| 1 | C & B Operating Inc. | St John, KS 67576 | Oil & Gas Operator | Dec 2025 |
| 2 | C & C Oil | | Oil & Gas Operator | Jan 2004 |
| 3 | C & C Oil & Gas | Ranger, TX 76470 | Oil & Gas Operator | Apr 2026 |
| 4 | C & C Tank Service, Inc. | Sterling, KS 67579 | Oil Operator | Oct 2020 |
| 5 | C & D Supply | Cherokee, OK 73728-5817 | Oil & Gas Operator | Jan 2026 |
| 6 | C & E Oil, LLC | Grenola, KS 67346 | Oil Operator | Nov 2021 |
| 7 | C & E Prod Incor | | Oil Operator | Nov 1996 |
| 8 | C & F Ranch LLC | Iola, KS 66749 | Oil Operator | Dec 2025 |
| 9 | C & G Drilling, Inc | Eureka, KS 67045 | Oil Operator | Dec 2025 |
| 10 | C & G Oil Compan | | Oil & Gas Operator | Dec 1989 |
| 11 | C & H Energy LLC | Blue Mound, KS 66010 | Oil Operator | Nov 2009 |
| 12 | C & J Production LLC | Marion, KS 66861 | Oil & Gas Operator | Feb 2025 |
| 13 | C & J Pumping, Inc. | Sylvia, KS 67581 | Oil & Gas Operator | Dec 2009 |
| 14 | C & K Operating LLC | Kingman, KS 67068 | Oil & Gas Operator | Dec 2025 |
| 15 | C & R Drilling C | | Oil Operator | Aug 1994 |
| 16 | C & R Oil | | Oil Operator | Dec 2025 |
| 17 | C & R Petroleum Company | Duncan, OK 73533-1341 | Oil & Gas Operator | Dec 2025 |
| 18 | C & R Well Servi | | Oil Operator | Sep 1996 |
| 19 | C & R Well Service, A General Partnership | Garnett, KS 66032 | Oil Operator | Dec 2009 |
| 20 | C & S Oil | | Oil Operator | Dec 2019 |
| 21 | C & S Oil Compan | | Oil & Gas Operator | Jun 1992 |
| 22 | C & S Oil Company | Odessa, TX 79763 | Oil & Gas Operator | Nov 2019 |
| 23 | C & S Oil Company, LLC | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 24 | C & S Well Servi | | Oil & Gas Operator | Nov 1995 |
| 25 | C & S Well Servicing Co. | Lyons, KS 67554 | Oil & Gas Operator | Jul 2000 |
| 26 | C A P Operating | | Oil Operator | Sep 1992 |
| 27 | C C & S Oil Oper | | Oil Operator | Apr 1983 |
| 28 | C D Oil | Wellsville, KS 66092 | Oil Operator | Aug 1998 |
| 29 | C D Operating Company Inc | Oklahoma City, OK 73116 | Oil & Gas Operator | Apr 2015 |
| 30 | C F Oil - Frazie | | Oil Operator | Dec 1994 |
| 31 | C G Oil, Inc. | Victoria, KS 67671 | Oil Operator | Dec 2025 |
| 32 | C K Oil Company | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 33 | C M T Petroleum | | Oil Operator | Jul 1995 |
| 34 | C M X Incorporat | | Oil & Gas Operator | Dec 1996 |
| 35 | C N B Enterprises | Yates Center, KS 66783 | Oil & Gas Operator | Jan 2009 |
| 36 | C R A C O Incorp | | Oil Operator | May 1988 |
| 37 | C W Oil Producer | | Oil Operator | Oct 1998 |
| 38 | C-V Oil Company | Memphis, TN 38103 | Oil Operator | Jun 1998 |
| 39 | C. D. Oil, Inc. | Wellsville, KS 66092 | Oil Operator | Dec 2009 |
| 40 | C. F. Oil, A General Partnership | Lake Lotawana, MO 64086 | Oil Operator | Nov 2025 |
| 41 | C. H. Todd, Inc. | Wichita, KS 67212 | Oil & Gas Operator | Dec 2019 |
| 42 | C12 Kansas Oil, LLC | Denver, CO 80202 | Oil Operator | Dec 2009 |
| 43 | C3oil, LLC | New Strawn, KS 66839 | Oil Operator | Dec 2025 |
| 44 | C5 Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Dec 2019 |
| 45 | Cabot Oil & Gas Corporation | Houston, TX 77024 | Oil & Gas Operator | Jan 2026 |
| 46 | Cabot Petroleum | | Oil & Gas Operator | Oct 1996 |
| 47 | Caerus Kansas LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2026 |
| 48 | Caerus Washco LLC | Denver, CO 80202 | Gas Operator | Mar 2015 |
| 49 | Cahoj, H. Drilling | McDonald, KS 67745 | Oil Operator | Jan 2000 |
| 50 | Cain, Jim | Great Bend, KS 67530 | Oil Operator | Feb 2009 |
| 51 | Cal Oil | | Oil Operator | Jul 1986 |
| 52 | Caldwell Entr In | | Oil Operator | Dec 1993 |
| 53 | Calgary Energy LLC | Collinsville, OK 74021 | Oil & Gas Operator | Feb 2026 |
| 54 | Calvin Explorati | | Oil & Gas Operator | Oct 1991 |
| 55 | Calvin Noah, LLC | Valley Center, KS 67147 | Oil Operator | Dec 2025 |
| 56 | Cam Development | | Oil & Gas Operator | Dec 1990 |
| 57 | Cambern, Rex | Montgomery, TX 77356 | Oil Operator | Jan 1996 |
| 58 | Cambria Corporation | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 59 | Cambron, Paul L. | Ness City, KS 67560 | Oil & Gas Operator | Dec 2019 |
| 60 | Camio Enterprises, LLC | Augusta, KS 67010 | Oil Operator | Dec 2025 |
| 61 | Camio Oil Co. | | Oil Operator | Dec 2004 |
| 62 | Camio Oil Compan | | Oil & Gas Operator | Apr 1991 |
| 63 | Campbell Energy LLC | Carmi, IL 62821 | Oil Operator | Dec 2025 |
| 64 | Campbell Robert | | Oil & Gas Operator | Aug 1990 |
| 65 | Campbell, Robert E. | Wichita, KS 67206 | Oil & Gas Operator | May 2019 |
| 66 | Camwest Limited Partnership | Denver, CO 80202 | Oil & Gas Operator | Apr 2004 |
| 67 | Canaday Oil Corp | Goddard, KS 67052 | Oil & Gas Operator | Dec 2025 |
| 68 | Cannan Calvin B | | Oil Operator | Jul 1991 |
| 69 | Cannon Oil Co. | | Oil Operator | Dec 2009 |
| 70 | Canyon Operating LLC | Dallas, TX 75225 | Oil & Gas Operator | Apr 2026 |
| 71 | Cap Operating Inc. | Borger, TX 79008 | Oil & Gas Operator | Apr 2026 |
| 72 | Capco Resource Corporation | Orange,, CA 92869 | Oil Operator | Sep 2007 |
| 73 | Capital Energy Group, Inc. | Bardonia, NY 10954 | Oil Operator | Jan 1998 |
| 74 | Captain'S Oil Inc. | Louisburg, KS 66053 | Oil Operator | Sep 2003 |
| 75 | Cara Ventures In | | Oil Operator | May 1995 |
| 76 | Carageannis, Paul C | Attica, KS 67009 | Oil Operator | Feb 2001 |
| 77 | Caravel Energy O | | Oil & Gas Operator | Feb 1987 |
| 78 | Carbon Energy Corporation (USA) | Denver, CO 80290 | Oil & Gas Operator | Jul 2004 |
| 79 | Cardinal Energy | | Oil & Gas Operator | Dec 2008 |
| 80 | Carl E Gungoll Exploration LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Feb 2026 |
| 81 | Carl, William E. | Corpus Christi, TX 78471 | Oil Operator | Jul 1986 |
| 82 | Carlin Oil & Gas | | Oil Operator | Jan 1994 |
| 83 | Carlon Oil & Gas Co Inc | Derby, KS 67037 | Gas Operator | Dec 2025 |
| 84 | Carmen Schmitt, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 85 | Caroden Energy LLC | Wake Forest, NC 27587 | Oil Operator | Oct 2025 |
| 86 | Carr Exploration | | Oil & Gas Operator | Sep 1993 |
| 87 | Carrie Exploration & Development, LLC | Hays, KS 67601 | Oil & Gas Operator | Dec 2019 |
| 88 | Carroll Energy, LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Nov 2023 |
| 89 | Carroll Oil Prod | | Oil Operator | Jan 1986 |
| 90 | Carroll T L Ente | | Gas Operator | Aug 1989 |
| 91 | Carroll, Jon M. | Great Bend, KS 67530 | Oil Operator | Dec 2001 |
| 92 | Carstan Petroleu | | Oil Operator | May 1983 |
| 93 | Carter, Calvin Gene | Sedan, KS 67361 | Oil Operator | Nov 2018 |
| 94 | Carter, Eugene J. | Longton, KS 67352 | Oil Operator | Jan 1998 |
| 95 | Cascade Oil (Dba) | Ness City, KS 67560 | Oil Operator | Mar 1998 |
| 96 | Cascade Oil Comp | | Oil & Gas Operator | Dec 1994 |
| 97 | Case Oil & Gas I | | Oil & Gas Operator | Apr 1992 |
| 98 | Casebeer, Inc. | McPherson, KS 67460 | Oil Operator | Dec 2025 |
| 99 | Casey Musgrove Oil Company Inc | Ponca City, OK 74602 | Oil & Gas Operator | Feb 2026 |
| 100 | Cash Flow Oil | | Oil Operator | Jul 2003 |