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Alliance Resource Partners, L.P., a diversified natural resource company, produces and markets coal primarily to utilities and industrial users in the United States. The company operates through four segments: Illinois Basin Coal Operations, Appalachia Coal Operations, Oil & Gas Royalties, and Coal Royalties. It produces a range of thermal and metallurgical coal with sulfur and heat contents. The company operates seven underground mining complexes in Illinois, Indiana, Kentucky, Maryland, Pennsylvania, and West Virginia. In addition, it owns and leases oil and gas mineral interests and equity interests; and leases its coal mineral reserves and resources to its mining complexes; and leases land and operates a coal loading terminal on the Ohio River at Mt. Vernon, Indiana. Further, the company offers various mining technology products and services, including data network, communication and tracking systems, mining proximity detection systems, industrial collision avoidance systems, and data and analytics software. It also exports its products. The company was founded in 1971 and is headquartered in Tulsa, Oklahoma.

PDC Energy, Inc., an independent exploration and production company, acquires, explores for, develops, and produces crude oil, natural gas, and natural gas liquids in the United States. The company's operations are primarily located in the Wattenberg Field in Colorado and the Delaware Basin in Texas. The company was formerly known as Petroleum Development Corporation and changed its name to PDC Energy, Inc. in June 2012. PDC Energy, Inc. was founded in 1969 and is headquartered in Denver, Colorado.

Sunrun Inc. designs, develops, installs, sells, owns, and maintains residential solar energy systems in the United States. It also sells solar energy systems and products, such as panels and racking; and solar leads generated to customers. In addition, the company offers battery storage along with solar energy systems; and sells services to commercial developers through multi-family and new homes. Its primary customers are residential homeowners. The company markets and sells its products through direct-to-consumer approach across online, retail, mass media, digital media, canvassing, field marketing, and referral channels, as well as its partner network. Sunrun Inc. was founded in 2007 and is headquartered in San Francisco, California.

Tullow Oil plc engages in the oil and gas exploration, development, and production activities primarily in Africa, Europe, and South America. The company was founded in 1985 and is headquartered in London, the United Kingdom.