| 19401 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 19402 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 19403 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 19404 | Mid Kansas Gas Gathering | | Gas Operator | Dec 2024 |
| 19405 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 19406 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 19407 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 19408 | Mid States Energ | | Oil Operator | Aug 1985 |
| 19409 | Mid States Gener | | Oil Operator | Apr 1988 |
| 19410 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19411 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 19412 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 19413 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 19414 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 19415 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 19416 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 19417 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 19418 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 19419 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2025 |
| 19420 | Mid-Con Gas Corp | Yukon, OK 73099 | Oil & Gas Operator | Feb 2014 |
| 19421 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 19422 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 19423 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Dec 2024 |
| 19424 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 19425 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2025 |
| 19426 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 19427 | Mid-Continent Petroleum Corp | | Oil & Gas Operator | Mar 2017 |
| 19428 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | Jan 2025 |
| 19429 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 19430 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Apr 2025 |
| 19431 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 19432 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 19433 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 19434 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 19435 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 19436 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 19437 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 19438 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | Apr 2025 |
| 19439 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 19440 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Feb 2022 |
| 19441 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Apr 2025 |
| 19442 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 19443 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Dec 2024 |
| 19444 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Apr 2025 |
| 19445 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 19446 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 19447 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 19448 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 19449 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 19450 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 19451 | Middle Fork Energy Uinta, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2025 |
| 19452 | Middleton Oil Company | Houston, TX 77006 | Oil & Gas Operator | Apr 2025 |
| 19453 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 19454 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 19455 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 19456 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 19457 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 19458 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 19459 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2025 |
| 19460 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 19461 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Dec 2024 |
| 19462 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 19463 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 19464 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 19465 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 19466 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 19467 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 19468 | Midnight Energy Operating LLC | Drumright, OK 74030 | Oil Operator | Jan 2025 |
| 19469 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 19470 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 19471 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Apr 2025 |
| 19472 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 19473 | Midroc Oil Company Et Al | | Oil Operator | Nov 1984 |
| 19474 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 19475 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 19476 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 19477 | Midsco | Cross Plains, TX 76443 | Oil & Gas Operator | Apr 2025 |
| 19478 | Midstate Employment Services LLC | | Oil Operator | Apr 2024 |
| 19479 | Midstate Energy Inc | | Oil & Gas Operator | Aug 2017 |
| 19480 | Midstate Oil & Gas Company | Shawnee, OK 74801 | Oil & Gas Operator | Jan 2025 |
| 19481 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Apr 2025 |
| 19482 | Midstates Energy Operating, LLC | FT Myers, FL 33912 | Oil Operator | Nov 2024 |
| 19483 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 19484 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 19485 | Midstates Petroleum Corp. | | Oil & Gas Operator | Dec 2008 |
| 19486 | Midville Energy, LLC. | Midland, TX 79705 | Oil & Gas Operator | Jul 2024 |
| 19487 | Midway City Gas Company | Huntington, WV 25701 | Oil & Gas Operator | Dec 2018 |
| 19488 | Midway Drilling | | Oil & Gas Operator | Dec 1996 |
| 19489 | Midway Drilling Co. | Richmond, TX 77469 | Oil & Gas Operator | Apr 2025 |
| 19490 | Midway Energy, LLC | Thermopolis, WY 82443 | Oil Operator | Feb 2025 |
| 19491 | Midway Leasing Inc | Haskell, OK 74436-2406 | Oil & Gas Operator | Jan 2024 |
| 19492 | Midway Operating Co. | Great Bend, KS 67530 | Oil Operator | Jan 1998 |
| 19493 | Midway Operating Company, L.L.C. | Woodward, OK 73802 | Oil & Gas Operator | Apr 2025 |
| 19494 | Midway Production Co. | | Gas Operator | May 1990 |
| 19495 | Midway Terrel Operating Co | | Oil & Gas Operator | Dec 1999 |
| 19496 | Midway Testing Company Inc | | Gas Operator | Mar 1984 |
| 19497 | Midway-Sunset Investors LLC | | Oil & Gas Operator | Dec 2024 |
| 19498 | Midwest Energy Companies, Inc. | | Oil & Gas Operator | Feb 1998 |
| 19499 | Midwest Energy Corporation | Tulsa, OK 74105-6083 | Oil & Gas Operator | Aug 2016 |
| 19500 | Midwest Enterprises, Inc. | Cashion, OK 73016-9626 | Oil & Gas Operator | Jan 2025 |