| 1 | T2 Operating Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 2 | Tactical Oil & Gas, LLC | Odessa, TX 79768 | Oil & Gas Operator | Feb 2026 |
| 3 | Talis Energy Inc. | Austin, TX 78731 | Oil Operator | Feb 2026 |
| 4 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 5 | Tandem Energy Corporation | Houston, TX 77056 | Oil & Gas Operator | Feb 2026 |
| 6 | Targa Midstream Services LLC | Houston, TX 77002 | Oil Operator | Mar 2023 |
| 7 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Feb 2026 |
| 8 | Tema Oil And Gas Company | Houston, TX 77084 | Oil & Gas Operator | Feb 2026 |
| 9 | Tema Oil And Gas, LLC | Houston, TX 77040 | Oil & Gas Operator | Apr 2000 |
| 10 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 11 | Texland-Rector & Schumacher | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2000 |
| 12 | Texstar Operating Inc. | Slaton, TX 79364 | Oil & Gas Operator | Feb 2026 |
| 13 | Tgo Operating, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2008 |
| 14 | Three Span Oil & Gas, Inc. | Midland, TX 79710 | Oil & Gas Operator | Feb 2026 |
| 15 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 16 | Totalfinaelf E&P USA Inc | Houston, TX 77024 | Oil & Gas Operator | Jul 2007 |
| 17 | Trinity Bay Oil & Gas, Inc. | Lubbock, TX 79416 | Oil & Gas Operator | Feb 2026 |
| 18 | Trinity Eor, LLC | Midland, TX 79701 | Oil & Gas Operator | Jan 2019 |
| 19 | Turrentine Oil & Gas, Inc. | Horseshoe Bay, TX 78657 | Oil & Gas Operator | Oct 2019 |
| 20 | Turrentine Oil And Gas | Levelland, TX 79336 | Oil & Gas Operator | Feb 1996 |