| 1 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Aug 2025 |
| 2 | Banding M R Inc | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 3 | Barn Owls LLC | | Oil & Gas Operator | Aug 2025 |
| 4 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | Aug 2025 |
| 5 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Aug 2025 |
| 6 | Belden & Blake Corporation | North Canton, OH 44720 | Oil & Gas Operator | Dec 2016 |
| 7 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Oct 2025 |
| 8 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Aug 2025 |
| 9 | Beta Oil Company Inc | Oklahoma City, OK 73157-2958 | Oil & Gas Operator | Dec 2022 |
| 10 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 11 | Big Basin Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Oct 2008 |
| 12 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 13 | Black Bank LLC | Billings, MT 59103 | Oil Operator | Jul 2025 |
| 14 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 15 | Black Thunder Oil LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2025 |
| 16 | Borchert R V | Sidney, NE 69162 | Oil Operator | Apr 2009 |
| 17 | Bowden Energy Company Inc | Gillette, WY 82716 | Oil & Gas Operator | Jul 2025 |
| 18 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 19 | Bradley SR Jack C | Newcastle, WY 82701 | Oil Operator | Jun 2010 |
| 20 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 21 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 22 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 23 | Burr Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2019 |
| 24 | BW Oil LLC | Hamel, MN 55340 | Oil Operator | Jun 2015 |
| 25 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 26 | BXP Operating, LLC | Houston, TX 77079 | Oil & Gas Operator | Oct 2025 |