| 1 | T. A. W. Company | Kingsbury, TX 78638 | Oil & Gas Operator | Dec 2024 |
| 2 | T. N. T. Energy Co. | Belcher, LA 71004 | Oil Operator | May 1991 |
| 3 | Team Operating, L.L.C. | Pinehurst, TX 77362 | Oil & Gas Operator | Dec 2024 |
| 4 | Tejones Operating Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2024 |
| 5 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 6 | Texas Vanguard Oil Company | Austin, TX 78720 | Oil & Gas Operator | Jan 2014 |
| 7 | Texian Operating Company, LLC | Irving, TX 75063 | Oil & Gas Operator | Dec 2024 |
| 8 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 9 | Texstar Oil & Gas, LLC | Luling, TX 78648 | Oil & Gas Operator | Dec 2024 |
| 10 | Thomas Oil & Gas Company | Luling, TX 78648 | Oil & Gas Operator | Aug 2003 |
| 11 | Tilmon Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Sep 2012 |
| 12 | Titan Exploration LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2024 |
| 13 | Trace Energy Management Inc | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2024 |
| 14 | Tri-County Operating Company | Seguin, TX 78156 | Gas Operator | Feb 1997 |
| 15 | Trinidad Petroleum, Inc. | Austin, TX 78711 | Oil & Gas Operator | Dec 2024 |
| 16 | Triple C Oil Inc. | Lockhart, TX 78644 | Oil Operator | Aug 2019 |
| 17 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Dec 2024 |
| 18 | Truth Resources LP | Houston, TX 77090 | Oil Operator | Sep 2021 |
| 19 | Tuleta Energy Partners, LLC | Norman, OK 73072 | Oil & Gas Operator | Dec 2024 |
| 20 | Tuthill & Barbee | Amarillo, TX 79101 | Oil & Gas Operator | Nov 1994 |
| 21 | TX Lone Star Operating Co, LLC | Sulphur SPGS, TX 75483 | Oil & Gas Operator | Dec 2024 |
| 22 | Txla Energy, Inc. | Houston, TX 77018 | Oil & Gas Operator | Dec 2024 |