| 1201 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Feb 2026 |
| 1202 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 1203 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 1204 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2026 |
| 1205 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 1206 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 1207 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 1208 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 1209 | Meng Oper & Expl Co | | Oil & Gas Operator | Dec 1989 |
| 1210 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2024 |
| 1211 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 1212 | Mentren Corporation | | Gas Operator | Mar 2026 |
| 1213 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Aug 2025 |
| 1214 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Jun 2026 |
| 1215 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 1216 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 1217 | Mercer Oil And Gas Co Inc | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 1218 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 1219 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 1220 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Jun 2026 |
| 1221 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 1222 | Mercury Resources LLC | | Oil & Gas Operator | Apr 2026 |
| 1223 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 1224 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 1225 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 1226 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 1227 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 1228 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 1229 | Meridian Energy Inc. | | Oil Operator | Feb 2026 |
| 1230 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 1231 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 1232 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 1233 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 1234 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 1235 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 1236 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 1237 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 1238 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 1239 | Meridian Production Services LLC | | Oil & Gas Operator | Apr 2026 |
| 1240 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 1241 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 1242 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 1243 | Meridian Resources LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 1244 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 1245 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 1246 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Jun 2026 |
| 1247 | Merit Energy Company, LLC | Dallas, TX 75240 | Oil & Gas Operator | Feb 2026 |
| 1248 | Merit Field LLC | | Oil & Gas Operator | Dec 2001 |
| 1249 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 1250 | Merit Productions | | Oil Operator | Sep 1996 |
| 1251 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 1252 | Meritage Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 1253 | Meritage Homes Of California Inc. | | Oil Operator | Dec 2020 |
| 1254 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Jun 2026 |
| 1255 | Merkin LLC | Austin, TX 78737 | Oil Operator | Jun 2026 |
| 1256 | Merl Wiggins Et Al | | Oil & Gas Operator | Sep 1996 |
| 1257 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 1258 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 1259 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 1260 | Merrick Oil & Gas | | Oil & Gas Operator | Jan 2026 |
| 1261 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 1262 | Merrico Resource | | Oil Operator | Dec 1996 |
| 1263 | Merrico Resources | | Oil Operator | Mar 1992 |
| 1264 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |
| 1265 | Merrill Natural Res Inc | Woodsfield, OH 43793 | Oil & Gas Operator | Dec 1985 |
| 1266 | Merrill Operating, LLC | Snyder, TX 79550 | Oil Operator | Apr 2016 |
| 1267 | Merrill, Brian G. | Depew, NY 14043 | Gas Operator | Dec 2024 |
| 1268 | Merrimac Energy Corp. | Dallas, TX 75206 | Oil & Gas Operator | Aug 1999 |
| 1269 | Merrion & Bayless | Farmington, NM 87401 | Oil & Gas Operator | May 1982 |
| 1270 | Merrion Oil & Gas Corp | Farmington, NM 87401 | Oil & Gas Operator | Mar 2026 |
| 1271 | Merritt Oil Comp | | Oil Operator | Jan 1990 |
| 1272 | Merritt Operating, Inc. | Mineola, TX 75773 | Oil & Gas Operator | Jun 2026 |
| 1273 | Merritt, William Kevin | Dallas, TX 75225 | Oil & Gas Operator | Dec 1994 |
| 1274 | Mert Development Inc | | Oil & Gas Operator | Dec 2021 |
| 1275 | Merta, Mike | Alice, TX 78333 | Oil & Gas Operator | Aug 2005 |
| 1276 | Mertz Energy LLC | Houston, TX 77098 | Oil & Gas Operator | Jan 2025 |
| 1277 | Mervin Troyer | Union City, PA 16438-8510 | Gas Operator | Dec 2008 |
| 1278 | Mervine Oil Company Inc | Blackwell, OK 74631-0514 | Oil Operator | Jan 2013 |
| 1279 | Merzbacher, George F. Jr. | Robstown, TX 78380 | Oil & Gas Operator | May 1994 |
| 1280 | Mesa Chica Corp. | San Antonio, TX 78278 | Oil & Gas Operator | May 2018 |
| 1281 | Mesa Energy, Inc. | Austin, TX 78755 | Oil & Gas Operator | Dec 2013 |
| 1282 | Mesa Exploration Company Inc | Shawnee, OK 74801 | Oil & Gas Operator | Mar 2026 |
| 1283 | Mesa Gulf Coast LLC | | Oil & Gas Operator | Dec 2020 |
| 1284 | Mesa Operating Co. | Irving, TX 75039 | Oil & Gas Operator | Aug 1997 |
| 1285 | Mesa Operating L | | Oil & Gas Operator | Dec 1996 |
| 1286 | Mesa Operating LP | Irving, TX 75039-3746 | Oil & Gas Operator | Oct 2010 |
| 1287 | Mesa Operating LTD Partnership | Amarillo, TX 79189 | Oil & Gas Operator | May 1994 |
| 1288 | Mesa Petroleum C | | Oil & Gas Operator | Dec 1986 |
| 1289 | Mesa Petroleum Co. | | Oil & Gas Operator | Aug 1985 |
| 1290 | Mesa Production Company | Amarillo, TX 79189 | Oil & Gas Operator | Dec 1983 |
| 1291 | Mesa Ridge Holdings LLC | Abilene, TX 79603 | Oil Operator | Jun 2026 |
| 1292 | Mesa VIsta Operating, LLC | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2026 |
| 1293 | Mescalero Energy, Inc. | San Antonio, TX 78231 | Oil & Gas Operator | Aug 2003 |
| 1294 | Mescko Operating & Prod | Seville, OH 44273 | Oil & Gas Operator | Feb 2026 |
| 1295 | Mescko Producing & Operating Co. Inc. | Burbank, OH 44214 | Oil & Gas Operator | Dec 2025 |
| 1296 | Mesh LTD | Zanesville, OH 43701 | Oil & Gas Operator | Dec 2025 |
| 1297 | Mesquite Land & Minerals Co. | Albany, TX 76430 | Oil Operator | Jun 2026 |
| 1298 | Mesquite Oil & Gas Production | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2026 |
| 1299 | Mesquite SWD Inc | Carlsbad, NM 88221 | Oil & Gas Operator | Jun 2026 |
| 1300 | Messenger Petroleum, Inc. | Kingman, KS 67068 | Oil & Gas Operator | Feb 2026 |