| 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 H W, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Jul 1996 |
| 4 | M.J.O.G., Inc. | Fort Smith, AR 72903 | Oil Operator | Mar 2015 |
| 5 | Magna Oil & Gas Corporation | Irving, TX 75017 | Oil & Gas Operator | Feb 2016 |
| 6 | Magnum Petroleum, Inc. | Palm Desert, CA 92260 | Oil & Gas Operator | Nov 2013 |
| 7 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 8 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 9 | Marshall R. Young Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 10 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Oct 2025 |
| 11 | Martin, Jimmy Inc | San Angelo, TX 76904 | Oil & Gas Operator | Oct 2025 |
| 12 | Masters Rat Hole Service, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Nov 1998 |
| 13 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 14 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 15 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Oct 2025 |
| 16 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 17 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 18 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 19 | McKay Oil | Portales, NM 88130 | Oil & Gas Operator | Apr 1996 |
| 20 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 21 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 22 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 23 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 24 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Oct 2025 |
| 25 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Oct 2025 |
| 26 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 27 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Oct 2025 |
| 28 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 29 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 30 | Millennium Operating Company | Houston, TX 77057 | Oil & Gas Operator | Oct 2025 |
| 31 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 32 | Mist Prod. & Exploration Corp. | Midland, TX 79702 | Oil & Gas Operator | Oct 2025 |
| 33 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Jul 2025 |
| 34 | Mole Hole Prod. | Bridgeport, TX 76426 | Oil Operator | Oct 2025 |
| 35 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 36 | Montgomery Royalty | Moran, TX 76464 | Oil & Gas Operator | Oct 2025 |
| 37 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Oct 2025 |
| 38 | Morris, W. Dale Inc. | Mineral Wells, TX 76068 | Oil & Gas Operator | Oct 2025 |
| 39 | Mortimer Exploration Company | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2003 |
| 40 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Oct 2025 |
| 41 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Oct 2025 |
| 42 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 43 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |