| 1 | Pancanadian Petr | | Oil Operator | Aug 1990 |
| 2 | Patterson Energy LLC | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 3 | Paul Bowman Oil Trust | Codell, KS 67663 | Oil Operator | Jun 2025 |
| 4 | Pelican Hill Oil & Gas Inc | Carlsbad, CA 92010 | Oil & Gas Operator | May 2013 |
| 5 | Petro Pak Corpor | | Oil Operator | Aug 1988 |
| 6 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 7 | Petroleum Incorp | | Oil & Gas Operator | Apr 1993 |
| 8 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 9 | Petroleum Prod. MGMT | | Oil Operator | Nov 1995 |
| 10 | Petroleum Produc | | Oil & Gas Operator | Dec 1996 |
| 11 | Petroleum Production Management, Inc. | Shawnee Mission, KS 66202 | Oil & Gas Operator | Nov 2021 |
| 12 | Petroventures In | | Oil Operator | Apr 1987 |
| 13 | Phillips Exploration Company L.C. | Andover, KS 67002 | Oil & Gas Operator | Jun 2025 |
| 14 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 15 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 16 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Jun 2025 |
| 17 | Pioneer Resources | Jefferson, CO 80456 | Oil Operator | Dec 2009 |
| 18 | Pioneer Resources Inc. | Phillipsburg, KS 67661 | Oil & Gas Operator | Oct 2020 |
| 19 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Jun 2025 |
| 20 | Pratt, Don E. | Hays, KS 67601 | Oil Operator | Dec 1999 |
| 21 | Price Robert R O | | Oil Operator | Apr 1995 |
| 22 | Production Drilling, Inc. | Hays, KS 67601 | Oil Operator | Jun 2025 |
| 23 | Prospect Oil & Gas Corp | Russell, KS 67665 | Oil Operator | Jun 2025 |