| 1101 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 1102 | Chanse Petroleum Corporation | New York, NY 10165-1134 | Oil & Gas Operator | Feb 2015 |
| 1103 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 1104 | Chapel Operating LLC | Lone Grove, OK 73443 | Oil Operator | Oct 2025 |
| 1105 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 1106 | Chapman Energy Oklahoma Inc | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 1107 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 1108 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 1109 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Nov 2025 |
| 1110 | Chapman Resources Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 1999 |
| 1111 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 1112 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 1113 | Charter Services LLC | Cushing, OK 74023 | Oil Operator | Nov 2025 |
| 1114 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 1115 | Chastain Land & Energy LLC | Wetumka, OK 74883-0067 | Oil & Gas Operator | Sep 2017 |
| 1116 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 1117 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 1118 | Chatham VIckie R | Wilson, OK 73463 | Oil Operator | Oct 2025 |
| 1119 | Chatham, Maxine | | Oil Operator | Oct 2016 |
| 1120 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 1121 | Chenhall Billy J | Haskell, OK 74436-8733 | Oil & Gas Operator | Sep 2015 |
| 1122 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Oct 2025 |
| 1123 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 1124 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1125 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Sep 2025 |
| 1126 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 1127 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 1128 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2025 |
| 1129 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 1130 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Oct 2025 |
| 1131 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 1132 | Chew-Coast & Sons | Bartlesville, OK 74006-0407 | Gas Operator | Dec 2012 |
| 1133 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 1134 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 1135 | Chief Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 1995 |
| 1136 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Nov 2025 |
| 1137 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 1138 | Chiles Robert Morris | Allen, OK 74825 | Oil Operator | Oct 2025 |
| 1139 | Chinn, Larry A | | Oil & Gas Operator | Oct 2025 |
| 1140 | Chinn, Larry E | | Oil & Gas Operator | Oct 2025 |
| 1141 | Chinn, Velma D | | Oil Operator | Mar 2015 |
| 1142 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Nov 2025 |
| 1143 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 1144 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 1145 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 1146 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 1147 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Nov 2025 |
| 1148 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Nov 2025 |
| 1149 | Chockley Energy LLC | Beaver, OK 73932 | Gas Operator | Oct 2025 |
| 1150 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Oct 2025 |
| 1151 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 1152 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Sep 2025 |
| 1153 | Chris Oil Co | Cambridge, OH 43725 | Oil & Gas Operator | Nov 2008 |
| 1154 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 1155 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 1156 | Christian Bros Op Co Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 1157 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 1158 | Cibola Energy Corp | Albuquerque, NM 87103 | Oil & Gas Operator | Oct 2017 |
| 1159 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 1160 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 1161 | Cigna Energy Resources Inc | Englewood, CO 80155-5038 | Oil Operator | Nov 1998 |
| 1162 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Dec 2025 |
| 1163 | Cimarron Management Corp | | Oil & Gas Operator | Jul 2020 |
| 1164 | Cimarron Oil & Gas Inc | Perry, OK 73077-1318 | Oil & Gas Operator | Sep 2000 |
| 1165 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 1166 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Oct 2025 |
| 1167 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Oct 2025 |
| 1168 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Oct 2025 |
| 1169 | Cimarron Valley Energy Inc | Stillwater, OK 74076 | Oil Operator | Apr 2015 |
| 1170 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Nov 2025 |
| 1171 | Circle C Oilfield Supply Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2017 |
| 1172 | Circle K Oil & Gas Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Oct 2025 |
| 1173 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Oct 2025 |
| 1174 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Nov 2025 |
| 1175 | Citadel Prod Company Inc | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 1176 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 1177 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Dec 2025 |
| 1178 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 1179 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 1180 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 1181 | Citizen Energy Ventures LLC | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 1182 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 1183 | Civic Energy Corporation | Colony, OK 73021 | Oil & Gas Operator | Nov 2025 |
| 1184 | CJR Operating LLC | Wister, OK 74966 | Gas Operator | Oct 2025 |
| 1185 | CK Resources | Cleveland, OK 74020-0772 | Oil Operator | Aug 2013 |
| 1186 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | Sep 2025 |
| 1187 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 1188 | Claiborne-McDonald Inc | Chickasha, OK 73018 | Oil Operator | Jul 2007 |
| 1189 | Clapp Carl O | Cedar Vale, KS 67024 | Oil Operator | Aug 2013 |
| 1190 | Claremont Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2017 |
| 1191 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 1192 | Clarita Operating LLC | Ada, OK 74821 | Oil Operator | Jun 2022 |
| 1193 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 1194 | Clark Exploration Company | Highlands Ranch, CO 80126-7645 | Oil & Gas Operator | Nov 2024 |
| 1195 | Clark Krista | Ada, OK 74820-8595 | Oil Operator | Sep 2001 |
| 1196 | Clark Operating Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 1197 | Clark Operating Services Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 1198 | Clark Well Service | Depew, OK 74028-0296 | Oil & Gas Operator | Aug 2013 |
| 1199 | Class Petroleum Corporation | Barnsdall, OK 74002 | Oil Operator | Aug 2013 |
| 1200 | Clay A Muegge | | Oil & Gas Operator | Nov 2025 |