| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Mar 2025 |
| 2 | Ac Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Mar 2025 |
| 3 | Aexco Petroleum Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 4 | Aguila Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2025 |
| 5 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 6 | Alexander Oil Co. | Loco, OK 73442-9409 | Oil & Gas Operator | Mar 2025 |
| 7 | Almont Energy LLC | Kingfisher, OK 73750-0901 | Oil & Gas Operator | Oct 2021 |
| 8 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Jun 2025 |
| 9 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Jun 2025 |
| 10 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 11 | Amax Petroleum Corporation | Houston, TX 77042 | Oil & Gas Operator | Dec 2012 |
| 12 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 13 | American Natural Energy Corp | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 14 | An-Son Corporation | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 15 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 16 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Mar 2025 |
| 17 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 18 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 19 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 20 | Apache Energy Resources Corp | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 21 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 22 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Jun 2025 |
| 23 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 24 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Feb 2025 |
| 25 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 26 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 27 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Mar 2025 |
| 28 | Armor Energy LLC | Tulsa, OK 74146 | Oil & Gas Operator | Jun 2022 |
| 29 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 30 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 31 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 32 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 33 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 34 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Mar 2025 |
| 35 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Jun 2025 |
| 36 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 37 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Jun 2025 |
| 38 | Avalon Exploration Inc | Tulsa, OK 74119-5401 | Oil & Gas Operator | Dec 2019 |
| 39 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Mar 2025 |