| 1801 | Mobil Oil E & P Southeast Inc | | Oil & Gas Operator | Sep 2013 |
| 1802 | Mobil Oil E&P Se Inc - Pel-Tex | | Oil & Gas Operator | Dec 2005 |
| 1803 | Mobil Oil Expl & Prod S E | | Oil & Gas Operator | Dec 1979 |
| 1804 | Mobil Oil Exploration & Producing Southeast, Inc. | | Oil & Gas Operator | Jun 2026 |
| 1805 | Mobil Oil Exploration & Production North America Inc. | | Oil & Gas Operator | Dec 1996 |
| 1806 | Mobil Petro Vac, Inc. | Duncan, OK 73533 | Oil & Gas Operator | Sep 2026 |
| 1807 | Mobil Producing Texas & New Mexico | Denver City, TX 79323 | Oil & Gas Operator | Jun 2005 |
| 1808 | Mobil Producing TX. & N.M. Inc. | Spring, TX 77389 | Oil & Gas Operator | Feb 2026 |
| 1809 | Mobile Gulf, Inc. | | Oil & Gas Operator | Aug 1985 |
| 1810 | Mobile Petrovac, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |
| 1811 | Mobile Production Systems, Inc. | Austin, TX 78711 | Oil & Gas Operator | Feb 1995 |
| 1812 | Mobley & Davis | | Oil & Gas Operator | Oct 1986 |
| 1813 | Mobley & McCain | | Oil & Gas Operator | Nov 1979 |
| 1814 | Mobley & McCain, Et Al | | Oil & Gas Operator | Jul 1986 |
| 1815 | Mobley Oil Company, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1816 | Mobley Valve Service, Inc. | | Oil & Gas Operator | Nov 2006 |
| 1817 | Mobpar, Inc. | Houston, TX 77219 | Oil & Gas Operator | Sep 2026 |
| 1818 | Mobreal Oil Inc | Wilmington, DE 19808 | Oil & Gas Operator | Dec 1989 |
| 1819 | Mockingbird Oil, Inc. (I) | Spring, TX 77389 | Oil & Gas Operator | Sep 2026 |
| 1820 | Moco Oil Inc | | Oil Operator | May 1984 |
| 1821 | Moco Operating Company | | Oil & Gas Operator | Mar 2002 |
| 1822 | Mode Oil & Gasdev LTD12/21/Ofb 9-98 | | Oil & Gas Operator | May 2013 |
| 1823 | Modena Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 1824 | Modern Exploration, Inc. | Sherman, TX 75090 | Oil & Gas Operator | Sep 2026 |
| 1825 | Modus Inc. | | Oil & Gas Operator | Jul 2026 |
| 1826 | Moenning, Vernie | Electra, TX 76360 | Oil & Gas Operator | Aug 2025 |
| 1827 | Moff Oil Company | Pratt, KS 67124 | Gas Operator | Apr 1988 |
| 1828 | Moffitt W G Trust | Fort Gibson, OK 74434-4258 | Gas Operator | Nov 2019 |
| 1829 | Mogo Operating, LLC | Norman, OK 73069 | Oil & Gas Operator | Jun 2026 |
| 1830 | Mogo Reagan, LLC | Cut Bank, MT 59427 | Oil & Gas Operator | Jun 2026 |
| 1831 | Mogul Energy Corp | Los Angeles, CA 90024 | Oil & Gas Operator | Jan 2001 |
| 1832 | Mogul Energy International, Inc. | Houston, TX 77042 | Oil & Gas Operator | Oct 2017 |
| 1833 | Mogul Operating LLC | St Pete Beach, FL 33706 | Oil Operator | Sep 2026 |
| 1834 | Mogul Resources, LLC | Cisco, TX 76437 | Oil & Gas Operator | Sep 2026 |
| 1835 | Mohawk Petroleum | | Oil & Gas Operator | Jan 1995 |
| 1836 | Mohican Exploration, LLC | Graham, TX 76450 | Oil & Gas Operator | Oct 2024 |
| 1837 | Mohican Oil & Gas, L.L.C. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Apr 2013 |
| 1838 | Mohican Operating, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Apr 2021 |
| 1839 | Mohr, Steve | Maize, KS 67101 | Oil Operator | Aug 2022 |
| 1840 | Mojac Energy Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1997 |
| 1841 | Mojave Operating Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2002 |
| 1842 | Mojave Resources, LLC | New Braunfels, TX 78132 | Oil Operator | Sep 2026 |
| 1843 | Mojo Exploration & Production, LLC | Rockdale, TX 76567 | Oil Operator | Sep 2026 |
| 1844 | Mokan Capital, LLC | Spicewood, TX 78669 | Oil Operator | Sep 2026 |
| 1845 | Molder, Tom | Imperial, TX 79743 | Oil & Gas Operator | Sep 2026 |
| 1846 | Mole Hole Prod. | Bridgeport, TX 76426 | Oil Operator | Sep 2026 |
| 1847 | Mole Operating Co., Inc. | | Oil & Gas Operator | Oct 1983 |
| 1848 | Moleco, LLC | West Hills, CA 91308 | Oil Operator | Sep 2026 |
| 1849 | Moleo Gas Corp. | San Angelo, TX 76902 | Oil & Gas Operator | Apr 2018 |
| 1850 | Molitor Oil, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Apr 2026 |
| 1851 | Mollenkopf Mark | Anadarko, OK 73005 | Oil Operator | Feb 2026 |
| 1852 | Moller, Herbert T. | Wichita Falls, TX 76301 | Oil & Gas Operator | Aug 2003 |
| 1853 | Mollett Oil Productions, LLC | Thelma, KY 41260 | Oil Operator | Dec 2020 |
| 1854 | Molly Oil & Gas, LLC | Dallas, TX 75209 | Oil & Gas Operator | Sep 2026 |
| 1855 | Molopo Energy Texas, LLC | Canada, 00100 | Oil & Gas Operator | Jan 2015 |
| 1856 | Molsdorf Ag LLC | McAllen, TX 78503 | Oil Operator | Sep 2013 |
| 1857 | Molz Oil Company Inc | Kiowa, KS 67070 | Oil & Gas Operator | Jun 2026 |
| 1858 | Momentum Energy Corporation | Austin, TX 78746 | Oil & Gas Operator | Sep 2026 |
| 1859 | Momentum Energy, LLC | Midland, TX 79702 | Oil & Gas Operator | Feb 2004 |
| 1860 | Momentum Oil & Gas, LLC | The Woodlands, TX 77382 | Oil & Gas Operator | May 2015 |
| 1861 | Momentum Oil Company | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 1862 | Momentum Operating Co., Inc. | Albany, TX 76430 | Oil & Gas Operator | Sep 2026 |
| 1863 | Momentum Production Corp. | Baytown, TX 77521 | Oil & Gas Operator | Sep 2026 |
| 1864 | Moms Oil & Gas LLC | Nowata, OK 74048 | Oil & Gas Operator | May 2026 |
| 1865 | Mon Corp. | Pampa, TX 79066 | Oil & Gas Operator | Sep 2026 |
| 1866 | Mon-Oil Inc | | Oil & Gas Operator | Apr 1996 |
| 1867 | Monadnock Resources Op Co, LLC | Dallas, TX 75209 | Oil & Gas Operator | Jan 2021 |
| 1868 | Monadnock Resources, LLC | Addison, TX 75001 | Oil & Gas Operator | May 2020 |
| 1869 | Monago Operating Inc | | Oil & Gas Operator | Apr 2007 |
| 1870 | Monahan | | Oil Operator | Dec 2009 |
| 1871 | Monahan Rex | Sterling, CO 80751 | Oil & Gas Operator | Jun 2002 |
| 1872 | Monahan* Rex Family Trust | | Oil & Gas Operator | May 2007 |
| 1873 | Monarch Energy C | | Oil Operator | Nov 1987 |
| 1874 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | May 2026 |
| 1875 | Monarch Energy LLC | Paola, KS 66071 | Oil Operator | Apr 2026 |
| 1876 | Monarch Operating Company | Graham, TX 76450 | Oil & Gas Operator | Jun 2006 |
| 1877 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 1878 | Moncrief Oil | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 1879 | Moncrief R W Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1994 |
| 1880 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Jul 2026 |
| 1881 | Moncrief, C. B. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2021 |
| 1882 | Monday Creek Resources LTD | Logan, OH 43138 | Oil Operator | Dec 2025 |
| 1883 | Mondiale Energy, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Sep 2026 |
| 1884 | Mondo Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Sep 2026 |
| 1885 | Monex | | Oil Operator | Apr 1988 |
| 1886 | Monexco | Edmond, OK 73034-3776 | Oil & Gas Operator | Mar 2008 |
| 1887 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | May 2026 |
| 1888 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Apr 2026 |
| 1889 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 1890 | Monfort, Roy C. | Iola, KS 66749 | Oil & Gas Operator | Sep 1989 |
| 1891 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 1892 | Mongoose Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Sep 2026 |
| 1893 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 1894 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 1895 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 1896 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | May 2026 |
| 1897 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 1898 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 1899 | Monroe James | | Oil & Gas Operator | Oct 1997 |
| 1900 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | May 2026 |