| 18801 | McLish, Holmes P | Denver, CO 80202 | Oil & Gas Operator | Dec 1983 |
| 18802 | McLouth Operating Company, Inc. | Kansas City, MO 64106 | Oil Operator | Aug 1999 |
| 18803 | MCM Energy Inc | Edmond, OK 73013-8035 | Oil & Gas Operator | Nov 2021 |
| 18804 | MCM Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Apr 2025 |
| 18805 | McMahon Operating Co., L.C. | Pampa, TX 79066 | Oil & Gas Operator | Dec 2004 |
| 18806 | McMahon-Bullington Drilling Co. | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 1996 |
| 18807 | McMahon-Bullington LP | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2009 |
| 18808 | McMillan, David | FT. Worth, TX 76107 | Oil Operator | Aug 2001 |
| 18809 | McMillan, L.L.C. | Sedan, KS 67361 | Oil Operator | Dec 2019 |
| 18810 | McMillen, Clay Eugene (Gene) | Chanute, KS 66720 | Oil Operator | Aug 1997 |
| 18811 | McMillin C C & Company Inc | Guthrie, OK 73044 | Oil & Gas Operator | Feb 2025 |
| 18812 | McMinn Operating Company, Inc. | Hempstead, TX 77445 | Oil & Gas Operator | May 2025 |
| 18813 | McMoran Exploration Company | | Oil & Gas Operator | May 1985 |
| 18814 | McMoran Oil & Gas LLC | New Orleans, LA 70160 | Oil & Gas Operator | Oct 2021 |
| 18815 | McMoran Production Co. | | Oil & Gas Operator | May 1985 |
| 18816 | McMoran-Transco | | Oil & Gas Operator | Aug 1979 |
| 18817 | McMullan Oil Company | San Antonio, TX 78212 | Oil & Gas Operator | Jun 2023 |
| 18818 | McMullin Well Se | | Oil & Gas Operator | Sep 1995 |
| 18819 | McMullin, Douglas | Wellsville, KS 66092 | Oil Operator | Nov 2024 |
| 18820 | McMurrey, R. J., Production Comp | Tyler, TX 75711 | Oil & Gas Operator | May 2025 |
| 18821 | McMurry Energy Company | | Oil & Gas Operator | Dec 2001 |
| 18822 | McMurry Oil LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2004 |
| 18823 | McMurtrie Oil Inc | | Oil & Gas Operator | Feb 2025 |
| 18824 | McNallen & Griffin | Keller, TX 76244 | Oil & Gas Operator | May 2025 |
| 18825 | McNallen Oil Co., Inc. | Keller, TX 76244 | Oil & Gas Operator | May 2025 |
| 18826 | McNeal Production Inc | Perry, OK 73077-0268 | Oil & Gas Operator | Nov 2014 |
| 18827 | McNeill Randy & W R | Okmulgee, OK 74447 | Oil & Gas Operator | Nov 2013 |
| 18828 | McNeish Oil Oper | | Oil & Gas Operator | Feb 1991 |
| 18829 | McNeish Oil Operations | | Oil Operator | Nov 2019 |
| 18830 | McNic Oil & Gas Midcontinent | Oklahoma City, OK 73154-0526 | Oil & Gas Operator | May 2024 |
| 18831 | McNic Oil & Gas Midcontinent,Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 1999 |
| 18832 | McNown, Carl H. | Moline, KS 67353 | Oil Operator | Jun 2021 |
| 18833 | McNutt P L | San Marcos, CA 92069-4817 | Oil & Gas Operator | Jul 1994 |
| 18834 | McO Resources Corporation | | Oil & Gas Operator | Feb 1986 |
| 18835 | McO Resources In | | Oil & Gas Operator | Apr 1987 |
| 18836 | McO Resources Integrated Corp | Houston, TX 77057 | Oil Operator | Jan 1997 |
| 18837 | McOil Montana One LLC | Vancouver, BC V6Z2W5 | Gas Operator | Jul 2024 |
| 18838 | McOil Operating Company LLC | Muskogee, OK 74401 | Oil & Gas Operator | Feb 2025 |
| 18839 | McOr Oil & Gas Corp | Houston, TX 77002 | Oil & Gas Operator | Oct 2013 |
| 18840 | McOr Oil Development, Inc. | | Oil & Gas Operator | Feb 1990 |
| 18841 | McOsker Bros., Inc. | San Antonio, TX 78264 | Oil & Gas Operator | Aug 2003 |
| 18842 | McPhaul, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | May 2025 |
| 18843 | McPhearson, Richard E. | | Oil Operator | Mar 1956 |
| 18844 | McPherson Drilling | | Oil Operator | Jun 2015 |
| 18845 | McPherson Drilling Co. | | Oil Operator | Jan 1998 |
| 18846 | MCQ Natural Gas Co Inc | Leechburg, PA 15656-0594 | Gas Operator | Dec 2012 |
| 18847 | McQuadrangle, LC | Lubbock, TX 79424 | Oil & Gas Operator | Apr 2006 |
| 18848 | McQueen Ed & Company Inc | Lindsey, OK 73052 | Oil & Gas Operator | Apr 2014 |
| 18849 | McQueen Kevin L | Newark, OH 43055 | Oil Operator | Dec 2019 |
| 18850 | McQueeney, John J. | Osawatomie, KS 66064 | Oil Operator | Jan 1985 |
| 18851 | MCR Operating Group | San Antonio, TX 78209 | Oil & Gas Operator | May 2025 |
| 18852 | MCR, LLC | Shelby, MT 59474 | Oil & Gas Operator | Feb 2025 |
| 18853 | McRae & Henry LTD | Golden, CO 80401 | Oil & Gas Operator | May 2022 |
| 18854 | McRae Exploration & Prod., Inc. | Houston, TX 77064 | Oil & Gas Operator | Feb 2017 |
| 18855 | McRae Exploration, Inc. | | Oil & Gas Operator | Mar 1984 |
| 18856 | McRae Exploration, Inc. & Epm | | Oil & Gas Operator | Mar 1978 |
| 18857 | McRae Exploration, Inc. & Herd | | Oil & Gas Operator | Mar 1984 |
| 18858 | McRae Exploration,Inc & Bec | | Oil & Gas Operator | Feb 1984 |
| 18859 | McRae Oil Corporation | | Oil & Gas Operator | Mar 1984 |
| 18860 | McRae, Nathan Rathburn | Hebbronville, TX 78361 | Oil & Gas Operator | Apr 1994 |
| 18861 | McRae, William R. | Scottsdale, AZ 85254 | Oil Operator | Aug 1995 |
| 18862 | McRain Petroleum | Weston, WV 26452-0000 | Oil & Gas Operator | Dec 2020 |
| 18863 | McShane, J. Inc. | Midland, TX 79702 | Oil & Gas Operator | Apr 2004 |
| 18864 | McWhinney Holding Company LLLP | | Oil & Gas Operator | Mar 2021 |
| 18865 | McWhorter, Jimmy L | Louisville, KY 40218 | Oil Operator | Dec 2023 |
| 18866 | MCZ Oil Co, Inc. | | Oil Operator | Feb 1994 |
| 18867 | MCZ, Inc. | Houston, TX 77026 | Oil & Gas Operator | Sep 1990 |
| 18868 | MD America Energy, LLC | Houston, TX 77224 | Oil & Gas Operator | Apr 2022 |
| 18869 | MDC Operating, Inc. | Midland, TX 79708 | Oil & Gas Operator | Oct 2022 |
| 18870 | MDC Texas Operator LLC | Midland, TX 79705 | Oil & Gas Operator | May 2025 |
| 18871 | MDF Oil Company | Floresville, TX 78114 | Oil Operator | May 2025 |
| 18872 | MDM Energy, Inc. | The Colony, TX 75056 | Oil & Gas Operator | May 2025 |
| 18873 | Mdopps, LLC | Wichita, KS 67203 | Oil Operator | Apr 2023 |
| 18874 | MDS Energy Dev LLC | Kittanning, PA 16201-4403 | Oil & Gas Operator | Mar 2025 |
| 18875 | MDS Energy Development LLC | | Oil & Gas Operator | Mar 2025 |
| 18876 | MDS Energy LTD | Kittanning, PA 16201-4403 | Gas Operator | Feb 2015 |
| 18877 | MDW Capital, Inc. | Williamstown, WV 26187 | Oil & Gas Operator | Dec 2021 |
| 18878 | Me-Tex Oil & Gas, Inc. | Hobbs, NM 88241 | Oil & Gas Operator | May 2025 |
| 18879 | Me-Tex Supply Company | Hobbs, NM 88240 | Oil & Gas Operator | Jun 1993 |
| 18880 | Me3 Oilfield Service LLC | Tulsa, OK 74136-1236 | Oil & Gas Operator | Feb 2025 |
| 18881 | Mead Oil LLC | Sheffield, PA 16347-1022 | Oil & Gas Operator | Dec 2024 |
| 18882 | Mead, Nathaniel E | Irving, NY 14081 | Gas Operator | Dec 2023 |
| 18883 | Meadco Properties | Midland, TX 79702 | Oil & Gas Operator | May 2025 |
| 18884 | Meadco Properties LTD | Midland, TX 79702 | Oil & Gas Operator | Sep 2019 |
| 18885 | Meade Energy Corporation | Oklahoma City, OK 73118-4015 | Oil & Gas Operator | Mar 2025 |
| 18886 | Meade James C | Oklahoma City, OK 73118-1544 | Gas Operator | Apr 2015 |
| 18887 | Meador Enterprises, Inc. | Kilgore, TX 75662 | Oil Operator | Oct 2023 |
| 18888 | Meador Hubbell Meador Inc | Beggs, OK 74421-0794 | Oil & Gas Operator | Apr 2020 |
| 18889 | Meador Oil Company Inc | Lubbock, TX 79415 | Oil & Gas Operator | Oct 2022 |
| 18890 | Meador, John E. | Eldorado, TX 76936 | Oil & Gas Operator | Apr 2014 |
| 18891 | Meador, T. C. | San Angelo, TX 76902 | Oil & Gas Operator | May 2025 |
| 18892 | Meadors Jr J W Trust | Bixby, OK 74008-0151 | Oil & Gas Operator | Aug 2013 |
| 18893 | Meadors Operating Co | Jennings, OK 74038-0233 | Oil Operator | Jan 2025 |
| 18894 | Meadow Deep LLC | | Oil & Gas Operator | Mar 2025 |
| 18895 | Meadow Ridge Development, LLC | Washington, PA 15301 | Oil & Gas Operator | Dec 2021 |
| 18896 | Meadowbrook Oil Corporation Of Ok Inc | Del City, OK 73115-3608 | Oil & Gas Operator | Mar 2025 |
| 18897 | Meadowlark Operating Co | | Oil & Gas Operator | Feb 2025 |
| 18898 | Meadows Jr, S. L. Production Inc. | Ravenswood, WV 26164-0022 | Oil & Gas Operator | Dec 2021 |
| 18899 | Meadows Oil Company | Plano, TX 75075 | Oil & Gas Operator | Aug 2004 |
| 18900 | Means Oil Co. | Corsicana, TX 75110 | Oil & Gas Operator | Feb 2013 |