| 1 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 2 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 3 | Marcum Drilling Co. | Midland, TX 79701 | Oil & Gas Operator | Aug 2002 |
| 4 | Marshall & Winston, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 5 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2024 |
| 6 | Martin Oil LLC | Madison, KS 66860 | Oil Operator | Aug 2024 |
| 7 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Dec 2024 |
| 8 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 9 | McFarland & Scobey, Inc. | El Paso, TX 79947 | Oil & Gas Operator | Dec 2024 |
| 10 | McKenney & Chambers Oil Company | Westbrook, TX 79565 | Oil & Gas Operator | Oct 2003 |
| 11 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Dec 2024 |
| 12 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Dec 2024 |
| 13 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 14 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Oct 2024 |
| 15 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 16 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2024 |
| 17 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Dec 2024 |
| 18 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 19 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 20 | Moriah Operating,LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 21 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 22 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 23 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 24 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Dec 2024 |