| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & W Oil & Gas Co. | Gas Operator | Jan 1990 | |
| 2 | D. J. Simmons & Co. Of La. | Gas Operator | Nov 1996 | |
| 3 | Dalen Resources Oil & Gas Co. | Dallas, TX 75206 | Oil & Gas Operator | Jun 2010 |
| 4 | Dalton J. Woods | Oil & Gas Operator | Dec 1985 | |
| 5 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 6 | David L. Whittington | Gas Operator | Dec 1998 | |
| 7 | David L. Whittington Inc | Gas Operator | Sep 2022 | |
| 8 | DCP Midstream, LLC | Oil Operator | Jun 2016 | |
| 9 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 10 | Diablo Oil Corp. | Oil & Gas Operator | Apr 1989 | |
| 11 | Donny Joe Barnhill | Gas Operator | Jun 2024 | |
| 12 | Drake Energy Corporation | Gas Operator | Jun 2024 | |
| 13 | Drum Energy, L.L.C. | Gas Operator | Dec 2016 | |
| 14 | Duke Energy Field Services LLC | Oil Operator | Dec 2006 |