Baron Oil is an independent oil and natural gas exploration company. Co. owns exploration acreage in the U.K. and Peru. The principal activity of Co. is that of oil and gas exploration and production.

Antares Energy is an exploration and production company pursuing oil and gas opportunities located onshore Texas in the U.S. Co.'s principal activity includes hydrocarbon production and exploration. Co. has exploration leases for the following projects located in in Texas: Oyster Creek, Southern Star, Big Star, Northern Star, and Hawkville. As of Dec 31 2012, Co.'s estimated total proved reserves were approximately 15.2 million barrels of oil equivalent (MMboe), proved and probable were approximately 53.2 MMboe and proved, probable and possible were approximately 66.8 MMboe.

Caspian Sunrise is engaged in exploration and production of crude oil. Co. builds a portfolio of oil and gas exploration and production assets in Central Asia and in particular Kazakhstan.

Eni is engaged in the oil and gas exploration and production, gas marketing operations, management of gas infrastructures, power generation, petrochemicals, oil field services and engineering industries. Co.'s operations are divided into three segments; Exploration and Production (oil and natural gas exploration and field development and production, as well as LNG operations), Gas and Power (supply, trading and marketing of gas and electricity, managing gas infrastructures for transport, distribution, storage, re-gasification, and LNG supply and marketing), and Refining and Marketing (supply of crude oil, refining and marketing of refined products). Co. maintains operations in 73 countries.

Enquest is an oil and gas production and development company. As of Dec 31 2016, Co.'s principal U.K. assets were its interests in the producing operated oil fields Heather/Broom, Thistle/Deveron, the Dons area, the Greater Kittiwake Area, Alma/Galia and Scolty/Crathes. In addition, Co. had interests in the Kraken development and also a non-operated interest in the producing Alba oil field. In Malaysia, Co.'s operated assets comprise the PM8/Seligi Production Sharing Contract and the Tanjong Baram Risk Services Contract. At Dec 31 2016, Co. had proven and probable reserves of 215.0 million barrels of oil equivalent.

Frontera Energy is a publicly traded oil and gas company engaged in the exploration, development and production of heavy crude oil and natural gas in Colombia, Peru, Brazil, and Guatemala.

Galp Energia is a holding company. Through its subsidiaries, Co. operates in the following segments: exploration and production, with activities relating to exploration, development and production of hydrocarbons, particularly in Angola, Brazil and Mozambique; refining and marketing, which owns refineries in Portugal and also includes activities relating to the retail and wholesale commercialization of oil products; and gas and power, which covers the purchasing, commercialization, distribution and storage of natural gas and electric and thermal power production. As of Dec 31 2014, Co. had proved and probable reserves of 638.0 million barrels of oil equivalent.

Jadestone Energy is engaged in the evaluation, acquisition, exploration and development of oil and gas properties.

Maha Energy AB is a Sweden-based independent, international upstream oil and gas company whose business activities include exploration, development and production of crude oil. It directly operates through Maha Energy Inc in Canada, as well as Maha Energy 1 [Brazil] AB and Maha Energy 2 [Brazil] AB in Sweden. It owns an oil field in Wyoming, the United States. The Company specializes in primary, secondary and enhanced oil and gas recovery technologies, and operates a technical office in Calgary and Alberta in Canada, as well as an operations office in Newcastle and Wyoming in the United States. The Company operates as wholly-owned subsidiaries Gran Tierra Finance (Luxembourg) SARL and Gran Tierra Brazco (Luxembourg) SARL.

Parex Resources is engaged in oil and natural gas exploration, development and production in South America and the Caribbean region. As of Dec 31 2010, Co. had gross proved light and medium oil reserve of 1,066 thousand barrels (net: 980 thousand barrels).

Shamaran Petroleum is a Canadian-based oil and gas company engaged in the business of oil and gas exploration and development. Co. is in the pre-production stages of an exploration and development campaign in respect of petroleum properties located in the Kurdistan Region of Northern Iraq.

Tethys Oil AB is a Sweden-based energy company. The Company is focused on oil and gas exploration and production onshore areas with known discoveries. Its core area of focus is the Sultanate of Oman, where the Company holds licence interests in three onshore blocks. Tethys Oil has licences in three countries altogether: Oman, Lithuania and France. Two of the licenses are in production, namely Blocks 3 & 4 in Oman and Gargzdai in Lithuania. During 2013 the Company also had licenses in Sweden, however, they have expired and were not renewed. As of December 31, 2013, the Company had 10 wholly owned subsidiaries active in Sweden, Gibraltar, Switzerland and the British Virgin Islands, such as Tethys Oil Denmark AB, Tethys Oil Spain AB and Tethys Oil Turkey AB, among others.

Total is an international integrated oil and gas company also active in solar and biomass energy sources. Co. engages all aspects of the petroleum industry, including Upstream operations (oil and gas exploration, development and production, and LNG (Liquefied Natural Gas)) and Downstream operations (refining, petrochemicals, specialty chemicals, marketing and marketing and trading and shipping of crude oil and petroleum products). In addition, Co. is engaged in the coal mining and power generation sectors. Co.'s worldwide operations are conducted through three business segments: Upstream, Refining & Chemicals, and Marketing & Services.

Valeura Energy is engaged in the exploration, development and production of petroleum and natural gas in Turkey and Western Canada. As of Dec 31 2010, proven gross reserves for light and medium oil was 116 thousand barrels (net reserves of 104 thousand barrels); proven gross reserves for heavy oil was 10 thousand barrels (net reserves of 9 thousand barrels); proven gross reserves for natural gas was 1,047 million cubic feet (net reserves of 938 million cubic feet); and proven gross reserves for natural gas liquids was 26 thousand barrels (net reserves of 19 thousand barrels).

Rose Petroleum is an oil and gas (O&G) and mining company with exploration assets and an operational crushing and flotation mill. Co.'s principal activities are the exploration and development of O&G resources together with the evaluation and acquisition of other mineral exploration targets, principally gold, silver, uranium and copper, and the development and operation of mines in Mexico. In Co.'s O&G division, the area of focus is on two unconventional oil and gas basins in the U.S.: the Uinta Basin and the Paradox Basin. In its mining division, Co. continues its milling operations through its subsidiary, Minerales VANE S.A. de C.V., which owns the SDA Mill in Mexico.