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ARENA RESOURCES INC (ARD)

Arena Resources, Inc. engages primarily in the acquisition, exploration, and development of oil and gas properties, as well as in the production and sale of oil and gas. The company owns interests in oil and gas properties located in Oklahoma, Texas, Kansas and New Mexico. As of December 31, 2004, the company had estimated proved reserves of approximately 21.2 million barrels of oil equivalent, as well as owned 217 net oil wells and 2 net gas wells. It had interests in 12 leases with net revenue interests ranging from 24.5% to 81.32%. The company sells its oil and natural gas production to end users, marketers, and other purchasers. Arena Resources was incorporated in 2000 and is based in Tulsa, Oklahoma.


PETROLEO BRASILEIRO S.A.- PETROBRAS (PBR)

Petroleo Brasileiro S.A. - Petrobras engages in a range of oil and gas activities. It operates in four segments: Exploration and Production (Exploration and Development); Refining, Transportation, and Marketing (Supply); Distribution; and Natural Gas and Power (Gas and Energy). The Exploration and Development segment includes exploration, development, and production activities in Brazil. The Supply segment encompasses refining, logistics, transportation, and the purchase of crude oil, as well as the purchase and sale of oil products and fuel alcohol. It also includes the petrochemical and fertilizers division, which includes investments in domestic petrochemical companies and the company's two domestic fertilizer plants. The Distribution segment encompasses oil product and fuel alcohol distribution activities conducted by the company's majority owned subsidiary, Petrobras Distribuidora S.A. - BR in Brazil. The Gas and Energy segment encompasses the purchase, sale, and transportation of natural gas produced in or imported into Brazil. This segment also includes domestic electric energy commercialization activities, as well as investments in domestic natural gas transportation companies, state owned natural gas distributors, and thermal electric companies. The company distributes its oil products to various wholesale customers and retail distributors in Brazil. Petroleo Brasileiro was founded in 1953 and is based in Rio de Janeiro, Brazil.


CANO PETROLEUM INC (CFW)

Cano Petroleum, Inc., an independent crude oil and natural gas production company, engages in the acquisition, development, operation, and exploration of oil and natural gas properties. The company focuses on acquiring undervalued properties, located primarily in Texas, Oklahoma, Kansas, Illinois, and other midcontinent regions of the United States. Its properties include Davenport Unit property that is located in Lincoln County, Oklahoma covering approximately 2,178 acres; Rich Valley area that spans 4,500 acres; and Nowata Field property, which is located in Nowata County, Oklahoma, consists of 4,500 acres and 228 producing oil wells. As of June 30, 2004, the company had estimated total proved crude oil reserves of 213,245 barrels, of which 12,608 barrels were proved producing reserves. The company was founded in 1997 as Huron Ventures, Inc. and changed its name to Cano Petroleum, Inc. in June 2004. Cano Petroleum is headquartered in Fort Worth, Texas.


NATCO GROUP INC (NTG)

NATCO Group, Inc. provides wellhead equipment, systems, and services used in the production of oil and gas. It offers a range of production equipment, including separators that separates hydrocarbon stream into oil, water, and gas; heaters, which prevent hydrates from forming in gas streams and reduce the viscosity of oil; oil dehydration equipment that removes water from oil; gas conditioning equipment, which removes contaminants from hydrocarbon and gas streams; and gas processing equipment for the extraction of liquid hydrocarbons to meet feed gas and liquid product requirements. The company provides gas-processing facilities, which removes carbon dioxide from hydrocarbon streams; and a line of water treatment and conditioning equipment that removes contaminants from water extracted during oil and gas production. It also designs, engineers, and manufactures engineered systems, such as integrated oil and gas processing trains, gas processing facilities, floating production systems, dehydration and desalting systems, water injection systems, produced water cleanup systems, and other equipment. In addition, NATCO Group offers pneumatic, hydraulic, electrical, and computerized control panels and systems; engineering and field services; and supervisory control and data acquisition systems. Its production equipment is primarily used in onshore and offshore fields in various oil and gas producing regions worldwide. The company was incorporated in 1988 and is headquartered in Houston, Texas.


ATWOOD OCEANICS INC (ATW)

Atwood Oceanics, Inc., together with its subsidiaries, engages in the international offshore drilling and completion of exploratory and developmental oil and gas wells. It offers various support, management, and consulting services. Atwood Oceanics provides semisubmersible rigs, semisubmersible tender assist rigs, jack-up rigs, submersible drilling rigs, and modular platform rigs. The company offers various services to third party owners of drilling rigs, such as the supply of personnel and rig design, fabrication, installation, and operation. It operates in offshore Southeast Asia, offshore Australia, the Mediterranean Sea, and the U.S. Gulf of Mexico. As of September 30, 2005, the company owned and operated a fleet of seven offshore mobile drilling units, one jack-up rig, and two self-contained platform rigs. Atwood Oceanics was founded in 1968 and is headquartered in Houston, Texas.


CANADIAN SUPERIOR ENERGY INC (SNG)

Canadian Superior Energy, Inc. engages in the exploration and production of crude oil and natural gas in western Canada, offshore Nova Scotia, and offshore Trinidad and Tobago. It holds interests in Intrepid Block and Tradewinds prospects in Trinidad and Tobago; interests in 6 exploration licenses in east coast and offshore Nova Scotia; and working interests in Alberta, British Columbia, and Saskatchewan properties. As of December 31, 2004, the company had proved reserves of 17,097 million cubic feet of natural gas and 136 thousand barrels of natural gas liquids. Canadian Superior Energy was incorporated in March 1983 as 297272 Alberta, Ltd. and changed its name to Kapalua Gold Mines, Ltd in April 1993. Further, it changed its name to Prize Energy, Inc. in November 1993 and subsequently to Canadian Superior Energy, Inc. in August 2000. The company is headquartered in Calgary, Canada.


ATLAS AMERICA INC (ATLS)

Atlas America, Inc. engages in the development, production, and transportation of natural gas and oil in western New York, eastern Ohio, western Pennsylvania, and Tennessee. The company, through its wholly owned subsidiary, transports natural gas from it wells to interstate pipelines and end users, as well as operates a natural gas processing facility. As of September 30, 2005, the company had proved reserves of 171.6 billion cubic feet of natural gas equivalents. As of September 30, 2004, it had interests in 6379 gross wells. The company was incorporated in 2000 and is headquartered in Moon Township, Pennsylvania.


DIAMOND OFFSHORE DRILLING INC (DO)

Diamond Offshore Drilling, Inc., through its wholly owned subsidiaries, engages in contract drilling of offshore oil and gas wells worldwide. It also engages in deep water drilling services. As of August 10, 2005, its fleet consisted of 44 offshore drilling rigs, including 29 semisubmersibles, 14 jack-ups, and 1 drillship. The company serves the deep water, harsh environment, conventional semisubmersible, and jack-up markets. Its customers include independent oil and gas companies, and government-owned oil companies. The company has operations in United States, Europe, South America, Africa, Mexico, Australia, and Southeast Asia. The company was incorporated in 1989 and is headquartered in Houston, Texas. Diamond Offshore Drilling, Inc. is a subsidiary of Loews Corporation.


ATLAS PIPELINE HOLDINGS L.P (AHD)

Atlas Pipeline Holdings L.P., through its interests in Atlas Pipeline Partners, L.P, engages in the transmission, gathering, and processing of natural gas in the Mid-Continent and Appalachian regions. It owns and operates a 565-mile interstate pipeline system that extends from southeastern Oklahoma through Arkansas and into southeastern Missouri, and has throughput capacity of approximately 322 million cubic feet per day (MMcfd); and 3 natural gas processing plants with aggregate capacity of approximately 350 MMcfd and a treating facility with a capacity of approximately 200 MMcfd located in Oklahoma. The company also owns 1,900 miles of active natural gas gathering systems located in Oklahoma, Arkansas, northern Texas, and the Texas panhandle, which transport gas from wells and central delivery points in the Mid-Continent region to its natural gas processing plants or Ozark Gas Transmission. In addition, Atlas Pipeline Holdings owns and operates 1,600 miles of active natural gas gathering systems located in eastern Ohio, western New York, and western Pennsylvania. Further, it produces and sells natural gas liquids. The company was founded in 2000 and is based in Moon Township, Pennsylvania.


EV ENERGY PARTNERS L.P (EVEP)

EV Energy Partners, L.P. engages in the acquisition, production, and development of oil and gas properties. It holds interests in various properties located in the Appalachian basin, primarily in Ohio and West Virginia; the Monroe Field properties situated in three parishes in northeast Louisiana; the Mid-Continent area properties located in six counties in western Oklahoma, three counties in Texas, and two parishes in North Louisiana; and other natural gas properties in Michigan, and central and east Texas. The company offers its products primarily to marketing companies and industrial users. As of December 31, 2006, EV Energy Partners had estimated net proved reserves of 2 million barrels of oil and 49.4 billion cubic feet of natural gas. It also had interests in 31 net oil producing wells and 1,809 net natural gas producing wells. EV Energy GP, L.P. serves as the general partner of the company. EV Energy Partners was founded in 2006 and is based in Houston, Texas.


TRANSOCEAN INC (RIG)

Transocean, Inc. provides offshore contract drilling services for oil and gas wells. It contracts drilling rigs and related equipment, and work crews to drill oil and gas wells. The company also provides integrated services. It operates through two segments, Transocean Drilling and TODCO. The Transocean Drilling segment consists of floaters, jackups, and other rigs used in support of offshore drilling activities and offshore support services. The TODCO segment consisted of its interest in TODCO, which conducts jackup, drilling barge, land rig, submersible, and other operations in the U.S. Gulf of Mexico and inland waters, Mexico, Trinidad, and Venezuela. As of December 31, 2004, the company owned and operated 93 mobile offshore and barge drilling units, 32 semisubmersibles and drillships, 24 Other Floaters, 26 Jackup Rigs, and 11 Other Rigs. It serves the offshore drilling markets in the United States, Gulf of Mexico, eastern Canada, Brazil, Trinidad, the United Kingdom North Sea, Norwegian North Sea, Caspian Sea, Middle East, India, West Africa, South Africa, Southeast Asia, and Australia. Transocean is based in Houston, Texas.


BILL BARRETT CORPORATION (BBG)

Bill Barrett Corporation engages in the acquisition, exploration, development, and production of natural gas and crude oil in the Rocky Mountain region of the United States. It operates primarily in nine basins, including the Piceance Basin in northwestern Colorado; the Wind River Basin in central Wyoming; the Uinta Basin in northeastern Utah; the Powder River Basin in northeastern Wyoming; the Williston Basin in western North Dakota, northwestern South Dakota, and eastern Montana; the Green River Basin in southwestern Wyoming and adjacent areas of northeastern Utah; Denver-Julesburg Basin, which extends into Colorado, Kansas, and Nebraska; the Paradox Basin in southwestern Colorado and southeastern Utah; and The Big Horn Basin in north central Wyoming. As of December 31, 2004, the company had 257.8 billion cubic feet of proved natural gas reserves and 5.7 Million barrels of proved crude oil reserves. Bill Barrett was formed in 2002 and is headquartered in Denver, Colorado.


BOIS DARC ENERGY INC (BDE)

Bois d'Arc Energy, Inc., an exploration company, engages in the discovery and production of oil and natural gas in the Gulf of Mexico. As of December 31, 2004, it had proved reserves of 305.3 billion cubic feet of natural gas equivalent, as well as owned interests in 104 producing oil and natural gas wells in the federal and state waters of the Gulf of Mexico. The company was formerly known as Bois d'Arc Energy, LLC and changed its name to Bois d'Arc Energy, Inc. in May 2005. Bois d'Arc Energy is headquartered in Houston, Texas. Bois d'Arc Energy, Inc. is a majority owned subsidiary of Comstock Offshore LLC.


CHENIERE ENERGY INC (LNG)

Cheniere Energy, Inc. primarily engages in the development, construction, ownership, and operation of liquefied natural gas receiving terminals along the Gulf Coast of the United States. It develops LNG receiving terminal projects primarily on Quintana Island near Freeport, Texas; in Cameron Parish, Louisiana near Sabine Pass; near Corpus Christi, Texas; and at the mouth of the Calcasieu Channel in Cameron Parish, Louisiana. The company also engaged in oil and natural gas exploration and development activities in the Gulf of Mexico using a regional database of 7,000 square miles of prestack time migration 3D seismic data. Cheniere Energy was founded in 1983 and is based in Houston, Texas.


BREITBURN ENERGY PARTNERS L.P (BBEP)

Breitburn Energy Partners L.P. operates as an oil and gas partnership. The partnership, through its wholly owned subsidiary, BreitBurn Operating L.P. and its general partner BreitBurn Operating GP, LLC, engages in the acquisition, exploitation, and development of oil and gas properties in the United States. Its assets primarily consist of producing and non-producing crude oil reserves located in the Los Angeles Basin in California, the Wind River and Big Horn Basins in central Wyoming, and the Permian Basin in west Texas. Breitburn Energy also owns oil properties along the Sunniland Trend in Florida. As of December 31, 2006, the partnerships' total estimated proved reserves were 30.7 million barrels of oil equivalent. BreitBurn GP, LLC operates as the general partner to the partnership. Breitburn Energy is based in Los Angeles, California.


CONSTELLATION ENERGY PRTNR L (CEP)

Constellation Energy Partners LLC engages in the acquisition, development, and production of oil and natural gas properties, as well as related midstream assets in the United States. It owns working interests in Robinson's Bend Field located in the Black Warrior Basin in Alabama and in the Cherokee Basin of Oklahoma and Kansas. As of December 31, 2006, Constellation Energy Partners had approximately 120.3 Bcf of estimated proved natural gas reserves; and 467 producing natural gas wells in Robinson's Bend Field. The company, formerly known as CBM Equity IV Holdings, LLC, was founded in 2002. It changed its name to Constellation Energy Resources LLC in May 2006 and to Constellation Energy Partners LLC in July 2006. The company is headquartered in Baltimore, Maryland. Constellation Energy Partners LLC is a subsidiary of Constellation Energy Commodities Group, Inc.


NOBLE CORPORATION (NE)

Noble Corporation provides various services for the oil and gas industry. It provides offshore contract drilling, engineering, and consulting services. The company offers contract drilling services through a fleet of 60 mobile offshore drilling units in the Middle East, U.S. Gulf of Mexico, Mexico, the North Sea, Brazil, West Africa, India, and the Mediterranean Sea. Noble Corporation's engineering and consulting services include provision of drilling products and drilling-related software programs, well site management, project management, and technical services. In addition, it provides labor contract drilling services. As of July 18, 2005, the company's fleet consisted of 13 semisubmersibles, 3 dynamically positioned drillships, 41 jackups, and 3 submersibles. Noble Corporation is based in Sugar Land, Texas.


GULF ISLAND FABRICATION INC (GIFI)

Gulf Island Fabrication, Inc. engages in the fabrication and refurbishment of drilling and production platforms, and other specialized structures used in the development and production of offshore oil and gas reserves. The structures and equipment fabricated by the company include jackets and deck sections of fixed production platforms; hull and/or deck sections of floating production platforms, such as tension leg platforms, SPARs, and floating production storage and offloading vessels; piles; wellhead protectors; subsea templates; production, compressor, and utility modules; and offshore living quarters. It also provides offshore interconnect pipe hook-up, inshore marine construction, manufacture and repair of pressure vessels, and steel warehousing. The company principally operates in the offshore regions of the Gulf of Mexico. Its customers include oil and gas exploration and production companies. Gulf Island was co-founded by Alden J. Laborde and Huey J. Wilson in 1985. The company is headquartered in Houma, Louisiana.


STATOIL ASA (STO)

Statoil ASA engages in the exploration, production, transportation, refining, and marketing of petroleum and petroleum-derived products. The company operates through four segments: Exploration and Production Norway, International Exploration and Production, Natural Gas, and Manufacturing and Marketing. The Exploration and Production Norway segment includes exploration, development, and production operations on the Norwegian Continental Shelf (NCS), which produces hydrocarbons. The International Exploration and Production segment includes exploration, development, and production operations outside Norway. Its main producing areas include Caspian (Azerbaijan), North Africa (Algeria), Venezuela, and western Europe, as well as western Africa, comprising Angola along with Nigeria. The Natural Gas segment transports, processes, and sells natural gas from its upstream positions on the NCS and certain assets abroad. The Manufacturing and Marketing segment comprises downstream activities, including sales and trading of crude oil, natural gas liquid, and petroleum products, refining, methanol production, retail and industrial marketing of oil products, and petrochemical operations through its 50 per cent owned joint venture Borealis. As of December 31, 2004, its proved reserves consisted of 1,720 million barrels of oil and 408 billion cubic meters of natural gas, which represents an aggregate of 4,289 million barrels-of-oil equivalent. The company was founded in 1972. It was incorporated in 1972 under the name Den norske stats oljeselskap a.s. and changed its name to Statoil ASA in 2001. Statoil is headquartered in Stavanger, Norway.


HELMERICH & PAYNE INC (HP)

Helmerich & Payne, Inc. engages in the contract drilling of oil and gas wells for others in North and South America. The company provides drilling rigs, equipment, personnel, and camps on a contract basis to enable its customers to explore for and develop oil and gas from onshore areas, as well as from fixed platforms, tension-leg platforms, and spars in offshore areas. It also engages in the ownership, development, and operation of commercial real estate in Tulsa, Oklahoma. The company owns and leases a shopping center and multitenant warehouse space to third parties. Helmerich & Payne was founded in 1920 and is based in Tulsa, Oklahoma.


IVANHOE ENERGY INC (IVAN)

No description available.


PRIDE INTERNATIONAL INC (PDE)

Pride International, Inc. provides onshore and offshore contract drilling and related services to oil and gas companies, as well as to independent oil and gas producers. It provides rigs and drilling crews, as well as cementing, stimulation, carbon dioxide, coiled tubing, and production services. The company also manages integrated services projects in Argentina and other South American countries. Further, Pride International offers various rig management services comprising technical drilling assistance, personnel, repair and maintenance services, and drilling operation management services. As of March 1, 2005, the company operated a fleet of 290 rigs that comprised 2 ultra-deepwater drillships; 12 semisubmersible rigs; 29 jackup rigs; 20 tender-assisted, barge, and platform rigs; and 227 land-based drilling and workover rigs. Its operations are conducted in the oil and gas basins worldwide, including South America, the Gulf of Mexico, the Mediterranean, West Africa, the Middle East, Asia Pacific, Russia, and Kazakhstan. The company is headquartered in Houston, Texas.


WESTSIDE ENERGY CORPORATION (WHT)

Westside Energy Corporation operates as an oil and gas company in the United States. It primarily focuses on the acquisition, exploration, and development of natural gas and oil in the Barnett Shale play in north Texas. Westside Energy sells its oil and gas products primarily to domestic pipelines and refineries. The company was incorporated in 1995. It was formerly known as Eventemp Corporation and changed its name to Westside Energy Corporation in 2004. Westside Energy is based in Houston, Texas.


CNX GAS CORPORATION (CXG)

CNX Gas Corporation engages in the exploration, development, and production of natural gas primarily in the Appalachian Basin, the United States. It produces coalbed methane (CBM), which is a gas that resides in coal seams. The company holds rights associated with CBM for 4.5 billion tons of proved coal reserves in northern Appalachia, central Appalachia, the Illinois Basin, and other western basins. It has the right to extract CBM from approximately 290,000 net CBM acres in central Appalachia; and from approximately 523,000 net CBM acres in northern Appalachia. As of December 31, 2006, the company had 1.265 trillion cubic feet equivalent of net proved reserves. The company also controlled approximately 70,000 acres of oil and gas rights, which include the rights to gas in the New Albany Shale in western Kentucky and southern Illinois, as of the above date. In addition, it controls 33,000 additional oil and gas acres, and 92,000 net CBM acres in Illinois Basin. Further, CNX Gas, through a joint venture with Allegheny Energy, owns a 50% interest in an 88-megawatt gas-fired electric generating facility in Virginia. Additionally, it owns or leases various processing plants that remove impurities from certain types of CBM gas in order to meet interstate pipeline standards. The company is headquartered in Pittsburgh, Pennsylvania. CNX Gas Corporation is a subsidiary of CONSOL Energy, Inc.


MARINER ENERGY INC (ME)

Mariner Energy, Inc. operates as an independent oil and gas exploration, development, and production company in West Texas and the Gulf of Mexico. In West Texas, it operates in the prolific Spraberry, Dean, and Wolfcamp trends in the Permian Basin. In shallow water of the Gulf of Mexico, the company conducts operations in water depths up to 1,300 feet and operates projects at subsurface depths up to 20,000 total vertical feet. As of December 31, 2006, Mariner Energy had estimated proved reserves of 715.5 billion cubic feet equivalent, including 426.7 billion cubic feet of natural gas and 48.1 million barrels of oil. It also owned an interest in 1,121 gross productive oil and gas wells, including 864 gross productive oil wells and 257 gross productive gas wells. The company was incorporated in 1983 and is headquartered in Houston, Texas.


WHITING PETROLEUM CORPORATION (WLL)

Whiting Petroleum Corporation, through its subsidiary, Whiting Oil and Gas Corporation, engages in the exploitation, acquisition, exploration, and production of oil and natural gas properties primarily in the Gulf Coast/Permian Basin, Rocky Mountains, Michigan, and mid-continent and California regions of the United States. The company sells oil and natural gas to the end users, marketers, and other purchasers that have access to nearby pipeline facilities. As of January 1, 2005, the company's estimated proved reserves totaled 865.4 billion cubic feet equivalent. The company was founded in 1983. It was formerly known as Whiting Petroleum Holdings, Inc. and changed its name to Whiting Petroleum Corporation in 2003. Whiting Petroleum is headquartered in Denver, Colorado.


ATLAS ENERGY RESOURCES LLC (ATN)

Atlas Energy Resources, LLC, together with its subsidiaries, engages in the development and production of natural gas and oil principally in northern Michigan and the Appalachian Basin covering western New York, western Pennsylvania, eastern Ohio, and Tennessee. The company owns interests in approximately 9,950 gross wells, of which the company operated approximately 8,240 wells; and an interest in a joint venture that gives right to drill approximately 212,000 acres in Tennessee. As of December 31, 2006, it had proved reserves of approximately 180.9 billion cubic feet of natural gas equivalents. Atlas Energy Resources also involves in the well construction and completion, administration and oversight, well services, and gathering operations. The company is based in Moon Township, Pennsylvania.


HILAND HOLDINGS GP LP (HPGP)

Hiland Holdings GP, LP, through its subsidiaries, engages in gathering, compressing, dehydrating, treating, processing, and marketing natural gas; fractionating natural gas liquids; and providing air compression and water injection services for oil and gas secondary recovery operations in mid-continent and rocky mountain regions of the United States. As of December 31, 2006, the company had 13 natural gas gathering systems with approximately 1,844 miles of gas gathering pipelines, 5 natural gas processing plants, 3 natural gas treating facilities, and 3 NGL fractionation facilities, as well as 2 air compression facilities and a water injection plant. Hiland Partners GP Holdings, LLC serves as the general partner of Hiland Holdings GP, LP. The company was founded in 1990 and is based in Enid, Oklahoma.


ROWAN COMPANIES INC (RDC)

Rowan Companies, Inc. provides international and domestic contract drilling services in the Gulf of Mexico, the North Sea, offshore eastern Canada; and in Texas and Louisiana. The company's Drilling Operations include offshore and onshore drilling operations. As of March 14, 2005, its offshore drilling fleet consist of 17 cantilever jack-up rigs, including 3 Gorilla class rigs, 4 Super Gorilla class rigs and 1 Tarzan Class rig; 7 conventional jack-up rigs, including 5 rigs with skid base capability; and 1 semisubmersible rig. Its onshore operations include drilling equipment, personnel, and camps available on a contract basis for exploration and development of onshore areas. As of the above date, the onshore operations own 18 deep-well land rigs. The company, through its subsidiary, LeTourneau, Inc., operates a mini steel mill, which produces heavy equipment for the mining and timber industries; and drilling products group that designs mobile offshore jack-up drilling rigs. Rowan markets its products to international energy companies, smaller energy companies, and foreign government-owned or controlled energy companies. The company was founded in 1923 and is headquartered in Houston, Texas.


ENSCO INTERNATIONAL INCORPORATED (ESV)

ENSCO International Incorporated provides offshore drilling services to the oil and gas industry worldwide. It operated a fleet of 54 drilling rigs, including 43 jackup rigs, 7 barge rigs, 3 platform rigs, and 1 semisubmersible rig, as of February 15, 2005. Its customer base includes international, government-owned, and independent oil and gas companies. The company operates in North America; Europe/Africa; Asia Pacific, including Asia, the Middle East, and Australia; and South America/Caribbean. ENSCO International was formed as a Texas corporation in 1975 and is headquartered in Dallas, Texas.


VENOCO INC (VQ)

Venoco, Inc., an independent energy company, engages in the acquisition, exploration, exploitation, and development of oil and natural gas properties in California and Texas. Its principal properties are located offshore southern California, onshore in California's Sacramento Basin, and onshore along the Gulf Coast of Texas. The company's properties include South Ellwood Field, Santa Clara Federal Unit, and Dos Cuadras Field in offshore California; Willows and Greater Grimes Fields in Sacramento Basin; Beverly Hills West Field and Santa Clara Avenue Field in coastal California onshore; and Hastings Complex and Constitution Field in Texas. As of December 31, 2006, its total proved reserves included 87,932 MBOE, which comprised of 49,607 thousand barrels of oil and 229,952 million cubic feet of natural gas. The company was founded in 1992 and is based in Denver, Colorado.


MARKWEST ENERGY PARTNERS LP (MWE)

MarkWest Energy Partners, L.P. engages in the gathering, processing, and transmission of natural gas; the transportation, fractionation, and storage of natural gas liquids (NGL); and the gathering and transportation of crude oil. The company operates in the northeastern and southwest United States. Its general partner is MarkWest Energy, GP, L.L.C. The company was founded in 1988 and is based in Englewood, Colorado.


UNION DRILLING INC (UDRL)

Union Drilling, Inc. provides contract land drilling services and equipment primarily to natural gas producers in the United States. Its principal operations are located in the Appalachian Basin, extending from New York to Tennessee; the Arkoma Basin in eastern Oklahoma and Arkansas, including the Fayetteville Shale; and the Fort Worth Basin in northern Texas. The company's rigs operate in unconventional natural gas producing areas, where specialized drilling techniques are required to develop unconventional natural gas resources. In addition, it provides the drilling crews and the ancillary equipment to operate its drilling rigs. As of March 12, 2007, Union Drilling owned 76 rigs. The company was founded in 1997 and is headquartered in Fort Worth, Texas.


TRI-VALLEY CORPORATION (TIV)

Tri-Valley Corporation, through its subsidiaries, engages in the exploration, acquisition, development, and production of petroleum and precious metal properties in northern California. It operates in California, Nevada, and Alaska. As of December 31, 2004, the company had proved reserves of 162 bbl of oil and 742,401 mcf of natural gas. Tri-Valley was formed in 1971 and is based in Bakersfield, California.


PENGROWTH ENERGY TRUST (PGH)

Pengrowth Energy Trust, a closed-end investment trust, engages in acquiring and holding royalty units and notes issued by Pengrowth Corporation, its subsidiary. Pengrowth Corporation owns oil and natural gas properties in Canada. As of December 31, 2004, its total proved plus probable reserves were 218,613 thousands of barrels of oil equivalent. As of the above date, Pengrowth had an interest in 5,417 gross (1,990 net) producing oil and natural gas wells and 1,194 gross (679 net) inactive wells in Alberta, British Columbia, Saskatchewan, and Nova Scotia. Pengrowth Management Limited serves as the manager of the trust. The company, formerly Pengrowth Gas Income Fund, was established in 1988 and changed its name to Pengrowth Energy Trust in 1996. Pengrowth Energy trust is headquartered in Calgary, Canada.


QUEST RESOURCE CORPORATION (QRCP)

Quest Resource Corporation, through its subsidiaries, engages in the exploration, development, production, and transportation of natural gas. It primarily focuses on the development of coal bed methane in southeastern Kansas and northeastern Oklahoma, known as the Cherokee Basin. As of December 31, 2006, the company had net proved reserves of 198 billion cubic feet equivalent of natural gas, as well as operated approximately 1,650 gas and oil producing wells. Quest Resource Corporation also owned and operated a gas gathering pipeline network of approximately 1,600 miles. The company was founded in 1982 and is headquartered in Oklahoma City, Oklahoma.


UNIT CORPORATION (UNT)

Unit Corporation, through its subsidiaries, engages in exploration and production of oil and gas. It also offers contract drilling and natural gas gathering and processing services. The company operates in three segments: Contract Drilling, Oil and Natural Gas Exploration and Production, and Gas Gathering and Processing. The Contract Drilling segment engages in the land contract drilling of oil and natural gas wells. The Oil and Natural Gas Exploration and Production segment develops, acquires, and produces oil and natural gas properties. The Gas Gathering and Processing segment purchases, gathers, processes, and treats natural gas. As of December 31, 2004, the company had 8,561 Mbbls of oil reserves and 295,406 MMcf of natural gas reserves. The company was founded in 1963 and is based in Tulsa, Oklahoma.


HILAND PARTNERS LP (HLND)

Hiland Partners, LP engages in gathering, compressing, dehydrating, treating, processing, and marketing natural gas, as well as fractionating natural gas liquids (NGL). It also provides air compression and water injection services for oil and gas secondary recovery operations. The company's midstream assets consist of seven natural gas gathering systems with approximately 865 miles of gathering pipelines, four natural gas processing plants, three natural gas treating facilities, and two NGL fractionation facilities. Its compression assets consist of two air compression facilities and a water injection plant. The company operates primarily in the Mid-Continent and Rocky Mountain regions of the United States. Hiland Partners GP, LLC serves as the general partner of the company. Hiland Partners is based in Enid, Oklahoma.


ENERPLUS RESOURCES FUND (ERF)

Enerplus Resources Fund, an energy investment trust, holds a portfolio of crude oil and natural gas assets in western Canada. The fund holds securities of various direct and indirect operating subsidiaries, and royalties on the crude oil and natural gas property interests. Its oil and natural gas property interests are located in the provinces of British Columbia, Alberta, Saskatchewan, and Manitoba. As of December 31, 2004, the oil and natural gas property interests held by Enerplus were estimated to contain proved plus probable reserves of 195 million barrels of crude oil and natural gas liquids, and 1,267 billion cubic feet of natural gas for a total of 406.2 million barrels of oil equivalent. As of the above date, the company had 2,069 net oil wells and 2,981 net natural gas wells. Enerplus was established in 1986 and is headquartered in Calgary, Canada.


TETON ENERGY CORPORATION (TEC)

Teton Energy Corporation, together with its subsidiaries, engages in the development, production, and marketing of natural gas and oil properties in North America. It owns a 25% membership interest in various oil and gas rights and leasehold assets covering approximately 6,314 gross acres in the Piceance Basin in Western Colorado; 266,572 gross acres in the DJ Basin located in Nebraska; and a 25% working interest in 87,192 gross acres in the Williston Basin situated in Williams County, North Dakota. The company, formerly known as Teton Petroleum Company, was founded in 1962 and is based in Denver, Colorado.


PARKER DRILLING COMPANY (PKD)

Parker Drilling Company, through its subsidiaries, provides contract drilling and drilling-related services worldwide. The company offers land and offshore contract drilling services and rental tools to oil and gas companies, and integrated service providers. Its land drilling operations are focused primarily in the Commonwealth of Independent States, Asia Pacific region, and Latin America, including Mexico. The company focuses its offshore drilling operations on the transition zones, which are coastal waters that include lakes, bays, rivers, and marshes of Nigeria, the Caspian Sea, and the Gulf of Mexico. Parker Drilling Company provides rental tools, including drill pipe, drill collars, tubing, high and low-pressure blowout preventers, choke manifolds, casing scrapers, and junk and cement mills used for land and offshore oil and gas drilling, and workover activities. In addition, the company provides a range of ancillary services, including management and provision of labor resources for drilling rigs owned by third parties, engineering, and logistics. As of December 31, 2004, its marketable rig fleet consisted of 23 barge drilling and workover rigs, and 34 land rigs. Parker Drilling Company was founded by Gifford C. Parker in 1934. The company is headquartered in Houston, Texas.


PATTERSON-UTI ENERGY INC (PTEN)

Patterson-UTI Energy, Inc. and its wholly owned subsidiaries provide onshore contract drilling services to independent oil and natural gas exploration, and production companies in North America. The company provides pressure pumping services to oil and natural gas companies primarily in the Appalachian Basin. It also offers drilling fluids, completion fluids, and related services to oil and natural gas operators in west Texas, southeast New Mexico, south Texas, east Texas, Oklahoma, the Gulf coast regions of Texas and Louisiana, and the Gulf of Mexico. As of December 31, 2004, Patterson-UTI owned 361 land-based drilling rigs. The company also engages in the development, exploration, acquisition, and production of oil and natural gas in west Texas, southeast New Mexico, south Texas, and Mississippi. Patterson-UTI was formed in 1978 and is headquartered in Snyder, Texas.


NABORS INDUSTRIES INC (NBR)

Nabors Industries, Ltd. operates as a land drilling contractor worldwide. The company conducts oil, gas, and geothermal land drilling operations in the United States, Canada, South and central America, the Middle East, the Far East, and Africa. It also serves as a land well-servicing and workover contractor in the United States and Canada. In addition, Nabors Industries also provides offshore platform workover and drilling rigs. These rigs provide well-servicing, workover, and drilling services. The company offers a range of ancillary well-site services, including engineering, transportation, construction, maintenance, well logging, directional drilling, rig instrumentation, data collection, and other support services in selected domestic and international markets. It charters a fleet of 33 marine transportation and supply vessels, which provide transportation of drilling materials, supplies, and crews for offshore operations. In addition, Nabors Industries manufactures and leases or sells drives for a range of drilling applications, directional drilling systems, rig instrumentation and data collection equipment, and rig reporting software. The company also makes investments in oil and gas exploration, development, and production activities. As of December 31, 2004, it owned approximately 600 land drilling rigs and 915 land workover and well-servicing rigs, as well as 43 platform and 19 jack-up units, and 3 barge rigs. Nabors Industries is based in St. Michael, Barbados.


DUNE ENERGY INC (DNE)

Dune Energy, Inc., an oil and gas exploration and production company, engages in the exploration, development, and acquisition of natural gas and crude oil properties. Its operations are concentrated along the Louisiana/Texas Gulf Coast, as well as the Fort Worth Basin Barnett Shale. Dune Energy has a participation agreement with American Natural Energy Corp. to acquire exclusive exploration and development rights in American Natural Energy's Joint Development Agreement with ExxonMobil Corp. covering approximately 11,000 contiguous acres in the Bayou Couba Field, located in St. Charles Parish, Louisiana. The company has working interests in wells located in various areas of Texas, including the Welder Ranch located in Victoria County; the Pearsall Field in Frio County; the Barnett Shale play in the North Texas Fort Worth Basin; and the Los Mogotes Field in Zapata County. The company was formed in 1998. It was formerly known as IP Factory, Inc. and changed its name to Dune Energy, Inc. in 2003. Dune Energy is headquartered in Houston, Texas.


LEGACY RESERVES LP (LGCY)

Legacy Reserves LP, an independent oil and natural gas limited partnership, engages in the acquisition and exploitation of oil and natural gas properties primarily located in the Permian Basin of West Texas and southeast New Mexico. As of December 31, 2006, the company's estimated proved reserves were approximately 18.8 million barrels of crude oil equivalent, including 13.4 million barrels of crude oil or other liquid hydrocarbons and 32.5 billion cubic feet of natural gas. It also owned working interests in approximately 1,823 gross productive oil wells and 128 gross productive natural gas wells. Legacy Reserves GP, LLC serves as the general partner of the partnership. The company, formerly known as the Moriah Group, was founded in 1992 and is headquartered in Midland, Texas.


NGAS RESOURCES INC (NGAS)

NGAS Resources, Inc. engages in the development and production of natural gas in Appalachian basin, eastern Kentucky. As of December 31, 2004, the company had 64,297,519 mcf of proved natural gas reserves and 296,128 bbl of crude oil reserves. Its customers include gas marketing intermediaries, pipelines, and transmission companies. NGAS Resources was founded in 1979. It was formerly known as Daugherty Resources, Inc. and changed its name to NGAS Resources, Inc. in 2004. The company is headquartered in Lexington, Kentucky.


GREY WOLF INC (GW)

Grey Wolf, Inc., through its subsidiaries, provides onshore contract drilling services to the oil and gas industry in the United States. The company conducts its operations primarily in drilling markets of Ark-La-Tex, Gulf Coast, Mississippi/Alabama, south Texas, west Texas, and Rocky Mountain. Its rig fleet consists of mechanical and diesel electric drilling rigs. Grey Wolf also utilizes top drives in its drilling operations. The company operates primarily in Alabama, Arkansas, Colorado, Louisiana, Mississippi, New Mexico, Oklahoma, Texas, and Wyoming. As of April 27, 2005, it had a total drilling rig fleet of 127 rigs. Grey Wolf offers its drilling services to independent producers, as well as to oil and gas companies. The company was founded in 1978 and is headquartered in Houston, Texas.


COMPTON PETROLEUM CORP (CMZ)

Compton Petroleum Corporation engages in the exploration, development, and production of natural gas, natural gas liquids, and crude oil in the Western Canadian Sedimentary Basin. The company holds interests in various properties located in southern Alberta targeting the plains Belly River, Edmonton Horseshoe Canyon coalbed methane, Hooker Basal quartz, and thrusted, foothills Belly River at Callum; and in central Alberta targeting the Gething/Rock Creek at Niton. It sells crude oil and natural gas liquids primarily to refineries and marketers of crude oil and natural gas liquids. As of December 31, 2006, Compton Petroleum had total proved plus probable reserves of 249 million barrels of oil equivalent. The company was founded in 1992 and is headquartered in Calgary, Canada.


PIONEER DRILLING CO (PDC)

Pioneer Drilling Company, through its principal subsidiary, Pioneer Drilling Services, Ltd., provides contract land drilling services to oil and gas exploration and production companies primarily in Texas, western Oklahoma, and the Rocky Mountains. The company undertakes day work, turnkey, and footage contracts. In addition to its drilling rigs, Pioneer Drilling provides the drilling crews and the ancillary equipment needed to operate its drilling rigs. Its land drilling rig consists of engines, a hoisting system, a rotating system, pumps, and related equipment to circulate drilling fluid, blowout preventers, and related equipment. As of June 30, 2005, its rig fleet consisted of 50 drilling rigs. The company was incorporated in 1979 as the successor to a business founded in 1968. Pioneer Drilling is headquartered in San Antonio, Texas.


BRONCO DRILLING COMPANY INC (BRNC)

Bronco Drilling Company, Inc. provides contract land drilling services to oil and natural gas exploration and production companies in the United States. As of February 28, 2007, the company owned a fleet of 65 land drilling rigs primarily in Oklahoma, Kansas, Texas, Colorado, and North Dakota. It also owned a fleet of 67 trucks used to transport its rigs. Bronco Drilling Company was founded in 2001 and is headquartered in Edmond, Oklahoma.


HERCULES OFFSHORE INC (HERO)

Hercules Offshore, Inc. and subsidiaries provide shallow-water drilling and liftboat services to the oil and natural gas exploration and production industry in the U.S. Gulf of Mexico and internationally. Its liftboats provide a range of offshore support services, including platform maintenance, platform construction, well intervention, and decommissioning services. The company provides its services to integrated energy companies, and independent oil and natural gas operators. As of February 5, 2007, it owned a fleet of 9 jackup rigs and 64 liftboats. The company was founded in 2004 as Hercules Offshore, LLC and changed its name to Hercules Offshore, Inc. in 2005. Hercules Offshore, Inc. is based in Houston, Texas.


W&T OFFSHORE INC (WTI)

W&T Offshore, Inc. engages in the acquisition, exploitation, and exploration of oil and natural gas properties primarily in the Gulf of Mexico. As of December 31, 2004, the company owned working interests in approximately 108 fields and 250 offshore structures; and also had interest in leases covering 927,000 acres. As of the above date, the company had proved reserves of 467.5 billion cubit feet of oil and natural gas. W&T Offshore was co-founded by Tracy W. Krohn and Jerome F. Freel in 1983. The company is based in Houston, Texas.


KODIAK OIL (KOG)

Kodiak Oil & Gas Corp. engages in the exploration, exploitation, development, acquisition, and production of natural gas and crude oil in the western United States. Its oil and natural gas reserves and operations are located in two Rocky Mountain Basins in the United States. The company explores for natural gas in the Green River Basin in Wyoming and Colorado; and in the Williston Basin in Montana and North Dakota. As of December 31, 2006, its total proved reserves comprised 532.9 MBbls of oil and 2,402.4 MMcf of gas. The company was incorporated in 1972 as Pacific Talc, Ltd. and changed its name to Columbia Copper Company, Ltd. in 1998. Further, it changed its name to Kodiak Oil & Gas Corp. in 2001. Kodiak Oil & Gas is headquartered in Denver, Colorado.


HYPERDYNAMICS CORPORATION (HDY)

Hyperdynamics Corporation, through its wholly owned subsidiaries, SCS Corporation and HYD Resources Corporation, focuses on technology-based services for oil and gas exploration. Its oil and gas exploration and exploitation operations include the outsource of oil and gas technology services associated primarily with geophysical data management, including seismic data acquisition; seismic data processing, including specialties in the area of data transcription; data brokerage; geophysical interpretation; and analysis. The company's proprietary ONYX software transcribes seismic data from tape media to modern media, such as DVD computer technology. Hyperdynamics is based in Houston, Texas.


PETRO RESOURCES CORPORATION (PRC)

Petro Resources Corporation, together with its subsidiaries, operates as an independent oil and natural gas company in the United States. It engages in the acquisition, drilling, and production of oil and natural gas properties and prospects. The company holds a 43% working interest in 15 fields located in the Williston Basin in North Dakota; a 5.3% interest in an oil and gas exploration and development partnership that has operations focused primarily offshore in the Gulf of Mexico; a 10% working interest in the Boomerang prospect in southwestern Kentucky; a 10% working interest in the Ozona project located in Crockett County, Texas; and a 10% working interest in a multi-lateral horizontal well in DeSoto Parish, Louisiana. Petro Resources Corporation also owns an 85% working interest in the South San Arroyo Gas prospect comprising 20,300 gross acres located in eastern Utah; mineral acres in the Palo Duro Basin located in Floyd and Motley Counties, Texas; a 25% working interest in the Leopard Branch prospect in Live Oak County, Texas; an 18.75% working interest in the Whitewater prospect covering 9,315 acres situated in Colorado; a 25% working interest in the Davis prospect located in Anderson County, Texas; a 20.83% working interest in the Frost National Bank prospect in Texas; and a 12.5% working interest in the Gemini prospect in Louisiana. As of March 15, 2007, it had approximately 141,364 gross and 33,345 net acres of undeveloped oil and gas leases, and 17,639 gross and 6,644 net acres of developed oil and gas leases. The company was incorporated in 2002 and is based in Houston, Texas.


GASTAR EXPLORATION (GST)

Gastar Exploration, Ltd. engages in the exploration, development, and production of natural gas and oil in the United States and Australia. It operates coal bed methane (CBM) properties in the Powder River Basin in Wyoming and in the Gunnedah and Gippsland Basins of Australia. The company also pursues unconventional natural gas exploration in the deep Bossier play in the Hilltop area in East Texas. Gastar Exploration has accumulated 51,975 gross acres in the Bossier play in the Hilltop area in East Texas. It owns approximately 40% average working interest in 54,966 gross acres in the Powder River Basin of Wyoming; 35% interest in PEL 238, a CBM exploratory property covering approximately 2.0 million gross acres in the Gunnedah Basin of New South Wales, Australia; and 75% interest in the CBM rights in EL 4416, an approximate 1.0 million gross acre property in the Gippsland Basin of Victoria, Australia. In addition, the company provides contract drilling services in the Hilltop area of east Texas. As of December 31, 2006, Gastar Exploration had approximately 31,157 million cubic feet of natural gas; and 30 thousand barrels of oil reserves. The company was founded in 1987 and is headquartered in Houston, Texas.


TRANSMERIDIAN EXPLORATION INC (TMY)

Transmeridian Exploration, Inc., through its subsidiary, Caspi Neft TME, engages in the exploration and production of oil and gas principally in the Republic of Kazakhstan. Caspi Neft holds the license 1557 and exploration contract covering the South Alibek Field. The license covers an area of approximately 14,000 acres located onshore in western Kazakhstan. As of December 31, 2004, the company had total proved reserves of 26,813,736 barrels of oil. Transmeridian Exploration was formed in 2000 and is headquartered in Houston, Texas.


GEOGLOBAL RESOURCES INC (GGR)

GeoGlobal Resources, Inc., a development stage company, through its subsidiaries, engages in the exploration and production of oil and natural gas in India. It primarily has interests and operates in the oil fields located in Krishna-Godavari Basin and Cambay Basin. The company was formed in 2002 and is headquartered in Calgary, Canada.


GEOMET INC (GMET)

GeoMet, Inc. engages in the exploration, development, and production of coal bed methane primarily in the United States and Canada. It also engages in gas marketing activities. In addition, the company, through its subsidiary, provides nominations, gas control, gas balancing, transportation and exchange, market and transportation intelligence, and other advisory and agency services. As of December 31, 2006, the company controlled a total of approximately 77,000 net acres of coalbed methane development rights in the Gurnee field in the Cahaba Basin and in the Pond Creek field in the central Appalachian Basin; and 203,000 net acres of coalbed methane and oil and natural gas development rights primarily in Alabama, north central Louisiana, British Columbia, West Virginia, and Colorado. GeoMet also had 325.7 billion cubic feet of estimated proved reserves, as of above date. The company is based in Houston, Texas.


UNITED HERITAGE CORPORATION (UHCP)

United Heritage Corporation, through its subsidiaries, engages in the exploration and production of natural gas and crude oil. The company holds 4 leasehold properties totaling 30,500 acres in Edwards County, Texas, and Chaves and Roosevelt Counties, New Mexico. As of March 31, 2005, United Heritage's proved developed reserves include 5,629,000 barrels of oil and 2,538,000 thousand cubic feet of gas. The company was formed in 1981 and is based Cleburne, Texas.


ENTERRA ENERGY TRUST (ENT)

Enterra Energy Trust, through its subsidiaries, operates as an oil and gas income trust in Canada. The company's properties include Clair, Provost-Alliance-Wainwright, Brooks, Sylvan Lake, Ricinus-Ferrier, and Lochend properties in Alberta, as well as Desan property in the province of British Columbia. Its also has interest in Grant, Lincoln, and Logan Counties in Oklahoma; and Powder River Basin of Wyoming and Southern Montana, as well as Saskatchewan. As of December 31, 2006, the company's estimated proved and probable reserves were 4,135 thousand barrels of light and medium crude oil, 1,380 thousand barrels of heavy oil, 1,013 thousand barrels of natural gas liquids, and 46,139 million cubic feet of natural gas. It also had interest in approximately 1611 gross producing and non-producing oil and gas wells. The company was founded in 1998 and is headquartered in Calgary, Canada.


PRB GAS TRANSPORTATION INC (PRB)

PRB Gas Transportation, Inc. engages in the ownership and operation of intrastate natural gas gathering systems. It owns approximately 200 miles of pipeline and gathers coal bed methane gas from approximately 450 wells in Wyoming's Powder River Basin. The company's 4.5 mile TOP system located in Campbell County, Wyoming services approximately 56 wells in the Powder River Basin area of Wyoming. PRB Gas Transportation was organized in 2003. It was formerly known as PRB Transportation, Inc. and changed its name to PRB Gas Transportation, Inc. in 2004. The company was founded in 2003 and is based in Denver, Colorado.


JED OIL INC (JDO)

JED Oil, Inc. engages in the exploration, development, and production of natural gas, crude oil, and natural gas liquids in Canada and the United States. It has interests in the Princess/Tide Lake property, located 25 kilometers northeast of the town of Brooks, Alberta; the Sylvan Lake property, located 40 kilometers west of the town of Red Deer, Alberta; and Provost package, located 25 kilometers southwest of the town of Provost, Alberta. As of December 31, 2004, the company had working interests in 8 wells in Princess/Tide Lake area; and 4 wells each in Sylvan Lake and Provost Package properties. JED Oil was incorporated in 2003 and is headquartered in Calgary, Alberta.