| 1 | B & D Operating Company | | Oil & Gas Operator | Apr 1990 |
| 2 | B. L. Ainsworth | | Oil Operator | Dec 1988 |
| 3 | Bass Enterprises Production Co | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2006 |
| 4 | Bass-Franks | | Oil & Gas Operator | Jun 1997 |
| 5 | Beard Oil Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Aug 2013 |
| 6 | Beebe And Beebe | | Oil & Gas Operator | Jun 2000 |
| 7 | Big Pine Petroleum Inc. | | Oil & Gas Operator | Dec 2024 |
| 8 | Black Gold Prod Co., Inc. | | Oil & Gas Operator | Feb 1998 |
| 9 | Blackbeard Operating East LLC | Midland, TX 79701-4532 | Oil & Gas Operator | Dec 2020 |
| 10 | Blackbird Company | Shreveport, LA 71106 | Oil & Gas Operator | Jan 2025 |
| 11 | Blanco Oil Co., Etal | | Oil Operator | Aug 1985 |
| 12 | Bob L. Herd | | Oil & Gas Operator | Dec 1979 |
| 13 | Bob L. Herd & Petrofunds | | Oil & Gas Operator | Mar 1984 |
| 14 | Bolinger Oil L.L.C. | | Oil Operator | Dec 2024 |
| 15 | Bopco, L.P. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 16 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2025 |
| 17 | Branch Investment Corporation | | Oil & Gas Operator | Jan 2025 |
| 18 | Breitburn Operating LP | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 19 | BRG Petroleum Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2020 |
| 20 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 21 | Broco Oil, LP | | Oil & Gas Operator | Nov 2024 |
| 22 | Brookston Energy, Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 23 | Bryant Oil & Gas Corporation | | Oil & Gas Operator | Mar 1987 |
| 24 | Buffco Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Dec 2025 |
| 25 | Burk Royalty Co., LTD. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 26 | Byron Ruple | | Oil Operator | Jan 2025 |