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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Moncrief W A Jr | Wyoming | 482 BBLs | 20,906 MCF | Jan 1978 - Jan 2026 |
| Montalban Oil & Gas Operations, Inc. | Montana | 3,047 BBLs | 65,732 MCF | Jan 1991 - Jan 2026 |
| Morgenstern Oil Operations LLC | Kansas | 1,943 BBLs | 0 MCF | Jan 2020 - Dec 2025 |
| Morningstar Operating LLC | Montana | 366,839 BBLs | 479,506 MCF | Jan 2024 - Jan 2026 |
| Morningstar Operating LLC | New Mexico | 113,665 BBLs | 3,214,943 MCF | Sep 2020 - Jan 2026 |
| Morningstar Operating LLC | North Dakota | 26,984 BBLs | 32,986 MCF | Oct 2024 - Feb 2026 |
| Mr NM Operating LLC | New Mexico | 7,314 BBLs | 46,657 MCF | Mar 2021 - Jan 2026 |
| MTM Petroleum, Inc. | Kansas | 824 BBLs | 20,606 MCF | Jan 1980 - Dec 2025 |
| Mull Drilling Company Inc | Colorado | 21,576 BBLs | 157,975 MCF | Jan 1999 - Jan 2026 |
| Mull Drilling Company, Inc. | Kansas | 15,204 BBLs | 11,496 MCF | Jan 1980 - Dec 2025 |
| Murex Petroleum Corporation | North Dakota | 171,739 BBLs | 463,646 MCF | Apr 2001 - Feb 2026 |
| Murfin Drilling Co., Inc. | Kansas | 68,620 BBLs | 1,097 MCF | Jan 1980 - Dec 2025 |
| Murfin Drilling Company, Inc. | North Dakota | 7,800 BBLs | 5,274 MCF | Mar 2025 - Feb 2026 |
| Murphrey Oil Company, Inc. | Louisiana | 3,563 BBLs | 0 MCF | Feb 2020 - Jan 2025 |
| Muskegon Operating Company LLC | Michigan | 26,525 BBLs | 351,003 MCF | Jan 2021 - Aug 2025 |
| Mustang Energy Corporation | Kansas | 3,759 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Mustang Holding, LLC (Finnex) | Alaska | 22,494 BBLs | 27,199 MCF | Dec 2024 - Feb 2026 |
| Mustang Resources LLC | New Mexico | 0 BBLs | 99,776 MCF | Sep 2018 - Jan 2026 |
| Mustang Resources LLC | Wyoming | 694 BBLs | 167,393 MCF | Nov 2014 - Jan 2026 |
| Muzyl Oil Corp | Michigan | 52 BBLs | 183,584 MCF | Nov 2016 - Sep 2025 |
| MWK Petroleum, LLC | Kansas | 2,480 BBLs | 0 MCF | Jan 2020 - Dec 2025 |
| N.F. Producers, Inc. | Kansas | 982 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Nadel And Gussman LLC | Kansas | 1,644 BBLs | 3,100 MCF | Jan 1980 - Dec 2025 |
| Nadel And Gussman Ruston, LLC | Louisiana | 7,961 BBLs | 1,173,013 MCF | Mar 2012 - Dec 2024 |
| Natural Gas Processing Company | Wyoming | 1,029 BBLs | 9,860 MCF | Feb 1978 - Feb 2026 |
| Navigation Powder River LLC | Wyoming | 16,558 BBLs | 67,708 MCF | Dec 2016 - Feb 2026 |
| Nec Operating - Kansas, LLC | Kansas | 1,295 BBLs | 2,606 MCF | Jan 2020 - Dec 2025 |
| Neptune Operating LLC | North Dakota | 553,842 BBLs | 1,417,362 MCF | Jan 2023 - Feb 2026 |
| New Age Oil LLC | Kansas | 2,434 BBLs | 84 MCF | Feb 1982 - Dec 2025 |
| New Era Petroleum Inc | Wyoming | 2,025 BBLs | 0 MCF | Feb 2010 - Feb 2026 |
| New Horizon Resources LLC | Montana | 8,005 BBLs | 672 MCF | Feb 2022 - Feb 2026 |
| Nnogc Exploration & Production, LLC | Utah | 12,677 BBLs | 27,895 MCF | Nov 2012 - Feb 2026 |
| Noble Energy Inc | Colorado | 2,542,240 BBLs | 19,743,741 MCF | Jan 1999 - Jan 2026 |
| Norstar Petroleum, Inc. | Kansas | 2,115 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| North Fork Operating, LP | New Mexico | 2,930 BBLs | 70,238 MCF | Jan 2020 - Jan 2026 |
| North Shore Exploration & Prod LLC | Wyoming | 7,873 BBLs | 210,402 MCF | May 2015 - Jan 2026 |
| North Shore Exploration & Production, LLC | Utah | 181 BBLs | 33,679 MCF | Oct 2019 - Feb 2026 |
| North Silo Resources LLC | Wyoming | 113,459 BBLs | 192,284 MCF | Sep 2019 - Jan 2026 |
| North Slope Borough | Alaska | 0 BBLs | 168,893 MCF | Sep 1950 - Feb 2026 |
| Northern Lights Oil Company, LLC | Kansas | 1,130 BBLs | 526 MCF | Jan 1980 - Dec 2025 |
| Northern Oil Production, Inc. | Montana | 6,708 BBLs | 2,232 MCF | May 1992 - Jan 2026 |
| Northwestern Corporation | Montana | 428 BBLs | 341,551 MCF | Apr 2004 - Jan 2026 |
| Novo Oil & Gas Northern Delaware, LLC | New Mexico | 326,868 BBLs | 3,546,421 MCF | Feb 2018 - Jan 2026 |
| Nuenergy LLC | Michigan | 1,357 BBLs | 75,556 MCF | Jul 2001 - Aug 2025 |
| Nuevida Resources LLC | Colorado | 0 BBLs | 959,036 MCF | Jul 2023 - Jan 2026 |
| O'Brien Energy Resources Corp. | Kansas | 997 BBLs | 28,610 MCF | May 2008 - Dec 2025 |
| Oasis Petroleum North America LLC | Montana | 67,524 BBLs | 62,956 MCF | Mar 2007 - Jan 2026 |
| Oasis Petroleum North America LLC | North Dakota | 1,966,570 BBLs | 5,934,052 MCF | May 2007 - Feb 2026 |
| Occidental Permian LTD | New Mexico | 384,735 BBLs | 746,075 MCF | Mar 1997 - Jan 2026 |
| Ogris Operating LLC | Colorado | 0 BBLs | 612,246 MCF | Jan 1999 - Jan 2026 |