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.