| 1 | M & K Operating LLC | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 2 | Mahler, Kelly Operating | Graham, TX 76450 | Oil & Gas Operator | Mar 2017 |
| 3 | Mantle Oil & Gas, LLC | Friendswood, TX 77546 | Oil & Gas Operator | Mar 2025 |
| 4 | Maranatha Exploration, LP | Wichita Falls, TX 76307 | Oil Operator | Feb 2012 |
| 5 | Marathon Oil Company | Houston, TX 77024 | Oil & Gas Operator | Jan 2025 |
| 6 | Marjac Oil Company, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Mar 2025 |
| 7 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 8 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 9 | Masada Oil & Gas Company LTD. | Abilene, TX 79603 | Oil & Gas Operator | Mar 2025 |
| 10 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Mar 2025 |
| 11 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 12 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Mar 2025 |
| 13 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Mar 2025 |
| 14 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Mar 2025 |
| 15 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 16 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 17 | McCracken, H. L. Company | Wichita Falls, TX 76302 | Oil & Gas Operator | Mar 2025 |
| 18 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 19 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 20 | McIver, Terry L. | Santa Anna, TX 76878 | Oil & Gas Operator | Aug 2003 |
| 21 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 22 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 23 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 24 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 25 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Mar 2025 |
| 26 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Mar 2025 |
| 27 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 28 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 29 | Misener Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2010 |
| 30 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 31 | MJM Oil & Gas, Inc. | Dallas, TX 75201 | Oil & Gas Operator | Aug 2003 |
| 32 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Jun 2016 |
| 33 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 34 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 35 | Moore, Miles Inc. | Moran, TX 76464 | Oil & Gas Operator | Mar 2025 |
| 36 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 37 | Morrell, W. R. | Albany, TX 76430 | Oil & Gas Operator | Mar 2025 |
| 38 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 39 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Mar 2025 |
| 40 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 41 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Mar 2025 |