| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Dakota Oil & Gas Co | Delmont, PA 15626-2408 | Oil & Gas Operator | Dec 2025 |
| 2 | Delta Petro Corp Of Colorado | Houston, TX 77010-3089 | Gas Operator | Dec 2003 |
| 3 | Diversified Oil & Gas LLC | Jackson Center, PA 16133 | Oil & Gas Operator | Mar 2026 |
| 4 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | May 2026 |
| 5 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 6 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 7 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2024 |
| 8 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 9 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |