| 1001 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Jan 2026 |
| 1002 | Castle Exploration Company Inc | Blue Bell, PA 19422 | Oil & Gas Operator | May 2018 |
| 1003 | Castle Operating LLC | Oklahoma City, OK 73114-7444 | Oil & Gas Operator | Jan 2026 |
| 1004 | Castlerock Resources Inc | Oklahoma City, OK 73116-3710 | Oil & Gas Operator | Jul 2020 |
| 1005 | Cates Betty J | Tulsa, OK 74112 | Oil & Gas Operator | Nov 2016 |
| 1006 | Cathey Production Company | Ryan, OK 73565-0485 | Oil Operator | Dec 2010 |
| 1007 | Caulkins Oil Company | Aztec, NM 87410 | Oil & Gas Operator | Oct 2024 |
| 1008 | Cayman Exploration Corp | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 1009 | Cayman Resources Corporation | Tulsa, OK 74119-1323 | Oil & Gas Operator | Jun 2001 |
| 1010 | CB Oil Company | Drumright, OK 74030 | Oil & Gas Operator | Jan 2026 |
| 1011 | CBL Resources LLC | Tulsa, OK 74136-6308 | Oil & Gas Operator | Jan 2026 |
| 1012 | CBM Gas Company LLC | Dewey, OK 74029 | Oil & Gas Operator | Aug 2020 |
| 1013 | Cbo Oil And Gas, LLC | Stillwater, OK 74075-8793 | Oil & Gas Operator | Jan 2026 |
| 1014 | CBS Energy LLC | Oklahoma City, OK 73142-4437 | Oil & Gas Operator | Feb 2026 |
| 1015 | CCS Investments Inc | Bartlesville, OK 74006-1941 | Oil Operator | Feb 2026 |
| 1016 | CDG Inc | Sapulpa, OK 74066-6339 | Oil Operator | Oct 2020 |
| 1017 | CDS Oil Company | Tulsa, OK 74147-1514 | Oil & Gas Operator | Mar 2015 |
| 1018 | Cedar Oil Company | Midland, TX 79707 | Oil & Gas Operator | May 2026 |
| 1019 | Cei Operating LLC | Katy, TX 77449 | Oil & Gas Operator | May 2026 |
| 1020 | Cei Petroleum Inc | Tulsa, OK 74103-4141 | Oil & Gas Operator | Jul 2016 |
| 1021 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Feb 2026 |
| 1022 | Celero Energy LP | Midland, TX 79701 | Oil & Gas Operator | May 2011 |
| 1023 | Cement Oil Company | Cement, OK 73017-9234 | Oil & Gas Operator | Dec 2025 |
| 1024 | Cemoil Inc | Chickasha, OK 73018 | Oil & Gas Operator | Jan 2026 |
| 1025 | Cenergy Exploration Company | Dallas, TX 75231 | Oil & Gas Operator | Sep 2000 |
| 1026 | Cenpat Operating LLC | Houston, TX 77042-3044 | Oil & Gas Operator | Jan 2026 |
| 1027 | Centaur Resources Inc | Oklahoma City, OK 73142-6804 | Oil & Gas Operator | Feb 2026 |
| 1028 | Centennial Resources Inc | Drumright, OK 74030-1234 | Oil & Gas Operator | Dec 2007 |
| 1029 | Center Oil Company | Ada, OK 74821-0584 | Oil Operator | May 2003 |
| 1030 | Center Production Company LLC | Ada, OK 74820 | Oil Operator | Feb 2026 |
| 1031 | Central California Oil Company | Fish Camp, CA 93623 | Oil & Gas Operator | Mar 2026 |
| 1032 | Central Oklahoma Disposal Company | Kingston, OK 73439 | Oil Operator | Jan 2026 |
| 1033 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 1034 | Central Transmission Systems Co | | Oil & Gas Operator | Apr 2015 |
| 1035 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jan 2026 |
| 1036 | Centurion Oil Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | May 1992 |
| 1037 | Centurion Oilfield Services LLC | Burneyville, OK 73430 | Oil & Gas Operator | Jan 2026 |
| 1038 | Centurion Resources LLC | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 1039 | Century Petroleum | Nowata, OK 74048 | Oil & Gas Operator | Dec 2000 |
| 1040 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Feb 2026 |
| 1041 | CFC Oil Inc | Cyril, OK 73029-5601 | Oil & Gas Operator | Dec 2025 |
| 1042 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 1043 | CH4 Energy II LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Feb 2026 |
| 1044 | CH4 Production Company Inc | Tulsa, OK 74170-1955 | Gas Operator | May 2007 |
| 1045 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Mar 2026 |
| 1046 | Challenge Operating Inc | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2024 |
| 1047 | Chambers & Hendrix Oil & Gas | Skiatook, OK 74070-0726 | Oil & Gas Operator | Aug 2022 |
| 1048 | Chambers Jerry Expl Co | | Oil & Gas Operator | Sep 2000 |
| 1049 | Champ Oil Company | Hickory Creek, TX 75065 | Oil & Gas Operator | Dec 2020 |
| 1050 | Champion Reserves-Cri Inc | Oklahoma City, OK 73123 | Oil & Gas Operator | Jun 1994 |
| 1051 | Champlin Exploration, Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2026 |
| 1052 | Chance Oil Co., Inc. | Vernon, TX 76385 | Oil & Gas Operator | Feb 2026 |
| 1053 | Chaney & Cogburn Roustabout Well Serv | Cement, OK 73017-0267 | Oil & Gas Operator | Mar 2015 |
| 1054 | Chanse Energy Corporation | Shreveport, LA 71165-1572 | Oil & Gas Operator | Sep 2021 |
| 1055 | Chanse Petroleum Corporation | New York, NY 10165-1134 | Oil & Gas Operator | Feb 2015 |
| 1056 | Chanze Oil Co., Inc. | Kilgore, TX 75663 | Oil & Gas Operator | May 2026 |
| 1057 | Chapel Operating LLC | Lone Grove, OK 73443 | Oil Operator | Jan 2026 |
| 1058 | Chapman Elise P Estate | | Oil & Gas Operator | Mar 2020 |
| 1059 | Chapman Energy Oklahoma Inc | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 1060 | Chapman Exploration Inc | Tulsa, OK 74136 | Oil & Gas Operator | Aug 2013 |
| 1061 | Chapman Jim | Bristow, OK 74010-1173 | Oil Operator | Apr 2021 |
| 1062 | Chapman Oil Company | Midland, TX 79702 | Oil & Gas Operator | Jan 2026 |
| 1063 | Chapman Resources Corporation | Dallas, TX 75231 | Oil & Gas Operator | May 1999 |
| 1064 | Charro Operating, L.L.C. | Englewood, CO 80112 | Oil & Gas Operator | May 2026 |
| 1065 | Charter Oak Production Co LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2026 |
| 1066 | Charter Services LLC | Cushing, OK 74023 | Oil Operator | Mar 2026 |
| 1067 | Chastain Diane | Coffeyville, KS 67337-9620 | Oil & Gas Operator | Feb 2015 |
| 1068 | Chastain Land & Energy LLC | Wetumka, OK 74883-0067 | Oil & Gas Operator | Sep 2017 |
| 1069 | Chatham John | Wilson, OK 73463-9575 | Oil Operator | Feb 2014 |
| 1070 | Chatham Verdell | Ratliff City, OK 73081-0061 | Oil Operator | Oct 2009 |
| 1071 | Chatham VIckie R | Wilson, OK 73463 | Oil Operator | Jan 2026 |
| 1072 | Chatham, Maxine | | Oil Operator | Oct 2016 |
| 1073 | Chen K Wendell | Arlington, TX 76016-2555 | Oil & Gas Operator | Mar 2015 |
| 1074 | Chenhall Billy J | Haskell, OK 74436-8733 | Oil & Gas Operator | Sep 2015 |
| 1075 | Cher Oil Company LTD | Ripley, OK 74062 | Oil & Gas Operator | Feb 2026 |
| 1076 | Chermac Energy Corporation | Edmond, OK 73083 | Oil & Gas Operator | Apr 2020 |
| 1077 | Cherokee Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1078 | Cherokee Royalties & Minerals Inc | Duncan, OK 73533 | Oil & Gas Operator | Nov 2025 |
| 1079 | Cherry, William H., Inc. | Oklahoma City, OK 73125 | Oil & Gas Operator | Mar 2015 |
| 1080 | Chesapeake Exploration LLC | Oklahoma City, OK 731540496 | Oil & Gas Operator | Jul 2020 |
| 1081 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2026 |
| 1082 | Chesapeake Permian LP | Oklahoma City, OK 73118-1044 | Oil & Gas Operator | Feb 2015 |
| 1083 | Chester Oil Company | Wetumka, OK 74883-6227 | Oil & Gas Operator | Feb 2026 |
| 1084 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | May 2026 |
| 1085 | Chew-Coast & Sons | Bartlesville, OK 74006-0407 | Gas Operator | Dec 2012 |
| 1086 | Cheyenne Petroleum Company | Oklahoma City, OK 73134 | Oil & Gas Operator | May 2026 |
| 1087 | Chica Oil Company | Lago VIsta, TX 78645-6561 | Oil & Gas Operator | Mar 2001 |
| 1088 | Chief Well Service Inc | Drumright, OK 74030 | Oil & Gas Operator | Mar 1995 |
| 1089 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Feb 2026 |
| 1090 | Chiles Jack Well Service | Atwood, OK 74827-0373 | Oil Operator | Apr 2014 |
| 1091 | Chiles Robert Morris | Allen, OK 74825 | Oil Operator | Dec 2025 |
| 1092 | Chinn, Larry A | | Oil & Gas Operator | Feb 2026 |
| 1093 | Chinn, Larry E | | Oil & Gas Operator | Feb 2026 |
| 1094 | Chinn, Velma D | | Oil Operator | Mar 2015 |
| 1095 | Chisholm Oil And Gas Operating LLC | Tulsa, OK 74103-3522 | Oil & Gas Operator | Feb 2026 |
| 1096 | Chisholm Operating LLC | Oklahoma City, OK 73101-1502 | Oil & Gas Operator | Dec 2017 |
| 1097 | Chisos Exploration Inc | Enid, OK 73703 | Oil & Gas Operator | Dec 2004 |
| 1098 | Chisum G H | Duncan, OK 73533 | Oil & Gas Operator | Dec 2010 |
| 1099 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2026 |
| 1100 | Choate Kenny Dba Rebound Oil Co | Helena, OK 73741-0543 | Gas Operator | Feb 2026 |