| 1201 | Argonaut Energy | | Oil & Gas Operator | Aug 1991 |
| 1202 | Argonex Company LLC | | Oil & Gas Operator | Jan 2024 |
| 1203 | Argos Properties, Inc. | | Oil & Gas Operator | Apr 1992 |
| 1204 | Argosy | Carrollton, TX 75010 | Oil & Gas Operator | Aug 2003 |
| 1205 | Argosy Oil Company | | Gas Operator | Dec 1999 |
| 1206 | Argus Drilling, LLC | Midland, TX 79702 | Oil & Gas Operator | Mar 2008 |
| 1207 | Argus Production Company | Dallas, TX 75382 | Oil & Gas Operator | Nov 2023 |
| 1208 | Aria Operating LLC | | Oil Operator | Feb 2025 |
| 1209 | Arica Energy Company | Beggs, OK 74421 | Oil Operator | Jun 1994 |
| 1210 | Ariel Resources, Inc. | Dallas, TX 75287 | Oil & Gas Operator | May 1997 |
| 1211 | Aries Exploration Co Inc | Maud, OK 74854-0160 | Oil & Gas Operator | May 2013 |
| 1212 | Aries Oil & Gas Company, Inc. | | Oil Operator | Dec 1986 |
| 1213 | Aries Operating LP | Houston, TX 77042 | Oil & Gas Operator | Jun 2025 |
| 1214 | Aries Operating, LLC | Houston, TX 77010 | Oil & Gas Operator | Feb 2010 |
| 1215 | Aries Petroleum Corp. | Big Springs, WV 26137 | Oil & Gas Operator | Dec 2021 |
| 1216 | Arista Novelty, Inc. | Houston, TX 77256 | Oil & Gas Operator | Feb 1995 |
| 1217 | Aristata Exploration Co. | | Gas Operator | Dec 2009 |
| 1218 | Arizona Oil Comp | | Oil Operator | Oct 1984 |
| 1219 | Arjay Oil Company | Salt Lake City, UT 84110 | Oil & Gas Operator | May 2000 |
| 1220 | Ark Petroleum Inc. | Clyde, TX 79510 | Oil & Gas Operator | Nov 1997 |
| 1221 | Ark Resources Inc | Indiana, PA 15701-0069 | Oil & Gas Operator | Dec 2014 |
| 1222 | Ark Trust, Carol W Byrd Trustee | | Oil Operator | Apr 2025 |
| 1223 | Ark, Mary P. | Silver Creek, NY 14136 | Gas Operator | Dec 2023 |
| 1224 | Ark-La-Tex Anchor, Inc. | | Oil & Gas Operator | Mar 1999 |
| 1225 | Ark-La-Tex Energy Partners, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Jan 2013 |
| 1226 | Ark-La-Tex Energy, L.L.C. | Shreveport, LA 71101 | Oil & Gas Operator | Jun 2025 |
| 1227 | Ark-La-Tex Gas Gathering Co | | Oil Operator | Mar 2000 |
| 1228 | Ark-La-Tex Production, LLC | Doddridge, AR 71834 | Oil Operator | Jan 2025 |
| 1229 | Arkana Operating Company, Inc | Fort Worth, TX 76116-5707 | Oil & Gas Operator | Jul 2008 |
| 1230 | Arkies Well Service Inc | | Oil Operator | Aug 2009 |
| 1231 | Arkla Energy Resources | Shreveport, LA 71151 | Oil & Gas Operator | Mar 2015 |
| 1232 | Arkla Expl.Co & George E Woods | | Oil & Gas Operator | Dec 1992 |
| 1233 | Arkla Exploration Co. | Shreveport, LA 71151 | Oil & Gas Operator | Jan 1993 |
| 1234 | Arkla Petroleum LLC | | Oil & Gas Operator | May 2006 |
| 1235 | Arkland Producing Co Inc | Midland, TX 79701 | Oil & Gas Operator | Nov 2023 |
| 1236 | Arkland, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jul 1994 |
| 1237 | Arklatx Operating Company, Inc | Smackover, AR 71762 | Oil Operator | Jan 2025 |
| 1238 | Arkoma Gas Company | Edmond, OK 73003-5672 | Gas Operator | Apr 2010 |
| 1239 | Arkoma Holding Corporation | Oklahoma City, OK 73102-5684 | Gas Operator | Jul 2007 |
| 1240 | Arkoma Operations LLC | Tulsa, OK 74114-3502 | Oil & Gas Operator | Feb 2025 |
| 1241 | Arkoma Prod Co Of Texas, Inc. | Dallas, TX 75225 | Oil Operator | May 2004 |
| 1242 | Arkoma Production Company | Shreveport, LA 71101 | Gas Operator | Apr 2020 |
| 1243 | Arkoma Production Company Of California | | Oil & Gas Operator | Dec 1993 |
| 1244 | Arkoma Resources LLC | Henryetta, OK 74437 | Oil & Gas Operator | Mar 2025 |
| 1245 | Arkoma, Sandra | Pampa, TX 79066 | Oil & Gas Operator | May 1995 |
| 1246 | Arleand Resources | Overton, TX 75684 | Oil & Gas Operator | Jun 2025 |
| 1247 | Arledge & Young, Inc. | Weatherford, TX 76086 | Oil & Gas Operator | Feb 1999 |
| 1248 | Arledge, Terry | Rockdale, TX 76567 | Oil & Gas Operator | Sep 2019 |
| 1249 | Arlen Corporation | Houston, TX 77077 | Oil & Gas Operator | Mar 2008 |
| 1250 | Arlian, Inc. | Denver, CO 80202 | Oil Operator | Feb 1998 |
| 1251 | Arlington Storage Company, LLC | | Gas Operator | Dec 2008 |
| 1252 | Arlis Scogin | | Oil Operator | Jul 1985 |
| 1253 | Arlis Scogin Et Al | | Oil & Gas Operator | Jan 1990 |
| 1254 | Armac Resources | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2011 |
| 1255 | Armac Resources LLC | Washington, PA 15301-0558 | Oil & Gas Operator | Dec 2024 |
| 1256 | Armada Operating, LLC | Dallas, TX 75254 | Oil Operator | Aug 2015 |
| 1257 | Armadilla Oil & Gas, LLC | Madison, KS 66860 | Oil Operator | Jan 2025 |
| 1258 | Armca Oil & Gas LLC | | Oil Operator | Apr 2025 |
| 1259 | Armidillo Oil Company | Luling, TX 78648 | Oil & Gas Operator | Jun 2025 |
| 1260 | Armitage Jerald Dba Jem Oilfield Services LLC | Bartlesville, OK 74003 | Oil Operator | Feb 2025 |
| 1261 | Armor Energy II LLC | Tulsa, OK 74145 | Oil & Gas Operator | Mar 2025 |
| 1262 | Armor Energy LLC | Tulsa, OK 74146 | Oil & Gas Operator | Jun 2022 |
| 1263 | Armor Petroleum, Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jun 2025 |
| 1264 | Armor Resources LLC | Longview, TX 75604 | Oil & Gas Operator | Jun 2025 |
| 1265 | Armor SWD Inc | Oklahoma City, OK 73112 | Oil Operator | May 2020 |
| 1266 | Armour Properties | Houston, TX 77056 | Oil & Gas Operator | May 1994 |
| 1267 | Armour Resource Holdings, LTD. | Houston, TX 77046 | Oil & Gas Operator | Nov 1994 |
| 1268 | Armour, Widd | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 1269 | Armstrong & Jack | | Gas Operator | Jun 1997 |
| 1270 | Armstrong & McLeod Company | Okmulgee, OK 74447-0819 | Oil & Gas Operator | Dec 1993 |
| 1271 | Armstrong Energy Corporation | Roswell, NM 88202 | Oil & Gas Operator | Mar 2025 |
| 1272 | Armstrong Gas Co LLC | Kittanning, PA 16201-2269 | Oil & Gas Operator | Dec 2018 |
| 1273 | Armstrong Oil Inc. | | Oil & Gas Operator | Dec 2020 |
| 1274 | Armstrong Operating, Inc. | Dickinson, ND 58602 | Oil & Gas Operator | Apr 2025 |
| 1275 | Armstrong Petroleum Corporation | | Oil & Gas Operator | Mar 2025 |
| 1276 | Armstrong Robert D | New Matamoras, OH 45767 | Oil & Gas Operator | Dec 2024 |
| 1277 | Arnaudville Company Inc. | | Oil & Gas Operator | Apr 1995 |
| 1278 | Arnell Oil Company | Centennial, CO 80122 | Oil & Gas Operator | Apr 2025 |
| 1279 | Arnett Saltwater Disposal LLC | Shattuck, OK 73858-0848 | Oil Operator | Dec 2021 |
| 1280 | Arnold & Assoc-D&D-Coquina | | Oil Operator | Oct 1985 |
| 1281 | Arnold N Krebbs | | Oil Operator | Feb 2025 |
| 1282 | Arnold Oil Properties, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | May 2019 |
| 1283 | Arnold Oil Properties, L.L.C. | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 1284 | Arnold Prodn. | | Oil & Gas Operator | Jan 2006 |
| 1285 | Arnold Ridge LLC | | Oil Operator | Dec 2023 |
| 1286 | Arnot Oil Company, LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jun 2025 |
| 1287 | Arnot, W. G., Jr. | Breckenridge, TX 76424 | Oil & Gas Operator | Jan 2017 |
| 1288 | Aroc (Texas) Inc | Houston, TX 77090 | Oil & Gas Operator | Dec 2014 |
| 1289 | Arp Barnett, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2018 |
| 1290 | Arp Oklahoma LLC | Fort Worth, TX 76102-7426 | Oil & Gas Operator | Feb 2020 |
| 1291 | Arp Operating, LLC | Denver, CO 80202 | Oil Operator | Feb 2025 |
| 1292 | Arp Production Company, LLC | Fort Worth, TX 76102 | Gas Operator | Mar 2025 |
| 1293 | Arpel, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2014 |
| 1294 | Arps Petroleum C | | Oil Operator | Jul 1987 |
| 1295 | Array Operating, LLC | | Oil & Gas Operator | Mar 2017 |
| 1296 | Arrco Operating, LLC | Carrizo SPGS, TX 78834 | Oil & Gas Operator | Jun 2025 |
| 1297 | Arrington CJM, Inc. | Canadian, TX 79014 | Oil & Gas Operator | Nov 2021 |
| 1298 | Arrington David Oil & Gas Inc | Midland, TX 79702-2071 | Oil & Gas Operator | Dec 2014 |
| 1299 | Arrington Oil&Gas Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Jun 2025 |
| 1300 | Arrington Production Company | Pampa, TX 79066 | Oil & Gas Operator | Jun 2025 |