| 1 | M & D Pumping Service Inc | Ringwood, OK 73768-3415 | Oil & Gas Operator | Jul 2025 |
| 2 | M And V Resources Inc | Crescent, OK 73028 | Oil & Gas Operator | Jul 2025 |
| 3 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Jul 2025 |
| 4 | M M Resources, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 5 | M. M. & M. Resources, Inc. | Wetumka, OK 74883 | Oil & Gas Operator | Apr 2020 |
| 6 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2025 |
| 7 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 8 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Jul 2025 |
| 9 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Jul 2025 |
| 10 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 11 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 12 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 13 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Jul 2025 |
| 14 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Jun 2025 |
| 15 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2025 |
| 16 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 17 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 18 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Jul 2025 |
| 19 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Jun 2025 |
| 20 | McDe Energy Company Inc | Enid, OK 73706 | Oil & Gas Operator | May 2009 |
| 21 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 22 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 23 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 24 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jun 2025 |
| 25 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jul 2025 |
| 26 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 27 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Jul 2025 |
| 28 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 29 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 30 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 31 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 32 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 33 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 34 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 35 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 36 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 37 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 38 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 39 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 40 | Miller Oil & Gas Co | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2017 |
| 41 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 42 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Jun 2025 |
| 43 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Jun 2025 |
| 44 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Oct 2025 |
| 45 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Jul 2025 |
| 46 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Jul 2025 |
| 47 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 48 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | May 2024 |
| 49 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 50 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |
| 51 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 52 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |