| 1 | M & D Pumping Service Inc | Ringwood, OK 73768-3415 | Oil & Gas Operator | Jan 2026 |
| 2 | M And V Resources Inc | Crescent, OK 73028 | Oil & Gas Operator | Dec 2025 |
| 3 | M M Energy Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2025 |
| 4 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Mar 2026 |
| 5 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jan 2026 |
| 6 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 7 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 8 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 9 | Manna Corporation | Oklahoma City, OK 73162 | Oil & Gas Operator | Dec 2014 |
| 10 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 11 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Jan 2026 |
| 12 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Dec 2025 |
| 13 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 14 | Massad George H Estate | Holdenville, OK 74848 | Oil & Gas Operator | Dec 2014 |
| 15 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Mar 2026 |
| 16 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 17 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 18 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 19 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 20 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2026 |
| 21 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 22 | Michigan Oil Company | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 23 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 24 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2026 |
| 25 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 26 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 27 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 28 | Milburn R Kenneth | Ardmore, OK 73402-1118 | Oil & Gas Operator | Sep 2014 |
| 29 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Jan 2026 |
| 30 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Dec 2025 |
| 31 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 32 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Dec 2025 |
| 33 | Morrison International Energy Inc | Oklahoma City, OK 73189-0537 | Oil & Gas Operator | Feb 2025 |
| 34 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Mar 2026 |
| 35 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 36 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 37 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |