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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Merrion Oil & Gas Corp | New Mexico | 865 BBLs | 83,360 MCF | Jan 1993 - Aug 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,259 BBLs | 8,562 MCF | Jan 1978 - Jul 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,373 BBLs | 42,130 MCF | Jan 1980 - Jun 2026 |
| Messer LLC | Colorado | 0 BBLs | 113,445 MCF | Jan 1999 - Aug 2026 |
| Mewbourne Oil Co | New Mexico | 8,795,783 BBLs | 39,070,524 MCF | Jan 1993 - Jul 2026 |
| Mi3 Energy LLC | Wyoming | 20,162 BBLs | 4,943 MCF | Nov 2025 - Aug 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,389 BBLs | 0 MCF | Jan 1980 - Jun 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,854 BBLs | 1,659 MCF | Feb 2017 - Aug 2026 |
| Mid-Continent Resources, Inc. | Kansas | 1,627 BBLs | 0 MCF | Jan 1980 - Jun 2026 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Midway Energy, LLC | Montana | 1,812 BBLs | 0 MCF | Mar 2019 - Jul 2026 |
| Mike Kelso Oil, Inc. | Kansas | 12,698 BBLs | 122,190 MCF | Jan 1980 - Jun 2026 |
| Mikol Oil LLC | Kansas | 1,136 BBLs | 0 MCF | Feb 2009 - Jun 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |
| Missouri River Resources ND, LLC | North Dakota | 5,259 BBLs | 28,971 MCF | Nov 2014 - Jul 2026 |
| Mobil Oil Exploration & Producing Southeast, Inc. | Alabama | 0 BBLs | 578,048 MCF | Aug 1976 - Jul 2026 |
| Mogo Reagan, LLC | Montana | 3,443 BBLs | 9,208 MCF | Nov 2019 - Jul 2026 |
| Molitor Oil, Inc. | Kansas | 954 BBLs | 3,348 MCF | Jan 1980 - Jun 2026 |
| Moncrief W A Jr | Wyoming | 537 BBLs | 21,340 MCF | Jan 1978 - Aug 2026 |
| Montalban Oil & Gas Operations, Inc. | Montana | 2,368 BBLs | 68,439 MCF | Jan 1991 - Jul 2026 |
| Morgenstern Oil Operations LLC | Kansas | 1,766 BBLs | 0 MCF | Jan 2020 - Jun 2026 |
| Morningstar Operating LLC | Colorado | 0 BBLs | 178,774 MCF | Jun 2001 - Jul 2026 |
| Morningstar Operating LLC | Montana | 268,066 BBLs | 437,329 MCF | Jan 2024 - Jul 2026 |
| Morningstar Operating LLC | New Mexico | 109,286 BBLs | 3,328,828 MCF | Sep 2020 - Jul 2026 |
| Morningstar Operating LLC | North Dakota | 36,300 BBLs | 37,298 MCF | Oct 2024 - Jul 2026 |
| Mosbacher Energy Company | Mississippi | 13,154 BBLs | 6,810 MCF | Dec 1976 - Aug 2026 |
| Mr NM Operating LLC | New Mexico | 7,660 BBLs | 44,143 MCF | Mar 2021 - Aug 2026 |
| MTM Petroleum, Inc. | Kansas | 1,014 BBLs | 20,977 MCF | Jan 1980 - Jun 2026 |
| Mull Drilling Company Inc | Colorado | 22,178 BBLs | 177,134 MCF | Jan 1999 - Jul 2026 |
| Mull Drilling Company, Inc. | Kansas | 16,617 BBLs | 9,052 MCF | Jan 1980 - Jun 2026 |
| Mulloy Operating, Inc. | New Mexico | 5,410 BBLs | 5,728 MCF | Jul 2006 - Jul 2026 |
| Murex Petroleum Corporation | North Dakota | 157,385 BBLs | 441,196 MCF | Apr 2001 - Jul 2026 |
| Murfin Drilling Co., Inc. | Kansas | 77,266 BBLs | 1,658 MCF | Jan 1980 - Jun 2026 |
| Murfin Drilling Company, Inc. | North Dakota | 26,313 BBLs | 15,501 MCF | Feb 2025 - Jul 2026 |
| Murphrey Oil Company, Inc. | Louisiana | 3,563 BBLs | 0 MCF | Feb 2020 - Jan 2025 |
| Mustang Energy Corporation | Kansas | 7,914 BBLs | 0 MCF | Jan 1980 - Jun 2026 |
| Mustang Holding, LLC (Finnex) | Alaska | 20,404 BBLs | 25,293 MCF | Dec 2024 - Feb 2026 |
| Mustang Resources LLC | New Mexico | 38 BBLs | 84,293 MCF | Sep 2018 - Jul 2026 |
| Mustang Resources LLC | Wyoming | 439 BBLs | 147,315 MCF | Nov 2014 - Aug 2026 |
| MWK Petroleum, LLC | Kansas | 2,207 BBLs | 0 MCF | Jan 2020 - Jun 2026 |
| Nadel And Gussman LLC | Kansas | 1,644 BBLs | 2,733 MCF | Jan 1980 - Jun 2026 |
| Nadel And Gussman Ruston, LLC | Louisiana | 7,961 BBLs | 1,173,013 MCF | Mar 2012 - Dec 2024 |
| Natural Gas Processing Company | Wyoming | 2,086 BBLs | 6,383 MCF | Feb 1978 - Aug 2026 |
| Navigation Powder River LLC | Wyoming | 13,023 BBLs | 64,158 MCF | Dec 2016 - Aug 2026 |
| Nec Operating - Kansas, LLC | Kansas | 1,448 BBLs | 4,102 MCF | Jan 2020 - Jun 2026 |
| Neptune Operating LLC | North Dakota | 509,427 BBLs | 1,447,253 MCF | Jan 2023 - Jul 2026 |
| New Age Oil LLC | Kansas | 1,661 BBLs | 0 MCF | Feb 1982 - Jun 2026 |
| New Era Petroleum Inc | Wyoming | 980 BBLs | 0 MCF | Feb 2010 - Aug 2026 |
| New Horizon Resources LLC | Kansas | 1,134 BBLs | 0 MCF | Jan 2020 - Jun 2026 |
| Nnogc Exploration & Production, LLC | Utah | 10,691 BBLs | 27,117 MCF | Nov 2012 - Aug 2026 |