| 1101 | Annex Oil Corp | | Oil & Gas Operator | Jun 2000 |
| 1102 | Annona Productions, Inc. | | Gas Operator | May 2019 |
| 1103 | Anr Limited Inc/Coastal | Houston, TX 770460995 | Oil & Gas Operator | Dec 1987 |
| 1104 | Anr Production Company | Houston, TX 77046 | Oil & Gas Operator | Aug 2017 |
| 1105 | Ansbro Petroleum Company, LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2008 |
| 1106 | Anschutz Corporation | Denver, CO 80202 | Oil & Gas Operator | Sep 2016 |
| 1107 | Anschutz Drilling Co. | | Oil Operator | Jul 1961 |
| 1108 | Anschutz Exploration Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2026 |
| 1109 | Anschutz Oil Co. | | Oil & Gas Operator | Jul 1984 |
| 1110 | Anschutz Oil Company LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2020 |
| 1111 | Anschutz Pinedale Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2015 |
| 1112 | Anshutz Oil | | Oil Operator | Dec 2009 |
| 1113 | Anson Charles Dba Anson Oil | Seminole, OK 74868 | Oil Operator | Feb 2026 |
| 1114 | Anson Company | Oklahoma City, OK 73124 | Oil & Gas Operator | Apr 2018 |
| 1115 | Anson Gas Corporation | Oklahoma City, OK 73116 | Oil & Gas Operator | May 1997 |
| 1116 | Anson J W | Seminole, OK 74818-1280 | Oil & Gas Operator | Oct 2020 |
| 1117 | Anson Robert L & Teresa M | Seminole, OK 74868 | Oil & Gas Operator | Feb 2026 |
| 1118 | Anstine & Musgrove Inc | Ponca City, OK 74602 | Oil & Gas Operator | Mar 2026 |
| 1119 | Anstine Oil Company | | Oil Operator | Jan 2026 |
| 1120 | Anstine-Musgrove | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2017 |
| 1121 | Anstine-Musgrove Oil Company | Ponca City, OK 74602-0391 | Oil & Gas Operator | Jan 2013 |
| 1122 | Ansythe Exploration Co., Inc. | | Oil & Gas Operator | Oct 1982 |
| 1123 | Ant Hills Production | Lusk, WY 82225 | Oil & Gas Operator | Dec 2025 |
| 1124 | Antara Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Apr 2004 |
| 1125 | Antares Energy Company | Houston, TX 77010 | Oil & Gas Operator | May 2026 |
| 1126 | Antares Oil Corp | Denver, CO 80202 | Oil & Gas Operator | Oct 2015 |
| 1127 | Antares Ventures, L.L.C. | | Oil Operator | Oct 2016 |
| 1128 | Antelope Energy Company LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 1129 | Antelope Energy Partners, LLC | Houston, TX 77027 | Oil & Gas Operator | May 2026 |
| 1130 | Antelope Production Co. | Midland, TX 79701 | Oil & Gas Operator | Oct 1995 |
| 1131 | Antelope Resources Inc | Billings, MT 59101 | Oil & Gas Operator | May 2017 |
| 1132 | Antero Energy LLC | Denver, CO 80202 | Gas Operator | Nov 2003 |
| 1133 | Antero Resources Bluestone LLC | | Gas Operator | Dec 2013 |
| 1134 | Antero Resources Corporation | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 1135 | Antero Resources I, LP | Denver, CO 80202 | Oil & Gas Operator | Jun 2005 |
| 1136 | Antero Resources II, LP | Denver, CO 80202 | Oil & Gas Operator | May 2006 |
| 1137 | Anterra Energy Services Inc. | | Oil & Gas Operator | Dec 2025 |
| 1138 | Anterra Services Inc. | | Oil & Gas Operator | Dec 2025 |
| 1139 | Anthem Energy Operating (Oklahoma) LLC | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2026 |
| 1140 | Anthony Oil & Gas Co. | Shreveport, LA 71135 | Oil Operator | May 1993 |
| 1141 | Anthony Oil Company | | Oil & Gas Operator | Oct 1987 |
| 1142 | Anthony, Bob G. Inc. | Brookhaven, MS 39601 | Oil & Gas Operator | May 2026 |
| 1143 | Antilley, Joe | Abilene, TX 79602 | Oil & Gas Operator | Jan 2024 |
| 1144 | Antioch Disposal Well Inc | Duncan, OK 73533 | Oil Operator | Jan 1994 |
| 1145 | Antioch Operating LLC | Dallas, TX 75206 | Oil & Gas Operator | Mar 2026 |
| 1146 | Antle Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2026 |
| 1147 | Antle, E. | Graham, TX 76450 | Oil & Gas Operator | Oct 1994 |
| 1148 | Antler Energy LLC | Baggs, WY 82321 | Oil & Gas Operator | Feb 2026 |
| 1149 | Antlers Energy LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 1150 | Antrim Development Corp | | Oil & Gas Operator | Oct 2018 |
| 1151 | Anvil Oil Co., Inc. | Bartlesville, OK 74003-5030 | Oil & Gas Operator | Dec 2008 |
| 1152 | Aoco Operating Company, L.L.C. | Houston, TX 77008 | Oil & Gas Operator | Feb 2005 |
| 1153 | Aoco Operating, L.P. | Houston, TX 77008 | Oil & Gas Operator | Mar 2008 |
| 1154 | Aocswd LLC | Marietta, OH 45750 | Oil & Gas Operator | Dec 2024 |
| 1155 | Aog Operating LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Feb 2026 |
| 1156 | Aog, Inc. | Norman, OK 73070 | Oil & Gas Operator | Nov 2014 |
| 1157 | Aogp, LLC | Turtle Lake, WI 54889 | Oil & Gas Operator | Sep 2019 |
| 1158 | Aop Operating Corporation | Dallas, TX 75313 | Oil & Gas Operator | Aug 2003 |
| 1159 | Ap Operating LLC | Claflin, KS 67525 | Oil Operator | Jan 2026 |
| 1160 | Ap Operating, Inc. | Richardson, TX 75080 | Oil & Gas Operator | May 2026 |
| 1161 | Ap Production LLC | Utica, OH 43080 | Oil & Gas Operator | Dec 2025 |
| 1162 | Apache Corporation | Houston, TX 77042 | Oil & Gas Operator | May 2026 |
| 1163 | Apache Drilling | | Oil Operator | Sep 1994 |
| 1164 | Apache Drilling Co | Kingman, KS 67068 | Oil Operator | Feb 2006 |
| 1165 | Apache Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Mar 2015 |
| 1166 | Apache Natural Gas Co., Inc. | | Oil Operator | Nov 1992 |
| 1167 | Apache Oil Company | San Antonio, TX 78227 | Oil & Gas Operator | Jun 2023 |
| 1168 | Apache PHN North America, Inc. | | Oil & Gas Operator | Mar 2005 |
| 1169 | Apache Production Company | Holliday, TX 76366 | Oil & Gas Operator | May 2026 |
| 1170 | Apache Shelf, Inc. | Houston, TX 77056 | Oil & Gas Operator | Jan 2014 |
| 1171 | Apb Oil Corporation | Houston, TX 77052 | Oil & Gas Operator | Apr 1996 |
| 1172 | Apc Operating Partnership | Tulsa, OK 74136 | Oil & Gas Operator | Oct 1996 |
| 1173 | Apc Operating Partnership LP | Tulsa, OK 74136-4224 | Oil & Gas Operator | Jun 2015 |
| 1174 | Apco Oil Corp | Oklahoma City, OK 73116 | Oil & Gas Operator | Jun 1993 |
| 1175 | Apd Company | | Oil & Gas Operator | Apr 1987 |
| 1176 | Apex Crude Oil Co | Logan, OH 43138 | Oil & Gas Operator | Dec 1996 |
| 1177 | Apex DRLG | Bermuda Dunes, CA 92203 | Oil & Gas Operator | Dec 2019 |
| 1178 | Apex Energy (Pa) LLC | Canonsburg, PA 15317-6523 | Gas Operator | May 2025 |
| 1179 | Apex Energy, Inc. | Corpus Christ, TX 78413 | Oil & Gas Operator | May 2026 |
| 1180 | Apex Energy, L.L.C. | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2026 |
| 1181 | Apex Minerals Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 1994 |
| 1182 | Apex Natural Gas, LLC | Houston, TX 77002 | Gas Operator | May 2026 |
| 1183 | Apex Oil & Gas, Inc. | Houston, TX 77067 | Oil & Gas Operator | Oct 2009 |
| 1184 | Apex Oil Ventures Inc | | Oil & Gas Operator | Feb 2026 |
| 1185 | Apex Operating & Equip. Co. | Bowie, TX 76230 | Oil & Gas Operator | Nov 2003 |
| 1186 | Apex Operating Partners, LLC | San Angelo, TX 76902 | Oil & Gas Operator | May 2026 |
| 1187 | Apex Production LTD. | Albany, TX 76430 | Oil Operator | May 2026 |
| 1188 | Apex Resources Inc | Allison Park, PA 15101-3838 | Oil & Gas Operator | Dec 1993 |
| 1189 | Apex Resources LLC | Kilgore, TX 75663 | Oil & Gas Operator | May 2026 |
| 1190 | Apex Royalties, Inc. | Midland, TX 79702 | Oil & Gas Operator | May 1997 |
| 1191 | Apexco, Inc. | Sand Springs, OK 74063 | Oil & Gas Operator | Oct 2025 |
| 1192 | Apexco-McCormick-Coastal | | Oil & Gas Operator | Dec 1977 |
| 1193 | Apexway Corp. | | Oil Operator | Dec 2024 |
| 1194 | API Operating Co. | Houston, TX 77036 | Oil & Gas Operator | May 2026 |
| 1195 | Apogee Oil & Gas LLC | Edmond, OK 73034 | Oil Operator | Dec 2025 |
| 1196 | Apollo 17 Oil And Gas Inc | | Oil Operator | Feb 1988 |
| 1197 | Apollo Drilling And Exploration | | Oil & Gas Operator | Oct 1980 |
| 1198 | Apollo Energies | Pratt, KS 67124 | Oil Operator | Aug 2016 |
| 1199 | Apollo Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Jan 2026 |
| 1200 | Apollo Energy Operating Co, LP | Lake Charles, LA 70601 | Oil & Gas Operator | Dec 2024 |