| 1201 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 1202 | Applied Mechanics Corp. | Bridgeport, WV 26330-4609 | Oil & Gas Operator | Dec 2021 |
| 1203 | Appling, J. B. | Midland, TX 79702 | Oil & Gas Operator | Jul 1997 |
| 1204 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 1205 | Apr Operating LLC | Midland, TX 79701 | Oil & Gas Operator | May 2024 |
| 1206 | April Rain Prod. Co., Inc. | | Oil & Gas Operator | Jul 1992 |
| 1207 | Apv Caddo Pine LLC | | Oil & Gas Operator | Nov 2023 |
| 1208 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | May 2024 |
| 1209 | Apx & Assoc. | FT Stockton, TX 79735 | Oil & Gas Operator | Sep 1998 |
| 1210 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 1211 | Apx Western Corporation | Denver, CO 80217 | Oil & Gas Operator | Sep 1991 |
| 1212 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 1213 | Aquanyx Midstream LLC | | Oil Operator | Feb 2024 |
| 1214 | Aquarius Oil And Gas | Casper, WY 82601 | Oil & Gas Operator | Sep 2017 |
| 1215 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 1216 | Aquila Resources | Burkesville, KY 42717 | Oil & Gas Operator | Dec 2022 |
| 1217 | Aquinas Oil & Gas, LLC | Muenster, TX 76252 | Oil Operator | May 2024 |
| 1218 | Arabella Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | May 2024 |
| 1219 | Arabella Petroleum Company, LLC | Austin, TX 78701 | Oil & Gas Operator | May 2024 |
| 1220 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | May 2024 |
| 1221 | Aracca Petroleum Company | | Oil Operator | May 1984 |
| 1222 | Aracca Petroleum Corporation | | Oil Operator | Dec 1987 |
| 1223 | Aralpa Corporation | | Oil & Gas Operator | May 1987 |
| 1224 | Araluen Energy, Inc. | Houston, TX 77094 | Oil Operator | Jun 2022 |
| 1225 | Aramco Petroleum LLC | Burkburnett, TX 76354 | Oil Operator | May 2024 |
| 1226 | Aran Energy USA Inc. | | Oil & Gas Operator | Apr 1997 |
| 1227 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 1228 | Aransas Oil Company, Inc. | San Antonio, TX 78253 | Oil & Gas Operator | Jan 1999 |
| 1229 | Aransas Resources, Inc | Houston, TX 77083 | Oil & Gas Operator | Dec 2005 |
| 1230 | Aransas Resources, LP | Houston, TX 77006 | Oil & Gas Operator | Oct 2006 |
| 1231 | Arapaho Oil & Gas Inc | Roswell, NM 88202 | Oil & Gas Operator | Nov 1994 |
| 1232 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 1233 | Arapaho Ventures Of Ny | Englewood, CO 80155 | Oil & Gas Operator | Dec 1990 |
| 1234 | Arapahoe Prod. Co. | Borger, TX 79008 | Oil & Gas Operator | May 2012 |
| 1235 | Arapahoe Resources LLC | Oklahoma City, OK 73157-7107 | Oil & Gas Operator | Jan 2024 |
| 1236 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 1237 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 1238 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 1239 | Arb Energy Utah, LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2024 |
| 1240 | Arbco, Inc. | Lafayette, LA 70505 | Oil & Gas Operator | Jan 1996 |
| 1241 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | May 2024 |
| 1242 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | May 2024 |
| 1243 | Arbor Operating LLC | | Oil & Gas Operator | Dec 2023 |
| 1244 | Arbor Petroleum Corporation | Oklahoma City, OK 73102-4003 | Oil & Gas Operator | Mar 2011 |
| 1245 | Arbor Petroleum Inc | | Oil Operator | Jan 2003 |
| 1246 | Arbor Resources LLC | | Oil & Gas Operator | Dec 2007 |
| 1247 | Arbuckle Energy Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jul 2018 |
| 1248 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jan 2024 |
| 1249 | Arbuckle Service | Iola, KS 66749 | Oil Operator | Feb 1993 |
| 1250 | Arbuckle, A. Dale | Grenola, KS 67346 | Oil Operator | Sep 1990 |
| 1251 | Arbuckle, A. Dale & Kathryn E. Rev Trust | Grenola, KS 67346 | Oil & Gas Operator | Aug 2016 |
| 1252 | Arc Energy Inc. | Dallas, TX 75227 | Oil Operator | May 2024 |
| 1253 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 1254 | Arcadia Oil Company | Edmond, OK 73013-9009 | Oil & Gas Operator | Oct 2015 |
| 1255 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | May 2024 |
| 1256 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 1257 | Arcadian Mineral Development | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2013 |
| 1258 | Arcadian Mineral Development,LLC | Brownwood, TX 76801 | Oil & Gas Operator | May 2024 |
| 1259 | Arcadian Resources, LLC | Glen Elder, KS 67446 | Oil & Gas Operator | Jan 2024 |
| 1260 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 1261 | Arcana Energy Corp Inc | Bartlesville, OK 74006 | Oil Operator | May 2017 |
| 1262 | Arch Bend Oil & Gas Operators, LLC | | Oil Operator | Jan 2024 |
| 1263 | Arch Oil & Gas LLC | Dallas, TX 75254 | Oil & Gas Operator | May 2024 |
| 1264 | Arch Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1994 |
| 1265 | Arch Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | May 2024 |
| 1266 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 1267 | Archer Drilling & Prod. Co. | Archer City, TX 76351 | Oil & Gas Operator | Nov 2002 |
| 1268 | Archer Petroleum | Frisco, TX 75034 | Oil & Gas Operator | Aug 2021 |
| 1269 | Archer Reef Oil Co. | Bellevue, TX 76228 | Oil & Gas Operator | May 2024 |
| 1270 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 1271 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Mar 2024 |
| 1272 | Archer,Carl M Estate Partnership | Gruver, TX 79040 | Oil & Gas Operator | Sep 2022 |
| 1273 | Archibald Oil & Gas Operating Inc | Ada, OK 74821-0305 | Oil & Gas Operator | Feb 2024 |
| 1274 | Archon Resources LLC | Houston, TX 77074 | Oil & Gas Operator | Jan 2015 |
| 1275 | Arco Alaska Inc. | | Oil & Gas Operator | Dec 2001 |
| 1276 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 1277 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 1278 | Arco Oil & Gas Co., Div. Of Atlantic Richfield | | Oil & Gas Operator | Jul 1992 |
| 1279 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 1280 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 1281 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 1282 | Arco Permian, A Div Of Atlantic Richfield Company | | Gas Operator | Dec 2001 |
| 1283 | Arco Pipe Line Company | Independence, KS 67301 | Oil & Gas Operator | Jun 1996 |
| 1284 | Arco Western Energy Co. | | Oil & Gas Operator | Dec 1999 |
| 1285 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | May 2024 |
| 1286 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Feb 2024 |
| 1287 | Arcturus Oil Cor | | Oil Operator | Oct 1989 |
| 1288 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | May 2024 |
| 1289 | Ard Drilling Company Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2000 |
| 1290 | Ard, Julian | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2002 |
| 1291 | Ardc Inc. | Hays, KS 67601 | Oil Operator | Jan 2024 |
| 1292 | Arden Energy Partners, Inc. | San Angelo, TX 76906 | Oil & Gas Operator | Feb 2013 |
| 1293 | Ardent Energy LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | May 2024 |
| 1294 | Ardent Resources, Inc. | Upper St Clair, PA 15241-1633 | Oil & Gas Operator | Dec 2018 |
| 1295 | Ardmore Production & Exploration Co | Ardmore, OK 73402-1988 | Oil & Gas Operator | Feb 2024 |
| 1296 | Area Management Corp | Prairie VIllage, KS 66207 | Oil Operator | Dec 2019 |
| 1297 | Area Pipe And Equipment | Midland, TX 79702 | Oil & Gas Operator | Apr 2003 |
| 1298 | Arena Offshore, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Mar 2009 |
| 1299 | Arena Production Company | Midland, TX 79710 | Oil & Gas Operator | May 2024 |
| 1300 | Arena Resources Inc | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |