| 1 | M E Klein & Associates LLC | Washington, OK 73093-4663 | Oil & Gas Operator | Oct 2024 |
| 2 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Oct 2024 |
| 3 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 4 | Matthews Oil & Gas | Ada, OK 74820 | Oil & Gas Operator | Oct 2024 |
| 5 | Matthews Oil & Gas LLC | Weleetka, OK 74880-7312 | Oil & Gas Operator | Apr 2020 |
| 6 | Mayabb Oil Company Inc | Tulsa, OK 74105-5158 | Oil & Gas Operator | Sep 2024 |
| 7 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 8 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 9 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 10 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 11 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Oct 2024 |
| 12 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 13 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 14 | Midwest Operating Company Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | Nov 1999 |
| 15 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 16 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Oct 2024 |
| 17 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 18 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2024 |