| 1 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 2 | M & M Oil & Gas Exploration Inc | Abilene, TX 79601 | Oil & Gas Operator | Mar 2008 |
| 3 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Oct 2025 |
| 4 | M-Tex Resources, Inc. | Merkel, TX 79536 | Oil & Gas Operator | Oct 2025 |
| 5 | M. E. Operating & Services, Inc. | Fort Worth, TX 76104 | Oil & Gas Operator | Oct 2025 |
| 6 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 7 | Marianas Operating Co. | Abilene, TX 79601 | Oil & Gas Operator | Aug 2003 |
| 8 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 9 | Market Street Energy, Inc. | Flatonia, TX 78941 | Oil & Gas Operator | Oct 2025 |
| 10 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 11 | Masa Energy LLC | Houston, TX 77094 | Oil & Gas Operator | Oct 2025 |
| 12 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 13 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Oct 2025 |
| 14 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 15 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 16 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 17 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Oct 2025 |
| 18 | McClymond, B. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2020 |
| 19 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Oct 2025 |
| 20 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 21 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 22 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Oct 2025 |
| 23 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 24 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 25 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 26 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Oct 2025 |
| 27 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2025 |
| 28 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 29 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 30 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 31 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 32 | Mirando Resource, L.L.C. | Freer, TX 78357 | Oil & Gas Operator | Oct 2025 |
| 33 | Mist Prod. & Exploration Corp. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 34 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 35 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jul 2025 |
| 36 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 37 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2025 |
| 38 | Montgomery Petroleum, Inc. | Dallas, TX 75206 | Oil & Gas Operator | Aug 2007 |
| 39 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 40 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 41 | Morrison DRLG. & Prod. Co., Inc. | Abilene, TX 79606 | Oil & Gas Operator | Nov 2008 |
| 42 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Oct 2025 |
| 43 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 44 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |