| 1 | Magnum Oil & Gas | Flower Mound, TX 75028 | Oil & Gas Operator | Jul 2000 |
| 2 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Jun 2025 |
| 3 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 4 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 5 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 6 | Mark III Oil, Inc. | Wichita, KS 67206 | Oil Operator | Dec 2009 |
| 7 | Martin Oil Producers, Inc. | Garland, TX 75046 | Oil & Gas Operator | Aug 2013 |
| 8 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Aug 2025 |
| 9 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 10 | McGinness Oil Co | Wichita, KS 67202 | Oil & Gas Operator | Dec 2019 |
| 11 | McGinness Oil Company Of Kansas, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Nov 2019 |
| 12 | McGinnis Oil | | Oil & Gas Operator | Dec 2002 |
| 13 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 14 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 15 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Jun 2025 |
| 16 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 17 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Jun 2025 |
| 18 | Molitor Oil, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Jun 2025 |
| 19 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 20 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 21 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |
| 22 | Murray Oil And Gas LLC | Greensburg, KS 67054 | Oil & Gas Operator | Jun 2025 |
| 23 | Mustang Drilling | | Oil & Gas Operator | Nov 1996 |