| 1 | M & A Oil Company, LTD. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 2 | M-B Operating Co., Inc. | Rowlett, TX 75030 | Oil & Gas Operator | Feb 2026 |
| 3 | Maddox Operating | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 4 | Maguire Oil Company | Dallas, TX 75270 | Oil & Gas Operator | Mar 2015 |
| 5 | Mammoth Operating LLC | Spicewood, TX 78669 | Oil Operator | Feb 2026 |
| 6 | Maralo, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 1998 |
| 7 | Marchman, J. E. | Graham, TX 76450 | Oil & Gas Operator | Jul 2009 |
| 8 | Marcon Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Oct 2011 |
| 9 | Marrow, N. S. | Austin, TX 78703 | Oil & Gas Operator | Aug 2012 |
| 10 | Marshall, Sam | Granbury, TX 76048 | Oil & Gas Operator | Aug 2010 |
| 11 | Marshall, Samuel Meek, Estate Of | Granbury, TX 76048 | Oil & Gas Operator | Feb 2026 |
| 12 | Martin & Richards Oil Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Jul 1995 |
| 13 | Martin Bros. Oil | Graham, TX 76450 | Oil & Gas Operator | Dec 1993 |
| 14 | Martin Petroleum Corp. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 15 | Martin Well Service | Graham, TX 76450 | Oil & Gas Operator | Jun 2015 |
| 16 | Martin, John I. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 17 | Martin, Tim | Wichita Falls, TX 76302 | Oil & Gas Operator | Oct 2003 |
| 18 | Marwell Petroleum LTD Partnrship | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 19 | Mash Oilfield Services, LP | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 20 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 21 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Feb 2026 |
| 22 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Feb 2026 |
| 23 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 24 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Feb 2026 |
| 25 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 26 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 27 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 28 | McCommons Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Feb 2026 |
| 29 | McCormick Operating, L.L.C. | Olney, TX 76374 | Oil Operator | Sep 2015 |
| 30 | McCracken, Eugene | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 31 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Feb 2026 |
| 32 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 33 | McDay Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Feb 2026 |
| 34 | McDonald Production | Lubbock, TX 79408 | Oil & Gas Operator | Mar 2003 |
| 35 | McEuen, Billy Oil Co. | Bowie, TX 76230 | Oil & Gas Operator | Dec 2016 |
| 36 | McEver Oil Company Inc. | Austin, TX 78789 | Oil & Gas Operator | Mar 2008 |
| 37 | MCG Oil & Gas Operating, LLC | Archer City, TX 76351 | Oil & Gas Operator | Sep 2023 |
| 38 | McKee, Kenneth W. Oil Co. | Graham, TX 76450 | Oil & Gas Operator | Aug 2011 |
| 39 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 40 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 41 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 42 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 43 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 44 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 45 | Metis Energy LLC | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 46 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 47 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Feb 2026 |
| 48 | Milagro Exploration, LLC | Houston, TX 77010 | Oil & Gas Operator | Aug 2018 |
| 49 | Miles Production Co. | Argyle, TX 76226 | Oil & Gas Operator | Mar 2008 |
| 50 | Miller, Bob I. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 51 | Mills Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 52 | Mitchell Energy Company L.P. | Spring, TX 77387 | Oil & Gas Operator | Mar 2008 |
| 53 | Mitchell Energy Corp | Houston, TX 77002 | Oil & Gas Operator | Aug 2013 |
| 54 | MKS Consulting Corporation | Weatherford, TX 76086 | Oil & Gas Operator | Jul 2005 |
| 55 | MKS Natural Gas Company | Weatherford, TX 76086 | Oil & Gas Operator | Mar 2016 |
| 56 | Mna Enterprises LTD. Co. | Hobbs, NM 88242 | Oil & Gas Operator | Oct 2025 |
| 57 | Mobil Oil Corporation | Houston, TX 77210 | Oil & Gas Operator | Dec 2007 |
| 58 | Mobil Petro Vac, Inc. | Duncan, OK 73533 | Oil & Gas Operator | Feb 2026 |
| 59 | Mobile Petrovac, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Feb 2026 |
| 60 | Mohican Exploration, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2024 |
| 61 | Mokan Capital, LLC | Spicewood, TX 78669 | Oil Operator | Feb 2026 |
| 62 | Moller, Herbert T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 63 | Moore, Stephen Operating | Graham, TX 76450 | Oil & Gas Operator | Jun 2002 |
| 64 | Morgan, C. V. Partnership | Olney, TX 76374 | Oil & Gas Operator | Jan 2009 |
| 65 | Moriah Resources, Inc. | Midland, TX 79704 | Oil & Gas Operator | Mar 2008 |
| 66 | Mortimer Production Company | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 67 | Mosaic Oil LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 68 | Mosaic Texas LLC | Dallas, TX 75205 | Oil & Gas Operator | Feb 2026 |
| 69 | Mote Resources, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2004 |
| 70 | Mountain Creek Oil Company, Inc. | Saint Jo, TX 76265 | Oil & Gas Operator | Feb 2026 |
| 71 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 72 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Feb 2026 |
| 73 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Aug 2025 |
| 74 | Myers, A. J. | Jacksboro, TX 76458 | Oil & Gas Operator | Feb 2026 |