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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mobil Oil Exploration & Producing Southeast, Inc. | Alabama | 241 BBLs | 599,818 MCF | Aug 1976 - Feb 2026 |
| Mogo Reagan, LLC | Montana | 3,174 BBLs | 9,150 MCF | Nov 2019 - Feb 2026 |
| Montalban Oil & Gas Operations, Inc. | Montana | 2,591 BBLs | 59,418 MCF | Jan 1991 - Mar 2026 |
| Montgomery Production & Operating LLC | Kansas | 998 BBLs | 0 MCF | Jan 2020 - Jan 2026 |
| Morgenstern Oil Operations LLC | Kansas | 1,791 BBLs | 0 MCF | Jan 2020 - Jan 2026 |
| Morningstar Operating LLC | Colorado | 0 BBLs | 151,676 MCF | Jun 2001 - Feb 2026 |
| Morningstar Operating LLC | Montana | 321,602 BBLs | 452,646 MCF | Jan 2024 - Feb 2026 |
| Morningstar Operating LLC | New Mexico | 103,391 BBLs | 2,859,930 MCF | Sep 2020 - Feb 2026 |
| Morningstar Operating LLC | North Dakota | 39,557 BBLs | 49,193 MCF | Oct 2024 - Mar 2026 |
| Mr NM Operating LLC | New Mexico | 6,829 BBLs | 41,534 MCF | Mar 2021 - Mar 2026 |
| MTM Petroleum, Inc. | Kansas | 640 BBLs | 21,125 MCF | Jan 1980 - Jan 2026 |
| Mull Drilling Company Inc | Colorado | 19,800 BBLs | 143,297 MCF | Jan 1999 - Feb 2026 |
| Mull Drilling Company, Inc. | Kansas | 17,004 BBLs | 11,804 MCF | Jan 1980 - Jan 2026 |
| Murex Petroleum Corporation | North Dakota | 198,827 BBLs | 556,848 MCF | Apr 2001 - Mar 2026 |
| Murfin Drilling Co., Inc. | Kansas | 76,070 BBLs | 1,108 MCF | Jan 1980 - Jan 2026 |
| Murfin Drilling Company, Inc. | North Dakota | 5,824 BBLs | 3,923 MCF | Mar 2025 - Mar 2026 |
| Murphrey Oil Company, Inc. | Louisiana | 3,563 BBLs | 0 MCF | Feb 2020 - Jan 2025 |
| Muskegon Operating Company LLC | Michigan | 20,252 BBLs | 299,894 MCF | Jan 2021 - Feb 2026 |
| Mustang Energy Corporation | Kansas | 6,617 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Mustang Holding, LLC (Finnex) | Alaska | 20,404 BBLs | 25,293 MCF | Dec 2024 - Feb 2026 |
| Muzyl Oil Corp | Michigan | 0 BBLs | 154,358 MCF | Nov 2016 - Mar 2026 |
| MWK Petroleum, LLC | Kansas | 2,316 BBLs | 0 MCF | Jan 2020 - Jan 2026 |
| Nadel And Gussman LLC | Kansas | 2,266 BBLs | 3,209 MCF | Jan 1980 - Jan 2026 |
| Nadel And Gussman Ruston, LLC | Louisiana | 7,961 BBLs | 1,173,013 MCF | Mar 2012 - Dec 2024 |
| Natural Gas Processing Company | Wyoming | 1,121 BBLs | 8,903 MCF | Feb 1978 - Mar 2026 |
| Navigation Powder River LLC | Wyoming | 13,272 BBLs | 54,463 MCF | Dec 2016 - Feb 2026 |
| Nec Operating - Kansas, LLC | Kansas | 1,753 BBLs | 2,699 MCF | Jan 2020 - Jan 2026 |
| Neptune Operating LLC | North Dakota | 627,940 BBLs | 1,605,730 MCF | Jan 2023 - Mar 2026 |
| New Age Oil LLC | Kansas | 1,764 BBLs | 0 MCF | Feb 1982 - Jan 2026 |
| New Era Petroleum Inc | Wyoming | 1,808 BBLs | 0 MCF | Feb 2010 - Feb 2026 |
| New Horizon Resources LLC | Montana | 7,108 BBLs | 468 MCF | Feb 2022 - Feb 2026 |
| New Millennium Resources, Inc. | North Dakota | 983 BBLs | 62 MCF | Apr 2002 - Mar 2026 |
| Nnogc Exploration & Production, LLC | Utah | 10,405 BBLs | 24,506 MCF | Nov 2012 - Mar 2026 |
| Noble Energy Inc | Colorado | 2,352,154 BBLs | 18,562,580 MCF | Jan 1999 - Feb 2026 |
| Norstar Petroleum, Inc. | Kansas | 1,845 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| North Fork Operating, LP | New Mexico | 3,168 BBLs | 61,923 MCF | Jan 2020 - Feb 2026 |
| North Shore Exploration & Prod LLC | Wyoming | 3,165 BBLs | 165,429 MCF | May 2015 - Feb 2026 |
| North Silo Resources LLC | Wyoming | 97,638 BBLs | 167,396 MCF | Sep 2019 - Mar 2026 |
| North Slope Borough | Alaska | 0 BBLs | 155,984 MCF | Sep 1950 - Feb 2026 |
| Northern Lights Oil Company, LLC | Kansas | 1,273 BBLs | 453 MCF | Jan 1980 - Jan 2026 |
| Northern Oil Production, Inc. | Montana | 4,588 BBLs | 1,558 MCF | May 1992 - Feb 2026 |
| Northwestern Corporation | Montana | 307 BBLs | 314,237 MCF | Apr 2004 - Mar 2026 |
| Novo Oil & Gas Northern Delaware, LLC | New Mexico | 509,896 BBLs | 4,360,240 MCF | Feb 2018 - Feb 2026 |
| NRD - Rein Resources, A General Partnership | Kansas | 1,137 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Nuevida Resources LLC | Colorado | 0 BBLs | 783,004 MCF | Jul 2023 - Feb 2026 |
| O'Brien Energy Resources Corp. | Kansas | 1,129 BBLs | 28,570 MCF | May 2008 - Jan 2026 |
| Oasis Petroleum North America LLC | Montana | 58,282 BBLs | 62,147 MCF | Mar 2007 - Feb 2026 |
| Oasis Petroleum North America LLC | North Dakota | 2,195,733 BBLs | 6,647,329 MCF | May 2007 - Mar 2026 |
| Occidental Permian LTD | New Mexico | 401,852 BBLs | 786,289 MCF | Mar 1997 - Mar 2026 |
| Ogris Operating LLC | Colorado | 0 BBLs | 557,962 MCF | Jan 1999 - Feb 2026 |