| 1 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Feb 2024 |
| 2 | Mackellar Inc | Oklahoma City, OK 73154-0298 | Oil & Gas Operator | Feb 2024 |
| 3 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Feb 2024 |
| 4 | Majors John Dba Majors Production Co | Weleetka, OK 74880-0702 | Oil & Gas Operator | Jan 2024 |
| 5 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 6 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jan 2024 |
| 7 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 8 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Jan 2024 |
| 9 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 10 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Feb 2024 |
| 11 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 12 | Mercury Production Company | Fort Worth, TX 76113 | Gas Operator | Aug 2012 |
| 13 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Oct 2022 |
| 14 | Meridian Oil Trading Inc | Houston, TX 77060 | Oil & Gas Operator | Mar 2014 |
| 15 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 16 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jan 2024 |
| 17 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 18 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 19 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2024 |
| 20 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 21 | Mountain Front Pipeline Co, Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 22 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Apr 2024 |
| 23 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2024 |
| 24 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jan 2024 |
| 25 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Feb 2024 |