| 1 | A.O.E. Operators, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Mar 2025 |
| 2 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 3 | Accidie Exploration And Dev.,Inc | Plano, TX 75023 | Oil & Gas Operator | Mar 2025 |
| 4 | Ace Productions | Beaumont, TX 77707 | Oil & Gas Operator | Mar 2025 |
| 5 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 6 | Acock Operating Limited | San Antonio, TX 78270 | Oil & Gas Operator | Mar 2025 |
| 7 | Acock/Anaqua Operating Co., LC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Apr 2004 |
| 8 | Acock/Anaqua Operating Co., LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 9 | Aikman Oil Corp. | Oklahoma City, OK 73157 | Oil & Gas Operator | Mar 2025 |
| 10 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 11 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 12 | Alta Mesa Services, LP | Houston, TX 77084 | Oil & Gas Operator | Mar 2025 |
| 13 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 14 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Mar 2025 |
| 15 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 16 | Amerada Hess Corporation | Houston, TX 77252 | Oil & Gas Operator | Aug 2013 |
| 17 | American Coastal Energy, Inc. | Houston, TX 77225 | Oil & Gas Operator | May 2008 |
| 18 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 19 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 20 | Americo Energy Resources, LLC | Houston, TX 77063 | Oil & Gas Operator | Mar 2025 |
| 21 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 22 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | Mar 2025 |
| 23 | Antara Resources Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 24 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 25 | Apb Oil Corporation | Houston, TX 77052 | Oil & Gas Operator | Apr 1996 |
| 26 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 27 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 28 | Aspect Energy, LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2025 |
| 29 | Aspect Resources LLC | Denver, CO 80202 | Oil & Gas Operator | May 2002 |
| 30 | Azimuth Energy, LLC | Denver, CO 80203 | Oil & Gas Operator | Sep 2006 |