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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| M & M Exploration, Inc. | Kansas | 932 BBLs | 18,364 MCF | Mar 2002 - Jun 2025 |
| M & M Oil Company, L.L.C. | Louisiana | 2,996 BBLs | 0 MCF | Aug 1994 - Jan 2025 |
| M G Oil Inc | Kansas | 7,962 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Mack Energy Corp | New Mexico | 135,638 BBLs | 359,138 MCF | Jan 1993 - Sep 2025 |
| Mad Operators LLC | Kansas | 8,225 BBLs | 515 MCF | Jan 2020 - Jun 2025 |
| Magna Operating, LLC | Louisiana | 4,137 BBLs | 0 MCF | Sep 2010 - Dec 2024 |
| Magpie Operating, Inc | Colorado | 19,317 BBLs | 120,578 MCF | Jan 1999 - Sep 2025 |
| Mai Oil Operations, Inc. | Kansas | 47,427 BBLs | 4,293 MCF | Jan 1980 - Jun 2025 |
| Manzanita Operating, LLC | New Mexico | 6,135 BBLs | 0 MCF | Apr 2022 - Sep 2025 |
| Manzano LLC | New Mexico | 4,319 BBLs | 6,062 MCF | Mar 2005 - Sep 2025 |
| Mar-Lou Oil Co., LLC | Kansas | 1,918 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Maralex Resources, Inc | Colorado | 0 BBLs | 187,090 MCF | Jan 1999 - Sep 2025 |
| Marathon Oil Company | North Dakota | 2,031,971 BBLs | 5,202,839 MCF | Jul 1979 - Oct 2025 |
| Marathon Oil Permian LLC | New Mexico | 887,268 BBLs | 3,246,160 MCF | Jul 2017 - Oct 2025 |
| Marlin Exploration, LLC | Louisiana | 2,976 BBLs | 2,082 MCF | Mar 2015 - Jan 2025 |
| Marlin Operating, LLC | New Mexico | 58,089 BBLs | 21,667 MCF | Jan 2022 - Sep 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 | 31,932 BBLs | 105,368 MCF | Jan 1993 - Oct 2025 |
| Matador Production Company | New Mexico | 4,600,074 BBLs | 19,563,074 MCF | Mar 2006 - Oct 2025 |
| Matrix Production Company | Wyoming | 25,466 BBLs | 21,421 MCF | Jan 1994 - Sep 2025 |
| Maverick Permian LLC | New Mexico | 127,735 BBLs | 1,085,424 MCF | Jul 2022 - Sep 2025 |
| Maxim Drilling & Expl Inc | Wyoming | 1,510 BBLs | 15,151 MCF | Jun 1982 - Oct 2025 |
| Maximus Operating LTD | Wyoming | 11,552 BBLs | 818 MCF | Jul 2014 - Oct 2025 |
| 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 | 19,948 BBLs | 21,408 MCF | Jan 1980 - Jun 2025 |
| McFadden Oil Co. | Kansas | 3,492 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| McGinness Energy Company, Inc. | Kansas | 1,592 BBLs | 49,850 MCF | Jan 2020 - Jun 2025 |
| McGowan Working Partners Inc. | Mississippi | 1,758 BBLs | 2,930 MCF | Dec 1976 - Sep 2025 |
| McGowan Working Partners, Inc. | Louisiana | 22,202 BBLs | 40,083 MCF | Jan 2001 - Dec 2024 |
| MDS Energy Development LLC | Colorado | 10,844 BBLs | 14,590 MCF | Nov 2022 - Sep 2025 |
| MDS Energy Development LLC | Wyoming | 19,128 BBLs | 44,707 MCF | Jan 2025 - Oct 2025 |
| Me-Tex Oil & Gas Inc | New Mexico | 3,518 BBLs | 23,465 MCF | Jan 1993 - Oct 2025 |
| Medora Minerals, LLC | North Dakota | 7,364 BBLs | 10 MCF | Nov 2018 - Oct 2025 |
| Mega Energy LLC | Wyoming | 0 BBLs | 30,861 MCF | May 2013 - Oct 2025 |
| Mercury Resources LLC | North Dakota | 9,547 BBLs | 0 MCF | Dec 2018 - Oct 2025 |
| Meridian Energy Inc. | Kansas | 5,585 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Merit Energy Company | Wyoming | 392,144 BBLs | 214,069 MCF | Jan 1981 - Oct 2025 |
| Merit Energy Company, LLC | Kansas | 168,247 BBLs | 1,819,034 MCF | Jan 1980 - Jun 2025 |
| Merrion Oil & Gas Corp | New Mexico | 938 BBLs | 101,605 MCF | Jan 1993 - Oct 2025 |
| Merrion Oil & Gas Corporation | Wyoming | 1,282 BBLs | 53,058 MCF | Jan 1978 - Oct 2025 |
| Messenger Petroleum, Inc. | Kansas | 1,370 BBLs | 48,861 MCF | Jan 1980 - Jun 2025 |
| Messer LLC | Colorado | 0 BBLs | 61,224 MCF | Jan 1999 - Oct 2025 |
| Mewbourne Oil Co | New Mexico | 8,380,343 BBLs | 32,465,200 MCF | Jan 1993 - Sep 2025 |
| Michael D. Weilert Oil Company | Kansas | 1,491 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Mid-Con Energy Operating LLC | Wyoming | 7,409 BBLs | 2,465 MCF | Feb 2017 - Oct 2025 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Middle Fork Energy Uinta, LLC | Utah | 107,386 BBLs | 7,405,635 MCF | Sep 2018 - Sep 2025 |
| Mike Kelso Oil, Inc. | Kansas | 9,954 BBLs | 76,711 MCF | Jan 1980 - Jun 2025 |