| 1 | A & A Tank Truck Company | Norman, OK 73070-8969 | Oil & Gas Operator | Feb 2026 |
| 2 | A & H Disposal Inc | Lindsay, OK 73052-0456 | Oil & Gas Operator | Jul 2019 |
| 3 | Abps Energy Inc | Chickasha, OK 73023-1658 | Oil & Gas Operator | Apr 2015 |
| 4 | Ac Oil & Gas LLC | Hennessey, OK 73742 | Oil & Gas Operator | Feb 2026 |
| 5 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | Apr 2026 |
| 6 | Adeco Energy Corporation | Norman, OK 73071 | Oil & Gas Operator | Apr 2014 |
| 7 | Adobe Oil & Gas Corporation | Midland, TX 79701 | Oil & Gas Operator | Jan 1993 |
| 8 | Adobe Resources Corporation | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 9 | Aei Production Company | Edmond, OK 73083 | Oil & Gas Operator | Mar 2014 |
| 10 | Aethon I LP | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 11 | Agar & Agar Inc | Norman, OK 73070 | Oil & Gas Operator | Oct 1996 |
| 12 | Alexander Energy Corporation | Dallas, TX 75206 | Oil & Gas Operator | Apr 2015 |
| 13 | Alpine Inc | Oklahoma City, OK 73134-2504 | Oil & Gas Operator | Feb 2024 |
| 14 | Alsup 1-19 LLC | Lindsay, OK 73052 | Oil Operator | Dec 2025 |
| 15 | Altman Energy, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Apr 2026 |
| 16 | Alvarado 2014 LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 17 | Amax Oil & Gas Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 18 | Amer-Tex Energy Inc | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Feb 2012 |
| 19 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 20 | American Petrofina Co Of TX | Dallas, TX 75221-2159 | Oil & Gas Operator | Nov 2000 |
| 21 | American Petroleum Corp | Addison, TX 75001 | Oil & Gas Operator | Apr 2026 |
| 22 | American Trading & Prod Corp | Houston, TX 77040-6471 | Oil & Gas Operator | Nov 2014 |
| 23 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 24 | An-Son Corp | Oklahoma City, OK 73124 | Oil & Gas Operator | Jan 2006 |
| 25 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Apr 2026 |
| 26 | Anadarko Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 27 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Feb 2026 |
| 28 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 29 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 30 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 31 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Apr 2026 |
| 32 | Apache Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 33 | Arbuckle Enterprises Inc | Edmond, OK 73083 | Oil & Gas Operator | Jan 2026 |
| 34 | Ardent Energy LLC | Edmond, OK 73083 | Oil & Gas Operator | Apr 2026 |
| 35 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 36 | Aries Operating, LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2026 |
| 37 | Arkana Operating Company Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 38 | Arkoma Operations LLC | Tulsa, OK 74114-3502 | Oil & Gas Operator | Jan 2026 |
| 39 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Feb 2026 |
| 40 | Aroc (Texas) Inc. | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 41 | Arrow Energy, Incorporated | Houston, TX 77008 | Oil & Gas Operator | Feb 2026 |
| 42 | Arrow Oil & Gas, LLC | Norman, OK 73070 | Oil & Gas Operator | Apr 2026 |
| 43 | Arrow Operating Company | Dallas, TX 75231 | Oil & Gas Operator | Jan 2026 |
| 44 | Arrowhead Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 45 | Arvine Pipe & Supply Co Inc | Norman, OK 73069-8224 | Oil & Gas Operator | Jul 2015 |
| 46 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 47 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2026 |
| 48 | Atchley Resources, Inc. | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2026 |
| 49 | Atlantic Richfield Company | Houston, TX 77079 | Oil & Gas Operator | Dec 2016 |
| 50 | Atwell, David L. | Duncan, OK 73533 | Oil & Gas Operator | Jul 2003 |
| 51 | Austin Production Company, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Mar 2015 |
| 52 | Azure Energy LTD | Tulsa, OK 74135-7825 | Oil & Gas Operator | Feb 2026 |