| 1401 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 1402 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | May 2026 |
| 1403 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 1404 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 1405 | Micro Operating, Inc. | Tomball, TX 77375 | Oil & Gas Operator | Jul 2026 |
| 1406 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 1407 | Mid Amer Natural Resources Inc | | Gas Operator | Dec 1994 |
| 1408 | Mid America Ener | | Oil Operator | Nov 1993 |
| 1409 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 1410 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 1411 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | May 2026 |
| 1412 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 1413 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jul 2026 |
| 1414 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 1415 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 1416 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 1417 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 1418 | Mid Kansas Gas Gathering | | Gas Operator | Mar 2026 |
| 1419 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 1420 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 1421 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 1422 | Mid States Energ | | Oil Operator | Aug 1985 |
| 1423 | Mid States Gener | | Oil Operator | Apr 1988 |
| 1424 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 1425 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 1426 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 1427 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 1428 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 1429 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 1430 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 1431 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 1432 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 1433 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2026 |
| 1434 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 1435 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 1436 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Mar 2026 |
| 1437 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 1438 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | May 2026 |
| 1439 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 1440 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | May 2026 |
| 1441 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 1442 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Jul 2026 |
| 1443 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 1444 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 1445 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 1446 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 1447 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 1448 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 1449 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 1450 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | Jul 2026 |
| 1451 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 1452 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Apr 2025 |
| 1453 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2026 |
| 1454 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 1455 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Mar 2026 |
| 1456 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2026 |
| 1457 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 1458 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 1459 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 1460 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 1461 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 1462 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 1463 | Middleton Oil Company | Houston, TX 77006 | Oil & Gas Operator | Jul 2026 |
| 1464 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 1465 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2026 |
| 1466 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 1467 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 1468 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 1469 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 1470 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jul 2026 |
| 1471 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 1472 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Apr 2026 |
| 1473 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 1474 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 1475 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 1476 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 1477 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 1478 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 1479 | Midnight Energy Operating LLC | Sand Springs, OK 74063 | Oil Operator | May 2026 |
| 1480 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 1481 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 1482 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jul 2026 |
| 1483 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 1484 | Midroc Oil Company Et Al | | Oil Operator | Nov 1984 |
| 1485 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 1486 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 1487 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 1488 | Midsco | Cross Plains, TX 76443 | Oil & Gas Operator | Jul 2026 |
| 1489 | Midstar Energy Corporation | Spring, TX 77379 | Oil Operator | Jul 2026 |
| 1490 | Midstate Employment Services LLC | | Oil Operator | Apr 2024 |
| 1491 | Midstate Energy Inc | | Oil & Gas Operator | Aug 2017 |
| 1492 | Midstate Oil & Gas Company | Shawnee, OK 74801 | Oil & Gas Operator | Apr 2026 |
| 1493 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2026 |
| 1494 | Midstates Energy Operating, LLC | FT Myers, FL 33912 | Oil Operator | Mar 2026 |
| 1495 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 1496 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 1497 | Midstates Petroleum Corp. | | Oil & Gas Operator | Dec 2008 |
| 1498 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 1499 | Midway City Gas Company | Huntington, WV 25701 | Oil & Gas Operator | Dec 2018 |
| 1500 | Midway Drilling | | Oil & Gas Operator | Dec 1996 |