| 20001 | Mroz Baier, Christine | Memphis, TN 38120 | Gas Operator | Dec 2024 |
| 20002 | MRR Oil Inc. | Perryton, TX 79070 | Oil & Gas Operator | Jun 2002 |
| 20003 | Mrs. C. M. Roberson | | Oil Operator | Mar 1989 |
| 20004 | Mrs. Cecile Andries & Sons | | Oil Operator | Dec 2006 |
| 20005 | Mrs. Clara B. Guthrie | | Gas Operator | Jun 1996 |
| 20006 | MRT Exploration Co | | Oil & Gas Operator | Feb 1983 |
| 20007 | MS Producing LLC | Creston, OH 44217 | Oil & Gas Operator | Dec 2024 |
| 20008 | MS United, LLC | | Oil & Gas Operator | Sep 2025 |
| 20009 | MSB Operating | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 20010 | MSB Operating Company | Enid, OK 73703 | Oil & Gas Operator | Jan 2005 |
| 20011 | MSD Energy, Inc | Rapid City, SD 57702 | Oil & Gas Operator | Dec 2020 |
| 20012 | MSD Operating, LLC | Big Spring, TX 79721 | Oil & Gas Operator | Dec 2025 |
| 20013 | Mse Operating Corp. | Beaverton, OR 97008 | Oil & Gas Operator | Dec 2025 |
| 20014 | MSG Resources Inc. | Iola, KS 66749 | Oil Operator | Jun 2025 |
| 20015 | MSL Oil & Gas Corp | Bradford, PA 16701-0151 | Oil & Gas Operator | Dec 2024 |
| 20016 | MSN Oil, Inc. | Avoca, TX 79503 | Oil Operator | Dec 2025 |
| 20017 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 20018 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Dec 2025 |
| 20019 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 20020 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 20021 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Dec 2025 |
| 20022 | MT Savage Refractories | Pittsburgh, PA 15206-0171 | Gas Operator | Dec 2021 |
| 20023 | MT. Crescent Operating Company, LLC | | Oil & Gas Operator | Sep 2025 |
| 20024 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 20025 | MTG Operating Inc | Ridgeland, MS 39158 | Gas Operator | Apr 2011 |
| 20026 | MTM Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Jun 2025 |
| 20027 | MTN Energy | Aleppo, PA 15310 | Oil & Gas Operator | Sep 2025 |
| 20028 | MTN V Oil & Gas Inc | Indiana, PA 15701-8914 | Oil & Gas Operator | Sep 2025 |
| 20029 | Mto Oil Company | Okay, OK 74446-0354 | Oil Operator | Jul 2019 |
| 20030 | Muckleroy Gas | San Antonio, TX 78247 | Gas Operator | Dec 2025 |
| 20031 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Dec 2025 |
| 20032 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Oct 2025 |
| 20033 | Mud River Oil & Gas, LLC | Rochester, KY 42273 | Oil Operator | Dec 2023 |
| 20034 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Dec 2025 |
| 20035 | Muegge Don E | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 1996 |
| 20036 | Muegge, Clay A. | Lamont, OK 74643 | Oil Operator | Aug 1991 |
| 20037 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Oct 2025 |
| 20038 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 20039 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Dec 2025 |
| 20040 | Mueller Fred W | | Oil & Gas Operator | Dec 1995 |
| 20041 | Mueller Oil | | Oil Operator | May 2025 |
| 20042 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 20043 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 20044 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Dec 2025 |
| 20045 | Muffoletto, Michael R. | Brant, NY 14027 | Gas Operator | Dec 2024 |
| 20046 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 20047 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Dec 2025 |
| 20048 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 20049 | Muldowney Development, Inc. | Dunkirk, NY 14048 | Gas Operator | Dec 2024 |
| 20050 | Mule Kick Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 20051 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 20052 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 20053 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 20054 | Mullen Resources LLC | Reedy, WV 25270 | Oil & Gas Operator | Dec 2021 |
| 20055 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 20056 | Mullen-Hathorn-Bass | | Oil & Gas Operator | Mar 1985 |
| 20057 | Muller Oil & Gas | Wichita Falls, TX 76307 | Oil & Gas Operator | Dec 2025 |
| 20058 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 20059 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 20060 | Mullins Jimmy R Dba Southcreek Petroleum Co | Dibble, OK 73031 | Oil & Gas Operator | Jan 2021 |
| 20061 | Mullins Well Service | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2018 |
| 20062 | Mullins, John S | | Oil Operator | Nov 2014 |
| 20063 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Dec 2025 |
| 20064 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 20065 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 20066 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Dec 2025 |
| 20067 | Multiplex Resources, Inc. | Baytown, TX 77521 | Oil Operator | Dec 2009 |
| 20068 | Multistates Oil Properties, NV | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 1998 |
| 20069 | Mumford, Catherine | Waterloo, NY 13165 | Gas Operator | Dec 2024 |
| 20070 | Mumford-Gabel, Jennifer And Kyle Gabel | Lawtons, NY 14091 | Gas Operator | Dec 2024 |
| 20071 | Mumma Oil Production Co., Inc. | Allentown, PA 18109-0000 | Oil & Gas Operator | Dec 2019 |
| 20072 | Munday Operating Co., L.L.C. | | Oil & Gas Operator | May 2007 |
| 20073 | Mundell F E | Watertown, SD 57201 | Oil & Gas Operator | Aug 1994 |
| 20074 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 20075 | Munoco Co. L.C. | | Oil & Gas Operator | Jun 2003 |
| 20076 | Munoco Company | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 20077 | Munoz Farms Operating Co., LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Dec 2025 |
| 20078 | Munson Dave Company | Dallas, TX 75201-3591 | Oil Operator | Aug 1996 |
| 20079 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 20080 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 20081 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 20082 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 20083 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 20084 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 20085 | Murchison Oil & | | Oil Operator | Mar 1988 |
| 20086 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Aug 2020 |
| 20087 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 20088 | Murchison, G. B. Trust | Dallas, TX 75283 | Oil & Gas Operator | Sep 1994 |
| 20089 | Murdoch Oil Co Inc | Bluff, UT 84512 | Oil & Gas Operator | Jun 2010 |
| 20090 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Oct 2025 |
| 20091 | Murexco Petroleum Inc | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 20092 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 20093 | Murfin Drilling Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Oct 2025 |
| 20094 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Jun 2025 |
| 20095 | Murk, James M. | Wheaton, IL 60189 | Gas Operator | Jan 1999 |
| 20096 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Dec 2025 |
| 20097 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Dec 2025 |
| 20098 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 20099 | Murphrey Oil Company, Inc. | | Oil Operator | Jan 2025 |
| 20100 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |