| 1 | Ak Pearson Family Trust | Amarillo, TX 79114 | Oil Operator | Apr 2024 |
| 2 | Alpar Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jul 2011 |
| 3 | Amarillo Exploration, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Apr 2024 |
| 4 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 5 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 6 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 7 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 8 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Apr 2024 |
| 9 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 10 | Anadarko Ogc Company | Houston, TX 77251 | Oil & Gas Operator | Dec 1998 |
| 11 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 12 | Anchor Oil Company | Gruver, TX 79040 | Gas Operator | Apr 2024 |
| 13 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 14 | Arapahoe Resources LLC | Oklahoma City, OK 73157-7107 | Oil & Gas Operator | Jan 2024 |
| 15 | Arch Oil & Gas LLC | Dallas, TX 75254 | Oil & Gas Operator | Apr 2024 |
| 16 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 17 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Apr 2024 |
| 18 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 19 | Argent Energy, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 20 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 21 | Aspen Energy Group, Inc. | Santa Ynez, CA 93460 | Oil & Gas Operator | Mar 2015 |
| 22 | Aspen Energy, Inc. | Seguin, TX 78156 | Oil & Gas Operator | Jul 2019 |
| 23 | Athena Energy, Inc. | Gallatin, TN 37066 | Oil & Gas Operator | Apr 2024 |
| 24 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 25 | Avalanche Oil & Gas LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Apr 2024 |
| 26 | Aven Gas & Oil Inc | Oklahoma City, OK 73113-0491 | Oil & Gas Operator | Nov 2021 |
| 27 | Axis Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Apr 2024 |