| 1 | Pa Prospect LLC | Columbus, MT 59019 | Oil & Gas Operator | Jul 2020 |
| 2 | Padon, Frank B. Oil Oper., Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1998 |
| 3 | Paleo Oil Company LLC | Corpus Chrsti, TX 78411 | Oil & Gas Operator | Feb 2026 |
| 4 | Paradis Investments, L.L.C. | Bellaire, TX 77401 | Oil Operator | Jun 2020 |
| 5 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 6 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 7 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 8 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 9 | Patara Oil & Gas LLC | Dallas, TX 75219 | Oil & Gas Operator | Mar 2018 |
| 10 | Patterson Petroleum LLC | Snyder, TX 79550 | Oil & Gas Operator | Oct 2007 |
| 11 | Patterson Petroleum LP | Snyder, TX 79550 | Oil & Gas Operator | Mar 2008 |
| 12 | Peach Creek Operating Co, LLC | Houston, TX 77018 | Oil & Gas Operator | Feb 2026 |
| 13 | Pecos Petroleum Company | Houston, TX 77057 | Oil & Gas Operator | Oct 1999 |
| 14 | Pegasus Operating, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | Feb 2026 |
| 15 | Penn VIrginia Oil & Gas Corp | Houston, TX 77024 | Oil & Gas Operator | Dec 2023 |
| 16 | Penn VIrginia Oil & Gas, L.P. | Houston, TX 77084 | Oil & Gas Operator | Nov 2022 |
| 17 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 18 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 19 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 20 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 21 | Petrocorp Acquisition Company | Tulsa, OK 74121 | Oil & Gas Operator | Dec 2002 |
| 22 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 23 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 24 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 25 | Petrolero Corp. | San Antonio, TX 78205 | Oil & Gas Operator | Feb 1998 |
| 26 | Petroleum Advisors Int'L., Inc. | Houston, TX 77224 | Gas Operator | Jun 2005 |
| 27 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 28 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 29 | Petrovybe Opco LLC | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 30 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 31 | Pie Operating, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 32 | Pintail Production Co., Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Feb 2026 |
| 33 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 34 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 35 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 36 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 37 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 38 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Feb 2026 |
| 39 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 40 | Powerline Energy Corporation | Arlington, TX 76015 | Oil & Gas Operator | Feb 2026 |
| 41 | Premier Minerals, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 42 | Premium Exploration Company | Early, TX 76803 | Oil & Gas Operator | Feb 2026 |
| 43 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 44 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 45 | Producers Energy Corporation | Houston, TX 77002 | Oil & Gas Operator | Aug 2000 |
| 46 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Feb 2026 |
| 47 | Property Development Group, Inc. | San Antonio, TX 78212 | Oil & Gas Operator | Feb 2026 |
| 48 | Property Producing Co. | Columbus, TX 78934 | Gas Operator | Feb 2026 |
| 49 | Puls, W. L. | Houston, TX 77084 | Oil & Gas Operator | Sep 2002 |
| 50 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |