| 1 | M & M Oil & Gas Exploration Inc | Abilene, TX 79601 | Oil & Gas Operator | Mar 2008 |
| 2 | M-Tex Resources, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Oct 2025 |
| 3 | M.R.M. Operating, Inc. | Midland, TX 79707 | Oil & Gas Operator | Aug 2003 |
| 4 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 5 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 6 | Masada Oil & Gas | Quanah, TX 79252 | Oil & Gas Operator | Oct 2025 |
| 7 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 8 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 9 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 10 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 11 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 12 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 13 | McIver, Inc | San Angelo, TX 76903 | Oil & Gas Operator | Oct 2025 |
| 14 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 15 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 16 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 17 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 19 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 20 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 21 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Oct 2025 |
| 22 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Oct 2025 |
| 23 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 24 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 25 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 26 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 27 | Mist Prod. & Exploration Corp. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 28 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 29 | MMG Oil Company | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2006 |
| 30 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 31 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 32 | Moore Investment Co. | Abilene, TX 79604 | Oil & Gas Operator | Oct 2025 |
| 33 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 34 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 35 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Oct 2025 |
| 36 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 37 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Jan 2025 |