| 1001 | Carnes Crude Oil Reclaiming Industry | | Oil Operator | Dec 2019 |
| 1002 | Carnes Petroleum Corporation | Cleveland, OK 74020 | Oil & Gas Operator | May 2020 |
| 1003 | Carney A B | | Oil & Gas Operator | Jan 2014 |
| 1004 | Carney Mark C & Karen M | Dallas, TX 75206-4010 | Oil & Gas Operator | Oct 1994 |
| 1005 | Carpenter Luther | Skiatook, OK 74070-9124 | Oil & Gas Operator | Aug 2025 |
| 1006 | Carpenter R L | Sapulpa, OK 74067-0452 | Oil Operator | Mar 2007 |
| 1007 | Carr Exploration Corp. | Dallas, TX 75225 | Oil & Gas Operator | Aug 2003 |
| 1008 | Carrera Energy LLC | Midland, TX 79704-5036 | Oil & Gas Operator | Aug 2025 |
| 1009 | Carroll M R Dba Carroll Production Company | Sapulpa, OK 74066 | Oil & Gas Operator | Sep 2025 |
| 1010 | Carruth David C Family Trust | Russellville, AR 72811-2061 | Oil Operator | Aug 2002 |
| 1011 | Carter County Salt Water Disposal Inc | Wilson, OK 73463 | Oil Operator | Aug 2025 |
| 1012 | Carter Donald L | Sand Springs, OK 74063-8105 | Oil Operator | May 2006 |
| 1013 | Carter Preston Drilling Co | Davis, OK 73030 | Gas Operator | Nov 2000 |
| 1014 | Cartledge & Cartledge Oil Company Inc | Kiefer, OK 74041 | Oil & Gas Operator | Sep 2025 |
| 1015 | Cartledge Energy LLC | Sapulpa, OK 74066-6623 | Oil & Gas Operator | Aug 2025 |
| 1016 | Carver Harry | Oklahoma City, OK 73120 | Oil & Gas Operator | Nov 2000 |
| 1017 | Casa Grande Exploration Company | Casa Grande, AZ 85194 | Oil & Gas Operator | Aug 2025 |
| 1018 | Case Sales Company Inc | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Aug 2025 |
| 1019 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Aug 2025 |
| 1020 | Casey, Carl D | | Oil Operator | Sep 2024 |
| 1021 | Casillas Operating LLC | Tulsa, OK 74103-4060 | Oil & Gas Operator | Aug 2025 |
| 1022 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Sep 2025 |
| 1023 | Cason William J | Santee, CA 92071-2765 | Oil Operator | Sep 2019 |
| 1024 | Caspen Oil, Inc. | Denver, CO 80226 | Oil & Gas Operator | Jul 1993 |
| 1025 | Casselman Charles Jack | Okmulgee, OK 74447-4265 | Oil & Gas Operator | Apr 2020 |
| 1026 | Casselman Leases LLC | Morris, OK 74445-2509 | Oil & Gas Operator | Aug 2025 |
| 1027 | Casselman Ronald H | Morris, OK 74445 | Oil & Gas Operator | Aug 2025 |
| 1028 | Casselman-Sheely | Emporia, KS 66801 | Oil & Gas Operator | Oct 2021 |
| 1029 | Cassidy Jr John | Stroud, OK 74079-0200 | Oil & Gas Operator | Nov 2014 |
| 1030 | Castella Inc | Bartlesville, OK 74003-3712 | Oil & Gas Operator | Sep 2025 |
| 1031 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Aug 2025 |
| 1032 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 1033 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Aug 2025 |
| 1034 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 1035 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 1036 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 1037 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 1038 | Cayman Exploration Corp | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 1039 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 1040 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jul 2025 |
| 1041 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Sep 2025 |
| 1042 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 1043 | Cbo Oil And Gas, LLC | Stillwater, OK 74075-8793 | Oil Operator | Jul 2025 |
| 1044 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Aug 2025 |
| 1045 | CCS Investments Inc | Bartlesville, OK 74006-1941 | Oil Operator | Aug 2025 |
| 1046 | CDG Inc | Sapulpa, OK 74066-6339 | Oil Operator | Oct 2020 |
| 1047 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 1048 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | Dec 2025 |
| 1049 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | Dec 2025 |
| 1050 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 1051 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2025 |
| 1052 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 1053 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | Aug 2025 |
| 1054 | Cemoil Inc | Cement, OK 73017-0563 | Oil & Gas Operator | Aug 2025 |
| 1055 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 1056 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Aug 2025 |
| 1057 | Centaur Resources Inc | Oklahoma City, OK 73142-6804 | Oil & Gas Operator | Aug 2025 |
| 1058 | Centennial Resources Inc | Drumright, OK 74030-1234 | Oil & Gas Operator | Dec 2007 |
| 1059 | Center Oil Company | Ada, OK 74821-0584 | Oil Operator | May 2003 |
| 1060 | Center Production Company LLC | Ada, OK 74820 | Oil Operator | Aug 2025 |
| 1061 | Central California Oil Company | Fish Camp, CA 93623 | Oil & Gas Operator | Oct 2025 |
| 1062 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 1063 | Central Transmission Systems Co | | Oil & Gas Operator | Apr 2015 |
| 1064 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2025 |
| 1065 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 1066 | Centurion Oilfield Services LLC | Burneyville, OK 73430 | Oil Operator | Aug 2025 |
| 1067 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 1068 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 1069 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2025 |
| 1070 | Cewell Energy LLC | Houston, TX 77042 | Oil & Gas Operator | Jul 2024 |
| 1071 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | Aug 2025 |
| 1072 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 1073 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Sep 2025 |
| 1074 | CH4 Production Company Inc | Tulsa, OK 74170-1955 | Gas Operator | May 2007 |
| 1075 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 1076 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 1077 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 1078 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 1079 | Champ Oil Company | Hickory Creek, TX 75065 | Oil & Gas Operator | Dec 2020 |
| 1080 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 1081 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Sep 2025 |
| 1082 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Aug 2025 |
| 1083 | Chaney & Cogburn Roustabout Well Serv | Cement, OK 73017-0267 | Oil & Gas Operator | Mar 2015 |
| 1084 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 1085 | Chanse Petroleum Corporation | New York, NY 10165-1134 | Oil & Gas Operator | Feb 2015 |
| 1086 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Dec 2025 |
| 1087 | Chapel Operating LLC | Lone Grove, OK 73443 | Oil Operator | Aug 2025 |
| 1088 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 1089 | Chapman Energy Oklahoma Inc | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 1090 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 1091 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 1092 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Aug 2025 |
| 1093 | Chapman Resources Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 1999 |
| 1094 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | Dec 2025 |
| 1095 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Dec 2025 |
| 1096 | Charter Services LLC | Cushing, OK 74023 | Oil Operator | Sep 2025 |
| 1097 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 1098 | Chastain Land & Energy LLC | Wetumka, OK 74883-0067 | Oil & Gas Operator | Sep 2017 |
| 1099 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 1100 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |