| 1 | P & C Oil Company | Leona, TX 75850 | Oil & Gas Operator | Sep 2025 |
| 2 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Aug 2025 |
| 3 | Pace Diversified Corporation | | Oil & Gas Operator | Sep 2025 |
| 4 | Pacific Alliance Medical Center | | Oil Operator | Dec 2007 |
| 5 | Pacific Coast Energy Company LP | | Oil & Gas Operator | Sep 2025 |
| 6 | Pacific Energy Resources Inc. | | Oil Operator | Aug 2025 |
| 7 | Pacific Energy Resources LTD | | Oil & Gas Operator | Sep 2009 |
| 8 | Pacific Gas And Electric Company | | Gas Operator | Sep 2025 |
| 9 | Pacific Inland Operating Corporation | | Gas Operator | Dec 1993 |
| 10 | Pacific Palms Petroleum LLC | | Oil & Gas Operator | Sep 2025 |
| 11 | Pacific Petroleum Technology LLC | | Oil & Gas Operator | Dec 2018 |
| 12 | Padre Oil Co. | | Oil & Gas Operator | Sep 2025 |
| 13 | Pan American Energy Corporation | | Oil & Gas Operator | Dec 1998 |
| 14 | Pan Western Petroleum Co. | | Oil & Gas Operator | Dec 1993 |
| 15 | Pancanadian Petroleum Company | | Oil & Gas Operator | Oct 1989 |
| 16 | Panoche Vallecitos Oil Co. | | Oil & Gas Operator | Aug 2025 |
| 17 | Paris Valley Petroleum | | Oil Operator | Dec 2004 |
| 18 | Parlay Oil Company | | Oil Operator | Dec 2002 |
| 19 | Patriot Resources LLC | | Oil & Gas Operator | Sep 2025 |
| 20 | Paul Graham Drilling & Service Co. | | Oil & Gas Operator | Dec 2011 |
| 21 | Paul M. Woodward | | Oil Operator | Aug 2025 |
| 22 | Peak Operator LLC | | Oil & Gas Operator | Aug 2025 |
| 23 | Peninsula Open Space Trust | | Oil & Gas Operator | Dec 2008 |
| 24 | Penn Inc. | | Oil & Gas Operator | Dec 2004 |
| 25 | Pennant Petroleum Corporation | | Oil Operator | Dec 2002 |
| 26 | Pentarch Petroleum | | Oil Operator | Sep 2025 |
| 27 | Peoco LLC | | Gas Operator | Aug 2025 |
| 28 | Petaluma Oil & Gas | | Oil & Gas Operator | Dec 1999 |
| 29 | Petersen Production Company LLC | | Oil & Gas Operator | Dec 2019 |
| 30 | Petro Capital Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 31 | Petro Nova | | Oil Operator | Dec 2000 |
| 32 | Petro Resources, Inc. | Fulton, TX 78358 | Oil & Gas Operator | Nov 2025 |
| 33 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 34 | Petro-Lud Inc. | | Oil & Gas Operator | Sep 2025 |
| 35 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Nov 2025 |
| 36 | Petrominerals Corp. | | Oil & Gas Operator | Dec 2003 |
| 37 | Petroprize | | Oil & Gas Operator | Sep 2025 |
| 38 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 39 | Petrowest | | Oil & Gas Operator | Dec 2001 |
| 40 | Philip H. McAlmond | | Oil Operator | Dec 2002 |
| 41 | Philip R. McPharlin | | Oil & Gas Operator | Dec 1995 |
| 42 | Phillip & Phyllis Pace-Trustee | | Oil & Gas Operator | Dec 2007 |
| 43 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 44 | Pier Oil Company Inc. | | Oil Operator | Aug 2025 |
| 45 | Pine Meadows Ranch Incorporated | | Oil & Gas Operator | Dec 2001 |
| 46 | Pioneer Exploration, LLC | Houston, TX 77090 | Oil & Gas Operator | Sep 2025 |
| 47 | Plegel Oil Company Inc. | | Oil & Gas Operator | Sep 2025 |
| 48 | Polaris Production Inc. | | Oil & Gas Operator | Feb 2021 |
| 49 | Pool California Energy Services Inc. | | Oil Operator | Dec 2009 |
| 50 | Portals Woodward Joint Venture | | Oil Operator | Dec 2000 |
| 51 | Porter Sesnon Et Al | | Oil & Gas Operator | Dec 1978 |
| 52 | Poso Creek Energy LLC | | Oil & Gas Operator | Dec 2009 |
| 53 | Power Run Oil LLC | | Oil & Gas Operator | Aug 2025 |
| 54 | Powerdrive Energy Services Company LLC | | Oil & Gas Operator | Sep 2025 |
| 55 | Prado Petroleum Co. | | Oil & Gas Operator | Dec 1996 |
| 56 | Pre Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 57 | Premier Pumping Unit Services Inc. | | Oil & Gas Operator | Sep 2025 |
| 58 | Preuitt Production Service | | Oil Operator | Aug 2025 |
| 59 | Princeton Natural Gas LLC | | Gas Operator | Aug 2025 |
| 60 | Production Specialties Company | | Oil & Gas Operator | Dec 2003 |
| 61 | Protho Energy Service LLC | | Oil & Gas Operator | Sep 2025 |
| 62 | PS126 Investments LLC | | Oil & Gas Operator | Aug 2025 |
| 63 | Pueblo Oil & Gas Inc. | | Gas Operator | Dec 2003 |
| 64 | Pyramid Oil Co. | Litchfield PK, AZ 85340 | Oil & Gas Operator | Jan 2018 |