| 1 | Palace Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Mar 2007 |
| 2 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 3 | Patriot Operating Company, Inc. | Houston, TX 77008 | Oil & Gas Operator | Sep 2003 |
| 4 | Pax Petroleum Corporation | La Jolla, CA 92037 | Oil & Gas Operator | Mar 2008 |
| 5 | Peles, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 6 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 7 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 8 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 9 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | Dec 2024 |
| 10 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 11 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Aug 2024 |
| 12 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 13 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 14 | Petrotx Operating, LLC | Kingwood, TX 77339 | Oil & Gas Operator | Dec 2024 |
| 15 | PH Exploration, Inc. | Houston, TX 77008 | Oil & Gas Operator | Nov 2001 |
| 16 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 17 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 18 | Pi Energy, Inc. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2024 |
| 19 | Pierce Junction Petroleum Inc. | Houston, TX 77002 | Oil & Gas Operator | May 2010 |
| 20 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 21 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Dec 2024 |
| 22 | Poco Oil Co. | Houston, TX 77069 | Oil & Gas Operator | Mar 1997 |
| 23 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 24 | Primal Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2024 |
| 25 | Prime Natural Resources, Inc. | Houston, TX 77042 | Oil & Gas Operator | Jun 2007 |
| 26 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Dec 2024 |
| 27 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | Dec 2024 |
| 28 | Pringle Resources, Inc. | Houston, TX 77019 | Oil & Gas Operator | Dec 2024 |
| 29 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Dec 2024 |
| 30 | Puls Operating Company | Boerne, TX 78006 | Oil & Gas Operator | Dec 2024 |
| 31 | Puls, W. L. | Houston, TX 77084 | Oil & Gas Operator | Sep 2002 |
| 32 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |