| 1 | M & M Exploration Inc | Westminster, CO 80031 | Oil & Gas Operator | Nov 2025 |
| 2 | M & M Resources Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Sep 2018 |
| 3 | M H Oil & Gas LLC | Okeene, OK 73763-0684 | Oil & Gas Operator | Feb 2013 |
| 4 | M M Energy Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2025 |
| 5 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Nov 2025 |
| 6 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 7 | Magic Investments LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 8 | Maguire James Q Inc | Norman, OK 73070-1748 | Oil & Gas Operator | Jun 2011 |
| 9 | Majors Eugene E | Holdenville, OK 74848-9603 | Oil & Gas Operator | Oct 2025 |
| 10 | Malka Production Company | Oklahoma City, OK 73101-0248 | Oil & Gas Operator | Jan 2000 |
| 11 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 12 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Nov 2025 |
| 13 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Nov 2025 |
| 14 | Marbet LLC | Edmond, OK 73013-6691 | Oil & Gas Operator | Nov 2025 |
| 15 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Nov 2025 |
| 16 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Nov 2025 |
| 17 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Oct 2025 |
| 18 | Marrakesh Oil Company | Oklahoma City, OK 73118 | Oil & Gas Operator | Jun 1995 |
| 19 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 20 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 21 | Mator LLC | Hennessey, OK 73742-1235 | Oil & Gas Operator | Nov 2025 |
| 22 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Sep 2025 |
| 23 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Nov 2025 |
| 24 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Oct 2025 |
| 25 | McGinness Energy Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Oct 2025 |
| 26 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Nov 2025 |
| 27 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Nov 2025 |
| 28 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 29 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 30 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 31 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 32 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 33 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 34 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 35 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 36 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 37 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 38 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 39 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 40 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Nov 2025 |
| 41 | Miller Exploration Company | Tulsa, OK 74136-1020 | Oil & Gas Operator | Mar 2015 |
| 42 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 43 | MJM Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Nov 2025 |
| 44 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Nov 2025 |
| 45 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2025 |
| 46 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 47 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 48 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2025 |
| 49 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 50 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |