| 1301 | Mentren Corporation | | Gas Operator | Dec 2025 |
| 1302 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Aug 2025 |
| 1303 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Feb 2026 |
| 1304 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 1305 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 1306 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 1307 | Mercer Oil And Gas Co Inc | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 1308 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 1309 | Mercury Exploration Co. | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 1310 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Feb 2026 |
| 1311 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 1312 | Mercury Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 1313 | Mercy Oil And Gas, LP | Aransas Pass, TX 78335 | Oil & Gas Operator | Feb 2026 |
| 1314 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 1315 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 1316 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 1317 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 1318 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 1319 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 1320 | Meridian Energy Inc. | | Oil Operator | Sep 2025 |
| 1321 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 1322 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 1323 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 1324 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 1325 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 1326 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 1327 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 1328 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 1329 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 1330 | Meridian Production Services LLC | | Oil & Gas Operator | Dec 2025 |
| 1331 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 1332 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 1333 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 1334 | Meridian Resources LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 1335 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 1336 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 1337 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 1338 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Sep 2025 |
| 1339 | Merit Field LLC | | Oil & Gas Operator | Dec 2001 |
| 1340 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 1341 | Merit Productions | | Oil Operator | Sep 1996 |
| 1342 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 1343 | Meritage Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 1344 | Meritage Homes Of California Inc. | | Oil Operator | Dec 2020 |
| 1345 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Feb 2026 |
| 1346 | Merkin LLC | Austin, TX 78737 | Oil Operator | Feb 2026 |
| 1347 | Merl Wiggins Et Al | | Oil & Gas Operator | Sep 1996 |
| 1348 | Merlin J Verret | | Gas Operator | Jun 1986 |
| 1349 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 1350 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 1351 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 1352 | Merrick Oil & Gas | | Oil & Gas Operator | Sep 2025 |
| 1353 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 1354 | Merrico Resource | | Oil Operator | Dec 1996 |
| 1355 | Merrico Resources | | Oil Operator | Mar 1992 |
| 1356 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 1357 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 1358 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 1359 | Merrill, Brian G. | Depew, NY 14043 | Gas Operator | Dec 2024 |
| 1360 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 1361 | Merrimac Oil & Gas LLC | Houston, TX 77054 | Gas Operator | Dec 2008 |
| 1362 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 1363 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Dec 2025 |
| 1364 | Merritt Oil Comp | | Oil Operator | Jan 1990 |
| 1365 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Feb 2026 |
| 1366 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 1367 | Mert Development Inc | | Oil & Gas Operator | Dec 2021 |
| 1368 | Merta, Mike | Alice, TX 78333 | Oil & Gas Operator | Aug 2005 |
| 1369 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 1370 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 1371 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 1372 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 1373 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 1374 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 1375 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Nov 2025 |
| 1376 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 1377 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 1378 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 1379 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 1380 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 1381 | Mesa Operating, LLC | Plano, TX 75093 | Oil & Gas Operator | Feb 2026 |
| 1382 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 1383 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 1384 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 1385 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Feb 2026 |
| 1386 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 1387 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 1388 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Dec 2025 |
| 1389 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2024 |
| 1390 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2024 |
| 1391 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Feb 2026 |
| 1392 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Feb 2026 |
| 1393 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Feb 2026 |
| 1394 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Sep 2025 |
| 1395 | Messer Helium Cliffside LLC | Bridgewater, NJ 08807 | Gas Operator | Feb 2026 |
| 1396 | Messer LLC | | Gas Operator | Dec 2025 |
| 1397 | Messman Corporation | Wichita, KS 67208 | Oil & Gas Operator | Sep 2025 |
| 1398 | Messman-Rinehart | | Oil & Gas Operator | Mar 1991 |
| 1399 | Messy Oil And Gas, LLC | Garwood, TX 77442 | Oil & Gas Operator | Feb 2026 |
| 1400 | Mestena Operating, L.L.C. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Aug 2015 |