| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D. A. Biglane Operating Co Et Al | Oil Operator | Feb 2004 | |
| 2 | Dale Exploration Co. | Oil & Gas Operator | May 2004 | |
| 3 | David New Operating Co. Inc. | Oil & Gas Operator | Feb 1999 | |
| 4 | David New Operating-Belle Exp | Oil Operator | Mar 1990 | |
| 5 | Day Dreams Resources, LLC | Oil & Gas Operator | Sep 2025 | |
| 6 | Delta Petroleum Inc | Houston, TX 77269-1007 | Oil & Gas Operator | May 2009 |
| 7 | Denbury Onshore, LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 8 | Diamondhead Oil Co., LLC | Oil & Gas Operator | Sep 2025 | |
| 9 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 10 | Domestic Oil Producers | Oil Operator | Oct 1980 | |
| 11 | Domestic Oil Production | Oil & Gas Operator | Oct 1989 | |
| 12 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 13 | Duncan-Taylor & Schumacher | Oil & Gas Operator | Nov 1987 | |
| 14 | Durango Operating LLC | Madison, MS 39110 | Oil & Gas Operator | Sep 2025 |