| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D D Natural Resources LLC | Oil & Gas Operator | Oct 2025 | |
| 2 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 3 | Daybreak Oil And Gas, Inc. | Oil & Gas Operator | Oct 2025 | |
| 4 | Depco Inc. | Denver, CO 80202 | Oil & Gas Operator | Apr 2014 |
| 5 | Deuel Petroleum Company Inc. | Oil & Gas Operator | Dec 1999 | |
| 6 | Doc Oil Corp. | Oil Operator | Dec 2006 | |
| 7 | Dole Enterprises Inc. | Oil & Gas Operator | Oct 2025 | |
| 8 | Donald Len Barreth | Oil & Gas Operator | Dec 1991 | |
| 9 | Dos Lobos Oil Co. | Oil Operator | Dec 1999 | |
| 10 | Double Barrel Oil Co. | Oil Operator | Dec 1978 | |
| 11 | Drilling & Production Co. | Oil & Gas Operator | Oct 2025 | |
| 12 | Drilling Exploration & Operating Co. Inc. | Oil & Gas Operator | Oct 2025 | |
| 13 | Dwayne'S Engineering | Oil Operator | Sep 2025 |