| 701 | C12 Kansas Oil, LLC | Denver, CO 80202 | Oil Operator | Dec 2009 |
| 702 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | Jun 2025 |
| 703 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 704 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 705 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 706 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 707 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 708 | Cahoj, H. Drilling | McDonald, KS 67745 | Oil Operator | Jan 2000 |
| 709 | Cain, Jim | Great Bend, KS 67530 | Oil Operator | Feb 2009 |
| 710 | Cal Oil | | Oil Operator | Jul 1986 |
| 711 | Calam Oil Prop - | | Gas Operator | Sep 1999 |
| 712 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 713 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Aug 2025 |
| 714 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 715 | Calvin Noah, LLC | Valley Center, KS 67147 | Oil Operator | Jun 2025 |
| 716 | Cam Development | | Oil & Gas Operator | Dec 1990 |
| 717 | Cambern, Rex | Montgomery, TX 77356 | Oil Operator | Jan 1996 |
| 718 | Cambria Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 719 | Cambron, Paul L. | Ness City, KS 67560 | Oil & Gas Operator | Dec 2019 |
| 720 | Camio Enterprises, LLC | Augusta, KS 67010 | Oil Operator | Jun 2025 |
| 721 | Camio Oil Co. | | Oil Operator | Dec 2004 |
| 722 | Camio Oil Compan | | Oil & Gas Operator | Apr 1991 |
| 723 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Jun 2025 |
| 724 | Campbell Robert | | Oil & Gas Operator | Aug 1990 |
| 725 | Campbell, Robert E. | Wichita, KS 67206 | Oil & Gas Operator | May 2019 |
| 726 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 727 | Canaday Oil Corp | Goddard, KS 67052 | Oil & Gas Operator | Jun 2025 |
| 728 | Cannan Calvin B | | Oil Operator | Jul 1991 |
| 729 | Cannon Oil Co. | | Oil Operator | Dec 2009 |
| 730 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 731 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | Dec 2025 |
| 732 | Capco Resource Corporation | Orange,, CA 92869 | Oil Operator | Sep 2007 |
| 733 | Capital Energy Group, Inc. | Bardonia, NY 10954 | Oil Operator | Jan 1998 |
| 734 | Captain'S Oil Inc. | Louisburg, KS 66053 | Oil Operator | Sep 2003 |
| 735 | Cara Ventures In | | Oil Operator | May 1995 |
| 736 | Carageannis, Paul C | Attica, KS 67009 | Oil Operator | Feb 2001 |
| 737 | Caravel Energy O | | Oil & Gas Operator | Feb 1987 |
| 738 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 739 | Cardinal Energy | | Oil & Gas Operator | Dec 2008 |
| 740 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Aug 2025 |
| 741 | Carl, William E. | Corpus Christi, TX 78471 | Oil Operator | Jul 1986 |
| 742 | Carlin Oil & Gas | | Oil Operator | Jan 1994 |
| 743 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2024 |
| 744 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Jun 2025 |
| 745 | Caroden Energy LLC | Wake Forest, NC 27587 | Oil Operator | Jun 2025 |
| 746 | Carr Exploration | | Oil & Gas Operator | Sep 1993 |
| 747 | Carrie Exploration & Development, LLC | Hays, KS 67601 | Oil & Gas Operator | Feb 2025 |
| 748 | Carroll Energy, LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2023 |
| 749 | Carroll Oil Prod | | Oil Operator | Jan 1986 |
| 750 | Carroll T L Ente | | Gas Operator | Aug 1989 |
| 751 | Carroll, Jon M. | Great Bend, KS 67530 | Oil Operator | Dec 2001 |
| 752 | Carstan Petroleu | | Oil Operator | May 1983 |
| 753 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 754 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 755 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 756 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 757 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 758 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | Jun 2025 |
| 759 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Aug 2025 |
| 760 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 761 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | Sep 2025 |
| 762 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 763 | Castelli Exploration Inc | Oklahoma City, OK 73162 | Oil & Gas Operator | Aug 2025 |
| 764 | Castle Resources | | Oil Operator | Jul 2002 |
| 765 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Jun 2025 |
| 766 | Castle-Rock Prod | | Oil Operator | Mar 1992 |
| 767 | Cat Energy, LLC | Galva, KS 67443 | Oil Operator | Aug 2008 |
| 768 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 769 | Catfish Oil | | Oil Operator | May 2025 |
| 770 | Catron Oil Div - | | Oil Operator | Aug 1989 |
| 771 | Catron Oil Division | | Oil Operator | Feb 2000 |
| 772 | Catt Drilling Co. | Holyrood, KS 67450 | Oil Operator | Aug 1989 |
| 773 | Cattlemans Oil O | | Oil Operator | Nov 1995 |
| 774 | Cattlemans Oil Operations | | Oil Operator | Dec 2009 |
| 775 | Cattlemans Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 776 | Cec Operations LLC | Udall, KS 67146 | Oil & Gas Operator | Jun 2025 |
| 777 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Sep 2025 |
| 778 | Centennial Energy Company | Torrance, CA 90503 | Oil Operator | Jan 2000 |
| 779 | Central Crude Corp. | Wichita, KS 67206 | Oil Operator | Mar 2014 |
| 780 | Central Energy C | | Oil & Gas Operator | Jun 1994 |
| 781 | Central Energy Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 1998 |
| 782 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 783 | Central Resources, Inc. | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 784 | Central States Energy LLC | Scottsdale, AZ 85260 | Gas Operator | Apr 2012 |
| 785 | Central States O | | Oil & Gas Operator | May 1992 |
| 786 | Central States Oil And Gas Co. | Cherryvale, KS 67335 | Gas Operator | Feb 2005 |
| 787 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Jul 2025 |
| 788 | Century Oil Mana | | Oil Operator | Apr 1987 |
| 789 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2025 |
| 790 | CFM 66 LLC | McPherson, KS 67460 | Oil & Gas Operator | May 2025 |
| 791 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 792 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | Oct 2025 |
| 793 | Challenger Exploration | | Oil Operator | Nov 2014 |
| 794 | Champion Petrole | | Oil Operator | Jan 1992 |
| 795 | Chance Drilling Company | Commerce City, CO 80022 | Oil Operator | Sep 2009 |
| 796 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 797 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Dec 2025 |
| 798 | Chapman Energy O | | Oil & Gas Operator | Jun 1993 |
| 799 | Chapman Energy Oklahoma Inc | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 800 | Chapman Explorat | | Oil Operator | Feb 1988 |