W. Keenan

GeoMet, Inc. is an independent energy company, which engages in the exploration, development, and production of natural gas from coal seams and non-conventional shallow gas. It also controls non-producing coal-bed methane and oil and gas development rights. The company was founded by Brett S. Camp in 1985 and is headquartered in Austin, TX.

Cinco Resources, Inc. engages in the acquisition and development of unconventional oil and natural gas resources. The company was founded by Jon L. Glass in 2002 and is headquartered in Dallas, TX.

Antero Resources LLC acquired, explored, developed and produced natural gas resources. The company was founded by Paul M. Rady and Glen C. Warren in 2002 and is headquartered in Denver, CO.

Antero Midstream Partners LP engages in owning, operating, and developing midstream energy assets. It operates through the Gathering and Processing, and Water Handling and Treatment segments. The company was founded on October 1, 2013 and is headquartered in Denver, CO.

Cima Resources Inc. provides oil and gas exploration services. The company is headquartered in Dallas, TX.

Armstrong Energy, Inc. engages in the production of low chlorine, high sulfur thermal coal from the Illinois Basin, with both surface and underground mines. The firm markets its coal primarily to proximate and investment grade electric utility companies as fuel for the steam-powered generators. The company was founded in 2006 and is headquartered in St. Louis, MO.

Coral Sea Co. Investment Partners LP operates as pooled investment firm. The company is headquartered in New York, NY.

AMGP GP LLC is an investment firm based in Denver. The American company operates as an investment firm. Paul M. Rady has been the CEO of the private company since 2017.

Yorktown Partners LLC (Yorktown Partners) is a private equity firm founded in 1983 by Bryan Huntington Lawrence, Peter August Leidel and Tomas Ramon Lacosta. The firm is headquartered in New York.

MNRL Sub, Inc. engages in the acquisition and managing of a portfolio of mineral and royalty interests. Its portfolio includes basins in the United States, consisting of the Permian Basin in Texas and New Mexico, the SCOOP and STACK plays in the Anadarko Basin of Oklahoma, the DJ Basin in Colorado and Wyoming, and the Williston Basin in North Dakota. The company was founded by Ben M. Brigham in November 2012 and is headquartered in Austin, TX.

Armstrong Energy Inc. is engages in coal mining. The company was founded on 1st September, 2006 and is headquartered in St. Louis, MO.