| 1 | Nasser Oil & Gas, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 2 | Nat. Gas Pipeline Co Of Amer. | | Oil Operator | Dec 2008 |
| 3 | National Exploration Company | | Oil & Gas Operator | Mar 1982 |
| 4 | National Offshore LP | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 5 | Natomas-McCormick-Coastal | | Oil & Gas Operator | Feb 1984 |
| 6 | NCX Company, Inc. | | Oil & Gas Operator | Aug 1999 |
| 7 | Nerco Oil & Gas, Inc. | | Oil & Gas Operator | Dec 1996 |
| 8 | Nestor Petroleum Company | | Oil & Gas Operator | Jun 1986 |
| 9 | Neumin Production Company | Point Comfort, TX 77978 | Oil & Gas Operator | Oct 2025 |
| 10 | Newfield Exploration Company | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2017 |
| 11 | Newhaven Operating Inc | | Oil & Gas Operator | Dec 1998 |
| 12 | Nicco Operating Co. | | Oil & Gas Operator | May 1990 |
| 13 | Noble Energy Inc | Midland, TX 79706 | Oil & Gas Operator | Oct 2025 |
| 14 | Noex, L.L.C. | Houston, TX 77057 | Oil & Gas Operator | Apr 1998 |
| 15 | Nomeco Oil & Gas Co. | Jackson, MI 49204 | Oil & Gas Operator | Dec 1994 |
| 16 | Norcen Explorer, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 1998 |
| 17 | North American Royalties, Inc. | Chattanooga, TN 37408 | Oil & Gas Operator | Oct 2001 |
| 18 | Northern Michigan Expl Co | | Oil & Gas Operator | Jul 1990 |
| 19 | Northstar Offshore Group, LLC | | Oil & Gas Operator | Apr 2020 |
| 20 | Northwest Oil Company | Dallas, TX 75204 | Oil & Gas Operator | Jun 2014 |
| 21 | Nuevo Energy Company | Houston, TX 77002 | Oil & Gas Operator | Dec 2002 |