| 1 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 2 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 3 | Patrick Petroleum Corp. | | Oil & Gas Operator | Oct 1984 |
| 4 | Peco Foods, Inc. | | Oil & Gas Operator | Jul 2025 |
| 5 | Pennzoil Exploration & Production Co. | Carthage, TX 75633 | Oil & Gas Operator | Mar 2008 |
| 6 | Pete'S Pumping & Well Services, LLC | Butler, AL 36904 | Oil & Gas Operator | Jul 2025 |
| 7 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 8 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 9 | Petroleum Corporation Of Texas | Breckenridge, TX 76024 | Oil & Gas Operator | May 2002 |
| 10 | Petronova, LLC | | Gas Operator | Jul 2014 |
| 11 | Petrus Oil Company., L.P. | | Oil & Gas Operator | Dec 1989 |
| 12 | PGP Operating, LLC | Vance, AL 35490 | Gas Operator | Jul 2025 |
| 13 | Phillips Petroleum Company | Houston, TX 77251 | Oil & Gas Operator | Mar 2013 |
| 14 | Phoenix Resources-Alabama, LLC | | Gas Operator | Nov 2004 |
| 15 | Placid Oil Company | Houston, TX 77227 | Oil & Gas Operator | Mar 2008 |
| 16 | Pollard Operating, LLC | | Oil Operator | May 2001 |
| 17 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2025 |
| 18 | Prospective Investment & Trading Co., LTD., The | Tulsa, OK 74170-2320 | Oil & Gas Operator | Apr 2014 |
| 19 | Pruet & Hughes | | Oil & Gas Operator | Jul 1977 |
| 20 | Pruet & Hughes Co. | | Oil & Gas Operator | Jan 1978 |
| 21 | Pruet & Hughes Operating Co. | | Oil & Gas Operator | May 1981 |
| 22 | Pruet Production Co. | Jackson, MS 39201 | Oil & Gas Operator | Jul 2025 |
| 23 | Pruet Production Co. & Moon & Hines | | Oil & Gas Operator | Jun 2013 |
| 24 | Pruet Production Co.-Midroc Oper. Co. & Watkins, H. Vaughan,Jr. | | Oil & Gas Operator | Sep 1994 |