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.

Martin Midstream Partners moves petroleum products. The company gets most of its sales from the distribution of liquefied petroleum gases (LPGs). Martin Midstream buys the LPGs from natural gas processors and oil refiners and sells them to propane retailers and industrial customers. Martin Midstream also manufactures sulfur and sulfur-based fertilizer products and provides marine transportation and storage of liquid hydrocarbons. The company operates primarily in the Gulf Coast region of the US. Martin Resource Management controls a 35% stake in Martin Midstream and owns its general partner.

Pacific Rubiales Energy Corp. (formerly Petro Rubiales Energy Corp) has found a home in Colombia as a producer of heavy crude oil. The Canadian-based company is focused on the exploration, development and production of heavy crude oil in Colombia's Llanos Basin. Pacific Rubiales Energy Corp. (as Consolidated AGX Resources) had been involved in oil and gas exploration on Brazil and mineral mining exploration in Canada. In 2007 Consolidated AGX Resources completed the acquisition of Rubiales Holdings and subsequently changed its name to Petro Rubiales Energy Corp. In 2008 Pacific Rubiales Energy Corp. merged with Pacific Stratus Energy Ltd and became Pacific Rubiales Energy Corp. Pacific Rubiales Energy Corp. subsequently acquired Colombia-based Kappa Energy Holdings.

Petrolifera Petroleum makes its living from the natural resources of South America. As a crude oil and natural gas exploration and production company, Petrolifera operates on more than 8 million acres of land located in Peru, Colombia, and Argentina. Petrolifera Petroleum Limited Argentine-based operations, which constitute the company's largest source of revenue, include a 100% stake in the Puesto Morales/Rinconada Concession in the Neuquen Basin. In 2007, Petrolifera produced an average of 8,000 bbl/d (barrels per day) of crude oil and more than 2,100 mcf/d (thousand cubic feet per day) of natural gas. Petrolifera Petroleum Limited largest shareholder is oil production company Connacher Oil and Gas, which owns about 25% of the company.

Shell Global Solutions International BV was formed in 1998. Shell Global Solutions coordinates the operations of half a dozen of Royal Dutch Shell technology businesses worldwide. Shell Global Solutions International BV provides research and technical services to a range of petroleum-related industry segments including additive process industries; automotive manufacture and supply; exploration and production; chemicals; gas and LNG processing; motorsports; refining; oil marketing; and supply and distribution. Shell Global Solutions International BV services include chemical analysis, crude oil evaluation, engineering, energy optimization, gas-to-liquids conversion, gasification, hydrocracking, inspections, thermodynamics, and water treatment.

Energy Partners, Ltd. was founded in 1998 and is based in New Orleans, Louisiana.Energy Partners, Ltd. engages in the exploration and production of oil and natural gas in the United States. Energy Partners, Ltd. operates primarily in the shallow to moderate-depth waters in the Gulf of Mexico focusing on the areas offshore Louisiana, as well as the deepwater Gulf of Mexico. As of December 31, 2008, Energy Partners, Ltd. had estimated proved reserves of approximately 90.8 billion cubic feet of natural gas and 21.6 million barrels of oil.

Delek US Holdings, Inc., through its subsidiaries, engages in the refining and marketing of petroleum products in the United States. The company operates in three segments: Refining, Marketing, and Retail. The Refining segment operates an independent refinery in Tyler, Texas. This segment produces gasoline, diesel, jet fuels, liquefied petroleum gas, and natural gas liquids, as well as petrochemicals, such as propane, refinery grade propylene, and butanes; and other products, including anode grade coke, slurry oil, sulfur, and other blendstocks. The Marketing segment sells refined products on a wholesale basis in west Texas through company-owned and third party operated terminals. The Retail segment markets gasoline, diesel, and other refined petroleum products and convenience merchandise through company-operated retail fuel and convenience stores under the MAPCO Express, MAPCO Mart, Discount Food Mart, Fast Food and Fuel, East Coast, and Favorite Markets brand names. As of December 31, 2008, this segment operated a network of 482 company-operated retail fuel and convenience stores in Alabama, Arkansas, Georgia, Kentucky, Louisiana, Mississippi, Tennessee, and Virginia. Delek US Holdings serves oil companies, independent refiners and marketers, jobbers, distributors, utility and transportation companies, and independent retail fuel operators. The company was founded in 2001 and is headquartered in Brentwood, Tennessee. Delek US Holdings, Inc. is a subsidiary of Delek Group, Ltd.

Warren Resources, Inc., an independent energy company, engages in the exploration and development of onshore oil and gas reserves in the United States. Warren Resources, Inc. primarily develops coalbed methane and natural gas properties located in the Rocky Mountain region; and waterflood oil recovery programs in the Wilmington field within the Los Angeles Basin of California. As of December 31, 2009, Warren Resources owned natural gas and oil leasehold interests in approximately 160,053 gross acres; had estimated net proved reserves of 124 billion cubic feet equivalent of natural gas; and had interests in 449 gross producing wells. Warren Resources, Inc. was founded in 1990 and is based in New York, New York.

Nabors Industries Ltd. was founded in 1968 and is based in Hamilton, Bermuda. Nabors Industries Ltd. operates as a land drilling contractor worldwide. Nabors Industries Ltd. conducts oil, gas, and geothermal land drilling operations in the United States, Alaska, Canada, South America, Mexico, the Caribbean, the Middle East, the Far East, the Russian Federation, and Africa. Nabors Industries Ltd. also operates as a land well-servicing and workover contractor in the United States and Canada. In addition, Nabors Industries provides offshore platform workover and drilling rigs that offer well-servicing, workover, and drilling services. Further, Nabors Industries Ltd. offers a range of ancillary well-site services, including engineering, construction, maintenance, well logging, directional drilling, rig instrumentation, data collection, and other support services; and logistics services for onshore drilling in Canada using helicopters and fixed-winged aircraft. Additionally, Nabors Industries Ltd. manufactures and leases or sells top drives for a range of drilling applications, directional drilling systems, rig instrumentation and data collection equipment, pipeline handling equipment, and rig reporting software.

PAA Natural Gas Storage has much in store for its customers. PAA Natural Gas Storage, LLC operates and manages natural gas storage facilities in Michigan and Louisiana. PAA Natural Gas Storage, LLC assets, which together contain a storage capacity of 40 bcf (billion cubic feet), include its Bluewater facility located near Detroit and its Pine Prairie facility in Evangeline Parish. PAA Natural Gas Storage, LLC serves customers in the local gas distribution, electric power generation and utilities, pipeline, and industrial sectors and generates the bulk of its revenue from fee-based contractual services. PAA Natural Gas Storage, LLC was established by oil transporter Plains All American Pipeline (PAA) and another investor in 2005. PAA Natural Gas Storage filed an initial public offering (IPO) in 2010.

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