| 1 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Apr 2026 |
| 2 | Magnum Engineering Company | Corpus Christ, TX 78401 | Oil & Gas Operator | Sep 2026 |
| 3 | Manti Exploration Operating LLC | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Feb 2015 |
| 4 | Manti Operating Company | Covington, LA 70435 | Oil & Gas Operator | Sep 2026 |
| 5 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 6 | Manzano, LLC | Roswell, NM 88202 | Oil & Gas Operator | Sep 2026 |
| 7 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 8 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Jun 2026 |
| 9 | Marple Petroleum LLC | Edmond, OK 73013 | Oil Operator | May 2026 |
| 10 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 11 | Marshfield Oil & Gas, LLC | Houston, TX 77070 | Oil & Gas Operator | Sep 2026 |
| 12 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 13 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 14 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 15 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 16 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Sep 2026 |
| 17 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 18 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 19 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 20 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Sep 2026 |
| 21 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 22 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 23 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 24 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 25 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 26 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 27 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 28 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 29 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 30 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 31 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 32 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 33 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 34 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 35 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 36 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 37 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2026 |
| 38 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 39 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 40 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 41 | Moody Oil Co. | Pearsall, TX 78061 | Oil & Gas Operator | Sep 2026 |
| 42 | Morrow Resources, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2004 |
| 43 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Sep 2026 |
| 44 | Mulloy Operating, Inc. | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 45 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 46 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 47 | Murchison Oil And Gas, LLC | Dallas, TX 75229 | Oil & Gas Operator | Feb 2025 |
| 48 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 49 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Sep 2026 |