| 1 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Mar 2025 |
| 2 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 3 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Apr 2025 |
| 4 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 5 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 6 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 7 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Mar 2025 |
| 8 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 9 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 10 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Mar 2025 |
| 11 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Jun 2025 |
| 12 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 13 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 14 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 15 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 16 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Apr 2025 |
| 17 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Mar 2025 |
| 18 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 19 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 20 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 21 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jun 2025 |
| 22 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Mar 2025 |
| 23 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 24 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 25 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 26 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 27 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 28 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 29 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 30 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 31 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Apr 2025 |
| 32 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 33 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 34 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Apr 2025 |
| 35 | Moabb Oil Corp | | Oil & Gas Operator | Apr 1998 |
| 36 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 37 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | Mar 2025 |
| 38 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2025 |
| 39 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Mar 2025 |
| 40 | Morris Ed Dba Morris Operating Company | Mounds, OK 74047-4801 | Oil & Gas Operator | Apr 2025 |
| 41 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |
| 42 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 43 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 44 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2025 |
| 45 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |