List of petroleum companies
Overview
 
This is a list of selected petroleum
Petroleum
Petroleum or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. Petroleum is recovered mostly through oil drilling...

 (crude oil) exploration and production companies
in alphabetical order. This list does not included companies involved in refining and marketing only.
Encyclopedia
This is a list of selected petroleum
Petroleum
Petroleum or crude oil is a naturally occurring, flammable liquid consisting of a complex mixture of hydrocarbons of various molecular weights and other liquid organic compounds, that are found in geologic formations beneath the Earth's surface. Petroleum is recovered mostly through oil drilling...

 (crude oil) exploration and production companies
in alphabetical order. This list does not included companies involved in refining and marketing only.

Africa

Sonatrach
Sonatrach
Sonatrach is an Algerian government-owned company formed to exploit the hydrocarbon resources of the country. Its diversified activities cover all aspects of production: exploration, extraction, transport, and refining...

 Sonangol Group
Sonangol Group
Group Sonangol is a parastatal that oversees petroleum and natural gas production in Angola. Sonangol actually had become a fundraising machine of government. The group consists of Sonangol EP and its many subsidiaries...

 National Petroleum Company of the Congo Vegas Oil and Gas
Vegas Oil and Gas
Vegas Oil and Gas S.A. is a company based in Egypt focusing on petroleum exploration. Headquartered in Athens, but mainly operating from the Cairo suburb of Maadi.Vegas is owned by the Vardinogiannis family....

 Arabian Gulf Oil Company
Arabian Gulf Oil Company
The Arabian Gulf Oil Company is an oil company based in Benghazi, Libya, engaged in crude oil and natural gas exploration, production and refining. It was a subsidiary of the state-owned National Oil Corporation . -Overview:...

 National Oil Corporation
National Oil Corporation
The National Oil Corporation is the national oil company of Libya. It dominates Libya's oil industry, along with a number of smaller subsidiaries, which combined account for around 70% the country's oil output...

 Nigerian National Petroleum Corporation
Nigerian National Petroleum Corporation
The Nigerian National Petroleum Corporation is the state oil corporation through which the federal government of Nigeria regulates and participates in the country's petroleum industry.-History:...

 Sasol
Sasol
Sasol Ltd. is a South African company involved in mining, energy, chemicals and synfuels. In particular, they produce petrol and diesel profitably from coal and natural gas using Fischer-Tropsch process...

 Sudapet
Sudapet
The Sudan National Petroleum Corporation, also known as Sudapet, is a state-owned oil company based in Sudan. It was founded in 1997 and is 100% owned by the Ministry for Energy and Mining....

 Entreprise Tunisienne d'Activites Petroliere
Entreprise Tunisienne d'Activites Petroliere
Entreprise Tunisienne d'Activités Pétrolières is a state-owned industrial and commercial company in Tunisia directly in charge of the petroleum sector as well as the state's partnerships with foreign exploration and production operators.-Overview:...

 Madagascar Oil
Madagascar Oil
Madagascar Oil SA is a Malagasy company, founded by Sam Malin with South African businessman Michael Smith and Australian businessmen Robert Nelson. Madagascar Oil focuses on the development, exploration and production of petroleum. It is the principal onshore oil company in Madagascar in terms of...


Americas

Bridas Corporation
Bridas Corporation
Bridas Corporation is an independent oil and gas holding company based in Argentina. Since March 2010 it is 50% owned by China National Offshore Oil Corporation.-Operations:...

 Enarsa
Enarsa
Enarsa , in full Energía Argentina Sociedad Anónima, is a company managed by the national state of Argentina for the integral exploitation of petroleum and natural gas, and the production, industrialization, transport and trade of these and of electricity.Enarsa was founded on December 29, 2004 by...

 YPF YPFB
YPFB
Yacimientos Petrolíferos Fiscales Bolivianos is the state-owned petrol company of Bolivia.-History:YPFB was created in 1936 as a state-owned and run petrol company. During the first presidency of Gonzalo Sánchez de Lozada, capitalized oil companies were formed from YPFB properties under the...

 Petrobras
Petrobras
Petróleo Brasileiro or Petrobras is a semi-public Brazilian multinational energy corporation headquartered in Rio de Janeiro, Brazil. It is the largest company in Latin America by market capitalization and revenue, and the largest company headquartered in the Southern Hemisphere by market...

 OGX Canadian Natural Resources Limited
Canadian Natural Resources Limited
Canadian Natural Resources Limited is an oil and natural gas exploration, development and production company centered in Calgary, Alberta. Operations are focused in western Canada, the North Sea and offshore West Africa. It ranks number 251 on the Forbes Global 2000 list for...

 Encana Husky Energy
Husky Energy
Husky Energy Inc. is a large integrated Canadian energy company based in Calgary, Alberta. Husky's foundation is in Western Canada, where it has extensive conventional oil and natural gas assets, significant heavy oil production and a range of midstream and downstream operations, including...

 Imperial Oil
Imperial Oil
Imperial Oil Limited is Canada's largest petroleum company. The company is engaged in the exploration, production and sale of crude oil and natural gas. It is controlled by US based ExxonMobil, which owns 69.6% of its stock...

 Laricina Energy
Laricina Energy
Laricina Energy Ltd. is a private Canadian oil producing company engaged in exploration in North-Eastern Alberta. The company targets oil sands opportunities outside of the Athabasca mining area and is focusing on in situ plays in the Grosmont and Grand Rapids formations. Its headquarters are...

 Nexen
Nexen
Nexen Inc. is an energy company based in Calgary, Alberta, Canada.-History:Nexen started in 1969 under the name "Canadian Occidental Petroleum Ltd.", aka CanOxy, and was 80% owned by Occidental Petroleum, a Los Angeles-based oil company...

 Pacific Rubiales Energy
Pacific Rubiales Energy
Pacific Rubiales Energy is a petroleum exploration and production company in the business of heavy crude oil and natural gas. Its focus is on Colombia and Peru where it holds numerous properties including 38 blocks in the Llanos, Lower Magdalena and Cesar Valley, Rancheria, Upper and Middle...

 PetroKazakhstan
PetroKazakhstan
PetroKazakhstan is a Canadian oil company, based in Calgary, that has all of its business focused on Kazakhstan where it had some of oil and of natural gas reserves in the Turgai basin region. These are the second largest Kazakhstani proven reserves after ChevronTexaco's TengizChevroil....

 Suncor Energy
Suncor Energy
Suncor Energy Inc. is a Canadian integrated energy company based in Calgary, Alberta. It specializes in production of synthetic crude from oil sands...

 Syncrude
Syncrude
Syncrude Canada Ltd. is the world's largest producer of synthetic crude oil from oil sands and the largest single source producer in Canada. It is located just outside Fort McMurray in the Athabasca Oil Sands, and has a nameplate capacity of of oil, equivalent to about 13% of Canada's consumption...

 Talisman Energy
Talisman Energy
Talisman Energy Inc. is one of Canada's largest petroleum SB companies. Based in Calgary, Alberta, Talisman Energy has operations around the globe including: Canada and the United States of America in North America; Colombia and Peru in South America; Algeria in North Africa; United Kingdom,...

 Empresa Nacional del Petróleo
Empresa Nacional del Petróleo
Empresa Nacional del Petróleo, or ENAP is a state owned company in Chile, based in Las Condes. The company is engaged in the exploration, production, refining, and marketing of hydrocarbons and their derivatives. ENAP was created by Law No. 9618, June 19, 1950...

 Ecopetrol
Ecopetrol
Ecopetrol , formerly known as Empresa Colombiana de Petróleos S.A. is the largest and primary petroleum company in Colombia. Because of its size, Ecopetrol is a Fortune Global 500 company ranked 445, it belongs to the group of the 25 largest petroleum companies in the world, and it is one of the...

 Cupet
Cupet
Cupet is Cuba's state oil company. The company is involved in the extraction of petroleum deposits, refining, and distributing petroleum products. In conjunction with the conglomerate Cimex, it operates a chain of filling stations selling gasoline in convertible pesos.The extraction is based in...

 Petroecuador
Petroecuador
Petroecuador [Petroleums of Ecuador State Enterprise] is the national oil company of Ecuador. It is a state-owned enterprise, founded on September 26, 1989...

 Petróleos Mexicanos
Pemex
Petróleos Mexicanos or Pemex is a Mexican state-owned petroleum company. As of 2010, with a total asset worth of $415.75 billion, it is the second non-publicly listed largest company in the world by total market value, and Latin America's second largest enterprise by annual revenue as of 2009...

 Petroperú
Petroperu
Petróleos del Perú S.A. is a Peruvian state-owned petroleum company. Its activities include transport, refinery and commercialization of fuel and other oil derivatives...

 Petrotrin
Petrotrin
Petrotrin, the Petroleum Company of Trinidad and Tobago is the major State-owned oil company in Trinidad and Tobago. The company was established in 1993 by the merger of Trintopec and Trintoc, two state-owned oil companies. A third company, Trinmar was later merged into the company...

 Anadarko Petroleum Corporation
Anadarko Petroleum Corporation
Anadarko Petroleum Corporation is one of the world’s largest independent oil and gas exploration and production companies, with approximately 2.3 billion barrels of oil equivalent of proved reserves and production of 206 million BOE as of December 31, 2008. Anadarko employs a worldwide...

 Apache Corporation
Apache Corporation
Apache Corporation is an American independent oil and gas corporation. It is headquartered in 1 Post Oak Central in the Uptown district of Houston, Texas....

 Chevron Corporation
Chevron Corporation
Chevron Corporation is an American multinational energy corporation headquartered in San Ramon, California, United States and active in more than 180 countries. It is engaged in every aspect of the oil, gas, and geothermal energy industries, including exploration and production; refining,...

 ConocoPhillips
ConocoPhillips
ConocoPhillips Company is an American multinational energy corporation with its headquarters located in the Energy Corridor district of Houston, Texas in the United States...

 Devon Energy
Devon Energy
Devon Energy Corporation , is among the largest U.S.-based independent natural gas and oil producers. Based in Oklahoma City, Oklahoma, the company's operations are focused on North American onshore exploration and production...

 Ensco International
ENSCO International
Ensco plc is a multinational oil and gas services company headquartered in London, United Kingdom. It is the world's second-largest offshore oil and gas well drilling company, and has 49 offshore jack-ups, seven drillships and 20 semi-submersible drilling rigs servicing domestic US, international,...

 ExxonMobil
ExxonMobil
Exxon Mobil Corporation or ExxonMobil, is an American multinational oil and gas corporation. It is a direct descendant of John D. Rockefeller's Standard Oil company, and was formed on November 30, 1999, by the merger of Exxon and Mobil. Its headquarters are in Irving, Texas...

 Greka Energy
Greka Energy
Greka Energy, currently also known as HVI Cat Canyon Inc. is a private United States oil and gas company operating principally in southern and central California, centered on Santa Barbara County...

 Hess Corporation
Hess Corporation
The Hess Corporation is an integrated oil company based in New York City. The company explores, produces, transports, and refines crude oil and natural gas. Vertically completing the logistical chain, about 1,360 Hess branded filling stations market gasoline to consumers in 16 states along the...

 HKN, Inc. Koch Industries
Koch Industries
Koch Industries, Inc. , is an American private energy conglomerate based in Wichita, Kansas, with subsidiaries involved in manufacturing, trading and investments. Koch also owns Invista, Georgia-Pacific, Flint Hills Resources, Koch Pipeline, Koch Fertilizer, Koch Minerals and Matador Cattle Company...

 Marathon Oil
Marathon Oil
Marathon Oil Corporation is a United States-based oil and natural gas exploration and production company. Principal exploration activities are in the United States, Norway, Equatorial Guinea, Angola and Canada. Principal development activities are in the United States, the United Kingdom, Norway,...

 Murphy Oil
Murphy Oil
Murphy Oil Corporation is an international oil and gas company, founded in 1944 as C.H. Murphy & Co by Charle H Murphy Sr., that conducts business through various operating subsidiaries. Murphy produces oil and/or natural gas in the United States, Canada, Malaysia, the United Kingdom and Republic...

 Occidental Petroleum
Occidental Petroleum
Occidental Petroleum Corporation is a California-based oil and gas exploration and production company with operations in the United States, the Middle East, North Africa, and South America...

 Plains Exploration & Production
Plains Exploration & Production
Plains Exploration & Production, commonly known by its New York Stock Exchange ticker symbol , is a U.S. petroleum company based in Houston, Texas. A spin-off from Plains Resources, Inc., the company was founded in 2002. Its operations, as of 2009, were all in North America, including California,...

 Sovereign Group
Sovereign Group
The first Sovereign Group office opened in Gibraltar in 1987. Sovereign's core business is setting up and managing tax-efficient structures to assist wealth management, foreign property ownership and cross-border business...

 Vaalco Energy XTO Energy
XTO Energy
XTO Energy is an American Fortune 500 energy producing company. Its primary products are oil and natural gas. It is based in Downtown Fort Worth, Texas. Its current CEO is Keith Hutton.-History:The company was founded in 1985 as Cross Timbers Oil Company...

 ANCAP
ANCAP (Uruguay)
ANCAP is a state-owned company in Uruguay. It is involved in the production of petroleum products, Portland cement and alcoholic beverages. It operates the Uruguay's single oil refinery at La Teja with capacity of per day...

 Petróleos de Venezuela

Asia

Azerbaijan International Operating Company
Azerbaijan International Operating Company
Azerbaijan International Operating Company is a consortium of currently 10 petroleum companies that have signed extraction contracts with Azerbaijan...

 State Oil Company of Azerbaijan Republic Bahrain Petroleum Company Myanma Oil and Gas Enterprise
Myanma Oil and Gas Enterprise
Myanma Oil and Gas Enterprise is a national oil and gas company of Burma. The company is a sole operator of oil and gas exploration and production, as well as domestic gas transmission through a onshore pipeline grid....

 CNOOC
China National Offshore Oil Corporation
China National Offshore Oil Corporation is one of the three major national oil companies of China....

 PetroChina
PetroChina
PetroChina Company Limited is a Chinese oil company and is the listed arm of state-owned China National Petroleum Corporation , headquartered in Dongcheng District, Beijing. It is China's biggest oil producer, and was the world's most valuable company by market value as of September 28th 2010...

 Sinopec
Sinopec
China Petroleum & Chemical Corporation Limited , or Sinopec Limited , is a majority owned subsidiary of state owned company Sinopec Group. Sinopec Limited is listed in Hong Kong and also trades in Shanghai and New York ....

 Gujarat State Petroleum Corporation
Gujarat State Petroleum Corporation
Gujarat State Petroleum Corporation Ltd is an oil and gas exploration company in Gujarat, India. It is India's only State Government-owned oil and gas company with the Government of Gujarat holding approximately 95% equity stake. GSPC was incorporated in 1979 as a petrochemical company...

 Essar Oil
Essar Oil
Essar Oil is an Indian integrated oil and gas company that is part of the Essar group based in Mumbai. It operates a major refinery in Gujarat, India, which made it the second largest non-state refiner in India in 2009....

 Hindustan Petroleum Corporation Bharat Petroleum Corporation Indian Oil Corporation
Indian Oil Corporation
Indian Oil Corporation Limited, or IndianOil, is an Indian state-owned oil and gas corporation with its headquarters are in Mumbai, India. It is India’s largest commercial enterprise, ranked 98th on the Fortune Global 500 list for 2011...

 Mangalore Refinery and Petrochemicals Limited Chennai Petroleum Corporation Oil and Natural Gas Corporation
Oil and Natural Gas Corporation
The Oil and Natural Gas Corporation Limited is an Indian state-owned oil and gas company headquartered in New Delhi, India. It is one of the largest Asia-based oil and gas exploration and production companies, and produces around 77% of India's total crude oil production and around 81% of...

 Oil India
Oil India
Oil India is a public sector oil and gas company in India under the administrative control of the Ministry of Petroleum and Natural Gas of the Government of India. OIL is engaged in the business of exploration, development and production of crude oil and natural gas, transportation of crude oil...

 Reliance Industries
Reliance Industries
Reliance Industries Limited is an Indian conglomerate company headquartered at Mumbai, India. The company operates through three business segments: petrochemicals, refining, and oil and gas, other segment of the company includes textile, retail business, special economic zone development and...

 MedcoEnergi
MedcoEnergi
MedcoEnergi, short for PT Medco Energi Internasional Tbk, is an Indonesian energy company that was founded on June 9, 1980. Started as drilling contractors, MedcoEnergi has transformed into an integrated energy company with business involvement in oil and gas exploration and production, downstream...

 Pertamina
Pertamina
Pertamina is an Indonesian government-owned corporation which extracts and refines the country's oil and gas reserves. It was created in August 1968 by the merger of Pertamin and Permina...

 National Iranian Oil Company
National Iranian Oil Company
The National Iranian Oil Company , a government-owned corporation under the direction of the Ministry of Petroleum of Iran, is an oil and natural gas producer and distributor headquartered in Tehran. It was established in 1948...

 North Oil Company
North Oil Company
North Oil Company is situated in Kirkuk, Iraq.The North Oil Company is one of the 16 companies comprising the Iraqi Ministry of Oil. Headquartered in Kirkuk, its boundaries extend from the northern borders to the 32.5 degree parallel, just south of Baghdad....

 South Oil Company
South Oil Company
South Oil Company is a national Iraqi company responsible for the oil in the south of Iraq. It is situated in Basrah, Iraq. South oil company is one of the major fundamental formations of the Iraq National Oil Company...

 Missan Oil Company
Missan Oil Company
Missan Oil Company is a state-owned oil and gas company located in the Maysan Governorate, Iraq.It was spun off from South Oil Company in 2008 to expand oil activities in Maysan and to set up joint ventures with international companies to develop the province's oil fields....

 Midland Oil Company
Midland Oil Company
Midland Oil Company is a state-owned oil company and is Iraq's fourth oil company responsible for overseeing development in recently auctioned fields in the centre of the country. It has been announced to be launched by the Iraqi Ministry of Oil....

 Inpex
Inpex
is a Japanese oil company established in 1966 as North Sumatra Offshore Petroleum Exploration Co., Ltd.In 2006, INPEX acquired Japanese oil company Teikoku Oil.- Projects :...

 JAPEX
JAPEX
is a hydrocarbon exploration, production and transportation company. JAPEX explores and produces crude oil, natural gas and liquefied natural gas reserves worldwide. JAPEX has proven reserves of 272 million barrels in Japan and the rest of the world. Aside from operations in Hokkaido, Akita,...

 Nippon Oil
Nippon Oil
The , or NOC or Shin-Nisseki is a Japanese petroleum company. Its businesses include the exploration, importation, and refining of crude oil; the manufacture and sale of petroleum products, including fuels and lubricants; and other energy-related activities.Its products are sold under the brand...

 KazMunayGas
KazMunayGas
KazMunayGas is the state-owned oil and gas company of Kazakhstan. It was founded in 2002 by merging Kazakhoil and Oil and Gas Transportation.-Subsidiaries:Main subsidiaries of KazMunayGas are:...

 Kuwait Oil Company Petronas
Petronas
PETRONAS, short for Petroliam Nasional Berhad, is a Malaysian oil and gas company that was founded on August 17, 1974. Wholly owned by the Government of Malaysia, the corporation is vested with the entire oil and gas resources in Malaysia and is entrusted with the responsibility of developing and...

 Petroleum Development Oman
Petroleum Development Oman
Petroleum Development of Oman is the foremost exploration and production company in the Sultanate. It accounts for more than 90% of the country's crude-oil production and nearly all of its natural-gas supply...

 Oil and Gas Development Company Pakistan Petroleum Pakistan State Oil
Pakistan State Oil
Pakistan State Oil is the oil market leader in Pakistan. Its well established infrastructure, built at par with international standards, represents 82% of country’s storage...

 Mari Gas Company
Mari Gas Company
Mari Gas Company Limited is a Pakistan-based company engaged in the exploration and production of gas. After acquiring development and production lease , the company has 100% operational control of the Mari gas field area , located at Daharki, District Ghotki, Sindh...

 Qatar Petroleum
Qatar Petroleum
Qatar Petroleum is a state owned petroleum company in Qatar. The company operates all oil and gas activities in Qatar, including exploration, production, refining, transport, and storage. QP's Chairman Abdullah Bin Hamad Al-Attiyah, is also the head of the Ministry of Energy and Industry and, as...

 Saudi Aramco
Saudi Aramco
Saudi Aramco , officially the Saudi Arabian Oil Company, is the national oil company of Saudi Arabia.Saudi Aramco is the world's largest and most valuable privately-held company, with estimates of its value in 2011 to be $7 trillion USD.Saudi Aramco has both the largest proven crude oil reserves,...

 AOCE Singapore Petroleum Company
Singapore Petroleum Company
Singapore Petroleum Company Limited is a Singaporean oil company. SPC is involved in the exploration and production of petroleum, refining, trading and petroleum product distribution.- History :...

 Ceylon Petroleum Corporation
Ceylon Petroleum Corporation
Ceylon Petroleum Corporation is the national oil and gas company of Sri Lanka. It was set up as a state enterpise by Act. No. 28 of 1961 in parliament and further amendments carried out subsequently....

 Korea National Oil Corporation
Korea National Oil Corporation
Korea National Oil Corporation is the national oil and gas company of South Korea and one of the most important industrial companies in the country...

 PTT Public Company Limited
PTT Public Company Limited
PTT Public Company Limited, PTT PCL, or simply PTT is a Thai state-owned SET-listed oil and gas company. Formerly known as the Petroleum Authority of Thailand, it owns extensive submarine gas pipelines in the Gulf of Thailand, a network of LPG terminals throughout the Kingdom, and is involved in...

 ADNOC
ADNOC
The Abu Dhabi National Oil Company or ADNOC is the state-owned oil company of the United Arab Emirates . It is considered to be the world's fourth largest oil company with access to country's oil and gas reserves, .-Operations:...

 ENOC
ENOC
ENOC is the Dubai Government owned diversified energy group. One of its subsidiaries, ENOC Processing Company LCC runs the Jebel Ali refinery in Dubai. ENOC is a multi-interest oil and gas group and has operations in Dubai and Northern Emirates in UAE, although it does not have operations in Abu...

 Petrovietnam
Petrovietnam
PetroVietnam is the trading name of Vietnam Oil and Gas Group . PetroVietnam has developed rapidly since it was established in 1977, and its activities, through its various companies and wholly owned subsidiaries, now cover all the operations from oil and gas exploration and production to...


Australia and Oceania

BHP Billiton
BHP Billiton
BHP Billiton is a global mining, oil and gas company headquartered in Melbourne, Australia and with a major management office in London, United Kingdom...

 Santos Woodside Petroleum
Woodside Petroleum
Woodside Petroleum Limited is an Australian petroleum exploration and production company. It is a public company listed on the Australian Securities Exchange and has its headquarters in Perth, Western Australia.-History:...

 Todd Energy

Europe

OMV
OMV
OMV is Austria's largest oil-producing, refining and gas station operating company with important activities in other Central European countries...

 Petrol AD
Petrol AD
Petrol AD is a Bulgarian oil distributing company which has 470 petrol stations, 80 petrol depots and 3 petrol port terminals throughout the country. The company was privatised in 1999....

 INA – Industrija Nafte Moravské naftové doly
Moravské naftové doly
MND is the largest oil and gas producing company in the Czech Republic producing of oil per day and 250,000 m3 of gas per day. It also has storage facilities of 180 million m3....

 DONG Energy
DONG Energy
-History:The Danish state company Dansk Naturgas A/S was founded in 1972 to manage resources in the Danish sector of the North Sea. After some years, the company was renamed to Dansk Olie og Naturgas A/S . At the beginning of 2000s, DONG started to extend itself into the electricity market by...

 Maersk Oil
Maersk Oil
Maersk Oil is a Danish oil and gas company owned by the A. P. Moller-Maersk Group. The company was established in 1962 when Maersk Group was awarded a concession for oil and gas exploration and production in the Danish sector of the North Sea...

 Atlantic Petroleum
Atlantic Petroleum (Faroe Islands)
Atlantic Petroleum P/F is an oil and gas company situated in Faroe Islands. It participates in exploration on the Faroese Continental Shelf and offshore Ireland, and in exploration, appraisal and development in the United Kingdom's sector of the North Sea....

 Total S.A.
Total S.A.
Total S.A. is a French multinational oil company and one of the six "Supermajor" oil companies in the world.Its businesses cover the entire oil and gas chain, from crude oil and natural gas exploration and production to power generation, transportation, refining, petroleum product marketing, and...

 RWE Dea Wintershall
Wintershall
Wintershall AG is the largest crude oil and natural gas producer in Germany. The company is based in Kassel, Germany. Wintershall is a wholly owned subsidiary of BASF, based in Ludwigshafen. The name Wintershall is derived from the surname of the enterprise co-founder Carl Julius Winter and the...

 Hellenic Petroleum
Hellenic Petroleum
Hellenic Petroleum S.A. is the largest oil refining company in Greece and with its roots dating to 1958 with the establishment of the first oil refinery in Greece ....

 MOL Group Eni
Eni
Eni S.p.A. is an Italian multinational oil and gas company, present in 70 countries, and currently Italy's largest industrial company with a market capitalization of 87.7 billion euros , as of July 24, 2008...

 Ascom Group
Ascom Group
Ascom Group is the largest oil and gas company in Moldova. The company has commercial operations in Kazakhstan, Turkmenistan and Sudan and produces around 500,000 tonnes of oil/year and around 1.3 billion m3 of natural gas/year....

 Royal Dutch Shell
Royal Dutch Shell
Royal Dutch Shell plc , commonly known as Shell, is a global oil and gas company headquartered in The Hague, Netherlands and with its registered office in London, United Kingdom. It is the fifth-largest company in the world according to a composite measure by Forbes magazine and one of the six...

 DNO International Statoil
Statoil
Statoil ASA is a Norwegian petroleum company established in 1972. It merged with Norsk Hydro in 2007 and was known as StatoilHydro until 2009, when the name was changed back to Statoil ASA. The brand Statoil was retained as a chain of fuel stations owned by StatoilHydro...

 Grupa Lotos
Grupa LOTOS
Grupa LOTOS S.A. is a vertically integrated oil concern from Poland based in Gdańsk. The company is listed in the Polish index WIG 20. Its main activity branches are: crude oil production, refining and marketing of oil products....

 PGNiG
PGNiG
Polskie Górnictwo Naftowe i Gazownictwo is a Polish state-controlled oil and natural gas company, which deals with the exploration and production of natural gas and crude oil, natural gas import, storage and distribution and sales of natural gas and crude oil...

 PKN Orlen
PKN Orlen
PKN Orlen is a major European oil refiner, and petrol retailer. The company is Poland's and Central Europe's largest publicly traded firm with major operations in Poland, Czech Republic, Germany, and the Baltic States...

 Galp Energia
Galp Energia
The Galp Energia Group is a Portuguese corporation which consists of more than 100 companies engaged in activities such as natural gas supply, regasification, transport, storage, and distribution; petroleum products exploration, production, refining, trading, logistics and retailing; co-generation...

 Petrom
Petrom
Petrom is a Romanian oil company, the largest corporation in Romania and the largest gas and oil producer in Eastern Europe operating in several countries:*Romania - largest company;*Moldova - 2nd largest company, 31% market share;...

 Rompetrol
Rompetrol
The Rompetrol Group N.V. , is a Romanian oil company, that operates in many countries throughout Europe:unclear what "market share": refining? downstream? extraction? well services?*Romania - 2nd largest oil company, 40% market share...

 Bashneft
Bashneft
Bashneft is a Russian oil company. It is one of the largest producer of oil products in the country. The company operates 140 oil and natural gas fields in Russia and has an annual oil production of 16 million tonnes. Bashneft owns three oil refineries located in Ufa with a combined capacity of ...

 Gazprom Neft
Gazprom Neft
Gazprom Neft is the fifth largest oil producing and refining company in Russia. It's the oil arm of Gazprom, which owns 80% of Gazprom Neft's shares....

 Lukoil
LUKoil
Lukoil/LUKoil ; ) is Russia's second largest oil company and its second largest producer of oil. In 2009, the company produced 97.615 million tons of oil; ....

 Rosneft
Rosneft
Rosneft is an integrated oil company majority owned by the Government of Russia. Rosneft is headquartered in Moscow’s Balchug district near the Kremlin, across the Moskva river...

 Russneft
Russneft
Russneft is a Russian oil refining company and one of the largest producers of oil products in the country.The company operates two refineries in Orsk and Krasnodar, which have a combined capacity of , as well as 100 petrol stations...

 Sibir Energy
Sibir Energy
Sibir Energy is a London-based Russian public limited company, whose primary line of business is petroleum and natural gas exploration in Siberia. Its shares were traded on the Alternative Investment Market, part of the London Stock Exchange...

