| 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 | Agave Energy, Inc | Stigler, OK 74462 | Oil & Gas Operator | Jan 2024 |
| 4 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 5 | Alexander Oil Company | Loco, OK 73442-9409 | Oil & Gas Operator | Dec 2023 |
| 6 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 7 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 8 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 9 | Amoco Energy Trading Corp | Chicago, IL 60601 | Oil & Gas Operator | Apr 2021 |
| 10 | An-Son Corporation | Oklahoma City, OK 73124-0060 | Oil & Gas Operator | Jan 2006 |
| 11 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2024 |
| 12 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2024 |
| 13 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Jan 2024 |
| 14 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 15 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 16 | Arkansas Oklahoma Gas Corporation | Fort Smith, AR 72917 | Oil & Gas Operator | Aug 2022 |
| 17 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 18 | Arkoma Holding Corporation | Oklahoma City, OK 73102-5684 | Gas Operator | Jul 2007 |
| 19 | Arkoma Operations LLC | | Oil & Gas Operator | Jan 2024 |
| 20 | Arkoma Production Company | Shreveport, LA 71101 | Gas Operator | Apr 2020 |
| 21 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2024 |
| 22 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2024 |
| 23 | Atlantic Richfield Company | Plano, TX 75094-1744 | Oil & Gas Operator | Dec 2016 |
| 24 | Atls Production Company LLC | | Gas Operator | Sep 2020 |
| 25 | Auora Natural Gas & Assoc Prod | Dallas, TX 75205 | Oil & Gas Operator | Dec 2000 |