| 1 | B & M Operating Co., Inc. | Houston, TX 77006 | Oil & Gas Operator | Dec 2025 |
| 2 | B M Oil, Inc. | | Oil & Gas Operator | May 2019 |
| 3 | Baca Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2000 |
| 4 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 5 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 6 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 7 | Basin Petroleum, Inc. | | Oil & Gas Operator | Jul 1995 |
| 8 | Belnorth Petroleum Corporation | Midland, TX 79701 | Oil & Gas Operator | Feb 1991 |
| 9 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 10 | BKV Ventures, LLC | | Oil & Gas Operator | Nov 2020 |
| 11 | Block "T" Petroleum, Inc. | Tyler, TX 75707 | Oil & Gas Operator | Dec 2025 |
| 12 | Block T Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2025 |
| 13 | Bralorne International, Inc. | | Oil Operator | Jan 1987 |
| 14 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 15 | Brehm Exploration, Inc. | | Oil & Gas Operator | Mar 1995 |
| 16 | Brighton Energy, L.L.C. | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2015 |
| 17 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 18 | Brock Exploration Corp | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 19 | Brown & McKenzie, Inc. | | Oil & Gas Operator | May 1984 |
| 20 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 21 | Bse Production Co. | Victoria, TX 77903 | Oil & Gas Operator | Dec 2025 |
| 22 | Buckeye Petroleum Company, Inc | | Oil & Gas Operator | Apr 1983 |
| 23 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 24 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 25 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |