| 1 | Padgett Oil Inc. | Sedan, KS 67361 | Oil Operator | May 2006 |
| 2 | Par, Inc. | Oklahoma City, OK 73111 | Oil Operator | May 2016 |
| 3 | Patteson Oil | | Oil Operator | Dec 2009 |
| 4 | Patteson Oil, A General Partnership | Moline, KS 67353 | Oil Operator | Jan 2025 |
| 5 | Patteson, Thomas Wade | Moline, KS 67353 | Oil Operator | Mar 2025 |
| 6 | Patteson-Sheel O | | Oil Operator | Oct 1990 |
| 7 | Peak Energy LLC | Coffeyville, KS 67337 | Oil & Gas Operator | Mar 2025 |
| 8 | Perkins Oil Comp | | Oil Operator | Nov 1988 |
| 9 | Perkins Oil Enterprises, Inc. | Howard, KS 67349 | Oil & Gas Operator | Mar 2025 |
| 10 | Petroleum Enterp | | Oil & Gas Operator | Sep 1995 |
| 11 | Petroleum Enterprises, Inc. | Hutchinson, KS 67504 | Oil & Gas Operator | May 2001 |
| 12 | Petroleum Explor | | Oil Operator | Aug 1983 |
| 13 | Phillips Explora | | Oil & Gas Operator | Dec 1996 |
| 14 | Phillips Oil Properties Inc. | Derby, KS 67037 | Oil Operator | Mar 2025 |
| 15 | Pipeline Oil & Gas, LLC | Phoenix, AZ 85016 | Oil Operator | Feb 2014 |
| 16 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2025 |
| 17 | Powell, Wayne D. & Barbara | Sedan, KS 67361 | Oil Operator | Sep 1996 |
| 18 | Prairie Methane Gas Producers LLC | Dewey, OK 74029 | Oil Operator | Dec 2009 |
| 19 | Production Team | | Oil & Gas Operator | Sep 1991 |
| 20 | Pure Energy Prod | | Oil Operator | Sep 1992 |