| 901 | Clinton, Orville L., Jr. | Paola, KS 66071 | Oil Operator | Apr 2005 |
| 902 | Clothier, David W. | Eastborough, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 903 | Clover Oil Company | | Oil Operator | Jan 2025 |
| 904 | Clubine, Jim L. | Independence, KS 67301 | Oil Operator | Nov 2024 |
| 905 | Clute Oil Corporation | Cherry Hills VIllage, CO 80113 | Oil & Gas Operator | Jan 2025 |
| 906 | Clyde Petroleum | | Oil & Gas Operator | Dec 1988 |
| 907 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | May 2025 |
| 908 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jan 2025 |
| 909 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 910 | Co-Co Incorporat | | Oil Operator | Oct 1989 |
| 911 | Coachman Energy Operating Company LLC | Englewood, CO 80111 | Oil & Gas Operator | May 2024 |
| 912 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 913 | Coastal Oil & Ga | | Oil & Gas Operator | Oct 1996 |
| 914 | Coastal Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 915 | Coastal Oil & Gas Corporation | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 916 | Coats Energy, Inc. | Wichita, KS 67201 | Oil & Gas Operator | Jan 2025 |
| 917 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Jan 2025 |
| 918 | Cobra Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 919 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | May 2025 |
| 920 | Coda Energy, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 1998 |
| 921 | Cody & Krysti Hunsperger | Osawatomie, KS 66064 | Oil Operator | Mar 2024 |
| 922 | Cody Resources, Inc. | Midland, TX 79705 | Oil & Gas Operator | Sep 2002 |
| 923 | Cody, Ken L. | Longton, KS 67352 | Oil & Gas Operator | Dec 2024 |
| 924 | Cody, Nancy M. | Fredonia, KS 66736 | Oil Operator | Jun 1998 |
| 925 | Coen Energy | | Oil Operator | Mar 1995 |
| 926 | Coen Energy Corporation | Overland Park, KS 66221 | Oil Operator | Jan 2025 |
| 927 | Cokan Resources | Colby, KS 67701 | Oil Operator | Aug 1994 |
| 928 | Col-Kan Developm | | Oil & Gas Operator | Jan 1995 |
| 929 | Col-Kan Development, Inc. | Russell, KS 67665 | Oil Operator | Jul 2005 |
| 930 | Collier Oil Prop | | Oil Operator | Apr 1987 |
| 931 | Collins John B | | Oil Operator | Sep 1994 |
| 932 | Collins Oil Comp | | Oil Operator | Apr 1995 |
| 933 | Collins Oil Company | Bartlesville, OK 74006 | Oil & Gas Operator | Dec 2023 |
| 934 | Collins Oil, LLC | Ellinwood, KS 67526 | Oil Operator | Dec 2024 |
| 935 | Colonial Corporation | St Simons Island, GA 31522 | Oil & Gas Operator | Dec 2000 |
| 936 | Colorado Crude E | | Oil Operator | Jan 1986 |
| 937 | Colorado Interst | | Gas Operator | Aug 1995 |
| 938 | Colorado Interstate Gas Company LLC | Colorado Springs, CO 80944 | Oil & Gas Operator | Mar 2025 |
| 939 | Colorado Oil & G | | Oil & Gas Operator | Oct 1987 |
| 940 | Colt Energy Inc | Iola, KS 66749 | Oil & Gas Operator | Jan 2025 |
| 941 | Colt Energy Inco | | Oil & Gas Operator | Dec 1996 |
| 942 | Colt Oil Company | Andrews, TX 79714 | Oil & Gas Operator | Feb 1996 |
| 943 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 944 | Columbia Petrole | | Oil Operator | Sep 1988 |
| 945 | Columbian Production Corporation | Topeka, KS 66601 | Oil Operator | Oct 1999 |
| 946 | Columbian Servic | | Oil & Gas Operator | Nov 1993 |
| 947 | Columbian Services C | | Oil Operator | Jan 1992 |
| 948 | Columbian Services Corporation | Topeka, KS 66603 | Gas Operator | Dec 2009 |
| 949 | Comanche Product | | Oil & Gas Operator | Jan 1992 |
| 950 | Comanche Production, Inc. | Longview, TX 75606 | Oil & Gas Operator | Jan 2006 |
| 951 | Comanche Resources Company | Oklahoma City, OK 73116 | Oil & Gas Operator | Mar 2025 |
| 952 | Commercial Energ | | Gas Operator | Oct 1996 |
| 953 | Commercial Oil - | | Oil Operator | Apr 1994 |
| 954 | Commercial Oil Company, Inc. | Wichita, KS 67204 | Oil Operator | Jun 2001 |
| 955 | Commonwealth Pet | | Oil & Gas Operator | Nov 1995 |
| 956 | Compass Exploration LLC | Hill City, KS 67642 | Oil Operator | Dec 2024 |
| 957 | Compressor Syste | | Oil Operator | May 1991 |
| 958 | Conch Oil, Inc. | Wichita, KS 67202 | Oil Operator | Jun 2002 |
| 959 | Concho Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2015 |
| 960 | Concorde Resources Corporation | Eufaula, OK 74432 | Oil & Gas Operator | Feb 2025 |
| 961 | Condor Energy | | Oil Operator | Aug 1995 |
| 962 | Condor Energy Inc | Great Bend, KS 67530 | Oil & Gas Operator | Oct 2021 |
| 963 | Condor Petroleum | | Oil & Gas Operator | Nov 1990 |
| 964 | Condry Oil Compa | | Oil Operator | May 1992 |
| 965 | Conley, Harry | Colony, KS 66015 | Oil Operator | Nov 2024 |
| 966 | Connell, Mark Allen | Claflin, KS 67525 | Oil Operator | Jan 2025 |
| 967 | Conner, Eugene | Bartlesville, OK 74005 | Oil & Gas Operator | Jul 2020 |
| 968 | Conner, Rick | Winfield, KS 67156 | Oil Operator | Aug 2019 |
| 969 | Conoco Inc. | Houston, TX 77252 | Oil & Gas Operator | Mar 2015 |
| 970 | Conoco Incorpora | | Oil & Gas Operator | Apr 1988 |
| 971 | Conrade Patsy | | Oil Operator | Jan 1986 |
| 972 | Considine, Barry | Burrton, KS 67020 | Gas Operator | Jan 2025 |
| 973 | Consolidated Gas & Energy Corp. | San Diego, CA 92130 | Oil Operator | Apr 2012 |
| 974 | Consolidated Oil | | Oil Operator | Jul 1996 |
| 975 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 976 | Consolidated Oil Well Services, Inc | Chanute, KS 66720 | Oil Operator | Jan 2008 |
| 977 | Continental Brok | | Oil Operator | Oct 1994 |
| 978 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 979 | Continental Energy | Garden City, KS 67846-0918 | Oil & Gas Operator | Jul 2017 |
| 980 | Continental Expl | | Oil Operator | Sep 1991 |
| 981 | Continental Oil | | Oil Operator | Jun 1985 |
| 982 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | May 2025 |
| 983 | Continental Resources, Inc. | Oklahoma City, OK 73126 | Oil & Gas Operator | May 2025 |
| 984 | Continuum Midstream, LLC | Tulsa, OK 74136 | Oil Operator | Jan 2025 |
| 985 | Convest Energy Corporation | Houston, TX 77057 | Oil & Gas Operator | Sep 2014 |
| 986 | Cook Operating C | | Oil Operator | May 1987 |
| 987 | Cook, James A. | Augusta, KS 67010 | Oil Operator | Jul 1997 |
| 988 | Cooke, Donald E./Lee Wanda | Coffeyville, KS 67331 | Oil Operator | Dec 2001 |
| 989 | Cooper Oil Company | Andover, KS 67002 | Oil Operator | Oct 1997 |
| 990 | Cooper Service Co. | | Oil & Gas Operator | Nov 2024 |
| 991 | Cooper, J. M. | Winfield, KS 67119 | Oil Operator | Oct 1997 |
| 992 | Cooper, Lowell E. | Peabody, KS 66866 | Oil Operator | Nov 1987 |
| 993 | Copperhead Creek Enterprises, Inc. | Chautauqua, KS 67334 | Oil Operator | Sep 2019 |
| 994 | Copperhead Oil | Colony, KS 66015 | Oil Operator | Sep 1985 |
| 995 | Coral Coast Petroleum, L.C. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 996 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Feb 2025 |
| 997 | Core S&S LLC | Thayer, KS 66776 | Oil Operator | Dec 2024 |
| 998 | Corie Oil Co., Inc. | Russell, KS 67665 | Oil Operator | Feb 2003 |
| 999 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 1000 | Corlena Oil Company | Amarillo, TX 79101 | Oil & Gas Operator | May 2025 |