| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2024 |
| 2 | Abundance Energy I LLC | | Gas Operator | Jan 2024 |
| 3 | Alda Oil & Gas Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | Jan 2004 |
| 4 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 5 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2023 |
| 6 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 7 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jan 2024 |
| 8 | Anr Pipeline Company | Detroit, MI 48243 | Oil & Gas Operator | Dec 2023 |
| 9 | Ardmore Production & Exploration Co | Ardmore, OK 73402-1988 | Oil & Gas Operator | Feb 2024 |
| 10 | Arkana Operating Company Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 11 | Arkoma Operations LLC | | Oil & Gas Operator | Jan 2024 |
| 12 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2024 |
| 13 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2024 |
| 14 | Aruba Petroleum Inc | Dallas, TX 75379 | Oil & Gas Operator | Dec 2023 |
| 15 | Aspen Land & Exploration Co | Tulsa, OK 74159-0335 | Oil & Gas Operator | Jul 2001 |
| 16 | Athabasca Energy Corporation | Simonton, TX 77476-0364 | Oil & Gas Operator | Dec 2017 |