| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Gastar Exploration USA, Inc. | Oil & Gas Operator | Dec 2015 | |
| 2 | Greene Energy LLC | Pittsburgh, PA 15241-1405 | Gas Operator | Dec 2006 |
| 3 | Greenridge Oil Inc | New Freeport, PA 15352-1560 | Oil & Gas Operator | Dec 2025 |
| 4 | Greylock Conventional, LLC | Charleston, WV 25311 | Oil & Gas Operator | Jun 2026 |
| 5 | Greylock Opco LLC | Charleston, WV 25311 | Oil & Gas Operator | Dec 2025 |
| 6 | Greylock Production LLC | Charleston, WV 25311-1264 | Oil & Gas Operator | Jul 2026 |