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| Operator | Operating State | Recent Oil Production | Recent Gas Production | Production Dates on File |
|---|---|---|---|---|
| Merit Energy Company | Wyoming | 414,084 BBLs | 218,091 MCF | Jan 1981 - Aug 2025 |
| Merit Energy Company, LLC | Kansas | 168,247 BBLs | 1,819,034 MCF | Jan 1980 - Jun 2025 |
| Merrion Oil & Gas Corp | New Mexico | 760 BBLs | 103,806 MCF | Jan 1993 - Aug 2025 |
| Merrion Oil & Gas Corporation | Wyoming | 1,348 BBLs | 57,063 MCF | Jan 1978 - Jul 2025 |
| Messenger Petroleum, Inc. | Kansas | 1,370 BBLs | 48,861 MCF | Jan 1980 - Jun 2025 |
| Messer LLC | Colorado | 0 BBLs | 85,614 MCF | Aug 2021 - Aug 2025 |
| Mewbourne Oil Co | New Mexico | 8,558,951 BBLs | 32,243,986 MCF | Jan 1993 - Jul 2025 |
| Michael D. Weilert Oil Company | Kansas | 1,491 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Mid-Con Energy Operating LLC | Wyoming | 7,521 BBLs | 2,653 MCF | Feb 2017 - Aug 2025 |
| Mid-Continent Resources, Inc. | Kansas | 1,279 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Mid-South Trading, Inc. | Louisiana | 2,454 BBLs | 0 MCF | Dec 1995 - Jan 2025 |
| Middle Fork Energy Uinta, LLC | Utah | 106,599 BBLs | 7,629,251 MCF | Sep 2018 - Jul 2025 |
| Mike Kelso Oil, Inc. | Kansas | 9,954 BBLs | 76,711 MCF | Jan 1980 - Jun 2025 |
| Miller Energy Company II LLC | Michigan | 17,037 BBLs | 0 MCF | Jan 1982 - Aug 2025 |
| Mineral Ventures, Inc. | Louisiana | 687 BBLs | 39,684 MCF | Mar 1998 - Dec 2024 |
| Missouri River Resources ND, LLC | North Dakota | 7,552 BBLs | 40,838 MCF | Nov 2014 - Aug 2025 |
| Mobil Oil Exploration & Producing Southeast, Inc. | Alabama | 196 BBLs | 619,935 MCF | Aug 1976 - Jul 2025 |
| Mogo Reagan, LLC | Montana | 3,515 BBLs | 11,468 MCF | Nov 2019 - Jul 2025 |
| Moncrief W A Jr | Wyoming | 360 BBLs | 22,880 MCF | Jan 1978 - Aug 2025 |
| Montalban Oil & Gas Operations, Inc. | Montana | 2,938 BBLs | 70,723 MCF | Jan 1991 - Jul 2025 |
| Morningstar Operating LLC | Colorado | 0 BBLs | 175,738 MCF | Jun 2020 - Jul 2025 |
| Morningstar Operating LLC | Montana | 302,242 BBLs | 475,090 MCF | Jan 2024 - Jul 2025 |
| Morningstar Operating LLC | New Mexico | 119,377 BBLs | 3,252,031 MCF | Sep 2020 - Jul 2025 |
| Morningstar Operating LLC | North Dakota | 30,230 BBLs | 40,735 MCF | Oct 2024 - Aug 2025 |
| Mosbacher Energy Company | Mississippi | 14,571 BBLs | 7,245 MCF | Dec 1976 - Jun 2025 |
| Mr NM Operating LLC | New Mexico | 9,562 BBLs | 56,987 MCF | Mar 2021 - Aug 2025 |
| MTM Petroleum, Inc. | Kansas | 472 BBLs | 20,006 MCF | Jan 1980 - Jun 2025 |
| Mull Drilling Company Inc | Colorado | 21,580 BBLs | 135,830 MCF | Jan 1999 - Aug 2025 |
| Mull Drilling Company, Inc. | Kansas | 19,204 BBLs | 22,222 MCF | Jan 1980 - Jun 2025 |
| Mulloy Operating, Inc. | New Mexico | 6,796 BBLs | 6,515 MCF | Jul 2006 - Jul 2025 |
| Murex Petroleum Corporation | North Dakota | 252,576 BBLs | 615,211 MCF | Apr 2001 - Aug 2025 |
| Murfin Drilling Co., Inc. | Kansas | 79,246 BBLs | 1,238 MCF | Jan 1980 - Jun 2025 |
| Murfin Drilling Company, Inc. | North Dakota | 14,507 BBLs | 9,802 MCF | Mar 2025 - Aug 2025 |
| Murphrey Oil Company, Inc. | Louisiana | 3,563 BBLs | 0 MCF | Feb 2020 - Jan 2025 |
| Muskegon Operating Company LLC | Michigan | 26,940 BBLs | 362,923 MCF | Jan 2021 - Aug 2025 |
| Mustang Energy Corporation | Kansas | 5,660 BBLs | 0 MCF | Jan 1980 - Jun 2025 |
| Mustang Holding, LLC (Finnex) | Alaska | 31,465 BBLs | 41,950 MCF | Dec 2024 - Aug 2025 |
| Mustang Resources LLC | New Mexico | 296 BBLs | 113,696 MCF | Sep 2018 - Aug 2025 |
| Mustang Resources LLC | Wyoming | 1,170 BBLs | 192,930 MCF | Nov 2014 - Aug 2025 |
| Muzyl Oil Corp | Michigan | 30 BBLs | 166,706 MCF | Nov 2016 - Aug 2025 |
| MWK Petroleum, LLC | Kansas | 2,108 BBLs | 0 MCF | Jan 2020 - Jun 2025 |
| N-10 Exploration, LLC | Kansas | 1,553 BBLs | 52,292 MCF | Jan 2010 - Jun 2025 |
| Nadel And Gussman LLC | Kansas | 1,982 BBLs | 3,252 MCF | Jan 1980 - Jun 2025 |
| Nadel And Gussman Ruston, LLC | Louisiana | 7,961 BBLs | 1,173,013 MCF | Mar 2012 - Dec 2024 |
| Natural Gas Processing Company | Wyoming | 1,263 BBLs | 10,765 MCF | Feb 1978 - Aug 2025 |
| Navigation Powder River LLC | Wyoming | 16,369 BBLs | 65,790 MCF | Dec 2016 - Aug 2025 |
| Nec Operating - Kansas, LLC | Kansas | 3,006 BBLs | 5,097 MCF | Jan 2020 - Jun 2025 |
| Neptune Operating LLC | Montana | 1,103 BBLs | 3,409 MCF | Oct 2022 - Jul 2025 |
| Neptune Operating LLC | North Dakota | 709,279 BBLs | 1,875,151 MCF | Jan 2023 - Aug 2025 |
| New Age Oil LLC | Kansas | 2,979 BBLs | 91 MCF | Feb 1982 - Jun 2025 |