| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 3 | Panaco Production Co | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 4 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 5 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 6 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 7 | Pay Oil, L. L. C. | | Oil & Gas Operator | Jan 2025 |
| 8 | Pay Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 9 | Pay Ventures, L.L.C. | | Oil Operator | Dec 2024 |
| 10 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 11 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 12 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 13 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 14 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 15 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 16 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 17 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 18 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 19 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 20 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 21 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 22 | Playa Oil & Gas, LP | | Oil & Gas Operator | Apr 2009 |
| 23 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 24 | Project Design Specialists Inc | | Oil & Gas Operator | May 1991 |