| 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 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 4 | Natural Progression Oil & Gas Corp | Stillwater, OK 74075 | Oil & Gas Operator | Jul 2025 |
| 5 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Oct 2025 |
| 6 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |
| 7 | Nelson Exploration Corporation | Cleveland, OK 74020-5725 | Oil & Gas Operator | Jul 2025 |
| 8 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 9 | New Century Petroleum Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | May 2013 |
| 10 | New Dominion LLC | Tulsa, OK 74119-3220 | Oil & Gas Operator | Jun 2025 |
| 11 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 12 | Newkumet Exploration, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2020 |
| 13 | Nexus Resources Corporation | Drumright, OK 74030 | Oil & Gas Operator | Jan 2013 |
| 14 | Nielson & Associates Inc | Cody, WY 82414 | Oil & Gas Operator | Feb 2016 |
| 15 | Nivens Productions LLC | Coyle, OK 73027-9785 | Oil & Gas Operator | Aug 2024 |
| 16 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 17 | Noble Energy Production Inc | Houston, TX 77067 | Oil & Gas Operator | Oct 2025 |
| 18 | Nondorf Oil & Gas Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2008 |
| 19 | Norman Production Company | Chandler, OK 74834-8538 | Oil & Gas Operator | May 2015 |
| 20 | North Star Exploration Company | Oklahoma City, OK 73116 | Oil & Gas Operator | May 2025 |