| 1 | P & P Producing Inc | Midland, TX 79702 | Oil & Gas Operator | Feb 2015 |
| 2 | P.C.S.I. | | Oil & Gas Operator | Jun 1987 |
| 3 | Pacific Enterprises Oil Co. (USA) | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 4 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 5 | Palmer Petroleum Inc. | Shreveport, LA 71105 | Oil & Gas Operator | Jun 2025 |
| 6 | Panther Bayou Energy, LLC | Houston, TX 77070 | Oil & Gas Operator | Apr 2021 |
| 7 | Par Exploration Co | | Oil & Gas Operator | Oct 1986 |
| 8 | Parker & Parsley Devpt L P | | Oil & Gas Operator | Oct 1997 |
| 9 | Parnes Oil Company | | Oil Operator | Jul 1994 |
| 10 | Paxton Oil Company | | Oil & Gas Operator | Dec 2024 |
| 11 | Paxton Petroleum, LTD. | | Oil & Gas Operator | May 1989 |
| 12 | Pay Oil, L. L. C. | | Oil & Gas Operator | Jan 2025 |
| 13 | Pengo Petroleum, Inc. | | Oil & Gas Operator | Dec 2013 |
| 14 | Pennington Oil & Gas Int, LLC | | Oil & Gas Operator | Dec 2024 |
| 15 | Pennington Operating Company, LLC | | Oil & Gas Operator | Jul 2020 |
| 16 | Perdure Petroleum LLC | Allen, TX 75013 | Oil & Gas Operator | Oct 2021 |
| 17 | Petro "E", LLC | | Oil & Gas Operator | Feb 2010 |
| 18 | Petro Harvester Operating Company, LLC | | Oil & Gas Operator | Nov 2022 |
| 19 | Petro-Guard Production,L.L.C. | Houston, TX 77063 | Oil & Gas Operator | Dec 2024 |
| 20 | Petro-Lewis Corp. | | Oil & Gas Operator | Feb 1994 |
| 21 | Petrodome Operating, LLC | Houston, TX 77265 | Oil & Gas Operator | Jun 2025 |
| 22 | Petroleum Engineers, Inc. | | Oil & Gas Operator | Jun 1983 |
| 23 | Petroleum Exchange | | Oil & Gas Operator | Oct 1997 |
| 24 | Petroleum Management Int'L, Inc. | Sugar Land, TX 77487 | Oil & Gas Operator | Oct 1993 |
| 25 | Petroleum Properties MGMT Corp | | Oil & Gas Operator | Aug 1990 |
| 26 | Petroleum Resources MGMT Corp. | | Oil & Gas Operator | Mar 2002 |
| 27 | Petrosearch, Inc. | | Oil Operator | Jul 1992 |
| 28 | Phillips Energy, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Dec 2018 |
| 29 | Pickens Company, Inc., The | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 30 | Pie La Operating, LLC | | Oil & Gas Operator | Jan 2025 |
| 31 | Planet Operating, LLC | | Oil & Gas Operator | Dec 2024 |
| 32 | Plumb Operating Company, Inc. | | Oil & Gas Operator | Dec 1989 |
| 33 | Post Petroleum Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Aug 2013 |
| 34 | Presidio Exploration, Inc. | Englewood, CO 80155 | Oil & Gas Operator | May 1999 |
| 35 | Prime Rock Resources La LLC | | Oil & Gas Operator | Dec 2024 |
| 36 | Professional Petr. Servs, Inc. | | Oil Operator | Oct 2016 |
| 37 | Pryme Energy, LLC | | Oil & Gas Operator | Feb 2015 |