| 6901 | Matrix Producing Company | Luling, TX 78648 | Oil & Gas Operator | Feb 2005 |
| 6902 | Matrix Production Company | Sugar Land, TX 77478 | Oil & Gas Operator | Oct 2025 |
| 6903 | Mattox, J. R. | Jacksboro, TX 76458 | Oil Operator | Mar 2018 |
| 6904 | Maverick Drilling Co., Inc. | Austin, TX 78729 | Oil & Gas Operator | Mar 2015 |
| 6905 | Maverick Energy & Dev. Corp. | Austin, TX 78746 | Oil & Gas Operator | Dec 2025 |
| 6906 | Maverick Energy Group, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 6907 | Maverick Expl. & Drilling Co. | Richland, TX 76681 | Oil & Gas Operator | Aug 2003 |
| 6908 | Maverick Mudlogging | Eagle Pass, TX 78852 | Oil Operator | Dec 2025 |
| 6909 | Maverick Oil Co. | Richland, TX 76681 | Oil Operator | Dec 2025 |
| 6910 | Maverick Oil Company LLC | Pasadena, TX 77505 | Oil Operator | Dec 2025 |
| 6911 | Maverick Operating, LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 6912 | Maverick Permian LLC | Keithville, LA 71047 | Oil & Gas Operator | Dec 2025 |
| 6913 | Maverick Prod. Co., Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 6914 | Maverick Production | Nocona, TX 76255 | Oil & Gas Operator | May 2007 |
| 6915 | Maverick Properties, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Sep 1994 |
| 6916 | Maxey & Swan Oil Co. | Decatur, TX 76234 | Oil & Gas Operator | Apr 2007 |
| 6917 | Maxim Energy Corporation | Baytown, TX 77520 | Oil & Gas Operator | Aug 2025 |
| 6918 | Maxima Energy Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2012 |
| 6919 | Maximus Operating, LTD. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 6920 | Maxum Energy Corp | Plano, TX 75025 | Oil & Gas Operator | Jan 2003 |
| 6921 | Maxus Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Jan 1995 |
| 6922 | Maxwell Oil & Gas Corp. | Kilgore, TX 75663 | Oil & Gas Operator | Jan 2001 |
| 6923 | Maxwell Resources Corporation | Oklahoma City, OK 73159 | Oil & Gas Operator | Apr 2009 |
| 6924 | Maxwell, J. K. | Kilgore, TX 75662 | Oil & Gas Operator | Aug 1995 |
| 6925 | Maxwell, Richard | Wichita Falls, TX 76301 | Oil & Gas Operator | May 1995 |
| 6926 | Maxwell, Riley G., Co. | Abilene, TX 79604 | Oil & Gas Operator | Jan 2000 |
| 6927 | May Investments, Inc. | New Boston, TX 75570 | Oil & Gas Operator | Aug 2003 |
| 6928 | Mayco Oil | Nocona, TX 76255 | Oil & Gas Operator | Dec 2025 |
| 6929 | Mayes Operating Co. | Stephenville, TX 76401 | Oil & Gas Operator | Oct 2019 |
| 6930 | Mayfield Energy, LLC | Austin, TX 78732 | Oil & Gas Operator | Dec 2025 |
| 6931 | Mayfield Engineering Service | Tulsa, OK 74104 | Oil & Gas Operator | Dec 2025 |
| 6932 | Mayjac I, LLC | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 6933 | Maynard Oil Co. | Denver, CO 80202 | Oil & Gas Operator | Sep 2004 |
| 6934 | Mayne & Mertz, Inc. | Midland, TX 79702 | Oil & Gas Operator | Mar 2013 |
| 6935 | Mayo Oil Co. | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2019 |
| 6936 | Mayo, Danny | Whitesboro, TX 76273 | Oil & Gas Operator | Dec 2025 |
| 6937 | Mayo, Eddie | Fredericksbrg, TX 78624 | Oil & Gas Operator | Dec 2025 |
| 6938 | Mayo, Keith | Wichita Falls, TX 76301 | Oil & Gas Operator | Sep 2009 |
| 6939 | Mayo, Paul R. | Quinlan, TX 75474 | Oil & Gas Operator | May 1999 |
| 6940 | Mays Enterprises, Inc. | Mineral Wells, TX 76067 | Gas Operator | Oct 2010 |
| 6941 | Mazco Energy LLC | San Antonio, TX 78266 | Oil & Gas Operator | Dec 2025 |
| 6942 | Mazel Oil & Gas Co. | Austin, TX 78768 | Gas Operator | Jan 1994 |
| 6943 | MB Energy, LLC | San Antonio, TX 78233 | Oil & Gas Operator | Dec 2025 |
| 6944 | MB Exploration, LLC | Dallas, TX 75380 | Oil & Gas Operator | Jul 2008 |
| 6945 | MB Operating | Wichita Falls, TX 76309 | Oil & Gas Operator | Mar 2008 |
| 6946 | MBC Operating Co., Inc. | Garland, TX 75042 | Oil & Gas Operator | Aug 1993 |
| 6947 | MBR Resources, Inc. | Tulsa, OK 74119 | Oil & Gas Operator | Dec 2025 |
| 6948 | MBX Operating LLC | Houston, TX 77007 | Oil & Gas Operator | Dec 2025 |
| 6949 | MC Glover, LLC | Albany, TX 76430 | Oil Operator | Dec 2025 |
| 6950 | MC Panhandle, Inc. | Tulsa, OK 74102 | Gas Operator | Jul 1998 |
| 6951 | MC1 Consulting, Inc. | San Antonio, TX 78209 | Oil Operator | Sep 2025 |
| 6952 | McA Petroleum Corporation | Flatonia, TX 78941 | Oil & Gas Operator | Dec 2025 |
| 6953 | McAlester Fuel Co. | Houston, TX 77042 | Oil & Gas Operator | Jan 2010 |
| 6954 | McAnear Oil & Gas | Freer, TX 78357 | Oil & Gas Operator | Dec 2002 |
| 6955 | McBay Company | Grapeland, TX 75844 | Oil & Gas Operator | Feb 2002 |
| 6956 | McBee Company, The | Dallas, TX 75219 | Oil & Gas Operator | Dec 1997 |
| 6957 | McBee Operating Company, L.L.C. | Dallas, TX 75209 | Oil & Gas Operator | Dec 2025 |
| 6958 | McBee, Jim Co. | Santa Anna, TX 76878 | Oil & Gas Operator | Mar 2012 |
| 6959 | McBrayer Oil Corporation | Rockport, TX 78381 | Oil & Gas Operator | Nov 1994 |
| 6960 | McBride Operating LLC | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 6961 | McBride Production Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | May 1993 |
| 6962 | McBride, Jerrel L Enterprise Inc | Kilgore, TX 75663 | Oil & Gas Operator | Jun 1999 |
| 6963 | McCabe Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Aug 2009 |
| 6964 | McCamey Oil And Gas LLC | MC Camey, TX 79752 | Oil Operator | Dec 2025 |
| 6965 | McCammon Oil & Gas, Inc. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 6966 | McCann Corporation | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 6967 | McCarter, A. Nelson | Houston, TX 77063 | Oil & Gas Operator | Aug 2003 |
| 6968 | McCarter, W. B. Jr. | Houston, TX 77063 | Oil & Gas Operator | Feb 2002 |
| 6969 | McCarthy Oil & Gas Corporation | Houston, TX 77056 | Oil & Gas Operator | Oct 2007 |
| 6970 | McCauley Production | Graham, TX 76450 | Oil Operator | Dec 2025 |
| 6971 | McCauley, F. R. | Houston, TX 77002 | Oil & Gas Operator | Apr 2000 |
| 6972 | McClelland Creek Properties,Inc. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 6973 | McClure Brothers | Denton, TX 76210 | Oil & Gas Operator | Dec 2025 |
| 6974 | McClure Oil Company, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 6975 | McClure, J.D. Trust | Denton, TX 76209 | Oil & Gas Operator | Dec 2025 |
| 6976 | McClymond, B. W. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2020 |
| 6977 | McClymond, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2001 |
| 6978 | McClymond, LTD. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2009 |
| 6979 | McCombs Energy LLC | Houston, TX 77056 | Oil & Gas Operator | Jan 2006 |
| 6980 | McCombs Energy, LTD. | Houston, TX 77056 | Oil & Gas Operator | Aug 2017 |
| 6981 | McCommons Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 6982 | McCool John E | Youngsville, PA 16371 | Oil & Gas Operator | Sep 2025 |
| 6983 | McCormack, Lowell Ray | Gainesville, TX 76240 | Oil & Gas Operator | Dec 1993 |
| 6984 | McCormack, Paul H. | Gainesville, TX 76241 | Oil & Gas Operator | Sep 2003 |
| 6985 | McCormick Operating, L.L.C. | Olney, TX 76374 | Oil Operator | Sep 2015 |
| 6986 | McCormick Production Co, Inc. | Oil City, LA 71061 | Oil & Gas Operator | Dec 2025 |
| 6987 | McCown Engineering | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2025 |
| 6988 | McCoy Petroleum Corporation | Wichita, KS 67207 | Oil & Gas Operator | Oct 2025 |
| 6989 | McCracken, H. L. Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 6990 | McCrary & Franklin, Inc. | Post, TX 79356 | Oil & Gas Operator | May 2012 |
| 6991 | McCrary Oil Company, Inc. | College Sta, TX 77840 | Oil & Gas Operator | Sep 2019 |
| 6992 | McCrea Exploration Company, Inc. | Carrollton, TX 75007 | Oil & Gas Operator | Nov 1995 |
| 6993 | McCullis Resources Co., Inc. | Littleton, CO 80161 | Oil & Gas Operator | Aug 2025 |
| 6994 | McCulliss Resources Co Inc | Littleton, CO 80161-3248 | Oil & Gas Operator | Jun 2009 |
| 6995 | McCurdy Energy LLC | Midland, TX 79707 | Oil Operator | Dec 2025 |
| 6996 | McCurdy Oil Co. | Fort Worth, TX 76116 | Oil & Gas Operator | Jan 2025 |
| 6997 | McCutchin Petroleum Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 6998 | McCutchin, Gene | Dallas, TX 75380 | Oil & Gas Operator | Aug 2003 |
| 6999 | McCutchin, Jerry | Dallas, TX 75380 | Oil & Gas Operator | Mar 2008 |
| 7000 | MCD, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | Aug 2003 |