| 1201 | Mega Petroleum Corporation | Dallas, TX 75202 | Gas Operator | Feb 1998 |
| 1202 | Mega Resources Inc | Dallas, TX 75225-0186 | Oil & Gas Operator | Jan 2001 |
| 1203 | Megadon Enterprises, Inc | Salt Lake City, UT 84121 | Oil Operator | May 2020 |
| 1204 | Megaenergy Operating, Inc. | Edmond, OK 73034 | Oil & Gas Operator | Jul 2015 |
| 1205 | Megan Oil & Gas Co., Inc. | Spencer, WV 25276-0000 | Oil & Gas Operator | Dec 2021 |
| 1206 | Megargel Drilling Company | Megargel, TX 76370 | Oil Operator | Nov 1998 |
| 1207 | Megas Corp | North Ridgevill, OH 44039 | Oil & Gas Operator | Dec 1984 |
| 1208 | Megg, L.P. | Borger, TX 79008 | Oil & Gas Operator | Oct 2025 |
| 1209 | Mego Resources, LLC | Taft, TX 78390 | Oil & Gas Operator | Oct 2025 |
| 1210 | Mehaffey Investments, Inc. | Eastland, TX 76448 | Oil & Gas Operator | Oct 2025 |
| 1211 | Mei Operating Company | Lafayette, LA 70598 | Oil & Gas Operator | Aug 1997 |
| 1212 | Meier Joe Oil Op | | Oil Operator | Jul 1983 |
| 1213 | Mel Cox Transports Inc | Comanche, OK 73529-7640 | Oil & Gas Operator | Jul 2022 |
| 1214 | Mel-Ray Oil Company | Nowata, OK 74048-0149 | Oil & Gas Operator | Mar 2004 |
| 1215 | Melanie Oil Dril USA Inc | Millersburg, OH 44654 | Oil & Gas Operator | Dec 1989 |
| 1216 | Melcar Production | Tuscola, TX 79562 | Oil & Gas Operator | Oct 2025 |
| 1217 | Meleen, Catherine M. & Ruch, Jerry E. | Westfield, NY 14787 | Gas Operator | Dec 2024 |
| 1218 | Melland Drilling | | Oil Operator | Nov 1992 |
| 1219 | Mellenco Inc | Scottsdale, AZ 85253 | Oil & Gas Operator | Dec 1990 |
| 1220 | Mello-Dy Resources, LLC | Devine, TX 78016 | Oil Operator | Oct 2025 |
| 1221 | Mellon Creek Operating Co. | Victoria, TX 77901 | Oil & Gas Operator | Jun 1993 |
| 1222 | Mellon Oil Unit | Refugio, TX 78377 | Oil & Gas Operator | Jun 2004 |
| 1223 | Melren Oil & Gas Expl., Inc. | | Gas Operator | Nov 1989 |
| 1224 | Melrose Group In | | Oil Operator | Feb 1994 |
| 1225 | Melrose Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Sep 2011 |
| 1226 | Mels Water Service Inc | Lysite, WY 82642 | Oil Operator | Mar 2013 |
| 1227 | Melson Oil & Gas Inc | Broken Arrow, OK 74014 | Oil & Gas Operator | Jun 2025 |
| 1228 | Melton Operating Co. | Friendswood, TX 77546 | Oil & Gas Operator | Jul 2005 |
| 1229 | Melton, Joe, DRLG. Co., Inc. | Midland, TX 79704 | Oil & Gas Operator | Dec 2004 |
| 1230 | Melton, Kenneth | Wann, OK 74083 | Oil Operator | Jun 2025 |
| 1231 | Meltzer Oil Comp | | Oil Operator | Dec 1983 |
| 1232 | Melvin Or Kathleen Turnbow | Portales, NM 88130 | Oil & Gas Operator | Mar 2006 |
| 1233 | Melzer Exploration Company | Midland, TX 79702-2083 | Oil & Gas Operator | May 2013 |
| 1234 | Mem Partnership LP, A General Partnership | Spring, TX 77393 | Oil Operator | Jun 2025 |
| 1235 | Memaca Petroleum Corporation | | Oil & Gas Operator | Jan 1990 |
| 1236 | Memorial Exploration Company | Saint Louis, MO 63105 | Oil & Gas Operator | Aug 1996 |
| 1237 | Memorial Production Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 1238 | Menasco, J. | Wichita Falls, TX 76310 | Oil & Gas Operator | Dec 2019 |
| 1239 | Mendell Davis Gas Partners LLC | | Oil & Gas Operator | Dec 2013 |
| 1240 | Mendell Finisterre II LLC | | Oil & Gas Operator | Jun 2017 |
| 1241 | Mendell Niobrara LLC | | Oil & Gas Operator | Apr 2017 |
| 1242 | Mendell Petroleum Corporation | Castle Rock, CO 80104-9045 | Oil & Gas Operator | Sep 2004 |
| 1243 | Meng Oper. & Expl. Co. | | Oil & Gas Operator | Dec 1989 |
| 1244 | Meng, Charles H | Lexington, KY 40502 | Gas Operator | Dec 2023 |
| 1245 | Menoah Petroleum Inc | | Oil & Gas Operator | Dec 2024 |
| 1246 | Mentren Corporation | | Gas Operator | Aug 2025 |
| 1247 | Mep Operating LLC | Houston, TX 77056-2733 | Oil & Gas Operator | Jul 2025 |
| 1248 | Mer Resources | Edmond, OK 73013 | Oil & Gas Operator | Oct 2025 |
| 1249 | Mer Resources Inc | Edmond, OK 73013-7662 | Oil & Gas Operator | Mar 2015 |
| 1250 | Mer-Bar Exploration Co Inc | Oklahoma City, OK 73118 | Oil & Gas Operator | Oct 1992 |
| 1251 | Mercantile Oil & Gas Prod. Corp. | Galena Park, TX 77547 | Oil & Gas Operator | Jun 2016 |
| 1252 | Mercer Oil & Gas Co. | Norman, OK 73070 | Oil & Gas Operator | Apr 2015 |
| 1253 | Mercer Pet Management Inc | Edmond, OK 73013-6677 | Oil & Gas Operator | Jan 2011 |
| 1254 | Mercury Exploration Co | Fort Worth, TX 76104 | Oil & Gas Operator | Dec 2006 |
| 1255 | Mercury Operating, LLC | Dallas, TX 75208 | Oil & Gas Operator | Oct 2025 |
| 1256 | Mercury Petroleum Company, Inc | | Oil Operator | Dec 2018 |
| 1257 | Mercury Resources LLC | | Oil & Gas Operator | Aug 2025 |
| 1258 | Meredith Enterprises | | Oil Operator | Jun 1988 |
| 1259 | Mereken Energy Corp. | Fort Worth, TX 76102 | Gas Operator | Feb 2006 |
| 1260 | Merelco Inc | Seminole, OK 74868 | Oil Operator | Jun 2014 |
| 1261 | Merenco | Midland, TX 79702 | Oil & Gas Operator | Dec 1996 |
| 1262 | Merex Resources, Inc. | Amarillo, TX 79159 | Oil & Gas Operator | Sep 2019 |
| 1263 | Meridian Energy Company | Cambridge, OH 43725 | Oil & Gas Operator | Dec 2010 |
| 1264 | Meridian Energy Inc. | | Oil Operator | Jun 2025 |
| 1265 | Meridian Exploration Inc | Oklahoma City, OK 73128 | Oil & Gas Operator | Aug 2013 |
| 1266 | Meridian Exploration Corp. | Pittsburgh, PA 15222 | Oil & Gas Operator | Dec 2021 |
| 1267 | Meridian Interests, Inc. | San Antonio, TX 78239 | Oil & Gas Operator | Aug 2003 |
| 1268 | Meridian Oil & Gas Enter | Blairsville, PA 15717 | Oil & Gas Operator | Dec 2004 |
| 1269 | Meridian Oil & Gas Enterprises Inc | Blairsville, PA 15717-0337 | Oil & Gas Operator | Dec 2003 |
| 1270 | Meridian Oil Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 1996 |
| 1271 | Meridian Oil Inc.-Midland | Midland, TX 79702 | Oil & Gas Operator | Jul 1996 |
| 1272 | Meridian Oil Offshore Inc. | | Oil & Gas Operator | Aug 1996 |
| 1273 | Meridian Oil Production Inc. | Houston, TX 77210 | Oil & Gas Operator | Aug 2024 |
| 1274 | Meridian Production Services LLC | | Oil & Gas Operator | Jun 2025 |
| 1275 | Meridian Resource & Expl Co, The | Houston, TX 77077 | Oil & Gas Operator | Dec 2000 |
| 1276 | Meridian Resource & Expl LLC,The | Houston, TX 77094 | Oil & Gas Operator | Nov 2012 |
| 1277 | Meridian Resources (USA) Inc. | | Oil & Gas Operator | Aug 2024 |
| 1278 | Meridian Resources, LLC | Evansville, IN 47715 | Oil Operator | Jul 2024 |
| 1279 | Merimac Investments, Inc. | Fort Worth, TX 76109 | Oil & Gas Operator | Jan 1997 |
| 1280 | Merit Energy Co. Dba Alabama Merit Energy Co., Inc. | | Oil & Gas Operator | Aug 2005 |
| 1281 | Merit Energy Company | Dallas, TX 75240 | Oil & Gas Operator | Oct 2025 |
| 1282 | Merit Energy Company, LLC | Dallas, TX 75009 | Oil & Gas Operator | Jun 2025 |
| 1283 | Merit Field LLC | | Oil & Gas Operator | Dec 2001 |
| 1284 | Merit Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | May 1994 |
| 1285 | Merit Productions | | Oil Operator | Sep 1996 |
| 1286 | Meritage Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | May 2013 |
| 1287 | Meritage Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 1288 | Meritage Homes Of California Inc. | | Oil Operator | Dec 2020 |
| 1289 | Merkaz Drilling, LLC | Dallas, TX 75229 | Oil Operator | Oct 2025 |
| 1290 | Merkin LLC | Austin, TX 78737 | Oil Operator | Oct 2025 |
| 1291 | Merl Wiggins Et Al | | Oil & Gas Operator | Sep 1996 |
| 1292 | Merlin J Verret | | Gas Operator | Jun 1986 |
| 1293 | Merlon Texas, Inc. | Houston, TX 77056 | Oil Operator | Jun 2013 |
| 1294 | Mermac Operating Company Inc | Norman, OK 73072 | Oil & Gas Operator | Mar 2015 |
| 1295 | Meroda Resources LLC | Mustang, OK 73064-9408 | Oil & Gas Operator | Apr 2000 |
| 1296 | Merrick Oil & Gas | | Oil & Gas Operator | Mar 2025 |
| 1297 | Merrick Ward S Inc | Ardmore, OK 73402 | Oil & Gas Operator | Feb 2001 |
| 1298 | Merrico Resource | | Oil Operator | Dec 1996 |
| 1299 | Merrico Resources | | Oil Operator | Mar 1992 |
| 1300 | Merrico Resources, Inc. | Ardmore, OK 73402 | Oil & Gas Operator | Mar 2008 |