| 1 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 2 | Penn-Ohio Investment Corp. | New Philadelphi, OH 44663 | Oil & Gas Operator | Dec 2004 |
| 3 | Peroco Oil & Gas | Killbuck, OH 44637 | Oil & Gas Operator | Dec 1987 |
| 4 | Petro Drilling Corp | Columbus, OH 43229 | Oil & Gas Operator | Dec 1993 |
| 5 | Petro Evaluation Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2022 |
| 6 | Petro Quest Inc | Guysville, OH 45735 | Oil & Gas Operator | Dec 2023 |
| 7 | Petrox, Inc | Streetsboro, OH 44241 | Oil & Gas Operator | Dec 2023 |
| 8 | Pettigrew Pumping Service Inc | Ravenna, OH 44266 | Oil & Gas Operator | Dec 2023 |
| 9 | Pin Oak Energy Partners LLC | Akron, OH 44311 | Oil & Gas Operator | Feb 2024 |
| 10 | Pine Top Inc | Akron, OH 44313 | Oil & Gas Operator | Dec 2016 |
| 11 | Ponderosa Consulting Services Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2019 |
| 12 | Power Gas Marketing & Trans | Akron, OH 44311-1057-1057 | Oil & Gas Operator | Dec 2005 |
| 13 | Prime Time Energy Investment Inc | MT Vernon, OH 43050 | Oil & Gas Operator | Dec 2023 |