| 1 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Oct 2025 |
| 2 | M & M Production LTD. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 3 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 4 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 5 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 6 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 7 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 8 | Marienfeld Exploration | Houston, TX 77005 | Oil & Gas Operator | Mar 1994 |
| 9 | Marienfeld Exploration, Inc. | Ojai, CA 93024 | Oil & Gas Operator | Oct 2025 |
| 10 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 11 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 12 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 13 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 14 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 15 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Oct 2025 |
| 16 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 17 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Oct 2025 |
| 18 | McDonald Energy, Inc. | Granbury, TX 76049 | Oil & Gas Operator | Oct 2025 |
| 19 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 20 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 21 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Oct 2025 |
| 22 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 23 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 24 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 25 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 26 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 27 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 28 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Oct 2025 |
| 29 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 30 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 31 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 32 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 33 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 34 | Millennium Resources, LLC. | Big Lake, TX 76932 | Oil & Gas Operator | Sep 2012 |
| 35 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 36 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 37 | Minute Hand LLC | Brenham, TX 77834 | Oil & Gas Operator | Oct 2025 |
| 38 | Mirando Crude Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 1994 |
| 39 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 40 | MLC Co., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 1996 |
| 41 | MM China Star Oil Co., LLC | Woodway, TX 76712 | Oil & Gas Operator | Oct 2025 |
| 42 | Moontower Resources Op, LLC | Austin, TX 78732 | Oil & Gas Operator | Apr 2025 |
| 43 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 44 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 45 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 46 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 47 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Oct 2025 |