| 19301 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 19302 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 19303 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 19304 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2025 |
| 19305 | Metano Energy, LP | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2008 |
| 19306 | Metcalf John C Dba Metcalf Dri | Glouster, OH 45732 | Oil & Gas Operator | Dec 2006 |
| 19307 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 19308 | Meteor Developments Inc | Denver, CO BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 19309 | Meter, Erin L. & William J. | Dansville, NY 14437 | Gas Operator | Dec 2023 |
| 19310 | Metgas Co, A Partnership | | Oil & Gas Operator | Dec 2016 |
| 19311 | Methane Productions Inc | Recluse, WY 82725 | Oil & Gas Operator | Apr 2007 |
| 19312 | Metis Energy LLC | Friendswood, TX 77546 | Oil & Gas Operator | Apr 2025 |
| 19313 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 19314 | Metro Energy LTD | Scottsdale, AZ 85254 | Oil Operator | Aug 2000 |
| 19315 | Metro Energy, Inc. | Gladstone, MO 64118 | Oil Operator | May 1997 |
| 19316 | Metro Oil Compan | | Oil Operator | Jan 1991 |
| 19317 | Metroplex Barnett Shale LLC | Houston, TX 77001 | Gas Operator | Sep 2008 |
| 19318 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 19319 | Mettz,Carmody & Foster Oil Co | | Oil Operator | May 1990 |
| 19320 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2023 |
| 19321 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 19322 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2023 |
| 19323 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 19324 | Mewbourne Marketing Inc | Tyler, TX 75711 | Oil & Gas Operator | Mar 2013 |
| 19325 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Apr 2025 |
| 19326 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 19327 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Apr 2025 |
| 19328 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 19329 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Jan 2025 |
| 19330 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 19331 | Meyer, David M. | South Wales, NY 14139 | Gas Operator | Dec 2023 |
| 19332 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 19333 | Meyer, Ruskin H. Et Al | | Oil Operator | Oct 1980 |
| 19334 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Dec 2024 |
| 19335 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 19336 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 19337 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 19338 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2023 |
| 19339 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Jan 2025 |
| 19340 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 19341 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2024 |
| 19342 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jan 2025 |
| 19343 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 19344 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 19345 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | Apr 2025 |
| 19346 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 19347 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 19348 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 19349 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Apr 2025 |
| 19350 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | Apr 2025 |
| 19351 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 19352 | Mica Energy Corp. | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 19353 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061-1061 | Oil & Gas Operator | Dec 2001 |
| 19354 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 19355 | Michael D Brown | | Oil Operator | Jul 1993 |
| 19356 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Dec 2024 |
| 19357 | Michael D. Weilert Oil Company | | Oil Operator | Dec 2024 |
| 19358 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Jan 2025 |
| 19359 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 19360 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 19361 | Michael W Mills | | Oil Operator | Jul 2007 |
| 19362 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 19363 | Michaels, Bobby W | | Oil Operator | Nov 1998 |
| 19364 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2025 |
| 19365 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 19366 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 19367 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 19368 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Jan 2025 |
| 19369 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 19370 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 19371 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |
| 19372 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 19373 | Michiwest Energy Inc | MT.Pleasant, MI 48858 | Gas Operator | Nov 2000 |
| 19374 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 19375 | Mickalson Petroleum Company | | Oil & Gas Operator | Mar 1993 |
| 19376 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 19377 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 19378 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | Apr 2025 |
| 19379 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 19380 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 19381 | Mid America Ener | | Oil Operator | Nov 1993 |
| 19382 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 19383 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 19384 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Dec 2024 |
| 19385 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 19386 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Apr 2025 |
| 19387 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 19388 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 19389 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 19390 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 19391 | Mid Kansas Gas Gathering | | Gas Operator | Dec 2024 |
| 19392 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 19393 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 19394 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 19395 | Mid States Energ | | Oil Operator | Aug 1985 |
| 19396 | Mid States Gener | | Oil Operator | Apr 1988 |
| 19397 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19398 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 19399 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 19400 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |