| 1 | Eastern Petroleum Company | Girard, OH 44420 | Oil & Gas Operator | Sep 1995 |
| 2 | Eclipse Resources-Ohio LLC | Morgantown, WV 26508 | Oil & Gas Operator | Dec 2020 |
| 3 | Edco Drilling & Producing | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2006 |
| 4 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2024 |
| 5 | Enterprise Energy Corp | Cambridge, OH 43725 | Oil & Gas Operator | Dec 1985 |
| 6 | Envirogas Inc | Hamburg, NY 14075 | Oil & Gas Operator | Dec 1992 |
| 7 | Environmental BR Ser Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 1987 |
| 8 | Environmental Exp Co | North Canton, OH 44720 | Oil & Gas Operator | Dec 1998 |
| 9 | Environmental Oil Co | Thornville, OH 43076 | Oil & Gas Operator | Dec 2022 |
| 10 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103-6103 | Oil & Gas Operator | Dec 2022 |
| 11 | Everflow Eastern Partners LP | Canfield, OH 44406 | Oil & Gas Operator | Dec 2023 |
| 12 | Excalibur Exploration Inc | Greentown, OH 44630-362-362 | Oil & Gas Operator | Dec 2020 |
| 13 | Exco - North Coast Energy Inc | Kittanning, PA 16201 | Oil & Gas Operator | Dec 2018 |
| 14 | Exploration Energy Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2009 |