| 101 | Cash Flow Oil | | Oil Operator | Jul 2003 |
| 102 | Casillas Petroleum Corp | Satanta, KS 67870 | Oil & Gas Operator | May 2025 |
| 103 | Casino Petroleum | | Oil Operator | Dec 1996 |
| 104 | Castelli Exploration, Inc. | Oklahoma City, OK 73162 | Oil & Gas Operator | Apr 2025 |
| 105 | Castle Resources | | Oil Operator | Jul 2002 |
| 106 | Castle Resources, Inc. | Russell, KS 67665 | Oil & Gas Operator | Mar 2025 |
| 107 | Castle-Rock Prod | | Oil Operator | Mar 1992 |
| 108 | Cat Energy, LLC | Galva, KS 67443 | Oil Operator | Aug 2008 |
| 109 | Catfish Minerals LLC | Dallas, TX 75240 | Oil & Gas Operator | Sep 2014 |
| 110 | Catfish Oil | | Oil Operator | Feb 2025 |
| 111 | Catron Oil Div - | | Oil Operator | Aug 1989 |
| 112 | Catron Oil Division | | Oil Operator | Feb 2000 |
| 113 | Catt Drilling Co. | Holyrood, KS 67450 | Oil Operator | Aug 1989 |
| 114 | Cattlemans Oil O | | Oil Operator | Nov 1995 |
| 115 | Cattlemans Oil Operations | | Oil Operator | Dec 2009 |
| 116 | Cattlemans Oil Operations LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 117 | CDC Oil, LLC | Chanute, KS 66720 | Oil Operator | Feb 2025 |
| 118 | Cec Operations LLC | Udall, KS 67146 | Oil & Gas Operator | Mar 2025 |
| 119 | Ceja Corporation | Tulsa, OK 74172 | Oil & Gas Operator | Apr 2025 |
| 120 | Centennial Energy Company | Torrance, CA 90503 | Oil Operator | Jan 2000 |
| 121 | Central Crude Corp. | Wichita, KS 67206 | Oil Operator | Mar 2014 |
| 122 | Central Energy C | | Oil & Gas Operator | Jun 1994 |
| 123 | Central Energy Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 1998 |
| 124 | Central Operating Inc | Denver, CO 80202 | Oil & Gas Operator | Jun 2025 |
| 125 | Central Resources Inc | Denver, CO 80203 | Oil & Gas Operator | Dec 2019 |
| 126 | Central States Energy LLC | Scottsdale, AZ 85260 | Gas Operator | Apr 2012 |
| 127 | Central States O | | Oil & Gas Operator | May 1992 |
| 128 | Centrex Operating Company | Tulsa, OK 74105 | Oil & Gas Operator | Apr 2025 |
| 129 | Century Oil Mana | | Oil Operator | Apr 1987 |
| 130 | Cep Mid-Continent LLC | Skiatook, OK 74070 | Oil & Gas Operator | Apr 2025 |
| 131 | CFM 66 LLC | McPherson, KS 67460 | Oil & Gas Operator | Dec 2024 |
| 132 | CG Oil Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2011 |
| 133 | Chaco Energy Company | Denver, CO 80201 | Oil & Gas Operator | May 2025 |
| 134 | Challenger Exploration | | Oil Operator | Nov 2014 |
| 135 | Champion Petrole | | Oil Operator | Jan 1992 |
| 136 | Chance Drilling Company | Commerce City, CO 80022 | Oil Operator | Sep 2009 |
| 137 | Chaparral Energy, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Dec 2009 |
| 138 | Chaparral Energy, L.L.C. | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 139 | Chapman Energy O | | Oil & Gas Operator | Jun 1993 |
| 140 | Chapman Energy Oklahoma, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2015 |
| 141 | Chapman Explorat | | Oil Operator | Feb 1988 |
| 142 | Charter Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2025 |
| 143 | Charter Producti | | Oil & Gas Operator | Jun 1994 |
| 144 | Charter Production Company | Wichita, KS 67202 | Oil & Gas Operator | Feb 2018 |
| 145 | Chase Exploratio | | Oil Operator | Sep 1992 |
| 146 | Chase Well Servi | | Oil Operator | Jun 1989 |
| 147 | Chase Well Service, Inc. | Great Bend, KS 67530 | Oil Operator | Mar 2004 |
| 148 | Chase, Glen Drilling | Chanute, KS 66720 | Oil Operator | Jul 1996 |
| 149 | Chase, Michael | Chanute, KS 66720 | Oil Operator | Mar 1999 |
| 150 | Chautauqua Oil And Gas LLC | Tulsa, OK 74145 | Oil & Gas Operator | Jan 2025 |
| 151 | CHC III Paola Energy, LLC | | Oil Operator | Mar 2025 |
| 152 | Chenoweth, Dean | Haviland, KS 67059 | Oil Operator | Jun 1994 |
| 153 | Cherokee Basin Pipeline LLC | Mason, MI 48854 | Gas Operator | Mar 2025 |
| 154 | Cherokee Energy | | Oil & Gas Operator | Oct 1988 |
| 155 | Cherokee Oil | | Oil Operator | Mar 2025 |
| 156 | Cherokee Valley | | Oil Operator | May 1993 |
| 157 | Cherokee Wells LLC | Fredonia, KS 66736 | Oil & Gas Operator | Mar 2025 |
| 158 | Cherokeenrg LLC | Neodesha, KS 66757 | Oil & Gas Operator | Dec 2019 |
| 159 | Cherryvale Gas Co. | Cherryvale, KS 67335 | Oil Operator | Jan 2002 |
| 160 | Chesapeake Energy | | Oil & Gas Operator | Dec 2009 |
| 161 | Chesapeake Energy Ma | | Gas Operator | Jun 2016 |
| 162 | Chesapeake Energy Marketing, Inc. | | Oil & Gas Operator | Jan 2025 |
| 163 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Jul 2025 |
| 164 | Chesapeake Operating, Inc. | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 165 | Chesney Marilyn | | Oil Operator | Jul 1987 |
| 166 | Chesney Oil Comp | | Oil Operator | Sep 1989 |
| 167 | Chestnut Production Company | Towanda, KS 67144 | Oil Operator | Jan 1999 |
| 168 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 169 | Chevron USA Inc | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 170 | Chew Bill Incorp | | Oil & Gas Operator | Mar 1994 |
| 171 | Chew, Bill, Inc. | Hutchinson, KS 67502 | Oil Operator | Sep 2002 |
| 172 | Cheyenne Explora | | Oil Operator | Jun 1983 |
| 173 | Cheyenne Oil Services, Inc. | Ness City, KS 67560 | Oil Operator | Nov 2023 |
| 174 | Chief Drilling C | | Oil & Gas Operator | Feb 1995 |
| 175 | Chief Drilling Company | | Oil Operator | Jun 1985 |
| 176 | Chief Drilling, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 1997 |
| 177 | Chieftain Oil Co Inc | Kiowa, KS 67070 | Oil & Gas Operator | May 2025 |
| 178 | Chinook Energy C | | Oil Operator | Jul 1991 |
| 179 | Chipmunk'S Oil & Gas Lease Oper., Inc. | Copan, OK 74022 | Oil Operator | Dec 1996 |
| 180 | Chisholm Trail Resources, Inc. | Hennessey, OK 73742 | Oil & Gas Operator | Nov 2002 |
| 181 | Chisum Oil & Gas, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Mar 2025 |
| 182 | Chizum Oil LLC | Wichita, KS 67211 | Oil & Gas Operator | Apr 2025 |
| 183 | Cholla Production LLC | Littleton, CO 80127 | Oil & Gas Operator | Mar 2025 |
| 184 | Cholla Resources | | Oil Operator | Oct 1995 |
| 185 | Cholla Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 1997 |
| 186 | Chooch Incorpora | | Gas Operator | Dec 1994 |
| 187 | Chriestenson Oil LLC | Neosho Falls, KS 66758 | Oil Operator | Mar 2025 |
| 188 | Chris Batchman Inc. | Ellinwood, KS 67526 | Oil Operator | Mar 2025 |
| 189 | Chris Melander Drilling | | Oil Operator | Jun 2015 |
| 190 | Christa Oil Co | Cumberland, OH 43732 | Oil & Gas Operator | Nov 1999 |
| 191 | Christa Oil Comp | | Oil Operator | Nov 1994 |
| 192 | Christian Operating Company | Cypress, TX 77429 | Oil & Gas Operator | Dec 2014 |
| 193 | Cig Exploration | Denver, CO 80201 | Oil & Gas Operator | Sep 1999 |
| 194 | Cimarex Energy Co | Midland, TX 79706 | Oil & Gas Operator | Jul 2025 |
| 195 | Cinab, Inc. | FT. Scott, KS 66701 | Oil Operator | Jan 1998 |
| 196 | Cinco Exploratio | | Oil & Gas Operator | Jan 1988 |
| 197 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 198 | Circle E Oil - E | | Oil Operator | May 1990 |
| 199 | Circle K Enterprises | | Oil & Gas Operator | Jun 2024 |
| 200 | Circle T Oil | | Oil Operator | Nov 2024 |