| 1201 | Dexco, Inc. | | Oil & Gas Operator | May 1990 |
| 1202 | DGH Petroleum, Inc. | | Oil & Gas Operator | Aug 2011 |
| 1203 | Di Energy Inc. | Houston, TX 77067 | Oil & Gas Operator | Jan 2004 |
| 1204 | Diablo Oil Corp. | | Oil & Gas Operator | Apr 1989 |
| 1205 | Diamar Oil Company, Inc. | | Oil Operator | Nov 1983 |
| 1206 | Diamex Company | | Oil & Gas Operator | Oct 1982 |
| 1207 | Diamond D Operating | | Oil & Gas Operator | Apr 1995 |
| 1208 | Diamond Drilling Co. | | Oil Operator | Apr 1983 |
| 1209 | Diamond S Operating Co. | | Oil & Gas Operator | Oct 1992 |
| 1210 | Diamond Shamrock Corp | Amarillo, TX 79105 | Oil & Gas Operator | Jan 1987 |
| 1211 | Diamond Shamrock Expl. Co. | | Oil & Gas Operator | Jun 1987 |
| 1212 | Diasu Oil & Gas Co., Inc. | Houston, TX 77002 | Oil & Gas Operator | Mar 2016 |
| 1213 | Dilligas, Inc. | | Oil Operator | May 1990 |
| 1214 | Dimension Energy Co., L.L.C. | | Oil & Gas Operator | Jan 2024 |
| 1215 | Discovery Energy, LLC | | Oil Operator | Jan 2007 |
| 1216 | Discovery Operating, LLC | | Oil & Gas Operator | Oct 2023 |
| 1217 | Discus Oil Corporation | | Oil & Gas Operator | Dec 2002 |
| 1218 | Ditta Exploration Co., Inc. | | Oil & Gas Operator | Feb 1990 |
| 1219 | Diversified Energy Investments | | Oil & Gas Operator | May 2009 |
| 1220 | Diversified Natural Res., Inc. | | Oil Operator | May 2000 |
| 1221 | Diversified Production LLC | Minden, LA 71055 | Oil & Gas Operator | Apr 2024 |
| 1222 | Divine'S Service & Repairs Inc | | Oil & Gas Operator | Mar 1997 |
| 1223 | Dixie Operating Company | Spring, TX 77379 | Oil & Gas Operator | Dec 2002 |
| 1224 | Dixie Well Service, Inc. | | Oil & Gas Operator | Jul 1995 |
| 1225 | Dixon Management Corp. | | Oil & Gas Operator | May 1984 |
| 1226 | DKM Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Sep 2011 |
| 1227 | DLB Oil & Gas, Inc. | Big Lake, TX 76932 | Oil & Gas Operator | Apr 2024 |
| 1228 | DMS Oil Company | Houston, TX 77042 | Oil & Gas Operator | Feb 2024 |
| 1229 | Dna Petroleum Inc. | | Oil Operator | Dec 2004 |
| 1230 | Docherty Operating, L.L.C. | | Oil Operator | Dec 2023 |
| 1231 | Dome De Sel LLC | | Oil & Gas Operator | Dec 2023 |
| 1232 | Dome Petroleum Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2016 |
| 1233 | Domestic Energy Corporation | | Oil Operator | Jan 1988 |
| 1234 | Domestic Oil Producers,Inc. | | Oil Operator | Oct 1998 |
| 1235 | Dominion Exploration & Production Inc | Houston, TX 77060 | Oil & Gas Operator | Apr 2015 |
| 1236 | Dominion Midstream Services, LP | | Oil Operator | Dec 2006 |
| 1237 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 1238 | Don G. Wiley, Jr. | | Oil Operator | Dec 1979 |
| 1239 | Don Townes | | Oil Operator | Sep 2000 |
| 1240 | Don W. Holcomb | | Oil Operator | Feb 1996 |
| 1241 | Don Webb | | Oil Operator | Mar 1984 |
| 1242 | Donald & Danny Dews Production | | Oil Operator | Jan 2024 |
| 1243 | Donald J. Zadeck | | Oil & Gas Operator | Feb 1998 |
| 1244 | Donald Owens | | Oil & Gas Operator | Dec 2023 |
| 1245 | Donn G. Thompson, Et Al | | Oil Operator | Apr 1987 |
| 1246 | Donnie R. Morrow | | Oil Operator | Dec 2023 |
| 1247 | Donny Joe Barnhill | | Gas Operator | Dec 2023 |
| 1248 | Doran & Braddock & Nelson Petr | | Oil Operator | Feb 1982 |
| 1249 | Doran And Braddock | | Oil & Gas Operator | Nov 1984 |
| 1250 | Dorbert Oil & Gas, Inc. | | Gas Operator | Aug 1988 |
| 1251 | Dorcheat Oil & Gas, LLC | | Oil & Gas Operator | Jan 2024 |
| 1252 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 1253 | Dore-Dyn Production Co., Inc. | | Oil & Gas Operator | Jul 1993 |
| 1254 | Dorothy F. Hamlin | | Oil Operator | Dec 1985 |
| 1255 | Dorothy Oil Company | | Oil & Gas Operator | Oct 1994 |
| 1256 | Dossie Dews | | Oil & Gas Operator | Jan 2024 |
| 1257 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2024 |
| 1258 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 1259 | Douglas Edwards | | Oil Operator | Nov 1993 |
| 1260 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 1261 | Dow Intrastate Gas Company | | Oil Operator | Nov 2023 |
| 1262 | Dow Mineral & Royalty Co, Inc | | Oil & Gas Operator | Jun 1994 |
| 1263 | Doyle Dempsey | | Oil Operator | May 1997 |
| 1264 | Dragon Energy Corporation | | Oil & Gas Operator | Nov 2006 |
| 1265 | Drake Energy Corporation | | Gas Operator | Dec 2023 |
| 1266 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 1267 | Drew Cornell, Inc. | | Oil & Gas Operator | Jul 1992 |
| 1268 | Drew Cornell, Inc.-Agent | | Oil & Gas Operator | Sep 1990 |
| 1269 | Drew Cornell,Inc.-C.H.Lawrence | | Oil & Gas Operator | Sep 1990 |
| 1270 | Drew Cornell,Inc.-R Waterbury | | Oil Operator | Jun 1999 |
| 1271 | DRG Energy Inc | Norman, OK 73026-3171 | Oil & Gas Operator | Nov 2023 |
| 1272 | Drilling, Operg & Explor, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1273 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 1274 | Drillmar Operating Company | Houston, TX 77019 | Oil & Gas Operator | Jun 2013 |
| 1275 | Drmas, LLC | | Oil & Gas Operator | Nov 2023 |
| 1276 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 1277 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 1278 | Dubach Gas Company | | Oil Operator | May 2003 |
| 1279 | Ducharme Oil, LLC | | Oil & Gas Operator | Nov 2023 |
| 1280 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 1281 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 1282 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 1283 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 1284 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 1285 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 1286 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 1287 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 1288 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 1289 | Dunhill Expl. & Prod., LLC | | Oil & Gas Operator | Nov 2004 |
| 1290 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 1291 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jan 2024 |
| 1292 | Dupont Oil Company | | Oil Operator | Feb 1998 |
| 1293 | Dupree And Dupree | | Oil Operator | Dec 1998 |
| 1294 | Dvi | | Oil Operator | Dec 2008 |
| 1295 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1296 | Dykes Oil Co. | | Oil Operator | Dec 2001 |
| 1297 | Dynaco, Incorporated | | Oil & Gas Operator | Dec 1980 |
| 1298 | Dynamic Exploration PTRS, LLC | | Oil & Gas Operator | Jan 2024 |
| 1299 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 1300 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Apr 2024 |