| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | P.M. Petroleum | | Oil Operator | Mar 1998 |
| 3 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 4 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 5 | Paxton Petroleum, LTD. | | Oil & Gas Operator | May 1989 |
| 6 | Pengo Producing Company | | Oil & Gas Operator | Mar 1987 |
| 7 | Pennington Oil & Gas Int, LLC | | Oil & Gas Operator | Dec 2024 |
| 8 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 9 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 10 | Petrominerals Corp. | | Oil & Gas Operator | Dec 2003 |
| 11 | Phoenix Operating Co. Of Texas | | Oil Operator | Jul 1995 |
| 12 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 13 | Plymouth Resources Group II Inc | | Oil & Gas Operator | May 2007 |
| 14 | Pointe Coupee Energy, Inc | | Oil Operator | Dec 2013 |
| 15 | Port Hudson Operating Company | | Oil & Gas Operator | Nov 2024 |
| 16 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 17 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 18 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |