| 1 | M M Energy Inc | Oklahoma City, OK 73156 | Oil & Gas Operator | Feb 2026 |
| 2 | Mack Energy Co. | Duncan, OK 73534 | Oil & Gas Operator | Feb 2026 |
| 3 | Mackellar Inc | Oklahoma City, OK 73116-7101 | Oil & Gas Operator | Feb 2026 |
| 4 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 5 | Mallorn Energy LLC | Edmond, OK 73034 | Oil & Gas Operator | Nov 2025 |
| 6 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 7 | Marathon Oil Company LLC | Houston, TX 77079 | Oil & Gas Operator | Feb 2026 |
| 8 | Mark L Shidler Inc | Houston, TX 77055 | Oil & Gas Operator | Feb 2026 |
| 9 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Feb 2026 |
| 10 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2025 |
| 11 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 12 | Martin Production Corporation | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 13 | Mason Oil Inc | Blanchard, OK 73010-2903 | Oil & Gas Operator | Feb 2009 |
| 14 | Maverick Brothers Resources LLC | Enid, OK 73701 | Oil & Gas Operator | Jan 2026 |
| 15 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 16 | McCorgary Martin E | Arkansas City, KS 67005-5452 | Oil & Gas Operator | Feb 2026 |
| 17 | McIntyre M L | Oklahoma City, OK 73154-0523 | Oil & Gas Operator | Jul 1996 |
| 18 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 19 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 20 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Feb 2026 |
| 21 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 22 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 23 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 24 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 25 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 26 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 27 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Jan 2026 |
| 28 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 29 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 30 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 31 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Feb 2026 |
| 32 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 33 | Mild Oil Company | Duncan, OK 73533-9532 | Oil Operator | Mar 2000 |
| 34 | Minerva Oil Company | Tulsa, OK 74152-0858 | Oil & Gas Operator | Mar 2015 |
| 35 | Mink Oil Company | | Oil Operator | Nov 2003 |
| 36 | Mito Resources LLC | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 37 | MJM Resources Inc | Norman, OK 73072 | Oil & Gas Operator | Feb 2026 |
| 38 | Mogo Operating, LLC | Norman, OK 73069 | Oil & Gas Operator | Feb 2026 |
| 39 | Moncrief R W Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1994 |
| 40 | Monty L Hott Production Corporation | Oklahoma City, OK 73142 | Oil & Gas Operator | Jan 2026 |
| 41 | Moore & Moore Energy Inc | Purcell, OK 73080-0674 | Oil & Gas Operator | Dec 2012 |
| 42 | Moore David K | Duncan, OK 73575 | Oil & Gas Operator | Oct 2009 |
| 43 | Mott Energy LLC | Riverview, FL 33569-6702 | Oil & Gas Operator | Sep 2024 |
| 44 | Mott Petroleum Corporation | Sugar Land, TX 77487 | Oil & Gas Operator | Aug 2024 |
| 45 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Apr 2026 |
| 46 | Munson Dave Company | Dallas, TX 75201-3591 | Oil Operator | Aug 1996 |
| 47 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 48 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 49 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2026 |
| 50 | Mustang Gas Products LLC | Oklahoma City, OK 73114-7406 | Oil & Gas Operator | Sep 2022 |
| 51 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |