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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mack Energy Corp | New Mexico | 167,055 BBLs | 361,949 MCF | Jan 1993 - Jan 2026 |
| Mad Operators LLC | Kansas | 7,609 BBLs | 493 MCF | Jan 2020 - Sep 2025 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 18,609 BBLs | 124,279 MCF | Jan 1999 - Dec 2025 |
| Mai Oil Operations, Inc. | Kansas | 45,275 BBLs | 3,676 MCF | Jan 1980 - Sep 2025 |
| Manzanita Operating, LLC | New Mexico | 5,258 BBLs | 0 MCF | Apr 2022 - Jan 2026 |
| Manzano LLC | New Mexico | 8,071 BBLs | 15,231 MCF | Mar 2005 - Dec 2025 |
| Mar-Lou Oil Co., LLC | Kansas | 2,130 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 226,976 MCF | Jan 1999 - Dec 2025 |
| Marathon Oil Company | North Dakota | 1,884,649 BBLs | 3,991,573 MCF | Jul 1979 - Jan 2026 |
| Marathon Oil Permian LLC | New Mexico | 791,310 BBLs | 3,262,114 MCF | Jul 2017 - Jan 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 33,647 BBLs | 45,068 MCF | Jan 2022 - Dec 2025 |
| Marlin Resources, L.L.C. | Louisiana | 2,463 BBLs | 0 MCF | Apr 2008 - Jan 2025 |
| Marquee Corporation | Louisiana | 1,825 BBLs | 268 MCF | Jun 1990 - Dec 2024 |
| Marshall & Winston Inc | New Mexico | 55,608 BBLs | 124,500 MCF | Jan 1993 - Jan 2026 |
| Matador Production Company | New Mexico | 4,753,551 BBLs | 20,250,631 MCF | Mar 2006 - Dec 2025 |
| Matrix Production Company | Wyoming | 27,875 BBLs | 24,660 MCF | Jan 1994 - Nov 2025 |
| Maverick Permian LLC | New Mexico | 125,374 BBLs | 122,638 MCF | Jul 2022 - Jan 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 2,045 BBLs | 14,693 MCF | Jun 1982 - Jan 2026 |
| Maximus Operating LTD | Wyoming | 12,552 BBLs | 1,225 MCF | Jul 2014 - Jan 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 | 29,593 BBLs | 25,451 MCF | Jan 1980 - Sep 2025 |
| McFadden Oil Co. | Kansas | 3,236 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| McGinness Energy Company, Inc. | Kansas | 2,238 BBLs | 39,020 MCF | Jan 2020 - Sep 2025 |
| McGowan Working Partners Inc. | Mississippi | 1,785 BBLs | 3,090 MCF | Dec 1976 - Nov 2025 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MDS Energy Development LLC | Colorado | 9,632 BBLs | 12,825 MCF | Nov 2022 - Dec 2025 |
| MDS Energy Development LLC | Wyoming | 16,894 BBLs | 25,129 MCF | Jan 2025 - Jan 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,578 BBLs | 21,886 MCF | Jan 1993 - Jan 2026 |
| Medora Minerals, LLC | North Dakota | 6,579 BBLs | 41 MCF | Nov 2018 - Jan 2026 |
| Mega Energy LLC | Wyoming | 0 BBLs | 30,417 MCF | May 2013 - Jan 2026 |
| Mercury Resources LLC | North Dakota | 11,044 BBLs | 19,347 MCF | Dec 2018 - Jan 2026 |
| Meridian Energy Inc. | Kansas | 4,450 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Merit Energy Company | Wyoming | 391,990 BBLs | 205,099 MCF | Jan 1981 - Jan 2026 |
| Merit Energy Company, LLC | Kansas | 181,214 BBLs | 1,857,616 MCF | Jan 1980 - Sep 2025 |
| Merrion Oil & Gas Corp | New Mexico | 964 BBLs | 102,025 MCF | Jan 1993 - Jan 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,367 BBLs | 52,193 MCF | Jan 1978 - Jan 2026 |
| Messenger Petroleum, Inc. | Kansas | 2,311 BBLs | 43,206 MCF | Jan 1980 - Sep 2025 |
| Messer LLC | Colorado | 0 BBLs | 108,580 MCF | Jan 1999 - Jan 2026 |
| Mewbourne Oil Co | New Mexico | 7,681,813 BBLs | 25,950,052 MCF | Jan 1993 - Dec 2025 |
| Mi3 Energy LLC | Wyoming | 16,954 BBLs | 3,901 MCF | Oct 2025 - Jan 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,254 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Mid-Con Energy Operating LLC | Wyoming | 7,135 BBLs | 2,260 MCF | Feb 2017 - Jan 2026 |
| Mid-Continent Resources, Inc. | Kansas | 1,714 BBLs | 0 MCF | Jan 1980 - Sep 2025 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Mike Kelso Oil, Inc. | Kansas | 8,173 BBLs | 72,014 MCF | Jan 1980 - Sep 2025 |
| Miller Energy Company II LLC | Michigan | 15,314 BBLs | 0 MCF | Jan 1982 - Jan 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |