| 801 | Mr Oil Company | Monahans, TX 79756 | Oil & Gas Operator | Nov 2004 |
| 802 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 803 | MSB Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2025 |
| 804 | MSD Operating, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Sep 2025 |
| 805 | Mse Operating Corp. | Beaverton, OR 97008 | Oil & Gas Operator | Sep 2025 |
| 806 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Sep 2025 |
| 807 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 808 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Sep 2025 |
| 809 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Sep 2025 |
| 810 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 811 | Muckleroy Gas | San Antonio, TX 78247 | Gas Operator | Sep 2025 |
| 812 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Sep 2025 |
| 813 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Sep 2025 |
| 814 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 815 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Sep 2025 |
| 816 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Sep 2025 |
| 817 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 818 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2025 |
| 819 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 820 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 821 | Muller Oil & Gas | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2025 |
| 822 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 823 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Sep 2025 |
| 824 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 825 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 826 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Sep 2025 |
| 827 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 828 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 829 | Munoz Farms Operating Co., LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Sep 2025 |
| 830 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 831 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 832 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 833 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Sep 2025 |
| 834 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 835 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 836 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | May 2024 |
| 837 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 838 | Murchison, G. B. Trust | Dallas, TX 75283 | Oil & Gas Operator | Sep 1994 |
| 839 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Jul 2025 |
| 840 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Apr 2025 |
| 841 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Sep 2025 |
| 842 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Sep 2025 |
| 843 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 844 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 845 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 846 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Sep 2025 |
| 847 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 848 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Dec 2024 |
| 849 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 850 | Murphy Production Corp. | Austin, TX 78731 | Oil & Gas Operator | Sep 2013 |
| 851 | Murphy, Bill W. Operating Co,Inc | Richardson, TX 75080 | Oil & Gas Operator | Sep 2025 |
| 852 | Murphy, K. P. Oil Operator | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2025 |
| 853 | Murray, Tom Enterprises | Monahans, TX 79756 | Oil & Gas Operator | Sep 2025 |
| 854 | Muskegon Development Company | MT Pleasant, MI 48858 | Oil & Gas Operator | Sep 2025 |
| 855 | Musselman, Owen & King Oper.,Inc | Houston, TX 77002 | Oil & Gas Operator | Feb 1998 |
| 856 | Mustang Drilling, Inc. | Henderson, TX 75653 | Oil & Gas Operator | Aug 2024 |
| 857 | Mustang Drilling, LTD. | Henderson, TX 75653 | Oil & Gas Operator | May 2008 |
| 858 | Mustang Energy Inc. | Porter, TX 77365 | Oil & Gas Operator | Mar 2008 |
| 859 | Mustang Fuel Corp. Of Oklahoma | Oklahoma City, OK 73106 | Oil & Gas Operator | Nov 2016 |
| 860 | Mustang Fuel Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Jun 2025 |
| 861 | Mustang Oil & Gas Corporation | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2021 |
| 862 | Mustang Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2006 |
| 863 | MV Purchasing LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 864 | MV2 Energy, Inc. | Houston, TX 77069 | Oil & Gas Operator | Sep 2025 |
| 865 | MW Petroleum Corporation | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 866 | MWJ Producing Company | Midland, TX 79701 | Oil & Gas Operator | Jul 1998 |
| 867 | MWL Energy LLC | Hamlin, TX 79520 | Oil Operator | Sep 2025 |
| 868 | MWS Producing, Inc. | Stanton, TX 79782 | Oil & Gas Operator | Sep 2025 |
| 869 | MWWD Operator, LLC | Victoria, TX 77904 | Oil Operator | Sep 2025 |
| 870 | My Hop Mineral | Moorhead, MN 56560 | Oil & Gas Operator | Sep 2025 |
| 871 | Myco Energy, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Dec 2003 |
| 872 | Myco Industries, Inc. | Artesia, NM 88211 | Oil & Gas Operator | Feb 2015 |
| 873 | Myco Petroleum | Lovington, NM 88260 | Oil & Gas Operator | Sep 2025 |
| 874 | Myd, Inc. | Irving, TX 75062 | Oil & Gas Operator | Mar 1998 |
| 875 | Myers, A. J. | Jacksboro, TX 76458 | Oil & Gas Operator | Sep 2025 |
| 876 | Myers, James B. | Olney, TX 76374 | Oil & Gas Operator | Sep 2025 |
| 877 | Myriad Resources Corporation | Pampa, TX 79066 | Oil & Gas Operator | Sep 2025 |
| 878 | Myung And Associates, Inc. | Houston, TX 77056 | Oil & Gas Operator | May 2000 |
| 879 | MZ Operating, Inc | Midland, TX 79701 | Oil & Gas Operator | Apr 1994 |