| 1 | M & H Enterprises | Bartlesville, OK 74006-5504 | Oil & Gas Operator | Jan 2013 |
| 2 | Macro Oil Company | Bartlesville, OK 74006 | Oil Operator | Aug 1999 |
| 3 | Mantex Inc | Tulsa, OK 74114-6234 | Oil & Gas Operator | Mar 2015 |
| 4 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 5 | Mason Oil Company Inc | Nowata, OK 74048 | Oil Operator | Oct 2007 |
| 6 | Matoush Wade E | | Oil & Gas Operator | Mar 2014 |
| 7 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Jun 2025 |
| 8 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 9 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 10 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 11 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2025 |
| 12 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 13 | Milburn R Kenneth | Ardmore, OK 73402-1118 | Oil & Gas Operator | Sep 2014 |
| 14 | Mitchell James D | Bartlesville, OK 74006-7610 | Oil Operator | Jun 2025 |
| 15 | Moms Oil & Gas LLC | Nowata, OK 74048 | Oil & Gas Operator | Mar 2023 |
| 16 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |