| 1 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2025 |
| 2 | M & M Construction Co. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 1996 |
| 3 | M A S Operators | Kilgore, TX 75663 | Oil & Gas Operator | Jul 1999 |
| 4 | M-C Production & Drilling Co,Inc | Longview, TX 75608 | Oil & Gas Operator | Mar 2025 |
| 5 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Mar 2025 |
| 6 | M. Grace, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Mar 2025 |
| 7 | M. J. G., Inc. | Alice, TX 78333 | Oil & Gas Operator | Jul 2010 |
| 8 | Machin & Associates, Inc. | Longview, TX 75606 | Oil & Gas Operator | Mar 2025 |
| 9 | Manziel Management Corporation | Tyler, TX 75711 | Oil Operator | Feb 2014 |
| 10 | Map Production Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 11 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 12 | Marquee Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 2025 |
| 13 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 14 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 15 | Martin Gas Sales, Inc. | Kilgore, TX 75662 | Oil & Gas Operator | May 1993 |
| 16 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 17 | Mass Energy, Inc | Houston, TX 77056 | Oil & Gas Operator | Mar 2008 |
| 18 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 19 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 20 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 21 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 22 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 23 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 24 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Mar 2025 |
| 25 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |
| 26 | McBride Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 27 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 28 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 29 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Mar 2025 |
| 30 | McFarland Energy, Inc. | New Orleans, LA 70160 | Oil & Gas Operator | Dec 2009 |
| 31 | McGoldrick Oil Company | Shreveport, LA 71129 | Oil & Gas Operator | Jul 2020 |
| 32 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 33 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 34 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 35 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 36 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 37 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Mar 2025 |
| 38 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 39 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2025 |
| 40 | Miken Oil, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2025 |
| 41 | Miller Energy Inc | Houston, TX 77024 | Oil & Gas Operator | Oct 2016 |
| 42 | Miller Production Co. | Tyler, TX 75701 | Oil & Gas Operator | Mar 2025 |
| 43 | Miller, R. A. Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Aug 2003 |
| 44 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 45 | MJ Energy Company, LLC | Kilgore, TX 75663 | Oil Operator | Mar 2025 |
| 46 | MMGL East Texas III, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 47 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Mar 2025 |
| 48 | Moon Operating, Inc. | Longview, TX 75601 | Oil & Gas Operator | Mar 2003 |
| 49 | Morgan Oil Company | Nacogdoches, TX 75963 | Oil & Gas Operator | May 2006 |
| 50 | Moss Petroleum Company | Dallas, TX 75207 | Oil & Gas Operator | Mar 2025 |
| 51 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Mar 2025 |
| 52 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2024 |
| 53 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 54 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 55 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 56 | Mustang Drilling, LTD. | Henderson, TX 75653 | Oil & Gas Operator | May 2008 |
| 57 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 58 | Mustang Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2006 |
| 59 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |