| 1201 | Dorondoco Operating Co., Inc. | Brownwood, TX 76801 | Oil & Gas Operator | May 1994 |
| 1202 | Dorothy Boyce | Artesia, NM 88210 | Oil & Gas Operator | Sep 2000 |
| 1203 | Dorothy F. Hamlin | | Oil Operator | Dec 1985 |
| 1204 | Dorothy Oil Company | | Oil & Gas Operator | Oct 1994 |
| 1205 | Dorough, Lee Operations | Orlando, FL 32801 | Oil & Gas Operator | Apr 2025 |
| 1206 | Dorr, John R. | Pecos, TX 79772 | Oil & Gas Operator | Apr 2025 |
| 1207 | Dorsey Oil & Gas LLC | Nashport, OH 43830 | Oil & Gas Operator | Dec 2023 |
| 1208 | Dorso Energy | Wexford, PA 15090 | Oil & Gas Operator | Dec 2004 |
| 1209 | Dorso LLC | Wexford, PA 15090-8758 | Oil & Gas Operator | Dec 2005 |
| 1210 | Dorso LP | Wexford, PA 15090-8314 | Oil & Gas Operator | Dec 2024 |
| 1211 | Dorward Energy Corporation | Saint Petersburg, FL 33701-3255 | Oil & Gas Operator | Dec 2024 |
| 1212 | Dos Cicadas | Miles, TX 76861 | Oil & Gas Operator | Apr 2025 |
| 1213 | Dos Lobos Oil Co. | | Oil Operator | Dec 1999 |
| 1214 | Dos Rios Inc. | | Gas Operator | Dec 2024 |
| 1215 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 1216 | Dotson Floyd | | Oil Operator | Dec 1980 |
| 1217 | Dotson Jack M Operating Co | Norman, OK 73072-6649 | Oil Operator | Oct 1993 |
| 1218 | Dotson, Robert M | | Oil Operator | Dec 2020 |
| 1219 | Doty, Tim | Sedan, KS 67361 | Oil Operator | Dec 2009 |
| 1220 | Double "C" Energy | Coweta, OK 74429 | Oil & Gas Operator | Mar 2015 |
| 1221 | Double "D" Oil Company, Inc. | Winfield, KS 67156 | Oil Operator | Dec 2024 |
| 1222 | Double "K" Oil, Inc. | Ellis, KS 67637 | Oil Operator | Dec 2019 |
| 1223 | Double 'B' Oil Co | | Oil Operator | Nov 2009 |
| 1224 | Double 'B' Oil I | | Oil Operator | Feb 1992 |
| 1225 | Double 'E' Oil-B | | Oil Operator | Mar 1989 |
| 1226 | Double 7 Oil And Gas LLC | Parsons, KS 67357 | Oil & Gas Operator | Sep 2009 |
| 1227 | Double Aa Oil, L.L.C. | | Oil Operator | Aug 2023 |
| 1228 | Double Aa S LLC | Mayport, PA 16240-5638 | Oil & Gas Operator | Dec 2019 |
| 1229 | Double Barrel Oil Co. | | Oil Operator | Dec 1978 |
| 1230 | Double Barrel Oil LLC | Brenham, TX 77834 | Oil & Gas Operator | Apr 2025 |
| 1231 | Double Barrel Operating Limited Liability Company | Wichita Falls, TX 76308 | Oil Operator | Apr 2025 |
| 1232 | Double C Oil & Gas LLC | Jenks, OK 74037-6946 | Oil Operator | Jan 2025 |
| 1233 | Double C Operating LLC | Abilene, TX 79602 | Oil Operator | Apr 2025 |
| 1234 | Double D Producers, Inc | Edmonton, KY 42129 | Oil Operator | Dec 2023 |
| 1235 | Double D'S LLC | Hays, KS 67601 | Oil Operator | Dec 2024 |
| 1236 | Double Diamond Energy Corp. | Granbury, TX 76048 | Gas Operator | Apr 2013 |
| 1237 | Double Diamond Petroleum, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 1238 | Double E Oil & Gas, L. P. | Electra, TX 76360 | Oil & Gas Operator | Apr 2025 |
| 1239 | Double Eagle Exp | | Oil Operator | Jul 1992 |
| 1240 | Double Eagle Exploration Inc | Windthorst, TX 76389 | Oil Operator | Dec 2024 |
| 1241 | Double Eagle Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Jan 2000 |
| 1242 | Double Eagle Oil Co. | Marshall, TX 75670 | Oil & Gas Operator | Jan 2002 |
| 1243 | Double Eagle Operating, LLC | Fort Worth, TX 76113 | Oil & Gas Operator | Apr 2025 |
| 1244 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Apr 2025 |
| 1245 | Double Eagle Resources, LLC | FT Smith, AR 72901 | Oil & Gas Operator | Sep 2009 |
| 1246 | Double Eight Oil Company LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Apr 2025 |
| 1247 | Double F Oil Co. | | Oil Operator | Jun 2009 |
| 1248 | Double G Oil LLC | Bartlesville, OK 74003 | Oil Operator | Jan 2025 |
| 1249 | Double G Petro LLC | | Oil Operator | Dec 2024 |
| 1250 | Double H Petroleum Corporation | Tulsa, OK 74136-5414 | Oil & Gas Operator | May 2006 |
| 1251 | Double J Enterprises | Loving, TX 76460 | Oil Operator | Apr 2025 |
| 1252 | Double J Oil Co LLC | Bristow, OK 74010-9532 | Oil & Gas Operator | Feb 2025 |
| 1253 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 1254 | Double J Resources Inc | Bradford, PA 16701-6506 | Oil & Gas Operator | Dec 2022 |
| 1255 | Double K Production | Graham, TX 76450 | Oil & Gas Operator | Sep 2014 |
| 1256 | Double L Contractors, LLC | Carthage, TX 75633 | Oil Operator | Apr 2025 |
| 1257 | Double L Drilling | Yates Center, KS 66783 | Oil Operator | Jun 2000 |
| 1258 | Double L Oil Producers | | Oil Operator | Dec 2019 |
| 1259 | Double L Operating | Graham, TX 76450 | Oil & Gas Operator | Nov 2018 |
| 1260 | Double M Petroproperties, Inc. | Haskell, TX 79521 | Oil & Gas Operator | Apr 2025 |
| 1261 | Double Play Oil & Gas | Portland, TX 78374 | Oil & Gas Operator | Dec 2001 |
| 1262 | Double Play Oil & Gas, Inc | Portland, TX 78374 | Oil & Gas Operator | Apr 2025 |
| 1263 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 1264 | Double R Operations | Terral, OK 73569-5021 | Oil Operator | Dec 2014 |
| 1265 | Double R Petroleum | | Oil & Gas Operator | Sep 2004 |
| 1266 | Double S Liberty Energy, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Apr 2025 |
| 1267 | Double S Operating Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2025 |
| 1268 | Double T Energy LLC | Lenorah, TX 79749 | Oil Operator | Apr 2025 |
| 1269 | Double Ten Petro | | Oil Operator | Jul 1994 |
| 1270 | Double U Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Feb 1996 |
| 1271 | Double U Oil Co., LTD. | San Antonio, TX 78217 | Oil & Gas Operator | May 2000 |
| 1272 | Doudna, Mark A. | Osawatomie, KS 66064 | Oil Operator | Nov 2009 |
| 1273 | Doug'S Pumping Service | | Oil Operator | Dec 2024 |
| 1274 | Dougherty Properties | Beeville, TX 78104 | Oil & Gas Operator | Jun 1997 |
| 1275 | Dougherty, H W | Petaluma, CA 94954 | Gas Operator | Oct 2019 |
| 1276 | Doughtie Operating Company, LLC | MC Queeney, TX 78123 | Oil & Gas Operator | Mar 2023 |
| 1277 | Douglas Edwards | | Oil Operator | Nov 1993 |
| 1278 | Douglas Fairbanks Holdings LLC | Pine Hurst, TX 77362-9998 | Oil & Gas Operator | Feb 2025 |
| 1279 | Douglas Investments Inc | Fort Worth, TX 76137 | Oil Operator | Jan 2020 |
| 1280 | Douglas Oil & Gas Co Inc | Ada, OK 74820 | Oil Operator | Apr 2014 |
| 1281 | Douglas Oil & Gas Inc | Canonsburg, PA 15317 | Gas Operator | Dec 2003 |
| 1282 | Douglas Oil & Gas LP | State College, PA 16803 | Oil & Gas Operator | Dec 2007 |
| 1283 | Douglas Petroleum Inc. | Spring, TX 77379 | Oil & Gas Operator | Nov 2010 |
| 1284 | Douglas W. Baker Trustee | | Oil & Gas Operator | Dec 1993 |
| 1285 | Douglas Whitney | | Oil Operator | Dec 2004 |
| 1286 | Douglas, Marvin E Dba Douglas Radiation | | Oil & Gas Operator | Dec 2023 |
| 1287 | Douglas, Norvel Trust | H SPG NTL PK, AR 71909 | Oil & Gas Operator | Aug 2013 |
| 1288 | Douglass Dietz & Daley Inc | Oklahoma City, OK 73154-0125 | Oil & Gas Operator | Aug 2023 |
| 1289 | Dove Creek Energy, Inc. | Fort Worth, TX 76121 | Oil & Gas Operator | Apr 2025 |
| 1290 | Dove Creek Resources, LLC | Arlington, TX 76012 | Oil Operator | Apr 2025 |
| 1291 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 1292 | Dove Investments LLC | Wetumka, OK 74883 | Oil Operator | Oct 2024 |
| 1293 | Dove Mineral | Abilene, TX 79601 | Oil & Gas Operator | Dec 2010 |
| 1294 | Dover Atwood Corporation | Massillon, OH 44646 | Oil & Gas Operator | Dec 2024 |
| 1295 | Dover Oil Co | Marietta, OH 45750 | Oil & Gas Operator | Dec 1999 |
| 1296 | Dow Intrastate Gas Company | | Oil Operator | Dec 2023 |
| 1297 | Dow Mineral & Royalty Co, Inc | | Oil & Gas Operator | Jun 1994 |
| 1298 | Dowd, Gene | | Oil & Gas Operator | Dec 2013 |
| 1299 | Dowden, T. L. | Henderson, TX 75652 | Oil & Gas Operator | Apr 2025 |
| 1300 | Dowell Oil & Gas | Stephenville, TX 76401 | Oil & Gas Operator | Apr 2025 |