| 1 | M B Oilfield Services | Oklahoma City, OK 73136 | Oil & Gas Operator | Jun 2003 |
| 2 | M E Klein & Associates LLC | Washington, OK 73070-8106 | Oil & Gas Operator | Jan 2024 |
| 3 | M M Energy, Inc. | Oklahoma City, OK 73156 | Oil & Gas Operator | Dec 2023 |
| 4 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Jan 2024 |
| 5 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 6 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 7 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 8 | Marion Corporation | | Oil & Gas Operator | Jan 2001 |
| 9 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2023 |
| 10 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2023 |
| 11 | Marshall Oil Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2017 |
| 12 | Matador E & P Company Inc | | Oil & Gas Operator | May 2020 |
| 13 | Maverick Brothers Resources LLC | Enid, OK 73702-0392 | Oil & Gas Operator | Jan 2024 |
| 14 | Maxey Homer G | | Oil & Gas Operator | Nov 1997 |
| 15 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | Dec 2023 |
| 16 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Jan 2024 |
| 17 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Jan 2024 |
| 18 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 19 | Mep Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 20 | Meridian Oil Trading Inc | Houston, TX 77060 | Oil & Gas Operator | Mar 2014 |
| 21 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 22 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2024 |
| 23 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2023 |
| 24 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 25 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 26 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 27 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 28 | Mija LLC | | Oil & Gas Operator | Jan 2024 |
| 29 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 30 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2024 |
| 31 | Monroe Natural Gas Inc | Norman, OK 73070-5687 | Oil & Gas Operator | Jan 2024 |
| 32 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 33 | Morrison Oil Company | Bartlesville, OK 74005-1059 | Oil Operator | Mar 2015 |
| 34 | Mountain Front Pipeline Co, Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 35 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Apr 2024 |
| 36 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Jan 2024 |
| 37 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Nov 2023 |
| 38 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 39 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jan 2024 |
| 40 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |