| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Parker & Parsley Petroleum Co. | Oil & Gas Operator | Dec 1990 | |
| 2 | Perdido Energy Louisiana, LLC | Oil & Gas Operator | Dec 2023 | |
| 3 | Petro Harvester Operating Company, LLC | Oil & Gas Operator | Nov 2022 | |
| 4 | Petroleum Exchange | Oil & Gas Operator | Oct 1997 | |
| 5 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 6 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 7 | Pine Prairie Oil Co., Inc. | Oil & Gas Operator | Nov 1983 | |
| 8 | Pomfret Production Co., Inc. | Oil & Gas Operator | Feb 1987 | |
| 9 | Power Reserves, Inc. | Oil Operator | Feb 1999 | |
| 10 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |