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YPF SOCIEDAD ANONIMA (YPF)

YPF Sociedad Anonima (YPF) engages in the exploration, development, and production of oil and gas in Argentina. It also involves in the refining, marketing, transportation, and distribution of crude oil and various petroleum products, its derivatives, petrochemicals, and liquid petroleum gas (LPG) and natural gas. The company markets refined petroleum products, such as gasoline, diesel, jet fuel, kerosene, and heavy fuel oil; as well as other crude oil products, such as motor oils, industrial lubricants, LPG, asphalts, and naphthas. It also engages in electricity-generation activities and participates in four electric generation power stations, which generate approximately 9,409 Gigawatt per hour. As of December 31, 2004, YPF had proved developed reserves of 908 million barrels of crude oil, condensate, and natural gas liquids; and 5,041 billion cubic feet of natural gas. The company was formed in 1977 and is based in Buenos Aires, Argentina. YPF Sociedad Anonima is a subsidiary of Repsol YPF, S.A.


SCHLUMBERGER N.V (SLB)

Schlumberger Limited, an oilfield services company, supplies technology, project management, and information solutions to oil and gas industry in the United States and internationally. The company operates in two segments, Schlumberger Oilfield Services and WesternGeco. Schlumberger Oilfield Services segment supplies a range of technology services and solutions to the international petroleum industry. It provides exploration and production services required during the life of an oil and gas reservoir. This segment offers a range of products and services from formation evaluation through directional drilling, well cementing and stimulation, well completions, and productivity to consulting, software, information management, and information technology infrastructure services that support core industry operational processes. WesternGeco segment provides reservoir imaging, monitoring, and development services. Its services range from 3D and time-lapse (4D) seismic surveys to multicomponent surveys for delineating prospects and reservoir management. Schlumberger Limited was founded in 1927 and is based in New York City.


OCCIDENTAL PETROLEUM CORPORATION (OXY)

Occidental Petroleum Corporation primarily engages in the exploration for, development, production, and marketing of crude oil and natural gas in the United States, Latin America, and Middle East. As of December 31, 2004, the company had proved reserves of 2,489 million barrels of oil and gas equivalent. Occidental Petroleum also manufactures and markets basic chemicals, such as chlorine, caustic soda, potassium chemicals, and their derivatives; vinyls, including polyvinyl chloride (PVC), vinyl chloride monomer, and ethylene dichloride; and performance chemicals, including chlorinated isocyanurates, resorcinol, antimony oxide, mercaptans, and sodium silicates. PVC resins are used in piping, electrical insulation, external construction materials, flooring, medical and automotive products, and packaging. The company markets its chemical products to industrial users or distributors through its own sales force. Occidental Petroleum is headquartered in Los Angels, California.


CHESAPEAKE ENERGY CORPORATION (CHK)

Chesapeake Energy Corporation engages in the acquisition, development, exploration, production, and marketing of oil and natural gas in the United States. It primarily operates in the mid continent region of the United States, which includes Oklahoma, western Arkansas, southwestern Kansas, and the Texas Panhandle. The company also has operations in the Permian Basin of western Texas and eastern New Mexico, in the Ark-La-Tex basin of eastern Texas and northern Louisiana, and in the south Texas and Texas Gulf coast regions. As of December 31, 2004, the company'S estimated proved reserves were 4.9 trillion cubic feet of natural gas equivalent and owned interests in approximately 19,800 producing wells. The company was co-founded by Aubrey K. McClendon and Tom L. Ward in 1989. Chesapeake is headquartered in Oklahoma City, Oklahoma.


VALERO ENERGY CORPORATION (VLO)

Valero Energy Corporation operates as a refining and marketing company. It also produces a slate of gasolines, distillates, jet fuel, asphalt, petrochemicals, low-sulfur diesel fuel, and oxygenates. The company operates in two segments, Refining and Retail. The Refining segment includes refining operations, wholesale marketing, product supply and distribution, and transportation operations. This segment is segregated geographically into the Gulf Coast, Mid-Continent, West Coast, and northeast regions. As of September 22, 2005, the company owned and operated 18 refineries in the United States, Canada, and the Caribbean, with a combined throughput capacity of approximately 3.3 million barrels per day. The Retail segment comprises company-operated convenience stores, Canadian dealers/jobbers, truckstop facilities, cardlock facilities, and home heating oil operations. It operates approximately 4,700 retail and branded wholesale outlets in the United States, Canada, and the Caribbean under various brand names, including Valero, Diamond Shamrock, Shamrock, Ultramar, and Beacon. The company was founded in 1955. It was formerly known as Valero Refining and Marketing Company and changed its name to Valero Energy Corporation in 1997. Valero Energy is headquartered in San Antonio, 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.


TALISMAN ENERGY INC (TLM)

Talisman Energy, Inc. engages in the exploration, development, production, and transportation of crude oil, natural gas, and natural gas liquids principally in North America. The company focuses its activities on Greater Arch, deep basin, Alberta Foothills, Edson area, Monkman/BC Foothills, Lac La Biche, Ontario offshore, southern Alberta Foothills, Ontario onshore, Chauvin, Carlyle, Central Alberta, and Shaunavon in Canada; and deep horizontal Trenton-Black River formation gas wells in the Appalachia area in the United States. It also operates in North Sea; and southeast Asia, including Indonesia, Malaysia, and Vietnam. Talisman Energy has producing interests in Algeria and Trinidad, and exploration interests in Alaska, Colombia, Peru, Qatar, Falkland Islands, and Papua New Guinea. As of December 31, 2004, it had proved and probable net reserves of 838.1 million barrels of oil equivalent of oil and natural gas liquids, 6,016.4 billion cubic feet of natural gas, and 55.6 million barrels of synthetic oil. Talisman Energy was founded in 1925 and is headquartered in Calgary, Canada.


BJ SERVICES COMPANY (BJS)

BJ Services Company provides pressure pumping and other oilfield services for the petroleum industry worldwide. The company's pressure pumping services consist of cementing and stimulation services used in the completion of new oil and natural gas wells, and in remedial work on existing wells both onshore and offshore. Its stimulation services include fracturing, acidizing, sand control, nitrogen services, coiled tubing, and service tools; and cementing services consists of pumping cement slurry into a well between the casing and the wellbore to isolate fluids. The company offers other oilfield services, including completion tools, completion fluids, and casing and tubular services for oil and natural gas exploration and production industry; commissioning and inspection services for refineries, pipelines, and offshore platforms; and production chemical services. Its services are provided both on land and offshore on-call basis through regional and district facilities. The company provides pressure pumping services to independent oil and natural gas producing companies, as well as national oil companies. BJ Services was founded by Byron Jackson in 1872 and is headquartered in Houston, Texas.


DYNEGY INC (DYN)

Dynegy, Inc., a holding company, engages in the power generation and natural gas liquids businesses principally in the United States. The company produces and sells electric power and related products and services, including capacity, into real-time and day-ahead markets, as well as on a forward basis. It provides wholesale power to utilities, cooperatives, municipalities, and commercial and industrial customers. Dynegy gathers and processes natural gas, and fractionates, stores, transports, and markets natural gas liquids. As of December 31, 2004, it owned interests in 17 gas processing plants, including 11 plants it operated. The company also operated approximately 9,385 miles of natural gas gathering pipeline systems, as of the above date. Its distribution and marketing services include refinery services and wholesale propane marketing, as well as purchasing mixed natural gas liquids and natural gas liquids products from natural gas liquids producers and other sources and selling the natural gas liquids products to petrochemical manufacturers, refineries, and other marketing and retail companies. Dynegy was founded in 1985 and is based in Houston, Texas.


DEVON ENERGY CORPORATION (DVN)

Devon Energy Corporation primarily engages in the exploration, development, and production of oil and gas. It also acquires producing properties; transports oil, gas, and natural gas liquids (NGLs); and processes natural gas. The company operates in Permian Basin, the Mid-Continent, the Rocky Mountains, and onshore and offshore Gulf Coast, the United States; western Canadian Sedimentary Basin in Alberta and British Columbia; and in Azerbaijan, China, and Egypt, as well as in west Africa. In addition, Devon markets natural gas, crude oil, and NGLs; and constructs and operates pipelines, storage and treating facilities, and gas processing plants. As of December 31, 2004, the company's estimated proved reserves were 2,077 million barrel of oil equivalent, of which 60% were natural gas reserves, and 40% were oil and NGL reserves. It sells its gas production to various customers, including pipelines, utilities, gas marketing firms, industrial users, and local distribution companies. Devon was founded in 1971 and is headquartered in Oklahoma City, Oklahoma.


WILLIAMS COMPANIES INC (WMB)

The Williams Companies, Inc. engages in finding, producing, gathering, processing, and transporting natural gas. The company operates in four segments: Gas Pipeline, Exploration and Production, Midstream Gas and Liquids, and Power. The Gas Pipeline segment comprises interstate natural gas pipelines, as well as investments in natural gas pipeline-related companies. The Gas Pipeline segment includes Northwest pipeline, which extends from the San Juan Basin in northwestern New Mexico and southwestern Colorado to Oregon and Washington, and Transcontinental gas pipe line, which extends from the Gulf of Mexico region to the northeastern United States. The Exploration and Production includes natural gas development, production, and gas management activities primarily in the Rocky Mountain and Mid-Continent regions of the United States and in Argentina. The Midstream Gas and Liquids segment comprises natural gas gathering, processing, and treating facilities in the Rocky Mountain and Gulf Coast regions of the United States, oil gathering and transportation facilities in the Gulf Coast region of the United States, majority-owned natural gas compression and transportation facilities in Venezuela, and assets in Canada, including a natural gas liquids extraction facility and a fractionation plant. The Power segment provides buys, sells, stores, and transports energy and energy-related commodities primarily power and natural gas, on a wholesale level. The company's had proved natural gas reserves of 2,986 one billion cubic feet of gas equivalent and owned interests in 10,001 gross producing wells, as of December 31, 2004. The Williams Companies was founded in 1908 and is based in Tulsa, Oklahoma.


EOG RESOURCES INC (EOG)

EOG Resources, Inc. operates as an independent oil and natural gas company in the United States. The company, together with its subsidiaries, engages in the exploration, development, production, and marketing of natural gas and crude oil primarily in the United States, Canada, offshore Trinidad, and the United Kingdom North Sea. As of December 31, 2004, the company's total estimated net proven reserves were 5,647 billion cubic feet equivalent of which natural gas reserves were 5,047 billion cubic feet; and crude oil, condensate, and natural gas liquids reserves were 100 million barrels. EOG Resources was organized in 1985. It was formerly known as Enron Oil & Gas Company and changed its name to EOG Resources, Inc. in 1999. EOG is headquartered in Houston, 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.


WEATHERFORD INTERNATIONAL INC (WFT)

Weatherford International, Ltd. provides equipment and services for use in drilling, completion, and production of oil and natural gas wells. It operates through two segments, Drilling Services and Production Systems. The Drilling Services segment provides various drilling methods, well construction products and services, drilling tools, and intervention services. The company offers underbalanced systems used during the drilling and servicing of oil and natural gas wells through underbalanced reservoir drilling, performance drilling, and managed pressure drilling methods. Well construction products and services include tubular running, cementing products, liner systems, and solid tubular expandable technologies. Drilling tools comprise drill pipe and related drill stem tools, drill collars, heavy weight pipe, and drilling jars; fishing and downhole tools, such as milling tools, casing cutters, fishing jars, spears and overshots, stabilizers, power swivels, and bottom hole assemblies; pressure control equipment, including blow-out preventers, valves, accumulators, adapters, and choke and kill manifolds; and tubular handling equipment, including elevators, spiders, slips, tongs, and kelly spinners. Intervention products and services include fishing services, thru-tubing products and services, coiled tubing, and wireline systems and production logging. The Production Systems segment provides completion systems and artificial lift systems. Completion systems comprise cased hole completion systems, sand screens, expandable sand screens, and flow control systems. Artificial lift systems include progressing cavity pumps, reciprocating rod systems, gas lift systems, electrical submersible pumps, and hydraulic and other lift systems. The company is headquartered in Houston, Texas.


APACHE CORPORATION (APA)

Apache Corporation engages in the exploration, development, and production of crude oil, natural gas, and natural gas liquids. In North America, its exploration and production interests are focused in the Gulf of Mexico, the Gulf Coast, the Permian Basin, the Anadarko Basin, and the western sedimentary basin of Canada. The company also has exploration and production interests offshore and onshore Egypt, offshore Western Australia, offshore the United Kingdom in the North Sea, offshore the People's Republic of China, and onshore Argentina. As of December 31, 2004, the company had total estimated proved reserves of 932 millions barrels of crude oil, condensate, and natural gas liquids; and 6.0 trillion cubic feet of natural gas. Apache Corporation was formed in 1954 and is based in Houston, Texas.


MARATHON OIL CORPORATION (MRO)

Marathon Oil Corporation, through its subsidiaries, primarily engages in the energy business. The company operates in three segments: Exploration and Production (EP); Refining, Marketing, and Transportation (RMT); and Integrated Gas (IG). The EP segment engages in the exploration, development, and production of liquid hydrocarbon and natural gas in the United States, Norway, Angola, Equatorial Guinea, Canada, the United Kingdom, Ireland, and Russia. As of December 31, 2004, its net proved liquid hydrocarbon and natural gas reserves totaled approximately 1.139 billion barrels of oil equivalent. The RMT segment owns and operates seven refineries, which include crude oil atmospheric and vacuum distillation, fluid catalytic cracking, catalytic reforming, desulfurization, and sulfur recovery units. These refineries process various crude oils and produce typical refinery products, including reformulated gasoline. This segment also produces asphalt cements, polymerized asphalt, asphalt emulsions, and industrial asphalts, as well as manufactures petroleum pitch, aromatics, aliphatic hydrocarbons, cumene, base lube oil, polymer grade propylene, and slack wax. It markets its products to home heating, industrial, and chemical industries, as well as to contractors, government entities, and manufacturers. The IG segment's operations include natural gas liquefication and regasification operations, methanol operations, certain other gas processing facilities and pipeline operations, and marketing and transportation of natural gas. The company was founded in 1887 by Henry M. Ernst under the name The Ohio Oil Company. It changed its name to Marathon Oil Company in 1962. The company further changed its name to Marathon Oil Corporation in October 2001, following the spin-off of its steel and steel-related business. Marathon Oil Corporation is headquartered in Houston, Texas.


BP P.L.C (BP)

BP p.l.c. engages in oil and natural gas exploration, and field development and production, as well as in the management of crude oil and natural gas pipelines, processing and export terminals, and liquefied natural gas (LNG) processing facilities worldwide. As of December 31, 2004, the company had interests in four LNG plants in Australia, Indonesia, and Trinidad, as well as operated the Trans Alaska Pipeline System, and the Forties Pipeline System and the Central Area Transmission System pipeline both in the United Kingdom sector of the North Sea. As of the above date, its total hydrocarbon proved reserves comprised 14,626 million barrels of oil and natural gas equivalent. BP also engages in the processing, fractionation, and marketing of ethane, propane, butanes, and pentanes extracted from natural gas. The company supplies, trades, refines, markets, and transports crude oil and petroleum products to wholesale and retail customers. In addition, it develops, produces, and markets solar panels and wind farms, and involves in gas fired power generation projects. Further, BP offers chemicals and plastics to bulk, wholesale, and retail customers. The company produces aromatics and acetyls, and olefins and derivatives, which are used in the manufacture of various consumer goods, including plastic drinks bottles, computer housings, adhesives, inks, rigid packaging, pipes, food packaging, and automobile components, as well as textiles for clothes and carpets. BP has a joint venture with China Petroleum & Chemical Corp. The company was founded in 1889 and is headquartered in London.


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.


XTO ENERGY INC (XTO)

XTO Energy, Inc., an independent oil and gas company, primarily engages in the acquisition, development, exploitation, and exploration of producing oil and gas properties in the United States. The company also produces, processes, markets, and transports oil and natural gas. The company's proved reserves are principally located in the Eastern Region, including the East Texas Basin and northwestern Louisiana; Barnett Shale of North Texas; San Juan and Raton basins of northern New Mexico and southern Colorado; and Arkoma Basin of Arkansas and Oklahoma. Its reserves are also located in Permian Basin of west Texas and southeastern New Mexico; Hugoton Field of Oklahoma and Kansas; Anadarko Basin of Oklahoma; Green River and Powder River basins of Wyoming; Uinta Basin of Utah; Middle Ground Shoal Field of Alaska's Cook Inlet; and South Texas Region. As of December 31, 2004, the company's estimated proved reserves were 4.71 trillion cubic feet of natural gas, 38.5 million barrels of natural gas liquids, and 152.5 million barrels of oil. XTO Energy was founded in 1985. The company was co-founded by Bob R. Simpson and Steffen E. Palko. It was formerly known as Cross Timbers Oil Company and changed its name to XTO Energy, Inc. in 2001. XTO Energy is headquartered in Fort Worth, 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.


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.


EXXON MOBIL CORPORATION (XOM)

Exxon Mobil Corporation operates as a petroleum and petrochemicals company. It primarily engages in the exploration, production, and sale of crude oil and natural gas; and manufacture, transportation, and sale of petroleum products. The company also manufactures and markets basic petrochemicals, including olefins, aromatics, polyethylene, fluids, synthetic rubber, oriented polypropylene packaging films, plasticizers, synthetic lubricant basestocks, zeolite catalysts, and polypropylene plastics; and various specialty products. In addition, Exxon Mobil has interests in electric power generation facilities. Its other products include lube basestocks and petroleum specialties, such as waxes, process oils, and asphalt. The company operates approximately in 200 countries worldwide, including the United States, Canada, Europe, Asia-Pacific, Africa, South America, the Middle East, and the Caspian area. Exxon Mobil is based in Irving, Texas.


HALLIBURTON COMPANY (HAL)

Halliburton Company provides engineering, construction, and maintenance services to energy, industrial, and government customers worldwide. It operates in six segments: Production Optimization, Fluid Systems, Drilling and Formation Evaluation, Digital and Consulting Solutions, Government and Infrastructure, and Energy and Chemicals. The Production Optimization segment primarily tests, measures, and provides means to manage well production in the energy sector. It also consists of production enhancement services, and completion tools and services. The Fluid Systems segment provides services and technologies to assist in the drilling and construction of oil and gas wells. The Drilling and Formation Evaluation segment primarily engages in drilling and evaluating the formations related to bore-hole construction and initial oil and gas formation evaluation. The Digital and Consulting Solutions segment provides integrated exploration and production software information systems, consulting services, real-time operations, subsea operations, value-added oilfield project management, and other integrated solutions. It also offers Landmark Graphics, which supplies integrated exploration and production software information systems, as well as professional and data management services. The Government and Infrastructure segment operates as government logistics and services contractors with civil infrastructure capabilities. It represents construction, maintenance, and logistics services for government operations, facilities, and installations. Further, this segment includes civil engineering; consulting; project management services for state and local governments and private industries; integrated security solutions; dockyard operation; and maintenance. The Energy and Chemicals segment provides engineering, procurement, construction, technology, and services for the energy and chemicals industries. Halliburton was founded in 1919 and is based in Houston, Texas.


BAKER HUGHES INCORPORATED (BHI)

Baker Hughes Incorporated supplies wellborerelated products, and technology services and systems to the worldwide oil and natural gas industry. It provides products and services for drilling, formation evaluation, completion, and production of oil and natural gas wells. The company operates in seven divisions: Baker Atlas, Baker Hughes Drilling Fluids (BHDF), Baker Oil Tools (BOT), Baker Petrolite, Centrilift, Hughes Christensen, and INTEQ. Its Baker Atlas division provides formation evaluation and wireline completion, and production services for oil and natural gas wells. The company's BHDF division provides drilling fluids, completion fluids, and fluids environmental services. BOT division offers downhole completion, workover, and fishing equipment and services. Its Baker Petrolite division provides specialty chemicals primarily to oil and natural gas production, refining, pipeline transportation, petrochemical, agricultural, and iron and steel manufacturing industries. This division also offers polymer-based products to a range of industrial and consumer markets. The company's Centrilift division manufactures and supplies electrical submersible pump systems and progressing cavity pump systems. Its Hughes Christensen division offers drill bits, primarily Tricone roller cone bits and fixed-cutter polycrystalline diamond compact bits, to the oil and natural gas industry. INTEQ division supplies drilling and evaluation services, which include directional drilling, measurement-while-drilling, and logging-while-drilling services. Baker Hughes Incorporated is headquartered in Houston, Texas.


SUNOCO INC (SUN)

Sunoco, Inc., through its subsidiaries, engages in the manufacture and marketing of petroleum and petrochemical products in the United States. The company operates in five segments: Refining and Supply, Retail Marketing, Chemicals, Logistics, and Coke. The Refining and Supply segment manufactures petroleum products, including gasoline; middle distillates, primarily jet fuel, heating oil, and diesel fuel; and residual fuel oil. It also produces commodity petrochemicals, including olefins and their derivatives, such as ethylene, ethylene oxide polymers, and refinery-grade propylene; and aromatics and their derivatives, which include benzene, cyclohexane, toluene, and xylene. The segment also manufactures petroleum and lubricant products. It sells its products primarily to wholesale and industrial customers. The Retail Marketing segment engages in the retail sale of gasoline and middle distillates, as well as the operation of convenience stores in 24 states, primarily on the East Coast and in the midwest region of the United States. The Chemicals segment manufactures, distributes, and markets commodity and intermediate petrochemicals. These chemicals consist of aromatic derivatives, such as cumene, phenol, acetone, and bisphenol-A; and polypropylene. The Logistics segment operates refined product crude oil pipelines and terminals, and conducts crude oil acquisition and marketing activities. The Coke segment manufactures metallurgical coke for use in the steel industry. Sunoco was founded in 1886 and is headquartered in Philadelphia, Pennsylvania.


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.


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.


SMITH INTERNATIONAL INC (SII)

Smith International, Inc. supplies products and services to the oil and gas exploration and production industry, the petrochemical industry, and other industrial markets worldwide. The company operates in two segments, Oilfield Products and Services, and Distribution. The Oilfield Products and Services segment includes M-I SWACO, which provides drilling and completion fluid systems and services, solids-control and separation equipment, waste-management services, and oilfield production chemicals; Smith Technologies, which manufactures and sells three-cone drill bits, diamond drill bits, and turbine products; and Smith Services, that offers products and services used for drilling, workover, well completion, and well reentry operations. The Distribution segment consists of a supply-chain management company, which markets a range of products and services, including pipe, valves, and fittings, as well as mill, safety, and other maintenance products for the energy, refining, petrochemical, power generation, and mining industries in the United States and Canada. In addition, it provides underreamers, casing exit and multilateral systems, packers, liner hangers, and supply-chain management solutions. Smith International was incorporated in 1937 and is headquartered in Houston, Texas.


IVANHOE ENERGY INC (IVAN)

No description available.


SUNCOR ENERGY INC (SU)

Suncor Energy, Inc. operates as an integrated energy company in Canada. The company produces light sweet and light sour crude oil, diesel fuel, and various custom blends from oil sands mined in the Athabasca region of northeastern Alberta and markets these products in Canada and the United States. Its other businesses include the exploration, acquisition, development, production, transportation, and marketing of natural gas, natural gas liquids, and crude oil in Canada and the United States; refining, transporting, and marketing petroleum and petrochemical products, such as gasoline, jet fuel, diesel, heating fuels, heavy fuel oils, and petrochemicals to industrial, commercial, wholesale, and refining customers in Ontario and Quebec, Canada, and in Colorado and Wyoming, the United States. As of December 31, 2004, the company operated 43 retail stations primarily in Denver. Suncor Energy is headquartered in Calgary, Canada.


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.


NOBLE ENERGY INC (NBL)

Noble Energy, Inc. engages in the exploration, production, and marketing of crude oil and natural gas worldwide. Its domestic oil and gas assets are located primarily offshore in the Gulf of Mexico and onshore in the Gulf Coast region. Noble Energy also has projects in Argentina, China, Ecuador, Equatorial Guinea, Israel, and North Sea. The company's wholly owned subsidiary, Noble Energy Marketing, Inc., markets a majority of its domestic natural gas and crude oil, as well as certain third-party natural gas and crude oil. As of January 1, 2005, Noble Energy had proved developed oil reserves of 1,370,461 million cubic feet and gas reserves of 168,496 thousand barrels. The company was formerly known as Noble Affiliates, Inc. and changed its name to Noble Energy, Inc. in 2002. Noble Energy is headquartered in Houston, Texas.


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.


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.


GRANT PRIDECO INC (GRP)

Grant Prideco, Inc. offers various oilfield equipment and services to the oil and gas industry worldwide. It operates through three segments: Drilling Products and Services, Drill Bits, and Tubular Technology and Services. The Drilling Products and Services segment manufactures and sells drill pipes, drill collars, heavyweight drill pipe, and drill stem accessories. The Drill Bits segment designs, manufactures, and distributes fixed-cutter and roller-cone drill bits. The Tubular Technology and Services segment designs, manufactures, and sells a line of connections, and associated tubular products and accessories for oil country tubular goods and offshore applications. The company sells its products to drilling contractors, oil country tubular goods distributors, oil companies, and oilfield service companies. Grant Prideco was incorporated in 1990 and is headquartered in Houston, Texas.


RANGE RESOURCES CORPORATION (RRC)

Range Resources Corporation engages in the exploration, development, and acquisition of oil and gas properties primarily in the southwestern, Gulf Coast, and Appalachian regions, the United States. As of December 31, 2004, the company owned 1,890,000 net acres of leasehold and approximately 400,000 royalty acres of developed and undeveloped oil and gas property. As of the above date, the company had proved reserves of 1.18 trillion cubic feet equivalent of oil and natural gas. The company was founded in 1975. It was formerly known as Lomak Petroleum, Inc. and changed its name to Range Resources Corporation in 1998. Range Resources is headquartered in Fort Worth, Texas.


BHP BILLITON LIMITED (BHP)

BHP Billiton Limited, together with its subsidiaries, engages in mining, drilling, and processing mineral resources. It produces iron ore, copper, nickel metal, manganese, diamonds, silver, titanium, aluminium, and uranium. The company also engages in the exploration, production, and development of oil and natural gas in Australia, the United Kingdom, the United States, Algeria, Trinidad and Tobago, and Pakistan. The company also exports metallurgical coal for the steel industry, and energy coal. In addition, it has exploration interests in the United States, Australia, Trinidad and Tobago, Pakistan, Algeria, Brunei Darussalam, South Africa, Canada, and the Philippines. BHP Billiton Limited is headquartered in Melbourne, Australia.


COOPER CAMERON CORPORATION (CAM)

Cooper Cameron Corporation manufactures oil and gas pressure control and separation equipment worldwide. It operates in three segments: Cameron, Cooper Cameron Valves (CCV), and Cooper Compression. Cameron segment provides systems and equipment used to control pressures and direct flows of oil and gas wells. Its products include surface and subsea production systems, blowout preventers, drilling and production control systems, gate valves, actuators, chokes, wellheads, drilling riser, and aftermarket parts and services. Cameron also manufactures elastomers, which are used in pressure and flow control equipment and other petroleum industry applications, as well as in the petroleum, petrochemical, rubber molding, and plastics industries. CCV segment offers valves and related systems primarily used to control pressures and direct the flow of oil and gas as they are moved from individual wellheads through flow lines, gathering lines, and transmission systems to refineries, petrochemical plants, and industrial centers for processing. Its products include gate valves, ball valves, butterfly valves, orbit valves, rotary process valves, block and bleed valves, plug valves, globe valves, check valves, actuators, chokes, and aftermarket parts and services. Cooper Compression segment provides reciprocating and centrifugal technology applications. Its products include aftermarket parts and services, integral reciprocating engine-compressors, reciprocating compressors, turbochargers, integrally geared centrifugal compressors, and compressor systems. Its aftermarket services include spare parts, technical services, repairs, overhauls, and upgrades. The company's customers include oil and gas majors; independent producers; engineering and construction companies; drilling contractors; rental companies; pipeline operators; chemical, petrochemical, and refining companies; and geothermal energy producers. Cooper Cameron was incorporated in 1994 and is headquartered in Houston, Texas.


TESORO PETROLEUM CORPORATION (TSO)

Tesoro Corporation and its subsidiaries engage in refining and marketing petroleum products in the United States. The company operates in two segments, Refining and Retail. The Refining segment owns and operates six petroleum refineries located in California, Washington, Hawaii, Alaska, North Dakota, and Utah. It manufactures various products, including gasoline and gasoline blendstocks, jet fuel, diesel fuel, and heavy fuel oils for sale to various commercial customers in the midcontinental and western United States. The company's Retail segment distributes motor fuels to wholesale and retail customers, as well as to commercial end-users through a network of gas stations primarily under the Tesoro and Mirastar brand names. It sells gasoline and diesel fuel to retail customers through company operated retail stations and branded jobber/dealers in the midcontinental and western United States. As of December 31, 2004, Retail segment included a network of 506 retail stations, which comprised 214 company operated retail gasoline stations and 292 jobber/dealer stations. Tesoro was founded in 1939. It was formerly known as Tesoro Petroleum Corporation and changed its name to Tesoro Corporation in November 2004. Tesoro is headquartered in San Antonio, Texas.


FRONTIER OIL CORPORATION (FTO)

Frontier Oil Corporation (FOC), an energy company, engages in crude oil refining and the wholesale marketing of refined petroleum products. The company purchases crude oil to be refined and markets the refined petroleum products, including various grades of gasoline, diesel fuel, jet fuel, asphalt, chemicals, and petroleum coke. It operates refineries in Cheyenne, Wyoming and El Dorado, Kansas. The gasoline and diesel produced by Cheyenne refinery are primarily shipped via pipeline to terminals for distribution by truck or rail. The pipeline shipments from the Cheyenne refinery are handled mainly by the Kaneb pipeline, serving Denver and Colorado Springs, Colorado; and the ConocoPhillips pipeline, serving Sidney, Nebraska. The primary markets for the El Dorado refinery's refined products are Colorado and the Plains States, which include the Kansas City metropolitan area. The gasoline, diesel, and jet fuel produced by this refinery are primarily shipped via pipeline to terminals for distribution by truck or rail. The Kaneb pipeline serves the northern Plains States; the Magellan pipeline Denver, Colorado; and the Magellan pipeline serves Kansas City and Carthage, Missouri and Des Moines, Iowa. FOC also owns FGI, LLC, an asphalt terminal and storage facility in Grand Island, Nebraska. Frontier Oil, formerly known as Wainoco Oil Corporation, was incorporated in 1949 and is headquartered in Houston, Texas.


NEXEN INC (NXY)

No description available.


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.


DELTA PETROLEUM CORPORATION (DPTR)

Delta Petroleum Corporation, an independent energy company, engages in the acquisition, exploration, development, and production of oil and gas properties. Its oil and gas operations include production of oil and gas; drilling exploratory and development wells and related operations; and acquiring and selling oil and gas properties. The company's products include crude oil and natural gas. The principal markets for oil and gas are refineries and transmission companies. As of June 30, 2005, the company owned producing and nonproducing oil and gas interests, undeveloped leasehold interests, and related assets in 15 states, as well as interests in a producing federal unit offshore California and undeveloped offshore federal leases near Santa Barbara, California. The company had proved reserves of 224.3 billion cubic feet of gas equivalent, as of the above date. Delta Petroleum was organized in 1984 and is based in Denver, Colorado.


QUICKSILVER RESOURCES INC (KWK)

Quicksilver Resources, Inc., an independent oil and gas company, engages in the exploration, acquisition, development, production, and sale of natural gas, crude oil, and natural gas liquids in the United States and Canada. It also involves in the marketing, processing, and transmission of natural gas. The company primarily develops and produces unconventional natural gas reserves, including coal bed methane, shale gas, and tight sands gas. Quicksilver has interests in Alberta Basin shallow gas sands in Alberta; New Albany Shale in Indiana/Kentucky; Antrim Shale, Prairie du Chien, Detroit River, Richfield, and Niagaran Reef properties in Michigan; Rocky Mountain properties in Montana and Wyoming; and other properties in Texas. As of December 31, 2004, Quicksilver Resources had estimated proved reserves of 968 billions of cubic feet of natural gas equivalent. It sells natural gas and crude oil to various customers, including utilities, oil and gas companies or their affiliates, industrial companies, trading and energy marketing companies, refineries, and other users of petroleum products. The company was founded in 1997 and is headquartered in Fort Worth, Texas.


HYDRIL (HYDL)

Hydril Company engages in engineering, manufacturing, and marketing premium connection and pressure control products that are used for oil and gas drilling and production worldwide. Its premium connections are used for casing, production tubing, and drill pipe. The company also provides technical solutions and field support services to address specific customer needs in the design, selection, and maintenance of premium connections. In addition, Hydril manufactures tubing that is lightweight, flexible, resists corrosion, and fatigue for use in transporting oil and gas both out of the well, and from the well to storage facilities. The company's pressure control equipment are used in oil and gas drilling, and well completion and maintenance. Its products regulate formation and drilling fluid pressure during normal operations and prevent well blowouts when the pressure of formation fluids and gases reaches critical levels. The pressure control products include blowout preventers, diverters, subsea control systems, drill stem valves, production chokes, pulsation dampeners, and various specialized elastomer products. Hydril also provides integrated subsea control systems, which include a series of blowout preventers stacked on top of one another, along with other types of valves, and diverters. It also manufactures metal replacement parts, including ram blocks, pistons, cylinders, seal seats, and valves, as well as elastomer replacement parts that include packing units for ram, annular blowout preventers, and seal kits. The company sells its premium connection products primarily to exploration and production company operators, and pressure control products to drilling contractors for use in oil and gas drilling, as well as to exploration and production companies for oil and gas production. Hydril was founded in 1933 and is headquartered in Houston, Texas.


ENCORE ACQUISITION COMPANY (EAC)

Encore Acquisition Company engages in the acquisition, development, exploitation, exploration, and production of onshore North American oil and natural gas reserves. The company's oil and natural gas properties primarily concentrated in the Cedar Creek Anticline in the Williston Basin of Montana and North Dakota; the Permian Basin of west Texas and southeastern New Mexico; the MidContinent area, which includes the Arkoma and Anadarko Basins of Oklahoma, the ArkLaTx region of northern Louisiana and east Texas, and the Barnett Shale of north Texas; and the Rockies that comprises nonCCA assets in the Williston and Powder River Basins of Montana, as well as the Paradox Basin of southeastern Utah. As of December 31, 2004, its total proved oil and natural gas reserves were 173,053 thousand barrels of oil equivalent. Encore principally sells its products to end users, marketers, refiners, and other purchasers in the United States. The company was organized in 1998 and is based in Fort Worth, Texas.


NEWFIELD EXPLORATION COMPANY (NFX)

Newfield Exploration Company engages in the exploration, development, and acquisition of crude oil and natural gas properties. Its areas of operation include the Gulf of Mexico, the United States onshore Gulf Coast, the Anadarko and Arkoma Basins of the Mid-Continent, and the Uinta Basin of the Rocky Mountains, as well as offshore Malaysia, offshore Brazil, China's Bohai Bay, and the North Sea. As of December 31, 2004, the company had proved oil and gas reserves of 1.8 trillion cubic feet equivalent, of which 70% were located onshore in the United States, 28% were located in the Gulf of Mexico, and 2% were located internationally. As of the above date, Newfield Exploration owned interests in approximately 300 leases on the Shelf and 80 leases in deepwater, and approximately 330 gross wells in the Gulf of Mexico; approximately 277,000 gross acres and approximately 495 gross wells the onshore Gulf Coast; approximately 514,000 gross lease acres, 22,000 gross mineral acres, and 2,420 gross wells in the Mid Continent; and 110,000 gross acres, 568 gross producing wells, and 293 water injection wells in the Rocky Mountains. The company was founded in 1988 by Joe B. Foster and is headquartered in Houston, Texas.


TOTALFINAELF S.A (TOT)

TOTAL S.A. operates as an energy company in approximately 130 countries worldwide. It has three segments: Upstream, Downstream, and Chemicals. Upstream segment includes exploration, development, and production activities, as well as natural gas transportation, storage and trading, power generation, liquefied natural gas, liquefied petroleum gas (LPG), and coal operations. Downstream segment covers trading and shipping, refining and marketing of the company's and Elf brand petroleum products, automotive and other fuels, and specialties, such as LPG, aviation fuel, and lubricants, through both the retail network and other outlets worldwide. Chemicals segment comprises an array of operations, including petrochemicals; fertilizers; specialties; elastomer processing; and a unit combining vinyl products, industrial chemicals, and performance products. It serves various industries, including automobiles and transportation, packaging, construction, sports and leisure, health and beauty care, water treatment, paper, electronics, and agriculture. As of December 31, 2004, the company's combined proved reserves of crude oil and natural gas were 11,148 Mboe, of which 51% were proved developed reserves and 49% were proved undeveloped reserves. As of the above date, it held interests in 28 refineries. TOTAL S.A. was incorporated in 1924 and is based in Courbevoie, France.


GLOBAL INDUSTRIES LTD (GLBL)

Global Industries, Ltd. provides marine construction and support services in the United States Gulf of Mexico, West Africa, Asia Pacific, Latin America, and the Middle East. It offers pipeline construction, platform installation and removal, and construction support and diving services. The company also operates construction vessels. As of December 31, 2004, its fleet consisted of 45 vessels, and 40 manned vessels. The company also leases or charters vessels and equipment, such as tugboats, cargo barges, utility boats, dive support vessels, and remotely operated vehicle. Global Industries was founded by William J. Dore and is headquartered in Carlyss, Louisiana.


FOREST OIL CORPORATION (FST)

Forest Oil Corporation engages in the acquisition, exploration, development, and production of natural gas and liquids principally in North America. As of December 31, 2004, it had total proved reserves of 1,334,003 million cubic feet equivalent of natural gas and liquids. The company also held interests in approximately 3,600 net oil and gas wells in the United States and Canada, as of the above date. Forest Oil Corporation was founded in 1916 and is headquartered in Denver, Colorado.


PIONEER NATURAL RESOURCES COMPANY (PXD)

Pioneer Natural Resources Company operates as an oil and gas exploration, and production company. The company produces oil, natural gas liquids, and gas. Its properties primarily include Hugoton field located in southwest Kansas; West Panhandle field in the panhandle region of Texas; and Spraberry field located in west Texas. The company has operations principally in the United States, Argentina, Canada, Gabon, South Africa, and Tunisia. As of December 31, 2004, the company's proved reserves totaled 1.0 billion barrel of oil equivalent. Pioneer Natural Resources was formed through the merger of Parker & Parsley Petroleum Company and MESA, Inc. in 1997. The company is headquartered in Irving, Texas.


EDGE PETROLEUM CORPORATION (EPEX)

Edge Petroleum Corporation, an oil and natural gas company, engages in the exploration, development, acquisition, and production of crude oil and natural gas properties in the United States. It has interests in approximately 30,196 net acres in south and south-central Texas, 1,161 net acres in south Louisiana, 4,426 net acres in Mississippi, and 658 net acres in Michigan, as well as 19,472 net acres in southeastern New Mexico. As of December 31, 2004, the company had 89.1 billion cubic feet of net proved reserves that comprised 66.3 billion cubic feet of natural gas, 1.8 million barrels of natural gas liquids, and 2.0 million barrels of crude oil and condensate. Edge Petroleum was founded in 1983 and is based in Houston, Texas.


SYNTROLEUM CORPORATION (SYNM)

Syntroleum Corporation engages in the research and development of a proprietary process (the Syntroleum Process) designed to convert natural gas or synthesis gas into synthetic liquid hydrocarbons, as well as in the commercialization of the Syntroleum Process. Synthetic liquid hydrocarbons produced by the Syntroleum Process are further processed, using the Syntroleum Synfining Process, into various liquid fuels, such as diesel, jet fuel, kerosene, and naphtha, as well as specialty products, such as synthetic lubricants, synthetic drilling fluid, waxes, liquid normal paraffin solvents, and certain chemical feedstocks. The company also licenses its process to others for the manufacture of fuels. Syntroleum is based in Tulsa, Oklahoma.


DENBURY RESOURCES INC (HOLDING COMPANY) (DNR)

Denbury Resources, Inc. engages in the acquisition, development, operation, and exploration of oil and natural gas properties in the Gulf Coast region of the United States, primarily in Louisiana, Mississippi, and Texas. It owns interest in 29 oil and gas wells in the Fort Worth Basin in North Central Texas; 586 wells in the eastern part of the Mississippi salt basin; 84 wells in the land and marshes of south Louisiana; and 1 well in Offshore Gulf Coast. It also owns a carbon dioxide (CO2) tertiary flood in the western Mississippi, which it uses for injection in its tertiary oil recovery operations. As of December 31, 2004, it had 101,287(MBbls) of proved oil reserves and 168,484(MMcf) of proved natural gas reserves. The company was incorporated in 1951 and is headquartered in Plano, Texas.


BP PRUDHOE BAY ROYALTY TRUST (BPT)

BP Prudhoe Bay Royalty Trust operates as a grantor trust in the United States. The trust holds overriding royalty interest in the Prudhoe Bay Unit located on the North Slope in Alaska. The royalty interest constitutes a nonoperational interest in minerals, which entitles the trust to a royalty on 16.4246% of the first 90,000 barrels of the average actual daily net production of oil and condensate per quarter. BP Prudhoe Bay Royalty Trust was formed in 1989 and is based in New York City.


PRECISION DRILLING CORPORATION (PDS)

Precision Drilling Trust provides contract drilling services to the oil and gas industry in Canada. The trust provides its customers with access to an extensive fleet of drilling and service rigs, as well as a range of support services. The company was formerly known as Precision Drilling (1987), Ltd. and changed its name to Precision Drilling Corporation in 1992. It further changed its name to Precision Drilling Trust in November 2005. The trust is headquartered in Calgary, Canada.


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.


CABOT OIL & GAS CORPORATION (COG)

Cabot Oil & Gas Corporation (COGC) and its subsidiaries engage in the acquisition, exploration, development, exploitation, production, and marketing of oil and gas properties primarily in North America. It transports, stores, gathers, and purchases natural gas for resale. The company also operates gas gathering and transmission pipeline systems; and local distribution companies. It operates in five principal areas, which include Appalachian Basin, Rocky Mountains, Anadarko Basin, onshore and offshore the Texas and Louisiana Gulf Coast, and the gas basin of West Canada. As of December 31, 2004, the company had approximately 4,532 wells and approximately 1,202 billion cubic feet equivalent of proved natural gas reserves. COGC is headquartered in Houston, Texas.


PETRO-CANADA (PCZ)

Petro-Canada, an oil and gas company, provides petroleum products and services in Canada. The company operates in the upstream and downstream sectors of oil and gas industry. Its upstream sector explores for, develops, produces, and markets crude oil, natural gas liquids (NGL), and natural gas in Canada and internationally. This sector involves in the exploration and production of natural gas in western Canada and the U.S. Rockies; marketing of natural gas in North America; exploration, development, and production of crude oil offshore Newfoundland and Labrador; and development and production of bitumen and synthetic crude oil in northeastern Alberta. It also explores, develops, produces, and markets oil and natural gas in northwest Europe, North Africa, and northern Latin America. The company's downstream sector refines crude oil and other feedstocks, as well as markets and distributes petroleum products, and related goods and services in Canada. This sector produces a range of refined petroleum products, such as gasoline, diesel oils, heating oils, aviation fuels, heavy fuel oils, asphalts, petrochemicals, and feedstocks for lubricants; and distributes refined products to retail outlets, and commercial and industrial customers. The company markets its own petroleum products and third parties products, through its retail outlets to farm, home heating, paving, small industrial, commercial, and truck markets. In addition, it offers various services, such as convenience stores, car washes, automotive repair, and maintenance services. As of December 31, 2004, Petro-Canada's network of retail sites consisted of 1,375 outlets in Canada, of which 863 were company controlled. The company is headquartered in Calgary, Canada.


MURPHY OIL CORPORATION (MUR)

Murphy Oil Corporation operates as a holding company that engages in the exploration, production, refining, and marketing of oil and gas worldwide. Its activities are segregated into Exploration and Production, and Refining and Marketing divisions. The Exploration and Production division explores for and produces crude oil, natural gas, and natural gas liquids worldwide. The Refining and Marketing division primarily consists of operations that refine crude oil and other feedstocks into petroleum products, such as gasoline and distillates; buy and sell crude oil and refined products; and transport and market petroleum products. The company has an interest in a Canadian synthetic oil operation, owns two petroleum refineries in the United States, and has an interest in a refinery in the United Kingdom. As of December 31, 2004, Murphy Oil owned 661 gross and 328 net oil-producing wells, and 202 gross and 88 net gas producing wells. The company markets petroleum products under various brand names and to unbranded wholesale customers in North America and the United Kingdom. Murphy Oil was incorporated in 1950 as Murphy Corporation and changed its name to Murphy Oil Corporation in 1964. The company is based El Dorado, Arkansas.


ENERGY PARTNERS LTD (EPL)

Energy Partners, Ltd. engages in the oil and natural gas exploration and production focusing on the shallow to moderate depth waters of the Gulf of Mexico Shelf. The company had interests in 29 producing fields and 5 fields under development; and 1 field with drilling operations, as of December 31, 2004. It had proved reserves of approximately 149.8 billion cubic feet of natural gas and 53.7 million barrels of oil, as of the above date. Energy Partners was founded by Richard A. Bachmann in 1998. The company is based in New Orleans, Louisiana.


CARRIZO OIL & GAS INC (CRZO)

Carrizo Oil & Gas, Inc. engages in the exploration, development, and production of natural gas and oil. The company focuses on operations in proven, producing natural gas and oil geologic trends along the onshore gulf coast in Texas and Louisiana, primarily in the Miocene, Wilcox, Frio, and Vicksburg trends. Carrizo also has interest in Barnett Shale area in north Texas and coalbed methane investment in the Rocky Mountains. As of December 31, 2004, the company operated 92 producing oil and gas wells, and had total proved reserves of 109.3 billion cubic feet of gas equivalent. Carrizo Oil was formed in 1993 and is based in Houston, Texas.


TESCO CORPORATION (TESOF)

Tesco Corporation engages in the design, manufacture, sale, operation, and service of oilfield equipment used in drilling oil, gas, and geothermal wells. It also designs and manufactures drilling rigs, drilling machinery, and related equipment. The company operates through two segments, Top Drives and Casing Services. The Top Drives segment engages in the design, manufacture, rental, sale, and operation of top drive drilling systems. It offers both hydraulic and electric powered systems. The Casing Services segment offers its CASING DRILLING technology, a method for drilling wells, which allows a well to be drilled with conventional oil field casing. It also provides casing running services, and downhole tool rental and accessory sales. The company offers its products and services to drilling contractors and operating companies in approximately 20 countries, primarily in the United Sates, Canada, and Europe. Tesco Corporation was founded in 1966 and is headquartered in Calgary, Canada.


STONE ENERGY CORPORATION (SGY)

Stone Energy Corporation engages in the acquisition, exploration, development, operation, and production of oil and gas in the Gulf of Mexico (GOM), various basins of the Rocky Mountains, and Williston basin oil of North Dakota and Montana. It also owns properties in Howard Ranch Field in the northern Wind River Basin of Wyoming and approximately 47,000 net acres of deep rights below the Monument Butte Field in the Uinta Basin of Utah. The company's property base consists of 79 active properties, 58 in the Gulf Coast Basin and 21 in the Rocky Mountains, and 58 primary term leases in GOM. As of December 31, 2004, it had estimated proved reserves of approximately 825 billion cubic feet of gas equivalent. The company is headquartered in Lafayette, Louisiana.


EVERGREEN ENERGY INC (EEE)

Evergreen Energy, Inc., together with its subsidiaries, provides energy, environmental, and economic solutions to industrial and public utility markets in the United States and internationally. Its K-Fuel process uses heat and pressure to physically and chemically transform high moisture and low-Btu coals, such as subbituminous coal and lignite, into lower-emission fuel. The K-Fuel process also reduces mercury content, sulfur dioxide, nitrous oxides, and carbon dioxide emissions. In addition, Evergreen licenses its technology to third parties. The company was founded in 1981. It was formerly known as KFx, Inc. and changed its name to Evergreen Energy, Inc. in 2006. Evergreen is headquartered in Denver, Colorado.


ENTERPRISE PRODUCTS PARTNERS L.P (EPD)

Enterprise Products Partners L.P., a North American midstream energy company, provides various services to producers and consumers of natural gas and natural gas liquids (NGL). The company operates in four segments: Offshore Pipelines and Services, Onshore Natural Gas Pipelines and Services, NGL Pipelines and Services, and Petrochemical Services. The Offshore Pipelines and Services owns and operates approximately 1,150 miles of offshore natural gas pipelines, approximately 800 miles of Gulf of Mexico offshore crude oil pipeline systems and 7 multipurpose offshore hub platforms located in the Gulf of Mexico, as of December 31, 2004. The Onshore Natural Gas Pipelines and Services segment owns or has interests in approximately 17,200 miles of onshore natural gas pipeline systems that provide for the gathering and transmission of natural gas in Alabama, Colorado, Louisiana, Mississippi, New Mexico, and Texas. In addition, it owns two salt dome natural gas storage facilities located in Mississippi. The NGL Pipelines and Services segment includes the natural gas processing business and related NGL marketing activities; NGL pipelines aggregating approximately 12,775 miles and related storage facilities; and NGL fractionation facilities located in Texas and Louisiana. The Petrochemical Services segment includes four propylene fractionation facilities, an isomerization complex, and an octane additive production facility. This segment also includes various petrochemical pipeline systems. Enterprise Products Partners was formed in 1968 and is headquartered in Houston, Texas.


MCDERMOTT INTERNATIONAL INC (MDR)

McDermott International, Inc., through its subsidiaries, provides engineering, procurement, and project management services for customers involved in the production of energy worldwide. The company operates in three business segments: Marine Construction Services, Government Operations, and Power Generation Systems. The Marine Construction Services segment's principal activities include the front-end and detailed engineering, fabrication, and installation of offshore drilling and production facilities, and installation of marine pipelines and subsea production systems. It operates in the United States, Gulf of Mexico, Mexico, South America, the Middle East, India, the Caspian Sea, and Asia Pacific. The Government Operations segment supplies nuclear components and provides various services, including uranium processing, environmental site restoration services, and management and operating services for the United States government-owned facilities, primarily within the nuclear weapons complex of the U.S. Department of Energy. The Power Generation Systems segment provides various services, equipment, and systems to generate steam and electric power. The company was formed in 1923 under the name J. Ray McDermott and changed its name to McDermott International, Inc. in 1983. McDermott International is based in New Orleans, Louisiana.


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.


ASHLAND INC (ASH)

Ashland, Inc. operates as a chemical and transportation construction company worldwide. It has four segments: APAC, Ashland Distribution, Ashland Specialty Chemical, and Valvoline. The APAC segment provides construction, maintenance and repair, site preparation, materials, and technical services in the southern and midwestern United States. The Ashland Distribution segment distributes chemicals, plastics, composite materials, and environmental services in North America. It also distributes thermoplastics in Europe. The Ashland Specialty Chemical segment supplies specialty chemicals, including composite polymers, casting solutions, drew industrial, drew marine, and specialty polymers and adhesives to various industries, such as adhesives, automotive, composites, metal casting, merchant marine, paint, paper, plastics, watercraft, and water treatment. The Valvoline segment produces and markets packaged motor oil and automotive chemicals, including appearance products, antifreeze, filters, and automotive fragrances. It also provides fast oil change services through Valvoline Instant Oil Change outlets. Ashland was founded in 1918 and is headquartered in Covington, Kentucky.


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.


OCEANEERING INTERNATIONAL INC (OII)

Oceaneering International, Inc. provides technical services and hardware to oil and gas, telecommunications, aerospace, marine engineering, and construction companies, as well as to government agencies worldwide. It offers underwater services and products to the oil and gas industry. These products include remotely operated vehicles, mobile offshore production systems, built-to-order specialty hardware, engineering and project management, subsea intervention systems, nondestructive testing and inspection, and manned diving. The company provides underwater intervention, engineering services, and related manufacturing for various industrial requirements, including ship and submarine husbandry, search and recovery, commercial and government subsea cable field support, maintenance and repair, civil works projects, and commercial theme park equipment and engineering support services for the space industry. Oceaneering International also designs and manufactures subsea control valves, topside control valves, subsea chemical injection valves, and specialty control panels; as well as manufactures metal seal piping connectors and supplies onsite machining services. In addition, it performs subsea intervention and hardware installation services, including subsea well tie-backs; pipeline/flowline tie-ins and repairs; pipeline crossings; umbilical and other subsea equipment installation; subsea intervention; oilfield diving; and supporting operations of vessels. The company operates in the United States, the United Kingdom, North Sea, west Africa, Brazil, Norway, Australia, and Asia. Oceaneering International was founded in 1965 and is based in Houston, Texas.


PETROCHINA COMPANY LIMITED (PTR)

PetroChina Company Limited engages in various petroleum and natural gas related activities in China. It engages in the exploration, development, production, and sale of crude oil and natural gas; refining, transportation, storage, and marketing of crude oil and petroleum products; and production and marketing of basic petrochemical products, derivative chemical products, and other chemical products. The company also engages in the transmission and storage of crude oil, refined products, and natural gas. PetroChina markets various refined products, including gasoline, diesel, kerosene, and lubricants. Its chemical products include basic petrochemicals, such as propylene, ethylene, and benzene; synthetic resins, such as polyethylene and polypropylene; synthetic fibers, such as polyacrylic and terylene fiber; and synthetic rubbers, such as butadiene styrene rubber; alkylbenzene; and urea and ammonium nitrate. As of December 31, 2004, the company owned and operated regional natural gas pipeline networks consisting of 18,995 kilometers of pipelines; a crude oil pipeline network consisting of 9,167 kilometers of pipelines; and a refined product pipeline network consisting of 2,460 kilometers of pipelines. It had estimated proved reserves of approximately 10,940.5 million barrels of crude oil and approximately 44,553.6 billion cubic feet of natural gas, as of the above date. The company also owned and operated a retail distribution network consisting of 14,039 service stations and 2,937 franchise service stations, as of the above date. PetroChina is headquartered in Beijing, China. PetroChina Company Limited is a majority owned subsidiary of China National Petroleum Corporation.


HOLLY CORPORATION (HOC)

Holly Corporation operates an independent petroleum refiner that engages in the refining, transportation, terminalling, and marketing of petroleum products. The company's activities are segregated into Refining and Pipeline Transportation segments. Refining segment involves the refining of crude oil and wholesale marketing of refined products, such as gasoline, diesel fuel, and jet fuel. The petroleum products produced by the segment are marketed in the southwestern United States, Utah, Wyoming, Montana, and northern Mexico. It also includes the company's 49% interest in NK Asphalt Partners, which manufactures and markets asphalt and asphalt products in Arizona and New Mexico. Pipeline Transportation segment includes approximately 500 miles of the company's pipeline assets in Texas and New Mexico. It principally engages in the pipeline transportation, rental, and terminalling operations. The segment also includes the company's 70% interest in Rio Grande Pipeline Company, which provides petroleum products transportation. In addition, the company engages in the exploration and production of oil and gas. It owns and operates three refineries, including Navajo Refinery in New Mexico; a refinery in Woods Cross, Utah; and a refinery in Great Falls, Montana, as well as owns and operates nine refined product storage terminals in Artesia, Moriarty, Bloomfield, and Lovington, New Mexico; El Paso, Texas; Woods Cross, Utah; Great Falls, Montana; Spokane, Washington; and Mountain Home, Idaho. The company owns interests in four refined product storage terminals in Albuquerque, New Mexico; Tucson, Arizona; and Burley and Boise, Idaho. It owns or leases approximately 2,000 miles of pipeline located principally in west Texas and New Mexico. The company was incorporated in Delaware in 1947 and has principal executive offices in Dallas, Texas.


NEWPARK RESOURCES INC (NR)

Newpark Resources, Inc. provides fluids management, environmental, and oilfield services to the oil and gas exploration and production industry. It offers drilling fluids, and associated engineering and technical services; installs, rents, and sells hardwood and composite interlocking mats that are used for temporary access roads and work sites in oilfield and other construction applications; and processes and disposes oilfield exploration and production waste, and nonhazardous industrial waste; and sells lumber, timber, wood chips, bark, and sawdust. The company also provides other services for the oil and gas exploration and production industry, which include oilfield construction services, including hooking-up and connecting wells, installing production equipment, and maintaining the production site and facilities; waste pit design, construction, and installation; regulatory compliance assistance; and site remediation and closure. In addition, Newpark Resources engages in sourcing, processing, packaging, and the distributing minerals used for fillers/extenders in paint, plastics, ceramics, and oil service end products. The company primarily operates in the Louisiana and Texas Gulf Coast, the United States mid-continent, and United States Rocky Mountains, as well as in western Canada and the Mediterranean regions. Newpark was founded in 1932 and is based in Metairie, Louisiana. Newpark Resources, Inc. acquired OLS Consulting Services, Inc. in April 2005.


PARALLEL PETROLEUM CORPORATION (PLLL)

Parallel Petroleum Corporation engages in the acquisition, development, and exploitation of oil and natural gas properties in Texas and New Mexico. The company produces and sells oil and natural gas. It has properties located in the Permian Basin of west Texas and New Mexico; Liberty County in east Texas; and in the onshore Gulf Coast area of south Texas. The company's properties in the Permian Basin of west Texas include Fullerton San Andres field located in Andrews County; Carm-Ann San Andres Field/N. Means Queen Unit, located in Andrews and Gaines Counties; and Diamond M Canyon Reef Unit in Scurry County. Its properties in onshore Gulf Coast area of south and north Texas comprise Yegua/Frio Gas project, located in Jackson and Wharton Counties; Cook Mountain Gas project, which is located in Liberty County; and Barnett Shale Gas project, located in Tarrant County. In addition, the company is evaluating, leasing, drilling, and preparing to drill new projects located in New Mexico, the Fort Worth Basin of Texas, the Cotton Valley Reef trend of east Texas, and the Uinta Basin of Utah. As of December 31, 2004, it had net proved reserves of approximately 18.9 million barrels of oil or other liquid hydrocarbons and 16.8 billion cubic feet of natural gas. Parallel Petroleum Corporation was founded in 1979 and is headquartered in Midland, Texas.


LUFKIN INDUSTRIES INC (LUFK)

Lufkin Industries, Inc. and its subsidiaries engage in the design, manufacture, sale, and service of oil field pumping units, power transmission products, and highway trailers worldwide. Its oil field products include artificial reciprocating rod lift equipment and related products, which are used to extract crude oil and other fluids from wells. The power transmission products consist of high-speed and low-speed speed increasing and reducing gearboxes for industrial applications. The company's highway trailers comprise van, float, and dump trailers for the freight-hauling market. Lufkin Industries primarily sells its products to oil and gas companies and various industries, as well as to small and medium size fleet freight-hauling companies. It operates in the United States, Europe, Canada, and Latin America. The company was founded in 1902 and is based in Lufkin, Texas.


COMSTOCK RESOURCES INC (CRK)

Comstock Resources, Inc. engages in the acquisition, development, production, and exploration of oil and natural gas primarily in the Gulf of Mexico, Texas, Louisiana, Oklahoma, Arkansas, and Kansas. As of December 31, 2004, the company had proved oil and natural gas reserves of 628.8 billion cubic feet of natural gas equivalent, and owned interests in 1,356 producing oil and natural gas wells. Comstock Resources is headquartered in Frisco, Texas.


OMNI ENERGY SERVICES CORP (OMNI)

OMNI Energy Services Corp. operates as an integrated oilfield service company. It provides onshore seismic drilling, permitting, survey, and helicopter support services; helicopter transportation services; and environmental cleaning services in the United States and the Gulf of Mexico. The company operates in three divisions: Seismic Drilling, Aviation Services; and Environmental Services. The Seismic Drilling division principally operates in the marsh, swamp, shallow water, and contiguous dry land areas along the Gulf Coast, primarily in Louisiana and Texas. It also owns and operates a fleet of seismic drilling and transportation equipment for use in the transition zone. The Aviation Services division operates company-owned and leased helicopters, and fixed-wing aircraft from bases or heliports located in the Gulf Coast regions of Louisiana. As of March 31, 2005, it operated a fleet of 20 company-owned and leased helicopters, and 1 fixed-wing aircraft. This division primarily serves geophysical companies in the United States, and oil and gas companies that operate in the shallow waters of the Gulf of Mexico. The Environmental Services division provides dock-side and offshore nonhazardous oilfield waste management and environmental cleaning services, including drilling rig, tank and vessel cleaning, safe vessel entry, naturally occurring radioactive material decontamination, platform abandonment services, pipeline flushing, gas dehydration, and hydro blasting. The company was founded in 1987 and is headquartered in Carencro, Louisiana.


CORE LABORATORIES N.V (CLB)

Core Laboratories N.V. provides proprietary and patented reservoir description, production development, and reservoir management products and services to the oil and gas industry worldwide. The company provides analytical and field services to characterize properties of crude oil and petroleum products to the oil and gas industry. It also offers products and services relating to reservoir well completions, perforations, stimulations, and production. In addition, the company provides integrated services to evaluate well completions and to develop solutions for the oil recovery projects. Further, Core Laboratories combines and integrates information from reservoir description and production development services. As of March 31, 2005, it operated approximately 70 offices in 50 countries. The company was established in 1936 and is based in Amsterdam, the Netherlands.


BRIGHAM EXPLORATION COMPANY (BEXP)

Brigham Exploration Company engages in the exploration and development of onshore domestic oil and natural gas properties using 3-D seismic imaging and other technologies. The company's exploration and production activities are focused primarily in the onshore Texas Gulf Coast, the Anadarko Basin of northwest Oklahoma and the Texas Panhandle, and west Texas. Brigham Exploration also operates gas gathering systems. It sells its oil and natural gas to intrastate pipeline purchasers, operators of processing plants, and marketing companies. Brigham Exploration was founded in 1990 and is headquartered in Austin, Texas.


MERIDIAN RESOURCE CORPORATION (TMR)

The Meridian Resource Corporation engages in the exploration for, acquisition, development, and production of oil and natural gas reserves. It principally operates on the onshore oil and gas regions in south Louisiana, the Texas Gulf Coast, and offshore in the Gulf of Mexico. As of December 31, 2004, the company had approximately 139 billion cubic feet of natural gas equivalent proved reserves. It had interests in leases and options to lease acreage in approximately 300,000 gross acres. As of the above date, the company had interest in 35 oil wells and 68 natural gas wells. Meridian Resource was initially organized in 1985 as a master limited partnership and was converted into a Texas corporation in 1990. The company is headquartered in Houston, Texas.


DRIL-QUIP INC (DRQ)

Dril-Quip, Inc. manufactures offshore drilling and production equipment for the exploration of oil and gas on offshore drilling rigs. The company's principal products include subsea and surface wellheads, subsea and surface production trees, mudline hanger systems, specialty connectors and associated pipe, drilling and production riser systems, and wellhead connectors and diverters for use by national oil and gas companies. It also provides installation and reconditioning services, and rents running tools for use in connection with the installation and retrieval of its products. Dril-Quip markets its products through its sales personnel, as well as through independent sales representatives worldwide. The company was co-founded by Larry E. Reimert, Gary D. Smith, J. Mike Walker, and Gary W. Loveless in 1981. Dril-Quip is headquartered in Houston, Texas.


SWIFT ENERGY COMPANY (SFY)

Swift Energy Company engages in the exploration, development, acquisition, and operation of oil and natural gas properties. It primarily focuses on inland waters, and onshore oil and natural gas reserves in Louisiana and Texas, as well as on oil and natural gas reserves in New Zealand. Its properties include AWP Olmos, south Texas; Brookeland, east Texas; Lake Washington, south Louisiana; Masters Creek, central Louisiana; Rimu/Kauri, New Zealand; and TAWN, New Zealand. As of December 31, 2004, the company had estimated proved reserves of 799.8 billions cubic feet of natural gas equivalent, as well as 932 natural gas producing wells. The company was founded in 1979 and is headquartered in Houston, Texas.


GOODRICH PETROLEUM CORPORATION (GDP)

Goodrich Petroleum Corporation and subsidiaries engage in the exploration, exploitation, development, and production of oil and natural gas. It primarily focuses on the Cotton Valley trend of east Texas and northwest Louisiana, and the transition zone of south Louisiana. The company owns working interests in 89 active oil and gas wells located in 18 fields in 4 states. Goodrich has interests in the Dirgin-Beckville, North Minden, South Henderson, and Bethany-Longstreet fields in the Cotton Valley trend of east Texas and northwest Louisiana. Its south Louisiana operations consist of Burrwood/West Delta 83 fields, Plumb Bob fields, and St. Gabriel fields. In addition, the company has interests in Mary Blevins field, and Marholl and Sean Andrew fields in eastern and southern regions of Texas. As of December 31, 2004, Goodrich had approximately 5.6 million barrels of oil proved reserves and 67.7 billion cubic feet of natural gas proved reserves. The company is headquartered in Houston, Texas.


KINDER MORGAN ENERGY PARTNERS L.P (KMP)

Kinder Morgan Energy Partners, L.P. engages in the ownership and management of a portfolio of energy transportation and storage assets principally in the United States. The company operates through four segments: Products Pipelines, Natural Gas Pipelines, CO2, and Terminals. The Products Pipelines segment delivers gasoline, diesel fuel, jet fuel, and natural gas liquids to various markets through approximately 10,000 miles of products pipelines and 60 associated terminals. Natural Gas Pipelines segment transports, stores, and sells natural gas through approximately 14,000 miles of natural gas transmission pipelines and gathering lines, as well as natural gas gathering and storage facilities. CO2 segment produces, transports, and markets carbon dioxide, CO2, through pipelines to oil fields that use CO2 to increase production of oil. It owns interests in six oil fields in West Texas, and owns and operates a crude oil pipeline system in West Texas. The Terminals segment transloads, stores, and delivers a range of bulk, petroleum, and petrochemical products through approximately 75 owned or operated liquid and bulk terminal facilities and 55 rail transloading and materials handling facilities in the United States. Kinder Morgan, G.P., Inc. serves as the general partner of the company. Kinder Morgan Energy Partners was formed in 1992 and is based 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.


REPSOL YPF S.A (REP)

Repsol YPF, S.A. engages in the exploration, development, and production of crude oil and natural gas primarily in Spain and Argentina. The company also involves in the transportation of petroleum products, liquefied petroleum gas (LPG), and natural gas; petroleum refining; petrochemical production; and marketing of petroleum products, petroleum derivatives, petrochemicals, and LPG and natural gas, as well as in the generation of electricity. As of December 31, 2004, it had 1,683,190 thousands of barrels of crude oil, 18,207,112 millions of cubic feet of gas. As of December 31, 2004, Repsol operated 3,616 service stations and gas pumps in Spain and 3,297 service stations and gas pumps outside Spain. The company was organized in 1986. It was formerly known as Repsol, S.A. and changed its name to Repsol YPF, S.A. in 2000. Repsol is based in Madrid, Spain.


ATP OIL & GAS CORPORATION (ATPG)

ATP Oil & Gas Corporation engages in the acquisition, development, and production of oil and natural gas properties in the Gulf of Mexico and the North Sea. The company had leasehold and other interests in 52 offshore blocks; 26 platforms; and 68 wells, including 5 subsea wells in the Gulf of Mexico, as well as in 10 blocks and 1 company-operated subsea well in the North Sea, as of December 31, 2004. It had leasehold interests in the Gulf of Mexico and the North Sea covering approximately 317,028 gross and 249,361 net acres, as of the above date. As of December 31, 2004, the company had estimated net proved reserves of 275.2 billion cubic feet equivalent, of which approximately 180.7 billion cubic feet equivalent was in the Gulf of Mexico and 94.5 billion cubic feet equivalent was in the North Sea. These reserves comprised of 205.2 billion cubic feet equivalent of natural gas and 11.7 million barrels of oil. ATP Oil & Gas was founded by T. Paul Bulmahn in 1991. The company is based in Houston, Texas.


MAGELLAN PETROLEUM CORPORATION (MPET)

Magellan Petroleum Corporation engages in the exploration, development, production, and sale of oil and gas reserves. The company, through its subsidiary, Magellan Petroleum Australia Limited, owns interest in various properties, including Mereenie Oil and Gas Field, Palm Valley Gas Field, Nockatunga Oil Fields, Dingo Gas Field, Browse Basin, Maryborough Basin, and Cooper/Eromanga Basin in Australia. It also holds interest in various oil and gas properties in New Zealand and the United Kingdom. In addition, the company has a 2.67% direct interest in the Kotaneelee gas field in the Yukon Territory of Canada. Magellan Petroleum Corporation was incorporated in 1957 and is based in Hartford, Connecticut.


CLAYTON WILLIAMS ENERGY INC (CWEI)

Clayton Williams Energy, Inc. engages in the exploration, development, acquisition, and production of oil and natural gas in the United States. It has interests primarily in the Permian Basin, Louisiana; Black Warrior Basin in Mississippi; and the Austin Chalk and Cotton Valley Reef of Texas. As of December 31, 2004, the company's total estimated proved reserves were 138.3 billion cubic feet of natural gas; and 26.8 million barrels of oil and natural gas liquids. As of the above date, Clayton had interests in 886.9 net oil and gas wells, and owned leasehold interests in approximately 388,000 net undeveloped acres. In addition, it operates natural gas service facilities, which comprise pipelines, treating plants, dehydration facility, and compressor stations. The company principally operates in Texas, Louisiana, New Mexico, and Mississippi. Clayton was incorporated in 1991 and is headquartered in Midland, Texas.


PENN VIRGINIA CORPORATION (PVA)

Penn Virginia Corporation engages in the exploration, development, and production of oil and natural gas primarily in the eastern and Gulf Coast onshore areas of the United States. The company operates through four segments: Oil and Gas Operations, Coal Royalty and Land management Operations, Natural Gas Midstream, and Corporate and other. As of December 31, 2004, the Oil and Gas Operations segment had proved reserves of approximately 6.3 million barrels of oil and condensate and 316 billion cubit feet of natural gas, or 354 billion cubit feet equivalent. Coal Royalty and Land management Operations segment, through, Penn Virginia Resource Partners, L.P., engages in the ownership and management of coal properties. As of the above date, the segment had 558 million tons of proven and probable coal reserves. Natural Gas Midstream segment engages in gas processing, gathering, and other related services. Corporate and Other segment primarily represents corporate functions. Penn Virginia Corporation was founded in 1882 and is headquartered in Radnor, Pennsylvania.


ENI S.P.A (E)

Eni SpA engages in the oil and gas, electricity generation, petrochemicals, oilfield services, and engineering industries. Eni engages in the exploration and production of hydrocarbons in Italy, North Africa, West Africa, the North Sea, the Gulf of Mexico, South America, the Caspian Sea, the Middle and Far East, and Australia. As of December 31, 2004, the company's proved reserves of hydrocarbons were 7,218 million barrel of oil equivalent. It supplies, transports, distributes, and sells natural gas in Italy and in the rest of Europe. As of December 31, 2004, the company owned 30,545 kilometers natural gas transmission system in Italy. Eni also owned power stations in Brindisi, Ferrera Erbognone, Livorno, Mantova, Ravenna, Ferrara, and Taranto with an installed capacity of approximately 3.3 gigawatts. Eni refines and sells refined products principally in Italy. It provides petrochemical products that include olefins and aromatics, basic intermediate products, chlorine derivatives, polystyrene, elastomers, and polyethylene. The company markets its refined petroleum products through direct sales network, franchises, and other distribution systems. It also engages in the laying of underwater pipelines; and installation of offshore platforms and floating production storage and offloading systems in onshore construction; and onshore and offshore drilling. In addition, Eni engages in engineering and contracting in the area of plants for hydrocarbon production, treatment, and transmission; the liquefaction and treatment of natural gas; natural gas upgrading; the conversion of heavy residues from conventional and nonconventional crudes; the chemical industry; power generation; infrastructure; and environmental protection. The company was established as Ente Nazionale Idrocarburi, a public law agency, in 1953. It was transformed into a joint stock company and changed its name to Eni SpA in 1992. Eni is headquartered in Rome, Italy.


MCMORAN EXPLORATION COMPANY (MMR)

McMoRan Exploration Co. engages in the exploration, development, and production of oil and gas offshore in the Gulf of Mexico and in the Gulf Coast region. As of December 31, 2004, it owned or controlled interests in 98 oil and gas leases in the Gulf of Mexico, and onshore Louisiana and Texas covering approximately 252,000 gross acres. The company also owns 100% of the oil operations at Main Pass Block 299, through a joint venture with K-Mc Ventures I, L.L.C. It is also developing the Main Pass Energy Hub project, which includes the conversion of its former Main Pass sulphur facilities into a hub for the receipt and processing of liquefied natural gas, and the storage and distribution of natural gas. As of December 31, 2004, it had proved developed and undeveloped gas reserves of 14,765 million cubic feet (MMcf) and 6,422 MMcf respectively; and proved developed and undeveloped oil reserves of 4,640,475 barrels and 148,660 barrels respectively. The company was founded in 1994 and is headquartered in New Orleans, Louisiana.


BERRY PETROLEUM COMPANY (BRY)

Berry Petroleum Company engages in the production, development, acquisition, exploration, and exploitation of crude oil and gas in the United States. The company owns and operates working interests in 38 properties consisting of 4,528 acres located in the Midway-Sunset field; the McVan property, which consists of 560 acres in the Poso Creek field; 9 leases and 4 fee properties totaling approximately 965 acres in the Placerita field; and a 100% working interest in 6 leases totaling 8,563 acres in the Montalvo field in California. It also has interests in the Brundage Canyon leasehold in Duche sne County, Utah that consists of leases totaling approximately 47,300 gross acres; a 52% working interest in properties located in the Niobrara field in northeastern Colorado comprising approximately 127,000 gross acres; and working interests in approximately 390,000 gross prospective acres located in eastern Colorado, western Kansas, and southwestern Nebraska. In addition, the company holds a 15.83% nonoperated working interest in the South Joe Creek coalbed methane field, which represents interests in leases totaling 5,106 acres in the northeastern portion of the Powder River Basin in Wyoming; holds 163,000 net acres in eastern Kansas; and holds 55,000 net acres in central Illinois. As of December 31, 2004, Berry Petroleum had proved developed reserves of 78,207 Mbbls of oil and 20,048 Mmcf of gas. The company markets its crude oil to independent marketers and oil refining companies. Berry Petroleum was founded by Clarence J. Berry in 1909. The company is headquartered in Bakersfield, California.


PLAINS ALL AMERICAN PIPELINE L.P (PAA)

Plains All American Pipeline, L.P., through its subsidiaries, engages in the transportation of crude oil; marketing, terminalling, and storage of crude oil; and marketing and storage of liquefied petroleum gas (LPG) and natural gas-related petroleum products in North America. As of December 31, 2004, it owned approximately 15,000 miles of crude oil pipelines located throughout the United States and Canada. The company also owned approximately 37 million barrels of ground crude oil terminalling and storage facilities, as well as approximately 1.7 million barrels of LPG storage, as of the above date. Plains All American Pipeline, L.P. was formed in 1998 and is headquartered in Houston, 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.


IMPERIAL OIL LIMITED (IMO)

Imperial Oil Limited operates as an integrated oil company in Canada. The company engages in the exploration, production, and sale of crude oil and natural gas, including upgraded crude oil and crude bitumen; owns and operates four refineries; owns and operates crude oil, natural gas liquids, and products pipelines in Alberta, Manitoba, and Ontario; and markets approximately 700 petroleum products throughout Canada. It also sells gasoline; heating, diesel, and jet fuels; heavy fuel oils; and lube oils and other products to large industrial and commercial accounts, as well as to other refiners and marketers. The company sells its petroleum products through approximately 2,000 Esso service stations, of which about 720 are company owned or leased. In addition, Imperial Oil manufactures and markets various chemicals, including ethylene, benzene, aromatic and aliphatic solvents, plasticizer intermediates, and polyethylene resin. The company was incorporated in 1880 and is headquartered in Toronto, Canada.


ICO INC (ICOC)

ICO, Inc. and its subsidiaries, manufacture specialty resins and concentrates. It also provides toll processing services, including ambient grinding, jet milling, compounding, and ancillary services for polymer resins produced in pellet forms and other materials. The company manufactures specialty resins into a powder form, which are used in the manufacture of household items, such as toys, household furniture, and trash receptacles; automobile parts; agricultural products, such as fertilizer and water tanks; paint; and metal and fabric coatings. Its concentrate products are primarily used by third parties to produce plastic films. The company provides its products and services through its 18 operating facilities located in 9 countries in North America, Europe, Australasia, and South America. Its customers include chemical companies, polymer production affiliates of major oil exploration and production companies, and manufacturers of plastic products. The company was incorporated in 1978 and is headquartered in Houston, Texas.


THE EXPLORATION COMPANY (TXCO)

Exploration Company of Delaware, Inc. engages in the acquisition, exploration, development, and production of oil and gas properties. As of December 31, 2004, it had proved reserves of 17.7 Bcf of natural gas and 3.4 MMBbls of oil. As of the same date, the company completed drilling of 52 wells, including 27 oil wells in the San Miguel, Georgetown, Glen Rose, and Red River formations; and 25 gas wells in the Glen Rose, Georgetown, and Pearsall formations in southwest Texas. The company also owns properties in South Dakota, North Dakota, and Montana. The company was incorporated in 1979 and is headquartered in San Antonio, Texas.


WILLBROS GROUP INC (WG)

Willbros Group, Inc. operates as an independent international contractor serving the oil, gas, and power industries, as well as government entities worldwide. The company provides construction, engineering, and specialty services. Its construction services include construction and replacement of large-diameter cross-country and offshore pipelines; fabrication of engineered structures and process modules and facilities; construction of oil and gas production facilities, pump stations, flow stations, gas compressor stations, gas processing facilities, and other related facilities; and building of offshore platforms, subsea facilities, piers, docks, and bridges. Willbros Group provides these services for onshore, coastal, and offshore locations. Its engineering services comprise feasibility studies, conceptual and detailed engineering services, field services and material procurement, and project management. The company's specialty services include dredging, pipe coating, concrete weight coating, pipe double-jointing, piling, pressure vessels, marine heavy lift services, transport of dry and liquid cargo, rig moves, maintenance and repair services, and facilities development and operations. In addition, Willbros Group provides various field services, including surveying, acquisition, material receiving and control, construction inspection, facilities startup assistance, and facilities operations. The company was founded in 1908 and is headquartered in Panama City, Panama.


ABRAXAS PETROLEUM CORPORATION (ABP)

Abraxas Petroleum Corporation, an independent energy company, engages in the acquisition, development, and production of crude oil and natural gas. It primarily operates in the Texas Gulf Coast, the Permian Basin of western Texas, and Wyoming. The company operates in the Portilla field in San Patricio County, the Wilcox in Goliad County; and the Edwards trend in DeWitt and Live Oak Counties in south Texas; and the Delaware Basin in Ward, Reeves, and Pecos Counties, the Eastern Shelf in Scurry, Mitchell, and Coke Counties; and the Midland Basin in Howard, Martin, and Dawson Counties in the Permian Basin of west Texas. Abraxas has interests in the Powder River Basin in Converse and Niobrara Counties in Wyoming. As of January 1, 2005, it had 3,101 thousand barrels of total proved crude oil reserves and 75,118 million cubic feet of natural gas proved reserves. The company was established in 1977 and is based in San Antonio, Texas.


FX ENERGY INC (FXEN)

FX Energy, Inc. engages in the exploration, development, and production of oil and gas properties in the Republic of Poland and the United States. The company's projects comprise the exploration and exploitation of oil and gas prospects in association with the Polish Oil and Gas Company and other industry partners. Its activities in Poland are conducted in four project areas: Fences I, Fences II, Fences III, and Wilga. The company produces oil from fields in Cut Bank, Bears Den, and Rattlers Butte properties in Montana; and Trap Spring, Munson Ranch, and Bacon Flat properties in Nevada. It also has an oilfield services company in northern Montana that performs contract drilling and well services, including drilling, workovers, location work, cementing, and acidizing in the United States. As of December 31, 2004, it had proved reserves of 809 thousand oilfield barrels of oil in the United States, as well as 111 thousand oilfield barrels of oil and 10,198 million cubic feet of natural gas in Poland. FX Energy has a strategic relationship with the Polish Oil and Gas Company. The company is based in Salt Lake City, Utah.


CALLON PETROLEUM COMPANY (CPE)

Callon Petroleum Company engages in the exploration, development, acquisition, and production of oil and gas properties. Its properties are primarily located offshore in the Gulf of Mexico and onshore in Louisiana and Alabama. As of December 31, 2004, the company owned working interests in a total of 72 blocks/leases covering 145,000 net acres and had estimated net proved reserves of 191 billion cubic feet of natural gas equivalent. Callon Petroleum was founded in 1950 and is headquartered in Natchez, Mississippi.


CHINA PETROLEUM & CHEMICAL CORPORATION (SNP)

China Petroleum & Chemical Corporation engages in the exploration, development, and production of oil and natural gas in the People's Republic of China. It also sells and distributes refined petroleum products, as well as operates oil refineries. As of December 31, 2004, the company had proved reserves of approximately 3,267 million barrels of crude oil and 3,033 billion cubic feet of natural gas. In addition, it produces a range of petrochemical products, including intermediate petrochemicals, synthetic resins, synthetic fiber monomers and polymers, synthetic fibers, synthetic rubber and chemical fertilizers. China Petroleum & Chemical Corp. has a joint venture agreement with Mitsui Chemicals, Inc. and BP plc. The company was founded in 2000 and is headquartered in Beijing, the People's Republic of China.


BUCKEYE PARTNERS L.P (BPL)

Buckeye Partners, L.P., through its subsidiaries, engages in the transportation, terminalling, and storage of refined petroleum products for integrated oil companies, refined product marketing companies, and end users of petroleum products in the United States. It also operates pipelines owned by third parties under contracts with integrated oil and chemical companies. In addition, the company provides engineering and construction management services to chemical companies in the Gulf Coast area. Further, Buckeye Partners provides pipeline transportation service to Reno/Tahoe International and San Diego International airports. As of December 31, 2004, it owned 2,643 miles common carrier refined petroleum products pipeline serving nine states; 345-mile common carrier refined products pipeline located principally in Pennsylvania; 422-mile pipeline in Indiana, Illinois, and Ohio; and 37 miles of refined petroleum products pipeline in Florida. The company was founded in 1986 and is based in Emmaus, Pennsylvania.


TEPPCO PARTNERS L.P (TPP)

TEPPCO Partners, L. P., through its subsidiaries, primarily engages in the ownership and operation of common carrier pipelines of refined petroleum products and liquefied petroleum gases in the United States. The company also owns and operates petrochemical and natural gas liquid pipelines; owns and operates natural gas gathering systems; and owns 50% interests in Seaway Crude Pipeline Company, Centennial Pipeline LLC, and Mont Belvieu Storage Partners, L.P. The company operates in three segments: Downstream, Upstream, and Midstream. Its Downstream segment transports, stores, and provides terminal services for petroleum products; transports liquefied petroleum gases in the Mont Belvieu area; transports petrochemicals in southeast Texas; and provides other ancillary services. Its customers primarily include major integrated oil companies, independent oil companies, the airline industry, and wholesalers. The company's Upstream segment gathers, transports, markets, and stores crude oil, as well as distributes lubrication oils and specialty chemicals principally in Oklahoma, Texas, New Mexico, and the Rocky Mountain region. Its customers primarily include major integrated oil companies and independent refiners. The Midstream segment gathers natural gas in the Green River Basin in southwestern Wyoming, and in the San Juan Basin in northwestern New Mexico and southwestern Colorado; transports natural gas liquids (NGLs) from southeastern New Mexico, east Texas, and west Texas to Mont Belvieu, Texas; and fractionates NGLs at two facilities in Colorado. Its customers include major integrated oil and gas companies, and large to medium-sized independent producers. Texas Eastern Products Pipeline Company, LLC serves as the general partner of the company. TEPPCO Partners was founded in 1989 and is based in Houston, Texas.


DAWSON GEOPHYSICAL COMPANY (DWSN)

Dawson Geophysical Company provides onshore seismic data acquisition services in the United States. The company acquires and processes two dimensional, three dimensional, and multicomponent seismic data for oil and gas companies and independent oil and gas operators, as well as providers of multiclient data libraries. It offers geophysical services, data acquisition, data processing, and integrated services. Dawson's two dimensional method involves the collection of seismic data in a linear fashion thus generating a single plane of subsurface seismic data. The three dimensional method produces seismic data, which produces images of the earth's subsurface. Geophysicists use computers to interpret three dimensional seismic data volumes, generate geologic models of the earth's subsurface, and identify subsurface anomalies that are favorable for the accumulation of hydrocarbons. As of September 30, 2005, the company operated 11 seismic data acquisition crews in the United States and a seismic data processing center. Dawson Geophysical was founded by L. Decker Dawson in 1952 and is headquartered in Midland, Texas.


TENGASCO INC (TGC)

Tengasco, Inc. engages in the exploration, production, and transportation of oil and natural gas in Tennessee and Kansas. It also leases producing and nonproducing properties for exploration and development. The company has interests in 129 producing oil wells and 51 producing gas wells in the vicinity of Hays, Kansas; and 22 producing gas wells and 5 producing oil wells in the Swan Creek Field, Tennessee. Tengasco markets its crude oil to local refining companies, local utilities, and private industry end-users; and natural gas to local utilities, private industry end-users, and natural gas marketing companies. The company was founded as Gold Deposit Mining & Milling Company in 1916 and changed its name to Onasco Companies, Inc. Further, Onasco Companies changed its name to Tengasco, Inc. in 1995. Tengasco is headquartered in Knoxville, Tennessee.


BLUE DOLPHIN ENERGY COMPANY (BDCO)

Blue Dolphin Energy Company, through its subsidiaries, engages in the gathering and transportation of natural gas and condensate, as well as in the development of oil and gas properties in the United States. The company operates in two segments, Pipeline Transportation Services, and Oil and Gas Exploration and Production. The Pipeline Transportation Services comprise offshore and onshore divisions. The offshore division transports gas and liquids and owns approximately 34 miles of 20-inch pipeline from a platform in Galveston Area Block 288 to shore. It also owns a platform and 5 field gathering lines totaling approximately 27 miles, connected to the main 20-inch line. An additional 4 miles of 20-inch pipeline onshore connects the offshore division to the shore facility at Freeport, Texas. The onshore division owns approximately 2 miles of 16-inch pipeline for transportation of gas from the shore facility to a sales point at Freeport, Texas. It also owns the Buccaneer Pipeline, an 8-inch liquids pipeline, which transports crude oil and condensate from the storage tanks to its barge-loading terminal on the Intracoastal Waterway near Freeport, Texas for sale to third parties. The Oil and Gas Exploration and Production segment engages in the exploration, acquisition, development, and operation of oil and gas properties in the western and central Gulf of Mexico. It holds a license to approximately 200 blocks of 3-D seismic data covering 1,152,000 acres in the western Gulf of Mexico and inventory of close grid 2-D seismic data. The company focuses primarily in the geographical areas of Texas and Louisiana Gulf Coast, and the Gulf of Mexico shelf. Blue Dolphin Energy was incorporated in 1986 and is based in Houston, Texas.


ENERGY TRANSFER PARTNERS (ETP)

Energy Transfer Partners, L.P., through its subsidiary, La Grange Acquisition, L.P., engages in the midstream and transportation, and storage of natural gas in the United States. The company's Midstream segment gathers, compresses, treats, processes, and markets natural gas primarily in the Austin Chalk trend of southeast Texas, the Permian Basin of west Texas, the Barnett Shale in north Texas, and the Bossier Sands in east Texas. Its Transportation and Storage segment transports natural gas from various natural gas producing areas through connections with other pipeline systems, as well as through the company's Oasis Pipeline, East Texas Pipeline, Fort Worth Basin Pipeline, and Houston Pipeline System. As of August 31, 2005, Energy Transfer Partners owned and operated 11,700 miles of natural gas gathering and transportation pipelines, 3 natural gas processing plants, 14 natural gas treating facilities, and 3 natural gas storage facilities. In addition, through its other subsidiary, Heritage Operating, L.P., it engages in the retail marketing of propane in the United States. Energy Transfer Partners GP, L.P. serves as the general partner of the company. Energy Transfer Partners was formed in 2002 and is based in Dallas, Texas.


EATON VANCE SHORT DIVERSIFIED INCOME FUND (EVG)

Eaton Vance Low Duration Diversified Income Fund operates as an organized, diversified, closed-end management investment company. It invests primarily in senior, secured floating rate loans; foreign debt obligations and currency investments; mortgage-backed securities; and below investment grade corporate obligations. Eaton Vance Management, an indirect wholly owned subsidiary of Eaton Vance Corp., is the fund's investment adviser. The fund was organized as a Massachusetts business trust in April 2004 and has principal offices in Boston, Massachusetts.


TOREADOR RESOURCES CORPORATION (TRGL)

Toreador Resources Corporation engages in the exploration, development, production, leasing, and acquisition of oil and natural gas. The company holds rights to explore and develop oil and natural gas properties in the Paris Basin, France; onshore and offshore Turkey; onshore Romania and Hungary; and offshore Trinidad, West Indies. It also owns various working interest properties in Texas, Kansas, New Mexico, Louisiana and Oklahoma. As of December 31, 2004 the company had 8,884 MBbl of proved oil reserves and 4,875 MMcf of natural gas reserves. The company, formerly known as toreador Royalty Corporation, was incorporated in 1951 and is headquartered in Dallas, Texas.


BOLT TECHNOLOGY CORPORATION (BTJ)

Bolt Technology Corporation and its subsidiaries engage in the development, manufacture, and sale of seismic energy sources used in the offshore seismic exploration for oil and gas worldwide. It operates in two segments, Geophysical Equipment and Industrial Products. Geophysical Equipment segment develops, manufactures, and sells marine seismic energy sources and underwater electrical connectors and cables, air gun signature hydrophones, and pressure transducers used by the marine seismic industry. Industrial Products segment develops, manufactures, and sells miniature industrial clutches, brakes, and subfractional horsepower electric motors. These products are used in various applications, including air conditioning systems, valve timers, vending machines, point of purchase displays, and business machines. The company primarily sells its products to marine seismic exploration contractors and original equipment manufacturers. The company was founded in 1960 and is based in Norwalk, Connecticut.


PETROLEUM DEVELOPMENT CORPORATION (PETD)

Petroleum Development Corporation engages in the development, production, and marketing of natural gas in the United States. The company's operations include drilling and development activities, the acquisition of producing natural gas and oil wells, and the expansion of its natural gas marketing activities. The company operates approximately 2,700 wells located in the Appalachian basin, Michigan, and the Rocky Mountain Region, with gross proved reserves of approximately 523 billion cubic feet equivalent of natural gas. The company also purchases, aggregates, and resells natural gas developed by other producers to industrial end-users, utilities, other gas marketers, and other wholesale gas purchasers. Petroleum Development was incorporated in 1955 and is headquartered in Bridgeport, West Virginia.


PRIMUS GUARANTY LTD (PRS)

Primus Guaranty, Ltd., through its principal subsidiary, Primus Financial Products, LLC, sells credit protection against investment grade credit obligations of corporate and sovereign entities. The company, through Primus Asset Management, Inc., manages the credit swap portfolios; and through Primus Re, Ltd., operates as a financial guaranty insurance company. In addition, the company invests in short-term government securities, money-market instruments, and other investment grade securities. Primus Guaranty was incorporated in 1998 and is headquartered in Hamilton, Bermuda.


AMERIGAS PARTNERS L.P (APU)

AmeriGas Partners, L.P., through its subsidiary, distributes propane, and related equipment and supplies in the United States. The company also sells, installs, and services propane appliances, including heating systems and propane fuel systems for motor vehicles. Its propane is used as fire furnaces and cutting gas, supplemental fuel to meet peak load deliverability requirements, and in other process applications, as well as for home heating, water heating, cooking, tobacco curing, chicken brooding, and crop drying purposes. As of September 30, 2005, the company served approximately 1.3 million residential, commercial, industrial, agricultural, wholesale, and motor fuel customers from approximately 650 district locations in 46 states. AmeriGas Propane, Inc. serves as its general partner. AmeriGas Partners, L.P. was formed in 1994 and is based in King of Prussia, Pennsylvania.


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.


INFINITY ENERGY RESOURCES INC (IFNY)

Infinity Energy Resources, Inc., an independent energy company, through its wholly owned subsidiaries, engages in the acquisition, exploration, development, and production of natural gas and oil properties in the United States and Nicaragua. The company operates through two segments, Oil and Gas Production and Oil Field Services. The Oil and Gas Production segment's operations are principally focused in Texas and the Rocky Mountains with the exploration and development of, and production from properties in the Fort Worth, Greater Green River, and Sand Wash Basins. It also has an exploration and production prospect offshore Nicaragua. The Oil Field Services segment provides oilfield services, such as completion, fracturing, and stimulation services to oil and gas producers in the Mid-Continent region, principally including eastern Kansas and northeast Oklahoma, and the Powder River Basin in Wyoming. As of December 31, 2004, the company's total proved reserves were 8.2 billion cubic feet of gas equivalent. The company was organized in 1987. It was formerly known as Infinity, Inc. and changed its name to Infinity Energy Resources, Inc. in September 2005. The company is based in Denver, Colorado.


CONTANGO OIL & GAS COMPANY (MCF)

Contango Oil & Gas Company operates as an independent natural gas and oil company. It engages in the exploration, development, production, and acquisition of natural gas and oil properties primarily offshore in the Gulf of Mexico, the Fayetteville Shale in Arkansas, and onshore along the Gulf Coast. The company also has a 10% partnership interest in Freeport LNG Development, L.P., which develops a liquefied natural gas receiving terminal in Freeport, Texas, as well as has a 32% interest in Contango Capital Partnership Management, LLC, which invests in the alternative energy venture capital market. In addition, the company holds 42.7% interest in Republic Exploration LLC, which holds a nonexclusive license to approximately 2,030 blocks of 3-D seismic data in the shallow waters of the Gulf of Mexico; 76.1% interest in Contango Offshore Exploration, LLC, which focuses on the acquisition and reprocessing 1,775 blocks of 3-D seismic data in the Gulf of Mexico; and 50% interest in Magnolia Offshore Exploration LLC, which owns license rights to 3-D seismic data covering 600 blocks of the Gulf of Mexico continental shelf. As of September 30, 2005, the company had total proved reserves of 1,229 million cubic feet of natural gas and 70 thousand barrels of oil. Contango Oil & Gas Company was founded in 1986 and is based in Houston, Texas.


DOMINION RESOURCES BLACK WARRIOR TRUST (DOM)

Dominion Resources Black Warrior Trust operates as the grantor trust in the United States. It acquires and holds certain overriding royalty interests burdening proved natural gas properties located in the Pottsville coal formation of the Black Warrior Basin, Tuscaloosa County, Alabama. These properties comprise 34,212 gross acres of land in an area of approximately 5 miles wide and 23 miles long located on the Tuscaloosa to Bankhead Lake portion of the Black Warrior Basin. The royalty interests entitle the trust to receive 65% of the gross proceeds. As a grantor trust, Dominion Resources Black Warrior Trust is not subject to federal income taxes. The trust was formed in 1994 and is based in Dallas, Texas.


TORCH ENERGY ROYALTY TRUST (TRU)

Torch Energy Royalty Trust, a grantor trust, holds the net profits interests, to receive payments from Torch Royalty Company and Velasco Gas Company, Ltd. It consists of net profits interests in proved developed oil and gas properties located in Texas, Alabama, and Louisiana. The Trust was formed in 1993 and is based in Wilmington, Delaware.


ATLAS PIPELINE PARTNERS L.P (APL)

Atlas Pipeline Partners, L.P., through its operating partnership, Atlas Pipeline Operating Partnership, L.P., engages in the ownership and operation of natural gas pipeline gathering systems. The partnership's gathering systems gather natural gas from wells in eastern Ohio, western New York, and western Pennsylvania; and transport the natural gas primarily to public utility pipelines. It also transports natural gas to end-users. As of May 4, 2005, Atlas Pipeline had approximately 3,640 miles of intrastate gathering systems and served approximately 5,100 wells. It also owns gas processing and treating facilities in Oklahoma. The partnership was formed in 1999 and is based in Moon Township, Pennsylvania. Atlas Pipeline Partners, L.P. acquired all of the outstanding equity interests in ETC Oklahoma Pipeline, Ltd. in April 2005.


DOUBLE EAGLE PETROLEUM COMPANY (DBLE)

Double Eagle Petroleum Co. engages in the exploration, development, production, and sale of crude oil and natural gas in the Rocky Mountain Basins of the western United States. It primarily explores and develops Green River Basin in southwestern Wyoming, the Powder River Basin in northeastern Wyoming, the Washakie Basin in south central Wyoming, the Wind River Basin in central Wyoming, and the Christmas Meadows area in northeastern Utah. As of December 31, 2004, the company owned interests in a total of 524 producing wells. Double Eagle Petroleum's total proved oil reserves were 278,055 Bbls and total proved gas reserves were 34,934,746 Mcf, as of the above date. The company was founded in 1972 and is headquartered in Casper, Wyoming.


GEORESOURCES INC (GEOI)

GeoResources, Inc. engages in the exploration, development, and production of oil and gas in North Dakota and Montana. The company, through its subsidiary, Western Star Drilling Company, provides rig, equipment, and personnel on a contract basis. It also operates leonardite mine (oxidized lignite coal) and a processing plant in Williston, which manufactures leonardite based products used primarily as drilling mud additives in oil and gas drilling companies, metal working foundries, and agricultural applications. As of December 31, 2004, the company had proved developed reserves of 1,652,000 barrels of oil and 391,000 mcf of gas. As of the above date, it developed oil and gas leases covering approximately 15,984 net acres in Montana and North Dakota; and owned 15 unpatented mining claims and 7 patented mining claims in Arizona. The company was incorporated in 1958 and is based in Williston, North Dakota.


SANTOS LTD (STOSY)

No description available.


ROYALE ENERGY INC (ROYL)

Royale Energy, Inc. operates as an independent oil and natural gas producer in the United States. It primarily engages in the production and sale of natural gas, acquisition of oil and gas lease interests and proved reserves, and drilling of both exploratory and development wells. The company owns wells and leases located principally in the Sacramento Basin and San Joaquin Basin in California, as well as in Utah, Texas and Louisiana. As of December 31, 2004, Royale Energy operated 68 wells in northern and central California; and owned working interests in 2 producing wells in offshore Louisiana and 12 producing wells in Texas, as well as held a minority interest in 1 producing gas well in Oklahoma. As of December 31, 2004, the company had proved developed reserves of approximately 8,135 million cubic feet of natural gas and 146 thousand barrels of oil reserves in northern and central California. Royale Energy was incorporated in 1986 and is based in San Diego, California.


CREDO PETROLEUM CORPORATION (CRED)

CREDO Petroleum Corporation engages in the acquisition, exploration, development, and production of oil and gas in the Mid-Continent and Rocky Mountain regions of the United States. It focuses on two core projects, natural gas drilling in the Northern Anadarko Basin of Oklahoma; and recovering standard gas from low-pressure reservoirs using its Calliope Gas Recovery System. The company's developed acreage was approximately 25,200 net and 142,800 gross acres, as of October 31, 2004. Its estimated proved oil and gas reverses were approximately 407,000 barrels of oil and approximately 15,273,000 mcf of gas, as of the above date. CREDO Petroleum Corporation owns working and royalty interests in approximately 128 wells, which are operated by outside parties. It owns working interests in approximately 69.53 net wells consisting of 16.23 net oil wells and 53.30 net gas wells. In addition, the company owns royalty and production payment interests in approximately 977 wells, primarily coal bed methane located in Wyoming. The company sells its oil production to crude oil purchasing companies. CREDO Petroleum Corporation was incorporated in 1978 and is headquartered in Denver, Colorado.


PRIMEENERGY CORPORATION (PNRG)

PrimeEnergy Corporation engages in the development, exploration, acquisition, and production of oil and natural gas properties. The company owns leasehold, mineral, and royalty interests in producing and nonproducing oil and gas properties throughout the United States, primarily in Colorado, Kansas, Louisiana, Mississippi, Montana, Nebraska, New Mexico, North Dakota, Oklahoma, Texas, Utah, West Virginia, and Wyoming, as well as in the Gulf of Mexico. In addition, it provides well-servicing support operations, site-preparation, and construction services for oil and gas drilling and reworking operations. As of December 31, 2004, PrimeEnergy operated 1,533 wells and owned nonoperating interests in approximately 770 wells. Its offshore properties had net proved reserves of 10.2 billion cubic feet equivalent of gas, as of the above date. The company was organized in 1973 and is based in Stamford, Connecticut.


BARNWELL INDUSTRIES INC (BRN)

Barnwell Industries, Inc. and its subsidiaries engage in the exploration, development, production, and sale of oil and natural gas primarily in Canada. The company also drills wells and maintains water systems, as well as invests in leasehold land in Hawaii. The company's principal oil and natural gas property includes Dunvegan Unit located in Alberta. As of September 30, 2005, this property had 188 natural gas wells. It owned and operated four rotary drill rigs, and pump installation and service equipment, as well as leased one rotary drill/workover rig to an oil company, as of the above date. The company had 1,102,000 barrels of proved oil and 21,842,000 thousand cubic feet of proved natural gas reserves, as of above date. Barnwell Industries, Inc. was incorporated in 1956 and is based in Honolulu, Hawaii.


ISRAMCO INC (ISRL)

Isramco, Inc. and its subsidiaries engage in the acquisition, exploration, operation, and development of oil and gas properties in the United States and Israel. It holds a participation interest in two long-term offshore leases and serves as an operator of one lease; and holds a participation interest in an offshore license and serves as the operator in Israel. The company, through its wholly-owned subsidiaries, engages in oil and gas exploration and production in the United States. It owns working interests in oil and gas wells in Louisiana, Texas, Oklahoma, and Wyoming. As of December 31, 2004, the company had approximately 140,000 net barrels of proved developed producing oil and 2,011 million cubic feet of proved developed producing natural gas. Isramco also holds interests in real estate properties in Israel. In addition, the company owns and leases a luxury cruise liner. Isramco was formed in 1982 and is based in Houston, Texas.