| 1 | Tana Oil And Gas Corporation | Irving, TX 75062 | Oil & Gas Operator | Mar 2000 |
| 2 | Teal Energy USA, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 3 | Tecpetrol Operating LLC | Houston, TX 77027 | Oil & Gas Operator | Dec 2015 |
| 4 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 5 | Tesoro E&P Company, L.P. | San Antonio, TX 78216 | Oil & Gas Operator | Jan 2000 |
| 6 | Texaco E & P Inc | Houston, TX 77099 | Oil & Gas Operator | Dec 2024 |
| 7 | Texakoma E & P, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2024 |
| 8 | Texas Fuel Company | Galveston, TX 77550 | Oil & Gas Operator | Dec 2024 |
| 9 | Texas Independent Explor LTD. | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 10 | Texas Independent Explor., Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2002 |
| 11 | Texas Western Energy Corporation | Portland, TX 78374 | Oil & Gas Operator | Nov 2002 |
| 12 | The Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 13 | Thorp Petroleum Corporation | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 14 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 15 | Total E&P USA, Inc. | Houston, TX 77210 | Oil & Gas Operator | Nov 2011 |
| 16 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 17 | Touchstone Resources USA, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2006 |
| 18 | Tracker Oil & Gas, Inc. | Bastrop, TX 78602 | Oil & Gas Operator | Dec 2024 |
| 19 | Transtexas Gas Corporation | Houston, TX 77265 | Oil & Gas Operator | Aug 2005 |
| 20 | Trek Oil & Gas, Inc | Houston, TX 77002 | Oil Operator | Mar 1998 |
| 21 | Tri-C Resources, Inc. | Houston, TX 77024 | Oil & Gas Operator | Aug 2009 |
| 22 | Tri-C Resources, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 23 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 24 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 25 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2024 |
| 26 | TX Petroleum Company | Corpus Chrsti, TX 78412 | Oil & Gas Operator | Apr 1996 |