| 18801 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 18802 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 18803 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 18804 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 18805 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 18806 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Jul 2025 |
| 18807 | Meleen, Catherine M. & Ruch, Jerry E. | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 18808 | Melland Drilling | | Oil Operator | Nov 1992 |
| 18809 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 18810 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | Jul 2025 |
| 18811 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 18812 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 18813 | Melren Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 18814 | Melrose Group In | | Oil Operator | Feb 1994 |
| 18815 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 18816 | Mels Water Service Inc | Lysite, WY 82642 | Oil Operator | Mar 2013 |
| 18817 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | May 2025 |
| 18818 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 18819 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 18820 | Melton, Kenneth | Wann, OK 74083 | Oil Operator | Mar 2025 |
| 18821 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 18822 | Melvin Or Kathleen Turnbow | Portales, NM 88130 | Oil & Gas Operator | Mar 2006 |
| 18823 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18824 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Mar 2025 |
| 18825 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 18826 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 18827 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2025 |
| 18828 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 18829 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 18830 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 18831 | Mendell Niobrara LLC | | Oil & Gas Operator | Apr 2017 |
| 18832 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 18833 | Meng Oper. & Expl. Co. | | Oil & Gas Operator | Dec 1989 |
| 18834 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 18835 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 18836 | Mentren Corporation | | Gas Operator | May 2025 |
| 18837 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Apr 2025 |
| 18838 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 18839 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 18840 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 18841 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 18842 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 18843 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 18844 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 18845 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Jul 2025 |
| 18846 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 18847 | Mercury Resources LLC | | Oil & Gas Operator | May 2025 |
| 18848 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 18849 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 18850 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 18851 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 18852 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 18853 | Merica Oil Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2024 |
| 18854 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 18855 | Meridian Energy Inc. | | Oil Operator | Mar 2025 |
| 18856 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 18857 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 18858 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 18859 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 18860 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 18861 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 18862 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 18863 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 18864 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 18865 | Meridian Production Services LLC | | Oil & Gas Operator | Mar 2025 |
| 18866 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 18867 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 18868 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 18869 | Meridian Resources, LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 18870 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 18871 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 18872 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jul 2025 |
| 18873 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Mar 2025 |
| 18874 | Merit Field LLC | | Oil & Gas Operator | Dec 2001 |
| 18875 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 18876 | Merit Productions | | Oil Operator | Sep 1996 |
| 18877 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 18878 | Meritage Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 18879 | Meritage Homes Of California Inc. | | Oil Operator | Dec 2020 |
| 18880 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Jul 2025 |
| 18881 | Merkin LLC | Austin, TX 78737 | Oil Operator | Jul 2025 |
| 18882 | Merl Wiggins Et Al | | Oil & Gas Operator | Sep 1996 |
| 18883 | Merlin J Verret | | Gas Operator | Jun 1986 |
| 18884 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 18885 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 18886 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 18887 | Merrick Oil & Gas | | Oil & Gas Operator | Mar 2025 |
| 18888 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 18889 | Merrico Resource | | Oil Operator | Dec 1996 |
| 18890 | Merrico Resources | | Oil Operator | Mar 1992 |
| 18891 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 18892 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 18893 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 18894 | Merrill, Brian G. | Depew, NY 14043 | Gas Operator | Dec 2024 |
| 18895 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 18896 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 18897 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | May 2025 |
| 18898 | Merritt Oil Comp | | Oil Operator | Jan 1990 |
| 18899 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Jul 2025 |
| 18900 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |