| 1 | Badger Oil Corporation | Lafayette, LA 70505 | Oil & Gas Operator | Nov 2011 |
| 2 | Ballard Exploration Company,Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 3 | Basf Corporation | Houston, TX 77027 | Oil & Gas Operator | Nov 1992 |
| 4 | Bean Resources, Inc. | | Oil & Gas Operator | Aug 2006 |
| 5 | Beem Oil & Gas Company | | Oil & Gas Operator | Dec 1994 |
| 6 | Bel Oil Corporation | Jenks, OK 74037 | Oil & Gas Operator | Jun 2005 |
| 7 | Bellwether Exploration Company | Houston, TX 77010 | Oil & Gas Operator | May 2001 |
| 8 | BHP Billiton Petro (KCS Resources), LLC | | Oil & Gas Operator | Jul 2019 |
| 9 | BHP Petroleum (Americas) Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 10 | Black Diamond Production Co. | | Oil & Gas Operator | Mar 2021 |
| 11 | Blakely Land & Exploration Co. | | Oil & Gas Operator | Apr 1991 |
| 12 | Boca Production Inc | | Oil & Gas Operator | Jun 2002 |
| 13 | Borden, Inc. | Columbus, OH 43215 | Oil & Gas Operator | May 1990 |
| 14 | BP America Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 15 | BP Exploration Inc | | Oil & Gas Operator | May 1993 |
| 16 | BPX (KCS Resources), LLC | | Oil & Gas Operator | Feb 2022 |
| 17 | BPX Operating Company | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 18 | Brammer Engineering, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 19 | Breakthrough Ventures, LLC | | Oil Operator | Jan 2025 |
| 20 | Brechtel Energy Corporation | | Oil & Gas Operator | Sep 2008 |
| 21 | Breton Sound Holdings, LLC | | Oil & Gas Operator | Dec 2024 |
| 22 | Bristol Resources Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Feb 2022 |
| 23 | British-Borneo Exploration Inc | | Oil & Gas Operator | Dec 1999 |
| 24 | Burlington Res Offshore Inc | | Oil & Gas Operator | Oct 2002 |
| 25 | Burlington Res Oil & Gas Co | | Oil & Gas Operator | Dec 2000 |
| 26 | Burlington Res Oil & Gas LP | | Oil & Gas Operator | Mar 2013 |
| 27 | Burton-Sutton Oil Co., Inc. | | Oil & Gas Operator | Apr 1988 |