| 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, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 4 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 5 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 6 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 7 | Paul M. Toce | | Oil & Gas Operator | Jul 1984 |
| 8 | Pedernales Production, LP | Houston, TX 77057 | Oil & Gas Operator | Mar 2022 |
| 9 | Pelto Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 10 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 11 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 12 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 13 | Permeator Corp. | | Oil Operator | Sep 1990 |
| 14 | Peterman-Sturlese Et Al | | Oil & Gas Operator | Sep 1987 |
| 15 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 16 | Petro-Assets Corporation | | Oil & Gas Operator | Feb 2000 |
| 17 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 18 | Petrocana,Inc. | | Oil & Gas Operator | Aug 1993 |
| 19 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 20 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 21 | Petrotex Engineering Company | Cypress, TX 77429 | Oil & Gas Operator | Oct 2025 |
| 22 | Petrotex Louisiana Company | | Oil & Gas Operator | Aug 1998 |
| 23 | Petrus Oil Company., L.P. | | Oil & Gas Operator | Dec 1989 |
| 24 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 25 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 26 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 27 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 28 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 29 | Pintail Oil & Gas, LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2019 |
| 30 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Aug 2025 |
| 31 | Plumb Operating Company, Inc. | | Oil & Gas Operator | Dec 1989 |
| 32 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 33 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 34 | Prairie Producing Company | | Oil & Gas Operator | Dec 1992 |
| 35 | Precision Holdings, LLC | | Oil & Gas Operator | Dec 2015 |
| 36 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 37 | Prudential Oil & Gas, Inc. | | Oil & Gas Operator | Jul 1987 |