| 101 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 102 | Derrick Petroleu | | Oil Operator | Sep 1994 |
| 103 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Jan 2026 |
| 104 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 105 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Nov 2025 |
| 106 | Destiny Petroleum LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 107 | Destiny Services LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 108 | Deutsch Oil Comp | | Oil & Gas Operator | Oct 1994 |
| 109 | Deutsch Oil Company | | Oil & Gas Operator | Dec 2025 |
| 110 | Deutscher Oil Operations | | Oil Operator | Nov 2025 |
| 111 | Development Ener | | Oil Operator | Dec 1994 |
| 112 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 113 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2026 |
| 114 | Devonian Oil Com | | Oil Operator | Dec 1996 |
| 115 | Devonian Oil Company | Lawrence, KS 66044 | Oil Operator | May 2001 |
| 116 | Dewayne'S Tank Service, Inc. | Saint John, KS 67576 | Oil Operator | Nov 2000 |
| 117 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Feb 2026 |
| 118 | DGH Oil, LLC | Logan, KS 67646 | Oil Operator | Dec 2025 |
| 119 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Dec 2025 |
| 120 | Diamond B Indust | | Oil Operator | Nov 1996 |
| 121 | Diamond B Miami Flood, LTD. | Paola, KS 66071 | Oil Operator | Dec 2025 |
| 122 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 123 | Diamond Dixie Ex | | Oil Operator | Jul 1985 |
| 124 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 125 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 126 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 127 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 128 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 129 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 130 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 131 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Dec 2025 |
| 132 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 133 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2026 |
| 134 | Discovery Operat | | Gas Operator | Jul 1988 |
| 135 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 136 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |
| 137 | Dixie Oil, LLC | Hamilton, KS 66853 | Oil Operator | Nov 2025 |
| 138 | Dixon Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2023 |
| 139 | Dixon Oil Compan | | Oil Operator | Apr 1994 |
| 140 | Dixon Operating Company, LLC | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 141 | Dixon, Margaret | Moline, KS 67353 | Oil Operator | Dec 2009 |
| 142 | Dixon, Mike | Moline, KS 67353 | Oil Operator | Dec 2025 |
| 143 | Dixon, Robin Francine | Moline, KS 67353 | Oil Operator | Dec 2025 |
| 144 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Nov 2025 |
| 145 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 146 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2026 |
| 147 | DLM Oil | | Oil Operator | Nov 2008 |
| 148 | DMH Petroleum, Inc. | Sterling, KS 67579 | Oil Operator | Nov 2025 |
| 149 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Jan 2026 |
| 150 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 151 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Feb 2026 |
| 152 | Dobrinski, Mark E., A General Partnership | Coldwater, KS 67029 | Oil Operator | Feb 2008 |
| 153 | Docking Developm | | Oil & Gas Operator | Dec 1996 |
| 154 | Docking Development Company, LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Oct 2013 |
| 155 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Dec 2025 |
| 156 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 157 | Domar Oil & Gas Inc | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 158 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 159 | Don Erbert Oil Company | | Oil Operator | Oct 2013 |
| 160 | Don Karst Well Service, Inc. | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 161 | Don Sims Oil | | Oil Operator | Dec 2025 |
| 162 | Donald C. Slawson | | Oil Operator | Jun 1985 |
| 163 | Donke Oil & Gas, LLC | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2018 |
| 164 | Donna Lee Oil Co | Independence, KS 67301 | Oil & Gas Operator | Apr 2014 |
| 165 | Doodlebug Oil Co | | Oil Operator | Jun 2006 |
| 166 | Doonan & Sons In | | Oil Operator | Apr 1995 |
| 167 | Doonan And Sons, Inc. | Great Bend, KS 67530 | Oil Operator | Apr 2021 |
| 168 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2026 |
| 169 | Dorado Gas Resources LLC | Centennial, CO 80112 | Oil & Gas Operator | Jul 2009 |
| 170 | Doralex Energy I | | Oil & Gas Operator | Feb 1995 |
| 171 | Doralex Energy, Inc. | San Angelo, TX 76904 | Oil Operator | Feb 2000 |
| 172 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 173 | Dorchester Hugot | | Gas Operator | Sep 1993 |
| 174 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 175 | Dotson, Floyd | | Oil Operator | Dec 1980 |
| 176 | Doty, Tim | Sedan, KS 67361 | Oil Operator | Dec 2009 |
| 177 | Double "K" Oil, Inc. | Ellis, KS 67637 | Oil Operator | Dec 2019 |
| 178 | Double 'B' Oil Co | | Oil Operator | Nov 2009 |
| 179 | Double 'B' Oil I | | Oil Operator | Feb 1992 |
| 180 | Double 'E' Oil-B | | Oil Operator | Mar 1989 |
| 181 | Double D Oil Co | Winfield, KS 67156 | Oil Operator | Dec 2025 |
| 182 | Double D'S LLC | Hays, KS 67601 | Oil Operator | Nov 2025 |
| 183 | Double Eagle Exp | | Oil Operator | Jul 1992 |
| 184 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Dec 2025 |
| 185 | Double Eagle Resources, LLC | FT Smith, AR 72901 | Oil & Gas Operator | Sep 2009 |
| 186 | Double F Oil Co. | | Oil Operator | Jun 2009 |
| 187 | Double G Petro LLC | | Oil Operator | Dec 2025 |
| 188 | Double L Drilling | Yates Center, KS 66783 | Oil Operator | Jun 2000 |
| 189 | Double L Oil Producers | | Oil Operator | Dec 2019 |
| 190 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 191 | Double Ten Petro | | Oil Operator | Jul 1994 |
| 192 | Doudna, Mark A. | Osawatomie, KS 66064 | Oil Operator | Nov 2009 |
| 193 | Doug'S Pumping Service | | Oil Operator | Nov 2025 |
| 194 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2025 |
| 195 | Downing-Nelson Oil Co Inc | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 196 | DR Well Operator | | Oil Operator | Jan 1990 |
| 197 | Drake Exploration LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Feb 2026 |
| 198 | Dreiling Exploration LLC | Victoria, KS 67671 | Oil Operator | Mar 2018 |
| 199 | Dreiling Limited | | Oil Operator | Jun 1984 |
| 200 | Dreiling Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2018 |