| 1 | T Investments Inc | Oklahoma City, OK 73118-1401 | Oil & Gas Operator | Mar 2011 |
| 2 | T-Bar-X Limited Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2005 |
| 3 | Tag Operating Company, Inc. | Houston, TX 77092 | Oil & Gas Operator | Feb 2026 |
| 4 | Tahiti PTRS Enrgy Solutions Corp | Long Beach, CA 90807 | Oil Operator | Feb 2026 |
| 5 | Taleeho Energy Co. | Normangee, TX 77871 | Oil & Gas Operator | Jun 2003 |
| 6 | Tamarack Petroleum Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2026 |
| 7 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 8 | TC Oil And Gas, LLC | Denton, TX 76205 | Oil Operator | Feb 2026 |
| 9 | TDT Production, Inc. | Capitola, CA 95010 | Oil & Gas Operator | Aug 2003 |
| 10 | Tech Resources, Inc. | Georgetown, TX 78628 | Oil & Gas Operator | Dec 2001 |
| 11 | Teco Operating Company | Athens, TX 75751 | Oil & Gas Operator | Jun 2001 |
| 12 | Tepee Petroleum Company, Inc. | Houston, TX 77098 | Oil & Gas Operator | Feb 2014 |
| 13 | Texaco E & P Inc. | Houston, TX 77099 | Oil & Gas Operator | Feb 2026 |
| 14 | Texas Royalty Corp. | Austin, TX 78746 | Oil & Gas Operator | Feb 2026 |
| 15 | Texla Operating Co | Jonesville, TX 75659 | Oil & Gas Operator | Feb 2026 |
| 16 | Texlan Oil Company, Inc. | Tyler, TX 75701 | Oil & Gas Operator | Nov 1994 |
| 17 | TGNR Gulf Coast LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 18 | Thomfield Energy LLC | Kilgore, TX 75663 | Oil Operator | Feb 2026 |
| 19 | Threshold Development Company | Fort Worth, TX 76109 | Oil & Gas Operator | Aug 2016 |
| 20 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 21 | Trailblazer Energy Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 22 | Trans-Tex Operating LLC | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 23 | Travis Operating, LLC | Kingwood, TX 77345 | Oil & Gas Operator | Feb 2026 |
| 24 | Treadstone Energy Partners, LLC | Houston, TX 77070 | Oil & Gas Operator | Jun 2016 |
| 25 | Triad Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Oct 2011 |
| 26 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 27 | Tristar Exploration, Inc | Pflugerville, TX 78660 | Oil & Gas Operator | Feb 2026 |
| 28 | Trivium Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Feb 2026 |
| 29 | Tuleta Energy Partners, LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 30 | Tyler Oil & Gas Inc. | Tyler, TX 75702 | Oil & Gas Operator | Sep 2004 |