| 1 | M & H Enterprises | Bartlesville, OK 74006-5504 | Oil & Gas Operator | Jan 2013 |
| 2 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 3 | Macro Oil Company | Bartlesville, OK 74006 | Oil Operator | Aug 1999 |
| 4 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 5 | Marjo Operating Mid-Continent LLC | | Oil & Gas Operator | Feb 2024 |
| 6 | Mason Oil Company Inc | Nowata, OK 74048 | Oil Operator | Oct 2007 |
| 7 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 8 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Jan 2024 |
| 9 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 10 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 11 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 12 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 13 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 14 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2024 |
| 15 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 16 | Milburn R Kenneth | Ardmore, OK 73402-1118 | Oil & Gas Operator | Sep 2014 |
| 17 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2024 |
| 18 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 19 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 20 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |