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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mogo Reagan, LLC | Montana | 3,559 BBLs | 10,871 MCF | Nov 2019 - Jan 2026 |
| 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 |
| Montex Drilling Company LLC | Wyoming | 835 BBLs | 4,258 MCF | Feb 2025 - Jan 2026 |
| Morgenstern Oil Operations LLC | Kansas | 1,624 BBLs | 0 MCF | Jan 2020 - Sep 2025 |
| Morningstar Operating LLC | Colorado | 0 BBLs | 149,227 MCF | Jun 2001 - 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 | 40,589 BBLs | 50,414 MCF | Oct 2024 - Jan 2026 |
| Mosbacher Energy Company | Mississippi | 15,237 BBLs | 6,932 MCF | Dec 1976 - Nov 2025 |
| Mr NM Operating LLC | New Mexico | 7,314 BBLs | 46,657 MCF | Mar 2021 - Jan 2026 |
| MTM Petroleum, Inc. | Kansas | 328 BBLs | 22,012 MCF | Jan 1980 - Sep 2025 |
| Mull Drilling Company Inc | Colorado | 22,192 BBLs | 162,652 MCF | Jan 1999 - Dec 2025 |
| Mull Drilling Company, Inc. | Kansas | 19,414 BBLs | 21,345 MCF | Jan 1980 - Sep 2025 |
| Murex Petroleum Corporation | North Dakota | 190,553 BBLs | 522,834 MCF | Apr 2001 - Jan 2026 |
| Murfin Drilling Co., Inc. | Kansas | 77,721 BBLs | 1,173 MCF | Jan 1980 - Sep 2025 |
| Murfin Drilling Company, Inc. | North Dakota | 11,499 BBLs | 8,113 MCF | Mar 2025 - Jan 2026 |
| Murphrey Oil Company, Inc. | Louisiana | 3,563 BBLs | 0 MCF | Feb 2020 - Jan 2025 |
| Mustang Energy Corporation | Kansas | 2,898 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Mustang Holding, LLC (Finnex) | Alaska | 22,494 BBLs | 27,199 MCF | Dec 2024 - Jan 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 | 37 BBLs | 171,405 MCF | Nov 2016 - Jan 2026 |
| MWK Petroleum, LLC | Kansas | 1,400 BBLs | 0 MCF | Jan 2020 - Sep 2025 |
| N-10 Exploration, LLC | Kansas | 1,235 BBLs | 35,191 MCF | Jan 2010 - Sep 2025 |
| Nadel And Gussman LLC | Kansas | 1,779 BBLs | 3,024 MCF | Jan 1980 - Sep 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 - Jan 2026 |
| Navigation Powder River LLC | Wyoming | 16,558 BBLs | 67,708 MCF | Dec 2016 - Jan 2026 |
| Nec Operating - Kansas, LLC | Kansas | 1,118 BBLs | 3,007 MCF | Jan 2020 - Sep 2025 |
| Neptune Operating LLC | North Dakota | 655,370 BBLs | 1,622,037 MCF | Jan 2023 - Jan 2026 |
| New Age Oil LLC | Kansas | 2,714 BBLs | 83 MCF | Feb 1982 - Sep 2025 |
| New Era Petroleum Inc | Wyoming | 2,025 BBLs | 0 MCF | Feb 2010 - Jan 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 - Jan 2026 |
| Noble Energy Inc | Colorado | 2,573,118 BBLs | 20,261,701 MCF | Jan 1999 - Dec 2025 |
| Norstar Petroleum, Inc. | Kansas | 1,429 BBLs | 0 MCF | Jan 1980 - Sep 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 - Jan 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 - Jan 2026 |
| Northern Lights Oil Company, LLC | Kansas | 1,419 BBLs | 615 MCF | Jan 1980 - Sep 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 | 2,182 BBLs | 49,709 MCF | Jul 2001 - Dec 2025 |
| Nuevida Resources LLC | Colorado | 0 BBLs | 1,124,566 MCF | Jul 2023 - Dec 2025 |
| O'Brien Energy Resources Corp. | Kansas | 816 BBLs | 31,770 MCF | May 2008 - Sep 2025 |
| Oasis Petroleum North America LLC | Montana | 67,524 BBLs | 62,956 MCF | Mar 2007 - Jan 2026 |