| 1 | A J A Companies | Tyler, TX 75703 | Oil Operator | May 2024 |
| 2 | Abel, M.D. Co. | Lampasas, TX 76550 | Oil & Gas Operator | Jun 2017 |
| 3 | Ableready, Inc. | Houston, TX 77269 | Oil & Gas Operator | May 2024 |
| 4 | Ac Exploration, LLC | Houston, TX 77024 | Oil & Gas Operator | May 2024 |
| 5 | Acirema Corporation | Longview, TX 75608 | Oil & Gas Operator | May 2024 |
| 6 | Adamson Exploration Co. | Kilgore, TX 75662 | Oil Operator | May 2024 |
| 7 | Adexco Operating Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 8 | Alegre Energy Operating, LP | San Antonio, TX 78216 | Oil & Gas Operator | Sep 2005 |
| 9 | Alegre Energy, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | May 2024 |
| 10 | Alice-Sidney Oil Co | El Dorado, AR 71730 | Oil & Gas Operator | Feb 1995 |
| 11 | Altair Energy Corp. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1994 |
| 12 | Amax Oil & Gas Inc | Fort Worth, TX 76107 | Oil & Gas Operator | Nov 2014 |
| 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 | American Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2003 |
| 16 | Ames Financial, Inc | Shreveport, LA 71101 | Oil & Gas Operator | Feb 2024 |
| 17 | Amity Oil Co., Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1977 |
| 18 | Amoco Production Co. | Houston, TX 77253 | Oil & Gas Operator | Jun 2015 |
| 19 | Amplify Energy Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2024 |
| 20 | Anadarko E&P Company LP | Houston, TX 77251 | Oil & Gas Operator | Aug 2014 |
| 21 | Anadarko E&P Onshore LLC | Houston, TX 77046 | Oil & Gas Operator | May 2024 |
| 22 | Andrew Alan Exploration, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2017 |
| 23 | Anthony Oil & Gas Co. | Shreveport, LA 71135 | Oil Operator | May 1993 |
| 24 | Apache Corporation | Houston, TX 77056 | Oil & Gas Operator | May 2024 |
| 25 | Arapahoe Resources LLC | Oklahoma City, OK 73157-7107 | Oil & Gas Operator | Jan 2024 |
| 26 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 27 | Archon Resources LLC | Houston, TX 77074 | Oil & Gas Operator | Jan 2015 |
| 28 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 29 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 30 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | May 2024 |
| 31 | Arena Resources LLC | Longview, TX 75608 | Oil & Gas Operator | Feb 2024 |
| 32 | Argent Petroleum Corporation | Center, TX 75935 | Oil & Gas Operator | May 2024 |
| 33 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | May 2024 |
| 34 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 35 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 36 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | May 2024 |
| 37 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 38 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | May 2024 |
| 39 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 40 | Arrow Rock Energy, LLC | Houston, TX 77079 | Oil & Gas Operator | Mar 2018 |
| 41 | Asa Oil & Gas, Inc. | Brady, TX 76825 | Oil & Gas Operator | May 2024 |
| 42 | Ascent Operating, LP | Plano, TX 75093 | Oil & Gas Operator | Aug 2008 |
| 43 | Asher Resources | Boerne, TX 78006 | Oil & Gas Operator | May 2015 |
| 44 | Atasca Resources Inc | Houston, TX 77219 | Oil & Gas Operator | May 2024 |
| 45 | Atlantis Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | May 2024 |
| 46 | Austex Energy, Inc. | Granbury, TX 76048 | Oil & Gas Operator | Apr 1993 |
| 47 | Austin Energy Operations, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | May 2024 |
| 48 | Austin Resources Corporation | Houston, TX 77027 | Oil & Gas Operator | Mar 2008 |
| 49 | Axtel Energy, Inc. | Richardson, TX 75080 | Oil & Gas Operator | May 2024 |