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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 - Jul 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,248 BBLs | 8,084 MCF | Jan 1978 - Jul 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,682 BBLs | 39,827 MCF | Jan 1980 - May 2026 |
| Messer LLC | Colorado | 0 BBLs | 113,445 MCF | Jan 1999 - Jul 2026 |
| Mewbourne Oil Co | New Mexico | 8,795,783 BBLs | 39,070,524 MCF | Jan 1993 - Jul 2026 |
| Mi3 Energy LLC | Wyoming | 20,358 BBLs | 4,965 MCF | Nov 2025 - Jul 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,471 BBLs | 0 MCF | Jan 1980 - May 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,284 BBLs | 1,460 MCF | Feb 2017 - Jul 2026 |
| Mid-Continent Resources, Inc. | Kansas | 1,256 BBLs | 0 MCF | Jan 1980 - May 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 | 14,196 BBLs | 103,812 MCF | Jan 1980 - May 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 | 507,209 MCF | Aug 1976 - Jun 2026 |
| Mogo Reagan, LLC | Montana | 3,443 BBLs | 9,208 MCF | Nov 2019 - Jul 2026 |
| Moncrief W A Jr | Wyoming | 692 BBLs | 21,374 MCF | Jan 1978 - Jul 2026 |
| Montalban Oil & Gas Operations, Inc. | Montana | 2,368 BBLs | 68,439 MCF | Jan 1991 - Jul 2026 |
| Morgenstern Oil Operations LLC | Kansas | 1,633 BBLs | 0 MCF | Jan 2020 - May 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 | 12,632 BBLs | 7,014 MCF | Dec 1976 - Jul 2026 |
| Mr NM Operating LLC | New Mexico | 7,660 BBLs | 44,143 MCF | Mar 2021 - Jul 2026 |
| MS United, LLC | Mississippi | 941 BBLs | 0 MCF | Jan 2023 - Jun 2026 |
| MTM Petroleum, Inc. | Kansas | 312 BBLs | 19,962 MCF | Jan 1980 - May 2026 |
| Mull Drilling Company Inc | Colorado | 22,105 BBLs | 175,437 MCF | Jan 1999 - Jul 2026 |
| Mull Drilling Company, Inc. | Kansas | 14,959 BBLs | 9,068 MCF | Jan 1980 - May 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 | 75,583 BBLs | 1,488 MCF | Jan 1980 - May 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 | 7,536 BBLs | 0 MCF | Jan 1980 - May 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 | 619 BBLs | 135,849 MCF | Nov 2014 - Jul 2026 |
| MWK Petroleum, LLC | Kansas | 2,270 BBLs | 0 MCF | Jan 2020 - May 2026 |
| Nadel And Gussman LLC | Kansas | 1,958 BBLs | 2,001 MCF | Jan 1980 - May 2026 |
| Nadel And Gussman Ruston, LLC | Louisiana | 7,961 BBLs | 1,173,013 MCF | Mar 2012 - Dec 2024 |
| Natural Gas Processing Company | Wyoming | 2,068 BBLs | 11,692 MCF | Feb 1978 - Jul 2026 |
| Navigation Powder River LLC | Wyoming | 14,133 BBLs | 64,014 MCF | Dec 2016 - Jul 2026 |
| Nec Operating - Kansas, LLC | Kansas | 1,110 BBLs | 4,348 MCF | Jan 2020 - May 2026 |
| Neptune Operating LLC | North Dakota | 509,427 BBLs | 1,447,253 MCF | Jan 2023 - Jul 2026 |
| New Age Oil LLC | Kansas | 2,152 BBLs | 0 MCF | Feb 1982 - May 2026 |
| New Era Petroleum Inc | Wyoming | 980 BBLs | 0 MCF | Feb 2010 - Jul 2026 |
| Nnogc Exploration & Production, LLC | Utah | 10,691 BBLs | 27,117 MCF | Nov 2012 - Jul 2026 |
| Noble Energy Inc | Colorado | 2,856,906 BBLs | 20,275,504 MCF | Jan 1999 - Jul 2026 |
| Norstar Petroleum, Inc. | Kansas | 1,907 BBLs | 0 MCF | Jan 1980 - May 2026 |