| 1 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Mar 2025 |
| 2 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 3 | Magic Investments LLC | Edmond, OK 73013 | Oil & Gas Operator | Jan 2025 |
| 4 | Magma Resources LLC | Paoli, OK 73074 | Oil & Gas Operator | Feb 2025 |
| 5 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | Mar 2025 |
| 6 | Majors Gary E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Dec 2024 |
| 7 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Mar 2025 |
| 8 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 9 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 10 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Feb 2025 |
| 11 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 12 | Mark A Meier Dba MSC Oil And Gas Co | Oklahoma City, OK 73105 | Oil & Gas Operator | Jan 2025 |
| 13 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Mar 2025 |
| 14 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Mar 2025 |
| 15 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2025 |
| 16 | Marmac Resources Inc | | Oil Operator | Nov 1998 |
| 17 | Marsh Oil & Gas Company | Pauls Valley, OK 73075 | Oil & Gas Operator | Feb 2025 |
| 18 | Martin Jr, James U | | Oil & Gas Operator | Feb 2025 |
| 19 | Martin Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Feb 2025 |
| 20 | Mathews Exploration Corporation | Oklahoma City, OK 73155-5328 | Oil & Gas Operator | Mar 2015 |
| 21 | Matna Enterprises LLC | Maud, OK 74854-2812 | Oil & Gas Operator | Feb 2025 |
| 22 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Feb 2025 |
| 23 | McClintock, Robert T | | Oil & Gas Operator | Jan 2025 |
| 24 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 25 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 26 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Mar 2025 |
| 27 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Mar 2025 |
| 28 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 29 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Feb 2025 |
| 30 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Feb 2025 |
| 31 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 32 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 33 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 34 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 35 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 36 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Mar 2025 |
| 37 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Feb 2025 |
| 38 | Moore Investments LC | Oklahoma City, OK 73116-9044 | Oil & Gas Operator | Feb 2023 |
| 39 | Moran Oil Enterprises, LLC | Seminole, OK 74818 | Oil & Gas Operator | Dec 2019 |
| 40 | Moran-K Oil LLC | Seminole, OK 74868 | Oil & Gas Operator | Mar 2025 |
| 41 | Moran-Kahn Oil | Seminole, OK 74868 | Oil & Gas Operator | Mar 1992 |
| 42 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |