| 1 | Pacific Atlantic Oil Co. | | Oil & Gas Operator | Dec 2003 |
| 2 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 3 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 4 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 5 | Paragon Resources, Inc | | Oil & Gas Operator | Nov 1991 |
| 6 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 7 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 8 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 9 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 10 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 11 | Petrocan, Inc. | | Oil & Gas Operator | Apr 1998 |
| 12 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 13 | Petroleum Production MGMT., Inc. | Kansas City, MO 64112 | Oil & Gas Operator | Oct 2025 |
| 14 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 15 | Phillips Lake Corp. | | Oil Operator | Dec 1985 |
| 16 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 17 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 18 | Pine Island Operating, L.L.C. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 19 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Oct 2025 |
| 20 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Aug 2025 |
| 21 | Pioneer Prod. Corp. | | Oil & Gas Operator | Jun 1986 |
| 22 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 23 | Pool Company | | Oil Operator | Dec 2002 |
| 24 | Pool Production Services | | Oil Operator | Aug 1990 |
| 25 | Pride Exploration, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Jul 2015 |
| 26 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Jul 2025 |