| 19001 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Jan 2025 |
| 19002 | Michigan Oil Co. | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 19003 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 19004 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |
| 19005 | Michigan-Wisconsin Pipe Line Co | | Oil & Gas Operator | Dec 1983 |
| 19006 | Mickalson Operating Company | Cleveland, OK 74020 | Oil & Gas Operator | May 2025 |
| 19007 | Mico Oil & Gas | Paola, KS 66071 | Oil Operator | Aug 1995 |
| 19008 | Micro Oil, LLC | Casa Grande, AZ 85193 | Oil Operator | Nov 2024 |
| 19009 | Micro Operating, Inc. | Bryan, TX 77807 | Oil & Gas Operator | Jul 2025 |
| 19010 | Micron Minerals Company | | Oil & Gas Operator | Sep 1988 |
| 19011 | Mid Amer Natural Resources Inc | Erie, PA 16505-4760 | Gas Operator | Dec 1994 |
| 19012 | Mid America Ener | | Oil Operator | Nov 1993 |
| 19013 | Mid Atlantic Oil Co | Hillsdale, MI 49242 | Oil & Gas Operator | Dec 1999 |
| 19014 | Mid Center Oil Company | | Oil & Gas Operator | Mar 2014 |
| 19015 | Mid Central Production LLC | Evanston, WY 82930 | Oil Operator | Apr 2025 |
| 19016 | Mid Con Energy Corporation | Fort Scott, KS 66701 | Oil Operator | Dec 2009 |
| 19017 | Mid Continent Resources, Inc. | Houston, TX 77060 | Oil & Gas Operator | Jul 2025 |
| 19018 | Mid East Oil Co | Indiana, PA 15701-5378 | Gas Operator | Dec 2006 |
| 19019 | Mid Field Oil Co. | | Oil & Gas Operator | Mar 1989 |
| 19020 | Mid Gulf Incorpo | | Oil & Gas Operator | Nov 1993 |
| 19021 | Mid Kansas Explo | | Oil Operator | Apr 1994 |
| 19022 | Mid Kansas Gas Gathering | | Gas Operator | Mar 2025 |
| 19023 | Mid Louisiana Gas Company | | Oil & Gas Operator | Oct 2002 |
| 19024 | Mid Michigan Gas Storage Co | | Oil & Gas Operator | Mar 2022 |
| 19025 | Mid South Oil & Gas Expl Inc | | Oil & Gas Operator | Jan 1992 |
| 19026 | Mid States Energ | | Oil Operator | Aug 1985 |
| 19027 | Mid States Gener | | Oil Operator | Apr 1988 |
| 19028 | Mid Texas Natural Gas | Kyle, TX 78640 | Oil & Gas Operator | May 2019 |
| 19029 | Mid Western Oil | | Oil Operator | Oct 1989 |
| 19030 | Mid-America Energy Company, Inc. | Lebanon, MO 65536 | Oil Operator | Jul 2003 |
| 19031 | Mid-America Resources Corporation | | Oil Operator | Jan 2019 |
| 19032 | Mid-America Resources, Inc. | | Oil & Gas Operator | Feb 2008 |
| 19033 | Mid-America/Hughes & Hughes | | Oil Operator | Jul 1984 |
| 19034 | Mid-American Hyd | | Oil & Gas Operator | Jan 1992 |
| 19035 | Mid-Con Central Expl Co | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2014 |
| 19036 | Mid-Con Energy Operating, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | May 2020 |
| 19037 | Mid-Con Energy Operating, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Jun 2025 |
| 19038 | Mid-Con Petroleum Co Inc | Heath, OH 43056 | Oil & Gas Operator | Dec 2010 |
| 19039 | Mid-Continent En | | Oil & Gas Operator | Nov 1995 |
| 19040 | Mid-Continent Energy Corp. | Wichita, KS 67208 | Oil & Gas Operator | Mar 2025 |
| 19041 | Mid-Continent Energy Operating | | Gas Operator | Aug 2007 |
| 19042 | Mid-Continent Energy Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 19043 | Mid-Continent Energy, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2020 |
| 19044 | Mid-Continent Petroleum Management Inc | Cement, OK 73017 | Oil & Gas Operator | May 2025 |
| 19045 | Mid-Continent Re | | Oil & Gas Operator | Jan 1993 |
| 19046 | Mid-Continental Exploration,Inc. | Sanger, TX 76266 | Oil & Gas Operator | Jul 2025 |
| 19047 | Mid-Eastern Oil & Gas Co. | Burton, WV 26562-0000 | Oil & Gas Operator | Dec 2021 |
| 19048 | Mid-Gulf, Inc. | Brenham, TX 77834 | Oil & Gas Operator | Mar 2008 |
| 19049 | Mid-National Resources Inc. | | Oil Operator | Feb 1999 |
| 19050 | Mid-Penn Energy Corporation | Harrisburg, PA 17101-1002 | Gas Operator | Dec 2021 |
| 19051 | Mid-South Trading, Inc. | | Oil & Gas Operator | Jan 2025 |
| 19052 | Mid-States Operating Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 19053 | Mid-Tex Energy Inc. | Costa Mesa, CA 92626 | Oil & Gas Operator | Jan 1999 |
| 19054 | Mid-Tex Operating, Inc. | Austin, TX 78748 | Oil & Gas Operator | Jul 2025 |
| 19055 | Mid-Tex Resources | Merkel, TX 79536 | Oil & Gas Operator | Feb 2001 |
| 19056 | Mid-Way Environmental Services Inc | Stroud, OK 74079 | Oil Operator | Apr 2025 |
| 19057 | Midas Resources, Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Jul 2025 |
| 19058 | Midco Energy, Inc. | | Oil & Gas Operator | Dec 1992 |
| 19059 | Midco Exploration, Inc. | Westmont, IL 60559 | Oil & Gas Operator | Mar 2025 |
| 19060 | Midcoast G & P (East Texas) L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 19061 | Midcoast Resources Co | Tulsa, OK 74136 | Oil & Gas Operator | Dec 1992 |
| 19062 | Midcon Offshore, Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 19063 | Midcontinent Acquisition Properties, Inc. | Oklahoma City, OK 73102 | Gas Operator | Jan 2000 |
| 19064 | Midcontinent Oil & Gas Company | Phoenix, AZ 85022-6180 | Oil & Gas Operator | Jun 2012 |
| 19065 | Middle Bay Oil Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 19066 | Middle Bay Production Co. Inc. | Houston, TX 77010 | Oil & Gas Operator | Sep 2014 |
| 19067 | Middle Fork Energy Uinta, LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 19068 | Middleton Oil Company | Houston, TX 77006 | Oil & Gas Operator | Jul 2025 |
| 19069 | Mideast Gas Systems, Inc. | Midland, TX 79702 | Oil & Gas Operator | Dec 2005 |
| 19070 | Midenergy Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 19071 | Midgard Energy Company | The Woodlands, TX 77380 | Oil & Gas Operator | Dec 2014 |
| 19072 | Midkiff, John | Midland, TX 79705 | Oil & Gas Operator | Mar 2008 |
| 19073 | Midla, LTD. | | Oil & Gas Operator | Jun 1990 |
| 19074 | Midland Energy, Inc. | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 19075 | Midland Oil And Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Jul 2025 |
| 19076 | Midland Oil Co | Brownsville, OH 43721 | Oil & Gas Operator | Dec 2000 |
| 19077 | Midland Operating, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2025 |
| 19078 | Midland Res. Oper. Co., Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 1998 |
| 19079 | Midland Southwest Cold Lake Inc | Midland, TX 79702 | Oil & Gas Operator | Jun 1997 |
| 19080 | Midland TMG Inc. | Midland, TX 79705 | Oil & Gas Operator | Apr 2017 |
| 19081 | Midland Workover, Inc. | | Oil & Gas Operator | Dec 2024 |
| 19082 | Midlands Gas Cor | | Gas Operator | Dec 1996 |
| 19083 | Midnight Drilling LLC | | Oil & Gas Operator | Jan 2016 |
| 19084 | Midnight Energy Operating LLC | Drumright, OK 74030 | Oil Operator | Apr 2025 |
| 19085 | Midnight Hour LLC | Enid, OK 73702 | Oil & Gas Operator | Apr 2020 |
| 19086 | Midnight Well Se | | Oil Operator | Sep 1994 |
| 19087 | Midnite Oil Co. | Wichita Falls, TX 76310 | Oil & Gas Operator | Jul 2025 |
| 19088 | Midpar L.P. | Midland, TX 79702 | Oil & Gas Operator | Feb 1995 |
| 19089 | Midroc Oil Company Et Al | | Oil Operator | Nov 1984 |
| 19090 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. | | Oil & Gas Operator | Feb 2010 |
| 19091 | Midroc Operating Co. & Watkins, H. Vaughan, Jr. & Placid Oil Co. | | Oil & Gas Operator | May 1991 |
| 19092 | Midroc Operating Company | | Oil & Gas Operator | Apr 2013 |
| 19093 | Midsco | Cross Plains, TX 76443 | Oil & Gas Operator | Jul 2025 |
| 19094 | Midstate Employment Services LLC | | Oil Operator | Apr 2024 |
| 19095 | Midstate Energy Inc | | Oil & Gas Operator | Aug 2017 |
| 19096 | Midstate Oil & Gas Company | Shawnee, OK 74801 | Oil & Gas Operator | Apr 2025 |
| 19097 | Midstates Corporation | San Antonio, TX 78217 | Oil & Gas Operator | Jul 2025 |
| 19098 | Midstates Energy Operating, LLC | FT Myers, FL 33912 | Oil Operator | Mar 2025 |
| 19099 | Midstates Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2000 |
| 19100 | Midstates Petroleum Company LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |