| 1 | A & P Oil & Gas | Leona, TX 75850 | Oil Operator | May 2024 |
| 2 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 3 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 4 | Activa Resources, LLC | San Antonio, TX 78205 | Oil & Gas Operator | May 2024 |
| 5 | Af Operating, LLC | Tuscaloosa, AL 35404 | Oil Operator | Sep 2012 |
| 6 | Allied Operating Texas, LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2024 |
| 7 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | May 2024 |
| 8 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 9 | Alpine Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 10 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | May 2024 |
| 11 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 12 | American Cascade Energy, Inc. | Barker, TX 77413 | Oil & Gas Operator | May 2024 |
| 13 | American Cometra, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2008 |
| 14 | American Energy Op. Corp.,The | Houston, TX 77099 | Oil & Gas Operator | May 2024 |
| 15 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 16 | American Oilfield Systems, Inc. | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 2001 |
| 17 | American Royalty | Caldwell, TX 77836 | Oil & Gas Operator | Oct 2005 |
| 18 | Amerril Energy LLC | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 19 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 20 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 21 | Amx Energy, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 22 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 23 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 24 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 25 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 26 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2024 |
| 27 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 28 | Argent Energy, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 29 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 30 | Arrowhead Energy Exp., LLC | Baton Rouge, LA 70816 | Oil & Gas Operator | Nov 2006 |
| 31 | Arrowhead Enterprises, Inc. | Baton Rouge, LA 70816 | Oil & Gas Operator | Apr 2001 |
| 32 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 33 | Asm Oil & Gas Company, Inc. | Dallas, TX 75367 | Oil & Gas Operator | May 2020 |
| 34 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 35 | Atkinson Energy Corporation | Giddings, TX 78942 | Oil & Gas Operator | Jan 2010 |
| 36 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 37 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | May 2024 |