| 1 | B & B Oilfield Services Inc | Windham, OH 44288 | Oil & Gas Operator | Dec 2023 |
| 2 | B. D. Evans Oil Co. | | Oil & Gas Operator | Jun 2017 |
| 3 | Bakken Hunter, LLC | | Oil & Gas Operator | Jun 2017 |
| 4 | Ballantyne Oil | | Oil & Gas Operator | Jul 2010 |
| 5 | Ballantyne Oil, LLC | | Oil & Gas Operator | Mar 2023 |
| 6 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Sep 2024 |
| 7 | Barbara Fasken | Midland, TX 79701 | Oil & Gas Operator | Dec 1995 |
| 8 | Barron Kidd-Great American Exploration | | Oil Operator | Dec 1968 |
| 9 | Basic Earth Science Systems, Inc. | Austin, TX 78714 | Oil & Gas Operator | Apr 2010 |
| 10 | Baytex Energy USA LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2014 |
| 11 | Baytex Energy USA LTD | | Oil & Gas Operator | Sep 2014 |
| 12 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Sep 2024 |
| 13 | Behm Energy, Inc. | Minot, ND 58702 | Oil & Gas Operator | Sep 2024 |
| 14 | Berco Resources LLC | Denver, CO 80206 | Oil & Gas Operator | Sep 2009 |
| 15 | Berco Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Feb 2002 |
| 16 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Sep 2024 |
| 17 | Big Sky Well Service, Inc. | | Oil & Gas Operator | Aug 2018 |
| 18 | Bigiron Oil & Gas LLC | | Oil & Gas Operator | Sep 2024 |
| 19 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 20 | Black Hawk Resources, LLC | Bowman, ND 58623 | Oil & Gas Operator | Jun 2011 |
| 21 | Bonray Energy Corp. | | Oil & Gas Operator | Jun 1985 |
| 22 | Bow Petroleum, Inc. Of Colorado | | Oil & Gas Operator | Sep 2024 |
| 23 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 24 | Bowline Energy LLC | Denver, CO 80201 | Oil & Gas Operator | Dec 2022 |
| 25 | Brent Exploration Inc. | | Oil & Gas Operator | Apr 1983 |
| 26 | Brigham Oil & Gas, L.P. | Austin, TX 78730 | Oil & Gas Operator | Oct 2015 |
| 27 | Brooks Exploration, Inc. | Denver, CO 80293 | Oil & Gas Operator | Mar 2001 |
| 28 | Broschat Engineering & Management Services, Inc. | | Oil & Gas Operator | May 2017 |
| 29 | Bruin E&P Operating, LLC | | Oil & Gas Operator | Oct 2021 |
| 30 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 31 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 32 | Burlington Resources Oil & Gas Company LP | Houston, TX 77252 | Oil & Gas Operator | Nov 2024 |
| 33 | Burlington Resources Oil And Gas Co. | Houston, TX 77210 | Oil & Gas Operator | Mar 2023 |
| 34 | Burnett Energy Inc. | | Oil & Gas Operator | Sep 2024 |
| 35 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2024 |
| 36 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |