| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 3 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 4 | Paragon Resources, Inc | | Oil & Gas Operator | Nov 1991 |
| 5 | Parker & Parsley Development Co. | Midland, TX 79702 | Oil & Gas Operator | May 1995 |
| 6 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 7 | Parker & Parsley Petroleum Co. | | Oil & Gas Operator | Dec 1990 |
| 8 | Partners Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Aug 1995 |
| 9 | Pel-Tex - McMoran | | Oil & Gas Operator | Dec 1985 |
| 10 | Pel-Tex Oil Company, Inc. | | Oil & Gas Operator | Jul 1995 |
| 11 | Pel-Tex, Inc. | | Oil & Gas Operator | Jul 1985 |
| 12 | Penn Resources, Inc. | Dallas, TX 75219 | Oil & Gas Operator | Sep 1987 |
| 13 | Pennzoil E & P Co - Arco | | Oil & Gas Operator | Dec 1993 |
| 14 | Pennzoil E & P Co Et Al | | Oil & Gas Operator | Feb 1999 |
| 15 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 16 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 17 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 18 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 19 | Petroquest Energy, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Feb 2001 |
| 20 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2025 |
| 21 | Petsec Energy Inc. | | Oil & Gas Operator | Sep 2012 |
| 22 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 23 | Phillips Oil Company | Casper, WY 82602 | Oil & Gas Operator | Sep 1986 |
| 24 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 25 | Phoenix Exploration Company LP | | Oil & Gas Operator | Sep 2011 |
| 26 | Phoenix Oil & Gas LTD., L.L.P. | Houston, TX 77010 | Oil & Gas Operator | Jun 2004 |
| 27 | Pilot Resources, Inc. | | Oil & Gas Operator | May 2013 |
| 28 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Jun 2025 |
| 29 | Placid Oil Co., Et Al | | Oil & Gas Operator | Jun 1983 |
| 30 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 31 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 32 | Prentice Oil & Gas Company | | Oil & Gas Operator | Nov 1982 |
| 33 | Primary Fuels, Inc. | Midland, TX 79701-4410 | Oil & Gas Operator | Mar 1991 |
| 34 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 35 | Production Gauging Service Inc | | Oil Operator | Feb 1999 |
| 36 | Production Management Corp. | | Oil & Gas Operator | Jul 1987 |
| 37 | Prospera Energy, Inc. | | Oil & Gas Operator | Dec 2005 |
| 38 | Proven Fuel Exploration, Inc. | | Oil & Gas Operator | Mar 2022 |
| 39 | Pure Resources, L.P. | Midland, TX 79701 | Oil & Gas Operator | Mar 2006 |