| 1 | M-W-D Oil Co. | Odessa, TX 79760 | Oil & Gas Operator | Jul 1999 |
| 2 | M2 Squared Operating, LLC | Rockwall, TX 75032 | Oil Operator | Oct 2025 |
| 3 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 4 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 5 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 6 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 7 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 8 | Martin Foree Operating II, LLC | Royse City, TX 75189 | Oil & Gas Operator | Oct 2025 |
| 9 | Martin Foree Operating, LLC | Royse City, TX 75189 | Oil & Gas Operator | Oct 2025 |
| 10 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 11 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 12 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 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 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 16 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 17 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Oct 2025 |
| 18 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 19 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 20 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 21 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 22 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Oct 2025 |
| 23 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 24 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 25 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 26 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 27 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 28 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 29 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 30 | Mike Oil LLC | Colorado City, TX 79512 | Oil Operator | Oct 2025 |
| 31 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 32 | Millwee, John F. | Midland, TX 79705 | Oil & Gas Operator | Jul 2018 |
| 33 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 34 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 35 | Mito Resources TX LLC | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 36 | MLC Operating, LP | Houston, TX 77063 | Oil & Gas Operator | Oct 2025 |
| 37 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 38 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 39 | Mogul Resources, LLC | Cisco, TX 76437 | Oil & Gas Operator | Oct 2025 |
| 40 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 41 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 42 | Moonlite Oil & Gas Company | Imperial, TX 79743 | Oil & Gas Operator | Oct 2025 |
| 43 | Mosaic Midland LLC | Dallas, TX 75367 | Oil Operator | Oct 2025 |
| 44 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 45 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Oct 2025 |
| 46 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 47 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 48 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 49 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 50 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 51 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Oct 2025 |
| 52 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |