| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D. A. Stark | Oil Operator | Dec 1990 | |
| 2 | Damson Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Mar 2005 |
| 3 | Daniel B. Robinett | Oil & Gas Operator | Dec 1990 | |
| 4 | Davis Investment LLC | Oil & Gas Operator | Dec 1998 | |
| 5 | Dcor, L.L.C. | Dallas, TX 75225 | Oil & Gas Operator | Sep 2024 |
| 6 | Decalta International Corp | Denver, CO 80202 | Oil & Gas Operator | Mar 2015 |
| 7 | Del Amo Energy Co. | Oil & Gas Operator | Dec 1987 | |
| 8 | Department Of Conservation | Oil Operator | Dec 2005 | |
| 9 | Deuel Pet. Co. Inc. | Oil & Gas Operator | Dec 2005 | |
| 10 | Deuel Petroleum Company Inc. | Oil & Gas Operator | Dec 1999 | |
| 11 | DKM Offshore Energy Inc. | Oil & Gas Operator | Dec 1993 | |
| 12 | Dominguez Energy L.P. | Oil & Gas Operator | Dec 2000 | |
| 13 | Dominguez Properties | Oil & Gas Operator | Dec 1991 | |
| 14 | Douglas W. Baker Trustee | Oil & Gas Operator | Dec 1993 | |
| 15 | Driltrol | Oil & Gas Operator | Dec 1984 |