| 801 | Chesapeake Energy Ma | | Gas Operator | Jun 2016 |
| 802 | Chesapeake Energy Marketing, Inc. | | Oil & Gas Operator | May 2026 |
| 803 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Sep 2026 |
| 804 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | May 2026 |
| 805 | Chesney Marilyn | | Oil Operator | Jul 1987 |
| 806 | Chesney Oil Comp | | Oil Operator | Sep 1989 |
| 807 | Chestnut Production Company | Towanda, KS 67144 | Oil Operator | Jan 1999 |
| 808 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 809 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Sep 2026 |
| 810 | Chew Bill Incorp | | Oil & Gas Operator | Mar 1994 |
| 811 | Chew, Bill, Inc. | Hutchinson, KS 67502 | Oil Operator | Sep 2002 |
| 812 | Cheyenne Explora | | Oil Operator | Jun 1983 |
| 813 | Cheyenne Oil Services, Inc. | Ness City, KS 67560 | Oil Operator | Nov 2023 |
| 814 | Chief Drilling C | | Oil & Gas Operator | Feb 1995 |
| 815 | Chief Drilling Company | | Oil Operator | Jun 1985 |
| 816 | Chief Drilling, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 1997 |
| 817 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | Jul 2026 |
| 818 | Chinook Energy C | | Oil Operator | Jul 1991 |
| 819 | Chipmunk'S Oil & Gas Lease Oper., Inc. | Copan, OK 74022 | Oil Operator | Dec 1996 |
| 820 | Chisum Oil & Gas, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | May 2026 |
| 821 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Jul 2026 |
| 822 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | May 2026 |
| 823 | Cholla Resources | | Oil Operator | Oct 1995 |
| 824 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 825 | Chooch Incorpora | | Gas Operator | Dec 1994 |
| 826 | Chriestenson Oil LLC | Neosho Falls, KS 66758 | Oil Operator | May 2026 |
| 827 | Chris Batchman Inc. | Ellinwood, KS 67526 | Oil Operator | May 2026 |
| 828 | Chris Melander Drilling | | Oil Operator | Jun 2015 |
| 829 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 830 | Christa Oil Comp | | Oil Operator | Nov 1994 |
| 831 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 832 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 833 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | May 2026 |
| 834 | Cinab, Inc. | FT. Scott, KS 66701 | Oil Operator | Jan 1998 |
| 835 | Cinco Exploratio | | Oil & Gas Operator | Jan 1988 |
| 836 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 837 | Circle E Oil - E | | Oil Operator | May 1990 |
| 838 | Circle K Enterprises | | Oil & Gas Operator | Aug 2023 |
| 839 | Circle T Oil | | Oil Operator | Nov 2024 |
| 840 | Cisco Operating LLC | Plano, TX 75024 | Oil & Gas Operator | Jul 2026 |
| 841 | Citadel Oil LLC | Edmond, OK 73083 | Oil Operator | May 2026 |
| 842 | Citadel Prod Company Inc | Denver, CO 80201 | Oil Operator | Sep 1996 |
| 843 | Citation Energy | | Oil & Gas Operator | Jul 1993 |
| 844 | Citation Oil & G | | Oil & Gas Operator | Dec 1996 |
| 845 | Citation Oil & Gas Corp | Houston, TX 77269 | Oil & Gas Operator | Sep 2026 |
| 846 | City Of Chanute | Chanute, KS 66720 | Oil Operator | Feb 1994 |
| 847 | City Of Garden City, Kansas | Garden City, KS 67846 | Gas Operator | May 2026 |
| 848 | City Of Hugoton, Kansas | Hugoton, KS 67951 | Gas Operator | May 2026 |
| 849 | City Of Satanta | Satanta, KS 67870 | Gas Operator | May 2026 |
| 850 | CJ Oil Inc | Madison, KS 66860 | Oil Operator | May 2026 |
| 851 | CK Oil | | Oil Operator | Mar 2026 |
| 852 | CK Oil & Gas LLC | Herington, KS 67449 | Oil & Gas Operator | Dec 2023 |
| 853 | Cla-Mar Oil Company, LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 854 | Claassen Oil And Gas Inc | Estes Park, CO 80517 | Oil & Gas Operator | May 2026 |
| 855 | Claibourn, Darrel R. | Neodesha, KS 66757 | Oil Operator | Oct 2011 |
| 856 | Clair Oil, Inc. | Russell, KS 67665 | Oil Operator | Nov 2019 |
| 857 | Clapp Oil LLC | | Oil Operator | May 2026 |
| 858 | Clarco Gas Co., Inc. | Westmont, IL 60559 | Oil Operator | Dec 2011 |
| 859 | Clark B & Cahoj | | Oil Operator | Apr 1995 |
| 860 | Clark Energy, LLC | Chanute, KS 66720 | Oil & Gas Operator | Jun 2022 |
| 861 | Clark Exploratio | | Oil & Gas Operator | Jun 1991 |
| 862 | Clark Exploration Company | Highlands Ranch, CO 80126-7645 | Oil & Gas Operator | Jul 2024 |
| 863 | Clark Oil, LLC | Wellsville, KS 66092 | Oil Operator | Apr 2022 |
| 864 | Clark Operating Services Inc | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 865 | Clark, Daryl | Phillipsburg, KS 67661 | Oil Operator | May 2026 |
| 866 | Clark, Robert A. | Wichita, KS 67202 | Gas Operator | Jul 1990 |
| 867 | Clarke Corporati | Medicine Lodge, KS 67104 | Oil & Gas Operator | May 2026 |
| 868 | Class Oil | Hays, KS 67601 | Oil Operator | Jun 1991 |
| 869 | Classic Well Service, Inc. | Claflin, KS 67525 | Oil Operator | Dec 2019 |
| 870 | Clausing, Garry | Coffeyville, KS 67337 | Oil Operator | Apr 2024 |
| 871 | Claussen Roy A & | | Oil Operator | Jun 1986 |
| 872 | Clawson, Merle Eugene | McCune, KS 66753 | Oil Operator | Nov 2016 |
| 873 | Clayton Corp Petro & NTRL Gas Prodn | Lakewood, CO 80228 | Oil & Gas Operator | Dec 2009 |
| 874 | Clayton Corporation | Golden, CO 80401 | Oil & Gas Operator | Dec 2019 |
| 875 | Clear Creek Exploration LLC | Fredonia, KS 66736 | Gas Operator | Apr 2011 |
| 876 | Cleary Petroleum Corporation | Edmond, OK 73083 | Oil & Gas Operator | Jul 2019 |
| 877 | Cleaver Loraine | | Oil Operator | Dec 1996 |
| 878 | Cleaver, Loraine G. (Deceased) Estate | Iola, KS 66749 | Oil Operator | Nov 2009 |
| 879 | Clinton Bowers Estate | Manhatten, KS 66502 | Oil Operator | Dec 1998 |
| 880 | Clinton Producti | | Oil Operator | Dec 1989 |
| 881 | Clinton Production, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Aug 2025 |
| 882 | Clinton, Orville L., Jr. | Paola, KS 66071 | Oil Operator | Apr 2005 |
| 883 | Clothier, David W. | Eastborough, KS 67206 | Oil & Gas Operator | Dec 2019 |
| 884 | Clover Oil Company | | Oil Operator | May 2026 |
| 885 | Clubine, Jim L. | Independence, KS 67301 | Oil Operator | Jan 2026 |
| 886 | Clute Oil Corporation | Cherry Hills VIllage, CO 80113 | Oil & Gas Operator | May 2026 |
| 887 | Clyde Petroleum | | Oil & Gas Operator | Dec 1988 |
| 888 | CM Oil Co. | FT Stockton, TX 79735 | Oil & Gas Operator | Sep 2026 |
| 889 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | May 2026 |
| 890 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 891 | Co-Co Incorporat | | Oil Operator | Oct 1989 |
| 892 | Coachman Energy Operating Co, LLC | Englewood, CO 80111 | Oil Operator | May 2024 |
| 893 | Coal Creek Energy, LLC | Overland Park, KS 66221 | Oil Operator | Dec 2019 |
| 894 | Coastal Oil & Ga | | Oil & Gas Operator | Oct 1996 |
| 895 | Coastal Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 896 | Coastal Oil & Gas Corp | Houston, TX 77252 | Oil & Gas Operator | Dec 2009 |
| 897 | Coats Energy, Inc. | Wichita, KS 67201 | Oil & Gas Operator | May 2026 |
| 898 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 899 | Cobra Oil & Gas | | Oil & Gas Operator | Jul 1995 |
| 900 | Cobra Oil & Gas Corporation | Wichita Falls, TX 76307 | Oil & Gas Operator | Sep 2026 |