| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Dannic Energy Corp | Indiana, PA 15701-1532 | Oil & Gas Operator | Dec 2025 |
| 2 | Deitz Edith | Clarion, PA 16214-9416 | Oil & Gas Operator | Dec 2009 |
| 3 | Deitz Gas & Oil Inc | Clarion, PA 16214-3215 | Oil & Gas Operator | Dec 2024 |
| 4 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Apr 2026 |
| 5 | DL Resources Inc | Oil & Gas Operator | Dec 2025 | |
| 6 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |