| 1301 | Dominion Minerals Corporation | Houston, TX 77014 | Oil & Gas Operator | Nov 2009 |
| 1302 | Don G. Wiley, Jr. | | Oil Operator | Dec 1979 |
| 1303 | Don Townes | | Oil Operator | Sep 2000 |
| 1304 | Don W. Holcomb | | Oil Operator | Feb 1996 |
| 1305 | Don Webb | | Oil Operator | Mar 1984 |
| 1306 | Donald & Danny Dews Production | | Oil Operator | Jan 2025 |
| 1307 | Donald J. Zadeck | | Oil & Gas Operator | Feb 1998 |
| 1308 | Donald Owens | | Oil & Gas Operator | Dec 2024 |
| 1309 | Donn G. Thompson, Et Al | | Oil Operator | Apr 1987 |
| 1310 | Donnie R. Morrow | | Oil Operator | Dec 2024 |
| 1311 | Donny Joe Barnhill | | Gas Operator | Dec 2024 |
| 1312 | Doran & Braddock & Nelson Petr | | Oil Operator | Feb 1982 |
| 1313 | Doran And Braddock | | Oil & Gas Operator | Nov 1984 |
| 1314 | Dorbert Oil & Gas, Inc. | | Gas Operator | Aug 1988 |
| 1315 | Dorcheat Oil & Gas, LLC | | Oil & Gas Operator | Dec 2024 |
| 1316 | Dorchester Exploration, Inc. | Dallas, TX 75231 | Oil & Gas Operator | Aug 2001 |
| 1317 | Dore-Dyn Production Co., Inc. | | Oil & Gas Operator | Jul 1993 |
| 1318 | Dorothy F. Hamlin | | Oil Operator | Dec 1985 |
| 1319 | Dorothy Oil Company | | Oil & Gas Operator | Oct 1994 |
| 1320 | Dossie Dews | | Oil & Gas Operator | Dec 2024 |
| 1321 | Double "LL" Oil Company | | Gas Operator | Dec 1992 |
| 1322 | Double Eagle Petroleum Corp | Evansville, IN 47725 | Oil & Gas Operator | Feb 2026 |
| 1323 | Double J Operating Company, Inc. | San Antonio, TX 78205 | Oil Operator | Jan 2008 |
| 1324 | Douglas Edwards | | Oil Operator | Nov 1993 |
| 1325 | Dove Drilling, Inc. | Kilgore, TX 75663 | Oil & Gas Operator | Nov 1997 |
| 1326 | Dow Chemical Co. | | Oil & Gas Operator | Dec 1997 |
| 1327 | Dow Intrastate Gas Company | | Oil Operator | Dec 2023 |
| 1328 | Dow Mineral & Royalty Co, Inc | | Oil & Gas Operator | Jun 1994 |
| 1329 | Doyle Dempsey | | Oil Operator | May 1997 |
| 1330 | DR. Richard C. Baker | | Oil & Gas Operator | Sep 2009 |
| 1331 | Dragon Energy Corporation | | Oil & Gas Operator | Oct 2006 |
| 1332 | Drake Energy Corporation | | Gas Operator | Dec 2024 |
| 1333 | DRD Operating Company | | Oil & Gas Operator | Feb 2014 |
| 1334 | Drew Cornell, Inc. | | Oil & Gas Operator | Jun 1992 |
| 1335 | Drew Cornell, Inc.-Agent | | Oil & Gas Operator | Sep 1990 |
| 1336 | Drew Cornell,Inc.-C.H.Lawrence | | Oil & Gas Operator | Sep 1990 |
| 1337 | Drew Cornell,Inc.-R Waterbury | | Oil Operator | Jun 1999 |
| 1338 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Nov 2025 |
| 1339 | Drilling Consultants, Inc. | | Oil & Gas Operator | Mar 1992 |
| 1340 | Drilling, Operg & Explor, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1341 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 1342 | Drillmar Operating Company | Houston, TX 77019 | Oil & Gas Operator | Jun 2013 |
| 1343 | Drmas, LLC | | Oil & Gas Operator | Nov 2024 |
| 1344 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 1345 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 1346 | Dubach Gas Company | | Oil Operator | May 2003 |
| 1347 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 1348 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 1349 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 1350 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 1351 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 1352 | Dula Energy, Inc. | | Oil & Gas Operator | Sep 2002 |
| 1353 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 1354 | Duncan Oil Company | Holliday, TX 76366 | Oil Operator | Mar 2008 |
| 1355 | Duncan Oil Inc | Denver, CO 80210 | Oil & Gas Operator | Jun 2016 |
| 1356 | Dundee Petroleum, Inc. | Buffalo Gap, TX 79508 | Oil & Gas Operator | Aug 2003 |
| 1357 | Dune Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2016 |
| 1358 | Dunhill Expl. & Prod., LLC | | Oil & Gas Operator | Nov 2004 |
| 1359 | Dunhill Resources, Inc. | | Oil & Gas Operator | Nov 2005 |
| 1360 | Dunn Exploration Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 1361 | Dupont Oil Company | | Oil Operator | Feb 1998 |
| 1362 | Dupree And Dupree | | Oil Operator | Dec 1998 |
| 1363 | Dvi | | Oil Operator | Dec 2008 |
| 1364 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1365 | Dykes Oil Co. | | Oil Operator | Dec 2001 |
| 1366 | Dynaco, Incorporated | | Oil & Gas Operator | Dec 1980 |
| 1367 | Dynamic Exploration PTRS, LLC | | Oil & Gas Operator | Nov 2024 |
| 1368 | Dynamic Exploration, Inc. | | Oil & Gas Operator | Oct 2003 |
| 1369 | Dynamic Offshore Resources, LLC | Houston, TX 77042 | Oil & Gas Operator | Feb 2026 |
| 1370 | Dynamic Production Inc Of Tex | | Gas Operator | Oct 1987 |
| 1371 | Dzurik Interests, Inc. | | Oil & Gas Operator | Dec 2024 |
| 1372 | E & B Equipment | Liberty, TX 77575 | Oil & Gas Operator | Feb 2010 |
| 1373 | E & E Production Company, Inc. | | Oil & Gas Operator | Dec 2004 |
| 1374 | E D Markham | | Gas Operator | Nov 1978 |
| 1375 | E Lee Mills | | Oil Operator | Aug 1987 |
| 1376 | E Texas Production MGMT Co Inc | | Oil & Gas Operator | Oct 1996 |
| 1377 | E-Z Mart Stores, Inc. | | Oil Operator | Jul 2004 |
| 1378 | E. & H. Oil Company | Woodson, TX 76491 | Oil & Gas Operator | May 1998 |
| 1379 | E. & S. Drilling Company | | Oil & Gas Operator | Feb 1995 |
| 1380 | E. A. Courtney | | Oil & Gas Operator | Oct 1978 |
| 1381 | E. Conway Butts, Inc. | | Oil & Gas Operator | Apr 1991 |
| 1382 | E. G. Williamson, Jr. | | Oil Operator | Jan 1993 |
| 1383 | E. L. Cox And Stanrich Oil Co. | | Oil & Gas Operator | Jul 1981 |
| 1384 | E. L. Larry | | Oil & Gas Operator | Mar 1989 |
| 1385 | E. M. Self | | Oil Operator | Feb 1981 |
| 1386 | E. P. Alexander | | Oil Operator | Jan 1984 |
| 1387 | E. P. Alexander, Et Al | | Oil Operator | Jan 1984 |
| 1388 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2026 |
| 1389 | Eads Operating Company | | Oil & Gas Operator | Mar 1991 |
| 1390 | Eagle Energy Development Co | La Porte, TX 77571 | Oil & Gas Operator | Dec 2024 |
| 1391 | Eagle Oil & Gas Co. | Dallas, TX 75225 | Oil & Gas Operator | Feb 2026 |
| 1392 | Eagle Oil & Gas, Inc. | | Oil & Gas Operator | Nov 1984 |
| 1393 | Eagle Oil Management Co., LLC | | Oil & Gas Operator | Jan 2023 |
| 1394 | Earl Dyess | | Oil & Gas Operator | Jul 1990 |
| 1395 | Earl Markham Et Al | | Gas Operator | Jun 1979 |
| 1396 | Earl W Todd | | Oil Operator | Jan 2008 |
| 1397 | Easom-Middleton Operating, Inc | | Oil & Gas Operator | Sep 1992 |
| 1398 | Eason Oil Company | Oklahoma City, OK 73112 | Oil & Gas Operator | Mar 2012 |
| 1399 | Eason Petroleum Company | | Oil & Gas Operator | Jul 2016 |
| 1400 | East Ajax Oil Corporation | | Oil & Gas Operator | May 2000 |