| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Mar 2025 |
| 2 | A L Jones Revocable Trust | Wilson, OK 73463-7316 | Oil Operator | Jul 2013 |
| 3 | Abarr Trust (The) | Oklahoma City, OK 73179 | Oil & Gas Operator | Mar 2025 |
| 4 | Abercrombie, A. L., Inc | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 5 | Action Petroleum Service Corp | Ardmore, OK 73401 | Oil Operator | Jan 2025 |
| 6 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 7 | Aeternum Energy, LLC | Nederland, TX 77627 | Oil & Gas Operator | Jun 2025 |
| 8 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 9 | Afo LLC | Velma, OK 73491 | Oil & Gas Operator | Dec 2024 |
| 10 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 11 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 12 | Allen Michael | Broken Arrow, OK 74014-2239 | Oil & Gas Operator | Feb 2025 |
| 13 | Allen Oil & Gas LLC | Ardmore, OK 73401 | Oil Operator | Aug 2022 |
| 14 | Alligator Rock Well Service LLC | Loco, OK 73442 | Oil & Gas Operator | Mar 2025 |
| 15 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 16 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 17 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 18 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Jun 2025 |
| 19 | Americana Energy Inc | Byng, OK 74820 | Oil & Gas Operator | Feb 2025 |
| 20 | Amsito Oil Company LLC | Denton, TX 76206-0689 | Oil Operator | Apr 2001 |
| 21 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 22 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Jun 2025 |
| 23 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 24 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 25 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 26 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 27 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 28 | Apple Petroleum Corp | Mountainside, NJ 7092 | Oil Operator | Mar 2013 |
| 29 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2025 |
| 30 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Mar 2025 |
| 31 | Ardmore Production & Exploration Co | Ardmore, OK 73401 | Oil & Gas Operator | Feb 2025 |
| 32 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 33 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 34 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Mar 2025 |
| 35 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 36 | Arrow Operating Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2024 |
| 37 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 38 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 39 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Mar 2025 |
| 40 | Aycox Robert D | Healdton, OK 73438 | Oil Operator | Sep 2022 |