| 1 | Eastern Petroleum Company | Girard, OH 44420 | Oil & Gas Operator | Sep 1995 |
| 2 | Eastern States Oil & Gas, Inc. | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2020 |
| 3 | Eclipse Resources-Ohio LLC | Morgantown, WV 26508 | Oil & Gas Operator | Dec 2020 |
| 4 | Energy Exploration & Development | Cortland, OH 44410 | Oil & Gas Operator | Dec 2024 |
| 5 | Energy Resources Of America Inc | North Jackson, OH 44451 | Oil & Gas Operator | Dec 2022 |
| 6 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Apr 2026 |
| 7 | Environmental Exp Co | North Canton, OH 44720 | Oil & Gas Operator | Dec 1998 |
| 8 | Environmental Oil Co | Thornville, OH 43076 | Oil & Gas Operator | Dec 2024 |
| 9 | EOG Ohio, LLC | New Albany, OH 43054-2646 | Oil & Gas Operator | Dec 2025 |
| 10 | Equitable Production Company | Charleston, WV 25302 | Oil & Gas Operator | Dec 2007 |
| 11 | Equity Oil & Gas Funds Inc | Orlando, FL 32837-6103 | Oil & Gas Operator | Dec 2025 |
| 12 | Eric Petroleum Corp | Austintown, OH 44515-1053 | Oil & Gas Operator | Dec 2025 |
| 13 | Everflow Eastern Partners LP | Canfield, OH 44406 | Oil & Gas Operator | Dec 2025 |
| 14 | Exco - North Coast Energy Inc | Kittanning, PA 16201 | Oil & Gas Operator | Dec 2018 |
| 15 | Exploration Energy Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2009 |