| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | D-Oil Incorporat | Oil Operator | Aug 1990 | |
| 2 | Daniels E L Dril | Oil Operator | Nov 1995 | |
| 3 | Daniels Oil Co. | Oil Operator | Mar 2025 | |
| 4 | Daniels Petroleu | Oil Operator | Jan 1991 | |
| 5 | Davis, Michael G. | Wichita, KS 67212 | Oil & Gas Operator | Jul 1988 |
| 6 | DB Energy, LLC | Baldwin City, KS 66006 | Oil Operator | May 2025 |
| 7 | Denova | Oil Operator | Jan 1989 | |
| 8 | Dorado Gas Resources LLC | Centennial, CO 80112 | Oil & Gas Operator | Jul 2009 |
| 9 | Double 'E' Oil-B | Oil Operator | Mar 1989 | |
| 10 | Drilex Oil & Gas | Oil Operator | Apr 1987 |