| 1 | Magnum Engineering Company | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Oct 2025 |
| 2 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 3 | Mak-J Energy Partners(TX),LTD. | Denver, CO 80206 | Oil & Gas Operator | Sep 2013 |
| 4 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 5 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |
| 6 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 7 | Mariner Energy, Inc. | Houston, TX 77042 | Oil & Gas Operator | Nov 2010 |
| 8 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 9 | Massingill & McCutchin | Lubbock, TX 79424 | Oil & Gas Operator | Aug 2003 |
| 10 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 11 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 12 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Oct 2025 |
| 13 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Jul 2025 |
| 14 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 15 | McEna Inc | Tulsa, OK 74135 | Oil & Gas Operator | Jul 2005 |
| 16 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 17 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 19 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 20 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 21 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 22 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Oct 2025 |
| 23 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 24 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 25 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 26 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 27 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 28 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 29 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 30 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 31 | Miller, Dyer & Co LLC | Denver, CO 80202 | Oil & Gas Operator | May 2009 |
| 32 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 33 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 34 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 35 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Oct 2025 |
| 36 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 37 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 38 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 39 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 40 | Mitchell, James - Operator | Lamesa, TX 79331 | Oil & Gas Operator | Mar 2008 |
| 41 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Oct 2025 |
| 42 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jul 2025 |
| 43 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 44 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Oct 2025 |
| 45 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 46 | Mosman Operating, LLC | Dallas, TX 75204 | Oil Operator | Oct 2025 |
| 47 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 48 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 49 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | May 2024 |
| 50 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 51 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 52 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 53 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 54 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 55 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Oct 2025 |