| 1 | Nadel And Gussman Rockies, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2012 |
| 2 | Nance Petroleum Corporation | Billings, MT 59103-7168 | Oil & Gas Operator | Nov 2007 |
| 3 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Oct 2025 |
| 4 | Navasota Resources LTD. | | Oil & Gas Operator | Sep 2002 |
| 5 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Nov 2025 |
| 6 | Neptune Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 7 | Nerdlihc Company, Inc. | Long Beach, CA 90815 | Oil & Gas Operator | Nov 2006 |
| 8 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Nov 2025 |
| 9 | Newfield Production Company | The Woodlands, TX 77380-2764 | Oil & Gas Operator | Jul 2022 |
| 10 | Nexen Oil And Gas U.S.A. Inc. | Calgary, AB T2P 5C1 | Oil & Gas Operator | Feb 2010 |
| 11 | NFR Bear Paw Basin, LLC | Houston, TX 77002 | Oil & Gas Operator | Jan 2013 |
| 12 | Nielco, Inc. | Billings, MT 59103 | Oil & Gas Operator | Apr 2002 |
| 13 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Nov 2025 |
| 14 | North American Technical Trading Company, Inc. | Oakbrook Terrace, IL 60181 | Oil Operator | Jan 2011 |
| 15 | Northern Oil Production, Inc. | Bozeman, MT 59718 | Oil & Gas Operator | Aug 2025 |
| 16 | Northern Producing LLC | Shelby, MT 59474 | Oil Operator | Aug 2025 |
| 17 | Northland Holdings, Inc. | Calgary, AB T2J 7H2 | Gas Operator | May 2017 |
| 18 | Northstar Gas Company, Inc. | | Oil & Gas Operator | Jan 2016 |
| 19 | Northwestern Corporation | Butte, MT 59701 | Oil & Gas Operator | Sep 2025 |
| 20 | Northwestern Energy, LLC | Butte, MT 59701 | Oil & Gas Operator | Dec 2004 |
| 21 | NRC Development, LLC | | Gas Operator | Nov 2002 |