| 1 | East Resources MGMT LLC | | Oil & Gas Operator | Dec 2010 |
| 2 | East Resources, Inc. | Parkersburg, WV 26101-5519 | Oil & Gas Operator | Dec 2021 |
| 3 | Eastern Gas Trans & Storage Inc | Bridgeport, WV 26330-6919 | Oil & Gas Operator | Dec 2025 |
| 4 | Emax Oil Company | Charlottesville, VA 22903-4973 | Oil & Gas Operator | Dec 2016 |
| 5 | Energy Corp Of Amer | | Oil & Gas Operator | Mar 2018 |
| 6 | Energy Production Co | Pittsburgh, PA 15241-3949 | Oil & Gas Operator | Dec 1994 |
| 7 | Enervest Opr LLC | | Oil & Gas Operator | Dec 2019 |
| 8 | EOG Resources Inc | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 9 | Eqt Chap, LLC | Canonsburg, PA 15317-1000 | Oil & Gas Operator | Apr 2026 |
| 10 | Eqt Production Company | Pittsburg, PA 15222 | Oil & Gas Operator | Apr 2026 |
| 11 | Equitable Prod Eastern States Exploration Inc | Snow Shoe, PA 16874-0178 | Gas Operator | Dec 2001 |
| 12 | Equitable Resources Energy Company | Big Stone Gap, VA 24219 | Oil & Gas Operator | Dec 1997 |
| 13 | Equitrans Inc | Cannonsburg, PA 15317 | Oil & Gas Operator | Dec 2018 |
| 14 | Equitrans, L. P. | Canonsburg, PA 15317 | Oil & Gas Operator | Jul 2021 |
| 15 | Exco Resources (Pa), LLC | Montoursville, PA 17754-2235 | Oil & Gas Operator | Apr 2026 |
| 16 | Exco Resources Pa Inc | Warrendale, PA 15086-6501 | Oil & Gas Operator | Dec 2011 |
| 17 | Exotic Oil & Gas LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2025 |