| 1 | M & S Oil Co | Lawrenceburg, IN 47025-8675-8675 | Oil & Gas Operator | Aug 2000 |
| 2 | M E Klein & Associates LLC | Washington, OK 73070-8106 | Oil & Gas Operator | Jan 2024 |
| 3 | Mac Laskey Kelly Oilfield | El Dorado, KS 67042 | Oil & Gas Operator | Jan 2024 |
| 4 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Jan 2024 |
| 5 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Feb 2024 |
| 6 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Dec 2023 |
| 7 | Marjo Operating Mid-Continent LLC | | Oil & Gas Operator | Jan 2024 |
| 8 | Marlin Oil Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2023 |
| 9 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Dec 2023 |
| 10 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 11 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 12 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 13 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2024 |
| 14 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 15 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Dec 2023 |
| 16 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 17 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 18 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2024 |
| 19 | Mija LLC | | Oil & Gas Operator | Jan 2024 |
| 20 | Miller Petroleum Company | Yukon, OK 73099-0452 | Oil & Gas Operator | Aug 2009 |
| 21 | Monexco | Edmond, OK 73034-3776 | Oil & Gas Operator | Mar 2008 |
| 22 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | Dec 2023 |
| 23 | Moore Richard L | Morris, OK 74445 | Oil Operator | Aug 2013 |
| 24 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Jan 2024 |
| 25 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Jan 2024 |
| 26 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |