| 18801 | Meb, LLC | Austin, TX 78737 | Oil Operator | Oct 2025 |
| 18802 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 18803 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 18804 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 18805 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 18806 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 18807 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 18808 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 18809 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 18810 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 18811 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 18812 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 18813 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Oct 2025 |
| 18814 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 18815 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Apr 2025 |
| 18816 | Medlen, Dean S. | Rantoul, KS 66079 | Oil Operator | Aug 1993 |
| 18817 | Medora Minerals, LLC | | Oil & Gas Operator | Aug 2025 |
| 18818 | Meeder, Curt N. | Ripley, NY 14775 | Gas Operator | Dec 2024 |
| 18819 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Oct 2025 |
| 18820 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 18821 | Meeks, Mike | Tulsa, OK 74136 | Oil Operator | Jan 2025 |
| 18822 | Meerkat Logistics And Operations LLC | Tuscaloosa, AL 35401 | Oil Operator | Jul 2025 |
| 18823 | Mega Drilling Company | | Oil Operator | Feb 1984 |
| 18824 | Mega Energy LLC | Gillette, WY 82718 | Gas Operator | Aug 2025 |
| 18825 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 18826 | Mega Petroleum C | | Oil Operator | Jun 1990 |
| 18827 | Mega Petroleum Corporation | Dallas, TX 75202 | Gas Operator | Feb 1998 |
| 18828 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 18829 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | May 2020 |
| 18830 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 18831 | Megan Oil & Gas Co., Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 18832 | Megargel Drilling Company | Megargel, TX 76370 | Oil Operator | Nov 1998 |
| 18833 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 18834 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 18835 | Mego Resources, LLC | Taft, TX 78390 | Oil & Gas Operator | Oct 2025 |
| 18836 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 18837 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 18838 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 18839 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 18840 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 18841 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 18842 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Oct 2025 |
| 18843 | Meleen, Catherine M. & Ruch, Jerry E. | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 18844 | Melland Drilling | | Oil Operator | Nov 1992 |
| 18845 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 18846 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | Oct 2025 |
| 18847 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 18848 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 18849 | Melren Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 18850 | Melrose Group In | | Oil Operator | Feb 1994 |
| 18851 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 18852 | Mels Water Service Inc | Lysite, WY 82642 | Oil Operator | Mar 2013 |
| 18853 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Jun 2025 |
| 18854 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 18855 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 18856 | Melton, Kenneth | Wann, OK 74083 | Oil Operator | Jun 2025 |
| 18857 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 18858 | Melvin Or Kathleen Turnbow | Portales, NM 88130 | Oil & Gas Operator | Mar 2006 |
| 18859 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18860 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Jun 2025 |
| 18861 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 18862 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 18863 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 18864 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 18865 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 18866 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 18867 | Mendell Niobrara LLC | | Oil & Gas Operator | Apr 2017 |
| 18868 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 18869 | Meng Oper. & Expl. Co. | | Oil & Gas Operator | Dec 1989 |
| 18870 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 18871 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 18872 | Mentren Corporation | | Gas Operator | Aug 2025 |
| 18873 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Jul 2025 |
| 18874 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 18875 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 18876 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 18877 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 18878 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 18879 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 18880 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 18881 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Oct 2025 |
| 18882 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 18883 | Mercury Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 18884 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 18885 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 18886 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 18887 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 18888 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 18889 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 18890 | Meridian Energy Inc. | | Oil Operator | Jun 2025 |
| 18891 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 18892 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 18893 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 18894 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 18895 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 18896 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 18897 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 18898 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 18899 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 18900 | Meridian Production Services LLC | | Oil & Gas Operator | Jun 2025 |