| 1 | P & A Well Service | | Oil & Gas Operator | Jan 1994 |
| 2 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 3 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 4 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 5 | Pan-Ok Production Company | | Oil & Gas Operator | Nov 2024 |
| 6 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 7 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 8 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 9 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 10 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 11 | Perdido Energy Louisiana, LLC | | Oil & Gas Operator | Dec 2024 |
| 12 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 13 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 14 | Petrofunds, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 1996 |
| 15 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 16 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 17 | Philip Services/Louisiana Inc. | | Oil Operator | Dec 2000 |
| 18 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 19 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 20 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 21 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 22 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 23 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 24 | Plumb Operating Company, Inc. | | Oil & Gas Operator | Dec 1989 |
| 25 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 26 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 27 | Proton Energy, L.L.C. | Houston, TX 77002 | Oil & Gas Operator | Jun 2005 |
| 28 | PSC Industrial Outsourcing, LP | | Oil Operator | Dec 2024 |
| 29 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 30 | PXP Louisiana L.L.C. | | Oil & Gas Operator | Nov 2010 |