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Cona Resources Ltd. acquires, explores for, develops, and produces petroleum and natural gas reserves in western Canada. The company has 100% interests in the Cactus Lake property located to the south of Macklin, Saskatchewan; the Winter property located to the northwest of Unity, Saskatchewan; and the Court property located to the southeast of Kerrobert, Saskatchewan. It also has interests in the Waseca and Rex formations; and in the Thermal properties located to the southeast of Macklin, Saskatchewan. The company was formerly known as Northern Blizzard Resources Inc. and changed its name to Cona Resources Ltd. in July 2017. Cona Resources Ltd. was incorporated in 2009 and is headquartered in Calgary, Canada.

Public Joint Stock Company Rosneft Oil Company, together with its subsidiaries, engages in the exploration, development, production, and sale of crude oil and gas. It operates in two segments, Exploration and Production; and Refining and Distribution. The company produces liquid hydrocarbons in Western and Eastern Siberia, Timan-Pechora, Ural-Volga, Southern part of European Russia, and the Russian Far East. It is also involved in producing petrochemicals products; base and industrial oils; motor and transmission oils for cars and trucks, buses, agricultural and special equipment, and railway and marine transport; special oils for the aviation industry; hydraulic, gear, turbine, compressor, transformer oils, etc.; coolants, softener oils, paraffins, etc.; and additives to fuels and oils. In addition, the company transports and exports crude oil through pipelines, and railway and mixed transportation; sells petrochemicals and liquefied petroleum gas, which include phenolic chain, aromatics, polymers, olefins, alcohols, oil refinement, fuel material, and other petrochemical products; and provides bunkering and aircraft refueling services, as well as bitumen products. Further, it operates a network of filling stations. The company was founded in 1995 and is based in Moscow, Russia. Public Joint Stock Company Rosneft Oil Company operates as a subsidiary of OJSC Rosneftegaz.

Mammoth Energy Services, Inc. operates as an energy services company in the United States, Canada, and internationally. The company operates in four segments: Well Completion Services, Infrastructure Services, Natural Sand Proppant Services, and Drilling Services. The company offers pressure pumping and hydraulic fracturing, sand hauling, and water transfer services; and master services agreements. It also provides a range of services on electric transmission and distribution, and networks and substation facilities, including engineering, design, construction, upgrade, maintenance, and repair of high voltage transmission lines, substations, and lower voltage overhead and underground distribution systems; storm repair and restoration services; and commercial services comprising installation, maintenance, and repair of commercial wiring. In addition, the company mines, processes, and sells natural sand proppant used for hydraulic fracturing; buys processed sand from suppliers on the spot market for resale; and provides logistics solutions to facilitate delivery of frac sand products. Further, it offers contract land and directional drilling services; and rig moving services. Additionally, the company offers aviation services, equipment rental, remote accommodation, and equipment manufacturing services. It serves government-funded, private, public investor-owned, and co-operative utilities; independent oil and natural gas producers; and land-based drilling contractors. The company was formerly known as Mammoth Energy Partners LP and changed its name to Mammoth Energy Services, Inc. in October 2016. Mammoth Energy Services, Inc. was founded in 2014 and is headquartered in Oklahoma City, Oklahoma.