| 1 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 2 | TDC Engineering, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 3 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Oct 2025 |
| 4 | Texas Energy Sources, Inc. | Midland, TX 79708 | Oil & Gas Operator | Mar 2008 |
| 5 | Texland Petroleum Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2003 |
| 6 | Texland Petroleum, L.P. | Fort Worth, TX 76107 | Oil & Gas Operator | Oct 2025 |
| 7 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 8 | Texon Oil Company, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2023 |
| 9 | Thomas Resources Corporation | Monahans, TX 79756 | Oil Operator | Mar 2008 |
| 10 | Threeway Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 11 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 12 | Tonto Petroleum Corporation | Post, TX 79356 | Oil & Gas Operator | Jan 2007 |
| 13 | Topat Oil Corporation | Midland, TX 79701 | Oil & Gas Operator | Sep 2017 |
| 14 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Oct 2025 |