| 1001 | Cortam, Inc. | Augusta, KS 67010 | Oil Operator | Dec 2024 |
| 1002 | Corwin, B. V. | Enid, OK 73701 | Oil & Gas Operator | Apr 2017 |
| 1003 | Costilla Petroleum Corporation | Midland, TX 79702 | Oil & Gas Operator | Mar 2015 |
| 1004 | Cottonwood Oil C | | Oil & Gas Operator | Oct 1988 |
| 1005 | Cougar Energies, Inc. | Oberlin, KS 67749 | Oil Operator | Jun 1996 |
| 1006 | Cowboy Oil & Gas | Bristow, OK 74010-0057 | Oil & Gas Operator | Jul 2018 |
| 1007 | Cowley Energy Associates, LLC | Plano, TX 75093 | Gas Operator | Dec 2009 |
| 1008 | Cox Edwin L & Be | | Oil & Gas Operator | Nov 1989 |
| 1009 | Cox, Wayne D. | Eureka, KS 67045 | Oil Operator | Sep 1991 |
| 1010 | Craig Oil Compan | | Oil Operator | Jul 1996 |
| 1011 | Craig Oil Company | | Oil Operator | Dec 2019 |
| 1012 | Craig-Stephfield | | Oil & Gas Operator | Jan 1994 |
| 1013 | Craig/Stephfield Oil & Gas, Inc. | Ponca City, OK 74602 | Oil & Gas Operator | Apr 2001 |
| 1014 | Crane Edward | | Oil Operator | Feb 1995 |
| 1015 | Crater, Gary D. | Kansas City, MO 64108 | Oil & Gas Operator | Feb 1988 |
| 1016 | Crawford Oil & W | | Oil Operator | Dec 1985 |
| 1017 | Crawford Oil Com | | Oil Operator | Dec 1987 |
| 1018 | Crawford Oil LLC | Paola, KS 66071 | Oil Operator | Dec 2019 |
| 1019 | Crawford Production Company Inc | Junction City, AR 71749 | Oil & Gas Operator | Mar 2025 |
| 1020 | Crazy Horse Oil | | Oil Operator | Jan 2025 |
| 1021 | Creco Operating, LLC | | Oil & Gas Operator | Nov 2015 |
| 1022 | Crescent Drillin | | Gas Operator | Apr 1991 |
| 1023 | Crescent Oil & Gas | Decatur, TX 76234 | Gas Operator | Dec 1999 |
| 1024 | Crest Petr Inc | Rose Hill, KS 67133 | Oil Operator | Jun 2000 |
| 1025 | Crest Petroleum | Newark, OH 43055 | Oil & Gas Operator | Nov 1993 |
| 1026 | Criger Oil Compa | | Oil Operator | Sep 1992 |
| 1027 | Crimson Resources, LLC | Tulsa, OK 74133 | Oil Operator | Jul 2007 |
| 1028 | Cris Oil | | Oil Operator | Dec 2024 |
| 1029 | Criteria Petrole | | Oil Operator | Sep 1996 |
| 1030 | Crockett Oil And Gas, Inc. | Sharon, KS 67138 | Oil & Gas Operator | Jun 2006 |
| 1031 | Cross And Cross | Overland Park, KS 66214 | Oil Operator | Sep 1997 |
| 1032 | Cross Bar Energy, LLC | Wichita, KS 67206 | Oil Operator | Mar 2025 |
| 1033 | Cross Bar Petrol | | Oil Operator | Aug 1995 |
| 1034 | Cross Bar Petroleum, Inc. | Wichita, KS 67205 | Oil & Gas Operator | Jun 2016 |
| 1035 | Cross Timbers Op | | Oil & Gas Operator | Nov 1996 |
| 1036 | Cross Timbers Operating Co | Fort Worth, TX 76102 | Oil & Gas Operator | Mar 2025 |
| 1037 | Crossfield Larry | | Oil & Gas Operator | Sep 1993 |
| 1038 | Crowe Drilling C | | Oil & Gas Operator | May 1995 |
| 1039 | Crown Consulting, Inc. | Liberal, KS 67905 | Oil & Gas Operator | Mar 2025 |
| 1040 | Crown Energy Company | Oklahoma City, OK 73106 | Oil & Gas Operator | Apr 2025 |
| 1041 | Crown Well Service Inc | Capon Bridge, WV 26711 | Oil Operator | Mar 2025 |
| 1042 | Crude Kin Oil Company, Inc. | Louisburg, KS 66053 | Oil Operator | Mar 2025 |
| 1043 | Crude Producers | | Oil & Gas Operator | Sep 1988 |
| 1044 | CTR 247 LLC | Peru, KS 67360 | Oil Operator | Mar 2025 |
| 1045 | Cudd Operating Corp. | Oklahoma City, OK 73118 | Oil & Gas Operator | Apr 2020 |
| 1046 | Culbreath Oil & Gas Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Apr 2025 |
| 1047 | Cullen Corporati | | Oil & Gas Operator | Jan 1993 |
| 1048 | Cullison, Jimmie I. | Moscow, KS 67952 | Oil Operator | Apr 2002 |
| 1049 | Culver & Grounds | | Oil & Gas Operator | Nov 1995 |
| 1050 | Culver & Grounds Oil Properties, Inc. | McPherson, KS 67460 | Oil Operator | Mar 2025 |
| 1051 | Cunningham Crude, A General Partnership | Independence, KS 67301 | Oil Operator | Mar 2025 |
| 1052 | Cunningham, Melvin | Medicine Lodge, KS 67104 | Oil Operator | Jan 2013 |
| 1053 | Curry Oil | | Oil Operator | May 2005 |
| 1054 | Curry, Gregg | Madison, KS 66860 | Oil Operator | Mar 2025 |
| 1055 | Curt'S Oil Opera | | Oil Operator | Nov 1994 |
| 1056 | Curt'S Oil Operation, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Mar 2025 |
| 1057 | Custom Oil Explo | | Oil & Gas Operator | May 1992 |
| 1058 | Custom Service LLC | St John, KS 67576 | Oil Operator | Feb 2025 |
| 1059 | Cutler Oil, LLC | Rantoul, KS 66079 | Oil Operator | Nov 2024 |
| 1060 | CWB Oil Company, LLC | St. Francis, KS 67756 | Oil Operator | Mar 2025 |
| 1061 | Cycle Oil & Gas LTD | | Gas Operator | Dec 2024 |
| 1062 | Cyclone Petroleu | | Oil & Gas Operator | Nov 1995 |
| 1063 | Cyclone Petroleum, Incorporated | Jenks, OK 74037 | Oil & Gas Operator | Mar 2025 |
| 1064 | D & A Oil Company | Abilene, TX 79606 | Oil & Gas Operator | Oct 2018 |
| 1065 | D & A Oil Company, A General Partnership | Clearwater, KS 67026 | Oil Operator | Dec 2024 |
| 1066 | D & B Gas Co. | Burden, KS 67019 | Gas Operator | Feb 2001 |
| 1067 | D & D Energy | | Oil Operator | Jul 2023 |
| 1068 | D & F Petroleum | | Oil & Gas Operator | Sep 1990 |
| 1069 | D & G Oil Compan | | Oil Operator | Mar 1988 |
| 1070 | D & J Investment | | Oil Operator | Jun 1995 |
| 1071 | D & J Investments | Luling, TX 78648 | Oil Operator | Dec 2009 |
| 1072 | D & J Oil Company | Kermit, TX 79745 | Oil & Gas Operator | Jul 2025 |
| 1073 | D & L Energy | Morland, KS 67650 | Oil Operator | Mar 1995 |
| 1074 | D & M Oil, Inc. | Winfield, KS 67156 | Oil Operator | Apr 2001 |
| 1075 | D & R Oil Properties | | Oil Operator | May 1998 |
| 1076 | D & R Oil, Inc. | Galva, KS 67443 | Oil & Gas Operator | Jul 2024 |
| 1077 | D & R Well Service, Inc. | Galva, KS 67443 | Oil & Gas Operator | Feb 2025 |
| 1078 | D & T Oil Company | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 1079 | D & W Oil Compan | | Oil Operator | Jan 1987 |
| 1080 | D & Z Exploration, Inc. | St Elmo, IL 62458 | Oil Operator | Mar 2025 |
| 1081 | D And B Oil | Midland, TX 79702 | Oil & Gas Operator | Jul 2025 |
| 1082 | D J Oil Operations | | Oil Operator | Dec 2009 |
| 1083 | D K Oil Services LLC | Wellsville, KS 66092 | Oil Operator | Nov 2019 |
| 1084 | D Oil, Inc. | Victoria, KS 67671 | Oil Operator | Mar 2025 |
| 1085 | D S & W Well Ser | | Oil Operator | Nov 1996 |
| 1086 | D S & W Well Servicing, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 1087 | D U Investments | Salina, KS 67401 | Oil & Gas Operator | Dec 2009 |
| 1088 | D-Oil Incorporat | | Oil Operator | Aug 1990 |
| 1089 | D. E. Exploration, Inc. | Wellsville, KS 66092 | Oil & Gas Operator | Mar 2025 |
| 1090 | D. Jackson Rentals LLC | Easton, KS 66020 | Oil Operator | Mar 2025 |
| 1091 | D. R. Lauck Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jul 2019 |
| 1092 | D.K. Rush Oil Co., LLC | El Dorado, KS 67042 | Oil Operator | Mar 2025 |
| 1093 | D.M. Well Service | | Oil Operator | Dec 2019 |
| 1094 | D.W.S. Properties | Sterling, KS 67579 | Oil Operator | Mar 2006 |
| 1095 | Da Co Petroleum, Inc. | Wann, OK 74083 | Gas Operator | Apr 2003 |
| 1096 | Da Energy, LLC | Lees Summit, MO 64063 | Oil Operator | Feb 2025 |
| 1097 | Dakota Drilling, LLC | Wichita, KS 67205 | Oil Operator | Feb 2006 |
| 1098 | Dakota Production Co., Inc. | Neodesha, KS 66757 | Gas Operator | Mar 2025 |
| 1099 | Dakota Resources | | Oil & Gas Operator | Jan 1989 |
| 1100 | Dale E. Jackson Production Co. | | Oil Operator | Mar 2025 |