| 1 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 2 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 3 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 4 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 5 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 6 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 7 | Panaco Production Co | Houston, TX 77002 | Oil & Gas Operator | Dec 1999 |
| 8 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2025 |
| 9 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 10 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 11 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 12 | Patrick Petroleum Corp. | | Oil & Gas Operator | Oct 1984 |
| 13 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 14 | Pel-Tex Oil Company, LLC | | Oil & Gas Operator | Nov 2010 |
| 15 | Pelto Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 16 | Pend Oreille Oil & Gas Company | | Oil & Gas Operator | Sep 1989 |
| 17 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 18 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 19 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 20 | Peterman-Sturlese Et Al | | Oil & Gas Operator | Sep 1987 |
| 21 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 22 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 23 | Petrocan, Inc. | | Oil & Gas Operator | Apr 1998 |
| 24 | Petrocorp | | Oil & Gas Operator | Nov 1992 |
| 25 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 26 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 27 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 28 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 29 | Petroleum Capital, L.C. | Dallas, TX 75367 | Oil & Gas Operator | Oct 2025 |
| 30 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 31 | Petroleum Resource MGMT Co TX | | Oil & Gas Operator | Sep 2020 |
| 32 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 33 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 34 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 35 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 36 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Aug 2025 |
| 37 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 38 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 39 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 40 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 41 | Prayer Oil & Gas Production, LLC | Hallsville, TX 75650 | Oil & Gas Operator | Oct 2025 |
| 42 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 43 | Primary Fuels, Inc. | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 44 | Prospective Investment & Trding Co LTD | | Oil & Gas Operator | Sep 2012 |