| 801 | Mountainside Energy Operating, LLC | Dallas, TX 75201 | Oil & Gas Operator | Sep 2026 |
| 802 | Mowata Oil Company | Victoria, TX 77903 | Oil & Gas Operator | Oct 1996 |
| 803 | Moxy Oil Company | Seguin, TX 78155 | Oil & Gas Operator | Aug 2003 |
| 804 | Moy, Gary | Falls City, TX 78113 | Oil & Gas Operator | Nov 1998 |
| 805 | Moylan, Jimmie C. | Eastland, TX 76448 | Oil & Gas Operator | Sep 2026 |
| 806 | MPG Petroleum | San Antonio, TX 78217 | Oil & Gas Operator | Aug 2003 |
| 807 | MPG Petroleum, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2026 |
| 808 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 809 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 810 | MSB Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2026 |
| 811 | MSD Operating, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Sep 2026 |
| 812 | Mse Operating Corp. | Beaverton, OR 97008 | Oil & Gas Operator | Sep 2026 |
| 813 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Sep 2026 |
| 814 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 815 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Sep 2026 |
| 816 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Sep 2026 |
| 817 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 818 | Muckleroy Gas | San Antonio, TX 78247 | Gas Operator | Sep 2026 |
| 819 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Sep 2026 |
| 820 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Sep 2026 |
| 821 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 822 | Mueller Exploration, Inc. | Humble, TX 77346 | Oil & Gas Operator | Sep 2026 |
| 823 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2026 |
| 824 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 825 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2026 |
| 826 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 827 | Mule Kick Operating LLC | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 828 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2026 |
| 829 | Muller Oil & Gas | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 830 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 831 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Sep 2026 |
| 832 | Mulloy Operating, Inc. | Midland, TX 79707 | Oil & Gas Operator | Sep 2026 |
| 833 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 834 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Sep 2026 |
| 835 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 836 | Munoco Company | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 837 | Munoz Farms Operating Co., LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Sep 2026 |
| 838 | Munoz, Magdaleno C. | Borger, TX 79007 | Oil Operator | Sep 2026 |
| 839 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2026 |
| 840 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 841 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 842 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2026 |
| 843 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 844 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 845 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 846 | Murchison Oil And Gas, LLC | Dallas, TX 75229 | Oil & Gas Operator | Feb 2025 |
| 847 | Murchison, G. B. Trust | Dallas, TX 75283 | Oil & Gas Operator | Sep 1994 |
| 848 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Jun 2026 |
| 849 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2019 |
| 850 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Sep 2026 |
| 851 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Sep 2026 |
| 852 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 853 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 854 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 855 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Sep 2026 |
| 856 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 857 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Jan 2025 |
| 858 | Murphy Oil USA, Inc. | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 859 | Murphy Production Corp. | Austin, TX 78731 | Oil & Gas Operator | Sep 2013 |
| 860 | Murphy, Bill W. Operating Co,Inc | Richardson, TX 75080 | Oil & Gas Operator | Sep 2026 |
| 861 | Murphy, K. P. Oil Operator | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 862 | Murray, Tom Enterprises | Monahans, TX 79756 | Oil & Gas Operator | Sep 2026 |
| 863 | Muskegon Development Company | MT Pleasant, MI 48858 | Oil & Gas Operator | Sep 2026 |
| 864 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 865 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 866 | Mustang Drilling, LTD. | Henderson, TX 75653 | Oil & Gas Operator | May 2008 |
| 867 | Mustang E&P LLC | Aledo, TX 76008 | Oil Operator | Sep 2026 |
| 868 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 869 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 870 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2026 |
| 871 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 872 | Mustang Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2006 |
| 873 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 874 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Sep 2026 |
| 875 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 876 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 877 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Sep 2026 |
| 878 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Sep 2026 |
| 879 | MWWD Operator, LLC | Victoria, TX 77904 | Oil Operator | Sep 2026 |
| 880 | My Hop Mineral | Moorhead, MN 56560 | Oil & Gas Operator | Sep 2026 |
| 881 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 882 | Myco Industries, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 2015 |
| 883 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Sep 2026 |
| 884 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 885 | Myers, A. J. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2026 |
| 886 | Myers, James B. | Olney, TX 76374 | Oil & Gas Operator | Sep 2026 |
| 887 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 888 | Myung And Associates, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2000 |
| 889 | MZ Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |