| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D-Ram Construction Co., Inc. | Gas Operator | Dec 1990 | |
| 2 | D. J. Simmons & Co. Of La. | Gas Operator | Nov 1996 | |
| 3 | Daleco Resources | Gas Operator | Dec 2000 | |
| 4 | David L. Whittington | Gas Operator | Dec 1998 | |
| 5 | David L. Whittington Inc | Gas Operator | Sep 2022 | |
| 6 | DCP Midstream, LLC | Oil Operator | Jun 2016 | |
| 7 | Delta Oil Corp | Oil & Gas Operator | Dec 2005 | |
| 8 | Drum Energy, L.L.C. | Gas Operator | Dec 2016 | |
| 9 | Duke Energy Field Services LLC | Oil Operator | Dec 2006 |