- First Interstate Bank of Sheridan
- Aethon Energy
- Affirmed Resources Operating, LLC
- Anschutz Exploration Company
- Azalea Oil Company, LLC
- Bear Energy Services Inc..
- BreitBurn Management Company, LLC
- Canyon Improvement & Service District
- Cassidy American Resources, LLC
- Charter Energy Partners
- Continental Resources, Inc.
- Crowheart Energy, LLC
- Darrah Oil Company, LLC
- Elk Mesa Energy, LLC
- EMIT Technologies
- Enerplus (USA) Resources
- EnerQuest Oil & Gas, LLC
- Finley Resources Inc.
- GMT Exploration Company LLC
- Green Group Holdings, LLC
- Hartz Captial, Inc.
- Herco, LLC
- Hess Bakken Investments II, LLC
- Hilcorp Energy Company
- Horseshoe Project Partners, L.P.
- Hyperion Oil and Gas, LLC
- Jonah Energy LLC
- K2T2 Resources
- Kaiser-Francis Oil Company
- Ken Haas Operating LLC
- Laris Oil and Gas
- Lighthouse Point, LLC
- Lincoln Energy Holdings, LLC
- MBI Oil and Gas, LLC
- Navigation Powder River, LLC
- Nella Partners
- Nonsuch Natural Gas, Inc.
- Norsemen Mining, LLC
- NP Resources, LLCPawnee Butte Royalties, LLC
- Peak Powder River Resources, LLC
- Petro-Hunt, L.L.C.
- Petrogulf Corporation
- PetroShale (US), Inc.
- Pony Oil
- Powder Battalion Holdings
- Primary Fuels, LLC
- Samson Exploration, LLC
- Samson Resources Company
- SHD Oil & Gas, LLC
- Sklar Exploration Company LLC
- Springfield Oil Company
- Stout Street, LLC
- Titan Exploration, LLC
- University of Wyoming
- Vermilion Energy USA LLC
- Vigil Trucking and Services
- Vitesse Energy LLC
- Wave Petroleum, LLC
- Whiting Oil and Gas Corporation
- WM of North Dakota Energy Disposal Solutions, LLC