| 1 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2026 |
| 2 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jan 2026 |
| 3 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Jan 2026 |
| 4 | Macmart Inc | Wynnewood, OK 73098 | Oil & Gas Operator | Jan 2016 |
| 5 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Apr 2025 |
| 6 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Jan 2026 |
| 7 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 8 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Sep 2025 |
| 9 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 10 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 11 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Jan 2026 |
| 12 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Dec 2025 |
| 13 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Jan 2026 |
| 14 | Marler Philip | Purcell, OK 73080-1522 | Oil & Gas Operator | Nov 2016 |
| 15 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2025 |
| 16 | Marsh Oil & Gas Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Dec 2025 |
| 17 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 18 | Masters Loy C | Davis, OK 73030-0397 | Oil & Gas Operator | Apr 2005 |
| 19 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 20 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Dec 2025 |
| 21 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Dec 2025 |
| 22 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 23 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Mar 2026 |
| 24 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 25 | Me3 Oilfield Service LLC | Tulsa, OK 74136-1236 | Oil & Gas Operator | Dec 2025 |
| 26 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jan 2026 |
| 27 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jan 2026 |
| 28 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 29 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Aug 2025 |
| 30 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 31 | Mercer Oil Co | Stratford, OK 74872-7426 | Oil & Gas Operator | Dec 2025 |
| 32 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2026 |
| 33 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 34 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 35 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Jan 2026 |
| 36 | Miller Petroleum Company | Yukon, OK 73099-0452 | Oil & Gas Operator | Aug 2009 |
| 37 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 38 | Mogo Operating, LLC | Norman, OK 73069 | Oil & Gas Operator | Jan 2026 |
| 39 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 40 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 41 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 42 | Moore Don | Elmore City, OK 73433 | Oil & Gas Operator | Dec 2025 |
| 43 | Moore Petroleum Invest Corp | Norman, OK 73072-4217 | Oil & Gas Operator | Oct 2025 |
| 44 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 45 | Moran Oil Enterprises LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 46 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Jan 2026 |
| 47 | Mott Oil & Gas | Sugarland, TX 77478 | Oil & Gas Operator | May 2001 |
| 48 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 49 | Mowdy Robert F | Coalgate, OK 74538 | Oil & Gas Operator | May 2001 |
| 50 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Mar 2026 |
| 51 | Mullins Jimmy R Dba Southcreek Petroleum Co | Dibble, OK 73031 | Oil & Gas Operator | Jan 2021 |
| 52 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 53 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 54 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2026 |
| 55 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |