| 2301 | MSR Exploration, Inc. | Winters, TX 79567 | Oil & Gas Operator | Mar 2000 |
| 2302 | MSSK Consulting LLC | San Antonio, TX 78253 | Oil Operator | Apr 2025 |
| 2303 | MT Dora Energy Corporation | Duncan, OK 73533-1829 | Oil & Gas Operator | Apr 2014 |
| 2304 | MT Dora Energy LLC | Houston, OK 77056-1940 | Oil & Gas Operator | Jun 2019 |
| 2305 | MT Energy LLC | Waskom, TX 75692 | Oil & Gas Operator | Apr 2025 |
| 2306 | MT Savage Refractories | Pittsburgh, PA 15206-0171 | Gas Operator | Dec 2021 |
| 2307 | MT. Crescent Operating Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 2308 | MTBB Acquisition Company, LLC | Houston, TX 77002 | Oil & Gas Operator | Aug 2022 |
| 2309 | MTG Operating Inc | Ridgeland, MS 39158 | Gas Operator | Apr 2011 |
| 2310 | MTM Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Dec 2024 |
| 2311 | MTN Energy | Aleppo, PA 15310 | Oil & Gas Operator | Feb 2025 |
| 2312 | MTN V Oil & Gas Inc | Indiana, PA 15701-8914 | Oil & Gas Operator | Dec 2024 |
| 2313 | Mto Oil Company | Okay, OK 74446-0354 | Oil Operator | Jul 2019 |
| 2314 | Muckleroy Gas | San Antonio, TX 78247 | Gas Operator | Apr 2025 |
| 2315 | Mud Creek Operating, LLC | Tyler, TX 75702 | Oil & Gas Operator | Apr 2025 |
| 2316 | Mud Operations Inc | Ames, OK 73718-9501 | Oil & Gas Operator | Feb 2025 |
| 2317 | Mud River Gas Co | | Gas Operator | Dec 2021 |
| 2318 | Mud River Oil & Gas, LLC | Rochester, KY 42273 | Oil Operator | Dec 2023 |
| 2319 | Mudslinger Oil, L.L.C. | Abilene, TX 79601 | Oil Operator | Apr 2025 |
| 2320 | Muegge Don E | Lamont, OK 74643-5010 | Oil & Gas Operator | Dec 1996 |
| 2321 | Muegge, Clay A. | Lamont, OK 74643 | Oil & Gas Operator | Feb 2025 |
| 2322 | Mueggenborg Derrick R Dba DRM Oil & Gas | Yale, OK 74085 | Oil Operator | Jan 2025 |
| 2323 | Mueller Engineering Corp. | Corpus Chrsti, TX 78476 | Oil & Gas Operator | Feb 2002 |
| 2324 | Mueller Exploration, Inc. | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 2325 | Mueller Fred W | | Oil & Gas Operator | Dec 1995 |
| 2326 | Mueller Oil | | Oil Operator | Dec 2024 |
| 2327 | Mueller Thomas C | Fort Smith, AR 72913 | Gas Operator | Aug 2008 |
| 2328 | Mueller Thomas C LTD | Oklahoma City, OK 73102-5683 | Gas Operator | Aug 2008 |
| 2329 | Muenster Drilling Co. Inc. | Muenster, TX 76252 | Oil & Gas Operator | Apr 2025 |
| 2330 | Muffoletto, Michael R. | Brant, NY 14027 | Gas Operator | Dec 2023 |
| 2331 | Mugg, John D. Jr. | San Antonio, TX 78216 | Oil & Gas Operator | Nov 1997 |
| 2332 | Muirfield Exploration, LTD. | Wichita Falls, TX 76301 | Oil & Gas Operator | Apr 2025 |
| 2333 | Muirfield Resources Company | Tulsa, OK 74101-3166 | Oil & Gas Operator | Jun 2024 |
| 2334 | Muldowney Development, Inc. | Dunkirk, NY 14048 | Gas Operator | Dec 2023 |
| 2335 | Muleshoe Crude, LP | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 2336 | Mull Drilling Company | Wichita, KS 67206 | Oil & Gas Operator | Feb 2025 |
| 2337 | Mullen Exploration Inc | | Oil & Gas Operator | Dec 2002 |
| 2338 | Mullen Jr J S | | Oil & Gas Operator | Feb 1992 |
| 2339 | Mullen Resources LLC | Reedy, WV 25270 | Oil & Gas Operator | Dec 2021 |
| 2340 | Mullen William Company | Edmond, OK 73083-1372 | Oil & Gas Operator | May 1999 |
| 2341 | Mullen-Hathorn-Bass | | Oil & Gas Operator | Mar 1985 |
| 2342 | Muller Oil & Gas | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2025 |
| 2343 | Mullin, W. B. | Graham, TX 76450 | Oil & Gas Operator | Sep 1998 |
| 2344 | Mullins & Prichard | | Oil & Gas Operator | May 1992 |
| 2345 | Mullins Jimmy R Dba Southcreek Petroleum Co | Dibble, OK 73031 | Oil & Gas Operator | Jan 2021 |
| 2346 | Mullins John S | Hominy, OK 74035 | Oil Operator | Nov 2014 |
| 2347 | Mullins Well Service | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 2018 |
| 2348 | Mullins, Manuel | Olney, TX 76374 | Oil & Gas Operator | Apr 2025 |
| 2349 | Mulloy Operating, Inc. | Midland, TX 79701 | Oil & Gas Operator | Apr 2025 |
| 2350 | Mulloy, J. W. Associates, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2003 |
| 2351 | Multipay Energy, Inc. | Austin, TX 78749 | Oil Operator | Apr 2025 |
| 2352 | Multiplex Resources, Inc. | Baytown, TX 77521 | Oil Operator | Dec 2009 |
| 2353 | Multistates Oil Properties, NV | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 1998 |
| 2354 | Mumford, Catherine | Waterloo, NY 13165 | Gas Operator | Dec 2023 |
| 2355 | Mumford-Gabel, Jennifer And Kyle Gabel | Lawtons, NY 14091 | Gas Operator | Dec 2023 |
| 2356 | Mumma Oil Production Co., Inc. | Allentown, PA 18109-0000 | Oil & Gas Operator | Dec 2019 |
| 2357 | Munday Operating Co., L.L.C. | | Oil & Gas Operator | May 2007 |
| 2358 | Mundell F E | Watertown, SD 57201 | Oil & Gas Operator | Aug 1994 |
| 2359 | Munn, W. H. Operating Company | Midland, TX 79702 | Oil & Gas Operator | Sep 2002 |
| 2360 | Munoco Co. | El Dorado, AR 71730 | Oil & Gas Operator | Jul 2021 |
| 2361 | Munoco Co. L.C. | | Oil & Gas Operator | Jun 2003 |
| 2362 | Munoz Farms Operating Co., LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Apr 2025 |
| 2363 | Munson Dave Company | Dallas, TX 75201-3591 | Oil Operator | Aug 1996 |
| 2364 | Munson Operating, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 2365 | Munson, Charles C. | Dallas, TX 75201 | Oil & Gas Operator | Apr 2002 |
| 2366 | Munson, David M. | Dallas, TX 75201 | Oil & Gas Operator | Mar 2015 |
| 2367 | Munson, David M. Inc. | Dallas, TX 75251 | Oil & Gas Operator | Apr 2025 |
| 2368 | Munson, E. P., Jr. | Fort Worth, TX 76121 | Oil & Gas Operator | Oct 1995 |
| 2369 | Muras Energy Inc | Edmond, OK 73013 | Oil & Gas Operator | Jan 2025 |
| 2370 | Murchison Oil & | | Oil Operator | Mar 1988 |
| 2371 | Murchison Oil & Gas Inc | Plano, TX 75024 | Oil & Gas Operator | Mar 2024 |
| 2372 | Murchison Oil And Gas, LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 2373 | Murchison Trusts | | Gas Operator | Sep 2003 |
| 2374 | Murchison, G. B. Trust | Dallas, TX 75283 | Oil & Gas Operator | Sep 1994 |
| 2375 | Murdoch Oil Co Inc | Bluff, UT 84512 | Oil & Gas Operator | Jun 2010 |
| 2376 | Murex Petroleum Corporation | Humble, TX 77347 | Oil & Gas Operator | Feb 2025 |
| 2377 | Murexco Petroleum, Inc. | Dallas, TX 75251 | Oil & Gas Operator | Oct 1996 |
| 2378 | Murfin Drilling | | Oil & Gas Operator | Jul 1997 |
| 2379 | Murfin Drilling Company Inc | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 2380 | Murjo Oil & Royalty Company | Fort Worth, TX 76121 | Oil & Gas Operator | Dec 2024 |
| 2381 | Murk, James M. | Wheaton, IL 60189 | Gas Operator | Jan 1999 |
| 2382 | Muroz International Group Inc | Houston, TX 77056 | Oil Operator | Apr 2025 |
| 2383 | Murphree Brothers Production | Monahans, TX 79756 | Oil & Gas Operator | Apr 2025 |
| 2384 | Murphree Production | Monahans, TX 79756 | Oil & Gas Operator | Jul 2014 |
| 2385 | Murphrey Oil Co | | Oil Operator | Jan 2025 |
| 2386 | Murphy & Associates, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Oct 1996 |
| 2387 | Murphy - Sun | | Oil & Gas Operator | May 1989 |
| 2388 | Murphy D V | | Oil Operator | Dec 1989 |
| 2389 | Murphy Energy Services, LP | Saratoga, TX 77585 | Oil Operator | Dec 2018 |
| 2390 | Murphy Exp & Prod Co.-USA | | Oil & Gas Operator | May 2014 |
| 2391 | Murphy Expl. & Prod. Co. - USA | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 2392 | Murphy Exploration & Prod. Co. | Houston, TX 77094 | Oil & Gas Operator | Jun 2011 |
| 2393 | Murphy Exploration & Production | Houston, TX 77024 | Oil Operator | Dec 2024 |
| 2394 | Murphy Helen Colpitt Trust | Collinsville, OK 74021-0128 | Oil & Gas Operator | May 2002 |
| 2395 | Murphy Jack L | Tulsa, OK 74104-4915 | Oil Operator | Mar 2015 |
| 2396 | Murphy Oil Company Inc | Lancaster, OH 43130 | Oil & Gas Operator | Dec 2023 |
| 2397 | Murphy Oil USA Inc | New Orleans, LA 70161 | Oil & Gas Operator | Jan 1993 |
| 2398 | Murphy Operating Corp | Roswell, NM 88202 | Oil & Gas Operator | Apr 1998 |
| 2399 | Murphy Prod Inc | Vanderbilt, PA 15486-1001 | Oil & Gas Operator | Dec 2024 |
| 2400 | Murphy Production Co. (Inc.) | | Oil & Gas Operator | Apr 1991 |