately focuses on selected core regions where the company possesses a wealth of regional and technological expertise. These regions include Europe, North Africa, South America as well as Russia and the Caspian Sea region. In addition, these operations are complemented by the Wintershall Holding AG growing exploration activities in the Arabian Gulf.

Oil Search Limited was established in 1929.The company expanded its Papua New Guinea-based operations through a merger with oil and gas and mineral explorer Orogen Minerals. Oil Search ranks as Papua New Guinea's largest exploration and production company, with proved and probable reserves of 1 billion barrels of oil equivalent. As operator of Papua New Guinea's producing oil and gas fields, in 2007 Oil Search was responsible for generating 16% of Papua New Guinea's Gross Domestic Product and 22% of its export revenue. Abu Dhabi's International Petroleum Investment Company owns 17.6% of Oil Search.

ShawCor has the pipeline industry sealed up. The company provides products and services for the pipeline and pipe services, and petrochemical and industrial segments of the oil and gas industry and other industrial markets worldwide. ShawCor Ltd. pipeline segment makes specialty coating systems and joint-protection products, and provides weld inspections services, and pipeline inspection and repair. Products made by the petrochemical and industrial segment include wiring, cables, and heat-shrink tubing. ShawCor operates through Bredero Shaw, Canusa-CPS, DSG-Canusa, Guardian, ShawFlex, and Shaw Pipeline Services, and has offices in more than 20 countries.

Covanta Energy is an internationally recognized owner and operator of Energy-from-Waste and power generation projects.The major operating arm of Covanta Holding, the power producer has interests in 60 power plants located in the Americas, Asia, and Europe. Its plants use a variety of fuels, including municipal solid waste, wood waste (biomass), landfill gas, water (hydroelectric), natural gas, coal, and heavy fuel. Covanta Energy has 30 waste to energy plants worldwide. These specialized plants can convert 16 million tons of waste into more than 8 million MW hours of electricity annually and create 10 billion pounds of steam that are sold to a variety of industries.

Belgium-based Fabricom GTI operates four business units that serve separate customer groups. Fabricom GTI Industry unit specializes in industrial installations and has four regional divisions and two cross regional divisions that focus on maintenance and services and process systems. Major Projects works on piping, mechanical, electrical, and instrumentation for multidisciplinary projects in all market segments that use large-scale industrial equipment and systems. Infra provides electromechanical installations in the infrastructure market. Fabricom GTI International operations offers services through subsidiaries located throughout Western Europe. Fabricom GTI is an indirect subsidiary of GDF SUEZ.

St. Mary Land & Exploration Company was founded in 1908 and is based in Denver, Colorado. St. Mary Land & Exploration Company, together with its subsidiaries, engages in the exploration, exploitation, development, acquisition, and production of natural gas and crude oil in North America. St. Mary Land & Exploration Company primarily operates in the ArkLaTex, the Mid-Continent, the Gulf Coast, the Permian, and the Rocky Mountain regions. As of December 31, 2008, it had estimated proved reserves of 51.4 million barrels of oil and 557.4 billion cubic feet of natural gas.

STAG is recognised as a leading provider of practical solutions to its expanding customer base of major multinationals & emerging independents worldwide. Stag Geological Services provides geological field services to companies that want to outsource their well site evaluation operations. Stag Geological Services Limited services include geological well surveys, reservoir evaluation, well logging, seismic sampling, and well site testing. Stag Geological Services Limited also provides consulting services, including operations planning, materials procurement, formation evaluation, and geological assistance during initial well drilling. Stag Geological Services was founded in 1995. Saudi Aramco, BP Exploration, Chevron, Exxon Mobil, and Kerr McGee are among its customers.

Natural Gas Services Group, Inc. provides horsepower compression equipment to the natural gas industry in the United States. Natural Gas Services Group, Inc. primarily provides small to medium horsepower natural gas compression equipment on rental basis. Natural Gas Services Group, Inc. manufactures, fabricates, and rents natural gas compressors that enhance the production of natural gas wells, gas transportation lines, and processing plants; and provides maintenance services to compressors. Natural Gas Services Group, Inc. involves in the assembly of compressor components into compressor units, which are manufactured by the company or third parties; and designs and manufactures compressor frames, cylinders, and parts. Natural Gas Services Group, Inc. also engages in the design, fabrication, sale, installation, and service of flare stacks, and related ignition and control devices for the onshore and offshore incineration of gas compounds, such as hydrogen sulfide, carbon dioxide, natural gas, and liquefied petroleum gases; and provides an exchange and rebuild program for screw compressors, and maintains an inventory of new and used compressors. Natural Gas Services Group was founded in 1998 and is based in Midland, Texas.

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