| 1 | A & R Energy Inc | Pittsburgh, PA 15244 | Oil & Gas Operator | Dec 2013 |
| 2 | A Berry Enterprises LLC | Freeport, OH 43973 | Oil & Gas Operator | Dec 2024 |
| 3 | Ab Resources Oh LLC | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2010 |
| 4 | Aegean Oil & Gas Inc | Brunswick, OH 44212 | Oil & Gas Operator | Dec 1993 |
| 5 | Alliance Petroleum Corporation | Canton, OH 44718-2553-2553 | Oil & Gas Operator | Dec 2019 |
| 6 | Alsid Oil & Gas | Hanoverton,, OH 44423 | Oil & Gas Operator | Dec 2003 |
| 7 | Am-Tek Oil Inc | Spokane, WA 99201 | Oil & Gas Operator | Dec 2023 |
| 8 | American Energy Associates Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2023 |
| 9 | Appalachian Expl Inc | Hartville, OH 44632-550-550 | Oil & Gas Operator | Dec 1992 |
| 10 | Asset Resources Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2010 |
| 11 | Atlas Noble LLC | Fort Worth, TX 76116-5423-5423 | Oil & Gas Operator | Jun 2020 |
| 12 | Atwood Energy Inc | Port Washington, OH 43837-9214-9214 | Oil & Gas Operator | Dec 1993 |
| 13 | Atwood Resources Inc | Houston, TX 72151-89-89 | Oil & Gas Operator | Dec 1993 |
| 14 | Autumn Ridge Enterprises LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2017 |
| 15 | Aw Tipka Oil & Gas Inc | Dover, OH 44622 | Oil & Gas Operator | Dec 2024 |