| 1 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jan 2025 |
| 2 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Jan 2025 |
| 3 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 4 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2025 |
| 5 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 6 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Jan 2025 |
| 7 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2024 |
| 8 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Nov 2024 |
| 9 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Dec 2024 |
| 10 | Martin'S Resources LLC | Woodward, OK 73801-5641 | Oil & Gas Operator | Dec 2024 |
| 11 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Dec 2024 |
| 12 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 13 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 14 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jan 2025 |
| 15 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jan 2025 |
| 16 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Jan 2025 |
| 17 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 18 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 19 | Mewbourne Marketing Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2013 |
| 20 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 21 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2024 |
| 22 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 23 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 24 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 25 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 26 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2025 |
| 27 | Morris Ed Dba Morris Operating Company | Mounds, OK 74047-4801 | Oil & Gas Operator | Jan 2025 |
| 28 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Mar 2025 |
| 29 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 30 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2024 |
| 31 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2025 |
| 32 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |