| 1101 | Appalachian Energy Inc | Pittsburgh, PA 15220 | Gas Operator | Dec 2008 |
| 1102 | Appalachian Energy Res LLC | Lower Salem, OH 45745 | Oil & Gas Operator | Dec 2016 |
| 1103 | Appalachian Expl Inc | Hartville, OH 44632-550-550 | Oil & Gas Operator | Dec 1992 |
| 1104 | Appalachian Exploration Corp | McMurray, PA 15317-3452 | Gas Operator | Dec 1995 |
| 1105 | Appalachian Petrol Corp | Girard, OH 44420 | Oil & Gas Operator | Dec 1989 |
| 1106 | Appalachian Resources Of Florida, LLC | Fort Myers, FL 33902 | Oil Operator | Dec 2023 |
| 1107 | Appaloosa Operating Company LLC | The Woodlands, TX 77387 | Oil & Gas Operator | Apr 2019 |
| 1108 | Apple Petroleum Corp | Mountainside, NJ 7092 | Oil Operator | Mar 2013 |
| 1109 | Appleton Oil Company | Chicago, IL 60657-4097 | Oil & Gas Operator | May 1993 |
| 1110 | Applied Mechanics Corp. | Bridgeport, WV 26330-4609 | Oil & Gas Operator | Dec 2021 |
| 1111 | Appling, J. B. | Midland, TX 79702 | Oil & Gas Operator | Jul 1997 |
| 1112 | Approach Operating LLC | Fort Worth, TX 76116 | Oil & Gas Operator | Sep 2020 |
| 1113 | Apr Operating LLC | Midland, TX 79701 | Oil & Gas Operator | Jun 2022 |
| 1114 | April Rain Prod. Co., Inc. | | Oil & Gas Operator | Jul 1992 |
| 1115 | Apv Caddo Pine LLC | | Oil & Gas Operator | Dec 2024 |
| 1116 | Apv McCamey LLC | MC Camey, TX 79752 | Oil & Gas Operator | Apr 2025 |
| 1117 | Apx & Assoc. | FT Stockton, TX 79735 | Oil & Gas Operator | Sep 1998 |
| 1118 | Apx Corporation | Houston, TX 77251 | Oil & Gas Operator | Dec 2009 |
| 1119 | Apx Western Corporation | Denver, CO 80217 | Oil & Gas Operator | Sep 1991 |
| 1120 | Aqua-Oil Inc | Enid, OK 73703-6511 | Oil & Gas Operator | May 2019 |
| 1121 | Aquarius Oil And Gas | Casper, WY 82601 | Oil & Gas Operator | Sep 2017 |
| 1122 | Aquila Energy Resources Corp. | Houston, TX 77042 | Oil & Gas Operator | Nov 2013 |
| 1123 | Aquila Resources | Burkesville, KY 42717 | Oil & Gas Operator | Dec 2022 |
| 1124 | Aquinas Oil & Gas, LLC | Muenster, TX 76252 | Oil Operator | Apr 2025 |
| 1125 | Arabella Operating, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 1126 | Arabella Petroleum Company, LLC | Austin, TX 78701 | Oil & Gas Operator | Apr 2025 |
| 1127 | Arabie, Inc. | Lake Charles, LA 70605 | Oil & Gas Operator | Apr 2025 |
| 1128 | Aracca Petroleum Company | | Oil Operator | May 1984 |
| 1129 | Aracca Petroleum Corporation | | Oil Operator | Dec 1987 |
| 1130 | Aralpa Corporation | | Oil & Gas Operator | May 1987 |
| 1131 | Araluen Energy, Inc. | Houston, TX 77094 | Oil Operator | Jun 2022 |
| 1132 | Aramco Petroleum LLC | Burkburnett, TX 76354 | Oil Operator | Apr 2025 |
| 1133 | Aran Energy USA Inc. | | Oil & Gas Operator | Apr 1997 |
| 1134 | Aransas DRLG & Workover Co Inc | Corpus Chrsti, TX 78409 | Oil & Gas Operator | Jul 2019 |
| 1135 | Aransas Oil Company, Inc. | San Antonio, TX 78253 | Oil & Gas Operator | Jan 1999 |
| 1136 | Aransas Resources, Inc | Houston, TX 77083 | Oil & Gas Operator | Dec 2005 |
| 1137 | Aransas Resources, LP | Houston, TX 77006 | Oil & Gas Operator | Oct 2006 |
| 1138 | Arapaho Oil & Gas Inc | Roswell, NM 88202 | Oil & Gas Operator | Nov 1994 |
| 1139 | Arapaho Petroleum Inc | Englewood, CO 80155 | Oil & Gas Operator | Nov 1998 |
| 1140 | Arapaho Ventures Of Ny | Englewood, CO 80155 | Oil & Gas Operator | Dec 1990 |
| 1141 | Arapahoe Prod. Co. | Borger, TX 79008 | Oil & Gas Operator | May 2012 |
| 1142 | Arapahoe Resources LLC | Oklahoma City, OK 73118 | Oil & Gas Operator | Jan 2025 |
| 1143 | Arapahoe SPV LLC | | Oil & Gas Operator | Feb 2023 |
| 1144 | Aratex Production Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2003 |
| 1145 | Araxas Exploration, Inc. | The Woodlands, TX 77380 | Oil & Gas Operator | Apr 1998 |
| 1146 | Arb Energy Utah, LLC | Katy, TX 77494 | Oil & Gas Operator | Jan 2025 |
| 1147 | Arbco, Inc. | | Oil & Gas Operator | Jan 1996 |
| 1148 | Arben Oil, Inc. | Coleman, TX 76834 | Oil & Gas Operator | Apr 2025 |
| 1149 | Arbol Resources, Inc. | Houston, TX 77079 | Oil & Gas Operator | Apr 2025 |
| 1150 | Arbor Operating LLC | | Oil & Gas Operator | Mar 2024 |
| 1151 | Arbor Petroleum Corporation | Oklahoma City, OK 73102-4003 | Oil & Gas Operator | Mar 2011 |
| 1152 | Arbor Petroleum Inc | | Oil Operator | Jan 2003 |
| 1153 | Arbor Resources LLC | | Oil & Gas Operator | Dec 2007 |
| 1154 | Arbuckle Energy Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jul 2018 |
| 1155 | Arbuckle Enterprises, Inc. | Edmond, OK 73083 | Oil & Gas Operator | Jan 2025 |
| 1156 | Arbuckle Service | Iola, KS 66749 | Oil Operator | Feb 1993 |
| 1157 | Arbuckle, A. Dale | Grenola, KS 67346 | Oil Operator | Sep 1990 |
| 1158 | Arbuckle, A. Dale & Kathryn E. Rev Trust | Grenola, KS 67346 | Oil & Gas Operator | May 2024 |
| 1159 | Arcadia Energy Resources, LLC | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2025 |
| 1160 | Arcadia Expl. & Prod. Company | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2011 |
| 1161 | Arcadia Oil Company | Edmond, OK 73013-9009 | Oil & Gas Operator | Oct 2015 |
| 1162 | Arcadia Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Apr 2025 |
| 1163 | Arcadia Refining Company | Tyler, TX 75701 | Oil & Gas Operator | Jan 1994 |
| 1164 | Arcadian Mineral Development | Brownwood, TX 76801 | Oil & Gas Operator | Dec 2013 |
| 1165 | Arcadian Mineral Development,LLC | Brownwood, TX 76801 | Oil & Gas Operator | Apr 2025 |
| 1166 | Arcadian Resources LLC | Glen Elder, KS 67446 | Oil & Gas Operator | Apr 2025 |
| 1167 | Arcady Oil Company | | Gas Operator | Dec 1989 |
| 1168 | Arcana Energy Corp Inc | Bartlesville, OK 74006 | Oil Operator | May 2017 |
| 1169 | Arch Bend Oil & Gas Operators, LLC | | Oil Operator | Jan 2025 |
| 1170 | Arch Oil & Gas, LLC | Dallas, TX 75254 | Oil & Gas Operator | Apr 2025 |
| 1171 | Arch Oil And Gas Company | Midland, TX 79702 | Oil & Gas Operator | Feb 1994 |
| 1172 | Arch Operating, LLC | Wichita Falls, TX 76308 | Oil Operator | Apr 2025 |
| 1173 | Arch Petroleum Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2008 |
| 1174 | Archer Drilling & Prod. Co. | Archer City, TX 76351 | Oil & Gas Operator | Nov 2002 |
| 1175 | Archer Operations California LLC | | Gas Operator | Dec 2024 |
| 1176 | Archer Petroleum | Frisco, TX 75034 | Oil & Gas Operator | Aug 2021 |
| 1177 | Archer Reef Oil Co. | Bellevue, TX 76228 | Oil & Gas Operator | Apr 2025 |
| 1178 | Archer, Carl M. | Spearman, TX 79081 | Oil & Gas Operator | Feb 2005 |
| 1179 | Archer, Carl M. Farms, Inc. | Gruver, TX 79040 | Gas Operator | Mar 2024 |
| 1180 | Archer,Carl M Estate Partnership | Gruver, TX 79040 | Oil & Gas Operator | Sep 2022 |
| 1181 | Archibald Oil & Gas Operating Inc | Ada, OK 74820 | Oil & Gas Operator | Feb 2025 |
| 1182 | Archon Resources LLC | Houston, TX 77074 | Oil & Gas Operator | Jan 2015 |
| 1183 | Arco Alaska Inc. | | Oil & Gas Operator | Dec 2000 |
| 1184 | Arco O & G Co-Div Atl Rich Co | | Oil & Gas Operator | Feb 1994 |
| 1185 | Arco Oil & Gas C | | Oil & Gas Operator | Dec 1992 |
| 1186 | Arco Oil & Gas Co., Div. Of Atlantic Richfield | | Oil & Gas Operator | Jul 1992 |
| 1187 | Arco Oil & Gas Co.-Silsbee | Lafayette, LA 70505 | Oil & Gas Operator | Jul 1993 |
| 1188 | Arco Oil & Gas Company | Plano, TX 75086 | Oil & Gas Operator | Mar 2006 |
| 1189 | Arco Permian | Houston, TX 77079 | Oil & Gas Operator | Dec 2001 |
| 1190 | Arco Permian, A Div Of Atlantic Richfield Company | | Gas Operator | Dec 2001 |
| 1191 | Arco Pipe Line Company | Independence, KS 67301 | Oil & Gas Operator | Jun 1996 |
| 1192 | Arco Western Energy Co. | | Oil & Gas Operator | Dec 1999 |
| 1193 | Arcooil Corp | San Antonio, TX 78205 | Oil & Gas Operator | Apr 2025 |
| 1194 | Arcotex Oil & Gas Inc | Gainesville, TX 76241-1357 | Oil & Gas Operator | Feb 2025 |
| 1195 | Arcturus Oil Cor | | Oil Operator | Oct 1989 |
| 1196 | Arcturus Operating Company | Addison, TX 75001 | Oil & Gas Operator | Apr 2025 |
| 1197 | Ard Drilling Company Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jun 2000 |
| 1198 | Ard, Julian | Fort Worth, TX 76102 | Oil & Gas Operator | Jun 2002 |
| 1199 | Ardale Natural Gas LLC | Ford City, PA 16226-7003 | Gas Operator | Dec 2023 |
| 1200 | Ardc Inc. | Hays, KS 67601 | Oil Operator | Dec 2024 |