| 1 | M E Klein & Associates, Inc. | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 2 | M.R.M. Operating, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 2003 |
| 3 | Magnet Oil LP | Bronte, TX 76933 | Oil & Gas Operator | Oct 2025 |
| 4 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Oct 2025 |
| 5 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 6 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 7 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 8 | Mark IV Energy | San Antonio, TX 78213 | Oil & Gas Operator | Apr 1993 |
| 9 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 10 | Martineau Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Jan 2025 |
| 11 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 12 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 13 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 14 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 15 | McBee, Jim Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2012 |
| 16 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Oct 2025 |
| 17 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 18 | McLain Exploration, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Mar 2008 |
| 19 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 20 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 21 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Oct 2025 |
| 22 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 23 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 24 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 25 | Miles Production Co. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2008 |
| 26 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 27 | Minuteman Energy, LLC | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2015 |
| 28 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 29 | MMG Oil Company | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2006 |
| 30 | Mole Hole Prod. | Bridgeport, TX 76426 | Oil Operator | Oct 2025 |
| 31 | Moleco, LLC | Santa Anna, TX 76878 | Oil Operator | Oct 2025 |
| 32 | Mondiale Energy, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Oct 2025 |
| 33 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 34 | Morgan Creek Production Co., Inc | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2025 |
| 35 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 36 | Morris Operating Co | Lovington, NM 88260 | Oil & Gas Operator | Oct 2025 |
| 37 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 38 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Oct 2025 |
| 39 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Oct 2025 |
| 40 | My Hop Mineral | Moorhead, MN 56560 | Oil & Gas Operator | Oct 2025 |