| 18601 | Michael D. Weilert Oil Company | | Oil Operator | Feb 2026 |
| 18602 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Mar 2026 |
| 18603 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 18604 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 18605 | Michael W Mills | | Oil Operator | Jul 2007 |
| 18606 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 18607 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Jun 2026 |
| 18608 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 18609 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 18610 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 18611 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Apr 2026 |
| 18612 | Michigan Oil Company | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 18613 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 18614 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |
| 18615 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 18616 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Mar 2026 |
| 18617 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 18618 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 18619 | Micro Operating, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Jun 2026 |
| 18620 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 18621 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 18622 | Mid America Ener | | Oil Operator | Nov 1993 |
| 18623 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 18624 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 18625 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Dec 2025 |
| 18626 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 18627 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jun 2026 |
| 18628 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 18629 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 18630 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 18631 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 18632 | Mid Kansas Gas Gathering | | Gas Operator | Feb 2026 |
| 18633 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 18634 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 18635 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 18636 | Mid States Energ | | Oil Operator | Aug 1985 |
| 18637 | Mid States Gener | | Oil Operator | Apr 1988 |
| 18638 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 18639 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 18640 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 18641 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 18642 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 18643 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 18644 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 18645 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 18646 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 18647 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2026 |
| 18648 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 18649 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 18650 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Feb 2026 |
| 18651 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 18652 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2026 |
| 18653 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 18654 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Mar 2026 |
| 18655 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 18656 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Jun 2026 |
| 18657 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 18658 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 18659 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 18660 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 18661 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 18662 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 18663 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | Jun 2026 |
| 18664 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 18665 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Apr 2025 |
| 18666 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jun 2026 |
| 18667 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 18668 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Feb 2026 |
| 18669 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 18670 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 18671 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 18672 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 18673 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 18674 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 18675 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 18676 | Middleton Oil Company | Houston, TX 77006 | Oil & Gas Operator | Jun 2026 |
| 18677 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 18678 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Jun 2026 |
| 18679 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 18680 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 18681 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 18682 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jun 2026 |
| 18683 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jun 2026 |
| 18684 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 18685 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2026 |
| 18686 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 18687 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 18688 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 18689 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 18690 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 18691 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 18692 | Midnight Energy Operating LLC | Sand Springs, OK 74063 | Oil Operator | Mar 2026 |
| 18693 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 18694 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 18695 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jun 2026 |
| 18696 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 18697 | Midroc Oil Company Et Al | | Oil Operator | Nov 1984 |
| 18698 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 18699 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 18700 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |