| 101 | Chapman Energy O | | Oil & Gas Operator | Jun 1993 |
| 102 | Chapman Explorat | | Oil Operator | Feb 1988 |
| 103 | Charter Energy, Inc. | Great Bend, KS 67530 | Oil Operator | Jun 2025 |
| 104 | Chesapeake Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Oct 2025 |
| 105 | Chevron U S A In | | Oil & Gas Operator | Sep 2000 |
| 106 | Cheyenne Explora | | Oil Operator | Jun 1983 |
| 107 | Chief Drilling C | | Oil & Gas Operator | Feb 1995 |
| 108 | Chris Batchman Inc. | Ellinwood, KS 67526 | Oil Operator | Jun 2025 |
| 109 | Cincris Energy C | | Oil & Gas Operator | Jun 1991 |
| 110 | Citation Oil & Gas Corp. | Houston, TX 77269 | Oil & Gas Operator | Oct 2025 |
| 111 | Cla-Mar Oil Company, LLC | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 112 | Classic Well Service, Inc. | Claflin, KS 67525 | Oil Operator | Dec 2019 |
| 113 | Clover Oil Company | | Oil Operator | May 2025 |
| 114 | CMX, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 115 | CNG Producing | New Orleans, LA 70112-6000 | Oil & Gas Operator | Jun 2000 |
| 116 | Col-Kan Developm | | Oil & Gas Operator | Jan 1995 |
| 117 | Collins Oil, LLC | Ellinwood, KS 67526 | Oil Operator | Jun 2025 |
| 118 | Colorado Crude E | | Oil Operator | Jan 1986 |
| 119 | Columbian Servic | | Oil & Gas Operator | Nov 1993 |
| 120 | Condor Energy Inc | Great Bend, KS 67530 | Oil & Gas Operator | Oct 2021 |
| 121 | Connell, Mark Allen | Claflin, KS 67525 | Oil Operator | Jun 2025 |
| 122 | Conrade Patsy | | Oil Operator | Jan 1986 |
| 123 | Consolidated Oil | | Oil Operator | Jul 1996 |
| 124 | Continental Brok | | Oil Operator | Oct 1994 |
| 125 | Coral Production Corporation | Denver, CO 80201 | Oil & Gas Operator | Jun 2025 |
| 126 | Craig Oil Company | | Oil Operator | Dec 2019 |
| 127 | Criger Oil Compa | | Oil Operator | Sep 1992 |
| 128 | Curt'S Oil Opera | | Oil Operator | Nov 1994 |
| 129 | Curt'S Oil Operation, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Jun 2025 |
| 130 | D J Oil Operations | | Oil Operator | Dec 2009 |
| 131 | D S & W Well Ser | | Oil Operator | Nov 1996 |
| 132 | D S & W Well Servicing, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2019 |
| 133 | D. R. Lauck Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jul 2019 |
| 134 | Damar Resources, Inc. | Hays, KS 67601 | Oil & Gas Operator | Apr 2025 |
| 135 | Darrah John J Jr | | Oil & Gas Operator | Oct 1994 |
| 136 | Darrah John Jay Jr | Wichita, KS 67201 | Oil & Gas Operator | Aug 2025 |
| 137 | Darrah Oil Company LLC | Wichita, KS 67201 | Oil & Gas Operator | Oct 2025 |
| 138 | Davis Oil Compan | | Oil Operator | Jul 1988 |
| 139 | Davis Petroleum | | Oil & Gas Operator | Dec 1996 |
| 140 | Davis Petroleum, Inc. | Great Bend, KS 67530 | Oil Operator | Aug 2021 |
| 141 | Daystar Petroleum, Inc. | Eureka, KS 67045 | Oil & Gas Operator | Jun 2025 |
| 142 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 143 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Apr 2025 |
| 144 | Deutsch Oil Company | | Oil & Gas Operator | Jun 2025 |
| 145 | Dexxon, Inc. | Kiefer, OK 74041 | Oil & Gas Operator | Jun 2025 |
| 146 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |
| 147 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Jun 2025 |
| 148 | Doonan & Sons In | | Oil Operator | Apr 1995 |
| 149 | Doonan And Sons, Inc. | Great Bend, KS 67530 | Oil Operator | Apr 2021 |
| 150 | Double 'B' Oil Co | | Oil Operator | Nov 2009 |
| 151 | Double 'B' Oil I | | Oil Operator | Feb 1992 |
| 152 | Double Eagle Exp | | Oil Operator | Jul 1992 |
| 153 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Jun 2025 |
| 154 | Double L Oil Producers | | Oil Operator | Dec 2019 |
| 155 | Drake Exploration LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Jun 2025 |
| 156 | Driftwood Oil Co. | Russell, KS 67665 | Oil Operator | Jan 1988 |
| 157 | Dunne Equities I | | Oil & Gas Operator | Dec 1995 |
| 158 | E & B Natural Resources Management Corporation | Hays, KS 67601 | Oil & Gas Operator | Aug 2025 |
| 159 | Eagle Oil Compan | | Oil Operator | Jul 1990 |
| 160 | Eagle Petroleum | | Oil & Gas Operator | Nov 1995 |
| 161 | Eagle Petroleum, Inc. | Ellinwood, KS 67526 | Oil Operator | Jun 2025 |
| 162 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Jun 2025 |
| 163 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Jun 2025 |
| 164 | Edmiston Oil Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Jun 2025 |
| 165 | Elendil Resources LLC | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 166 | Ellinwood Oil Reclaiming Inc | | Oil Operator | Oct 2009 |
| 167 | Ellinwood Tank Service, Inc. | Chase, KS 67524 | Oil Operator | Jul 2022 |
| 168 | Elmer L. Karst Oil, A General Partnership | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 169 | Elysium Energy, L.L.C. | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 170 | Empire Energy E&P, LLC | Mayville, NY 14757 | Oil & Gas Operator | Mar 2019 |
| 171 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2019 |
| 172 | Energy Explorati | | Oil & Gas Operator | Oct 1993 |
| 173 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 174 | Energy Three, Inc. | Jackson, MS 39211 | Oil & Gas Operator | Jun 2025 |
| 175 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Jun 2025 |
| 176 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 2025 |
| 177 | Evans John Roy | | Oil Operator | Nov 1992 |
| 178 | Evans Oil D W - | | Oil Operator | Mar 1992 |
| 179 | Evans Oil Inc. | Lebo, KS 66856 | Oil Operator | Jun 2025 |
| 180 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |
| 181 | F & M Oil Compan | | Oil & Gas Operator | Feb 1993 |
| 182 | F.G. Holl Co., LLC | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 183 | Falcon Energy Co | | Oil Operator | Apr 1992 |
| 184 | Farmer, John O., Inc. | Russell, KS 67665 | Oil & Gas Operator | Jun 2025 |
| 185 | Farris Well Service | | Oil & Gas Operator | Dec 2021 |
| 186 | Fell Oil & Gas C | | Oil Operator | Oct 1991 |
| 187 | Ferris, Wakyn W. | Denver, CO 80202 | Oil Operator | Jun 1988 |
| 188 | Fina Oil & Chemi | | Oil & Gas Operator | Oct 1995 |
| 189 | Folk Oil | | Oil Operator | Dec 2009 |
| 190 | Forestar Petroleum Corporation | Denver, CO 80202 | Oil & Gas Operator | May 2017 |
| 191 | Formation Mechan | | Oil Operator | Dec 1986 |
| 192 | Fossil Energy, LLC | Russell, KS 67665 | Oil Operator | Jun 2025 |
| 193 | Four-Way Oper In | | Oil Operator | Aug 1994 |
| 194 | Four-Way Operating, Inc. | Great Bend, KS 67530 | Oil Operator | Sep 2013 |
| 195 | Fox, Don | Chase, KS 67524 | Oil & Gas Operator | Jul 2006 |
| 196 | Fritzler Trucking, Inc. | Ness City, KS 67560 | Oil Operator | Sep 2007 |
| 197 | Frontier Oil Com | | Oil & Gas Operator | May 1995 |
| 198 | Frontier Oil Company | | Oil Operator | Oct 1999 |
| 199 | Funk Oil & Operating, LLC | Russell, KS 67665 | Oil Operator | Jul 2024 |
| 200 | Future Energy Li | | Oil Operator | Nov 1991 |