| 801 | Chapman Explorat | | Oil Operator | Feb 1988 |
| 802 | Charter Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Dec 2024 |
| 803 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 804 | Charter Production Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2018 |
| 805 | Chase Exploratio | | Oil Operator | Sep 1992 |
| 806 | Chase Well Servi | | Oil Operator | Jun 1989 |
| 807 | Chase Well Service, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2004 |
| 808 | Chase, Glen Drilling | Chanute, KS 66720 | Oil Operator | Jul 1996 |
| 809 | Chase, Michael | Chanute, KS 66720 | Oil Operator | Mar 1999 |
| 810 | Chautauqua Oil And Gas LLC | Tulsa, OK 74145 | Oil & Gas Operator | Nov 2024 |
| 811 | CHC III Paola Energy, LLC | | Oil Operator | Dec 2024 |
| 812 | Chenoweth, Dean | Haviland, KS 67059 | Oil Operator | Jun 1994 |
| 813 | Cherokee Basin Pipeline LLC | Mason, MI 48854 | Gas Operator | Dec 2024 |
| 814 | Cherokee Energy | | Oil & Gas Operator | Oct 1988 |
| 815 | Cherokee Oil | | Oil Operator | Dec 2024 |
| 816 | Cherokee Valley | | Oil Operator | May 1993 |
| 817 | Cherokee Wells LLC | Fredonia, KS 66736 | Oil & Gas Operator | Dec 2024 |
| 818 | Cherokeenrg LLC | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2019 |
| 819 | Cherryvale Gas Co. | Cherryvale, KS 67335 | Oil Operator | Jan 2002 |
| 820 | Chesapeake Energy | | Oil & Gas Operator | Dec 2009 |
| 821 | Chesapeake Energy Ma | | Gas Operator | Jun 2016 |
| 822 | Chesapeake Energy Marketing, Inc. | | Oil & Gas Operator | Dec 2024 |
| 823 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Apr 2025 |
| 824 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2024 |
| 825 | Chesney Marilyn | | Oil Operator | Jul 1987 |
| 826 | Chesney Oil Comp | | Oil Operator | Sep 1989 |
| 827 | Chestnut Production Company | Towanda, KS 67144 | Oil Operator | Jan 1999 |
| 828 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 829 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 830 | Chew Bill Incorp | | Oil & Gas Operator | Mar 1994 |
| 831 | Chew, Bill, Inc. | Hutchinson, KS 67502 | Oil Operator | Sep 2002 |
| 832 | Cheyenne Explora | | Oil Operator | Jun 1983 |
| 833 | Cheyenne Oil Services, Inc. | Ness City, KS 67560 | Oil Operator | Nov 2023 |
| 834 | Chief Drilling C | | Oil & Gas Operator | Feb 1995 |
| 835 | Chief Drilling Company | | Oil Operator | Jun 1985 |
| 836 | Chief Drilling, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 1997 |
| 837 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Feb 2025 |
| 838 | Chinook Energy C | | Oil Operator | Jul 1991 |
| 839 | Chipmunk'S Oil & Gas Lease Oper., Inc. | Copan, OK 74022 | Oil Operator | Dec 1996 |
| 840 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 841 | Chisum Oil & Gas, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2024 |
| 842 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Feb 2025 |
| 843 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Dec 2024 |
| 844 | Cholla Resources | | Oil Operator | Oct 1995 |
| 845 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 846 | Chooch Incorpora | | Gas Operator | Dec 1994 |
| 847 | Chriestenson Oil LLC | Neosho Falls, KS 66758 | Oil Operator | Dec 2024 |
| 848 | Chris Batchman Inc. | Ellinwood, KS 67526 | Oil Operator | Dec 2024 |
| 849 | Chris Melander Drilling | | Oil Operator | Jun 2015 |
| 850 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 851 | Christa Oil Comp | | Oil Operator | Nov 1994 |
| 852 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 853 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 854 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Apr 2025 |
| 855 | Cinab, Inc. | FT. Scott, KS 66701 | Oil Operator | Jan 1998 |
| 856 | Cinco Exploratio | | Oil & Gas Operator | Jan 1988 |
| 857 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 858 | Circle E Oil - E | | Oil Operator | May 1990 |
| 859 | Circle K Enterprises | | Oil & Gas Operator | Jun 2024 |
| 860 | Circle L Exploration | Independence, KS 67301 | Gas Operator | May 2015 |
| 861 | Circle T Oil | | Oil Operator | Nov 2024 |
| 862 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Feb 2025 |
| 863 | Citadel Oil LLC | Edmond, OK 73083 | Oil Operator | Dec 2024 |
| 864 | Citadel Production Company, Inc. | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 865 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 866 | Citation Oil & G | | Oil & Gas Operator | Dec 1996 |
| 867 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Apr 2025 |
| 868 | City Of Chanute | Chanute, KS 66720 | Oil Operator | Feb 1994 |
| 869 | City Of Garden City, Kansas | Garden City, KS 67846 | Gas Operator | Dec 2024 |
| 870 | City Of Hugoton, Kansas | Hugoton, KS 67951 | Gas Operator | Dec 2024 |
| 871 | City Of Satanta | Satanta, KS 67870 | Gas Operator | Sep 2024 |
| 872 | CJ Oil Inc | Madison, KS 66860 | Oil Operator | Dec 2024 |
| 873 | CK Oil | | Oil Operator | Aug 2024 |
| 874 | CK Oil & Gas LLC | Herington, KS 67449 | Oil & Gas Operator | Dec 2024 |
| 875 | Cla-Mar Oil Company, LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 876 | Claassen Oil And Gas, Inc. | Estes Park, CO 80517 | Oil & Gas Operator | Dec 2024 |
| 877 | Claibourn, Darrel R. | Neodesha, KS 66757 | Oil Operator | Oct 2011 |
| 878 | Clair Oil, Inc. | Russell, KS 67665 | Oil Operator | Nov 2019 |
| 879 | Clapp Oil LLC | | Oil Operator | Dec 2024 |
| 880 | Clarco Gas Co., Inc. | Westmont, IL 60559 | Oil Operator | Dec 2011 |
| 881 | Clark B & Cahoj | | Oil Operator | Apr 1995 |
| 882 | Clark Energy, LLC | Chanute, KS 66720 | Oil & Gas Operator | Jun 2022 |
| 883 | Clark Exploratio | | Oil & Gas Operator | Jun 1991 |
| 884 | Clark Exploration Co. | Highlands Ranch, CO 80126-7645 | Oil & Gas Operator | Nov 2024 |
| 885 | Clark Oil, LLC | Wellsville, KS 66092 | Oil Operator | Apr 2022 |
| 886 | Clark Operating Services, Inc. | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 887 | Clark, Daryl | Phillipsburg, KS 67661 | Oil Operator | Nov 2024 |
| 888 | Clark, Robert A. | Wichita, KS 67202 | Gas Operator | Jul 1990 |
| 889 | Clarke Corporati | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2024 |
| 890 | Class Oil | Hays, KS 67601 | Oil Operator | Jun 1991 |
| 891 | Classic Well Service, Inc. | Claflin, KS 67525 | Oil Operator | Dec 2019 |
| 892 | Clausing, Garry | Coffeyville, KS 67337 | Oil Operator | Apr 2024 |
| 893 | Claussen Roy A & | | Oil Operator | Jun 1986 |
| 894 | Clawson, Merle Eugene | McCune, KS 66753 | Oil Operator | Nov 2016 |
| 895 | Clayton Corp Petro & NTRL Gas Prodn | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2009 |
| 896 | Clayton Corporat | | Oil & Gas Operator | Jun 1994 |
| 897 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 898 | Clear Creek Exploration LLC | Fredonia, KS 66736 | Gas Operator | Apr 2011 |
| 899 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 900 | Cleaver Loraine | | Oil Operator | Dec 1996 |