| 1 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2025 |
| 2 | T.O.F., Inc. | | Oil & Gas Operator | Dec 2002 |
| 3 | Tapo Energy, LLC | West Union, WV 26456 | Oil & Gas Operator | Dec 2021 |
| 4 | Targa Development, Inc. | Clarksburg, WV 26301-0000 | Oil & Gas Operator | Dec 2021 |
| 5 | Tate Gas Company | Glenville, WV 26351-0000 | Oil & Gas Operator | Dec 2021 |
| 6 | Taylor, W H | | Gas Operator | Dec 2004 |
| 7 | Teavee Oil & Gas, Inc. | Charleston, WV 25301-0000 | Oil & Gas Operator | Dec 2021 |
| 8 | Tedik Limited Partnership | Williamson, WV 25661-0000 | Gas Operator | Dec 2021 |
| 9 | Ten A Coal Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2020 |
| 10 | Tender Equity Corporation | Marietta, OH 45750 | Oil & Gas Operator | Dec 2007 |
| 11 | Tenison Oil Company | Abilene, TX 79605 | Oil & Gas Operator | Oct 2025 |
| 12 | Tenmile Land Limited Liability Company | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2021 |
| 13 | Term Energy Corp. | Harrisville, WV 26362-0000 | Oil & Gas Operator | Dec 2021 |
| 14 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 15 | The Calvert Company | Oklahoma City, OK 73154-1589 | Oil & Gas Operator | Dec 2021 |
| 16 | The Glass Development Company | St. Marys, WV 26170-0000 | Oil & Gas Operator | Dec 2021 |
| 17 | Thomas Oil Company | | Oil & Gas Operator | Dec 2008 |
| 18 | Tiger Oil, Inc. | Canal Wincheste, OH 43110 | Oil & Gas Operator | Dec 2007 |
| 19 | TNG, Inc. | | Oil & Gas Operator | Dec 1996 |
| 20 | Toney Branch Gas Company | Huntington, WV 25702-0086 | Gas Operator | Dec 2021 |
| 21 | Tower Drilling Corporation | | Oil & Gas Operator | Dec 2021 |
| 22 | Trans Energy, Inc. | St. Marys, WV 26170 | Oil & Gas Operator | Dec 2017 |
| 23 | Tri-County Oil & Gas, Inc. | Fairmont, WV 26555-0000 | Oil & Gas Operator | Dec 2019 |
| 24 | Triad Energy, Inc. | Oklahoma City, OK 73105-1401 | Oil & Gas Operator | Nov 2025 |
| 25 | Triad Hunter, LLC | Spring, TX 77389 | Oil & Gas Operator | Dec 2021 |
| 26 | Triad Resources Inc | Spring, TX 77389 | Oil & Gas Operator | Dec 2020 |
| 27 | Tribune Resources, LLC | | Oil & Gas Operator | Dec 2021 |
| 28 | Trio Oil And Gas Company | Salem, WV 26426 | Oil & Gas Operator | Nov 2021 |
| 29 | Trio Petroleum Corp. | Glenville, WV 26351-0880 | Oil & Gas Operator | Jul 2016 |
| 30 | Trittipo, J. L. | | Oil & Gas Operator | Nov 1997 |
| 31 | Tucker, Gene | | Oil & Gas Operator | Dec 2011 |
| 32 | Tug Fork Development | Catlettsburg, KY 41129 | Gas Operator | Dec 2021 |
| 33 | Tug Hill Operating, LLC | Fort Worth, TX 76107 | Oil & Gas Operator | Dec 2021 |
| 34 | Tuscany Gas Limited Liability Company | | Gas Operator | Dec 2021 |