| 1 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 2 | M2 Squared Operating, LLC | Rockwall, TX 75032 | Oil Operator | Dec 2025 |
| 3 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 4 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 5 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Oct 2025 |
| 6 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 7 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 8 | Marjo Operating Company Inc | Tulsa, OK 741010729 | Oil & Gas Operator | Aug 2025 |
| 9 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Sep 2025 |
| 10 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | Dec 2025 |
| 11 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Dec 2025 |
| 12 | Mascot Oil Company | Schulenburg, TX 78956 | Oil & Gas Operator | Dec 2025 |
| 13 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 14 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 15 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 16 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 17 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 18 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 19 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 20 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Sep 2025 |
| 21 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 22 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Dec 2025 |
| 23 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 24 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 25 | McLeod, George L. Inc. | Houston, TX 77079 | Oil & Gas Operator | Sep 2002 |
| 26 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 27 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 28 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 29 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 30 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 31 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 32 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Dec 2025 |
| 33 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 34 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 35 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 36 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 37 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 38 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 39 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 40 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Dec 2025 |
| 41 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 42 | Mito Resources TX LLC | Edmond, OK 73013 | Oil & Gas Operator | Dec 2025 |
| 43 | MLC Co., Inc. | Dallas, TX 75201 | Oil & Gas Operator | Dec 1996 |
| 44 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 45 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2025 |
| 46 | Mogul Resources, LLC | Cisco, TX 76437 | Oil & Gas Operator | Dec 2025 |
| 47 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 48 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 49 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 50 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 51 | Mosaic Midland LLC | Dallas, TX 75367 | Oil Operator | Dec 2025 |
| 52 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 53 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Sep 2025 |
| 54 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |