| 1 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 2 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2024 |
| 3 | Mackellar Inc | Oklahoma City, OK 73154-0298 | Oil & Gas Operator | Feb 2024 |
| 4 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 5 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 6 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 7 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2024 |
| 8 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2023 |
| 9 | Martin Jim & Julie | Wynona, OK 74084 | Oil & Gas Operator | Jan 2024 |
| 10 | Martin'S Resources LLC | | Oil & Gas Operator | Jan 2024 |
| 11 | Maverick Brothers Resources LLC | Enid, OK 73702-0392 | Oil & Gas Operator | Jan 2024 |
| 12 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Jan 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 | Feb 2024 |
| 15 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Feb 2024 |
| 16 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 17 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Oct 2022 |
| 18 | Meridian Oil Trading Inc | Houston, TX 77060 | Oil & Gas Operator | Mar 2014 |
| 19 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 20 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 21 | Mewbourne Marketing Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2013 |
| 22 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 23 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jan 2024 |
| 24 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 25 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 26 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 27 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 28 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2024 |
| 29 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 30 | Morris Ed Dba Morris Operating Company | Mounds, OK 74047-4801 | Oil & Gas Operator | Feb 2024 |
| 31 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Apr 2024 |
| 32 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 33 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jan 2024 |
| 34 | Muras Energy, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Jan 2024 |
| 35 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |
| 36 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |