| 1 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Oct 2024 |
| 2 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Oct 2024 |
| 3 | Majors John Dba Majors Production Co | Weleetka, OK 74880 | Oil & Gas Operator | Oct 2024 |
| 4 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 5 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Oct 2024 |
| 6 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 7 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 8 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 9 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Oct 2024 |
| 10 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 11 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 12 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Sep 2024 |
| 13 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 14 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Oct 2024 |
| 15 | Mountain Front Pipeline Co Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 16 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Dec 2024 |
| 17 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 18 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2024 |