| 18901 | Mills Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 18902 | Mills Oil Co. | | Oil Operator | Dec 1986 |
| 18903 | Mills, Cary | Limestone, NY 14753 | Oil & Gas Operator | Dec 2025 |
| 18904 | Mills, Donald R. & Kathleen A. | Le Roy, NY 14482 | Gas Operator | Dec 2025 |
| 18905 | Mills, H. E. | Lipan, TX 76462 | Oil & Gas Operator | Sep 2004 |
| 18906 | Mills, Norman | Lake City, KS 67071 | Oil Operator | Dec 1995 |
| 18907 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 18908 | Mills, Ralph A. | Louisburg, KS 66053 | Oil Operator | May 1998 |
| 18909 | Mills, Roger A. | Greenwood, NY 14839 | Oil & Gas Operator | Dec 2025 |
| 18910 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2026 |
| 18911 | Millwee, John F. | Midland, TX 79705 | Oil & Gas Operator | Jul 2018 |
| 18912 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 18913 | Milne Lewis Joel | Allen, OK 74825 | Oil & Gas Operator | Mar 2015 |
| 18914 | Milo-Austintatious | Houston, TX 77005 | Oil & Gas Operator | Aug 2006 |
| 18915 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Sep 2026 |
| 18916 | Milton Crow,Inc.&RP Evans Etal | | Oil & Gas Operator | Aug 1988 |
| 18917 | Milton Galoob | | Oil Operator | Dec 1988 |
| 18918 | Milton Oil & Gas Company | Charleston, WV 25322 | Gas Operator | Nov 1997 |
| 18919 | Miltuck Operating, Inc. | Elysian Field, TX 75642 | Oil & Gas Operator | Dec 1996 |
| 18920 | Mims, William S. | Pleasanton, TX 78064 | Oil Operator | Jun 2009 |
| 18921 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 18922 | Mina Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2012 |
| 18923 | Minard Run Oil Co | Bradford, PA 16701 | Oil & Gas Operator | Dec 2025 |
| 18924 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 18925 | Minco Oil And Gas Co. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2024 |
| 18926 | Minden Oil & Gas, Inc. | | Oil & Gas Operator | May 1985 |
| 18927 | Minel Inc | Richardson, TX 75080 | Oil & Gas Operator | Aug 2024 |
| 18928 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 18929 | Miner, R. C. Inc. | Corpus Christ, TX 78413 | Oil & Gas Operator | Apr 2002 |
| 18930 | Miner, R. C. Oil, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Sep 2026 |
| 18931 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 18932 | Mineral Resource Management, L.L.C. | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2021 |
| 18933 | Mineral Resources & Engineering | Aladdin, WY 82710 | Oil Operator | Jul 1991 |
| 18934 | Mineral Resources, Incorporated | Lewisville, TX 75029 | Oil & Gas Operator | Sep 2026 |
| 18935 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Sep 2026 |
| 18936 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 18937 | Minerals MGMT Group, Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2018 |
| 18938 | Minerex Engineering Corp. | | Oil & Gas Operator | Mar 2004 |
| 18939 | Minerva Oil Company | Tulsa, OK 74152-0858 | Oil & Gas Operator | Mar 2015 |
| 18940 | Minexprod LLC | Katy, TX 77494 | Oil Operator | Sep 2026 |
| 18941 | Mingo Oil Producers | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 1987 |
| 18942 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Sep 2026 |
| 18943 | Minihan Oil & Gas Corporation | Midland, TX 79704 | Oil & Gas Operator | Apr 2004 |
| 18944 | Minihan Oil & Gas LTD. | Denver, CO 80202 | Oil & Gas Operator | Jul 2006 |
| 18945 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 18946 | Minihan Production Co | Seminole, OK 74868 | Oil & Gas Operator | Jan 1997 |
| 18947 | Mink Oil Company | | Oil Operator | Nov 2003 |
| 18948 | Mink, Jay, Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Aug 2017 |
| 18949 | Minnelusa Oil LLC | Temecula, CA 92589 | Oil Operator | Feb 2002 |
| 18950 | Minner Oil Field Service | | Oil Operator | Jul 2008 |
| 18951 | Minor Jr W T | Wichita Falls, TX 76307 | Oil Operator | Nov 1998 |
| 18952 | Minor Mark | FT Worth, TX 76116-1003 | Oil Operator | Nov 2015 |
| 18953 | Mint Mining LLC | Columbus, OH 43214 | Oil Operator | Dec 2025 |
| 18954 | Minteer & Baker Gas Enterprise | Kittanning, PA 16201-5022 | Gas Operator | Dec 2025 |
| 18955 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 18956 | Minute Hand LLC | Brenham, TX 77834 | Oil & Gas Operator | Sep 2026 |
| 18957 | Minuteman Energy, LLC | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2015 |
| 18958 | Minyak Producing Company, Inc. | Sabine Pass, TX 77655 | Oil & Gas Operator | Sep 2026 |
| 18959 | Miocene Oil & Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 1998 |
| 18960 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Sep 2026 |
| 18961 | Mir-Tex Energy Corp. | Mirando City, TX 78369 | Oil & Gas Operator | Aug 2003 |
| 18962 | Miracle Petroleum LLC | | Oil & Gas Operator | Oct 2018 |
| 18963 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 18964 | Mirage Energy Inc | Eunice, NM 88231 | Oil & Gas Operator | Apr 2011 |
| 18965 | Miramar Petroleum, Inc. | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Sep 2017 |
| 18966 | Miranda Energy Corporation | Midland, TX 79705 | Oil & Gas Operator | Jun 2016 |
| 18967 | Mirando Crude Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 1994 |
| 18968 | Mirando Resource, L.L.C. | Freer, TX 78357 | Oil & Gas Operator | Sep 2026 |
| 18969 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 18970 | Misahar Investments | Evergreen, CO 80439 | Oil Operator | Dec 1992 |
| 18971 | Misc Oil Co | Oilmont, MT 59466 | Oil Operator | Jun 2026 |
| 18972 | Misener Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2010 |
| 18973 | Mishler Oil | | Oil Operator | May 1989 |
| 18974 | Miss Basin Oil & Gas Company | | Oil Operator | Jan 1985 |
| 18975 | Miss Chub LLC | | Gas Operator | Dec 2024 |
| 18976 | Miss-Lou Oil Producers Inc | | Oil & Gas Operator | Dec 1998 |
| 18977 | Miss-Lou Operating, LLC | | Oil & Gas Operator | Jun 2026 |
| 18978 | Miss-Lou Petroleum LLC | | Oil & Gas Operator | Jun 2011 |
| 18979 | Missala Inc | | Oil & Gas Operator | Dec 1995 |
| 18980 | Missaukee Oil And Gas Company LLC | | Oil & Gas Operator | May 2026 |
| 18981 | Missing Moon Oil Inc | Knox, PA 16232-4507 | Oil & Gas Operator | Dec 2025 |
| 18982 | Mission Creek Opco, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 18983 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Sep 2026 |
| 18984 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 18985 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 18986 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 18987 | Mission Oil Company | San Antonio, TX 78205 | Oil & Gas Operator | Jun 2026 |
| 18988 | Mission Resources | | Oil & Gas Operator | Dec 1991 |
| 18989 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 18990 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Sep 2026 |
| 18991 | Mississippi Resources, LLC Dba MSR Operating, LLC | | Oil & Gas Operator | May 2021 |
| 18992 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 18993 | Mississippi Valley Gas Co | | Oil & Gas Operator | Aug 1984 |
| 18994 | Mississippi Ventures | | Gas Operator | Feb 1992 |
| 18995 | Mississippi Ventures, Inc. | Granbury, TX 76048 | Gas Operator | Jul 1997 |
| 18996 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |
| 18997 | Missouri Breaks, LLC | | Oil & Gas Operator | Jun 2011 |
| 18998 | Missouri River R | | Gas Operator | Jun 1993 |
| 18999 | Missouri River Resources ND, LLC | | Oil & Gas Operator | Jun 2026 |
| 19000 | Missouri River Royalty Corporation | Bismarck, ND 58504 | Oil & Gas Operator | Jun 2026 |