| 1 | P. L. O. | Boerne, TX 78006 | Oil & Gas Operator | Jun 2016 |
| 2 | Pablo Energy II, LLC | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2024 |
| 3 | Pablo Energy, Inc. | Pampa, TX 79065 | Oil & Gas Operator | Dec 2005 |
| 4 | Palo Duro Resources LLC | Perryton, TX 79070 | Oil & Gas Operator | Dec 2024 |
| 5 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Dec 2024 |
| 6 | Paramount Producing, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Oct 1996 |
| 7 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 8 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 9 | Parker & Parsley Producing LP | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 10 | Patrick & Vaughn | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2005 |
| 11 | Payne, W. C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Sep 2005 |
| 12 | Peak Texas Resources, LLC | Durango, CO 81301 | Oil & Gas Operator | Mar 2017 |
| 13 | Pennzenergy Exp. & Prod., L.L.C. | Houston, TX 77210 | Oil & Gas Operator | Mar 2000 |
| 14 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 15 | Pennzoil Petroleum Company | Houston, TX 77252 | Oil & Gas Operator | Nov 1999 |
| 16 | Petro-Haley | Borger, TX 79008 | Oil & Gas Operator | Dec 2024 |
| 17 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2024 |
| 18 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 19 | PG-M International Operating,LLC | Borger, TX 79008 | Oil & Gas Operator | Dec 2024 |
| 20 | Philcon Development Co. | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2014 |
| 21 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 22 | Pioneer Natural Res. USA, Inc. | Irving, TX 75038 | Oil & Gas Operator | Dec 2024 |
| 23 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 24 | Plains Exploration & Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Jul 2013 |
| 25 | Plains Marketing LP | Cushing, OK 74023 | Oil & Gas Operator | Dec 2022 |
| 26 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 27 | Pogo Panhandle 2004, L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2017 |
| 28 | Pogo Producing Company LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2024 |
| 29 | Presidio Petroleum LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 30 | Princess Three Corporation | Henderson, TX 75653 | Oil & Gas Operator | Apr 2020 |
| 31 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 32 | Producers Operating Co Inc | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2024 |
| 33 | Proven Reserves Management, Inc. | Dallas, TX 75370 | Oil & Gas Operator | Oct 2024 |
| 34 | PXP Gulf Coast Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2015 |