| 1 | M IV Ops., Inc. | San Antonio, TX 78217 | Oil & Gas Operator | Mar 1998 |
| 2 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Dec 2024 |
| 3 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 4 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Dec 2024 |
| 5 | McCormack, Lowell Ray | Gainesville, TX 76240 | Oil & Gas Operator | Dec 1993 |
| 6 | McCormack, Paul H. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2003 |
| 7 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 8 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 9 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 10 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Dec 2024 |
| 11 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 12 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Dec 2024 |
| 13 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 14 | Miller, Glenn J. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2024 |
| 15 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 16 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Dec 2024 |
| 17 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2024 |
| 18 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2024 |
| 19 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 20 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | Dec 2024 |
| 21 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2024 |