| 1301 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 1302 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 1303 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 1304 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 1305 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 1306 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 1307 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Apr 2026 |
| 1308 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 1309 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 1310 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 1311 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 1312 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 1313 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 1314 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 1315 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 1316 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Jul 2026 |
| 1317 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2026 |
| 1318 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 1319 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Feb 2026 |
| 1320 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2025 |
| 1321 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2025 |
| 1322 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Jul 2026 |
| 1323 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2026 |
| 1324 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jul 2026 |
| 1325 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Mar 2026 |
| 1326 | Messer Helium Cliffside LLC | Bridgewater, NJ 08807 | Gas Operator | Jul 2026 |
| 1327 | Messer LLC | | Gas Operator | May 2026 |
| 1328 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Mar 2026 |
| 1329 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 1330 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Jul 2026 |
| 1331 | Mestena Operating, L.L.C. | Corpus Christ, TX 78401 | Oil & Gas Operator | Aug 2015 |
| 1332 | Mestena Operating, LTD. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Jun 2009 |
| 1333 | Mestena, Inc. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Nov 2001 |
| 1334 | Metairie Energy Company, Inc. | | Oil & Gas Operator | Nov 2019 |
| 1335 | Metano Energy III, LP | Tulsa, OK 74121 | Oil & Gas Operator | Jul 2026 |
| 1336 | Metano Energy, LP | San Antonio, TX 78216 | Oil & Gas Operator | Aug 2008 |
| 1337 | Metco Oil Corporation | Seguin, TX 78155 | Oil Operator | Apr 2016 |
| 1338 | Meteor Developments Inc | Denver, CO BAD ADDR | Oil & Gas Operator | Dec 1995 |
| 1339 | Meter, Erin L. & William J. | Dansville, NY 14437 | Gas Operator | Dec 2025 |
| 1340 | Metgas Co, A Partnership | | Oil & Gas Operator | Dec 2016 |
| 1341 | Methane Productions Inc | Recluse, WY 82725 | Oil & Gas Operator | Apr 2007 |
| 1342 | Metro Energy Group, Inc. | Bossier City, LA 71112 | Oil & Gas Operator | May 2013 |
| 1343 | Metro Energy LTD | Scottsdale, AZ 85254 | Oil Operator | Aug 2000 |
| 1344 | Metro Energy, Inc. | Gladstone, MO 64118 | Oil Operator | May 1997 |
| 1345 | Metro Oil Compan | | Oil Operator | Jan 1991 |
| 1346 | Metroplex Barnett Shale LLC | Houston, TX 77001 | Gas Operator | Sep 2008 |
| 1347 | Metropolitan Resources Corp | Tulsa, OK 74169-1734 | Oil & Gas Operator | Mar 2015 |
| 1348 | Mettz,Carmody & Foster Oil Co | | Oil Operator | May 1990 |
| 1349 | Metzger Ed W & Sue | Junction City, OH 43748 | Oil Operator | Dec 2025 |
| 1350 | Metzger Francis A | Junction City, OH 43748 | Oil & Gas Operator | Dec 1999 |
| 1351 | Metzgers Bob | Junction City, OH 43748 | Oil & Gas Operator | Dec 2025 |
| 1352 | Metzner, Norma J. Estate | Wichita Falls, TX 76307 | Oil & Gas Operator | Oct 1998 |
| 1353 | Mewbourne Marketing, Inc. | | Oil & Gas Operator | Mar 2013 |
| 1354 | Mewbourne Oil Company | Tyler, TX 75711 | Oil & Gas Operator | Jul 2026 |
| 1355 | Mexco Energy Corporation | Midland, TX 79702 | Oil & Gas Operator | Feb 2020 |
| 1356 | Mextex Operating Company | Austin, TX 78734 | Oil & Gas Operator | Jul 2026 |
| 1357 | Meyer Douglas P | Longmont, CO 80501 | Oil & Gas Operator | Aug 2006 |
| 1358 | Meyer Oil Co., Inc. | Skellytown, TX 79080 | Oil & Gas Operator | Apr 2026 |
| 1359 | Meyer Richard C Inc | MT Gilead, OH 43338 | Oil & Gas Operator | Dec 1999 |
| 1360 | Meyer, David M. | South Wales, NY 14139 | Gas Operator | Dec 2025 |
| 1361 | Meyer, Norbert | Conway Springs, KS 67031 | Oil Operator | Aug 1994 |
| 1362 | Meyer, Ruskin H. Et Al | | Oil Operator | Oct 1980 |
| 1363 | Meyer, Theodore J. | Conway Springs, KS 67031 | Oil Operator | Mar 2026 |
| 1364 | Meyerhoff & Cox Inc | Tulsa, OK 74135-7830 | Oil Operator | Aug 1993 |
| 1365 | Meyers Marsha L | Danville, OH 43014 | Oil & Gas Operator | Dec 2007 |
| 1366 | Meyers-Lasher, Inc. | | Oil & Gas Operator | Mar 1999 |
| 1367 | MFC Drilling Inc | Coshocton, OH 43812 | Oil & Gas Operator | Dec 2025 |
| 1368 | MFP Petroleum LP | Oklahoma City, OK 73142-3017 | Gas Operator | Apr 2026 |
| 1369 | MFP Petroleum LTD. Partnership | Oklahoma City, OK 73142 | Oil & Gas Operator | Nov 2017 |
| 1370 | Mga Energy Inc | Corning, OH 43730 | Oil & Gas Operator | Dec 2025 |
| 1371 | Mge Resources, Inc. | Perryton, TX 79070 | Oil & Gas Operator | Mar 2026 |
| 1372 | MGF Oil Corporation | Tulsa, OK 74121 | Oil & Gas Operator | Jun 1998 |
| 1373 | MGM Oil & Gas Company | Midland, TX 79702 | Oil & Gas Operator | Jul 2026 |
| 1374 | MGM Oil & Gas Inc. | Ballinger, TX 76821 | Oil & Gas Operator | Jul 2026 |
| 1375 | MGM Well Service, Inc. | Corpus Chrsti, TX 78427 | Oil & Gas Operator | Oct 2004 |
| 1376 | MH Oilfield Service LLC | Amesville, OH 45711 | Oil & Gas Operator | Dec 2023 |
| 1377 | MHM Oil Co. | Dallas, TX 75240 | Oil & Gas Operator | Oct 2002 |
| 1378 | MHM Pipeline Co., Inc. | Dallas, TX 75252 | Oil & Gas Operator | Jul 2026 |
| 1379 | Mi-Co Oil & Gas LLC | Caddo, TX 76429 | Oil Operator | Jul 2026 |
| 1380 | Mi3 Energy LLC | | Oil & Gas Operator | May 2026 |
| 1381 | Miami Oil Producers Inc | Reno, NV 89501 | Oil & Gas Operator | Dec 2012 |
| 1382 | Mica Energy Corp | Lincoln, NE 68516 | Oil & Gas Operator | Dec 2010 |
| 1383 | Mich Geosearch/Eagle O&G | Wichita Falls, TX 76308-1061 | Oil & Gas Operator | Dec 2001 |
| 1384 | Mich-La Oil & Gas Exploration | | Oil & Gas Operator | Jan 1992 |
| 1385 | Michael D Brown | | Oil Operator | Jul 1993 |
| 1386 | Michael D. Traylor LLC | El Dorado, KS 67042 | Oil Operator | Mar 2026 |
| 1387 | Michael D. Weilert Oil Company | | Oil Operator | Mar 2026 |
| 1388 | Michael Goodnight Operating LLC | St Louis, OK 74866 | Oil & Gas Operator | Apr 2026 |
| 1389 | Michael Petr. & Hurd Ent., LTD. | Houston, TX 77056 | Oil & Gas Operator | Oct 1993 |
| 1390 | Michael Petroleum Corporation | Houston, TX 77040 | Oil & Gas Operator | Dec 2001 |
| 1391 | Michael W Mills | | Oil Operator | Jul 2007 |
| 1392 | Michaelis Leo Oi | | Oil Operator | Aug 1991 |
| 1393 | Michaelson Producing Company | MC Camey, TX 79752 | Oil & Gas Operator | Jul 2026 |
| 1394 | Michel T. Halbouty | | Oil & Gas Operator | Dec 1996 |
| 1395 | Michel T. Halbouty Energy Co. | | Oil & Gas Operator | Nov 1986 |
| 1396 | Michigan Gas Utilities Co | | Oil & Gas Operator | Mar 2011 |
| 1397 | Michigan Geosearch Inc | Lansing, MI 48917 | Oil & Gas Operator | Apr 2026 |
| 1398 | Michigan Oil Company | FT Worth, TX 76117 | Oil & Gas Operator | Feb 1998 |
| 1399 | Michigan Petroleum Exploration Inc | | Oil & Gas Operator | Oct 2005 |
| 1400 | Michigan Production Co LLC | | Oil & Gas Operator | Oct 2002 |