| 801 | Cattlemans Oil Operations | | Oil Operator | Dec 2009 |
| 802 | Cattlemans Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 803 | Cec Operations LLC | Udall, KS 67146 | Oil & Gas Operator | Sep 2025 |
| 804 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Dec 2025 |
| 805 | Centennial Energy Company | Torrance, CA 90503 | Oil Operator | Jan 2000 |
| 806 | Central Crude Corp. | Wichita, KS 67206 | Oil Operator | Mar 2014 |
| 807 | Central Energy C | | Oil & Gas Operator | Jun 1994 |
| 808 | Central Energy Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 1998 |
| 809 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Dec 2025 |
| 810 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 811 | Central States Energy LLC | Scottsdale, AZ 85260 | Gas Operator | Apr 2012 |
| 812 | Central States O | | Oil & Gas Operator | May 1992 |
| 813 | Central States Oil And Gas Co. | Cherryvale, KS 67335 | Gas Operator | Feb 2005 |
| 814 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Nov 2025 |
| 815 | Century Oil Mana | | Oil Operator | Apr 1987 |
| 816 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Nov 2025 |
| 817 | CFM 66 LLC | McPherson, KS 67460 | Oil & Gas Operator | Sep 2025 |
| 818 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 819 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Jan 2026 |
| 820 | Challenger Exploration | | Oil Operator | Nov 2014 |
| 821 | Champion Petrole | | Oil Operator | Jan 1992 |
| 822 | Chance Drilling Company | Commerce City, CO 80022 | Oil Operator | Sep 2009 |
| 823 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 824 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Feb 2026 |
| 825 | Chapman Energy O | | Oil & Gas Operator | Jun 1993 |
| 826 | Chapman Energy Oklahoma Inc | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 827 | Chapman Explorat | | Oil Operator | Feb 1988 |
| 828 | Charter Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Sep 2025 |
| 829 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 830 | Charter Production Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2018 |
| 831 | Chase Exploratio | | Oil Operator | Sep 1992 |
| 832 | Chase Well Servi | | Oil Operator | Jun 1989 |
| 833 | Chase Well Service, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2004 |
| 834 | Chase, Glen Drilling | Chanute, KS 66720 | Oil Operator | Jul 1996 |
| 835 | Chase, Michael | Chanute, KS 66720 | Oil Operator | Mar 1999 |
| 836 | Chautauqua Oil And Gas LLC | Tulsa, OK 74145 | Oil & Gas Operator | Sep 2025 |
| 837 | CHC III Paola Energy, LLC | | Oil Operator | Sep 2025 |
| 838 | Cheaspeake Energy Ma | | Gas Operator | Jul 2005 |
| 839 | Chenoweth, Dean | Haviland, KS 67059 | Oil Operator | Jun 1994 |
| 840 | Cherokee Basin Pipeline LLC | Mason, MI 48854 | Gas Operator | Sep 2025 |
| 841 | Cherokee Energy | | Oil & Gas Operator | Oct 1988 |
| 842 | Cherokee Oil | | Oil Operator | Sep 2025 |
| 843 | Cherokee Valley | | Oil Operator | May 1993 |
| 844 | Cherokee Wells LLC | Fredonia, KS 66736 | Oil & Gas Operator | Sep 2025 |
| 845 | Cherokeenrg LLC | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2019 |
| 846 | Cherryvale Gas Co. | Cherryvale, KS 67335 | Oil Operator | Jan 2002 |
| 847 | Chesapeake Energy | | Oil & Gas Operator | Dec 2009 |
| 848 | Chesapeake Energy Ma | | Gas Operator | Jun 2016 |
| 849 | Chesapeake Energy Marketing, Inc. | | Oil & Gas Operator | Jan 2025 |
| 850 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 851 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2025 |
| 852 | Chesney Marilyn | | Oil Operator | Jul 1987 |
| 853 | Chesney Oil Comp | | Oil Operator | Sep 1989 |
| 854 | Chestnut Production Company | Towanda, KS 67144 | Oil Operator | Jan 1999 |
| 855 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 856 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 857 | Chew Bill Incorp | | Oil & Gas Operator | Mar 1994 |
| 858 | Chew, Bill, Inc. | Hutchinson, KS 67502 | Oil Operator | Sep 2002 |
| 859 | Cheyenne Explora | | Oil Operator | Jun 1983 |
| 860 | Cheyenne Oil Services, Inc. | Ness City, KS 67560 | Oil Operator | Nov 2023 |
| 861 | Chief Drilling C | | Oil & Gas Operator | Feb 1995 |
| 862 | Chief Drilling Company | | Oil Operator | Jun 1985 |
| 863 | Chief Drilling, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 1997 |
| 864 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Dec 2025 |
| 865 | Chinook Energy C | | Oil Operator | Jul 1991 |
| 866 | Chipmunk'S Oil & Gas Lease Oper., Inc. | Copan, OK 74022 | Oil Operator | Dec 1996 |
| 867 | Chisholm Trail Resources Inc | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 868 | Chisum Oil & Gas, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Sep 2025 |
| 869 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Dec 2025 |
| 870 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Sep 2025 |
| 871 | Cholla Resources | | Oil Operator | Oct 1995 |
| 872 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 873 | Chooch Incorpora | | Gas Operator | Dec 1994 |
| 874 | Chriestenson Oil LLC | Neosho Falls, KS 66758 | Oil Operator | Sep 2025 |
| 875 | Chris Batchman Inc. | Ellinwood, KS 67526 | Oil Operator | Sep 2025 |
| 876 | Chris Melander Drilling | | Oil Operator | Jun 2015 |
| 877 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 878 | Christa Oil Comp | | Oil Operator | Nov 1994 |
| 879 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 880 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 881 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Feb 2026 |
| 882 | Cinab, Inc. | FT. Scott, KS 66701 | Oil Operator | Jan 1998 |
| 883 | Cinco Exploratio | | Oil & Gas Operator | Jan 1988 |
| 884 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 885 | Circle E Oil - E | | Oil Operator | May 1990 |
| 886 | Circle K Enterprises | | Oil & Gas Operator | Aug 2023 |
| 887 | Circle L Exploration | Independence, KS 67301 | Gas Operator | May 2015 |
| 888 | Circle T Oil | | Oil Operator | Nov 2024 |
| 889 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 890 | Citadel Oil LLC | Edmond, OK 73083 | Oil Operator | Sep 2025 |
| 891 | Citadel Prod Company Inc | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 892 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 893 | Citation Oil & G | | Oil & Gas Operator | Dec 1996 |
| 894 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Feb 2026 |
| 895 | City Of Chanute | Chanute, KS 66720 | Oil Operator | Feb 1994 |
| 896 | City Of Garden City, Kansas | Garden City, KS 67846 | Gas Operator | Sep 2025 |
| 897 | City Of Hugoton, Kansas | Hugoton, KS 67951 | Gas Operator | Aug 2025 |
| 898 | City Of Satanta | Satanta, KS 67870 | Gas Operator | Sep 2025 |
| 899 | CJ Oil Inc | Madison, KS 66860 | Oil Operator | Sep 2025 |
| 900 | CK Oil | | Oil Operator | Aug 2025 |