| 1 | B & L Pump & Supply Company | | Oil & Gas Operator | Mar 2025 |
| 2 | B & S Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Apr 2025 |
| 3 | B. D. & D. Co. | | Gas Operator | Dec 1992 |
| 4 | B. E. Conway Energy Inc. | | Oil & Gas Operator | Apr 2025 |
| 5 | B5 Holdings LLC | | Oil Operator | Mar 2025 |
| 6 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 7 | Baker Oil And Gas Company | | Gas Operator | Dec 1997 |
| 8 | Baker-Dickey Partnership | | Oil Operator | Dec 1992 |
| 9 | Bakersfield Energy Resources Inc. | | Oil & Gas Operator | Dec 1998 |
| 10 | Bali Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 11 | Ballard Oil Inc. | | Oil & Gas Operator | Apr 2025 |
| 12 | Barco Oil Co. | | Oil Operator | Dec 2009 |
| 13 | Barham-Boyne Oil Co. Inc. | | Oil Operator | Dec 1992 |
| 14 | Barto Oil Co. | | Oil & Gas Operator | Dec 1992 |
| 15 | Bayshore-Long Beach LLC | | Oil & Gas Operator | Dec 2000 |
| 16 | Bayswater Exploration & Production LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 17 | Beach Supply Co. | | Oil Operator | Dec 1987 |
| 18 | Beacon Oil Company | | Oil Operator | Dec 1985 |
| 19 | Bechtel Petroleum Operations Inc. | | Oil & Gas Operator | Dec 1997 |
| 20 | Bellaire Oil Company | | Oil & Gas Operator | Apr 2025 |
| 21 | Bellevue Resources Inc | Lakewood, CO 80235 | Oil & Gas Operator | Feb 2009 |
| 22 | Belridge Energy Resources Inc. | | Oil & Gas Operator | Mar 2025 |
| 23 | Bennett Petroleum Inc. | | Oil & Gas Operator | Mar 2025 |
| 24 | Bentley Family Limited Partnership | | Oil & Gas Operator | Feb 2023 |
| 25 | Benton Oil & Gas | | Gas Operator | Dec 1992 |
| 26 | Berenergy Corporation | Denver, CO 80217 | Oil & Gas Operator | May 2025 |
| 27 | Berkley Petroleum Inc. | | Oil & Gas Operator | Dec 2007 |
| 28 | Berry Petroleum Company | Denver, CO 80202 | Oil & Gas Operator | Feb 2014 |
| 29 | Berry Petroleum Company LLC | Bakersfield, CA 93311 | Oil & Gas Operator | Apr 2025 |
| 30 | Beverly Hills Oil Co. | | Oil & Gas Operator | Dec 1979 |
| 31 | Big Horn Oil And Gas Inc. | | Gas Operator | Mar 2025 |
| 32 | Big Valley Resources | | Oil Operator | Dec 2008 |
| 33 | Big West Of California LLC | | Oil & Gas Operator | Dec 2018 |
| 34 | Black Badger Energy LLC. | | Oil Operator | Apr 2025 |
| 35 | Black Gold Oil Company | Duncan, OK 73533-1581 | Oil & Gas Operator | Mar 2025 |
| 36 | Black Mountain Oil Co. | | Oil & Gas Operator | Dec 1999 |
| 37 | Black Velvet Petro. Co. | | Oil & Gas Operator | Dec 2007 |
| 38 | Blackhawk Oil Co | Ottawa, KS 66067 | Oil & Gas Operator | Jan 2011 |
| 39 | Bloomfield Partners II LLC | | Oil & Gas Operator | Dec 2005 |
| 40 | Bob Crupper | | Oil Operator | Dec 1995 |
| 41 | Bob Ferguson Independent | | Oil & Gas Operator | Dec 2020 |
| 42 | Bobbie G. & Vallee J. Williams | | Oil & Gas Operator | Dec 1991 |
| 43 | Bonanza Creek Energy Operating Company LLC | | Oil & Gas Operator | Mar 2025 |
| 44 | Botto And Miller Trustees | | Oil & Gas Operator | Dec 1993 |
| 45 | Bradley Muhl And Associates | | Oil & Gas Operator | Dec 1993 |
| 46 | Brayton-Hodges Petroleum Inc. | | Oil & Gas Operator | Mar 2025 |
| 47 | Brea Canon Oil Co. | | Oil & Gas Operator | Apr 2025 |
| 48 | Brea Oil Company Inc. | | Oil & Gas Operator | Oct 2001 |
| 49 | Breitburn Operating LP | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 50 | Bridge Energy LLC | | Oil & Gas Operator | Apr 2025 |
| 51 | Bridge Point Carson LLC | | Oil & Gas Operator | Apr 2025 |
| 52 | Bridgeland Resources LLC | | Oil & Gas Operator | Mar 2025 |
| 53 | Bridgemark Corporation | | Oil & Gas Operator | Mar 2025 |
| 54 | Brindle/Thomas | | Oil & Gas Operator | Dec 2023 |
| 55 | Brittany Oil Co. | | Oil & Gas Operator | Dec 2022 |
| 56 | Brknco LLC | | Oil & Gas Operator | Dec 2025 |
| 57 | Brogdon--A&K Leases | | Oil & Gas Operator | Dec 2001 |
| 58 | Bruce A. Holmes | | Oil & Gas Operator | Dec 2022 |
| 59 | Bruce Anderson | | Oil Operator | Dec 1998 |
| 60 | Bud'S Oil Company Inc. | Sperry, OK 74073 | Oil & Gas Operator | Dec 2025 |
| 61 | Bunker Oil Corp. | | Oil & Gas Operator | Dec 1994 |