| 1 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 2 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 3 | Pan American Petroleum Corp | | Oil & Gas Operator | Jan 2008 |
| 4 | Panamerican Operating Inc | Dallas, TX 75219 | Oil & Gas Operator | Oct 2025 |
| 5 | Panther Creek Resources, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2012 |
| 6 | Panther Energy Company, LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2022 |
| 7 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 8 | Paul Rankin Inc. | | Oil & Gas Operator | Aug 2025 |
| 9 | PDC Corporation | | Oil & Gas Operator | Jan 2011 |
| 10 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 11 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 12 | Peregrine Petroleum Partners, LTD | | Oil & Gas Operator | Oct 2021 |
| 13 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 14 | Petro-Hunt Dakota, LLC | | Oil & Gas Operator | Aug 2025 |
| 15 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 16 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 17 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 18 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 19 | Petroshale (Us) Inc. | | Oil & Gas Operator | Aug 2025 |
| 20 | Phillip D. Armstrong | | Oil & Gas Operator | Sep 2018 |
| 21 | Phillips & Ralph M. Ballard | | Oil Operator | Jan 1960 |
| 22 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 23 | Phoenix Operating LLC | Denver, CO 80237 | Oil & Gas Operator | Aug 2025 |
| 24 | Phoenix Petroleum, LLC | | Oil & Gas Operator | Aug 2025 |
| 25 | Pintail Petroleum Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2010 |
| 26 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 27 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 28 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 29 | Prairie Production, Inc. | | Oil & Gas Operator | Apr 2020 |
| 30 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 31 | Pride Energy, An Oklahoma General Partnership | | Oil & Gas Operator | Dec 2020 |
| 32 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Aug 2025 |
| 33 | Primewest Petroleum Inc. | Centennial, CO 80111 | Oil & Gas Operator | Jan 2009 |
| 34 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 35 | Prosper Energy Corporation | | Oil & Gas Operator | Oct 1988 |
| 36 | Proven Petroleum, Inc. | Lakewood, CO 80228 | Oil & Gas Operator | Aug 2025 |