| 1 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Aug 2025 |
| 2 | Bannon Energy Inc | Houston, TX 77068 | Oil & Gas Operator | Jun 1998 |
| 3 | Barrel Springs Development Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 1986 |
| 4 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 5 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | Aug 2025 |
| 6 | Bayless Robert L Producer | Denver, CO 80293 | Oil & Gas Operator | Sep 2003 |
| 7 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 8 | Bce-Mach LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2025 |
| 9 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 10 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 11 | BHP Petroleum (USA) Inc | | Oil & Gas Operator | Mar 1993 |
| 12 | Big Piney Oil & Gas Company | Dallas, TX 75206 | Oil & Gas Operator | Sep 1992 |
| 13 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 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 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 17 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 18 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 19 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 20 | Breck Operating Corp. | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 21 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 22 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 23 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 24 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 25 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |