| 1 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 2 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2024 |
| 3 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 4 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Apr 2024 |
| 5 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 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 | Pathfinder Exploration LLC | Norman, OK 73069-8516 | Gas Operator | Nov 2008 |
| 9 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 10 | Peak Operating Of Texas, LLC | Denver, CO 80202 | Oil & Gas Operator | May 2005 |
| 11 | Pegasus Energy | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 1997 |
| 12 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 13 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 14 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Apr 2024 |
| 15 | Petro-Hunt Corporation | Dallas, TX 75201 | Oil & Gas Operator | Jun 2003 |
| 16 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2024 |
| 17 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 18 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 19 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 20 | Phoenix Operating Company Of TX. | Dallas, TX 75206 | Oil & Gas Operator | Jun 1995 |
| 21 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 22 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 23 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 24 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 25 | Plantation Operating, LLC | Houston, TX 77041 | Oil & Gas Operator | Nov 2011 |
| 26 | PNG Operating Company | Oklahoma City, OK 73172 | Oil & Gas Operator | Apr 2024 |
| 27 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 28 | Pogo Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jan 2008 |
| 29 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 30 | Ponderosa TX Operating LLC | Stinnett, TX 79083 | Oil & Gas Operator | Apr 2024 |
| 31 | Pool, Lloyd Operating | Sandia Park, NM 87047 | Gas Operator | Dec 2013 |
| 32 | Prairie Energy Company | Fort Worth, TX 76185 | Oil & Gas Operator | Mar 2003 |
| 33 | Prairie Oil Company | Pampa, TX 79066 | Oil & Gas Operator | Jan 2017 |
| 34 | Premier Energy, Inc. | Shamrock, TX 79079 | Oil & Gas Operator | Mar 2008 |
| 35 | Presidio Petroleum LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2024 |
| 36 | Prize Exploration & Prod, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2024 |
| 37 | Production Gathering Company, LP | Dallas, TX 75206 | Oil & Gas Operator | Apr 2024 |
| 38 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |
| 39 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |
| 40 | Pyramid Energy Inc | San Antonio, TX 78216 | Oil & Gas Operator | Feb 2012 |