| 1 | Padon, Frank B. Oil Oper., Inc. | Houston, TX 77227 | Oil & Gas Operator | Nov 1998 |
| 2 | Palmer Petroleum, Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 3 | Panhandle Oil & Gas Inc | Oklahoma City, OK 73112-5688 | Oil & Gas Operator | May 2007 |
| 4 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 5 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 6 | Patterson Energy Corporation | Dallas, TX 75367 | Oil & Gas Operator | Feb 2026 |
| 7 | Pegasus Operating, Inc. | Coldspring, TX 77331 | Oil & Gas Operator | Feb 2026 |
| 8 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 9 | Perlman,I.H.Oil & Gas Properties | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 10 | Petra Oleum Corp. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 11 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | May 2025 |
| 12 | Petrogulf Corporation | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 13 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 14 | Petromac, Inc. | Onalaska, TX 77360 | Oil & Gas Operator | Feb 2026 |
| 15 | Petronomics, Inc. | Houston, TX 77074 | Oil & Gas Operator | Aug 2003 |
| 16 | Petropro Energy Partners, L.P. | Houston, TX 77024 | Oil & Gas Operator | Jan 2013 |
| 17 | Petrosearch Operating Co, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 18 | Petrovybe Opco LLC | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 19 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 20 | Phoenix Hydrocarbons Operating | Midland, TX 79702 | Oil & Gas Operator | Jun 2024 |
| 21 | Pioneer Natural Res. USA, Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 22 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 23 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 24 | Pmo | Garland, TX 75040 | Oil & Gas Operator | Feb 2018 |
| 25 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 26 | Powell-McCarroll Partnership | Sachse, TX 75048 | Oil & Gas Operator | Feb 2026 |
| 27 | Poynor Corporation | Beaumont, TX 77706 | Oil & Gas Operator | Feb 2026 |
| 28 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 29 | Premier Natural Resources, L.P. | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2007 |
| 30 | Premier Natural Resources, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 31 | Prime Operating Company | Midland, TX 79705 | Oil & Gas Operator | Feb 2026 |
| 32 | Prime Time Oil & Gas Co., LTD. | Ruidoso, NM 88345 | Oil & Gas Operator | Mar 2003 |
| 33 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 34 | Proline Energy Resources Inc | Sugar Land, TX 77479 | Oil & Gas Operator | Feb 2026 |
| 35 | Property Producing Co. | Columbus, TX 78934 | Gas Operator | Feb 2026 |
| 36 | Pyramid Exploration | Houston, TX 77241 | Oil & Gas Operator | Sep 1995 |