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

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

Sempra Generation (formerly Sempra Energy Resources) pools its parent's resources into generating electricity for the competitive market. The unit, which is part of Sempra Energy 's Sempra Global division, has more than 2,600 MW of generating capacity from interests in fossil-fueled power plants. Sempra Generation operates gas-fired power plants in Arizona, California and Nevada, and in Mexicali, Mexico. In order to reduce carbon emission output to meet state and federal regulations the company is developing its first wind power and solar energy projects.

Tidelands Oil & Gas' hopes that the rising tide of oil prices will lift its revenues. Through its subsidiaries, the company operates a number of natural gas and natural gas liquids (NGLs) transportation, processing, distribution, and storage projects in the northeastern states of Mexico (Chihuahua, Coahuila, Nuevo Le�n, and Tamaulipas) and in Texas. Sonora Pipeline operates an 80-mile natural gas pipeline and a gas processing plant in Texas Sonora Pipeline is owned by Frontera Pipeline, in which Tidelands has a 20% stake. Tidelands is also looking into developing a liquefied natural gas (LNG) terminal near Long Beach.

Hilcorp Energy, an oil and natural gas producer founded in 1989 by Jeffrey Hildebrand, is one of the nation's largest privately held energy companies. Hilcorp Energy Company employs the latest technology to extract oil and gas from mature fields that have been abandoned by other operators. Hilcorp Energy Company pumps about 25 million barrels of oil and natural gas equivalent annually and has proved reserves of 120 million barrels. A former Exxon Mobil geologist, Hildebrand started the company with former partner Thomas Hook.

Insignia Energy Ltd.is oil and gas exploration and development company. Insignia Energy Ltd. focuses on finding and exploiting high quality, long-lived reserves in properties in northern, eastern, and central Alberta. Insignia Energy produces about 3,300 barrels of oil equivalent per day of natural gas. Insignia Energy Ltd. has proved reserves in 7.9 million barrels of oil equivalent and an undeveloped land base of 235,000 net acres. In 2008 Insignia Energy completed a reverse takeover of Flagship Energy. In 2009 it expanded further, acquiring fellow explorer Grey Wolf Exploration.

Savanna Energy Services provides field services to oil and gas customers in Canada. Savanna Energy Services Corp. provides well servicing through subsidiaries Great Plains Well Servicing, Accell Well Services, and Command Coil, and drilling services through Trailblazer Drilling Corp., Lakota Drilling, and Akuna Drilling. Savanna Energy maintains a fleet of 99 drilling rigs, 56 well servicing rigs, and eight coiled tubing units. Savanna Energy Services Corp. operates primarily in the Western Canadian Sedimentary Basin. Savanna Energy was formed in 2001 and completed a public offering in 2004. In 2007 Savanna Energy Services Corp. sold its Ultraline Services subsidiary, which provides cased hole wireline services, to Halliburton.

NuStar GP Holdings, LLC (NYSE: NSH) owns general partner and limited partner interests in NuStar Energy L.P. (NYSE: NS), one of the nation's largest asphalt refiners and marketers and operators of petroleum product terminals and petroleum liquids pipelines. The general partner manages the business affairs of NuStar Energy L.P., which is a master limited partnership based in San Antonio, with 8,417 miles of pipeline, 82 terminal facilities and four crude oil storage facilities. It has assets strategically located in major U.S. markets and in the Netherlands Antilles, Canada, Mexico, the Netherlands and the United Kingdom. NuStar Energy L.P.'s asphalt refineries, refined product terminals, petroleum and specialty liquids storage and terminaling operations, and crude oil storage tank facilities are predominantly located on waterways that are easily accessible by barge or vessel. Altogether, these facilities have over 91 million barrels of storage capacity. NuStar Energy L.P.'s crude oil and refined products pipeline systems largely serve growing markets in the Mid-Continent, Southwest and Texas-Mexico border region of the United States.

Motor Oil Hellas (MOH) is committed to being a leader in the petroleum refining business thus providing the region that it serves with a reliable and affordable supply of energy. Through its evolution MOH is now considered as one of the major contributors to the domestic economy and a key market player in the region. MOH is listed in the Athens Exchange and is a constituent of the indices : ATHEX COMPOSITE, FTSE/ATHEX 20, FTSE/ATHEX INTERNATIONAL. Furthermore, the Company is a constituent of the MSCI SMALL CAP INDEX. The Refinery with its ancillary plants and offsite facilities forms the largest privately held industrial complex in Greece and is considered as one of the most modern refineries in Europe. Due to its flexibility it can process crude oils of various characteristics and produce a full range of petroleum products, complying with the most stringent International Specifications, serving major petroleum marketing companies in Greece and abroad. Apart from fuels, MOH is the only Lubricants producer and packager in Greece. Base oils and finished lubricants produced, are approved by International Organizations, ACEA, API, the US NAVY & ARMY. The Refinery production operations are located in Agii Theodori, in the province of Corinth, about 70 km outside Athens. The Administration and the General Divisions of Marketing, Finance and Corporate Planning are housed at the company Headquarters in a modern building in Maroussi, a suburb of Athens.

Rubis has grown to be one of the largest bulk liquid storage operators in France. Through its Rubis Terminal unit, the company stores chemicals, fertilizers, agriculture products, oil and gas, and waste materials. Through Rubis Energie (formerly Rubis Gaz), Rubis distributes liquefied petroleum gas (LPG) to retailers, as well as propane and butane to residential and commercial customers. Outside France, Rubis has expanded LPG distribution operations to Bermuda, Comoros, the French Antilles, Madagascar, Morocco, and Senegal. Rubis sells LPG under the Vitogaz brand.

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