| 1 | P & WG Resources L.L.C. | Batson, TX 77519 | Oil & Gas Operator | Jan 2011 |
| 2 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 3 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Nov 2008 |
| 4 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 5 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 6 | Penwell Energy, Inc. | Houston, TX 77057 | Oil & Gas Operator | Dec 2024 |
| 7 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 8 | Petro-Guard Company, Inc. | Houston, TX 77057 | Oil & Gas Operator | Nov 2014 |
| 9 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Jun 2024 |
| 10 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2024 |
| 11 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Aug 2024 |
| 12 | Petroleum Resource Management Co | Fort Worth, TX 76107 | Oil & Gas Operator | Jan 2024 |
| 13 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 14 | Phillips 66 Company | Bartlesville, OK 74004 | Oil & Gas Operator | Aug 1997 |
| 15 | Pitco Investments, LTD. | Scottsdale, AZ 85261 | Oil & Gas Operator | Jan 2013 |
| 16 | Pittencrieff (Gulf Coast), Inc. | Abilene, TX 79608 | Oil & Gas Operator | Sep 1998 |
| 17 | Pittencrieff America Inc | Abilene, TX 79608 | Oil & Gas Operator | Feb 2003 |
| 18 | Placid Operating, LLC | Dallas, TX 75230 | Oil & Gas Operator | Jul 2021 |
| 19 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 20 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 21 | Porter, James W. | Houston, TX 77240 | Oil & Gas Operator | Oct 1993 |
| 22 | Porter, James W. Special | Blanco, TX 78606 | Oil & Gas Operator | Dec 2024 |
| 23 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Dec 2024 |
| 24 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Dec 2024 |
| 25 | Primrose Resources, LLC | Cedar Park, TX 78630 | Oil & Gas Operator | Dec 2024 |
| 26 | Pyramid Exploration | Houston, TX 77241 | Oil & Gas Operator | Sep 1995 |