| 18901 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | May 2025 |
| 18902 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 18903 | Mears, John C. | Chanute, KS 66720 | Oil Operator | Dec 2017 |
| 18904 | Meason Oper. Co. For Cinco Energy Corp. | | Oil & Gas Operator | Sep 2000 |
| 18905 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 18906 | Meb, LLC | Austin, TX 78737 | Oil Operator | May 2025 |
| 18907 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 18908 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 18909 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 18910 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 18911 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 18912 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 18913 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 18914 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 18915 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 18916 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 18917 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 18918 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | May 2025 |
| 18919 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 18920 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Feb 2025 |
| 18921 | Medlen, Dean S. | Rantoul, KS 66079 | Oil Operator | Aug 1993 |
| 18922 | Medora Minerals, LLC | | Oil & Gas Operator | Mar 2025 |
| 18923 | Meeder, Curt N. | Ripley, NY 14775 | Gas Operator | Dec 2023 |
| 18924 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 2025 |
| 18925 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 18926 | Meeks, Mike | El Dorado, AR 71730 | Oil Operator | Jan 2025 |
| 18927 | Meerkat Logistics And Operations LLC | Tuscaloosa, AL 35401 | Oil Operator | Apr 2025 |
| 18928 | Mega Drilling Company | | Oil Operator | Feb 1984 |
| 18929 | Mega Energy LLC | Gillette, WY 82718 | Gas Operator | Mar 2025 |
| 18930 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 18931 | Mega Petroleum C | | Oil Operator | Jun 1990 |
| 18932 | Mega Petroleum Corporation | Dallas, TX 75202 | Gas Operator | Feb 1998 |
| 18933 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 18934 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | Sep 2019 |
| 18935 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 18936 | Megan Oil & Gas Co., Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 18937 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 18938 | Megg, L.P. | Borger, TX 79007 | Oil & Gas Operator | May 2025 |
| 18939 | Mego Resources, LLC | Taft, TX 78390 | Oil & Gas Operator | May 2025 |
| 18940 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | May 2025 |
| 18941 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 18942 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 18943 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 18944 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 18945 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 18946 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | May 2025 |
| 18947 | Meleen, Catherine M. & Ruch, Jerry E. | Westfield, NY 14787 | Gas Operator | Dec 2023 |
| 18948 | Melland Drilling | | Oil Operator | Nov 1992 |
| 18949 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 18950 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | May 2025 |
| 18951 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 18952 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 18953 | Melren Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 18954 | Melrose Group In | | Oil Operator | Feb 1994 |
| 18955 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 18956 | Mels Water Service Inc | Lysite, WY 82642 | Oil Operator | Mar 2013 |
| 18957 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Mar 2025 |
| 18958 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 18959 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 18960 | Melton, Kenneth | Wann, OK 74083 | Oil Operator | Jan 2025 |
| 18961 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 18962 | Melvin Or Kathleen Turnbow | Portales, NM 88130 | Oil & Gas Operator | Mar 2006 |
| 18963 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18964 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Jan 2025 |
| 18965 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 18966 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 18967 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | May 2025 |
| 18968 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 18969 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 18970 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 18971 | Mendell Niobrara LLC | | Oil & Gas Operator | Apr 2017 |
| 18972 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 18973 | Meng Oper. & Expl. Co. | | Oil & Gas Operator | Dec 1989 |
| 18974 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 18975 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 18976 | Mentren Corporation | | Gas Operator | Mar 2025 |
| 18977 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Mar 2025 |
| 18978 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 18979 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 18980 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 18981 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 18982 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 18983 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 18984 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 18985 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | May 2025 |
| 18986 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 18987 | Mercury Resources LLC | | Oil & Gas Operator | Mar 2025 |
| 18988 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 18989 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 18990 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 18991 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 18992 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 18993 | Merica Oil Operating Company | Frisco, TX 75034 | Oil & Gas Operator | Sep 2024 |
| 18994 | Merica Oil Operating Company LLC | Frisco, TX 75034 | Oil Operator | Dec 2024 |
| 18995 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 18996 | Meridian Energy Inc. | | Oil Operator | Jan 2025 |
| 18997 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 18998 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 18999 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 19000 | Meridian Oil & Gas Enter | Blairsville, PA 15717-0337-0337 | Oil & Gas Operator | Dec 2004 |