| 1 | T-M Well Service | Jefferson, TX 75657 | Oil & Gas Operator | Sep 2004 |
| 2 | T-M Well Service, L.L.C. | Jefferson, TX 75657 | Oil & Gas Operator | Jul 2024 |
| 3 | T. And M. Production | Oil City, LA 71061 | Oil & Gas Operator | Dec 2024 |
| 4 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 5 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 6 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 7 | Texxol Operating Company, Inc. | Fort Worth, TX 76108 | Oil & Gas Operator | Dec 2024 |
| 8 | Three Sisters Petroleum, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Jul 2024 |
| 9 | Thunderbird (Texas) Resources LP | Edmond, OK 73025 | Oil & Gas Operator | Apr 2019 |
| 10 | Tidemark Exploration Inc | Tulsa, OK 74120 | Oil & Gas Operator | Apr 2019 |
| 11 | Torrent Oil LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 12 | Tracer Energy, Inc. | Graham, TX 76450 | Oil & Gas Operator | Nov 1998 |
| 13 | Tracy Production | Lindale, TX 75771 | Oil & Gas Operator | Dec 2024 |
| 14 | Trek Resources, Inc. | Dallas, TX 75207 | Oil & Gas Operator | Dec 2024 |
| 15 | Tri-State Sales & Production | Rodessa, LA 71069 | Oil & Gas Operator | Dec 2008 |
| 16 | Tri-Union Development Corp. | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |