| 19401 | Mills Oil & Gas | Jacksboro, TX 76458 | Oil & Gas Operator | Mar 2008 |
| 19402 | Mills Oil Co. | | Oil Operator | Dec 1986 |
| 19403 | Mills, Cary | Limestone, NY 14753 | Oil & Gas Operator | Dec 2024 |
| 19404 | Mills, Donald R. & Kathleen A. | Le Roy, NY 14482 | Gas Operator | Dec 2024 |
| 19405 | Mills, H. E. | Lipan, TX 76462 | Oil & Gas Operator | Sep 2004 |
| 19406 | Mills, Jay | Stephenville, TX 76401 | Gas Operator | Apr 2022 |
| 19407 | Mills, Norman | Lake City, KS 67071 | Oil Operator | Dec 1995 |
| 19408 | Mills, Pete | Midland, TX 79707 | Oil & Gas Operator | Sep 2005 |
| 19409 | Mills, Ralph A. | Louisburg, KS 66053 | Oil Operator | May 1998 |
| 19410 | Mills, Roger A. | Greenwood, NY 14839 | Oil & Gas Operator | Dec 2024 |
| 19411 | Millwee Oil, Inc. | Midland, TX 79705 | Oil & Gas Operator | Dec 2025 |
| 19412 | Millwee, John F. | Midland, TX 79705 | Oil & Gas Operator | Jul 2018 |
| 19413 | Milmac Operating Company | Lubbock, TX 79408-2976 | Oil & Gas Operator | Sep 2004 |
| 19414 | Milne Lewis Joel | Allen, OK 74825 | Oil & Gas Operator | Mar 2015 |
| 19415 | Milner Lake Energy LLC | Madison, OH 44057 | Oil & Gas Operator | Dec 2024 |
| 19416 | Milo-Austintatious | Houston, TX 77005 | Oil & Gas Operator | Aug 2006 |
| 19417 | Miltex Oil Company | Boerne, TX 78006 | Oil & Gas Operator | Dec 2025 |
| 19418 | Milton Crow,Inc.&RP Evans Etal | | Oil & Gas Operator | Aug 1988 |
| 19419 | Milton Galoob | | Oil Operator | Dec 1988 |
| 19420 | Milton Oil & Gas Company | Charleston, WV 25322 | Gas Operator | Nov 1997 |
| 19421 | Miltuck Operating, Inc. | Elysian Field, TX 75642 | Oil & Gas Operator | Dec 1996 |
| 19422 | Mims, William S. | Pleasanton, TX 78064 | Oil Operator | Jun 2009 |
| 19423 | Min-Tex Oil Corporation | Tulsa, OK 74170 | Oil & Gas Operator | Dec 1996 |
| 19424 | Mina Energy, Inc. | Boerne, TX 78006 | Oil & Gas Operator | Feb 2012 |
| 19425 | Minard Run Oil Co | Bradford, PA 16701 | Oil & Gas Operator | Dec 2024 |
| 19426 | Minatome Corpora | | Oil & Gas Operator | Sep 1987 |
| 19427 | Minco Oil And Gas Co. | Pampa, TX 79066 | Oil & Gas Operator | Aug 2024 |
| 19428 | Minden Oil & Gas, Inc. | | Oil & Gas Operator | May 1985 |
| 19429 | Minel Inc | Richardson, TX 75080 | Oil & Gas Operator | Aug 2024 |
| 19430 | Miner Rick Oil Inc | Drumright, OK 74030-0373 | Oil & Gas Operator | Apr 2022 |
| 19431 | Miner, R. C. Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 2002 |
| 19432 | Miner, R. C. Oil, Inc. | MC Queeney, TX 78123 | Oil & Gas Operator | Dec 2025 |
| 19433 | Mineral Development, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1996 |
| 19434 | Mineral Resource Management, L.L.C. | Jane Lew, WV 26378 | Oil & Gas Operator | Dec 2021 |
| 19435 | Mineral Resources & Engineering | Aladdin, WY 82710 | Oil Operator | Jul 1991 |
| 19436 | Mineral Resources, Incorporated | Lewisville, TX 75029 | Oil & Gas Operator | Dec 2025 |
| 19437 | Mineral Technologies, Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2025 |
| 19438 | Mineral Ventures, Inc. | | Oil & Gas Operator | Dec 2024 |
| 19439 | Minerals MGMT Group, Inc | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2020 |
| 19440 | Minerex Engineering Corp. | | Oil & Gas Operator | Mar 2004 |
| 19441 | Minerva Oil Company | Tulsa, OK 74152-0858 | Oil & Gas Operator | Mar 2015 |
| 19442 | Minexprod LLC | Katy, TX 77494 | Oil Operator | Dec 2025 |
| 19443 | Mingo Oil Producers | Salt Lake City, UT 84111 | Oil & Gas Operator | Nov 1987 |
| 19444 | Mingus Oil & Gas | Mingus, TX 76463 | Oil & Gas Operator | Dec 2025 |
| 19445 | Minihan Oil & Gas Corporation | Midland, TX 79704 | Oil & Gas Operator | Apr 2004 |
| 19446 | Minihan Oil & Gas LTD. | Denver, CO 80202 | Oil & Gas Operator | Jul 2006 |
| 19447 | Minihan Oil And Gas Company | Seminole, OK 74868-9790 | Oil & Gas Operator | Sep 2014 |
| 19448 | Minihan Production Co | Seminole, OK 74868 | Oil & Gas Operator | Jan 1997 |
| 19449 | Mink Oil Company | | Oil Operator | Nov 2003 |
| 19450 | Mink Richard | Cement, OK 73017 | Oil & Gas Operator | Sep 2025 |
| 19451 | Mink, Jay, Oil Co. | Electra, TX 76360 | Oil & Gas Operator | Aug 2017 |
| 19452 | Minnelusa Oil LLC | Temecula, CA 92589 | Oil Operator | Feb 2002 |
| 19453 | Minner Oil Field Service | | Oil Operator | Jul 2008 |
| 19454 | Minor Jr W T | Wichita Falls, TX 76307 | Oil Operator | Nov 1998 |
| 19455 | Minor Mark | FT Worth, TX 76116-1003 | Oil Operator | Nov 2015 |
| 19456 | Minteer & Baker Gas Enterprise | Kittanning, PA 16201-5022 | Gas Operator | Dec 2024 |
| 19457 | Minter Lee M | Bradford, PA 16701-3763 | Gas Operator | Dec 1991 |
| 19458 | Minton Oil & Gas Properties | Graford, TX 76449 | Gas Operator | Dec 2025 |
| 19459 | Minuja Oil And Gas LLC | Corpus Christi, TX 78401 | Oil & Gas Operator | Sep 1996 |
| 19460 | Minute Hand LLC | Brenham, TX 77834 | Oil & Gas Operator | Dec 2025 |
| 19461 | Minuteman Energy, LLC | Georgetown, TX 78633 | Oil & Gas Operator | Feb 2015 |
| 19462 | Minyak Producing Company, Inc. | Sabine Pass, TX 77655 | Oil & Gas Operator | Dec 2025 |
| 19463 | Miocene Oil & Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jul 1998 |
| 19464 | Miocene Oil & Gas, LTD. | Englewood, CO 80110 | Oil & Gas Operator | Dec 2025 |
| 19465 | Mir-Tex Energy Corp. | Mirando City, TX 78369 | Oil & Gas Operator | Aug 2003 |
| 19466 | Miracle Petroleum LLC | | Oil & Gas Operator | Oct 2018 |
| 19467 | Miracle Production Inc | Yukon, OK 73085-0680 | Oil & Gas Operator | Jun 2007 |
| 19468 | Mirage Energy Inc | Eunice, NM 88231 | Oil & Gas Operator | Apr 2011 |
| 19469 | Miramar Petroleum, Inc. | Corpus Chrsti, TX 78463 | Oil & Gas Operator | Sep 2017 |
| 19470 | Miranda Energy Corporation | Midland, TX 79705 | Oil & Gas Operator | Jun 2016 |
| 19471 | Mirando Crude Oil Co. | Luling, TX 78648 | Oil & Gas Operator | Jul 1994 |
| 19472 | Mirando Resource, L.L.C. | Freer, TX 78357 | Oil & Gas Operator | Dec 2025 |
| 19473 | Miresco, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jan 1995 |
| 19474 | Misahar Investments | Evergreen, CO 80439 | Oil Operator | Dec 1992 |
| 19475 | Misc Oil Co | Oilmont, MT 59466 | Oil Operator | Jul 2025 |
| 19476 | Misener Operating, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2010 |
| 19477 | Mishler Oil | | Oil Operator | May 1989 |
| 19478 | Miss Basin Oil & Gas Company | | Oil Operator | Jan 1985 |
| 19479 | Miss Chub LLC | | Gas Operator | Dec 2024 |
| 19480 | Miss-Lou Oil Producers Inc | | Oil & Gas Operator | Dec 1998 |
| 19481 | Miss-Lou Operating LLC | | Oil & Gas Operator | Sep 2025 |
| 19482 | Miss-Lou Petroleum LLC | | Oil & Gas Operator | Jun 2011 |
| 19483 | Missala Inc | | Oil & Gas Operator | Dec 1995 |
| 19484 | Missaukee Oil And Gas Company LLC | | Oil & Gas Operator | Sep 2025 |
| 19485 | Missing Moon Oil Inc | Knox, PA 16232-4507 | Oil & Gas Operator | Dec 2024 |
| 19486 | Mission Creek Opco, LLC | Magnolia, AR 71753 | Oil & Gas Operator | Jan 2025 |
| 19487 | Mission Energy Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 19488 | Mission Exploration, Inc. | Fate, TX 75132 | Oil & Gas Operator | Dec 1987 |
| 19489 | Mission Leasing LTD | Tulsa, OK 74136 | Oil Operator | Dec 2000 |
| 19490 | Mission Oil & Gas | Pawhuska, OK 74056 | Oil Operator | May 2013 |
| 19491 | Mission Oil Company | | Oil & Gas Operator | Sep 2025 |
| 19492 | Mission Resources | | Oil & Gas Operator | Dec 1991 |
| 19493 | Mission Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 19494 | Mission River Systems, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Dec 2025 |
| 19495 | Mississippi Resources, LLC Dba MSR Operating, LLC | | Oil & Gas Operator | May 2021 |
| 19496 | Mississippi River Transm. Corp | | Oil & Gas Operator | Sep 2002 |
| 19497 | Mississippi Valley Gas Co | | Oil & Gas Operator | Aug 1984 |
| 19498 | Mississippi Ventures | | Gas Operator | Feb 1992 |
| 19499 | Mississippi Ventures, Inc. | Granbury, TX 76048 | Gas Operator | Jul 1997 |
| 19500 | Missouri Basin Well Service, Inc. | Belfield, ND 58622 | Oil & Gas Operator | Jan 2018 |