| 19301 | Monago Operating Inc | | Oil & Gas Operator | Mar 2017 |
| 19302 | Monahan | | Oil Operator | Dec 2009 |
| 19303 | Monahan Rex | Sterling, CO 80751 | Oil & Gas Operator | Jun 2002 |
| 19304 | Monahan* Rex Family Trust | | Oil & Gas Operator | Sep 2010 |
| 19305 | Monarch Energy C | | Oil Operator | Nov 1987 |
| 19306 | Monarch Energy Company LLC | Eufaula, OK 74432 | Oil & Gas Operator | Sep 2024 |
| 19307 | Monarch Energy LLC | Paola, KS 66071 | Oil Operator | Jul 2024 |
| 19308 | Monarch Petroleum Corporation | FT Worth, TX 76102 | Oil & Gas Operator | Dec 2019 |
| 19309 | Moncrief Oil | Casper, WY 82602 | Oil & Gas Operator | Feb 1986 |
| 19310 | Moncrief R W Inc | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1994 |
| 19311 | Moncrief W A Jr | Fort Worth, TX 76102 | Oil & Gas Operator | Sep 2024 |
| 19312 | Moncrief, C. B. | Fort Worth, TX 76102 | Oil & Gas Operator | Aug 2021 |
| 19313 | Monday Creek Resources LTD | Logan, OH 43138 | Oil Operator | Dec 2023 |
| 19314 | Mondiale Energy, Inc. | Brownwood, TX 76801 | Oil & Gas Operator | Nov 2024 |
| 19315 | Mondo Operating Company | Kilgore, TX 75663 | Oil & Gas Operator | Nov 2024 |
| 19316 | Monex | | Oil Operator | Apr 1988 |
| 19317 | Monexco | Edmond, OK 73034-3776 | Oil & Gas Operator | Mar 2008 |
| 19318 | Monexco LLC | Dallas, TX 75204-2634 | Oil & Gas Operator | Aug 2024 |
| 19319 | Monexco Operating Company | Dallas, TX 75204-2634 | Oil & Gas Operator | Aug 2024 |
| 19320 | Monexco, Inc. | | Oil Operator | Dec 2003 |
| 19321 | Monfort, Roy C. | Iola, KS 66749 | Oil & Gas Operator | Sep 1989 |
| 19322 | Monge Oil Corp. | | Oil & Gas Operator | Dec 2021 |
| 19323 | Mongoose Energy, LLC | San Antonio, TX 78249 | Oil & Gas Operator | Nov 2024 |
| 19324 | Mongrue Oil Company, Inc. | | Oil & Gas Operator | Oct 1999 |
| 19325 | Mongrue, Roland, Inc | | Oil & Gas Operator | Mar 1979 |
| 19326 | Monitor O&G, L.L.C. | Frisco, TX 75034 | Oil & Gas Operator | Jan 2016 |
| 19327 | Monona LLC | Ligonier, PA 15658-0612 | Gas Operator | Jun 2024 |
| 19328 | Monroe County Water Authority | Rochester, NY 14612 | Gas Operator | Dec 2023 |
| 19329 | Monroe Gas Associates-1 | | Gas Operator | Mar 2000 |
| 19330 | Monroe Gas Joint Venture | | Gas Operator | Sep 2011 |
| 19331 | Monroe James | | Oil & Gas Operator | Oct 1997 |
| 19332 | Monroe Natural Gas Inc | Norman, OK 73071 | Oil & Gas Operator | Sep 2024 |
| 19333 | Monroe Res LTD | Fairport, NY 14450-3218 | Gas Operator | Dec 2004 |
| 19334 | Monroe Well Ser-Amsterdam | | Oil Operator | Dec 1988 |
| 19335 | Monroe Well Ser-La Petr Assoc | | Oil Operator | Dec 1988 |
| 19336 | Monroe Well Ser-La Petro II | | Oil Operator | Dec 1988 |
| 19337 | Monroe Well Ser-New American85 | | Oil Operator | Dec 1988 |
| 19338 | Monroe Well Ser-Ocean Petr '84 | | Oil & Gas Operator | Dec 1988 |
| 19339 | Monroe Well Ser-Ocean Yacht II | | Oil Operator | May 1989 |
| 19340 | Monroe Well Ser-Oceanyacht1985 | | Oil Operator | Dec 1988 |
| 19341 | Monroe Well Ser-Riverside 1985 | | Oil Operator | Dec 1988 |
| 19342 | Monroe Well Serv-New American | | Oil Operator | Dec 1988 |
| 19343 | Monroe Well Serv-Northern La | | Oil Operator | Dec 1988 |
| 19344 | Monroe Well Serv-Omega 1985 | | Oil Operator | Dec 1988 |
| 19345 | Monroe Well Service | | Oil & Gas Operator | Apr 1998 |
| 19346 | Monroe Well Service-Ajk | | Oil Operator | Dec 1988 |
| 19347 | Monroe Well Service-Apk | | Oil Operator | Dec 1988 |
| 19348 | Monroe Well Service-Beaver1985 | | Oil Operator | Nov 1991 |
| 19349 | Monroe Well Service-Broadway | | Oil Operator | Dec 1988 |
| 19350 | Monroe Well Service-BWK | | Oil Operator | Dec 1988 |
| 19351 | Monroe Well Service-Columbus | | Oil Operator | Dec 1988 |
| 19352 | Monroe Well Service-Das | | Oil Operator | Mar 1989 |
| 19353 | Monroe Well Service-Derrick | | Oil Operator | Dec 1988 |
| 19354 | Monroe Well Service-East End | | Oil Operator | Dec 1988 |
| 19355 | Monroe Well Service-Empire | | Oil Operator | Dec 1988 |
| 19356 | Monroe Well Service-Energy | | Oil Operator | Dec 1988 |
| 19357 | Monroe Well Service-Energy 84 | | Oil Operator | Aug 1989 |
| 19358 | Monroe Well Service-Ged | | Oil Operator | Dec 1988 |
| 19359 | Monroe Well Service-Gotham | | Oil Operator | Apr 1992 |
| 19360 | Monroe Well Service-Gramercy | | Oil Operator | May 1992 |
| 19361 | Monroe Well Service-HGC | | Oil Operator | Dec 1988 |
| 19362 | Monroe Well Service-Lebo | | Oil Operator | Jun 1989 |
| 19363 | Monroe Well Service-Lexington | | Oil Operator | Feb 1989 |
| 19364 | Monroe Well Service-Newtown | | Oil Operator | Aug 1990 |
| 19365 | Monroe Well Service-Ocean | | Oil Operator | Feb 1989 |
| 19366 | Monroe Well Service-Oceanyacht | | Oil Operator | Jan 1989 |
| 19367 | Monroe Well Service-Oil City | | Oil Operator | Aug 1992 |
| 19368 | Monroe Well Service-Omega | | Oil Operator | Aug 1992 |
| 19369 | Monroe Well Service-Par | | Oil Operator | Jan 1990 |
| 19370 | Monroe Well Service-Petrol | | Oil Operator | Sep 1992 |
| 19371 | Monroe Well Service-Petrovest | | Oil Operator | Dec 1988 |
| 19372 | Monroe Well Service-PRG | | Oil Operator | Nov 1990 |
| 19373 | Monroe Well Service-Redstone | | Oil Operator | Jul 1989 |
| 19374 | Monroe Well Service-RVS | | Oil Operator | Dec 1990 |
| 19375 | Monroe Well Service-Shemen | | Oil Operator | Dec 1988 |
| 19376 | Monroe Well Service-Shemen1984 | | Oil Operator | Jan 1989 |
| 19377 | Monroe Well Service-Shemen1985 | | Oil Operator | Nov 1990 |
| 19378 | Monroe Well Service-Sla | | Oil Operator | Mar 1989 |
| 19379 | Monroe Well Service-SPD | | Oil Operator | Dec 1988 |
| 19380 | Monroe Well Service-SPD 1985 | | Oil Operator | Dec 1988 |
| 19381 | Monroe Well Service-TBR | | Oil Operator | Aug 1991 |
| 19382 | Monroe Well Service-TG I | | Oil Operator | Oct 1990 |
| 19383 | Monroe Well Service-TG II | | Oil Operator | Oct 1990 |
| 19384 | Monroe Well Service-TG III | | Oil Operator | Jul 1992 |
| 19385 | Monroe Well Service-TG VI | | Oil Operator | Aug 1989 |
| 19386 | Monroe Well Service-Tpa 1985 | | Oil Operator | Dec 1990 |
| 19387 | Monroe Well Service-Vista | | Oil Operator | Nov 1990 |
| 19388 | Monroe Well Service-West End | | Oil Operator | Dec 1988 |
| 19389 | Monroe Well Service-York | | Oil Operator | Dec 1988 |
| 19390 | Monroe, Cameron | Westfield, NY 14787 | Gas Operator | Dec 2023 |
| 19391 | Monsanto | Englewood, CO 80111 | Oil & Gas Operator | Apr 1986 |
| 19392 | Monsanto Company | Indianapolis, IN 46280 | Oil & Gas Operator | Jan 2005 |
| 19393 | Monsanto Oil Com | | Oil Operator | Nov 1996 |
| 19394 | Monsanto Oil Company | | Oil & Gas Operator | Apr 1986 |
| 19395 | Montalban Oil & Gas Operations, Inc. | Cut Bank, MT 59427 | Oil & Gas Operator | Sep 2024 |
| 19396 | Montana Energy Company, LLC | McAllen, TX 78501 | Oil & Gas Operator | Aug 2024 |
| 19397 | Montana Heartland LLC | Bismarck, ND 58504 | Oil & Gas Operator | Aug 2024 |
| 19398 | Montana Land & Exploration, Inc. | Calgary, AB T2P 3E7 | Oil & Gas Operator | Apr 2019 |
| 19399 | Montana Oil Field Acquisition I, LLC | Rutherford, NJ 07070 | Oil Operator | Jun 2016 |
| 19400 | Montana Power Company | Butte, MT 59701 | Oil & Gas Operator | Apr 2002 |