| 19101 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Feb 2026 |
| 19102 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 19103 | Monfort, Roy C. | Iola, KS 66749 | Oil & Gas Operator | Sep 1989 |
| 19104 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 19105 | Mongoose Energy, LLC | San Antonio, TX 78209 | Oil & Gas Operator | Jun 2026 |
| 19106 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 19107 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 19108 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 19109 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | Mar 2026 |
| 19110 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 19111 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 19112 | Monroe James | | Oil & Gas Operator | Oct 1997 |
| 19113 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Mar 2026 |
| 19114 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |
| 19115 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 19116 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 19117 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 19118 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 19119 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |
| 19120 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 19121 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 19122 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 19123 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 19124 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 19125 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 19126 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 19127 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 19128 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 19129 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 19130 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 19131 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 19132 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 19133 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 19134 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 19135 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 19136 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 19137 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 19138 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 19139 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 19140 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 19141 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |
| 19142 | Monroe Well Service-HGC | | Oil Operator | Dec 1988 |
| 19143 | Monroe Well Service-Lebo | | Oil Operator | Jun 1989 |
| 19144 | Monroe Well Service-Lexington | | Oil Operator | Feb 1989 |
| 19145 | Monroe Well Service-Newtown | | Oil Operator | Aug 1990 |
| 19146 | Monroe Well Service-Ocean | | Oil Operator | Feb 1989 |
| 19147 | Monroe Well Service-Oceanyacht | | Oil Operator | Jan 1989 |
| 19148 | Monroe Well Service-Oil City | | Oil Operator | Aug 1992 |
| 19149 | Monroe Well Service-Omega | | Oil Operator | Aug 1992 |
| 19150 | Monroe Well Service-Par | | Oil Operator | Jan 1990 |
| 19151 | Monroe Well Service-Petrol | | Oil Operator | Sep 1992 |
| 19152 | Monroe Well Service-Petrovest | | Oil Operator | Dec 1988 |
| 19153 | Monroe Well Service-PRG | | Oil Operator | Nov 1990 |
| 19154 | Monroe Well Service-Redstone | | Oil Operator | Jul 1989 |
| 19155 | Monroe Well Service-RVS | | Oil Operator | Dec 1990 |
| 19156 | Monroe Well Service-Shemen | | Oil Operator | Dec 1988 |
| 19157 | Monroe Well Service-Shemen1984 | | Oil Operator | Jan 1989 |
| 19158 | Monroe Well Service-Shemen1985 | | Oil Operator | Nov 1990 |
| 19159 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 19160 | Monroe Well Service-SPD | | Oil Operator | Dec 1988 |
| 19161 | Monroe Well Service-SPD 1985 | | Oil Operator | Dec 1988 |
| 19162 | Monroe Well Service-TBR | | Oil Operator | Aug 1991 |
| 19163 | Monroe Well Service-TG I | | Oil Operator | Oct 1990 |
| 19164 | Monroe Well Service-TG II | | Oil Operator | Oct 1990 |
| 19165 | Monroe Well Service-TG III | | Oil Operator | Jul 1992 |
| 19166 | Monroe Well Service-TG VI | | Oil Operator | Aug 1989 |
| 19167 | Monroe Well Service-Tpa 1985 | | Oil Operator | Dec 1990 |
| 19168 | Monroe Well Service-Vista | | Oil Operator | Nov 1990 |
| 19169 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 19170 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 19171 | Monroe, Cameron | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 19172 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 19173 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 19174 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 19175 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 19176 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Apr 2026 |
| 19177 | Montana Energy Company, LLC | McAllen, TX 78504 | Oil & Gas Operator | Jan 2026 |
| 19178 | Montana Heartland LLC | Bismarck, ND 58504 | Oil & Gas Operator | Mar 2026 |
| 19179 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 19180 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 19181 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |
| 19182 | Montana Power Gas Company | | Oil & Gas Operator | Apr 2002 |
| 19183 | Montare Operating, LTD. | Flower Mound, TX 75022 | Oil & Gas Operator | Jun 2026 |
| 19184 | Montclair Energy LLC | Edmond, OK 73034-7291 | Oil & Gas Operator | Jan 2026 |
| 19185 | Montclair Production Company | Austin, TX 78755 | Oil & Gas Operator | Jun 2026 |
| 19186 | Montco Oil & Gas, Inc. | Pampa, TX 79066 | Oil & Gas Operator | May 1999 |
| 19187 | Monte Grande Exploration, Inc. | Cut Bank, MT 59427 | Oil Operator | Oct 2000 |
| 19188 | Montego Resources Inc | Oklahoma City, OK 73172-0192 | Oil & Gas Operator | Mar 2015 |
| 19189 | Monterey Pipeline Co. | | Oil Operator | Aug 1993 |
| 19190 | Monterey Production Company LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2026 |
| 19191 | Monterey Resources Inc. | | Oil & Gas Operator | Dec 1997 |
| 19192 | Monterey Resources LLC | Dallas, TX 75230 | Oil & Gas Operator | Oct 2019 |
| 19193 | Montex Drilling Company LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 19194 | Montex Exploration | Sugarland, TX 77478 | Oil Operator | Apr 2003 |
| 19195 | Montex Exploration Company | Houston, TX 77057 | Oil & Gas Operator | Mar 2011 |
| 19196 | Montgomery Count | | Oil Operator | Dec 1992 |
| 19197 | Montgomery Exploration Co LTD | Dallas, TX 75204-2634 | Oil & Gas Operator | Mar 2026 |
| 19198 | Montgomery Jake E | Henryetta, OK 74437 | Oil & Gas Operator | Dec 2025 |
| 19199 | Montgomery Oil & Gas Expl Inc | Tulsa, OK 74170-1884 | Oil & Gas Operator | Mar 2005 |
| 19200 | Montgomery Oil Co | | Oil Operator | Dec 2018 |