| 20101 | Natchez Pipe & Equip. Co., Inc | | Oil Operator | Nov 1981 |
| 20102 | Nathan C. Hale | | Oil & Gas Operator | Jan 2025 |
| 20103 | Nathan Hale Oil Co. | | Oil & Gas Operator | Jan 2025 |
| 20104 | Nathan Petroleum Corp., Yahn & Yahn Inc | Rexville, NY 14877 | Oil & Gas Operator | Dec 2024 |
| 20105 | Nathan Petroleum Corporation | Rexville, NY 14877 | Oil & Gas Operator | Dec 2024 |
| 20106 | National Coopera | | Oil & Gas Operator | Mar 1992 |
| 20107 | National Cooperative Refinery Assoc. | Great Bend, KS 67530 | Oil & Gas Operator | Feb 2023 |
| 20108 | National Cooperative RFG Assoc | McPherson, KS 67460-1404 | Oil & Gas Operator | Jun 2006 |
| 20109 | National Develop | | Oil & Gas Operator | Jan 1990 |
| 20110 | National Energy Exp Inc | Newark, OH 43055 | Oil & Gas Operator | Dec 2024 |
| 20111 | National Energy Group, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Sep 2014 |
| 20112 | National Exploration Company | | Oil & Gas Operator | Mar 1982 |
| 20113 | National Fuel Corporation | Greenwood VIllage, CO 80111 | Oil & Gas Operator | May 2025 |
| 20114 | National Fuel Gas Supply Corporation | | Gas Operator | Dec 2010 |
| 20115 | National Investors Group | Warren, OH 44481 | Oil & Gas Operator | Nov 1996 |
| 20116 | National Offshore LP | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2008 |
| 20117 | National Oil Com | | Oil & Gas Operator | Oct 1992 |
| 20118 | National Oil Company | Garden City, KS 67846 | Oil & Gas Operator | Jun 2024 |
| 20119 | National Oil Company (Ohio) The | Columbus, OH 43215 | Oil & Gas Operator | Sep 1999 |
| 20120 | National Onshore LP | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2008 |
| 20121 | National Petrole | | Oil & Gas Operator | Dec 1996 |
| 20122 | National Petroleum Reserves, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2012 |
| 20123 | National Pride Operating | Parker, CO 80134 | Oil & Gas Operator | Dec 2017 |
| 20124 | National Surface & Minerals, LLC | Addison, TX 75001 | Gas Operator | Jan 2023 |
| 20125 | National Treasure Mines | San Marina, CA 91118 | Oil Operator | Dec 1998 |
| 20126 | Native Exploration Operating LLC | Oklahoma City, OK 73102-5804 | Oil & Gas Operator | Apr 2025 |
| 20127 | Native Gas Company LLC | Edmond, OK 73083-7435 | Oil & Gas Operator | Mar 2015 |
| 20128 | Natl Fuel Gas Supply Corp | Williamsville, NY 14221-5887 | Oil & Gas Operator | Dec 2009 |
| 20129 | Natland Energy Corp | New Philadelphi, OH 44663 | Oil & Gas Operator | Dec 1996 |
| 20130 | Natomas North America Inc | | Oil & Gas Operator | Aug 1993 |
| 20131 | Natomas-McCormick-Coastal | | Oil & Gas Operator | Feb 1984 |
| 20132 | Natrona County Holdings LLC | Austin, TX 78701 | Oil & Gas Operator | Nov 2020 |
| 20133 | Natural Capital LLC | Castle Rock, CO 80104 | Oil & Gas Operator | Dec 2009 |
| 20134 | Natural Energy Dev Corp | Pittsburgh, PA 15241-1548 | Oil & Gas Operator | Dec 2018 |
| 20135 | Natural Energy, Inc. | Abilene, TX 79608 | Oil & Gas Operator | Jul 1997 |
| 20136 | Natural Gas & Oi | | Gas Operator | Dec 1987 |
| 20137 | Natural Gas & Oil, Inc. | Fayette, AL 35555 | Oil & Gas Operator | Mar 2025 |
| 20138 | Natural Gas Anadarko Company | Perryton, TX 79070 | Oil & Gas Operator | Jul 2025 |
| 20139 | Natural Gas Anadarko Inc | Perryton, TX 79070 | Oil & Gas Operator | May 1999 |
| 20140 | Natural Gas Compression Corp | Cleveland, OK 74020 | Oil & Gas Operator | Jan 2025 |
| 20141 | Natural Gas Corp Of Ca | Vernal, UT 84078 | Oil & Gas Operator | Jun 1989 |
| 20142 | Natural Gas Corp Of California | Vernal, UT 84078 | Oil & Gas Operator | Dec 1989 |
| 20143 | Natural Gas Corp. Of Calif. | | Oil & Gas Operator | Dec 1987 |
| 20144 | Natural Gas Expl | | Oil & Gas Operator | Jul 1990 |
| 20145 | Natural Gas MKTG. & Storage Co. | Houston, TX 77251 | Oil & Gas Operator | Sep 1996 |
| 20146 | Natural Gas Pipeline Co Of Am LLC | Downers Grove, IL 60515-3708 | Oil & Gas Operator | Mar 2015 |
| 20147 | Natural Gas Pipeline Co Of Amer. | Houston, TX 77002 | Gas Operator | Jul 2008 |
| 20148 | Natural Gas Processing Company | Worland, WY 82401 | Oil & Gas Operator | Jun 2025 |
| 20149 | Natural Gas Resources Inc | Davenport, IA 52809-1675 | Oil & Gas Operator | Oct 2022 |
| 20150 | Natural Gas Systems, Inc. | | Oil & Gas Operator | Dec 2002 |
| 20151 | Natural Oil & Gas Corp | Bradford, PA 16701 | Oil & Gas Operator | Dec 2023 |
| 20152 | Natural Petroleum Company | Overton, TX 75684 | Oil & Gas Operator | Jun 1994 |
| 20153 | Natural Progression Oil & Gas Corp | Stillwater, OK 74075 | Oil & Gas Operator | May 2025 |
| 20154 | Natural Reserves Group, Inc. | Houston, TX 77057 | Oil & Gas Operator | Jun 1993 |
| 20155 | Natural Resource Corporation | Rock Springs, WY 82901 | Oil & Gas Operator | Sep 1983 |
| 20156 | Natural Resource Group Inc | | Oil & Gas Operator | Jan 2024 |
| 20157 | Natural Resource MGMT. Corp. | | Oil & Gas Operator | Jun 1989 |
| 20158 | Natural Resources Operating LLC | Norman, OK 73071-1295 | Oil & Gas Operator | Jan 2023 |
| 20159 | Naumann Oil & Gas, Inc. | Austin, TX 78716 | Oil & Gas Operator | Jul 2025 |
| 20160 | Nautilus Exploration LLC | Denver, CO 80218 | Oil Operator | Mar 2011 |
| 20161 | Nautilus Exploration, Inc. | Farmers BRNCH, TX 75234 | Oil & Gas Operator | Nov 2021 |
| 20162 | Nautilus Poplar LLC | Poplar, MT 59255 | Oil Operator | Apr 2025 |
| 20163 | Navajo Exploration, Inc. | Corpus Chrsti, TX 78410 | Oil & Gas Operator | Jul 2025 |
| 20164 | Navajo Nation Oil & Gas Co | Window Rock, AZ 86511 | Oil & Gas Operator | Oct 2012 |
| 20165 | Navajo Oil Company | Wichita, KS 67206 | Gas Operator | May 2011 |
| 20166 | Navalo | Rockdale, TX 76567 | Oil Operator | Jul 2025 |
| 20167 | Navarro Exploration Co., Inc. | Kingwood, TX 77345 | Oil & Gas Operator | Jul 2025 |
| 20168 | Navarro Gas Production Company | | Gas Operator | Dec 1996 |
| 20169 | Navarro Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 20170 | Navasota Resources LTD. | | Oil & Gas Operator | Sep 2002 |
| 20171 | Navidad Operating Company, LLC | Flint, TX 75762 | Oil & Gas Operator | Jan 2025 |
| 20172 | Navidad Resources, LLC | Bullard, TX 75757 | Oil & Gas Operator | Jul 2025 |
| 20173 | Navigation Powder River LLC | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 20174 | Navitas Land And Mineral Development, LLC | | Oil Operator | Dec 2016 |
| 20175 | Navitas Oil & Gas LLC | | Gas Operator | Dec 2012 |
| 20176 | Navitas Resources, LLC | | Oil & Gas Operator | May 2016 |
| 20177 | Navus Operating, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Jul 2025 |
| 20178 | Naylor Operating Company LLC | Perryton, TX 79079-9703 | Oil & Gas Operator | Sep 2012 |
| 20179 | Naylor-Pritchard | | Oil Operator | Jul 1987 |
| 20180 | Nbi Services, Inc. | Tulsa, OK 74159 | Oil & Gas Operator | Jul 2025 |
| 20181 | NBL Permian LLC | Houston, TX 77070 | Oil & Gas Operator | Aug 2018 |
| 20182 | NBX Energy, LLC | Wichita Falls, TX 76301 | Oil & Gas Operator | Jul 2025 |
| 20183 | NC Oil Company, Inc. | Humboldt, KS 66748 | Oil Operator | Mar 2025 |
| 20184 | Ncec, Inc. | Winnsboro, TX 75494 | Oil & Gas Operator | May 1994 |
| 20185 | Ncey Holdings, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2013 |
| 20186 | NCL Natural Resources LLC | Spring, TX 77381-5261 | Oil & Gas Operator | Dec 2017 |
| 20187 | NCM Operations, Inc. | | Oil Operator | Oct 2000 |
| 20188 | NCX Company, Inc. | | Oil & Gas Operator | Aug 1999 |
| 20189 | Nea Cross Inc | Erie, PA 16508-2769 | Gas Operator | Dec 1991 |
| 20190 | Neal Lloyd Wayne | Sapulpa, OK 74066-8216 | Oil Operator | Jan 2021 |
| 20191 | Neal, Jack Engineering, Inc. | Abilene, TX 79603 | Oil & Gas Operator | Feb 2011 |
| 20192 | Nearburg Producing Company | Dallas, TX 75380 | Oil & Gas Operator | Jul 2025 |
| 20193 | Neas Operating | Pampa, TX 79065 | Oil & Gas Operator | Oct 2011 |
| 20194 | Neas Operating, LLC | Wimberley, TX 78676 | Oil & Gas Operator | Jul 2025 |
| 20195 | Neatherlin, Earl Inc. | Avoca, TX 79503 | Oil & Gas Operator | Jul 2025 |
| 20196 | Nebo Operating Company | | Oil & Gas Operator | Apr 1991 |
| 20197 | Nec Operating - Kansas, LLC | Southlake, TX 76092 | Oil & Gas Operator | Mar 2025 |
| 20198 | Nec Operating, LLC | Southlake, TX 76092 | Oil & Gas Operator | Jul 2025 |
| 20199 | Necessity Well Service | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 1994 |
| 20200 | Necessity Well Service, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Sep 2006 |