| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Jul 2025 |
| 2 | Abps Energy Inc | Chickasha, OK 73023-1658 | Oil & Gas Operator | Apr 2015 |
| 3 | Adams Res & Energy Co | Houston, TX 77001-0844 | Oil & Gas Operator | Mar 2015 |
| 4 | Adparo LLC | Oklahoma City, OK 73102-4803 | Oil & Gas Operator | Jul 2025 |
| 5 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Jul 2025 |
| 6 | Aguila Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 7 | Alan Energy Coinc The/Ofb | | Gas Operator | Aug 1991 |
| 8 | Aleco Production Company | | Oil & Gas Operator | Nov 1997 |
| 9 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 10 | Alexander, Howard | Tulsa, OK 74114 | Oil & Gas Operator | Feb 1996 |
| 11 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 12 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 13 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 14 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 15 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 16 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 17 | Anderson Floyd Melton Revocable Trust | Yukon, OK 73099 | Oil & Gas Operator | Oct 2024 |
| 18 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 19 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 20 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Jun 2025 |
| 21 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 22 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 23 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 24 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 25 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 26 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jun 2025 |
| 27 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 28 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 29 | Arnold Oil Properties, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2019 |
| 30 | Arnold Oil Properties, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Oct 2025 |
| 31 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Oct 2025 |
| 32 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 33 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 34 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 35 | Astro Corporation | Tulsa, OK 74145 | Oil & Gas Operator | Apr 2007 |
| 36 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Oct 2025 |
| 37 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Oct 2025 |
| 38 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 39 | Axem Resources Inc | Denver, CO 80202-4617 | Oil & Gas Operator | Jul 2013 |
| 40 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Jun 2025 |