| 1 | M & M General Contractors, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Oct 2025 |
| 2 | M2 Squared Operating, LLC | Rockwall, TX 75032 | Oil Operator | Oct 2025 |
| 3 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 4 | Manzanita Corporation | Midland, TX 79710 | Oil & Gas Operator | Nov 2008 |
| 5 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 6 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 7 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 8 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Oct 2025 |
| 9 | Martex Oil & Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Oct 2025 |
| 10 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 11 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Oct 2025 |
| 12 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 13 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 14 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 15 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 16 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 17 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Oct 2025 |
| 18 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 19 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 20 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 21 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 22 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 23 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 24 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 25 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 26 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 27 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 28 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 29 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 30 | Mitchell Resources, Inc. | Addison, TX 75001 | Oil & Gas Operator | Aug 2003 |
| 31 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 32 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 33 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 34 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2025 |
| 35 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 36 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 37 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 38 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Oct 2025 |
| 39 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 40 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 41 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2025 |
| 42 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 43 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 44 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |