| 1 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Jun 2025 |
| 2 | M.A.R.S. Energy | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 3 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 4 | Magnum Producing, LP | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Jun 2025 |
| 5 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 6 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Apr 2025 |
| 7 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 8 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 9 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 10 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 11 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 12 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 13 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 14 | Mayjac I, LLC | Midland, TX 79710 | Oil & Gas Operator | Jun 2025 |
| 15 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 16 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 17 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Jun 2025 |
| 18 | McCurdy Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 19 | McDaniel Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Jun 2025 |
| 20 | McDaniel, Willard Jr. Oil Co. | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2005 |
| 21 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 22 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Jun 2025 |
| 23 | McGuffin, Joe Jr. | Christoval, TX 76935 | Oil & Gas Operator | Jun 2025 |
| 24 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 25 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2025 |
| 26 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 27 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2025 |
| 28 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 29 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Apr 2025 |
| 30 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jun 2025 |
| 31 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jun 2025 |
| 32 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 33 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Jun 2025 |
| 34 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 35 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 36 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2025 |
| 37 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2025 |
| 38 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 39 | Millennium Resources, LLC. | Big Lake, TX 76932 | Oil & Gas Operator | Sep 2012 |
| 40 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 41 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Jun 2025 |
| 42 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Jun 2025 |
| 43 | Minute Hand LLC | Brenham, TX 77834 | Oil & Gas Operator | Jun 2025 |
| 44 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2025 |
| 45 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 46 | MLC Operating, LP | Houston, TX 77063 | Oil & Gas Operator | Jun 2025 |
| 47 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 48 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Jun 2025 |
| 49 | Moleo Gas Corp. | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2018 |
| 50 | Molopo Energy Texas, LLC | Canada, 00100 | Oil & Gas Operator | Jan 2015 |
| 51 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Jun 2025 |
| 52 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 53 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Jun 2025 |
| 54 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 55 | Moore, J.W. Oil Co | Llano, TX 78643 | Oil Operator | Jun 2025 |
| 56 | Moore, Kirby | Ozona, TX 76943 | Oil & Gas Operator | Jul 1996 |
| 57 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Jun 2025 |
| 58 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Jun 2025 |
| 59 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jun 2025 |
| 60 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 61 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 62 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 63 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Jun 2025 |