| 1 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 2 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 3 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 4 | Paloma Operating Co Inc | Houston, TX 77002-5220 | Oil & Gas Operator | Apr 2025 |
| 5 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Mar 2025 |
| 6 | Panhandle Oil & Gas Consultants Inc | Woodward, OK 73802-5011 | Oil & Gas Operator | Jul 2015 |
| 7 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Jul 2025 |
| 8 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 9 | Park Avenue Exploration Corp | Oklahoma City, OK 73102-5604 | Oil & Gas Operator | Sep 2011 |
| 10 | Parker & Parsley Dev LP | Irving, TX 75039-3745 | Oil & Gas Operator | Mar 2015 |
| 11 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 12 | Patina Oklahoma Corp | Duncan, OK 73533-9523 | Oil & Gas Operator | Nov 2014 |
| 13 | Pawnee Petroleum Company | Seminole, OK 74868-0951 | Oil & Gas Operator | Feb 2023 |
| 14 | Payne Exploration Company | Crescent, OK 73028 | Oil & Gas Operator | Apr 2025 |
| 15 | Pearl Oil Company | Nichols Hills, OK 73120-1408 | Oil & Gas Operator | Nov 2023 |
| 16 | Pegasus Energy Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Mar 2015 |
| 17 | Pengo Petroleum, Inc. | | Oil & Gas Operator | Dec 2013 |
| 18 | Perkins Energy Company | Duncan, OK 73533-3853 | Oil & Gas Operator | May 2025 |
| 19 | Petro Speed Inc | Norman, OK 73069-8116 | Oil & Gas Operator | Mar 2015 |
| 20 | Petro-Management Assoc., Inc. | Edmond, OK 73083-2346 | Oil & Gas Operator | Jun 2007 |
| 21 | Petrocorp Incorporated | Tulsa, OK 74170 | Oil & Gas Operator | Nov 2021 |
| 22 | Petroleum Inc | Wichita, KS 67202 | Oil & Gas Operator | Oct 2021 |
| 23 | Petroleum Investment Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Nov 1998 |
| 24 | Petroleum Properties MGMT. Co. | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2014 |
| 25 | Petroleum Reserve Corporation | Plymouth MTNG, PA 19462 | Oil & Gas Operator | May 2008 |
| 26 | Pine Ridge Energy Inc | Cyril, OK 73029 | Oil & Gas Operator | Apr 2025 |
| 27 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Apr 2025 |
| 28 | Pitco Production Company | Tulsa, OK 74170-2320 | Oil & Gas Operator | May 2013 |
| 29 | Plains Resources Group LLC | Wynnewood, OK 73098 | Oil & Gas Operator | Apr 2025 |
| 30 | Plains Resources Inc. | Houston, TX 77002 | Oil & Gas Operator | Jul 2008 |
| 31 | Plainsmen Energy LLC | Enid, OK 73703-5747 | Oil & Gas Operator | May 2025 |
| 32 | Plotner Ralph Oil & Gas Inv Co | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2021 |
| 33 | Post Oak Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Jul 2013 |
| 34 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | May 2025 |
| 35 | Pride Energy Company | Tulsa, OK 74170 | Oil & Gas Operator | Jul 2025 |
| 36 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 37 | Prime Operating Company | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 38 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 39 | Prospective Investment & Trading | Scottsdale, AZ 85261-4190 | Oil & Gas Operator | Jun 2016 |
| 40 | Protege Energy LLC | Tulsa, OK 74135 | Oil & Gas Operator | Jan 2018 |