| 1 | M M Energy Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Nov 2025 |
| 2 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Feb 2026 |
| 3 | M-J Oil And Gas LLC | Wilson, OK 73463 | Oil & Gas Operator | May 2023 |
| 4 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Dec 2025 |
| 5 | Mack Oil Company | Duncan, OK 73534 | Oil & Gas Operator | Nov 2000 |
| 6 | Macmart Inc | Wynnewood, OK 73098 | Oil & Gas Operator | Jan 2016 |
| 7 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 8 | Maier Resources Inc | Oklahoma City, OK 73157-2996 | Oil & Gas Operator | Mar 2015 |
| 9 | Majoil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 1996 |
| 10 | Maloney Helen V Dba Penn-Ok Corporation | Hockessin, DE 19707-9640 | Oil & Gas Operator | Sep 2025 |
| 11 | Mapco Production Co | Billings, MT 59102 | Oil & Gas Operator | Apr 1994 |
| 12 | Maple Properties Corp | Dallas, TX 75204 | Oil & Gas Operator | Jan 1999 |
| 13 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Dec 2025 |
| 14 | Mardale Drilling Company | Oklahoma City, OK 73157 | Oil Operator | Nov 1998 |
| 15 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Dec 2025 |
| 16 | Markley Exploration | Bixby, OK 74008-5332 | Oil & Gas Operator | Jan 2014 |
| 17 | Markley L C Corporation | Fletcher, OK 73541 | Oil & Gas Operator | Aug 2002 |
| 18 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | Nov 2025 |
| 19 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 20 | Martin Oil Co. | Aspermont, TX 79502 | Oil & Gas Operator | Jul 2023 |
| 21 | Mason Robert A Production Co | Edmond, OK 73013-9102 | Oil & Gas Operator | May 2013 |
| 22 | Maxine Oil Company | Muskogee, OK 74401-0512 | Oil & Gas Operator | Sep 2014 |
| 23 | Maxland Oil Company | Haslet, TX 76052-5137 | Oil Operator | Nov 2014 |
| 24 | Mayes Donald W & Associates | Piedmont, OK 73078-0051 | Oil & Gas Operator | Dec 1996 |
| 25 | McGinley Jr, John R | | Gas Operator | Nov 1998 |
| 26 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 27 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 28 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 29 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 30 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 31 | MGD Oil Production LLC | Healdton, OK 73438-6219 | Oil Operator | Nov 2025 |
| 32 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 33 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 34 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 35 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 36 | Milburn Robert G | Countyline, OK 73025 | Oil Operator | Apr 2020 |
| 37 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 38 | Moabb Oil Corp | | Oil & Gas Operator | Apr 1998 |
| 39 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 40 | Moffitt W G Trust | Fort Gibson, OK 74434-4258 | Gas Operator | Nov 2019 |
| 41 | Mogo Operating, LLC | Norman, OK 73069 | Oil & Gas Operator | Nov 2025 |
| 42 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2025 |
| 43 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 44 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2025 |
| 45 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |