| 201 | Swepi LP | Houston, TX 77079 | Oil & Gas Operator | Jul 2020 |
| 202 | T & F Exploration, LP | Pittsburgh, PA 15241-1375 | Oil & Gas Operator | Oct 2024 |
| 203 | T & T Compression Inc | Clymer, PA 15728-1014 | Gas Operator | Dec 2024 |
| 204 | Tag Enterprises Inc | Shelocta, PA 15774-0310 | Gas Operator | Dec 2016 |
| 205 | Target Energy Inc | Indiana, PA 15701-1135 | Oil & Gas Operator | Dec 2013 |
| 206 | Texas Keystone Inc | Oakmont, PA 15139-2072 | Oil & Gas Operator | Nov 2017 |
| 207 | The Gas & Oil Company LLC | Apollo, PA 15613 | Oil & Gas Operator | Dec 2024 |
| 208 | Timberline Energy Inc | Franklin, PA 16323-0269 | Oil & Gas Operator | Dec 2023 |
| 209 | Turm Oil Inc | Butler, PA 16002-0471 | Oil & Gas Operator | Dec 2022 |
| 210 | TW Phillips Gas Supply Corp | Butler, PA 16001-4904 | Oil & Gas Operator | Dec 2011 |
| 211 | Us Energy Exploration Corp | Rural Valley, PA 16249 | Oil & Gas Operator | Dec 2024 |
| 212 | Us Gypsum Co | Oakfield, NY 14125-9722 | Gas Operator | Dec 2005 |
| 213 | Vec Energy LLC | Kittanning, PA 16201-5022 | Oil & Gas Operator | Jan 2025 |
| 214 | Vernard L Shumaker | Apollo, PA 15613-0249 | Gas Operator | Dec 2024 |
| 215 | Victory Energy Corp | Indiana, PA 15701-8944 | Oil & Gas Operator | Dec 2021 |
| 216 | Wagner & Wagner | Indiana, PA 15701-1273 | Gas Operator | Dec 2012 |
| 217 | WGM Gas Co Inc | Creekside, PA 15732-8500 | Oil & Gas Operator | Dec 2024 |
| 218 | WHC Oper LLC | Commodore, PA 15729-9109 | Gas Operator | Dec 2023 |
| 219 | White Oak Farms Inc | Dayton, PA 16222-4325 | Gas Operator | Dec 2023 |
| 220 | William McIntire Coal Oil & Gas | Shelocta, PA 15774-0171 | Oil & Gas Operator | May 2022 |
| 221 | Wilmoth Interests, Inc. | Marion Center, PA 15759 | Oil & Gas Operator | Dec 2024 |
| 222 | Winfall Energy Inc N V | Vandergrift, PA 15690-2001 | Oil & Gas Operator | Dec 2019 |
| 223 | Wood Drilling LLC | Kittanning, PA 16201 | Gas Operator | Dec 2024 |
| 224 | Wood William C | Kittanning, PA 16201-4328 | Oil & Gas Operator | Dec 2018 |
| 225 | XTO Energy Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |