| 1 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 2 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 3 | Paragon Resources, Inc | | Oil & Gas Operator | Nov 1991 |
| 4 | Penton And Penton | | Oil & Gas Operator | Jan 1983 |
| 5 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 6 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 7 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 8 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 9 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 10 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 11 | Petroleum Futures-Chapman Oil | | Oil & Gas Operator | Jul 1981 |
| 12 | Petromark Resources Company | Tulsa, OK 74136 | Oil & Gas Operator | Sep 1993 |
| 13 | Phillip A Guzzino | | Oil Operator | Jan 2000 |
| 14 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 15 | Pie La Operating, LLC | | Oil & Gas Operator | Jan 2025 |
| 16 | Pierce Production Company | Eunice, NM 88231 | Oil & Gas Operator | Oct 2012 |
| 17 | Pilot Resources, Inc. | | Oil & Gas Operator | May 2013 |
| 18 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 19 | Pintail Oil & Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 20 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 21 | Pittencrieff America, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 22 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 23 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 24 | Prairie Producing Company | | Oil & Gas Operator | Dec 1992 |
| 25 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 26 | Prudential Oil & Gas, Inc. | | Oil & Gas Operator | Jul 1987 |
| 27 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Jul 2025 |