| 1 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 2 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Dec 2023 |
| 3 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 4 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Apr 2024 |
| 5 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2017 |
| 6 | Nelson Exploration Corporation | | Oil & Gas Operator | Dec 2023 |
| 7 | Nemaha Environmental Services LLC | Enid, OK 73703 | Oil Operator | Dec 2023 |
| 8 | Neok Production Company LLC | Nowata, OK 74048-0428 | Oil & Gas Operator | Jan 2024 |
| 9 | Nexsreem Corporation | | Oil & Gas Operator | Dec 2020 |
| 10 | Nject Disposal LLC | | Oil Operator | Mar 2017 |
| 11 | NM&O Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 12 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2024 |
| 13 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Apr 2024 |
| 14 | Nordstrand Engineering Inc | Houston, TX 77019 | Oil & Gas Operator | Apr 2024 |
| 15 | Nortex Gas & Oil Co | Tulsa, OK 74135 | Oil & Gas Operator | Sep 1993 |
| 16 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Dec 2023 |
| 17 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 18 | Nye Oil Company | Oklahoma City, OK 73118-1245 | Oil & Gas Operator | Jun 2004 |