| 1 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Dec 2025 |
| 2 | Talos Gulf Coast Onshore LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 3 | Tap Operating Company, Inc. | Mexia, TX 76667 | Oil & Gas Operator | May 1995 |
| 4 | Tartan Resources Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 1995 |
| 5 | Taylor & Associates, Inc. | Houston, TX 77063 | Oil & Gas Operator | Dec 2025 |
| 6 | Taylor-McIlhenny Oper. Co., Inc. | Lewisville, TX 75029 | Oil & Gas Operator | Jan 1996 |
| 7 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Dec 2025 |
| 8 | Te-Ray Resources, Inc. | Oklahoma City, OK 73108 | Oil & Gas Operator | Mar 2015 |
| 9 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Dec 2025 |
| 10 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 11 | Templeton Oil, Inc. | Houston, TX 77002 | Oil & Gas Operator | Nov 1994 |
| 12 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 13 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 14 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Dec 2025 |
| 15 | Texakota, Inc. | Houston, TX 77098 | Oil & Gas Operator | Mar 2021 |
| 16 | Texana Operating Company | Houston, TX 77090 | Oil & Gas Operator | Dec 2025 |
| 17 | Texas American Resources Company | Austin, TX 78701 | Oil & Gas Operator | Dec 2025 |
| 18 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2025 |
| 19 | Texas Land & Trading Co, Inc. | Austin, TX 78734 | Oil & Gas Operator | Mar 2008 |
| 20 | Texas Oil Company, The | Houston, TX 77018 | Oil & Gas Operator | Aug 2006 |
| 21 | Texas, Les & Co. | Brenham, TX 77833 | Oil & Gas Operator | Dec 2025 |
| 22 | Texcal Energy (GP) LLC | Denver, CO 80202 | Oil & Gas Operator | Mar 2016 |
| 23 | Texian Operating Company, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 24 | Thornberry Oilfield Service, Inc | Conroe, TX 77302 | Oil & Gas Operator | Aug 2003 |
| 25 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 26 | Titus Liberty Multi Well 2, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2025 |
| 27 | Tomlinson, Thomas K. Inc. | Port Lavaca, TX 77979 | Oil & Gas Operator | Jul 2003 |
| 28 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 29 | Torrent Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 30 | Transoil, Inc. | Oklahoma City, OK 73129 | Oil & Gas Operator | Dec 2025 |
| 31 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 32 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 33 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 34 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 35 | Trinity River Operating Company | Oklahoma City, OK 73147 | Oil & Gas Operator | Dec 2025 |