| 1 | Packard Gas Company | Irving, TX 75063 | Oil & Gas Operator | Nov 2006 |
| 2 | Palace Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2009 |
| 3 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 4 | Parker & Parsley Producing L.P. | Midland, TX 79702 | Oil & Gas Operator | Oct 1997 |
| 5 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 6 | Petro Vest, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 2014 |
| 7 | Petro-Smith Operating LLC | Houston, TX 77010 | Oil & Gas Operator | Oct 2025 |
| 8 | Petrocorp Incorporated,A TX.Corp | Tulsa, OK 74170 | Oil & Gas Operator | Apr 2005 |
| 9 | Petroquest Energy, L.L.C. | Lafayette, LA 70505 | Oil & Gas Operator | Oct 2025 |
| 10 | Petrosaurus, Inc. | Somerset, TX 78069 | Oil Operator | Oct 2025 |
| 11 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 12 | Pioneer Resources Producing, L.P | Irving, TX 75039 | Oil & Gas Operator | Feb 2001 |
| 13 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 14 | Plains Marketing, LP | Cushing, OK 74023 | Oil Operator | Jan 2012 |
| 15 | Plains Production Inc | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 1995 |
| 16 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 17 | Plantation Operating Co., Inc. | Holliday, TX 76366 | Oil & Gas Operator | Oct 2025 |
| 18 | Poco LLC | Houston, TX 77270 | Oil & Gas Operator | Oct 2025 |
| 19 | Polaris Enterprises Inc | Houston, TX 77057 | Oil & Gas Operator | Oct 1998 |
| 20 | Poynor Corporation | Beaumont, TX 77706 | Oil & Gas Operator | Oct 2025 |
| 21 | Prize Operating Company | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2016 |
| 22 | Proex Energy Management, L.L.C. | Spring, TX 77386 | Oil & Gas Operator | Oct 2025 |
| 23 | Progenies Operating LLC | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 24 | Prolithic Energy Company, L.P. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2002 |
| 25 | Promise Energy Operations, LLC | Texas City, TX 77592 | Oil Operator | Oct 2025 |
| 26 | Puls, W. L. | Houston, TX 77084 | Oil & Gas Operator | Sep 2002 |