| 1 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 2 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 3 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4 | Peabody Natural Gas LLC | Gillette, WY 82718 | Oil & Gas Operator | Oct 2025 |
| 5 | Peak Powder River Resources LLC | Durango, CO 81301 | Oil & Gas Operator | Sep 2025 |
| 6 | Pearce Oil Company | Manderson, WY 82432 | Oil Operator | Jun 1999 |
| 7 | Pennaco Energy Incorporated | Gillette, WY 82718 | Oil & Gas Operator | Feb 2021 |
| 8 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 9 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 10 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Oct 2025 |
| 11 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 12 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 13 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 14 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 15 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |