| 1201 | Deltex Petroleum | | Oil Operator | Nov 1994 |
| 1202 | Denchfield, Fred | Neal, KS 66863 | Oil Operator | Dec 1997 |
| 1203 | Denis Roberts Oil | | Oil Operator | Sep 2025 |
| 1204 | Denman J M Oil C | | Oil Operator | Mar 1994 |
| 1205 | Denmark Oil | Wichita, KS 67212 | Oil & Gas Operator | May 2000 |
| 1206 | Dennis Fitzpatrick Rev. Trust | Sterling, KS 67579 | Gas Operator | Sep 2025 |
| 1207 | Denny, Arthur Gene | Independence, KS 67301 | Oil Operator | Oct 1996 |
| 1208 | Denova | | Oil Operator | Jan 1989 |
| 1209 | Dernick Resources Inc | Dallas, TX 75204 | Oil & Gas Operator | Jan 2002 |
| 1210 | Derrick Petroleu | | Oil Operator | Sep 1994 |
| 1211 | Derrick Resources Inc | Henryetta, OK 74437-4249 | Oil & Gas Operator | Nov 2025 |
| 1212 | Derrick-Amer Oil | | Oil Operator | Dec 1991 |
| 1213 | Deshal Energy LLC | Oklahoma City, OK 73170 | Oil Operator | Aug 2025 |
| 1214 | Destiny Petroleum LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2024 |
| 1215 | Destiny Services LLC | Pratt, KS 67124 | Oil & Gas Operator | Jan 2024 |
| 1216 | Deutsch Oil Comp | | Oil & Gas Operator | Oct 1994 |
| 1217 | Deutsch Oil Company | | Oil & Gas Operator | Sep 2025 |
| 1218 | Deutscher Oil Operations | | Oil Operator | Jun 2025 |
| 1219 | Development Ener | | Oil Operator | Dec 1994 |
| 1220 | Devon Energy Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Dec 2009 |
| 1221 | Devon Energy Production Company, L.P. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1222 | Devonian Oil Com | | Oil Operator | Dec 1996 |
| 1223 | Devonian Oil Company | Lawrence, KS 66044 | Oil Operator | May 2001 |
| 1224 | Dewayne'S Tank Service, Inc. | Saint John, KS 67576 | Oil Operator | Nov 2000 |
| 1225 | Dexxon Inc | Kiefer, OK 74041 | Oil & Gas Operator | Nov 2025 |
| 1226 | DGH Oil, LLC | Logan, KS 67646 | Oil Operator | Sep 2025 |
| 1227 | DHP Investments, LTD. | Tyler, TX 75703 | Oil Operator | Sep 2025 |
| 1228 | Diamond B Indust | | Oil Operator | Nov 1996 |
| 1229 | Diamond B Miami Flood, LTD. | Paola, KS 66071 | Oil Operator | Sep 2025 |
| 1230 | Diamond Chemical | | Oil & Gas Operator | Jan 1995 |
| 1231 | Diamond Chemicals Company | Amarillo, TX 79101 | Gas Operator | Jul 2001 |
| 1232 | Diamond Dixie Ex | | Oil Operator | Jul 1985 |
| 1233 | Diamond Star Oil, Inc. | Lacygne, KS 66040 | Oil Operator | Dec 2019 |
| 1234 | Diehl Glenn D Oi | | Oil Operator | Jul 1993 |
| 1235 | Diehl Oil Inc | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1236 | Dieter Prod Comp | | Oil & Gas Operator | Feb 1991 |
| 1237 | Dieter Production Company | Durham, KS 67438 | Gas Operator | Mar 2013 |
| 1238 | Dietrich Oil Co., A General Partnership | Humboldt, KS 66748 | Oil Operator | Jul 2000 |
| 1239 | Dietrich Petrole | | Gas Operator | Dec 1986 |
| 1240 | Dilley, W.R. & A'Meta I. | Sedan, KS 67361 | Oil Operator | Nov 2015 |
| 1241 | Dimick Production, LLC | Hamilton, KS 66853 | Oil Operator | Sep 2025 |
| 1242 | Directional Drilling Systems, LLC | Greenwood VIllage, CO 80111 | Oil Operator | Dec 2019 |
| 1243 | Discovery Natural Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Feb 2026 |
| 1244 | Discovery Operat | | Gas Operator | Jul 1988 |
| 1245 | Diversified Operating Corp. | Golden, CO 80401 | Oil & Gas Operator | Oct 2012 |
| 1246 | Dixie Oil Incorp | | Oil Operator | Jul 1992 |
| 1247 | Dixie Oil, LLC | Hamilton, KS 66853 | Oil Operator | Aug 2025 |
| 1248 | Dixon Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Sep 2023 |
| 1249 | Dixon Oil Compan | | Oil Operator | Apr 1994 |
| 1250 | Dixon Operating Company, LLC | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 1251 | Dixon, Margaret | Moline, KS 67353 | Oil Operator | Dec 2009 |
| 1252 | Dixon, Mike | Moline, KS 67353 | Oil Operator | Sep 2025 |
| 1253 | Dixon, Robin Francine | Moline, KS 67353 | Oil Operator | Sep 2025 |
| 1254 | DK Operating Inc. | Jetmore, KS 67854 | Oil Operator | Sep 2025 |
| 1255 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 1256 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Feb 2026 |
| 1257 | DLM Oil | | Oil Operator | Nov 2008 |
| 1258 | DMH Petroleum, Inc. | Sterling, KS 67579 | Oil Operator | Aug 2025 |
| 1259 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 1260 | DNB Drilling, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2001 |
| 1261 | DNR Oil And Gas, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2025 |
| 1262 | Dobrinski, Mark E., A General Partnership | Coldwater, KS 67029 | Oil Operator | Feb 2008 |
| 1263 | Docking Developm | | Oil & Gas Operator | Dec 1996 |
| 1264 | Docking Development Company, LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Oct 2013 |
| 1265 | Dolphin Energy LLC | Lake Worth, FL 33467 | Oil & Gas Operator | Sep 2025 |
| 1266 | Domar Oil & Gas | | Gas Operator | May 1995 |
| 1267 | Domar Oil & Gas Inc | Liberal, KS 67905 | Oil & Gas Operator | Oct 2000 |
| 1268 | Dominion Oil & Gas Corporation | Irving, TX 75039 | Oil & Gas Operator | Jun 2012 |
| 1269 | Dominion Oklahoma Texas Expl & Prod Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Aug 2013 |
| 1270 | Don Erbert Oil Company | | Oil Operator | Oct 2013 |
| 1271 | Don Karst Well Service, Inc. | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 1272 | Don Sims Oil | | Oil Operator | Sep 2025 |
| 1273 | Donald C. Slawson | | Oil Operator | Jun 1985 |
| 1274 | Donke Oil & Gas, LLC | Tulsa, OK 74137 | Oil & Gas Operator | Mar 2018 |
| 1275 | Donna Lee Oil Co | Independence, KS 67301 | Oil & Gas Operator | Apr 2014 |
| 1276 | Doodlebug Oil Co | | Oil Operator | Jun 2006 |
| 1277 | Doonan & Sons In | | Oil Operator | Apr 1995 |
| 1278 | Doonan And Sons, Inc. | Great Bend, KS 67530 | Oil Operator | Apr 2021 |
| 1279 | Dorado E & P Partners LLC | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2025 |
| 1280 | Dorado Gas Resources LLC | Centennial, CO 80112 | Oil & Gas Operator | Jul 2009 |
| 1281 | Doralex Energy I | | Oil & Gas Operator | Feb 1995 |
| 1282 | Doralex Energy, Inc. | San Angelo, TX 76904 | Oil Operator | Feb 2000 |
| 1283 | Dorchester Explo | | Oil & Gas Operator | Dec 1984 |
| 1284 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 1285 | Dorchester Hugot | | Gas Operator | Sep 1993 |
| 1286 | Dorchester Minerals Operating LP | Dallas, TX 75219 | Oil & Gas Operator | Jun 2022 |
| 1287 | Dotson, Floyd | | Oil Operator | Dec 1980 |
| 1288 | Doty, Tim | Sedan, KS 67361 | Oil Operator | Dec 2009 |
| 1289 | Double "K" Oil, Inc. | Ellis, KS 67637 | Oil Operator | Dec 2019 |
| 1290 | Double 'B' Oil Co | | Oil Operator | Nov 2009 |
| 1291 | Double 'B' Oil I | | Oil Operator | Feb 1992 |
| 1292 | Double 'E' Oil-B | | Oil Operator | Mar 1989 |
| 1293 | Double 7 Oil And Gas LLC | Parsons, KS 67357 | Oil & Gas Operator | Sep 2009 |
| 1294 | Double D Oil Co | Winfield, KS 67156 | Oil Operator | Sep 2025 |
| 1295 | Double D'S LLC | Hays, KS 67601 | Oil Operator | Sep 2025 |
| 1296 | Double Eagle Exp | | Oil Operator | Jul 1992 |
| 1297 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Sep 2025 |
| 1298 | Double Eagle Resources, LLC | FT Smith, AR 72901 | Oil & Gas Operator | Sep 2009 |
| 1299 | Double F Oil Co. | | Oil Operator | Jun 2009 |
| 1300 | Double G Petro LLC | | Oil Operator | Sep 2025 |