| 18901 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 18902 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | Dec 2025 |
| 18903 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 18904 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2024 |
| 18905 | Mead, Nathaniel E | Irving, NY 14081 | Gas Operator | Dec 2024 |
| 18906 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 18907 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 18908 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Sep 2025 |
| 18909 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 18910 | Meador Enterprises, Inc. | Kilgore, TX 75662 | Oil Operator | Oct 2023 |
| 18911 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 18912 | Meador Oil Company Inc | Lubbock, TX 79415 | Oil & Gas Operator | Oct 2022 |
| 18913 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 18914 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | Dec 2025 |
| 18915 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 18916 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Aug 2025 |
| 18917 | Meadow Deep LLC | | Oil & Gas Operator | Oct 2025 |
| 18918 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 18919 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Sep 2025 |
| 18920 | Meadowlark Operating Co | | Oil & Gas Operator | Aug 2025 |
| 18921 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 18922 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 18923 | Meadows, Kelly J | | Oil & Gas Operator | Mar 2015 |
| 18924 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |
| 18925 | Means Oil Company, LLC | Corsicana, TX 75110 | Oil & Gas Operator | Dec 2025 |
| 18926 | Means, Frank L. | Corsicana, TX 75110 | Oil & Gas Operator | Jan 2001 |
| 18927 | Mears, John C. | Chanute, KS 66720 | Oil Operator | Dec 2017 |
| 18928 | Meason Oper. Co. For Cinco Energy Corp. | | Oil & Gas Operator | Sep 2000 |
| 18929 | Meason Operating Company | Natchez, MS 39121 | Oil & Gas Operator | Dec 2011 |
| 18930 | Meb, LLC | Austin, TX 78737 | Oil Operator | Dec 2025 |
| 18931 | Mec-Goodrich Oil Co. | | Oil & Gas Operator | Feb 1985 |
| 18932 | Meco IV Holdco, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2022 |
| 18933 | Meco IV, LLC | Lakewood, CO 80227 | Oil & Gas Operator | Jul 2021 |
| 18934 | Mecom Energy Corporation | Houston, TX 77030 | Oil & Gas Operator | Jan 1999 |
| 18935 | Medallion Calif Properties Co. | | Oil & Gas Operator | Dec 2003 |
| 18936 | Medallion Energy Inc | Norman, OK 73072-7436 | Oil & Gas Operator | Aug 2004 |
| 18937 | Medallion Exploration | Holladay, UT 84117 | Oil & Gas Operator | Dec 2015 |
| 18938 | Medallion Exploration Corp. | Midvale, UT 84047 | Oil & Gas Operator | Oct 1998 |
| 18939 | Medallion Oil Company | Houston, TX 77251 | Oil & Gas Operator | Jan 2012 |
| 18940 | Medallion Petroleum, Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2015 |
| 18941 | Medallion Production Company | Tulsa, OK 74103 | Oil & Gas Operator | May 1997 |
| 18942 | Medders Oil Company | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 18943 | Medicine Bow Operating Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2014 |
| 18944 | Medina Res Dev Co LLC | Cambridge Springs, PA 16403-3447 | Oil & Gas Operator | Sep 2025 |
| 18945 | Medlen, Dean S. | Rantoul, KS 66079 | Oil Operator | Aug 1993 |
| 18946 | Medora Minerals, LLC | | Oil & Gas Operator | Oct 2025 |
| 18947 | Meeder, Curt N. | Ripley, NY 14775 | Gas Operator | Dec 2024 |
| 18948 | Meeker & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 2025 |
| 18949 | Meeker, Dan Management, Inc. | Fort Worth, TX 76107 | Oil & Gas Operator | Aug 2007 |
| 18950 | Meeks, Mike | Tulsa, OK 74136 | Oil Operator | Jan 2025 |
| 18951 | Meerkat Logistics And Operations LLC | Tuscaloosa, AL 35401 | Oil Operator | Oct 2025 |
| 18952 | Mega Drilling Company | | Oil Operator | Feb 1984 |
| 18953 | Mega Energy LLC | Gillette, WY 82718 | Gas Operator | Oct 2025 |
| 18954 | Mega Natural Gas Co | Tulsa, OK 74133 | Oil & Gas Operator | Jul 1996 |
| 18955 | Mega Petroleum C | | Oil Operator | Jun 1990 |
| 18956 | Mega Petroleum Corporation | Dallas, TX 75202 | Gas Operator | Feb 1998 |
| 18957 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 18958 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | May 2020 |
| 18959 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 18960 | Megan Oil & Gas Co., Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 18961 | Megargel Drilling Company | Megargel, TX 76370 | Oil Operator | Nov 1998 |
| 18962 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 18963 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 18964 | Mego Resources, LLC | Taft, TX 78390 | Oil & Gas Operator | Dec 2025 |
| 18965 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Dec 2025 |
| 18966 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 18967 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 18968 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 18969 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 18970 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 18971 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Dec 2025 |
| 18972 | Meleen, Catherine M. & Ruch, Jerry E. | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 18973 | Melland Drilling | | Oil Operator | Nov 1992 |
| 18974 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 18975 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | Dec 2025 |
| 18976 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 18977 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 18978 | Melren Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 18979 | Melrose Group In | | Oil Operator | Feb 1994 |
| 18980 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 18981 | Mels Water Service Inc | Lysite, WY 82642 | Oil Operator | Mar 2013 |
| 18982 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Sep 2025 |
| 18983 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 18984 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 18985 | Melton, Kenneth | Wann, OK 74083 | Oil Operator | Jun 2025 |
| 18986 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 18987 | Melvin Or Kathleen Turnbow | Portales, NM 88130 | Oil & Gas Operator | Mar 2006 |
| 18988 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 18989 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Jun 2025 |
| 18990 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 18991 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 18992 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 18993 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 18994 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 18995 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 18996 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 18997 | Meng Oper & Expl Co | | Oil & Gas Operator | Dec 1989 |
| 18998 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 18999 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 19000 | Mentren Corporation | | Gas Operator | Sep 2025 |