| 1 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Jan 2024 |
| 2 | Petroleum Property Services, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jan 2024 |
| 3 | Petroleum Technologies, Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Jan 2024 |
| 4 | Phillips Exploration Company L.C. | Andover, KS 67002 | Oil & Gas Operator | Jan 2024 |
| 5 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 6 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Jan 2024 |
| 7 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Jan 2024 |
| 8 | Pioneer Oil Company, Inc. | Vincennes, IN 47501 | Oil & Gas Operator | Jan 2024 |
| 9 | Plains Oil & Gas | | Oil & Gas Operator | Jan 2019 |
| 10 | Plains Oil Compa | | Oil & Gas Operator | Aug 1988 |
| 11 | Platte Valley Oil Co., Inc. | Ralston, NE 68127 | Oil Operator | Dec 2023 |
| 12 | Post Rock Gas, Inc. | Luray, KS 67699 | Oil & Gas Operator | Jun 2003 |
| 13 | Postrock Midcontinent Production LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jan 2024 |
| 14 | Prairie Wolf Operating, LLC | Stilwell, OK 74960 | Oil & Gas Operator | Jan 2024 |
| 15 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 16 | Producers Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2007 |