| 1 | National Cooperative RFG Assoc | McPherson, KS 67460-1404 | Oil & Gas Operator | Jun 2006 |
| 2 | National Energy Group Inc | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 3 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 4 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 5 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 6 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Dec 2024 |
| 7 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Apr 2017 |
| 8 | Neok Production Company LLC | Nowata, OK 74048 | Oil & Gas Operator | Oct 2024 |
| 9 | NFC Petroleum Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1996 |
| 10 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 11 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2024 |
| 12 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 13 | Noble Operating, LLC | Flower Mound, TX 75028 | Oil & Gas Operator | Sep 2013 |
| 14 | Northbrook Oil & Gas Co LLC | Norman, OK 73072 | Oil & Gas Operator | Nov 2014 |
| 15 | Northbrook Oil & Gas Company | Norman, OK 73070-4916 | Oil & Gas Operator | Jun 2016 |
| 16 | Northport Production Company | Oklahoma City, OK 73113 | Oil & Gas Operator | Sep 2024 |
| 17 | Nova Energy Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2003 |
| 18 | Nyc Resources LTD | Tulsa, OK 74133-5700 | Oil & Gas Operator | Sep 2014 |