| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D & V Petroleum Corporation | Oil & Gas Operator | May 1992 | |
| 2 | D&S Oil & Gas Operators, Inc. | Oil & Gas Operator | Dec 2020 | |
| 3 | D90 Energy, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 4 | Davis Oil Company | Denver, CO 80202 | Oil & Gas Operator | Jun 1988 |
| 5 | DCP Midstream, LLC | Oil Operator | Jun 2016 | |
| 6 | Delhi Gas Pipeline Corporation | Palestine, TX 75802 | Oil & Gas Operator | Feb 1998 |
| 7 | Diversified Production LLC | Keithville, LA 71047 | Oil & Gas Operator | Oct 2025 |
| 8 | DR. Richard C. Baker | Oil & Gas Operator | Sep 2009 | |
| 9 | Duke Energy Field Services Inc | Oil Operator | Mar 2000 | |
| 10 | Duke Energy Field Services LLC | Oil Operator | Dec 2006 |