| 1 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 2 | Pan American Petroleum Corp. | | Oil & Gas Operator | Nov 1988 |
| 3 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 4 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 5 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 6 | Paul Rankin Inc. | | Oil & Gas Operator | May 2026 |
| 7 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 8 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 9 | Peregrine Petroleum Partners, LTD | | Oil & Gas Operator | Oct 2021 |
| 10 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 11 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | May 2026 |
| 12 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Jul 2026 |
| 13 | Petroshale (Us) Inc. | | Oil & Gas Operator | May 2026 |
| 14 | Phillip D. Armstrong | | Oil & Gas Operator | Sep 2018 |
| 15 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | May 2026 |
| 16 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 17 | Pride Energy, An Oklahoma General Partnership | | Oil & Gas Operator | Dec 2020 |
| 18 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Jun 2026 |
| 19 | Primewest Petroleum, Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 20 | Prospective Investment And Trading Co., LTD | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 21 | Prosper Energy Corp. | | Oil & Gas Operator | Oct 1988 |