| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | P. B. Operating Company | | Oil & Gas Operator | Feb 1978 |
| 3 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 4 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 5 | Painter Oil And Gas LTD. | | Oil & Gas Operator | Jun 1986 |
| 6 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 7 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 8 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 9 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 10 | Parker & Parsley Producing L.P. | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 11 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 12 | Pawnee Oil And Gas, Inc. | Richardson, TX 75083 | Oil & Gas Operator | May 2023 |
| 13 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 14 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 15 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 16 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 17 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 18 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 19 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 20 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 21 | Petroglen Company, Inc. | | Oil & Gas Operator | Jul 1990 |
| 22 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 23 | Petroleum Futures-Chapman Oil | | Oil & Gas Operator | Jul 1981 |
| 24 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 25 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 26 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2025 |
| 27 | Petroquest Exploration, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Mar 2008 |
| 28 | Petrus Oil Company., L.P. | | Oil & Gas Operator | Dec 1989 |
| 29 | Petrus Operating Co., Inc. | | Oil & Gas Operator | Dec 1986 |
| 30 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 31 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 32 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 33 | Phoenix Energy, Inc. | Oilmont, MT 59466 | Oil & Gas Operator | May 2025 |
| 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 Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 37 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 38 | Pioneer Production Corp-Huggs | | Oil & Gas Operator | Jun 1986 |
| 39 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 40 | Planet Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 41 | Plano Corp. | | Oil & Gas Operator | Mar 2005 |
| 42 | Playa Oil & Gas, LP | | Oil & Gas Operator | Apr 2009 |
| 43 | Plymouth Resources Group II Inc | | Oil & Gas Operator | May 2007 |
| 44 | Polaris-MRM Production Co. | | Oil Operator | Nov 1985 |
| 45 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 46 | Prairie Producing Company | | Oil & Gas Operator | Dec 1992 |
| 47 | Premience Energy LLC | | Oil & Gas Operator | Dec 2024 |
| 48 | Premience Tepetate LLC | | Oil & Gas Operator | Jul 2014 |
| 49 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 50 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 51 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 52 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 53 | Proton Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |