| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Daniel Oil Company | Oil & Gas Operator | Jan 1983 | |
| 2 | Davis Petroleum Corp. | Houston, TX 77027 | Oil & Gas Operator | Dec 2025 |
| 3 | Daylight Petroleum LLC | Houston, TX 77052 | Oil & Gas Operator | Dec 2025 |
| 4 | DBL DRLG.&Prod. Services, Inc. | Oil & Gas Operator | Jul 1997 | |
| 5 | Dow Chemical Co. | Oil & Gas Operator | Dec 1997 | |
| 6 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 7 | Dynamic Exploration, Inc. | Oil & Gas Operator | Oct 2003 |