| 1 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 2 | M & M General Contractors, Inc. | Big Spring, TX 79720 | Oil & Gas Operator | Sep 2026 |
| 3 | Mammoth Exploration LLC | Midland, TX 79701 | Oil & Gas Operator | Jul 2023 |
| 4 | Manzanita Operating, LLC | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 5 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Jun 2026 |
| 6 | Marshco Production LLC | Colorado City, TX 79512 | Oil Operator | Sep 2026 |
| 7 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 8 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 9 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 10 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Sep 2026 |
| 11 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Sep 2026 |
| 12 | McDonald & Pomeroy Operating Co. | Pasadena, TX 77506 | Oil & Gas Operator | Aug 2003 |
| 13 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 14 | McFadden Energy TX, LLC | Lakewood, NY 14750 | Oil Operator | Sep 2026 |
| 15 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 16 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Sep 2026 |
| 17 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 18 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 19 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | May 2026 |
| 20 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 21 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 22 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Sep 2026 |
| 23 | Mission Oil Company | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2026 |
| 24 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 25 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jan 2026 |
| 26 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 27 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 28 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 29 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | May 2026 |
| 30 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Sep 2026 |
| 31 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 32 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | Sep 2026 |
| 33 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 34 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Sep 2026 |
| 35 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 36 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 37 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 38 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 39 | Murphy, Bill W. Operating Co,Inc | Richardson, TX 75080 | Oil & Gas Operator | Sep 2026 |
| 40 | Myco Industries, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 2015 |