| 1 | M & D Oil & Gas | Levelland, TX 79336 | Oil & Gas Operator | Aug 2000 |
| 2 | Manzano Oil Corporation | Roswell, NM 88202 | Oil & Gas Operator | Feb 2005 |
| 3 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 4 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 5 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Dec 2024 |
| 6 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 7 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 8 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 9 | McCurdy Energy LLC | Midland, TX 79705 | Oil Operator | Dec 2024 |
| 10 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 11 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 12 | McDonald Production, LLC | Lubbock, TX 79408 | Oil Operator | Dec 2024 |
| 13 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 14 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 15 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 16 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 17 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 18 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 19 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Dec 2024 |
| 20 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 21 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Aug 2024 |
| 22 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 23 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 24 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Dec 2024 |
| 25 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Dec 2024 |
| 26 | MJB Production Company, Inc. | Brownfield, TX 79316 | Oil & Gas Operator | Dec 2024 |
| 27 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 28 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 29 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2024 |
| 30 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2024 |
| 31 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 32 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 33 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 34 | Muras Energy, Inc. | Edmond, OK 73013 | Oil & Gas Operator | Oct 2024 |
| 35 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 36 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |