| 1 | A. W. Sour, Jr. | | Oil Operator | Mar 2003 |
| 2 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 3 | Akin Beene Resources LLC | | Oil & Gas Operator | May 2016 |
| 4 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Oct 2025 |
| 5 | Alvin & Roger Wilson | | Oil Operator | Dec 2007 |
| 6 | American Explorer, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1999 |
| 7 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 8 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 9 | Andries Oil Company | | Oil Operator | Jan 2025 |
| 10 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 11 | Arbco, Inc. | | Oil & Gas Operator | Jan 1996 |
| 12 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 13 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 14 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 15 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 16 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 17 | Arlis Scogin Et Al | | Oil & Gas Operator | Jan 1990 |
| 18 | Arxana Oil & Gas Company, LLC | | Oil & Gas Operator | Jun 1998 |
| 19 | Ascot Oils, Inc. | | Oil & Gas Operator | Jul 1993 |
| 20 | Associated Natural Gas, Inc. | | Oil Operator | Apr 1996 |
| 21 | Attaway Energy Group, Inc. | | Oil & Gas Operator | Aug 1995 |
| 22 | Autry C. Stephens | Midland, TX 79701 | Oil & Gas Operator | Dec 2001 |
| 23 | Azul Operating, LLC | | Gas Operator | Dec 2024 |