| 1 | M & J Energy, Inc. | Breckenridge, CO 80424 | Oil & Gas Operator | Oct 2025 |
| 2 | M-T Petroleum, Inc. | Andrews, TX 79714 | Oil & Gas Operator | Mar 2008 |
| 3 | M2 Squared Operating, LLC | Rockwall, TX 75032 | Oil Operator | Oct 2025 |
| 4 | Madison And Wright LLC | The Colony, TX 75056 | Oil & Gas Operator | Oct 2025 |
| 5 | Manhattan Petroleum, Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 6 | Manzano LLC | Roswell, NM 88202 | Oil & Gas Operator | Oct 2025 |
| 7 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 8 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 9 | Maralo, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 10 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Aug 2025 |
| 11 | Mariah Energy Corp. | Austin, TX 78716 | Oil & Gas Operator | Apr 1999 |
| 12 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2025 |
| 13 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 14 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 15 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 16 | McKinney, M. H. | Midland, TX 79701 | Oil & Gas Operator | Apr 1995 |
| 17 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 19 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 20 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Oct 2025 |
| 21 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 22 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 23 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 24 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Oct 2025 |
| 25 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Oct 2025 |
| 26 | Miocene Oil & Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 1998 |
| 27 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Oct 2025 |
| 28 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jul 2025 |
| 29 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Oct 2025 |
| 30 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 31 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |