| 1 | Aber Oil & Gas Co. | Tyler, TX 75702 | Oil & Gas Operator | Nov 2013 |
| 2 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 3 | Adkins, R. L. Corp. | Lubbock, TX 79408 | Oil & Gas Operator | Jun 2013 |
| 4 | Afe Oil & Gas Consultants | Addison, TX 75001 | Gas Operator | Jan 2003 |
| 5 | Akers & Fultz, Inc. | Graham, TX 76450 | Oil & Gas Operator | Jun 2003 |
| 6 | Akers, B. F. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 7 | Alamosa Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 8 | Albert, David Oil & Gas | Dallas, TX 75240 | Oil & Gas Operator | Mar 2008 |
| 9 | Allar Co., The | Graham, TX 76450 | Oil & Gas Operator | Dec 2004 |
| 10 | Altex Resources, Inc. | Carney, OK 74832 | Oil & Gas Operator | Mar 2015 |
| 11 | Ambrit Energy Corporation | Garland, TX 75044 | Oil & Gas Operator | Jun 2003 |
| 12 | Amen Oil LLC | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 13 | American Exploration Company | Houston, TX 77010 | Oil & Gas Operator | Jan 2000 |
| 14 | Aminex USA, Inc. | Somerset, TX 78069 | Oil & Gas Operator | May 2018 |
| 15 | Anadarko Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Jan 2024 |
| 16 | Anderson, Carl T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Feb 2014 |
| 17 | Anderson, E D | Cisco, TX 76437 | Oil & Gas Operator | Nov 2009 |
| 18 | Anderson, Roger W. Corp. | Clyde, TX 79510 | Oil & Gas Operator | Apr 2020 |
| 19 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Apr 2024 |
| 20 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | Apr 2024 |
| 21 | Apex Operating & Equip. Co. | Bowie, TX 76230 | Oil & Gas Operator | Nov 2003 |
| 22 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 23 | Archer Reef Oil Co. | Bellevue, TX 76228 | Oil & Gas Operator | Apr 2024 |
| 24 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2024 |
| 25 | Argosy | Carrollton, TX 75010 | Oil & Gas Operator | Aug 2003 |
| 26 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |
| 27 | Arledge & Young, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Feb 1999 |
| 28 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2024 |
| 29 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 30 | Arrowhead Productions, LP | Fort Worth, TX 76109 | Oil & Gas Operator | Apr 2024 |
| 31 | Aruba Petroleum Inc | Dallas, TX 75379 | Oil & Gas Operator | Dec 2023 |
| 32 | Aruba Petroleum, LTD. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2003 |
| 33 | Ashtola Exploration Company,Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2024 |
| 34 | Aspect Abundant Shale LP | Denver, CO 80203 | Oil & Gas Operator | Nov 2012 |
| 35 | Aspen Operating Company LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Apr 2024 |
| 36 | Athena Resources, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Apr 2024 |
| 37 | Atlas Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 38 | Atlas Growth Texas, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2019 |
| 39 | Atoka Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Apr 2024 |
| 40 | Augustus Oil And Gas Corporation | Austin, TX 78731 | Oil & Gas Operator | Apr 2024 |
| 41 | Ausanka Oil Operations | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 1995 |
| 42 | Ayres, C. D. | Iowa Park, TX 76367 | Oil & Gas Operator | Apr 2024 |
| 43 | Azteca Petroleum, LLC | Fort Worth, TX 76106 | Oil & Gas Operator | Apr 2024 |