| 1 | B K L Incorporated | Morton, TX 79346 | Oil & Gas Operator | Jun 2002 |
| 2 | B M Oil, Inc. | | Oil & Gas Operator | May 2019 |
| 3 | B&L Exploration, L.L.C. | Metairie, LA 70001 | Oil & Gas Operator | Oct 2025 |
| 4 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 5 | Badger Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 6 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 7 | Balco Energy Corporation | | Oil & Gas Operator | Jul 1983 |
| 8 | Bargo Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 9 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 10 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 11 | Bay Coquille, Inc. | | Oil & Gas Operator | Jun 2023 |
| 12 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 13 | Bepco, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2008 |
| 14 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 15 | Billingsley Engineering Co. | | Oil & Gas Operator | May 1994 |
| 16 | Bison Energy Partners, LLC | | Oil & Gas Operator | Jan 2025 |
| 17 | Bke-Theall, LLC | | Oil & Gas Operator | Feb 2000 |
| 18 | Black Gold Production Company | | Oil & Gas Operator | Feb 1998 |
| 19 | Blackjack Operating L. L. C. | Cibolo, TX 78108 | Oil & Gas Operator | Oct 2025 |
| 20 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 21 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 22 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 23 | Bradco Oil & Gas Company | | Oil & Gas Operator | Dec 1980 |
| 24 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 25 | Brbco, LLC | | Oil & Gas Operator | Dec 2024 |
| 26 | Brock Petroleum Corporation | | Oil & Gas Operator | Sep 1984 |
| 27 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 28 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 29 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 30 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |