| 1 | M & M Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Jun 2025 |
| 2 | M R Ventures LLC | Dallas, TX 75367 | Oil & Gas Operator | Aug 2025 |
| 3 | M T M Oil | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 4 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 5 | Magnum Hunter Production, Inc. | Irving, TX 75014 | Oil & Gas Operator | Dec 2019 |
| 6 | Magnum Oilfield Services LLC | Bakersfield, CA 93309 | Oil Operator | Nov 2025 |
| 7 | Majestic Oil & Gas Holding Co. | Midland, TX 79705 | Oil Operator | Nov 2025 |
| 8 | Makk Oil Production Inc. | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 9 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 10 | Manning, Jack | Odessa, TX 79760 | Oil & Gas Operator | Dec 2003 |
| 11 | Manti Tarka Permian Op, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2025 |
| 12 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 13 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 14 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Sep 2025 |
| 15 | Marathon Oil Ef LLC | Houston, TX 77252 | Oil & Gas Operator | Nov 2025 |
| 16 | Mark I Oil Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 17 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 18 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Jun 2025 |
| 19 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Nov 2025 |
| 20 | Mas Operating Co. | Midland, TX 79710 | Oil & Gas Operator | Nov 2025 |
| 21 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 22 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 23 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 24 | McDaniel Company, Inc., The | Dallas, TX 75230 | Oil & Gas Operator | Nov 2025 |
| 25 | McDonnold Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 26 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Nov 2025 |
| 27 | McGee Drilling Corporation | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 28 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 29 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 30 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 31 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 32 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 33 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Nov 2025 |
| 34 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Nov 2025 |
| 35 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Nov 2025 |
| 36 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 37 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | May 2025 |
| 38 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 39 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2025 |
| 40 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 41 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 42 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Nov 2025 |
| 43 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 44 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Nov 2025 |
| 45 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 46 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 47 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Nov 2025 |
| 48 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Nov 2025 |
| 49 | Moore Gas And Oil | Monahans, TX 79756 | Oil Operator | Nov 2025 |
| 50 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 51 | Morningstar Operating LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2025 |
| 52 | Morningstar Partners, L.P. | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2022 |
| 53 | Mosaic Pecos LLC | Dallas, TX 75367 | Oil Operator | Nov 2025 |
| 54 | Mosbacher Energy Company | Houston, TX 77002 | Oil & Gas Operator | Nov 2025 |
| 55 | Moseley, J. T. | Temple, TX 76502 | Oil & Gas Operator | Sep 2008 |
| 56 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 57 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 58 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 59 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 60 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 61 | Murray, Tom Enterprises | Monahans, TX 79756 | Oil & Gas Operator | Nov 2025 |
| 62 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 63 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Nov 2025 |
| 64 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 65 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 66 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Nov 2025 |