 Surgutneftegas
Surgutneftegas
Surgutneftegas is a Russian major oil and gas company. It was created in 1993 by merging several previously state-owned companies with large oil and gas reserves in Western Siberia. The company's headquarters are located in Surgut, Tyumen Oblast....

 Tatneft
Tatneft
Tatneft is a Russian vertically-integrated oil and gas company with headquarters in the city of Almetyevsk, in the Republic of Tatarstan. It is the sixth largest oil company in Russia.The company general director is Rinat Galeyev...

 TNK-BP
TNK-BP
TNK-BP is a major vertically integrated Russian oil company. It is Russia's third largest oil producer and among the ten largest private oil companies in the world. TNK-BP is Russia's third largest oil company in terms of reserves and crude oil production...

 Naftna Industrija Srbije
Naftna Industrija Srbije
Naftna Industrija Srbije is an oil company in Serbia. The company's main business is the oil and gas exploration, production, importing, processing, transportation, and marketing of oil and oil products in Serbia. It holds monopoly on all oil imports until 2011 except the high quality diesel fuel...

 Compañía Española de Petróleos
Compañía Española de Petróleos
Compañía Española de Petróleos, S.A. is one of the largest energy companies in Spain, founded in 1929, which operates in several European countries as well as in Algeria, Canada, Morocco, Brazil, and Panama. The company currently produces around and has a refining capacity in three refineries...

 Repsol YPF
Repsol YPF
Repsol YPF, S.A. is an integrated Spanish oil and gas company with operations in 29 countries...

 Türkiye Petrolleri Anonim Ortaklığı
Türkiye Petrolleri Anonim Ortakligi
Türkiye Petrolleri Anonim Ortaklığı is the national oil and gas company of Turkey and one of the most important industrial companies in the country. The company had reserves of of oil equivalent in 2005, and the reserves are projected to increase to of oil equivalent in 2010...

 Çalık Enerji
Çalik Enerji
Çalik Enerji is a Turkish energy company of the Çalık Holding, which was established in 1998. The main areas of operations include:* oil and gas exploration, production, transportation, and distribution;...

 Ukrnafta
Ukrnafta
Ukrnafta is a Ukrainian oil and natural gas extracting company, the largest producer of oil and gas in the country.The company produces around 3 million tonnes of oil and 4 billion m3 of natural gas per year, having oil proven reserves of nearly 180 million tonnes. Ukrnafta also ownes three natural...

 BG Group
BG Group
BG Group plc is a global oil and gas company headquartered in Reading, United Kingdom. It has operations in 25 countries across Africa, Asia, Australasia, Europe, North America and South America and produces around 680,000 barrels of oil equivalent per day. It has a major Liquefied Natural Gas ...

 BP
BP
BP p.l.c. is a global oil and gas company headquartered in London, United Kingdom. It is the third-largest energy company and fourth-largest company in the world measured by revenues and one of the six oil and gas "supermajors"...

 Cairn Energy
Cairn Energy
Cairn Energy plc is a global oil and gas exploration company headquartered in Edinburgh, United Kingdom. It has operational interests in Albania, Bangladesh, Greenland, India, Nepal and Tunisia and produces around 33,000 barrels of oil equivalent per day...

 Perenco
Perenco
Perenco is an independent Anglo-French oil and gas company with a headquarters in London. It has exploration and production activities in 16 countries across the globe .Perenco is involved in operations both...

 Premier Oil
Premier Oil
Premier Oil plc is an independent British UK oil company with gas and oil interests in the UK, Asia and Africa. It is devoted entirely to the 'upstream' sector of the industry - the exploitation of oil and gas - as opposed to the 'downstream' refining and retail sector...

 Salamander Energy
Salamander Energy
Salamander Energy is a leading British-based oil and gas exploration and production business. Its activities are focused on South East Asia. It is headquartered in London and is a constituent of the FTSE 250 Index.-History:...

 Tullow Oil
Tullow Oil
Tullow Oil plc is a global oil and gas exploration company headquartered in London, United Kingdom. It has interests in over 85 licences across 23 countries and in 2010 produced 58,100 barrels of oil equivalent per day...

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