BP p.l.c. engages in the energy business worldwide.
Tullow Oil plc engages in the oil and gas exploration, development, and production activities primarily in Africa and South America.
John Wood Group PLC, together with its subsidiaries, provides project, engineering, and technical services in energy, industry, and built environment worldwide.
Energean Oil & Gas plc operates as an independent oil and gas exploration and production company.
Petrofac Limited, an oilfield service company, provides facilities solutions to the oil and gas production and processing industry worldwide.
Cairn Energy PLC operates as an oil and gas exploration, development, and production company.
Hurricane Energy plc, together with its subsidiaries, discovers, appraises, and develops oil from fractured basement reservoirs.
Diversified Gas & Oil PLC operates as an independent owner and operator of producing natural gas and oil wells primarily in the Appalachian Basin of the United States.
Hunting PLC, together with its subsidiaries, manufactures and distributes tools and equipment for the upstream energy industry worldwide.
Premier Oil plc, an oil and gas company, engages in the exploration, production, and development of oil and gas properties primarily in the Falkland Islands, Indonesia, Pakistan, the United Kingdom, Vietnam, and internationally.
Seplat Petroleum Development Company Plc, an oil and gas company, explores for, develops, and produces oil and gas in Nigeria.
Faroe Petroleum plc, an independent oil and gas company, engages in the exploration, appraisal, and development of oil and gas fields in Northwest Europe.
Indus Gas Limited, together with its subsidiaries, operates as an oil and gas exploration and development company in India.
Genel Energy plc, through its subsidiaries, engages in the oil and gas exploration and production activities.
Gulf Keystone Petroleum Limited engages in the exploration, evaluation, and production of oil and gas properties in the Kurdistan Region of Iraq and the United Kingdom.
Phoenix Global Resources plc operates as an independent oil and gas exploration and production company in Argentina.
