| 1 | Ab Resources Pa LLC | Brecksville, OH 44141-3296 | Oil & Gas Operator | Dec 2011 |
| 2 | Aiello Bros Oil & Gas Inc | Bradford, PA 16701-2925 | Oil & Gas Operator | Dec 2023 |
| 3 | Allegheny Enterprises Inc | Corsica, PA 15829-3833 | Oil & Gas Operator | Dec 2018 |
| 4 | Allshouse Terrence L Jr | Grand Valley, PA 16420-1930 | Oil & Gas Operator | Dec 2023 |
| 5 | Anderson Energy SVC LLC | Clarendon, PA 16313 | Oil & Gas Operator | Dec 2023 |
| 6 | Arg Resources Inc | Kane, PA 16735-6405 | Oil & Gas Operator | Dec 2019 |
| 7 | Armstrong Gas Co LLC | Kittanning, PA 16201-2269 | Oil & Gas Operator | Dec 2018 |
| 8 | Atlas Resources Inc | Coraopolis, PA 15108-0611 | Oil & Gas Operator | Dec 2007 |
| 9 | Atlas Resources LLC | Pittsburgh, PA 15275-1033 | Oil & Gas Operator | Jun 2018 |
| 10 | Autumn Ridge Energy LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2021 |