| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | Pace Royalty Trust Fund, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Nov 2001 |
| 3 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Dec 2024 |
| 4 | Paloma Natural Gas, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2024 |
| 5 | Pan-Ok Production Company | | Oil & Gas Operator | Jul 2024 |
| 6 | Par Exploration Co | | Oil & Gas Operator | Oct 1986 |
| 7 | Par Minerals Corporation | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 8 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 9 | Patton Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 10 | Pearl Resources Inc. | | Oil & Gas Operator | Jul 1990 |
| 11 | Pedernales Petroleum Operating, LLC | | Oil & Gas Operator | Jun 2024 |
| 12 | Pelican Producing Co. | | Gas Operator | Nov 1992 |
| 13 | Pelto Oil Co | Houston, TX 77002 | Oil & Gas Operator | Nov 1998 |
| 14 | Pennzenergy Explor & Prod LLC | | Oil & Gas Operator | Dec 1999 |
| 15 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 16 | Peoples Energy Prod.-TX, L.P. | Houston, TX 77002 | Oil & Gas Operator | Sep 2007 |
| 17 | Perkins Oil Properties | | Oil & Gas Operator | May 2024 |
| 18 | Perry Point, Inc. | | Oil Operator | Mar 2022 |
| 19 | Pesco | | Oil & Gas Operator | Oct 1984 |
| 20 | Petro-Chem Operating Company, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2024 |
| 21 | Petro-Hunt, L.L.C. | Dallas, TX 75201 | Oil & Gas Operator | Dec 2024 |
| 22 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 23 | Petroleum Recovery & Expl Inc. | | Oil Operator | Oct 1984 |
| 24 | PG&E Resources Company | Houston, TX 77042 | Oil & Gas Operator | May 1995 |
| 25 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 26 | Phoenix Opr Co Inc-Petrovest | | Oil Operator | Dec 1992 |
| 27 | Pinnacle Operating Company, Inc. | Shreveport, LA 71135 | Oil & Gas Operator | Dec 2024 |
| 28 | Pintail Minerals Corp. | | Gas Operator | Jun 1992 |
| 29 | Pioneer Natural Resources USA Inc | Irving, TX 75039 | Oil & Gas Operator | Aug 2024 |
| 30 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 31 | Premier Natural Resources II,LLC | Tulsa, OK 74105 | Oil & Gas Operator | Feb 2015 |
| 32 | Pritchard Engineering | | Oil & Gas Operator | Mar 1989 |
| 33 | Procell & Procell | | Oil & Gas Operator | Jan 2003 |
| 34 | Producers Gas Transmission Inc | | Oil Operator | May 2024 |