| 19901 | Mud River Gas Co | | Gas Operator | Dec 2021 |
| 19902 | Mud River Oil & Gas, LLC | Rochester, KY 42273 | Oil Operator | Dec 2023 |
| 19903 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Oct 2025 |
| 19904 | Muegge Don E | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 1996 |
| 19905 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Jul 2025 |
| 19906 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Jun 2025 |
| 19907 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 19908 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Oct 2025 |
| 19909 | Mueller Fred W | | Oil & Gas Operator | Dec 1995 |
| 19910 | Mueller Oil | | Oil Operator | May 2025 |
| 19911 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 19912 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 19913 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Oct 2025 |
| 19914 | Muffoletto, Michael R. | Brant, NY 14027 | Gas Operator | Dec 2024 |
| 19915 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 19916 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Oct 2025 |
| 19917 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 19918 | Muldowney Development, Inc. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 19919 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 19920 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 19921 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 19922 | Mullen Resources LLC | Reedy, WV 25270 | Oil & Gas Operator | Dec 2021 |
| 19923 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 19924 | Mullen-Hathorn-Bass | | Oil & Gas Operator | Mar 1985 |
| 19925 | Muller Oil & Gas | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 2025 |
| 19926 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 19927 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 19928 | Mullins Jimmy R Dba Southcreek Petroleum Co | Dibble, OK 73031 | Oil & Gas Operator | Jan 2021 |
| 19929 | Mullins Well Service | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2018 |
| 19930 | Mullins, John S | | Oil Operator | Nov 2014 |
| 19931 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Oct 2025 |
| 19932 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 19933 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 19934 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Oct 2025 |
| 19935 | Multiplex Resources, Inc. | Baytown, TX 77521 | Oil Operator | Dec 2009 |
| 19936 | Mumford, Catherine | Waterloo, NY 13165 | Gas Operator | Dec 2024 |
| 19937 | Mumford-Gabel, Jennifer And Kyle Gabel | Lawtons, NY 14091 | Gas Operator | Dec 2024 |
| 19938 | Mumma Oil Production Co., Inc. | Allentown, PA 18109-0000 | Oil & Gas Operator | Dec 2019 |
| 19939 | Munday Operating Co., L.L.C. | | Oil & Gas Operator | May 2007 |
| 19940 | Mundell F E | Watertown, SD 57201 | Oil & Gas Operator | Aug 1994 |
| 19941 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 19942 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 19943 | Munoco Co. L.C. | | Oil & Gas Operator | Jun 2003 |
| 19944 | Munoz Farms Operating Co., LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Oct 2025 |
| 19945 | Munoz, Magdaleno C. | Borger, TX 79007 | Oil Operator | Oct 2025 |
| 19946 | Munson Dave Company | Dallas, TX 75201-3591 | Oil Operator | Aug 1996 |
| 19947 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 19948 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 19949 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 19950 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 2025 |
| 19951 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 19952 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jun 2025 |
| 19953 | Murchison Oil & | | Oil Operator | Mar 1988 |
| 19954 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | May 2024 |
| 19955 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 19956 | Murchison Trusts | | Gas Operator | Sep 2003 |
| 19957 | Murchison, G. B. Trust | Dallas, TX 75283 | Oil & Gas Operator | Sep 1994 |
| 19958 | Murdoch Oil Co Inc | Bluff, UT 84512 | Oil & Gas Operator | Jun 2010 |
| 19959 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Aug 2025 |
| 19960 | Murexco Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 19961 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 19962 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Aug 2025 |
| 19963 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2025 |
| 19964 | Murk, James M. | Wheaton, IL 60189 | Gas Operator | Jan 1999 |
| 19965 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Oct 2025 |
| 19966 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 19967 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 19968 | Murphrey Oil Co | | Oil Operator | Jan 2025 |
| 19969 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 19970 | Murphy - Sun | | Oil & Gas Operator | May 1989 |
| 19971 | Murphy D V | | Oil Operator | Dec 1989 |
| 19972 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 19973 | Murphy Exp & Prod Co.-USA | | Oil & Gas Operator | May 2014 |
| 19974 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 19975 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 19976 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Jan 2025 |
| 19977 | Murphy Helen Colpitt Trust | Collinsville, OK 74021-0128 | Oil & Gas Operator | May 2002 |
| 19978 | Murphy Jack L | Tulsa, OK 74104-4915 | Oil Operator | Mar 2015 |
| 19979 | Murphy Oil Company Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2024 |
| 19980 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 19981 | Murphy Operating Corp | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 19982 | Murphy Prod Inc | Vanderbilt, PA 15486-1001 | Oil & Gas Operator | Dec 2024 |
| 19983 | Murphy Production Co. (Inc.) | | Oil & Gas Operator | Apr 1991 |
| 19984 | Murphy Production Corp. | Austin, TX 78731 | Oil & Gas Operator | Sep 2013 |
| 19985 | Murphy Sheldon L & Loretta | Newcastle, WY 82701 | Oil & Gas Operator | Aug 2025 |
| 19986 | Murphy, Bill W. Operating Co,Inc | Richardson, TX 75080 | Oil & Gas Operator | Oct 2025 |
| 19987 | Murphy, Charles H. | Altoona, KS 66710 | Oil Operator | Jul 2022 |
| 19988 | Murphy, Douglas S. | Sherman, NY 14781 | Gas Operator | Dec 2024 |
| 19989 | Murphy, Earl M. | Madison, KS 66860 | Oil Operator | Jun 1999 |
| 19990 | Murphy, K. P. Oil Operator | Kilgore, TX 75663 | Oil & Gas Operator | Oct 2025 |
| 19991 | Murray Hill Energy, Inc. | Bridgeport, WV 26330 | Oil & Gas Operator | Dec 2017 |
| 19992 | Murray J. Evans | | Oil Operator | Mar 1985 |
| 19993 | Murray Oil And Gas LLC | Greensburg, KS 67054 | Oil & Gas Operator | Jun 2025 |
| 19994 | Murray, Tom Enterprises | Monahans, TX 79756 | Oil & Gas Operator | Oct 2025 |
| 19995 | Murray-Teague Assoc. | | Oil Operator | Dec 2005 |
| 19996 | Murtha Contracting Inc. | Conneaut, OH 44030 | Oil & Gas Operator | Dec 2009 |
| 19997 | Murvin & Meier Oil Co. | | Oil & Gas Operator | Dec 2020 |
| 19998 | Musgrave, Dalton | | Oil Operator | Dec 2020 |
| 19999 | Musgrove Casey O | | Oil Operator | Oct 1993 |
| 20000 | Musgrove Energy Inc | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2025 |