| 19601 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 19602 | Mongoose Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Jun 2025 |
| 19603 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 19604 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 19605 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 19606 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | Apr 2025 |
| 19607 | Monroe County Water Authority | Rochester, NY 14612 | Gas Operator | Dec 2023 |
| 19608 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 19609 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 19610 | Monroe James | | Oil & Gas Operator | Oct 1997 |
| 19611 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Mar 2025 |
| 19612 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |
| 19613 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 19614 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 19615 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 19616 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 19617 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |
| 19618 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 19619 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 19620 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 19621 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 19622 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 19623 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 19624 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 19625 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 19626 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 19627 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 19628 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 19629 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 19630 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 19631 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 19632 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 19633 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 19634 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 19635 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 19636 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 19637 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 19638 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 19639 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |
| 19640 | Monroe Well Service-HGC | | Oil Operator | Dec 1988 |
| 19641 | Monroe Well Service-Lebo | | Oil Operator | Jun 1989 |
| 19642 | Monroe Well Service-Lexington | | Oil Operator | Feb 1989 |
| 19643 | Monroe Well Service-Newtown | | Oil Operator | Aug 1990 |
| 19644 | Monroe Well Service-Ocean | | Oil Operator | Feb 1989 |
| 19645 | Monroe Well Service-Oceanyacht | | Oil Operator | Jan 1989 |
| 19646 | Monroe Well Service-Oil City | | Oil Operator | Aug 1992 |
| 19647 | Monroe Well Service-Omega | | Oil Operator | Aug 1992 |
| 19648 | Monroe Well Service-Par | | Oil Operator | Jan 1990 |
| 19649 | Monroe Well Service-Petrol | | Oil Operator | Sep 1992 |
| 19650 | Monroe Well Service-Petrovest | | Oil Operator | Dec 1988 |
| 19651 | Monroe Well Service-PRG | | Oil Operator | Nov 1990 |
| 19652 | Monroe Well Service-Redstone | | Oil Operator | Jul 1989 |
| 19653 | Monroe Well Service-RVS | | Oil Operator | Dec 1990 |
| 19654 | Monroe Well Service-Shemen | | Oil Operator | Dec 1988 |
| 19655 | Monroe Well Service-Shemen1984 | | Oil Operator | Jan 1989 |
| 19656 | Monroe Well Service-Shemen1985 | | Oil Operator | Nov 1990 |
| 19657 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 19658 | Monroe Well Service-SPD | | Oil Operator | Dec 1988 |
| 19659 | Monroe Well Service-SPD 1985 | | Oil Operator | Dec 1988 |
| 19660 | Monroe Well Service-TBR | | Oil Operator | Aug 1991 |
| 19661 | Monroe Well Service-TG I | | Oil Operator | Oct 1990 |
| 19662 | Monroe Well Service-TG II | | Oil Operator | Oct 1990 |
| 19663 | Monroe Well Service-TG III | | Oil Operator | Jul 1992 |
| 19664 | Monroe Well Service-TG VI | | Oil Operator | Aug 1989 |
| 19665 | Monroe Well Service-Tpa 1985 | | Oil Operator | Dec 1990 |
| 19666 | Monroe Well Service-Vista | | Oil Operator | Nov 1990 |
| 19667 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 19668 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 19669 | Monroe, Cameron | Westfield, NY 14787 | Gas Operator | Dec 2023 |
| 19670 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 19671 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 19672 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 19673 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 19674 | Mont-Land Co. | Graham, TX 76450 | Oil & Gas Operator | Mar 2008 |
| 19675 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2025 |
| 19676 | Montana Energy Company, LLC | McAllen, TX 78501 | Oil & Gas Operator | Dec 2024 |
| 19677 | Montana Heartland LLC | Bismarck, ND 58504 | Oil & Gas Operator | Feb 2025 |
| 19678 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 19679 | Montana Land & Mineral Co. | Billings, MT 59105 | Gas Operator | Jan 2025 |
| 19680 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 19681 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 19682 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 19683 | Montani Energy, LLC | Smithville, WV 26178 | Gas Operator | Dec 2021 |
| 19684 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Jun 2025 |
| 19685 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Mar 2025 |
| 19686 | Montclair Production Company | Austin, TX 78755 | Oil & Gas Operator | Jun 2025 |
| 19687 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 19688 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 19689 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 19690 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 19691 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2025 |
| 19692 | Monterey Resources Inc. | | Oil & Gas Operator | Dec 1997 |
| 19693 | Monterey Resources LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2019 |
| 19694 | Montex Drilling Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2025 |
| 19695 | Montex Exploration | Sugarland, TX 77478 | Oil Operator | Apr 2003 |
| 19696 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 19697 | Montgomery Count | | Oil Operator | Dec 1992 |
| 19698 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2025 |
| 19699 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 19700 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |