| 1 | T. W. McGuire & Associates, Inc. | | Oil & Gas Operator | Nov 2018 |
| 2 | Tanos Exploration II, LLC | Tyler, TX 75701 | Oil & Gas Operator | Sep 2023 |
| 3 | TDX Energy, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 4 | Tenneco Oil Company | Oklahoma City, OK 73125 | Oil & Gas Operator | Sep 2025 |
| 5 | Tensas Delta Expl Co., LLC | Shreveport, LA 71101-5323 | Oil & Gas Operator | Jul 2021 |
| 6 | Texas Eastern Transm. Corp. | | Oil & Gas Operator | Dec 2002 |
| 7 | Texas Oil & Gas Corporation | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 8 | Texas Petroleum Investment Company | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 9 | TGNR TVL LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 10 | Tim Brookover | | Oil & Gas Operator | Dec 2005 |
| 11 | TMR Exploration, Inc. | Bossier City, LA 71171 | Oil & Gas Operator | Dec 2025 |
| 12 | Torch Operating Company | Houston, TX 77010 | Oil & Gas Operator | Mar 2015 |
| 13 | Total Minatome Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 1998 |
| 14 | Trinity River Energy Oper, LLC | Houston, TX 77008 | Oil & Gas Operator | May 2018 |
| 15 | Txo Production Corp. | Ganado, TX 77962 | Oil & Gas Operator | Aug 2022 |