| 1 | M E G G , Inc. | Borger, TX 79008 | Oil & Gas Operator | Sep 2003 |
| 2 | Macina, P.T. | Shamrock, TX 79079 | Gas Operator | Oct 2025 |
| 3 | Magic City Oil & Gas | Amarillo, TX 79109 | Oil & Gas Operator | Oct 2025 |
| 4 | Makar Production Company | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 5 | Malson Oil Company | Crawford, OK 73638 | Oil & Gas Operator | Dec 2016 |
| 6 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 7 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 8 | Marsh Operating Company | Dallas, TX 75221 | Oil & Gas Operator | Jun 2025 |
| 9 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Oct 2025 |
| 10 | McKinney Operating Company | Canadian, TX 79014 | Gas Operator | May 2002 |
| 11 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 12 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 13 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 14 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 15 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 16 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 17 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 18 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2025 |
| 19 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 20 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 21 | Milam, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Oct 2025 |
| 22 | Minco Oil And Gas Co. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2024 |
| 23 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 24 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 25 | Mito Resources TX LLC | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 26 | MJ Oil, Inc. | Houston, TX 77265 | Oil & Gas Operator | Oct 2025 |
| 27 | MK Operating Co. | Pampa, TX 79065 | Oil & Gas Operator | Jun 2014 |
| 28 | MMGL TXPH, LLC | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 29 | Mobeetie Resource Dev LLC | Perryton, TX 79070 | Oil & Gas Operator | Oct 2025 |
| 30 | Mon Corp. | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 31 | Morgas | Shamrock, TX 79079 | Gas Operator | Nov 1994 |
| 32 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 33 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |