| 1 | B&L Exploration, L.L.C. | Metairie, LA 70001 | Oil & Gas Operator | Oct 2025 |
| 2 | Baby Oil, Inc. | | Oil & Gas Operator | Oct 2017 |
| 3 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 4 | Barton Oil & Gas Co., Inc. | | Oil & Gas Operator | Sep 1993 |
| 5 | Baruch-Foster Corporation | Oklahoma City, OK 73126-6770 | Oil & Gas Operator | Feb 2001 |
| 6 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 7 | Beem Oil & Gas Company | | Oil & Gas Operator | Dec 1994 |
| 8 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 9 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 10 | Black Elk Energy Offshore Operations LLC | | Oil & Gas Operator | Jun 2016 |
| 11 | Bois D'Arc Offshore LTD. | Houston, TX 77002 | Oil & Gas Operator | Aug 2008 |
| 12 | Bois D'Arc Operating Corporation | Houston, TX 77040 | Oil & Gas Operator | Jan 2000 |
| 13 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 14 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 15 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 16 | Britlind Oil LLC | | Oil & Gas Operator | Dec 2020 |
| 17 | Brock Exploration Corporation | New Orleans, LA 70112-1707 | Oil & Gas Operator | Jan 1999 |
| 18 | Brock Petroleum Corporation | | Oil & Gas Operator | Sep 1984 |
| 19 | Browning Oil Company, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 20 | Bta Oil Producers | Midland, TX 79701 | Oil & Gas Operator | Sep 2009 |
| 21 | Bta Oil Producers, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 22 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 23 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 24 | Burnett Oil Co Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 25 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |