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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| M G Oil Inc | Kansas | 7,653 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Mack Energy Corp | New Mexico | 125,560 BBLs | 313,813 MCF | Jan 1993 - Feb 2026 |
| Mad Operators LLC | Kansas | 10,307 BBLs | 523 MCF | Jan 2020 - Dec 2025 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 17,662 BBLs | 123,170 MCF | Jan 1999 - Jan 2026 |
| Mai Oil Operations, Inc. | Kansas | 39,853 BBLs | 350 MCF | Jan 1980 - Dec 2025 |
| Manzanita Operating, LLC | New Mexico | 4,818 BBLs | 0 MCF | Apr 2022 - Feb 2026 |
| Manzano LLC | New Mexico | 6,790 BBLs | 13,687 MCF | Mar 2005 - Feb 2026 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 172,498 MCF | Jan 1999 - Jan 2026 |
| Marathon Oil Company | North Dakota | 1,705,908 BBLs | 3,704,666 MCF | Jul 1979 - Feb 2026 |
| Marathon Oil Permian LLC | New Mexico | 627,036 BBLs | 2,455,586 MCF | Jul 2017 - Feb 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 27,926 BBLs | 43,235 MCF | Jan 2022 - Feb 2026 |
| Marlin Resources, L.L.C. | Louisiana | 2,463 BBLs | 0 MCF | Apr 2008 - Jan 2025 |
| Marlo Operating Company, LLC | North Dakota | 2,268 BBLs | 1,620 MCF | Nov 2025 - Mar 2026 |
| Marquee Corporation | Louisiana | 1,825 BBLs | 268 MCF | Jun 1990 - Dec 2024 |
| Marshall & Winston Inc | New Mexico | 56,771 BBLs | 112,589 MCF | Jan 1993 - Feb 2026 |
| Matador Production Company | New Mexico | 4,056,731 BBLs | 17,568,287 MCF | Mar 2006 - Feb 2026 |
| Matrix Production Company | Wyoming | 24,073 BBLs | 15,190 MCF | Jan 1994 - Feb 2026 |
| Maverick Permian LLC | New Mexico | 103,960 BBLs | 100,444 MCF | Jul 2022 - Feb 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 2,054 BBLs | 17,879 MCF | Jun 1982 - Jan 2026 |
| Maximus Operating LTD | Wyoming | 13,891 BBLs | 633 MCF | Jul 2014 - Feb 2026 |
| Maximus Operating, LTD. | Louisiana | 526 BBLs | 36,971 MCF | Jan 2006 - Jan 2025 |
| McCormick Production Company, Inc. | Louisiana | 4,393 BBLs | 0 MCF | Jan 2009 - Dec 2024 |
| McCoy Petroleum Corporation | Kansas | 26,229 BBLs | 32,044 MCF | Jan 1980 - Dec 2025 |
| McFadden Oil Co. | Kansas | 3,401 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| McGinness Energy Company, Inc. | Kansas | 2,031 BBLs | 38,342 MCF | Jan 2020 - Dec 2025 |
| McGowan Working Partners Inc. | Mississippi | 1,107 BBLs | 1,220 MCF | Dec 1976 - Jan 2026 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MDS Energy Development LLC | Colorado | 9,446 BBLs | 12,513 MCF | Nov 2022 - Jan 2026 |
| MDS Energy Development LLC | Wyoming | 23,348 BBLs | 42,967 MCF | Jan 2025 - Feb 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,247 BBLs | 16,629 MCF | Jan 1993 - Mar 2026 |
| Medora Minerals, LLC | North Dakota | 6,033 BBLs | 30 MCF | Nov 2018 - Feb 2026 |
| Mercury Resources LLC | North Dakota | 11,555 BBLs | 23,570 MCF | Dec 2018 - Feb 2026 |
| Meridian Energy Inc. | Kansas | 4,320 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Merit Energy Company | Wyoming | 400,294 BBLs | 206,473 MCF | Jan 1981 - Feb 2026 |
| Merit Energy Company, LLC | Kansas | 155,945 BBLs | 1,758,244 MCF | Jan 1980 - Dec 2025 |
| Merrion Oil & Gas Corp | New Mexico | 990 BBLs | 95,351 MCF | Jan 1993 - Feb 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,302 BBLs | 60,130 MCF | Jan 1978 - Feb 2026 |
| Messenger Petroleum, Inc. | Kansas | 2,019 BBLs | 44,437 MCF | Jan 1980 - Dec 2025 |
| Messer LLC | Colorado | 0 BBLs | 73,807 MCF | Jan 1999 - Jan 2026 |
| Mewbourne Oil Co | New Mexico | 7,430,511 BBLs | 25,980,713 MCF | Jan 1993 - Feb 2026 |
| Mi3 Energy LLC | Wyoming | 18,502 BBLs | 4,377 MCF | Oct 2025 - Feb 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,307 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Mid-Con Energy Operating LLC | Wyoming | 7,108 BBLs | 1,990 MCF | Feb 2017 - Feb 2026 |
| Mid-Continent Resources, Inc. | Kansas | 2,353 BBLs | 0 MCF | Jan 1980 - Dec 2025 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Mike Kelso Oil, Inc. | Kansas | 7,868 BBLs | 86,546 MCF | Jan 1980 - Dec 2025 |
| Miller Energy Company II LLC | Michigan | 13,688 BBLs | 0 MCF | Jan 1982 - Feb 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |