| 1401 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 1402 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 1403 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 1404 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Feb 2026 |
| 1405 | Metano Energy, LP | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2008 |
| 1406 | Metcalf John C Dba Metcalf Dri | Glouster, OH 45732 | Oil & Gas Operator | Dec 2006 |
| 1407 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 1408 | Meteor Developments Inc | Denver, CO BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 1409 | Meter, Erin L. & William J. | Dansville, NY 14437 | Gas Operator | Dec 2024 |
| 1410 | Metgas Co, A Partnership | | Oil & Gas Operator | Dec 2016 |
| 1411 | Methane Productions Inc | Recluse, WY 82725 | Oil & Gas Operator | Apr 2007 |
| 1412 | Metis Energy LLC | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 1413 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 1414 | Metro Energy LTD | Scottsdale, AZ 85254 | Oil Operator | Aug 2000 |
| 1415 | Metro Energy, Inc. | Gladstone, MO 64118 | Oil Operator | May 1997 |
| 1416 | Metro Oil Compan | | Oil Operator | Jan 1991 |
| 1417 | Metroplex Barnett Shale LLC | Houston, TX 77001 | Gas Operator | Sep 2008 |
| 1418 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 1419 | Mettz,Carmody & Foster Oil Co | | Oil Operator | May 1990 |
| 1420 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2024 |
| 1421 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 1422 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2024 |
| 1423 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 1424 | Mewbourne Marketing, Inc. | | Oil & Gas Operator | Mar 2013 |
| 1425 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Feb 2026 |
| 1426 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 1427 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Feb 2026 |
| 1428 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 1429 | Meyer Doyle | Marshall, OK 73056 | Oil & Gas Operator | May 2006 |
| 1430 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Nov 2025 |
| 1431 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 1432 | Meyer, David M. | South Wales, NY 14139 | Gas Operator | Dec 2024 |
| 1433 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 1434 | Meyer, Ruskin H. Et Al | | Oil Operator | Oct 1980 |
| 1435 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Sep 2025 |
| 1436 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 1437 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 1438 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 1439 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2024 |
| 1440 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Nov 2025 |
| 1441 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 1442 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 1443 | MGD Oil Production LLC | Healdton, OK 73438-6219 | Oil Operator | Nov 2025 |
| 1444 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Nov 2025 |
| 1445 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 1446 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1447 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | Feb 2026 |
| 1448 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 1449 | MGR Resources | San Antonio, TX 78209 | Oil & Gas Operator | Feb 2026 |
| 1450 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 1451 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 1452 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Feb 2026 |
| 1453 | MHW Energy LTD | Farmington, NM 87499 | Gas Operator | Mar 1995 |
| 1454 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | Feb 2026 |
| 1455 | Mi3 Energy LLC | | Oil & Gas Operator | Dec 2025 |
| 1456 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 1457 | Mica Energy Corp | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 1458 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061 | Oil & Gas Operator | Dec 2001 |
| 1459 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 1460 | Michael D Brown | | Oil Operator | Jul 1993 |
| 1461 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Sep 2025 |
| 1462 | Michael D. Weilert Oil Company | | Oil Operator | Sep 2025 |
| 1463 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Nov 2025 |
| 1464 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 1465 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 1466 | Michael Pierce | Albuquerque, NM 87191655 | Gas Operator | Mar 2022 |
| 1467 | Michael W Mills | | Oil Operator | Jul 2007 |
| 1468 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 1469 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Feb 2026 |
| 1470 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 1471 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 1472 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 1473 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Jan 2026 |
| 1474 | Michigan Oil Company | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 1475 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 1476 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |
| 1477 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 1478 | Michiwest Energy Inc | MT.Pleasant, MI 48858 | Gas Operator | Nov 2000 |
| 1479 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Dec 2025 |
| 1480 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 1481 | Micoa, Inc | | Oil & Gas Operator | Dec 2008 |
| 1482 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 1483 | Micro Operating, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Feb 2026 |
| 1484 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 1485 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 1486 | Mid America Ener | | Oil Operator | Nov 1993 |
| 1487 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 1488 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 1489 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Dec 2025 |
| 1490 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 1491 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Feb 2026 |
| 1492 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 1493 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 1494 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 1495 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 1496 | Mid Kansas Gas Gathering | | Gas Operator | Sep 2025 |
| 1497 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 1498 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 1499 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 1500 | Mid States Energ | | Oil Operator | Aug 1985 |