| 501 | Butkin Oil Company LLC | Duncan, OK 73533 | Oil & Gas Operator | Mar 2023 |
| 502 | Butler & Haseloff | Vernon, TX 76384 | Oil Operator | Jul 1993 |
| 503 | Butler B F | Hobart, OK 73651 | Oil Operator | Apr 2014 |
| 504 | Butler Petroleum Corp | Norman, OK 73069-7111 | Oil & Gas Operator | Dec 1998 |
| 505 | Butler Petroleum LLC | Van Alstyne, TX 75495 | Oil Operator | May 2020 |
| 506 | Butler, Cecil D | | Oil & Gas Operator | Sep 2025 |
| 507 | Butte Oil And Gas Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Oct 2025 |
| 508 | Buttes Resources Company | Houston, TX 77056 | Oil & Gas Operator | May 2007 |
| 509 | Buttonwood Petroleum Inc | Tulsa, OK 74136-4234 | Oil & Gas Operator | Jan 2014 |
| 510 | Buttram Energies Inc | Oklahoma City, OK 73112-7235 | Oil & Gas Operator | Nov 2021 |
| 511 | Buttram Operating Company LLC | Heath, TX 75032-1931 | Oil & Gas Operator | Sep 2025 |
| 512 | Buxton Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Apr 2014 |
| 513 | Buxton Fred M | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Feb 2007 |
| 514 | BVD Inc | Yates Center, KS 66783-0194 | Oil & Gas Operator | Oct 2025 |
| 515 | Bwab Incorporated | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 516 | BWB Resources Inc | Colorado Springs, CO 80908-7204 | Oil & Gas Operator | Jan 2016 |
| 517 | Byars Bill Inc | Okmulgee, OK 74447-0850 | Oil & Gas Operator | Apr 2015 |
| 518 | Byng Energy Group Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2025 |
| 519 | Byng Operating LLC | Ada, OK 74820-0677 | Oil & Gas Operator | Aug 2025 |