| 1 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 2 | Natural Gas Pipeline Co Of Amer. | Houston, TX 77002 | Gas Operator | Jul 2008 |
| 3 | Neg Operating LLC | Oklahoma City, OK 73101 | Oil & Gas Operator | Jun 2025 |
| 4 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Oct 2025 |
| 5 | New Century Exploration, Inc. | Spring, TX 77379 | Oil & Gas Operator | Oct 2025 |
| 6 | Newfield Expl. Mid-Con. Inc | Tulsa, OK 74172 | Oil & Gas Operator | Jan 2015 |
| 7 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 8 | Newman Corporation | Harleton, TX 75651 | Oil & Gas Operator | Aug 2024 |
| 9 | NFR Energy, LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2017 |
| 10 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 11 | Nolte, Mike E. | Longview, TX 75606 | Oil & Gas Operator | Jun 1995 |
| 12 | Nolte, Mike E., Inc. | Longview, TX 75606 | Oil & Gas Operator | Feb 2006 |
| 13 | Nolteco, Inc. | Longview, TX 75606 | Oil & Gas Operator | Oct 2025 |
| 14 | North Central Casing Pullers,Inc | Graham, TX 76450 | Oil & Gas Operator | Aug 2003 |
| 15 | North Lake Resources LLC | Oklahoma City, OK 73132 | Oil & Gas Operator | Oct 2025 |
| 16 | North Texas Oil & Gas, LLC | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 17 | Northeast Texas Production Co. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2025 |
| 18 | Northland Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2003 |
| 19 | Now Development Co., Inc. | Tyler, TX 75702 | Oil & Gas Operator | Dec 2017 |
| 20 | Nupower Energy, LLC | Houston, TX 77058 | Oil & Gas Operator | Oct 2025 |