| 1 | Aardolie Oil Company | Dallas, TX 75370 | Oil & Gas Operator | Jul 2003 |
| 2 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 3 | Abernathy Auto, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 2024 |
| 4 | Acoma Oil Corporation | Saint Paul, MN 55102 | Oil & Gas Operator | Nov 2024 |
| 5 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 6 | Aec Oil & Gas USA Inc | Denver, CO 80202 | Oil & Gas Operator | May 2004 |
| 7 | Aeternum Energy, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Nov 2024 |
| 8 | Aethon Energy Operating LLC | Dallas, TX 75251 | Oil & Gas Operator | Nov 2024 |
| 9 | Aggietech Oil, LTD. | Midland, TX 79701 | Oil & Gas Operator | Aug 2016 |
| 10 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 11 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 12 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 13 | Allison/Hobbs Inc. | Alba, TX 75410 | Oil & Gas Operator | Nov 2024 |
| 14 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 15 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 16 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 17 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 18 | American Star Energy & Min. Corp | Katy, TX 77449 | Oil & Gas Operator | Nov 2024 |
| 19 | American West Resources, Inc | Fort Worth, TX 76161 | Oil & Gas Operator | Nov 2024 |
| 20 | Americo Oil Company | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2012 |
| 21 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Sep 2024 |
| 22 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 23 | Antero Resources I, LP | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 24 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 25 | Antle, E. | Graham, TX 76450 | Oil & Gas Operator | Oct 1994 |
| 26 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 27 | Apex Operating & Equip. Co. | Bowie, TX 76230 | Oil & Gas Operator | Nov 2003 |
| 28 | Argali Resources | Dallas, TX 75206 | Oil & Gas Operator | Apr 2003 |
| 29 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Nov 2024 |
| 30 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Nov 2024 |
| 31 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Nov 2024 |
| 32 | Aruba Petroleum, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Aug 2024 |
| 33 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 34 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Nov 2024 |
| 35 | Atapco | Houston, TX 77040 | Oil & Gas Operator | Feb 1999 |
| 36 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 37 | Atlas Operating LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2024 |
| 38 | Azteca Petroleum, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Nov 2024 |