| 1 | M & M Exploration, Inc. | Westminster, CO 80031 | Oil & Gas Operator | Jul 2025 |
| 2 | M3V Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 3 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Jul 2025 |
| 4 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 5 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jul 2025 |
| 6 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Jul 2025 |
| 7 | Marjo Operating Mid-Continent LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 8 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Jul 2025 |
| 9 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Jun 2025 |
| 10 | Marmik Oil Company | El Dorado, AR 71730 | Oil & Gas Operator | Jan 2015 |
| 11 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 12 | Martin'S Resources LLC | Woodward, OK 73801-5641 | Oil & Gas Operator | Jun 2025 |
| 13 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 14 | May Petroleum, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Nov 1998 |
| 15 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 16 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Jun 2025 |
| 17 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 18 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 19 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jul 2025 |
| 20 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 21 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 22 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 23 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 24 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 25 | Mewbourne Marketing, Inc. | | Oil & Gas Operator | Mar 2013 |
| 26 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 27 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | May 2025 |
| 28 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 29 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 30 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 31 | Midwestern Exploration Co. | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 32 | Mija LLC | Oklahoma City, OK 73151 | Oil & Gas Operator | Jul 2025 |
| 33 | Miller Oil & Gas Co | Okmulgee, OK 74447 | Oil & Gas Operator | Oct 2017 |
| 34 | Mobil Exp & Prod Us Inc | Houston, TX 77060-1991 | Oil & Gas Operator | May 2001 |
| 35 | Monexco | Edmond, OK 73034-3776 | Oil & Gas Operator | Mar 2008 |
| 36 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 37 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 38 | Moore Robert L | Perryton, TX 79070-1275 | Oil & Gas Operator | Apr 2020 |
| 39 | Moss Ted A Operating Company | Oklahoma City, OK 73126-0187 | Oil & Gas Operator | Jun 1997 |
| 40 | Mott Energy LLC | Riverview, FL 33569-6702 | Oil & Gas Operator | Sep 2024 |
| 41 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 42 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 43 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jul 2025 |