| 1 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 2 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 3 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 4 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 5 | Palo Petroleum Inc | Dallas, TX 75360 | Oil & Gas Operator | Dec 2025 |
| 6 | Park Robert E | | Oil Operator | May 1983 |
| 7 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 8 | Pathfinder Energy Inc | Casper, WY 82605 | Oil & Gas Operator | May 2024 |
| 9 | Patrick Petroleum Co. | Jackson, MI 49201 | Oil & Gas Operator | Nov 1993 |
| 10 | Patriot Energy Resources LLC | Golden, CO 80401 | Gas Operator | Aug 2014 |
| 11 | Patriot Production LLC | Southlake, TX 76092 | Oil & Gas Operator | Apr 2023 |
| 12 | Peabody Natural Gas LLC | Gillette, WY 82718 | Oil & Gas Operator | Oct 2025 |
| 13 | Peak Powder River Resources LLC | Durango, CO 81301 | Oil & Gas Operator | Sep 2025 |
| 14 | Pedco Resources Company | Tulsa, OK 74170 | Oil & Gas Operator | Mar 2008 |
| 15 | Pendragon Energy Partners Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2009 |
| 16 | Pennaco Energy Incorporated | Gillette, WY 82718 | Oil & Gas Operator | Feb 2021 |
| 17 | Pennzoil Company | Midland, TX 79710-0090 | Oil & Gas Operator | Mar 2000 |
| 18 | Petro Search Exploration Corp | | Oil & Gas Operator | May 1993 |
| 19 | Petro-Canada Resources (USA) Inc | Denver, CO 80202-472 | Oil & Gas Operator | Feb 2010 |
| 20 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 21 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 22 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 23 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 24 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 25 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 26 | Petrox Resources Inc | Meeker, CO 81641 | Oil & Gas Operator | Oct 2025 |
| 27 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 28 | Phoenix Resources Co | | Oil & Gas Operator | Jun 1984 |
| 29 | Pine Haven Resources LLC | Boulder, CO 80305 | Oil Operator | Oct 2025 |
| 30 | Pine Ridge Petroleum LLC | Moorcroft, WY 82721 | Oil Operator | Oct 2025 |
| 31 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Oct 2025 |
| 32 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 33 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 34 | PML Operating LLC | | Oil Operator | Oct 2025 |
| 35 | Poc-I LLC | Casper, WY 82605 | Oil & Gas Operator | Oct 2025 |
| 36 | Polfam Exploration Co | Denver, CO 80204 | Oil & Gas Operator | Mar 2007 |
| 37 | Polumbus Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 1982 |
| 38 | Powder River Oil | Golden, CO 80401 | Oil & Gas Operator | Sep 2018 |
| 39 | Powder River Royalty Inc | | Oil & Gas Operator | Dec 1986 |
| 40 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Dec 2025 |
| 41 | PRB Oil & Gas Inc | Denver, CO 80202 | Gas Operator | Jul 2008 |
| 42 | Preferred Pipeline Corp. | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 43 | Prenalta Corporation | Terrytown, NY 10591 | Oil & Gas Operator | Jan 1997 |
| 44 | Pride Energy Company An Oklahoma GP | Tulsa, OK 74170 | Oil & Gas Operator | Sep 2025 |
| 45 | Prima Exploration, Inc. | Denver, CO 80206 | Oil & Gas Operator | Oct 2025 |
| 46 | Propel Energy Company | | Oil Operator | Oct 1991 |
| 47 | Prospective Invest & Trad Co LTD | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2005 |
| 48 | Provident Resources LTD | | Oil & Gas Operator | Dec 1986 |
| 49 | Puma Petroleum I | | Oil & Gas Operator | Dec 1988 |
| 50 | Pure Petroleum LLC | Gillette, WY 82717 | Oil & Gas Operator | Aug 2011 |