| 1 | Pacific Enterprise Oil Co USA | Los Angeles, CA 90071-2005 | Oil & Gas Operator | Aug 2012 |
| 2 | Pacific Enterprises Royalty Co | Oklahoma City, OK 73101 | Oil & Gas Operator | Feb 2002 |
| 3 | Palisades Asset Holding Co LLC | Dallas, TX 75201 | Oil & Gas Operator | Aug 2017 |
| 4 | Patina Oil & Gas Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2016 |
| 5 | Pelican Production Company | New Orleans, LA 70130-2477 | Oil & Gas Operator | Mar 2014 |
| 6 | Penn VIrginia MC Operating Co LLC | Houston, TX 77084-7213 | Oil & Gas Operator | Jan 2025 |
| 7 | Petrohawk Operating Company | Houston, TX 77056 | Oil & Gas Operator | Oct 2021 |
| 8 | Petroleum Development Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 9 | Pettigrew Kenny | Spiro, OK 74959 | Gas Operator | Jun 2025 |
| 10 | Piper Operating LLC | Stigler, OK 74462 | Oil & Gas Operator | Jun 2025 |
| 11 | Prentice Napier & Green Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 12 | Priam Operating Company | Tulsa, OK 74114 | Oil & Gas Operator | Jul 2022 |
| 13 | Primary Natural Resources Inc. | Tulsa, OK 74136-6351 | Oil & Gas Operator | Mar 2023 |
| 14 | Primexx Operating Corporation | Dallas, TX 75206 | Oil & Gas Operator | Mar 2024 |
| 15 | Providence Exploration & Production Inc | Fort Smith, AR 72913-5171 | Gas Operator | Dec 2012 |
| 16 | Psec Inc | Tulsa, OK 74102-0871 | Oil & Gas Operator | Dec 2016 |