| 1101 | Chief Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 1995 |
| 1102 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | May 2025 |
| 1103 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 1104 | Chiles Robert Morris | Allen, OK 74825 | Oil Operator | Apr 2025 |
| 1105 | Chinn, Larry A | | Oil & Gas Operator | Apr 2025 |
| 1106 | Chinn, Larry E | | Oil & Gas Operator | Apr 2025 |
| 1107 | Chinn, Velma D | | Oil Operator | Mar 2015 |
| 1108 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | May 2025 |
| 1109 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 1110 | Chisholm Trail Resources, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 1111 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 1112 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 1113 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Apr 2025 |
| 1114 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | May 2025 |
| 1115 | Chockley Energy LLC | Beaver, OK 73932 | Gas Operator | Apr 2025 |
| 1116 | Choctaw Gas Company | Quinton, OK 74561 | Gas Operator | Apr 2025 |
| 1117 | Cholla Petroleum Inc | Dallas, TX 75225 | Oil & Gas Operator | Jul 2025 |
| 1118 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Mar 2025 |
| 1119 | Chris Oil Co | Cambridge, OH 43725 | Oil & Gas Operator | Nov 2008 |
| 1120 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 1121 | Christeve Oil Company, Inc. | Houston, TX 77068 | Oil & Gas Operator | Dec 2022 |
| 1122 | Christian Bros Op Co Inc | Ada, OK 74820 | Oil & Gas Operator | Apr 2014 |
| 1123 | Christie Jr C B | Wichita Falls, TX 76308-4873 | Oil & Gas Operator | May 2024 |
| 1124 | Cibola Energy Corporation | Albuquerque, NM 87103 | Oil & Gas Operator | Oct 2017 |
| 1125 | Cig Exploration Inc | Houston, TX 77046 | Oil & Gas Operator | Nov 1999 |
| 1126 | Cig Resources Company | Colorado Spring, CO 80944-1087 | Oil & Gas Operator | Jun 2018 |
| 1127 | Cigna Energy Resources Inc | Englewood, CO 80155-5038 | Oil Operator | Nov 1998 |
| 1128 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 1129 | Cimarex Energy Co. Of Colorado | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 1130 | Cimarron Management Corp | | Oil & Gas Operator | Jul 2020 |
| 1131 | Cimarron Oil & Gas Inc | Perry, OK 73077-1318 | Oil & Gas Operator | Sep 2000 |
| 1132 | Cimarron Operating Company | Oklahoma City, OK 73112-3967 | Oil & Gas Operator | May 2011 |
| 1133 | Cimarron Petroleum Corporation | Houston, TX 77057-2696 | Oil & Gas Operator | Apr 2025 |
| 1134 | Cimarron Production Co Inc | Oklahoma City, OK 73142-3017 | Oil & Gas Operator | Apr 2025 |
| 1135 | Cimarron River Operating Co | Mannford, OK 74044 | Oil & Gas Operator | Apr 2025 |
| 1136 | Cimarron Valley Energy Inc | Stillwater, OK 74076 | Oil Operator | Apr 2015 |
| 1137 | Circle 9 Resources LLC | Oklahoma City, OK 73104 | Oil & Gas Operator | Apr 2025 |
| 1138 | Circle C Oilfield Supply Inc | Wetumka, OK 74883-0068 | Oil & Gas Operator | Apr 2017 |
| 1139 | Circle K Oil & Gas Inc | Sand Springs, OK 74063 | Oil & Gas Operator | Apr 2025 |
| 1140 | Cirrus Production Company | Enid, OK 73702 | Oil & Gas Operator | Apr 2025 |
| 1141 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Mar 2025 |
| 1142 | Citadel Production Company, Inc. | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 1143 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 1144 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Jul 2025 |
| 1145 | Cities Services Company | | Oil & Gas Operator | Mar 2008 |
| 1146 | Citizen Energy II LLC | Tulsa, OK 74103-3729 | Oil & Gas Operator | Apr 2025 |
| 1147 | Citizen Energy III LLC | Devner, CO 80202 | Oil & Gas Operator | Apr 2025 |
| 1148 | Citrus Energy Corporation | Castle Rock, CO 80104 | Oil & Gas Operator | Mar 2020 |
| 1149 | Civic Energy Corporation | Colony, OK 73021 | Oil & Gas Operator | Apr 2025 |
| 1150 | CJR Operating LLC | Wister, OK 74966 | Gas Operator | Apr 2025 |
| 1151 | CK Resources | Cleveland, OK 74020-0772 | Oil Operator | Aug 2013 |
| 1152 | Claassen Oil And Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Mar 2025 |
| 1153 | Claborn Julia | Okmulgee, OK 74447-9781 | Oil & Gas Operator | Mar 2022 |
| 1154 | Claiborne-McDonald Inc | Chickasha, OK 73018 | Oil Operator | Jul 2007 |
| 1155 | Clapp Carl O | Cedar Vale, KS 67024 | Oil Operator | Aug 2013 |
| 1156 | Claremont Corporation | Tulsa, OK 74119 | Oil & Gas Operator | Feb 2017 |
| 1157 | Claremont Exploration Inc | Tulsa, OK 74103-4107 | Oil & Gas Operator | Jun 1997 |
| 1158 | Clarita Operating LLC | Ada, OK 74821 | Oil Operator | Jun 2022 |
| 1159 | Clark And Clark | Princeton, NJ 08540-1930 | Oil & Gas Operator | Jul 2013 |
| 1160 | Clark Exploration Co. | Highlands Ranch, CO 80126-7645 | Oil & Gas Operator | Nov 2024 |
| 1161 | Clark Krista | Ada, OK 74820-8595 | Oil Operator | Sep 2001 |
| 1162 | Clark Operating Inc. | Wichita Falls, TX 76308 | Oil & Gas Operator | Jul 2025 |
| 1163 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 1164 | Clark Well Service | Depew, OK 74028-0296 | Oil & Gas Operator | Aug 2013 |
| 1165 | Class Petroleum Corporation | Barnsdall, OK 74002 | Oil Operator | Aug 2013 |
| 1166 | Clay Investments LLC | Stillwater, OK 74075-3600 | Oil & Gas Operator | Jan 2021 |
| 1167 | Claybrook Drilling Co Inc | | Oil & Gas Operator | Sep 2014 |
| 1168 | Claybrook Production Co. Inc. | Wewoka, OK 74884-1380 | Oil & Gas Operator | Jun 2014 |
| 1169 | Clayton Corp Petro & Natural Gas Prod | Lakewood, CO 80228-1836 | Oil & Gas Operator | Oct 2020 |
| 1170 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 1171 | CLC Operations Inc | Midland, TX 79701 | Oil & Gas Operator | Mar 1997 |
| 1172 | Clean Oil LLC | Ada, OK 74820 | Oil & Gas Operator | Mar 2025 |
| 1173 | Clear Creek Royalty LLC | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2023 |
| 1174 | Cleary Exploration LLC | Oklahoma City, OK 73112-7221 | Oil & Gas Operator | Oct 2014 |
| 1175 | Cleary Jo Anne | Saint Louis, OK 74866 | Oil Operator | Mar 2025 |
| 1176 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 1177 | Cleere Operating LLC | Shawnee, OK 74804-2610 | Oil Operator | Apr 2025 |
| 1178 | Clements Exploration Co | Oklahoma City, OK 73132-5922 | Oil & Gas Operator | Jan 2006 |
| 1179 | Clemishire Don | Hominy, OK 74035 | Oil & Gas Operator | May 2025 |
| 1180 | Clemishire, Brian S | | Oil & Gas Operator | Nov 2014 |
| 1181 | Clemishire, Jerry L | | Oil & Gas Operator | Apr 2025 |
| 1182 | Clemishire, Mark E | | Oil Operator | Apr 2025 |
| 1183 | Clemshire Bob | Hominy, OK 74035 | Oil & Gas Operator | Apr 2025 |
| 1184 | Clemshire Drilling Company | Tulsa, OK 74105 | Oil Operator | Apr 2025 |
| 1185 | Cleveland Rod & Tracy | Elmore City, OK 73433-9467 | Oil & Gas Operator | Jul 2023 |
| 1186 | Click Betty | Stigler, OK 74462-0081 | Oil & Gas Operator | Feb 2016 |
| 1187 | Click Robert R | Dallas, TX 75231 | Oil & Gas Operator | Nov 1995 |
| 1188 | Clifford Resources Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Jul 2015 |
| 1189 | Cliffwood Production Co. | Houston, TX 77090 | Oil & Gas Operator | Aug 2013 |
| 1190 | Clift Cary E | Chickasha, OK 73018-6305 | Oil & Gas Operator | Sep 2024 |
| 1191 | Clifton & Associates Inc | Tulsa, OK 74133 | Oil & Gas Operator | May 2020 |
| 1192 | Clifton Consulting Inc | Piedmont, OK 73078-0180 | Gas Operator | Apr 2025 |
| 1193 | Climax Oil Co LLC | Comanche, OK 73529-7715 | Oil Operator | Apr 2025 |
| 1194 | Clindco Inc | Bartlesville, OK 74006-6213 | Oil & Gas Operator | Oct 2019 |
| 1195 | Clinton Public Works Authority | Clinton, OK 73601 | Oil & Gas Operator | May 2023 |
| 1196 | CLM Oil Production Inc | Bartlesville, OK 74006-4417 | Oil & Gas Operator | May 2025 |
| 1197 | Cloer VIrgil R | Oklahoma City, OK 73121 | Oil & Gas Operator | Apr 1993 |
| 1198 | CLV Oil & Gas Inc | Tulsa, OK 74169-0713 | Oil & Gas Operator | Apr 2020 |
| 1199 | Clydesdale Energy LLC | Oklahoma City, OK 73116-9111 | Oil & Gas Operator | Nov 2019 |
| 1200 | CM Exploration Company Inc. | | Oil & Gas Operator | Apr 2009 |