| 1201 | Anthony Oil & Gas Co. | Shreveport, LA 71135 | Oil Operator | May 1993 |
| 1202 | Anthony Oil Company | | Oil & Gas Operator | Oct 1987 |
| 1203 | Anthony, Bob G. Inc. | Brookhaven, MS 39601 | Oil & Gas Operator | Feb 2026 |
| 1204 | Anticline Energy, LLC | Three Rivers, MI 49093 | Oil & Gas Operator | Jul 2023 |
| 1205 | Antilley, Joe | Abilene, TX 79602 | Oil & Gas Operator | Jan 2024 |
| 1206 | Antioch Disposal Well Inc | Duncan, OK 73533 | Oil Operator | Jan 1994 |
| 1207 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Dec 2025 |
| 1208 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | Feb 2026 |
| 1209 | Antle, E. | Graham, TX 76450 | Oil & Gas Operator | Oct 1994 |
| 1210 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Aug 2025 |
| 1211 | Antlers Energy LLC | Tulsa, OK 74136 | Oil & Gas Operator | Dec 2025 |
| 1212 | Antrim Development Corp | | Oil & Gas Operator | Oct 2018 |
| 1213 | Anvil Oil Co., Inc. | Bartlesville, OK 74003-5030 | Oil & Gas Operator | Dec 2008 |
| 1214 | Anzalone, James A. | Leesburg, FL 34748 | Gas Operator | Dec 2024 |
| 1215 | Aoco Operating Company, L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Feb 2005 |
| 1216 | Aoco Operating, L.P. | Houston, TX 77008 | Oil & Gas Operator | Mar 2008 |
| 1217 | Aocswd LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 1218 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2025 |
| 1219 | Aog, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2014 |
| 1220 | Aogp, LLC | Turtle Lake, WI 54889 | Oil & Gas Operator | Sep 2019 |
| 1221 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 1222 | Ap Operating LLC | Claflin, KS 67525 | Oil Operator | Jul 2025 |
| 1223 | Ap Operating, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Feb 2026 |
| 1224 | Ap Production LLC | Utica, OH 43080 | Oil & Gas Operator | Dec 2023 |
| 1225 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 1226 | Apache Drilling | | Oil Operator | Sep 1994 |
| 1227 | Apache Drilling Co | Kingman, KS 67068 | Oil Operator | Feb 2006 |
| 1228 | Apache Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 1229 | Apache Natural Gas Co., Inc. | | Oil Operator | Nov 1992 |
| 1230 | Apache Oil Company | San Antonio, TX 78227 | Oil & Gas Operator | Jun 2023 |
| 1231 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 1232 | Apache Production Company | Holliday, TX 76366 | Oil & Gas Operator | Feb 2026 |
| 1233 | Apache Shelf, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2014 |
| 1234 | Apb Oil Corporation | Houston, TX 77052 | Oil & Gas Operator | Apr 1996 |
| 1235 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 1236 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 1237 | Apco Oil Corp | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 1993 |
| 1238 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 1239 | Apex Crude Oil Co | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 1240 | Apex DRLG | Bermuda Dunes, CA 92203 | Oil & Gas Operator | Dec 2019 |
| 1241 | Apex Energy (Pa) LLC | Canonsburg, PA 15317-6523 | Gas Operator | May 2025 |
| 1242 | Apex Energy, Inc. | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Feb 2026 |
| 1243 | Apex Energy, L.L.C. | Tulsa, OK 74114 | Oil & Gas Operator | Oct 2025 |
| 1244 | Apex Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 1994 |
| 1245 | Apex Natural Gas Co Inc | Canton, OH 44718 | Oil & Gas Operator | Dec 1991 |
| 1246 | Apex Natural Gas, LLC | Houston, TX 77002 | Gas Operator | Feb 2026 |
| 1247 | Apex Oil & Gas, Inc. | Houston, TX 77067 | Oil & Gas Operator | Oct 2009 |
| 1248 | Apex Oil Ventures Inc | | Oil & Gas Operator | Oct 2025 |
| 1249 | Apex Operating & Equip. Co. | Bowie, TX 76230 | Oil & Gas Operator | Nov 2003 |
| 1250 | Apex Operating Company, Inc. | Denver, CO 80202 | Gas Operator | Mar 2003 |
| 1251 | Apex Operating Partners, LLC | San Angelo, TX 76902 | Oil & Gas Operator | Feb 2026 |
| 1252 | Apex Production LTD. | Albany, TX 76430 | Oil Operator | Feb 2026 |
| 1253 | Apex Resources Inc | Allison Park, PA 15101-3838 | Oil & Gas Operator | Dec 1993 |
| 1254 | Apex Resources LLC | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2026 |
| 1255 | Apex Royalties, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 1997 |
| 1256 | Apexco Explor. & Prod., Inc. | | Oil & Gas Operator | May 1988 |
| 1257 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Oct 2025 |
| 1258 | Apexco-McCormick-Coastal | | Oil & Gas Operator | Dec 1977 |
| 1259 | Apexway Corp. | | Oil Operator | Dec 2024 |
| 1260 | API Operating Co. | Houston, TX 77036 | Oil & Gas Operator | Feb 2026 |
| 1261 | Apogee Oil & Gas LLC | Edmond, OK 73034 | Oil Operator | Oct 2025 |
| 1262 | Apollo 17 Oil And Gas Inc | | Oil Operator | Feb 1988 |
| 1263 | Apollo Drilling And Exploration | | Oil & Gas Operator | Oct 1980 |
| 1264 | Apollo Energies | Pratt, KS 67124 | Oil Operator | Aug 2016 |
| 1265 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 1266 | Apollo Energy Operating Co, LP | Lake Charles, LA 70601 | Oil & Gas Operator | Dec 2024 |
| 1267 | Apollo Energy Operating, LP | | Oil & Gas Operator | Mar 2011 |
| 1268 | Apollo Energy, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1269 | Apollo Energy, L.P. | Lake Charles, LA 70601 | Oil Operator | May 2014 |
| 1270 | Apollo Exploration And Development Inc | | Oil & Gas Operator | Aug 2025 |
| 1271 | Apollo Gas Co | Pittsburgh, PA 15236-1435 | Gas Operator | Dec 1991 |
| 1272 | Apollo Petroleum Corporation | | Oil & Gas Operator | Dec 2012 |
| 1273 | Apollo Resources LLC | Vintondale, PA 15961-0222 | Oil & Gas Operator | Dec 2025 |
| 1274 | App Energy, LLC | Monroe, MI 48161 | Oil & Gas Operator | Dec 2021 |
| 1275 | Appalachian Ener Tech Inc | Clearwater, FL 33518 | Oil & Gas Operator | Dec 2001 |
| 1276 | Appalachian Energy Inc | Pittsburgh, PA 15220 | Gas Operator | Dec 2008 |
| 1277 | Appalachian Energy Res LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2016 |
| 1278 | Appalachian Expl Inc | Hartville, OH 44632 | Oil & Gas Operator | Dec 1989 |
| 1279 | Appalachian Exploration Corp | McMurray, PA 15317-3452 | Gas Operator | Dec 1995 |
| 1280 | Appalachian Petrol Corp | Girard, OH 44420 | Oil & Gas Operator | Dec 1989 |
| 1281 | Appalachian Resources Of Florida, LLC | Fort Myers, FL 33902 | Oil Operator | Dec 2023 |
| 1282 | Appaloosa Operating Company LLC | The Woodlands, TX 77387 | Oil & Gas Operator | Apr 2019 |
| 1283 | Apple Petroleum Corp | Mountainside, NJ 7092 | Oil Operator | Mar 2013 |
| 1284 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 1285 | Applied Mechanics Corp. | Bridgeport, WV 26330-4609 | Oil & Gas Operator | Dec 2021 |
| 1286 | Appling, J. B. | Midland, TX 79702 | Oil & Gas Operator | Jul 1997 |
| 1287 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 1288 | Apr Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2022 |
| 1289 | April Rain Prod. Co., Inc. | | Oil & Gas Operator | Jul 1992 |
| 1290 | Apv Caddo Pine LLC | | Oil & Gas Operator | Dec 2024 |
| 1291 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Feb 2026 |
| 1292 | Apx & Assoc. | FT Stockton, TX 79735 | Oil & Gas Operator | Sep 1998 |
| 1293 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 1294 | Apx Western Corporation | Denver, CO 80217 | Oil & Gas Operator | Sep 1991 |
| 1295 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 1296 | Aquanyx Midstream LLC | Oklahoma City, OK 73131 | Oil Operator | Dec 2025 |
| 1297 | Aquarius Oil And Gas | Casper, WY 82601 | Oil & Gas Operator | Sep 2017 |
| 1298 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 1299 | Aquila Resources | Burkesville, KY 42717 | Oil & Gas Operator | Dec 2022 |
| 1300 | Aquinas Oil & Gas, LLC | Muenster, TX 76252 | Oil Operator | Feb 2026 |