| 1 | Abaco Operating, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2025 |
| 2 | Abraxas Petroleum Corporation | San Antonio, TX 78259 | Oil & Gas Operator | Mar 2025 |
| 3 | Acock Engineering & Assoc., Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jul 2002 |
| 4 | Advantage Oil & Gas, Inc. | Pinehurst, TX 77362 | Oil & Gas Operator | Mar 2025 |
| 5 | Akers, Bill | Hebbronville, TX 78361 | Oil & Gas Operator | Aug 2003 |
| 6 | Alacia Operating Company | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 7 | Alamo Operating Company, L. C. | San Antonio, TX 78278 | Oil & Gas Operator | Aug 2023 |
| 8 | Alco DRLG. Co. | Freer, TX 78357 | Oil & Gas Operator | Mar 2025 |
| 9 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 10 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Mar 2025 |
| 11 | Allen Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jun 2016 |
| 12 | Alliance Resources Corporation | Dallas, TX 75367 | Oil & Gas Operator | Mar 2025 |
| 13 | Alltex Exploration, Inc. | Houston, TX 77056 | Oil & Gas Operator | Mar 2025 |
| 14 | Alta Energy Corporation | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 15 | Alyndson Oil & Gas Inc. | Alice, TX 78333 | Oil & Gas Operator | Jun 2000 |
| 16 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 17 | Amazon Royalties, Inc. | Fulshear, TX 77441 | Oil & Gas Operator | Mar 2025 |
| 18 | Amerac Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2013 |
| 19 | American Energy Partners Inc | Boerne, TX 78006 | Oil & Gas Operator | Dec 2011 |
| 20 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 21 | American Shoreline, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 22 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 23 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2024 |
| 24 | Anaqua Oil & Gas, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2008 |
| 25 | Anderson Oil Corporation | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Nov 1999 |
| 26 | Anderson Oil LTD. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 27 | Anderson Producing, Inc. | Houston, TX 77057 | Oil & Gas Operator | Sep 2013 |
| 28 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Mar 2025 |
| 29 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Mar 2025 |
| 30 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Mar 2025 |
| 31 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 32 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 33 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | Mar 2025 |
| 34 | Argent Energy (Us) Holdings Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2021 |
| 35 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 36 | Arriola Operating & Consltg Inc. | Dallas, TX 75248 | Oil Operator | Mar 2025 |
| 37 | Ascent Energy, Inc | McKinney, TX 75069 | Oil & Gas Operator | Nov 2008 |
| 38 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 39 | Ashland Exploration Inc | Houston, TX 77218 | Oil & Gas Operator | Nov 2000 |
| 40 | Aspen Exploration, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2012 |
| 41 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Mar 2025 |
| 42 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | Mar 2025 |
| 43 | Aurora Resources Corporation | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Mar 2025 |
| 44 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Mar 2025 |
| 45 | Awp Operating Company | George West, TX 78022 | Oil & Gas Operator | Mar 2025 |
| 46 | Axio Production Company, L.P. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2006 |