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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| M & M Oil Company, L.L.C. | Louisiana | 2,996 BBLs | 0 MCF | Aug 1994 - Jan 2025 |
| M G Oil Inc | Kansas | 6,294 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Mack Energy Corp | New Mexico | 104,888 BBLs | 260,885 MCF | Jan 1993 - Apr 2026 |
| Mad Operators LLC | Kansas | 10,736 BBLs | 489 MCF | Jan 2020 - Feb 2026 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 16,387 BBLs | 121,940 MCF | Jan 1999 - Mar 2026 |
| Mai Oil Operations, Inc. | Kansas | 44,630 BBLs | 321 MCF | Jan 1980 - Feb 2026 |
| Manzano LLC | New Mexico | 6,677 BBLs | 12,329 MCF | Mar 2005 - Apr 2026 |
| Mar-Lou Oil Co., LLC | Kansas | 1,118 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 160,404 MCF | Jan 1999 - Mar 2026 |
| Marathon Oil Company | North Dakota | 1,826,611 BBLs | 4,434,498 MCF | Jul 1979 - May 2026 |
| Marathon Oil Permian LLC | New Mexico | 692,858 BBLs | 2,823,404 MCF | Jul 2017 - Apr 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 24,597 BBLs | 36,936 MCF | Jan 2022 - Apr 2026 |
| Marlin Resources, L.L.C. | Louisiana | 2,463 BBLs | 0 MCF | Apr 2008 - Jan 2025 |
| Marlo Operating Company, LLC | North Dakota | 1,959 BBLs | 150 MCF | Nov 2025 - Apr 2026 |
| Marquee Corporation | Louisiana | 1,825 BBLs | 268 MCF | Jun 1990 - Dec 2024 |
| Marshall & Winston Inc | New Mexico | 47,545 BBLs | 120,630 MCF | Jan 1993 - Apr 2026 |
| Matador Production Company | New Mexico | 4,747,058 BBLs | 18,515,853 MCF | Mar 2006 - Apr 2026 |
| Matrix Production Company | Wyoming | 26,175 BBLs | 23,184 MCF | Jan 1994 - Apr 2026 |
| Maverick Permian LLC | New Mexico | 123,148 BBLs | 112,339 MCF | Jul 2022 - Apr 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 1,813 BBLs | 17,287 MCF | Jun 1982 - Apr 2026 |
| Maximus Operating LTD | Wyoming | 10,532 BBLs | 1,170 MCF | Jul 2014 - Apr 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 | 29,175 BBLs | 29,992 MCF | Jan 1980 - Feb 2026 |
| McFadden Oil Co. | Kansas | 2,409 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| McGinness Energy Company, Inc. | Kansas | 1,566 BBLs | 27,336 MCF | Jan 2020 - Feb 2026 |
| McGowan Working Partners Inc. | Mississippi | 1,527 BBLs | 2,476 MCF | Dec 1976 - Apr 2026 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MCM Operating LLC | Wyoming | 1,100 BBLs | 1,299 MCF | Nov 2019 - Apr 2026 |
| McNeill Well Service LLC | Wyoming | 1,656 BBLs | 895 MCF | Jan 2026 - Apr 2026 |
| MDS Energy Development LLC | Colorado | 9,134 BBLs | 13,426 MCF | Nov 2022 - Apr 2026 |
| MDS Energy Development LLC | Wyoming | 20,623 BBLs | 30,733 MCF | Jan 2025 - Apr 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,085 BBLs | 19,912 MCF | Jan 1993 - May 2026 |
| Medora Minerals, LLC | North Dakota | 6,434 BBLs | 67 MCF | Nov 2018 - Apr 2026 |
| Mercury Resources LLC | North Dakota | 11,897 BBLs | 27,201 MCF | Dec 2018 - Apr 2026 |
| Meridian Energy Inc. | Kansas | 4,105 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Merit Energy Company | Wyoming | 390,468 BBLs | 208,316 MCF | Jan 1981 - Apr 2026 |
| Merit Energy Company, LLC | Kansas | 159,326 BBLs | 1,668,891 MCF | Jan 1980 - Feb 2026 |
| Merrion Oil & Gas Corp | New Mexico | 669 BBLs | 81,339 MCF | Jan 1993 - Apr 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,281 BBLs | 38,220 MCF | Jan 1980 - Feb 2026 |
| Messer LLC | Colorado | 0 BBLs | 104,050 MCF | Jan 1999 - Mar 2026 |
| Mewbourne Oil Co | New Mexico | 7,654,144 BBLs | 24,431,152 MCF | Jan 1993 - Apr 2026 |
| Mi3 Energy LLC | Wyoming | 18,905 BBLs | 4,363 MCF | Nov 2025 - May 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,624 BBLs | 0 MCF | Jan 1980 - Feb 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,282 BBLs | 1,000 MCF | Feb 2017 - Apr 2026 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Mike Kelso Oil, Inc. | Kansas | 10,266 BBLs | 97,855 MCF | Jan 1980 - Feb 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |