| 1 | B & B Oil Company LTD | | Gas Operator | Mar 2020 |
| 2 | Ballard Petroleum LLC | Billings, MT 59102-5406 | Oil & Gas Operator | Apr 2014 |
| 3 | Baney Well Service Inc | Denver, CO 80237 | Oil Operator | Jun 2016 |
| 4 | Barfield Oil Corporation | | Oil & Gas Operator | Mar 2001 |
| 5 | Barrett Corporation* Bill | | Oil & Gas Operator | Jul 2025 |
| 6 | Barrett Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 7 | Basin Exploration Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 8 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 9 | Bataa Oil Inc | Arvada, CO 80005 | Oil & Gas Operator | Aug 2025 |
| 10 | Bates* James Edward | | Oil & Gas Operator | Jul 2017 |
| 11 | Bayhorse Petroleum LLC | | Oil Operator | Dec 2016 |
| 12 | Bayless Producer LLC* Robert L | | Oil & Gas Operator | Jul 2025 |
| 13 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 14 | Beartooth Oil & Gas Company | Billings, MT 59103 | Oil & Gas Operator | Aug 2025 |
| 15 | Becca Oil LLC | Cushing, OK 74023-1347 | Oil & Gas Operator | Jun 2025 |
| 16 | Beeman Oil & Gas LLC | | Oil & Gas Operator | Aug 2025 |
| 17 | Belco Energy Corp. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 18 | Benchmark Energy LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2023 |
| 19 | Benchmark Oil & Gas Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 20 | Benson-Montin-Greer DRLG Corp | Farmington, NM 87402 | Oil & Gas Operator | Aug 2025 |
| 21 | Bepco Operating Co. | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2006 |
| 22 | Beren Corporation | Wichita, KS 67206 | Oil & Gas Operator | Oct 2025 |
| 23 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | Aug 2025 |
| 24 | Berexco LLC | Wichita, KS 67206 | Oil & Gas Operator | Oct 2025 |
| 25 | Berry Energy Inc*Walter | | Oil & Gas Operator | Feb 2017 |
| 26 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Aug 2025 |
| 27 | Bic Petroleum Inc | | Oil & Gas Operator | Sep 2002 |
| 28 | Big Run Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 29 | Bison Energy Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2022 |
| 30 | Bison IV Operating LLC | | Oil & Gas Operator | Aug 2025 |
| 31 | Black Diamond Minerals LLC | | Oil & Gas Operator | Jun 2014 |
| 32 | Black Hills Exploration & Production Inc | Newcastle, WY 82701 | Oil & Gas Operator | May 2018 |
| 33 | Black Hills Plateau Production LLC | | Oil & Gas Operator | May 2018 |
| 34 | Black Raven Energy Inc | | Oil & Gas Operator | Apr 2017 |
| 35 | Blackrock Energy Corp | | Oil Operator | Jul 2025 |
| 36 | Blue & Gray Energy Inc | | Oil & Gas Operator | Jun 2011 |
| 37 | Blue Chip Oil Inc | | Oil & Gas Operator | Jul 2025 |
| 38 | Blue Creek Inc | Fort Worth, TX 76181 | Oil & Gas Operator | Dec 2002 |
| 39 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Jul 2025 |
| 40 | Bonneville Fuels Corp | Denver, CO 80290 | Oil & Gas Operator | Jun 2002 |
| 41 | Booco'S Contract Services Inc | | Oil & Gas Operator | Jan 2021 |
| 42 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 43 | Boulder Oil Company | | Oil & Gas Operator | Sep 2004 |
| 44 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 45 | Brandly Oilman Consultants Inc | | Oil & Gas Operator | Mar 2006 |
| 46 | Bright & Company | The Colony, TX 75056 | Oil & Gas Operator | May 2015 |
| 47 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 48 | Brito Oil Co., Inc | Wichita, KS 67201 | Oil & Gas Operator | Dec 2009 |
| 49 | Brooks Exploration, Inc. | Denver, CO 80293 | Oil & Gas Operator | Mar 2001 |
| 50 | Brown Oil & Gas LLC | | Oil & Gas Operator | Jul 2025 |
| 51 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 52 | Btu Energy | | Gas Operator | Aug 2009 |
| 53 | Burlington Resources Oil & Gas LP | | Oil & Gas Operator | Feb 2020 |
| 54 | Burr Oil & Gas Inc | Farmington, NM 87499 | Oil & Gas Operator | Oct 2019 |
| 55 | Byron Oil Industries Inc | Ballwin, MO 63011 | Oil & Gas Operator | Apr 2019 |