| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | P D Parker | | Oil & Gas Operator | Aug 1985 |
| 3 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 5 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 6 | Panther Bayou Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2021 |
| 7 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 8 | Paul M. Toce | | Oil & Gas Operator | Jul 1984 |
| 9 | Peak Operating Co. | | Oil & Gas Operator | Jul 2024 |
| 10 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 11 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 12 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 13 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 14 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 15 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 16 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 17 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 18 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 19 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 20 | Petro Ventures Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2019 |
| 21 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 22 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 23 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 24 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 25 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 26 | Petroleum Engineers, Inc. | | Oil & Gas Operator | Jun 1983 |
| 27 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 28 | Petroleum Properties MGMT Corp | | Oil & Gas Operator | Aug 1990 |
| 29 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 30 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2025 |
| 31 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 32 | Pharaoh Oil & Gas, Inc. | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 33 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 34 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 35 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 36 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 37 | Pioneer Exploration Company | Houston, TX 77090 | Oil & Gas Operator | Jul 2025 |
| 38 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Aug 2025 |
| 39 | Pioneer Exploration, LTD. | Houston, TX 77090 | Oil & Gas Operator | Sep 2008 |
| 40 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 41 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 42 | Plano Corp. | | Oil & Gas Operator | Mar 2005 |
| 43 | Pledger West Broussard Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 44 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 45 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 46 | Power Reserves, Inc. | | Oil Operator | Feb 1999 |
| 47 | Prayer Oil & Gas Production, LLC | Hallsville, TX 75650 | Oil & Gas Operator | Oct 2025 |
| 48 | Precision Holdings, LLC | | Oil & Gas Operator | Dec 2015 |
| 49 | Presidio Energy, Inc. | | Oil & Gas Operator | Jan 1992 |
| 50 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 51 | Proton Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |