| 101 | Cla-Mar Oil Company, LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 102 | Clair Oil, Inc. | Russell, KS 67665 | Oil Operator | Nov 2019 |
| 103 | Clinton Producti | | Oil Operator | Dec 1989 |
| 104 | Coastal Oil & Ga | | Oil & Gas Operator | Oct 1996 |
| 105 | Cobalt Energy LLC | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 106 | Cokan Resources | Colby, KS 67701 | Oil Operator | Aug 1994 |
| 107 | Col-Kan Developm | | Oil & Gas Operator | Jan 1995 |
| 108 | Collins John B | | Oil Operator | Sep 1994 |
| 109 | Colorado Crude E | | Oil Operator | Jan 1986 |
| 110 | Colt Resources Corporation | Billings, MT 59103 | Oil & Gas Operator | Feb 2013 |
| 111 | Columbian Servic | | Oil & Gas Operator | Nov 1993 |
| 112 | Condor Energy | | Oil Operator | Aug 1995 |
| 113 | Consolidated Oil & Gas Inc | Wichita, KS 67202 | Oil & Gas Operator | Dec 2012 |
| 114 | Continental Ener | | Oil & Gas Operator | Dec 1996 |
| 115 | Continental Operating Co. | Houston, TX 77024 | Oil & Gas Operator | Jul 2025 |
| 116 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Apr 2025 |
| 117 | Corie Oil Compan | | Oil Operator | Jul 1985 |
| 118 | Crazy Horse Oil | | Oil Operator | Jan 2025 |
| 119 | Curt'S Oil Operation, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Mar 2025 |
| 120 | CWB Oil Company, LLC | St. Francis, KS 67756 | Oil Operator | Mar 2025 |
| 121 | D & G Oil Compan | | Oil Operator | Mar 1988 |
| 122 | D Oil, Inc. | Victoria, KS 67671 | Oil Operator | Mar 2025 |
| 123 | D-Oil Incorporat | | Oil Operator | Aug 1990 |
| 124 | D. R. Lauck Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jul 2019 |
| 125 | Damar Resc Incor | | Oil Operator | Oct 1995 |
| 126 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Oct 2023 |
| 127 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Jul 2025 |
| 128 | Davis Petroleum, Inc. | Great Bend, KS 67530 | Oil Operator | Aug 2021 |
| 129 | Daystar Petroleum, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Mar 2025 |
| 130 | Dechant Oil Operations, LLC | Hutchinson, KS 67501 | Oil Operator | Jan 2025 |
| 131 | Delta Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2024 |
| 132 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 133 | Deutsch Oil Company | | Oil & Gas Operator | Mar 2025 |
| 134 | Deutscher Oil Operations | | Oil Operator | Feb 2025 |
| 135 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Apr 2025 |
| 136 | DGH Oil, LLC | Logan, KS 67646 | Oil Operator | Mar 2025 |
| 137 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Mar 2025 |
| 138 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 139 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 140 | Don Karst Well Service, Inc. | Russell, KS 67665 | Oil Operator | Mar 2025 |
| 141 | Double D'S LLC | Hays, KS 67601 | Oil Operator | Mar 2025 |
| 142 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Mar 2025 |
| 143 | Downing-Nelson Oil Co Inc | Hays, KS 67601 | Oil & Gas Operator | Mar 2025 |
| 144 | Dreiling Limited | | Oil Operator | Jun 1984 |
| 145 | Dreiling Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2018 |
| 146 | Dreiling Resourc | | Oil Operator | Oct 1996 |
| 147 | Dreiling Resources Inc. | Victoria, KS 67671 | Oil Operator | Sep 1997 |
| 148 | Dunne-Gardner Pe | | Oil & Gas Operator | Nov 1992 |
| 149 | E & B Natural Resources Management Corporation | Hays, KS 67601 | Oil & Gas Operator | May 2025 |
| 150 | E S P Developmne | | Oil Operator | Oct 1993 |
| 151 | Eagle Oil Compan | | Oil Operator | Jul 1990 |
| 152 | Eagle Petroleum, Inc. | Ellinwood, KS 67526 | Oil Operator | Mar 2025 |
| 153 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Apr 2025 |
| 154 | Ecco | | Oil Operator | Mar 2025 |
| 155 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 156 | Edmiston Oil Com | | Oil & Gas Operator | May 1994 |
| 157 | Edmiston Oil Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 158 | Eleven Eleven Investments, LLC | Hays, KS 67601 | Oil Operator | Feb 2025 |
| 159 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Mar 2025 |
| 160 | Elmer L. Karst Oil, A General Partnership | Russell, KS 67665 | Oil Operator | Mar 2025 |
| 161 | Empire Energy E & P LLC | Mayville, NY 14757 | Oil & Gas Operator | Dec 2024 |
| 162 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Feb 2025 |
| 163 | Energy Explorati | | Oil & Gas Operator | Oct 1993 |
| 164 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 165 | Engel Investments LLC | Hays, KS 67601 | Oil Operator | Oct 2024 |
| 166 | Enterprise Inc | Hays, KS 67601 | Oil Operator | Sep 2015 |
| 167 | Equinox Oil Company | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 168 | Erbert Don Oil C | | Oil Operator | May 1993 |
| 169 | Erbert, Harold | Iola, KS 66749 | Oil Operator | Dec 1992 |
| 170 | Ernst & Steinle | | Oil Operator | Oct 1991 |
| 171 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Mar 2025 |
| 172 | Euram Petroleum | | Oil Operator | Apr 1986 |
| 173 | F & M Oil Compan | | Oil & Gas Operator | Feb 1993 |
| 174 | Fairchild, Bob | Kingman, KS 67068 | Oil Operator | Jan 2001 |
| 175 | Falcon Explorati | | Oil & Gas Operator | Apr 1995 |
| 176 | Farmer, John O., Inc. | Russell, KS 67665 | Oil & Gas Operator | Mar 2025 |
| 177 | Fell Oil & Gas C | | Oil Operator | Oct 1991 |
| 178 | Fina Oil & Chemi | | Oil & Gas Operator | Oct 1995 |
| 179 | Fossil Energy, LLC | Russell, KS 67665 | Oil Operator | Mar 2025 |
| 180 | Froelich Oil | | Oil Operator | Apr 2010 |
| 181 | Frontier Oil Com | | Oil & Gas Operator | May 1995 |
| 182 | G & C Oil | | Oil Operator | Feb 2025 |
| 183 | G & J Petroleum, Inc. | McCracken, KS 67556 | Oil Operator | Mar 2025 |
| 184 | G L M Company | | Oil Operator | Mar 2025 |
| 185 | Galloway Drillin | | Oil Operator | Dec 1996 |
| 186 | Galloway Drilling Co., Inc. | Wichita, KS 67202 | Oil Operator | Nov 2009 |
| 187 | Geist Oil Operations | | Oil Operator | Mar 2025 |
| 188 | Gene Karlin Company | | Oil Operator | Nov 2015 |
| 189 | Geodessa Corpora | | Oil Operator | Jul 1984 |
| 190 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 191 | Giebler Oil Comp | | Oil Operator | Aug 1991 |
| 192 | Ginther Oil, Inc. | Russell, KS 67665 | Oil Operator | Nov 2019 |
| 193 | Gore Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Mar 2025 |
| 194 | Grady Bolding Corporation | Ellinwood, KS 67526 | Oil & Gas Operator | Mar 2025 |
| 195 | Graham-Michaelis | | Oil & Gas Operator | Nov 1996 |
| 196 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 197 | Grand Mesa Operating Co | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 198 | Graves Drilling Co., Inc. | Wichita, KS 67208 | Oil & Gas Operator | Mar 2025 |
| 199 | Great Eastern Energy & Dev. Corp. | Midland, TX 79701 | Oil & Gas Operator | Jul 2008 |
| 200 | Green J R & Jerr | | Oil Operator | Dec 1991 |