| 1 | Balidor Oil & Gas LLC | Houston, TX 77070 | Oil & Gas Operator | Oct 2021 |
| 2 | Ballard Petroleum Holdings LLC | Billings, MT 59104 | Oil & Gas Operator | Apr 2025 |
| 3 | Banks Operating Company | | Oil & Gas Operator | Jul 1989 |
| 4 | Barn Owls LLC | | Oil & Gas Operator | Apr 2025 |
| 5 | Barrett Patrick | | Oil & Gas Operator | Apr 1988 |
| 6 | Basin Oil & Gas Operating LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Jun 2025 |
| 7 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 8 | Bass Petroleum Inc | Austin, TX 78716 | Oil & Gas Operator | Jun 2025 |
| 9 | Bearcat Energy LLC (Colorado) | Denver, CO 80202 | Oil & Gas Operator | May 2022 |
| 10 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 11 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | May 2025 |
| 12 | Big Chief Exploration | Palisades, CO 81526 | Oil & Gas Operator | Oct 1993 |
| 13 | Big Muddy Operating LLC | Casper, WY 82602 | Oil Operator | Apr 2025 |
| 14 | Bill Barrett Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2017 |
| 15 | Black Bear Oil Corporation | Las Vegas, NV 89128 | Oil & Gas Operator | Mar 2025 |
| 16 | Black Diamond Energy Inc | Pittsburgh, PA 15237 | Gas Operator | May 2016 |
| 17 | Black Gold Services Inc | Casper, WY 82644 | Oil & Gas Operator | Mar 2025 |
| 18 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 19 | Blackjack Oil, Inc. | Las Vegas, NV 89128 | Oil & Gas Operator | Nov 2019 |
| 20 | Blue Tip Energy Wyoming Inc | Houston, TX 77284 | Oil Operator | Jun 2016 |
| 21 | Bowers Oil & Gas, Inc. | Grand Junction, CO 81505-1097 | Oil & Gas Operator | Nov 2022 |
| 22 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 23 | Bright Rock Energy LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2024 |
| 24 | Bronco Oil & Gas Co | Casper, WY 82602 | Oil & Gas Operator | Oct 1987 |
| 25 | Brown Doug & Larita | Newcastle, WY 82701 | Oil & Gas Operator | Dec 2024 |
| 26 | Brown Tom Inc | Dallas, TX 75240 | Oil & Gas Operator | Mar 2015 |
| 27 | Burlington Resources Oil & Gas Company L | Gillette, WY 82718 | Oil & Gas Operator | Jan 2022 |
| 28 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 29 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |