| 1 | P. R. L. Oil Company | Albany, TX 76430 | Oil & Gas Operator | Apr 2008 |
| 2 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 3 | Palo Petroleum, Inc. | Dallas, TX 75360 | Oil & Gas Operator | Sep 2026 |
| 4 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 5 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 6 | Park & Park Oil Co. | Allen, TX 75002 | Oil & Gas Operator | Sep 2026 |
| 7 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 8 | Patara Andover I LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2014 |
| 9 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 10 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 11 | Pawnee Oil And Gas, Inc. | Richardson, TX 75083 | Oil & Gas Operator | May 2023 |
| 12 | Peak Energy Corporation | Plano, TX 75093 | Oil & Gas Operator | Oct 2018 |
| 13 | Pearl Petroleum Inc | Lawton, OK 73501-5821 | Oil & Gas Operator | Jan 2014 |
| 14 | Pedernales Petroleum Op, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 15 | Pennant Dev. And Prod., LLC | Midland, TX 79702 | Oil Operator | Sep 2026 |
| 16 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 17 | Penroc Oil Corp. | Hobbs, NM 88241 | Oil & Gas Operator | Jun 2026 |
| 18 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 19 | Permian Natural Resources | Tyler, TX 75701 | Oil & Gas Operator | Sep 2026 |
| 20 | Petralis Energy Resources, LLC | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 21 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Sep 2026 |
| 22 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 23 | Petroreal Inc. | Temple, TX 76503 | Oil & Gas Operator | Sep 2026 |
| 24 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 25 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 26 | Phillips, B. F. Jr., Estate Of | Dallas, TX 75201 | Oil & Gas Operator | Mar 2011 |
| 27 | Phillips, Jack L. | Gladewater, TX 75647 | Oil & Gas Operator | Dec 1997 |
| 28 | Phillips, Jack L. Co. | Gladewater, TX 75647 | Oil & Gas Operator | Sep 2026 |
| 29 | Pinewood Exploration Inc. | Arlington, TX 76096 | Oil & Gas Operator | Oct 2011 |
| 30 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 31 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 32 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 33 | Ponta E&P LLP | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 34 | Powell, Gene Investments, Inc. | Longview, TX 75608 | Oil & Gas Operator | Apr 2024 |
| 35 | Powell, N. P. Estate | Tyler, TX 75702 | Oil & Gas Operator | Aug 1997 |
| 36 | Powell, N. P. Estate Partnership | Tyler, TX 75702 | Oil & Gas Operator | May 2002 |
| 37 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Sep 2026 |
| 38 | Praxis Energy, LLC | Midland, TX 79705 | Oil Operator | Apr 2002 |
| 39 | Preston Exploration LLC | Spring, TX 77387 | Oil & Gas Operator | Dec 2014 |
| 40 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2015 |
| 41 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 42 | Princess Three Operating, LLC | Henderson, TX 75653 | Oil & Gas Operator | Sep 2026 |
| 43 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 44 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Sep 2026 |
| 45 | Proven Natural Resources LLC | Canton, TX 75103 | Oil & Gas Operator | Sep 2026 |
| 46 | Providence Oil & Gas Corp | Tulsa, OK 74135-5463 | Oil & Gas Operator | May 2005 |
| 47 | Psi Production, Inc. | Tyler, TX 75702 | Gas Operator | Jan 1994 |
| 48 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 49 | PXP Texas Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2007 |