| 1 | M & A Oil Company, LTD. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 2 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Sep 2026 |
| 3 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Sep 2026 |
| 4 | Macha Enterprises, Inc. | Wichita Falls, TX 76309 | Oil Operator | Sep 2026 |
| 5 | Maddox Operating | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 6 | Maledon Enterprises | Austin, TX 78738 | Oil & Gas Operator | Feb 1996 |
| 7 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 8 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 9 | Marata Oil & Gas Company | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 10 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 11 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 12 | Marshall Energy, Inc. | Dallas, TX 75243 | Oil & Gas Operator | May 1997 |
| 13 | Massie Oil Company | Graham, TX 76450 | Oil & Gas Operator | Sep 2026 |
| 14 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Sep 2026 |
| 15 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 16 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 17 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 18 | McCauley Production | Graham, TX 76450 | Oil Operator | Sep 2026 |
| 19 | McCormick Operating, L.L.C. | Olney, TX 76374 | Oil Operator | Sep 2015 |
| 20 | McCown Engineering | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 2026 |
| 21 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 22 | McDay Energy Corp. | Plano, TX 75024 | Oil & Gas Operator | Sep 2026 |
| 23 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 24 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 25 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 26 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Sep 2026 |
| 27 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 28 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Sep 2026 |
| 29 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Sep 2026 |
| 30 | Miles Production Co. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2008 |
| 31 | Miller, Glenn J. | Muenster, TX 76252 | Oil & Gas Operator | Jul 2025 |
| 32 | Mills Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 33 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 34 | Mobil Petro Vac, Inc. | Duncan, OK 73533 | Oil & Gas Operator | Sep 2026 |
| 35 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 36 | Mobile Petrovac, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 37 | Moller, Herbert T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 38 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 39 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 40 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | Sep 2026 |
| 41 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 42 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2026 |