| 1201 | Apollo Energies | Pratt, KS 67124 | Oil Operator | Aug 2016 |
| 1202 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Feb 2026 |
| 1203 | Apollo Energy Operating Co, LP | Lake Charles, LA 70601 | Oil & Gas Operator | Dec 2024 |
| 1204 | Apollo Energy Operating, LP | | Oil & Gas Operator | Mar 2011 |
| 1205 | Apollo Energy, L.L.C. | | Oil & Gas Operator | Jul 2018 |
| 1206 | Apollo Energy, L.P. | Lake Charles, LA 70601 | Oil Operator | May 2014 |
| 1207 | Apollo Exploration And Development Inc | | Oil & Gas Operator | Jan 2026 |
| 1208 | Apollo Gas Co | Pittsburgh, PA 15236-1435 | Gas Operator | Dec 1991 |
| 1209 | Apollo Petroleum Corporation | | Oil & Gas Operator | Dec 2012 |
| 1210 | Apollo Resources LLC | Vintondale, PA 15961-0222 | Oil & Gas Operator | Mar 2026 |
| 1211 | App Energy, LLC | Monroe, MI 48161 | Oil & Gas Operator | Dec 2021 |
| 1212 | Appalachian Ener Tech Inc | Clearwater, FL 33518 | Oil & Gas Operator | Dec 2001 |
| 1213 | Appalachian Energy Inc | Pittsburgh, PA 15220 | Gas Operator | Dec 2008 |
| 1214 | Appalachian Expl Inc | Hartville, OH 44632 | Oil & Gas Operator | Dec 1989 |
| 1215 | Appalachian Exploration Corp | McMurray, PA 15317-3452 | Gas Operator | Dec 1995 |
| 1216 | Appalachian Petrol Corp | Girard, OH 44420 | Oil & Gas Operator | Dec 1989 |
| 1217 | Appalachian Resources Of Florida, LLC | Fort Myers, FL 33902 | Oil & Gas Operator | Dec 2024 |
| 1218 | Appaloosa Operating Company LLC | The Woodlands, TX 77387 | Oil & Gas Operator | Apr 2019 |
| 1219 | Apple Petroleum Corp | Mountainside, NJ 7092 | Oil Operator | Mar 2013 |
| 1220 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 1221 | Applied Mechanics Corp. | Bridgeport, WV 26330-4609 | Oil & Gas Operator | Dec 2021 |
| 1222 | Appling, J. B. | Midland, TX 79702 | Oil & Gas Operator | Jul 1997 |
| 1223 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 1224 | Apr Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2022 |
| 1225 | April Rain Prod. Co., Inc. | | Oil & Gas Operator | Jul 1992 |
| 1226 | Apv Caddo Pine LLC | | Oil & Gas Operator | Dec 2024 |
| 1227 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Jun 2026 |
| 1228 | Apx & Assoc. | FT Stockton, TX 79735 | Oil & Gas Operator | Sep 1998 |
| 1229 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 1230 | Apx Western Corporation | Denver, CO 80217 | Oil & Gas Operator | Sep 1991 |
| 1231 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 1232 | Aquanyx Midstream LLC | Oklahoma City, OK 73131 | Oil Operator | Mar 2026 |
| 1233 | Aquarius Oil And Gas | Casper, WY 82601 | Oil & Gas Operator | Sep 2017 |
| 1234 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 1235 | Aquila Resources | Burkesville, KY 42717 | Oil & Gas Operator | Dec 2022 |
| 1236 | Aquinas Oil & Gas, LLC | Muenster, TX 76252 | Oil Operator | Jun 2026 |
| 1237 | Arabella Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2026 |
| 1238 | Arabella Petroleum Company, LLC | Austin, TX 78701 | Oil & Gas Operator | Jun 2026 |
| 1239 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Apr 2025 |
| 1240 | Aracca Petroleum Company | | Oil Operator | May 1984 |
| 1241 | Aracca Petroleum Corporation | | Oil Operator | Dec 1987 |
| 1242 | Aralpa Corporation | | Oil & Gas Operator | May 1987 |
| 1243 | Araluen Energy, Inc. | Houston, TX 77094 | Oil Operator | Jun 2022 |
| 1244 | Aramco Petroleum LLC | Burkburnett, TX 76354 | Oil Operator | Dec 2025 |
| 1245 | Aran Energy USA Inc. | | Oil & Gas Operator | Apr 1997 |
| 1246 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 1247 | Aransas Oil Company, Inc. | San Antonio, TX 78253 | Oil & Gas Operator | Jan 1999 |
| 1248 | Aransas Resources, Inc | Houston, TX 77083 | Oil & Gas Operator | Dec 2005 |
| 1249 | Aransas Resources, LP | Houston, TX 77006 | Oil & Gas Operator | Oct 2006 |
| 1250 | Arapaho Oil & Gas Inc | Roswell, NM 88202 | Oil & Gas Operator | Nov 1994 |
| 1251 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 1252 | Arapaho Ventures Of Ny | Englewood, CO 80155 | Oil & Gas Operator | Dec 1990 |
| 1253 | Arapahoe Prod. Co. | Borger, TX 79008 | Oil & Gas Operator | May 2012 |
| 1254 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Mar 2026 |
| 1255 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 1256 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 1257 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 1258 | Arb Energy Utah, LLC | Katy, TX 77494 | Oil & Gas Operator | Dec 2025 |
| 1259 | Arbco, Inc. | | Oil & Gas Operator | Jan 1996 |
| 1260 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Jun 2026 |
| 1261 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Jun 2026 |
| 1262 | Arbor Operating LLC | | Oil & Gas Operator | Jan 2026 |
| 1263 | Arbor Petroleum Corporation | Oklahoma City, OK 73102-4003 | Oil & Gas Operator | Mar 2011 |
| 1264 | Arbor Petroleum Inc | | Oil Operator | Jan 2003 |
| 1265 | Arbor Resources LLC | | Oil & Gas Operator | Dec 2007 |
| 1266 | Arbuckle Energy Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 1267 | Arbuckle Enterprises Inc | Edmond, OK 73083 | Oil & Gas Operator | Feb 2026 |
| 1268 | Arbuckle Service | Iola, KS 66749 | Oil Operator | Feb 1993 |
| 1269 | Arbuckle, A. Dale | Grenola, KS 67346 | Oil Operator | Sep 1990 |
| 1270 | Arbuckle, A. Dale & Kathryn E. Rev Trust | Grenola, KS 67346 | Oil & Gas Operator | May 2024 |
| 1271 | Arcadia Energy Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Jun 2026 |
| 1272 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 1273 | Arcadia Oil Company | Edmond, OK 73013-9009 | Oil & Gas Operator | Oct 2015 |
| 1274 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Jun 2026 |
| 1275 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 1276 | Arcadian Mineral Development | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2013 |
| 1277 | Arcadian Mineral Development,LLC | Brownwood, TX 76801 | Oil & Gas Operator | Jun 2026 |
| 1278 | Arcadian Resources LLC | Glen Elder, KS 67446 | Oil & Gas Operator | Jun 2026 |
| 1279 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 1280 | Arcana Energy Corp Inc | Bartlesville, OK 74006 | Oil Operator | May 2017 |
| 1281 | Arch Bend Oil & Gas Operators, LLC | | Oil Operator | Jan 2025 |
| 1282 | Arch Oil & Gas, LLC | Ennis, TX 75119 | Oil & Gas Operator | Jun 2026 |
| 1283 | Arch Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1994 |
| 1284 | Arch Operating, LLC | Wichita Falls, TX 76307 | Oil Operator | Jun 2026 |
| 1285 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 1286 | Archer Drilling & Prod. Co. | Archer City, TX 76351 | Oil & Gas Operator | Nov 2002 |
| 1287 | Archer Petroleum | Frisco, TX 75034 | Oil & Gas Operator | Aug 2021 |
| 1288 | Archer Reef Oil Co. | Bellevue, TX 76228 | Oil & Gas Operator | Jun 2026 |
| 1289 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 1290 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Mar 2024 |
| 1291 | Archer,Carl M Estate Partnership | Gruver, TX 79040 | Oil & Gas Operator | Sep 2022 |
| 1292 | Archibald Oil & Gas Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Feb 2026 |
| 1293 | Archon Resources LLC | Houston, TX 77074 | Oil & Gas Operator | Jan 2015 |
| 1294 | Arco Alaska Inc. | | Oil & Gas Operator | Dec 2000 |
| 1295 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 1296 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 1297 | Arco Oil & Gas Co., Div. Of Atlantic Richfield | | Oil & Gas Operator | Jul 1992 |
| 1298 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 1299 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 1300 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |