| 1 | M'Red Petroleum, LLC | Pampa, TX 79065 | Oil & Gas Operator | Dec 2010 |
| 2 | M3V Energy, LLC | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 3 | Majestic Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 2007 |
| 4 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 5 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 6 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 7 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 8 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 9 | McGee, Tom Corporation | Booker, TX 79005 | Oil & Gas Operator | Aug 2025 |
| 10 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Dec 2025 |
| 11 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | Dec 2025 |
| 12 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 13 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 14 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 15 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 16 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 17 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 18 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 19 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 20 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Aug 2025 |
| 21 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 22 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 23 | Midwestern Exploration Company | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 24 | Milam, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2025 |
| 25 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 26 | Mitchell Ehrlich Oil & Gas, LLC | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 27 | MMGL TXPH, LLC | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 28 | Mobeetie Resource Dev LLC | Perryton, TX 79070 | Oil & Gas Operator | Dec 2025 |
| 29 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 30 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 31 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 32 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 33 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |