| 1 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 2 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2025 |
| 3 | Tachoir Resources Inc | | Oil & Gas Operator | Dec 2025 |
| 4 | Tag Enterprises Inc | Shelocta, PA 15774-0310 | Gas Operator | Dec 2016 |
| 5 | Tanglewood Expl LLC | Fort Worth, TX 76102-4665 | Gas Operator | Jun 2011 |
| 6 | Target Energy Inc | Indiana, PA 15701-1135 | Oil & Gas Operator | Dec 2013 |
| 7 | Tatonka Oil Co LLC | Columbus, OH 43201-3684 | Oil & Gas Operator | Dec 2025 |
| 8 | Tenaska Res LLC | Canonsburg, PA 15317 | Gas Operator | May 2020 |
| 9 | Ter Ex Inc | Butler, PA 16002-8638 | Gas Operator | Dec 1994 |
| 10 | Terry D Coan | Youngsville, PA 16371-3608 | Oil & Gas Operator | Dec 2021 |
| 11 | Tevebaugh MGMT Co | Baden, PA 15005-0123 | Oil & Gas Operator | Dec 2002 |
| 12 | Texaco Inc | Kingfisher, OK 73750 | Oil & Gas Operator | Dec 2017 |
| 13 | Texakoma Oil & Gas Corp | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 14 | Texakoma Opr LP | Plano, TX 75024-6679 | Oil & Gas Operator | Dec 2012 |
| 15 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 16 | Texas Meridian Operating Co. Inc | Houston, TX 77079 | Oil & Gas Operator | Oct 1993 |
| 17 | The Gas & Oil Company LLC | Apollo, PA 15613 | Oil & Gas Operator | Dec 2025 |
| 18 | The Production Co | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2012 |
| 19 | The Production Co LLC | Ligonier, PA 15658-0467 | Oil & Gas Operator | Dec 2020 |
| 20 | Tilden Marcellus LLC | Houston, TX 77024-1358 | Gas Operator | May 2022 |
| 21 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2025 |
| 22 | Timbuck Resources LLC | Fredericktown, OH 43019-0117 | Oil & Gas Operator | Dec 2005 |
| 23 | Timothy Chambers | Punxsutawney, PA 15767-1821 | Gas Operator | Dec 2025 |
| 24 | Tipco | Shreveport, LA 71104-3047 | Oil & Gas Operator | May 1988 |
| 25 | Titusville Oil & Gas Assoc Inc | Pleasantville, PA 16341-1705 | Oil Operator | Dec 2025 |
| 26 | TNT Oil Co. | Hamlin, TX 79520 | Oil & Gas Operator | Aug 2026 |
| 27 | Tom A Leeper | Brush Valley, PA 15720-0206 | Oil & Gas Operator | Dec 2024 |
| 28 | Transamer Petro Corp | Pittsburgh, PA 15222-3510 | Gas Operator | Dec 1985 |
| 29 | Travis Peak Resources LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2026 |
| 30 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 31 | Triana Energy LLC | Charleston, WV 25301-2815 | Gas Operator | Nov 2018 |
| 32 | Trimont Energy LLC | Pittsburgh, PA 15211-1205 | Oil & Gas Operator | Dec 2016 |
| 33 | Trinity Energy Corp | Gibsonia, PA 15044-9106 | Oil & Gas Operator | Dec 2007 |
| 34 | Trinity Mineral Partners LLC | Pittsburgh, PA 15238-2718 | Oil & Gas Operator | Dec 2025 |
| 35 | Troyer Energies Inc | Waterford, PA 16441-2809 | Gas Operator | Dec 2025 |
| 36 | Troyer Gas & Oil | Waterford, PA 16441-2843 | Gas Operator | Dec 2001 |
| 37 | True Oil LLC | Casper, WY 82602 | Oil & Gas Operator | Jun 2026 |
| 38 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 39 | Turm Oil Inc | | Oil & Gas Operator | Dec 2025 |
| 40 | TW Phillips Gas Supply Corp | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2011 |