| 1 | A & B Oil | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 2 | A & G Oil Company, LLC | Barstow, TX 79719 | Oil & Gas Operator | Feb 2012 |
| 3 | A & G Producers, Inc. | Barstow, TX 79719 | Oil & Gas Operator | Oct 2025 |
| 4 | A&M Oil & Gas LLC | Kermit, TX 79745 | Oil & Gas Operator | Oct 2025 |
| 5 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Oct 2025 |
| 6 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 7 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Oct 2025 |
| 8 | Aghorn Operating, Inc. | Odessa, TX 79768 | Oil & Gas Operator | Oct 2025 |
| 9 | Aj'S Pump Truck Service, Inc. | Odessa, TX 79760 | Oil & Gas Operator | Oct 2025 |
| 10 | Alleder Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 11 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 12 | Altura Energy LTD. | Houston, TX 77210 | Oil & Gas Operator | Apr 2000 |
| 13 | Amcon Resources, Inc. | Oklahoma City, OK 73101 | Gas Operator | Jun 2016 |
| 14 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 15 | Ameredev Operating, LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 16 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 17 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 18 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 19 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Oct 2025 |
| 20 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jul 2025 |
| 21 | Angle Oil Company | Hays, KS 67601 | Oil Operator | Sep 2002 |
| 22 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 23 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 24 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Oct 2025 |
| 25 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 26 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 27 | Arete Creek Operating, LLC | Midland, TX 79703 | Oil & Gas Operator | Oct 2025 |
| 28 | Argee Oil Company | Midland, TX 79702 | Gas Operator | May 1994 |
| 29 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Oct 2025 |
| 30 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 31 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 32 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 33 | Arrington,David H. Oil & Gas,Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |