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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Mack Energy Corp | New Mexico | 115,967 BBLs | 359,915 MCF | Jan 1993 - Jul 2026 |
| Mad Operators LLC | Kansas | 11,093 BBLs | 513 MCF | Jan 2020 - May 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 | 47,787 BBLs | 7,745 MCF | Jan 1980 - May 2026 |
| Manning, Gregory | Kansas | 1,775 BBLs | 0 MCF | Jan 1980 - May 2026 |
| Manzanita Operating, LLC | New Mexico | 6,996 BBLs | 0 MCF | Apr 2022 - Jun 2026 |
| Manzano LLC | New Mexico | 5,612 BBLs | 12,719 MCF | Mar 2005 - Jul 2026 |
| Marathon Oil Company | North Dakota | 1,661,969 BBLs | 4,393,999 MCF | Jul 1979 - Jun 2026 |
| Marathon Oil Permian LLC | New Mexico | 619,404 BBLs | 2,447,913 MCF | Jul 2017 - Jul 2026 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 19,854 BBLs | 29,392 MCF | Jan 2022 - Jun 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 | 39,321 BBLs | 108,241 MCF | Jan 1993 - Jul 2026 |
| Matador Production Company | New Mexico | 4,665,570 BBLs | 19,297,009 MCF | Mar 2006 - Jun 2026 |
| Matrix Production Company | Wyoming | 24,227 BBLs | 26,422 MCF | Jan 1994 - Jun 2026 |
| Maverick Permian LLC | New Mexico | 117,251 BBLs | 117,171 MCF | Jul 2022 - Jun 2026 |
| Maxim Drilling & Expl Inc | Wyoming | 1,347 BBLs | 17,494 MCF | Jun 1982 - Jul 2026 |
| Maximus Operating LTD | Wyoming | 11,896 BBLs | 1,034 MCF | Jul 2014 - Jul 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 | 24,879 BBLs | 36,933 MCF | Jan 1980 - May 2026 |
| McFadden Oil Co. | Kansas | 3,115 BBLs | 0 MCF | Jan 1980 - May 2026 |
| McGinness Energy Company, Inc. | Kansas | 1,094 BBLs | 34,209 MCF | Jan 2020 - May 2026 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| McNeill Well Service LLC | Wyoming | 2,707 BBLs | 1,847 MCF | Jan 2026 - Jul 2026 |
| MDS Energy Development LLC | Colorado | 8,718 BBLs | 14,312 MCF | Nov 2022 - May 2026 |
| MDS Energy Development LLC | Wyoming | 22,980 BBLs | 36,457 MCF | Jan 2025 - Jun 2026 |
| Me-Tex Oil & Gas Inc | New Mexico | 2,991 BBLs | 17,928 MCF | Jan 1993 - Jul 2026 |
| Medora Minerals, LLC | North Dakota | 6,761 BBLs | 79 MCF | Nov 2018 - Jun 2026 |
| Mercury Resources LLC | North Dakota | 11,934 BBLs | 28,559 MCF | Dec 2018 - Jun 2026 |
| Meridian Energy Inc. | Kansas | 4,781 BBLs | 0 MCF | Jan 1980 - May 2026 |
| Merit Energy Company | Wyoming | 388,080 BBLs | 225,025 MCF | Jan 1981 - Jul 2026 |
| Merit Energy Company, LLC | Kansas | 136,229 BBLs | 633,139 MCF | Jan 1980 - May 2026 |
| Merrion Oil & Gas Corp | New Mexico | 590 BBLs | 83,541 MCF | Jan 1993 - Jul 2026 |
| Merrion Oil & Gas Corporation | Wyoming | 1,248 BBLs | 8,084 MCF | Jan 1978 - Jul 2026 |
| Messenger Petroleum, Inc. | Kansas | 1,682 BBLs | 39,827 MCF | Jan 1980 - May 2026 |
| Messer LLC | Colorado | 0 BBLs | 109,319 MCF | Jan 1999 - May 2026 |
| Mewbourne Oil Co | New Mexico | 8,935,454 BBLs | 36,191,989 MCF | Jan 1993 - Jun 2026 |
| Mi3 Energy LLC | Wyoming | 20,358 BBLs | 4,965 MCF | Nov 2025 - Jul 2026 |
| Michael D. Weilert Oil Company | Kansas | 1,471 BBLs | 0 MCF | Jan 1980 - May 2026 |
| Mid-Con Energy Operating LLC | Wyoming | 6,284 BBLs | 1,460 MCF | Feb 2017 - Jul 2026 |
| Mid-Continent Resources, Inc. | Kansas | 1,256 BBLs | 0 MCF | Jan 1980 - May 2026 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Mike Kelso Oil, Inc. | Kansas | 14,196 BBLs | 103,812 MCF | Jan 1980 - May 2026 |
| Miller Energy Company II LLC | Michigan | 15,003 BBLs | 0 MCF | Jan 1982 - Jul 2026 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |
| Missaukee Oil And Gas Company LLC | Michigan | 6,396 BBLs | 23,138 MCF | Sep 2019 - May 2026 |
| Missouri River Resources ND, LLC | North Dakota | 5,697 BBLs | 30,722 MCF | Nov 2014 - Jun 2026 |