| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & K Supply Inc | East Canton, OH 44730 | Oil & Gas Operator | Dec 2002 |
| 2 | D&D Energy Company | N.Canton, OH 44721 | Oil & Gas Operator | Dec 2020 |
| 3 | Danny Long & Sons Inc | Magnolia, OH 44643 | Oil & Gas Operator | Dec 2024 |
| 4 | Dart Oil Company | Parker, CO 80134 | Oil & Gas Operator | Dec 2024 |
| 5 | David R Hill Inc | Byesville, OH 43723 | Oil & Gas Operator | Dec 2024 |
| 6 | Derrick Petroleum Inc | Bladensburg, OH 43005 | Oil & Gas Operator | Dec 2025 |
| 7 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2026 |
| 8 | Dorfman Production Company | Beloit, OH 44609 | Oil & Gas Operator | May 2026 |
| 9 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2025 |