| 6801 | Mastodon Operating Company, LLC | Houston, TX 77027 | Oil & Gas Operator | Apr 2026 |
| 6802 | Matador Drilling Corp. | Midland, TX 79708 | Oil & Gas Operator | Mar 1995 |
| 6803 | Matador Operating Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2003 |
| 6804 | Matador Operating, LLC | Lubbock, TX 79413 | Oil Operator | Oct 2024 |
| 6805 | Matador Production Company | Dallas, TX 75240 | Oil & Gas Operator | Apr 2026 |
| 6806 | Matco Oil Co. | Saratoga, TX 77585 | Oil & Gas Operator | Apr 1999 |
| 6807 | Mathis & Sons, Inc. | Rule, TX 79547 | Oil & Gas Operator | Apr 2026 |
| 6808 | Mathis, Bill | Midland, TX 79702 | Oil & Gas Operator | Nov 2001 |
| 6809 | Matrix Petroleum, LLC | Houston, TX 77077 | Oil & Gas Operator | Apr 2026 |
| 6810 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 6811 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Feb 2026 |
| 6812 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 6813 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 6814 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Apr 2026 |
| 6815 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2026 |
| 6816 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 6817 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil & Gas Operator | Apr 2026 |
| 6818 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Apr 2026 |
| 6819 | Maverick Oil Company LLC | Pasadena, TX 77505 | Oil Operator | Apr 2026 |
| 6820 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 6821 | Maverick Permian LLC | Keithville, LA 71047 | Oil & Gas Operator | Apr 2026 |
| 6822 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Apr 2026 |
| 6823 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 6824 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 6825 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 6826 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Feb 2026 |
| 6827 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 6828 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 6829 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 6830 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 6831 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 6832 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 6833 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 6834 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 6835 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 6836 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 6837 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Apr 2026 |
| 6838 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 6839 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Apr 2026 |
| 6840 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Apr 2026 |
| 6841 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Apr 2026 |
| 6842 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 6843 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 6844 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 6845 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Apr 2026 |
| 6846 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Apr 2026 |
| 6847 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 6848 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 6849 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Apr 2026 |
| 6850 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Apr 2026 |
| 6851 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 6852 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 6853 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 6854 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Apr 2026 |
| 6855 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Apr 2026 |
| 6856 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Aug 2025 |
| 6857 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 6858 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Apr 2026 |
| 6859 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 6860 | McAnear Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Dec 2002 |
| 6861 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 6862 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 6863 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Apr 2026 |
| 6864 | McBee, Jim Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2012 |
| 6865 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |
| 6866 | McBride Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2026 |
| 6867 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 6868 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 6869 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Apr 2026 |
| 6870 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2026 |
| 6871 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 6872 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 6873 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 6874 | McCarthy Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2007 |
| 6875 | McCauley Production | Graham, TX 76450 | Oil Operator | Apr 2026 |
| 6876 | McCauley, F. R. | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 6877 | McClelland Creek Properties,Inc. | Pampa, TX 79066 | Oil & Gas Operator | Apr 2026 |
| 6878 | McClure Brothers | Denton, TX 76210 | Oil & Gas Operator | Apr 2026 |
| 6879 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 6880 | McClure, J.D. Trust | Denton, TX 76209 | Oil & Gas Operator | Apr 2026 |
| 6881 | McClymond, B. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2020 |
| 6882 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 6883 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 6884 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 6885 | McCombs Energy, LTD. | Houston, TX 77056 | Oil & Gas Operator | Aug 2017 |
| 6886 | McCommons Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Apr 2026 |
| 6887 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Jan 2026 |
| 6888 | McCormack, Lowell Ray | Gainesville, TX 76240 | Oil & Gas Operator | Dec 1993 |
| 6889 | McCormack, Paul H. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2003 |
| 6890 | McCormick Operating, L.L.C. | Olney, TX 76374 | Oil Operator | Sep 2015 |
| 6891 | McCormick Production Co, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Apr 2026 |
| 6892 | McCown Engineering | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2026 |
| 6893 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Feb 2026 |
| 6894 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2026 |
| 6895 | McCrary & Franklin, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2012 |
| 6896 | McCrary Oil Company, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Sep 2019 |
| 6897 | McCrea Exploration Company, Inc. | Carrollton, TX 75007 | Oil & Gas Operator | Nov 1995 |
| 6898 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Feb 2026 |
| 6899 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 6900 | McCurdy Energy LLC | Midland, TX 79707 | Oil Operator | Sep 2025 |