| 1 | Action Petroleum Inc | Atwater, OH 44201 | Oil & Gas Operator | Dec 1986 |
| 2 | Alliance Petroleum Corporation | Canton, OH 44718-2553-2553 | Oil & Gas Operator | Dec 2019 |
| 3 | Allied Oil Field Services LTD | Willoughby, OH 44094 | Oil & Gas Operator | Dec 2021 |
| 4 | Alsid Oil & Gas | Hanoverton,, OH 44423 | Oil & Gas Operator | Dec 2003 |
| 5 | Altos Petroleum Serv Inc | Bristolville, OH 44402 | Oil & Gas Operator | Dec 1992 |
| 6 | Amer Energy Develop Inc | Columbus, OH 43220 | Oil & Gas Operator | Dec 1989 |
| 7 | American Energy Associates Inc | Cortland, OH 44410 | Oil & Gas Operator | Dec 2022 |
| 8 | Annarock Petroleum LLC | 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 Energy Group Inc | Uniontown, OH 44685-9575-9575 | Oil & Gas Operator | Dec 2011 |
| 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 2023 |