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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| M & K Oil Company LLC | Wyoming | 26,082 BBLs | 77,734 MCF | Jan 1978 - May 2026 |
| M & M Exploration, Inc. | Kansas | 961 BBLs | 16,383 MCF | Mar 2002 - Mar 2026 |
| M & M Oil Company, L.L.C. | Louisiana | 2,996 BBLs | 0 MCF | Aug 1994 - Jan 2025 |
| M G Oil Inc | Kansas | 7,291 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Mack Energy Corp | New Mexico | 137,594 BBLs | 366,212 MCF | Jan 1993 - May 2026 |
| Mad Operators LLC | Kansas | 10,441 BBLs | 474 MCF | Jan 2020 - Mar 2026 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 14,227 BBLs | 132,372 MCF | Jan 1999 - May 2026 |
| Mai Oil Operations, Inc. | Kansas | 45,734 BBLs | 7,258 MCF | Jan 1980 - Mar 2026 |
| Manning, Gregory | Kansas | 2,063 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Manzanita Operating, LLC | New Mexico | 6,395 BBLs | 0 MCF | Apr 2022 - May 2026 |
| Manzano LLC | New Mexico | 6,226 BBLs | 12,785 MCF | Mar 2005 - May 2026 |
| Mar-Lou Oil Co., LLC | Kansas | 956 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Marathon Oil Company | North Dakota | 1,661,969 BBLs | 4,393,999 MCF | Jul 1979 - May 2026 |
| Marathon Oil Permian LLC | New Mexico | 692,064 BBLs | 2,818,182 MCF | Jul 2017 - May 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Exploration, LLC | Mississippi | 1,138 BBLs | 0 MCF | Dec 1976 - May 2026 |
| Marlin Operating, LLC | New Mexico | 23,961 BBLs | 35,078 MCF | Jan 2022 - May 2026 |
| 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 | 42,782 BBLs | 117,529 MCF | Jan 1993 - May 2026 |
| Matador Production Company | New Mexico | 4,803,417 BBLs | 19,518,774 MCF | Mar 2006 - May 2026 |
| Matrix Production Company | Wyoming | 26,466 BBLs | 23,569 MCF | Jan 1994 - May 2026 |
| Maverick Permian LLC | New Mexico | 118,953 BBLs | 127,592 MCF | Jul 2022 - May 2026 |
| Maxcrude, LLC | Kansas | 971 BBLs | 0 MCF | Jan 2010 - Mar 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 1,381 BBLs | 18,024 MCF | Jun 1982 - May 2026 |
| Maximus Operating LTD | Wyoming | 10,618 BBLs | 310 MCF | Jul 2014 - Jun 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 | 25,772 BBLs | 14,851 MCF | Jan 1980 - Mar 2026 |
| McFadden Oil Co. | Kansas | 3,550 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| McGinness Energy Company, Inc. | Kansas | 1,283 BBLs | 30,527 MCF | Jan 2020 - Mar 2026 |
| McGowan Working Partners Inc. | Mississippi | 1,882 BBLs | 2,476 MCF | Dec 1976 - May 2026 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MDS Energy Development LLC | Colorado | 8,718 BBLs | 14,312 MCF | Nov 2022 - May 2026 |
| MDS Energy Development LLC | Wyoming | 16,829 BBLs | 29,383 MCF | Jan 2025 - May 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,134 BBLs | 18,705 MCF | Jan 1993 - Jun 2026 |
| Medora Minerals, LLC | North Dakota | 6,761 BBLs | 79 MCF | Nov 2018 - May 2026 |
| Mercury Resources LLC | North Dakota | 11,934 BBLs | 28,559 MCF | Dec 2018 - May 2026 |
| Meridian Energy Inc. | Kansas | 3,656 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Merit Energy Company | Wyoming | 401,080 BBLs | 222,517 MCF | Jan 1981 - May 2026 |
| Merit Energy Company, LLC | Kansas | 138,880 BBLs | 1,609,872 MCF | Jan 1980 - Mar 2026 |
| Merrion Oil & Gas Corp | New Mexico | 712 BBLs | 85,091 MCF | Jan 1993 - May 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,085 BBLs | 1,081 MCF | Jan 1978 - May 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,619 BBLs | 33,393 MCF | Jan 1980 - Mar 2026 |
| Messer LLC | Colorado | 0 BBLs | 109,319 MCF | Jan 1999 - May 2026 |
| Mewbourne Oil Co | New Mexico | 9,195,701 BBLs | 32,565,078 MCF | Jan 1993 - May 2026 |
| Mi3 Energy LLC | Wyoming | 20,230 BBLs | 4,599 MCF | Nov 2025 - May 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,289 BBLs | 0 MCF | Jan 1980 - Mar 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 5,972 BBLs | 1,040 MCF | Feb 2017 - Jun 2026 |