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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| M G Oil Inc | Kansas | 9,030 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Mack Energy Corp | New Mexico | 135,584 BBLs | 353,807 MCF | Jan 1993 - Mar 2026 |
| Mad Operators LLC | Kansas | 13,913 BBLs | 523 MCF | Jan 2020 - Jan 2026 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 14,909 BBLs | 110,579 MCF | Jan 1999 - Feb 2026 |
| Mai Oil Operations, Inc. | Kansas | 47,804 BBLs | 349 MCF | Jan 1980 - Jan 2026 |
| Manzanita Operating, LLC | New Mexico | 5,366 BBLs | 0 MCF | Apr 2022 - Mar 2026 |
| Manzano LLC | New Mexico | 6,400 BBLs | 12,284 MCF | Mar 2005 - Mar 2026 |
| Mar-Lou Oil Co., LLC | Kansas | 1,143 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 145,119 MCF | Jan 1999 - Feb 2026 |
| Marathon Oil Company | North Dakota | 1,817,531 BBLs | 4,140,338 MCF | Jul 1979 - Mar 2026 |
| Marathon Oil Permian LLC | New Mexico | 703,200 BBLs | 2,793,317 MCF | Jul 2017 - Mar 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 27,435 BBLs | 42,477 MCF | Jan 2022 - Mar 2026 |
| Marlin Resources, L.L.C. | Louisiana | 2,463 BBLs | 0 MCF | Apr 2008 - Jan 2025 |
| Marlo Operating Company, LLC | North Dakota | 2,121 BBLs | 230 MCF | Nov 2025 - Mar 2026 |
| Marquee Corporation | Louisiana | 1,825 BBLs | 268 MCF | Jun 1990 - Dec 2024 |
| Marshall & Winston Inc | New Mexico | 59,722 BBLs | 135,105 MCF | Jan 1993 - Mar 2026 |
| Matador Production Company | New Mexico | 5,061,531 BBLs | 20,269,549 MCF | Mar 2006 - Mar 2026 |
| Matrix Production Company | Wyoming | 25,363 BBLs | 18,266 MCF | Jan 1994 - Mar 2026 |
| Maverick Permian LLC | New Mexico | 121,850 BBLs | 116,905 MCF | Jul 2022 - Mar 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 1,883 BBLs | 17,216 MCF | Jun 1982 - Mar 2026 |
| Maximus Operating LTD | Wyoming | 13,002 BBLs | 971 MCF | Jul 2014 - Mar 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 | 29,549 BBLs | 29,088 MCF | Jan 1980 - Jan 2026 |
| McFadden Oil Co. | Kansas | 3,041 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| McGinness Energy Company, Inc. | Kansas | 1,931 BBLs | 38,306 MCF | Jan 2020 - Jan 2026 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MDS Energy Development LLC | Colorado | 8,811 BBLs | 12,326 MCF | Nov 2022 - Feb 2026 |
| MDS Energy Development LLC | Wyoming | 20,804 BBLs | 35,070 MCF | Jan 2025 - Mar 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,346 BBLs | 18,728 MCF | Jan 1993 - Mar 2026 |
| Meadow Deep LLC | Wyoming | 190 BBLs | 37,595 MCF | Mar 2010 - Mar 2026 |
| Medora Minerals, LLC | North Dakota | 6,667 BBLs | 49 MCF | Nov 2018 - Mar 2026 |
| Mercury Resources LLC | North Dakota | 12,771 BBLs | 28,986 MCF | Dec 2018 - Mar 2026 |
| Meridian Energy Inc. | Kansas | 4,171 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Merit Energy Company | Wyoming | 402,867 BBLs | 205,197 MCF | Jan 1981 - Mar 2026 |
| Merit Energy Company, LLC | Kansas | 155,416 BBLs | 1,788,532 MCF | Jan 1980 - Jan 2026 |
| Merrion Oil & Gas Corp | New Mexico | 818 BBLs | 98,139 MCF | Jan 1993 - Mar 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,450 BBLs | 40,829 MCF | Jan 1980 - Jan 2026 |
| Mewbourne Oil Co | New Mexico | 8,082,740 BBLs | 29,180,379 MCF | Jan 1993 - Mar 2026 |
| Mi3 Energy LLC | Wyoming | 19,259 BBLs | 5,458 MCF | Nov 2025 - Mar 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,444 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,653 BBLs | 1,373 MCF | Feb 2017 - Mar 2026 |
| Mid-Continent Resources, Inc. | Kansas | 1,271 BBLs | 0 MCF | Jan 1980 - Jan 2026 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Mike Kelso Oil, Inc. | Kansas | 10,148 BBLs | 95,697 MCF | Jan 1980 - Jan 2026 |
| Mikol Oil LLC | Kansas | 1,309 BBLs | 0 MCF | Feb 2009 - Jan 2026 |
| Miller Energy Company II LLC | Michigan | 14,829 BBLs | 0 MCF | Jan 1982 - Mar 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |