| 19501 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 19502 | Monfort, Roy C. | Iola, KS 66749 | Oil & Gas Operator | Sep 1989 |
| 19503 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 19504 | Mongoose Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jul 2025 |
| 19505 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 19506 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 19507 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 19508 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | May 2025 |
| 19509 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 19510 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 19511 | Monroe James | | Oil & Gas Operator | Oct 1997 |
| 19512 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Apr 2025 |
| 19513 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |
| 19514 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 19515 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 19516 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 19517 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 19518 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |
| 19519 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 19520 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 19521 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 19522 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 19523 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 19524 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 19525 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 19526 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 19527 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 19528 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 19529 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 19530 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 19531 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 19532 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 19533 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 19534 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 19535 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 19536 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 19537 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 19538 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 19539 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 19540 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |
| 19541 | Monroe Well Service-HGC | | Oil Operator | Dec 1988 |
| 19542 | Monroe Well Service-Lebo | | Oil Operator | Jun 1989 |
| 19543 | Monroe Well Service-Lexington | | Oil Operator | Feb 1989 |
| 19544 | Monroe Well Service-Newtown | | Oil Operator | Aug 1990 |
| 19545 | Monroe Well Service-Ocean | | Oil Operator | Feb 1989 |
| 19546 | Monroe Well Service-Oceanyacht | | Oil Operator | Jan 1989 |
| 19547 | Monroe Well Service-Oil City | | Oil Operator | Aug 1992 |
| 19548 | Monroe Well Service-Omega | | Oil Operator | Aug 1992 |
| 19549 | Monroe Well Service-Par | | Oil Operator | Jan 1990 |
| 19550 | Monroe Well Service-Petrol | | Oil Operator | Sep 1992 |
| 19551 | Monroe Well Service-Petrovest | | Oil Operator | Dec 1988 |
| 19552 | Monroe Well Service-PRG | | Oil Operator | Nov 1990 |
| 19553 | Monroe Well Service-Redstone | | Oil Operator | Jul 1989 |
| 19554 | Monroe Well Service-RVS | | Oil Operator | Dec 1990 |
| 19555 | Monroe Well Service-Shemen | | Oil Operator | Dec 1988 |
| 19556 | Monroe Well Service-Shemen1984 | | Oil Operator | Jan 1989 |
| 19557 | Monroe Well Service-Shemen1985 | | Oil Operator | Nov 1990 |
| 19558 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 19559 | Monroe Well Service-SPD | | Oil Operator | Dec 1988 |
| 19560 | Monroe Well Service-SPD 1985 | | Oil Operator | Dec 1988 |
| 19561 | Monroe Well Service-TBR | | Oil Operator | Aug 1991 |
| 19562 | Monroe Well Service-TG I | | Oil Operator | Oct 1990 |
| 19563 | Monroe Well Service-TG II | | Oil Operator | Oct 1990 |
| 19564 | Monroe Well Service-TG III | | Oil Operator | Jul 1992 |
| 19565 | Monroe Well Service-TG VI | | Oil Operator | Aug 1989 |
| 19566 | Monroe Well Service-Tpa 1985 | | Oil Operator | Dec 1990 |
| 19567 | Monroe Well Service-Vista | | Oil Operator | Nov 1990 |
| 19568 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 19569 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 19570 | Monroe, Cameron | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 19571 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 19572 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 19573 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 19574 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 19575 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | May 2025 |
| 19576 | Montana Energy Company, LLC | McAllen, TX 78501 | Oil & Gas Operator | Feb 2025 |
| 19577 | Montana Heartland LLC | Bismarck, ND 58504 | Oil & Gas Operator | Apr 2025 |
| 19578 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 19579 | Montana Land & Mineral Co. | Billings, MT 59105 | Gas Operator | Jan 2025 |
| 19580 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 19581 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 19582 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 19583 | Montani Energy, LLC | Smithville, WV 26178 | Gas Operator | Dec 2021 |
| 19584 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Jul 2025 |
| 19585 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Apr 2025 |
| 19586 | Montclair Production Company | Austin, TX 78755 | Oil & Gas Operator | Jul 2025 |
| 19587 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 19588 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 19589 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 19590 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 19591 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 19592 | Monterey Resources Inc. | | Oil & Gas Operator | Dec 1997 |
| 19593 | Monterey Resources LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2019 |
| 19594 | Montex Drilling Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2025 |
| 19595 | Montex Exploration | Sugarland, TX 77478 | Oil Operator | Apr 2003 |
| 19596 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 19597 | Montgomery Count | | Oil Operator | Dec 1992 |
| 19598 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2025 |
| 19599 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Jan 2025 |
| 19600 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |