Texlark Exploration Co., Inc.

Texlark Exploration Co., Inc. discovers and develops onshore oil and natural gas resources. It has operations in Texas.

Superior Refining Company, LLC

Superior Refining Company, LLC operates the Superior Refinery in Superior, Wisconsin, which suffered an explosion and fire on April 26, 2018.

Tug Hill Operating, LLC

Tug Hill Operating, LLC engages in exploration and production of oil and natural gas in the continental US.

Marathon Oil Corporation

Marathon Oil Corporation is an oil and natural gas exploration and production company headquartered in Houston, Texas.

Bravo Arkoma, LLC

Bravo Arkoma, LLC is a Tulsa, Oklahoma company that operates the Stroehmer-1 well in Pittsburgh County, Oklahoma.

Martin Operating Partnership, LP

Martin Operating Partnership, LP, which does business as Martin Lubricants, operates gas stations and produces petroleum products.

ExxonMobil Oil Corporation

ExxonMobil Oil Corporation is a gas exploration and production company. It also offers administrative and operational services worldwide.

Exxon Mobil Corporation

Exxon Mobil Corporation is an oil and gas corporation and one of the world’s largest corporations by revenue. Its brands include Exxon, Mobil, Esso, and ExxonMobil Chemical. it is a direct descendant of John D. Rockefeller’s Standard Oil company.

Columbia Pipeline Group Services Company

Columbia Pipeline Group Services Company transports natural gas through pipelines in the US. It owns 15,000 miles of pipeline between New York and the Gulf of Mexico and large underground storage facilities.