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Calyx Energy III, LLC

Calyx Energy III, LLC, formerly Calyx Energy, LLC, produces oil and gas from wells in Oklahoma.

Kaiser-Francis Oil Company

Kaiser-Francis Oil Company engages in oil and gas exploration and production. Its parent company is GBK Corporation.

Merit Energy Company, LLC

Merit Energy Company, LLC is a large, private, US-based oil and gas company with operations in twelve states with a daily production of 65,000 barrels of oil equivalent.

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.