PetroBakken Energy is developing its holdings in the Bakken oil shale play in southeast Saskatchewan. Formerly an oil and gas explorer and producer in Alberta and Saskatchewan, in 2009 PetroBakken Energy Ltd. (as TriStar Oil and gas) combined with the Canadian business unit of Petrobank Energy and Resources to form PetroBakken Energy, solely focused on the Bakken Shale play. PetroBakken Energy has estimated proved plus probable reserves of 127 million barrels of oil equivalent, and produces about 37,000 barrels per day. Petrobank Energy controls about two-thirds of the company. In 2010 PetroBakken Energy agreed to buy Canadian junior oil and gas firms Berens Energy for $319 million and Result Energy for $480 million.

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.

Truman Arnold Companies (TAC) markets and distributes more than 1 billion gallons of petroleum products a year to customers located in 48 states in the US through its TAC Energy subsidiary. Its TAC Terminals unit operates two major petroleum terminals in Arkansas (with 1.3 million barrels of capacity). Through its TAC Air unit, Truman Arnold Companies offers fixed-based operations (FBO), including aircraft fueling, hanger, and ground transportation services, through 13 general aviation facilities in the US. Truman Arnold Companies also operates two Road Runner convenience stores and has interests in real estate and ranching.

The story of CITGO Petroleum Corporation as an enduring American success story began back in 1910 when pioneer oilman, Henry L. Doherty, created the Cities Service Company.When Cities Service determined that it needed to change its marketing brand, it introduced the name CITGO in 1965, retaining the first syllable of its long-standing name and ending with "GO" to imply power, energy and progressiveness. The now familiar and enduring CITGO "trimark" logo was born. Occidental Petroleum bought Cities Service in 1982, and CITGO was incorporated as a wholly owned refining, marketing and transportation subsidiary in the spring of the following year. Then, in August, 1983, CITGO was sold to The Southland Corporation to provide an assured supply of gasoline to Southland's 7-Eleven convenience store chain.

GeoTomo develops high-end geophysical software products that help geophysicists around the world to image beneath the subsurface. Oil and gas companies use GeoTomo’s software solutions to significantly reduce the risk and cost of finding and producing hydrocarbons. Geophysical engineering companies use GeoTomo’s software products to image buried objects or near-surface layers. GeoTomo LLC services include 2D and 3D seismic and tomographic imaging and java software development used for the presentation of results. Software designers, programming engineers, and collaborating users work together to design, implement, and test the company's products.

The Company, headquartered in El Dorado, Arkansas, was originally incorporated in Louisiana in 1950 as Murphy Corporation. It was reincorporated in Delaware in 1964, at which time it adopted the name Murphy Oil Corporation. But, the Company's roots go back to a lumber and banking business in South Arkansas and, more directly, to 1907, when the first oil production was established in the Caddo Field in North Louisiana. Thereafter, oil and gas were important phases of the business. Until the mid 1930's however, oil and gas remained subordinate to timber operations and banking. Today, Murphy Oil Corporation is a worldwide oil and gas exploration and production company with refining and marketing operations in the United States and the United Kingdom. The Company's farm, timber and real estate subsidiary was spun-off to shareholders in 1996 and is now known as Deltic Timber Corporation.

Allis-Chalmers Energy provides drilling and oil field services to oil and gas exploration companies operating primarily in the western and southern US. It operates in three segments: Drilling and Completion; Oilfield Services (underbalanced drilling, directional drilling, tubular services, and production services); and Rental Services. Its Strata Directional Technology subsidiary offers drilling services to clients in Texas and Louisiana. Through its AirComp unit, Allis-Chalmers operates a fleet of 260 compressors, as well as a portfolio of full-time directional drillers, measurement-while-drilling tools, and downhole motors used for well production enhancement and completion. Allis-Chalmers Energy Inc. was founded in 1913 and is based in Houston, Texas.

IBERDROLA RENEWABLES (formerly PPM Energy) is a real power player in the energy industry. Part of IBERDROLA RENOVABLES global network, IBERDROLA RENEWABLES develops cogeneration power plants and wind farms; IBERDROLA RENEWABLES, Inc. has generating capacity of more than 3,100 MW in operation and more than 23,000 under construction or in the product pipeline, primarily in the Midwest and western US. IBERDROLA RENEWABLES also markets wholesale energy and offers risk and asset management services. The company's customers include public and private utilities, industrial companies, and other energy marketers. IBERDROLA RENEWABLES, Inc. holds the nonregulated North American operations of Scottish Power (acquired by IBERDROLA in 2007).

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.

The Nabors companies own and operate approximately 528 land drilling and approximately 763 land workover and well-servicing rigs in North America. Nabors' actively marketed offshore fleet consists of 37 platform rigs, 13 jack-up units and 3 barge rigs in the United States and multiple international markets. In addition, Nabors manufactures top drives and drilling instrumentation systems and provides comprehensive oilfield hauling, engineering, civil construction, logistics and facilities maintenance, and project management services. Nabors participates in most of the significant oil, gas and geothermal markets in the world. Nabors Drilling USA also provides well control equipment rental, equipment engineering, technical support and other rig-related services.

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