| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Mar 2025 |
| 2 | A H & L Operating Company Inc | Norman, OK 73070-4084 | Oil & Gas Operator | Apr 2015 |
| 3 | Abarr Trust (The) | Oklahoma City, OK 73179 | Oil & Gas Operator | Mar 2025 |
| 4 | ABC Oil Co. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2023 |
| 5 | Abundance Energy I LLC | Tulsa, OK 74114 | Gas Operator | Feb 2025 |
| 6 | Abundance Energy LLC | Bartlesville, OK 74005-1087 | Oil & Gas Operator | Jul 2018 |
| 7 | Abundance Energy Services LLC | Tulsa, OK 74114 | Gas Operator | Mar 2025 |
| 8 | Adeco Energy Corporation | Norman, OK 73071 | Oil & Gas Operator | Apr 2014 |
| 9 | Adventure Properties Inc | Ada, OK 74820 | Oil & Gas Operator | Feb 2025 |
| 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 | Alexander-Loop Oil Prop. Inc. | Tulsa, OK 74105 | Oil & Gas Operator | Nov 1998 |
| 13 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 14 | Altex Oil Corp | Breckenridge, CO 80424-1057 | Oil & Gas Operator | Dec 1999 |
| 15 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 16 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 17 | American Petroleum & Mineral Co Inc | Seminole, OK 74868 | Oil & Gas Operator | Aug 2019 |
| 18 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 19 | Anc Investments LLC | Enid, OK 73701-1823 | Gas Operator | Feb 2025 |
| 20 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 21 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2025 |
| 22 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Mar 2025 |
| 23 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 24 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2025 |
| 25 | Archibald Oil & Gas Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Mar 2025 |
| 26 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Mar 2025 |
| 27 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 28 | Arkoma Gas Company | Edmond, OK 73003-5672 | Gas Operator | Apr 2010 |
| 29 | Arkoma Operations LLC | Tulsa, OK 74114-3502 | Oil & Gas Operator | Feb 2025 |
| 30 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Mar 2025 |
| 31 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Mar 2025 |
| 32 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 33 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 34 | Assiduous Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Mar 2025 |
| 35 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 36 | Athabasca Energy Corporation | Simonton, TX 77476 | Oil & Gas Operator | Dec 2017 |
| 37 | Atlantic Richfield Company | Plano, TX 75074 | Oil & Gas Operator | Dec 2016 |
| 38 | Avalon Operating LLC | Tulsa, OK 74119-5401 | Oil & Gas Operator | Mar 2025 |
| 39 | Avatar Energy LLC | Dallas, TX 75220-2230 | Oil & Gas Operator | Jul 2016 |