| 1 | A J S Oil Corporation | Oklahoma City, OK 73112-4799 | Oil & Gas Operator | Jul 2004 |
| 2 | A R W Exploration Corp | Stillwater, OK 74076 | Oil & Gas Operator | May 2013 |
| 3 | Aaron Well Service Inc | Enid, OK 73703-9300 | Gas Operator | Sep 2024 |
| 4 | Ac Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Sep 2024 |
| 5 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 6 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 7 | Agate Petroleum, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2015 |
| 8 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 9 | Allied Petroleum Company | | Gas Operator | Dec 1992 |
| 10 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2024 |
| 11 | American Energy Recovery Inc | Oklahoma City, OK 73123-0549 | Oil & Gas Operator | Aug 2017 |
| 12 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2023 |
| 13 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 14 | Amplify Oklahoma Operating LLC | Houston, TX 77002-4800 | Oil & Gas Operator | Sep 2024 |
| 15 | Amsler Jerry & Denese | Enid, OK 73703-9300 | Oil & Gas Operator | Jul 2020 |
| 16 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Dec 2024 |
| 17 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2024 |
| 18 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 19 | Ancova Energy Marketing LLC | Oklahoma City, OK 73103 | Oil & Gas Operator | Sep 2024 |
| 20 | Andrea Operating Company | Edmond, OK 73013-6627 | Oil & Gas Operator | Sep 2024 |
| 21 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 22 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Sep 2024 |
| 23 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Dec 2024 |
| 24 | Armor Energy II LLC | Tulsa, OK 74145 | Oil & Gas Operator | Oct 2024 |
| 25 | Armor Energy LLC | Tulsa, OK 74146 | Oil & Gas Operator | Jun 2022 |
| 26 | Arp Oklahoma LLC | Fort Worth, TX 76102-7426 | Oil & Gas Operator | Feb 2020 |
| 27 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Dec 2024 |
| 28 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 29 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 30 | Associated Trans & Trading Co | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 1998 |
| 31 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Oct 2024 |
| 32 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 33 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2024 |
| 34 | Avra Oil Co | Dallas, TX 75248 | Oil & Gas Operator | Dec 2024 |