| 1 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Apr 2025 |
| 2 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Jul 2025 |
| 3 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | May 2025 |
| 4 | Magaw & Zimmer | Perry, OK 73077-1055 | Oil & Gas Operator | Aug 2013 |
| 5 | Magnatex Corp | Midland, TX 79702-1311 | Oil & Gas Operator | Feb 1995 |
| 6 | Magnum Energy Inc | Norman, OK 73072-2403 | Oil & Gas Operator | May 2025 |
| 7 | Majors, Linda K | | Oil Operator | Dec 2024 |
| 8 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Apr 2025 |
| 9 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | May 2025 |
| 10 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 11 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | May 2025 |
| 12 | Marjo Oil Company | Lockhart, TX 78644 | Oil & Gas Operator | Oct 1999 |
| 13 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Apr 2025 |
| 14 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2025 |
| 15 | Mark Holloway Inc | Oklahoma City, OK 73107-6526 | Oil & Gas Operator | Apr 2025 |
| 16 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Apr 2025 |
| 17 | Martin Jr, James U | | Oil & Gas Operator | Apr 2025 |
| 18 | Mason Robert A | | Oil Operator | May 1993 |
| 19 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Apr 2025 |
| 20 | Mayo Ross L Inc | Oklahoma City, OK 73120-1426 | Oil & Gas Operator | Jan 1997 |
| 21 | McCord Al Inc | Norman, OK 73072-6720 | Oil & Gas Operator | Feb 2011 |
| 22 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 23 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Apr 2025 |
| 24 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | May 2025 |
| 25 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | May 2025 |
| 26 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 27 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 28 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 29 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 30 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 31 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 32 | Midwest Operating Company Inc | Tulsa, OK 74105-6059 | Oil & Gas Operator | Nov 1999 |
| 33 | Midwest Pipe & Supply Company | Oklahoma City, OK 73154-0245 | Oil & Gas Operator | Dec 2008 |
| 34 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | May 2025 |
| 35 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 36 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 37 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 38 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Apr 2025 |
| 39 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 40 | Moore Clay | Bradenton, FL 34211 | Oil & Gas Operator | Apr 2025 |
| 41 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Jul 2025 |
| 42 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 43 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 44 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | May 2025 |
| 45 | Mutual Oil & Gas Co | Akron, OH 44311 | Oil & Gas Operator | Dec 2001 |
| 46 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |