| 1301 | Drew Cornell,Inc.-R Waterbury | | Oil Operator | Jun 1999 |
| 1302 | Dreyer Oil | | Oil Operator | Dec 2019 |
| 1303 | Dreyer Oil - Lel | | Oil Operator | Nov 1993 |
| 1304 | Dreyfus, Louis Natural Gas Corp | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2001 |
| 1305 | DRG Energy Inc. | Norman, OK 73026-3171 | Oil & Gas Operator | Jan 2026 |
| 1306 | DRH Properties LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2014 |
| 1307 | Dri Operating Company | West Chester, PA 19382-0000 | Gas Operator | Dec 2008 |
| 1308 | Driftwood Energy Operating, LLC | Dallas, TX 75219 | Oil & Gas Operator | Dec 2022 |
| 1309 | Driftwood Oil Co. | Russell, KS 67665 | Oil Operator | Jan 1988 |
| 1310 | Driftwood Oil, LLC | Jal, NM 88252 | Oil & Gas Operator | Apr 2026 |
| 1311 | Drilex Oil & Gas | | Oil Operator | Apr 1987 |
| 1312 | Drill Partners Management, LLC | Houston, TX 77056 | Oil & Gas Operator | Nov 2010 |
| 1313 | Driller'S & Prod | | Oil & Gas Operator | Oct 1994 |
| 1314 | Drillers & Producers, Inc. | Newton, KS 67114 | Oil Operator | Dec 2019 |
| 1315 | Drillers Energy Search, Inc | Denver, CO 80202 | Oil & Gas Operator | Aug 1996 |
| 1316 | Drillers LLC | Indiana, PA 15701 | Oil & Gas Operator | Dec 2024 |
| 1317 | Drillex Inc | Mentor, OH 44060 | Oil & Gas Operator | Dec 2003 |
| 1318 | Drilling & Production Co. | | Oil & Gas Operator | Feb 2026 |
| 1319 | Drilling Exploration & Operating Co. Inc. | | Oil & Gas Operator | Mar 2026 |
| 1320 | Drilling, Operg & Explor, Inc. | | Oil & Gas Operator | Feb 1990 |
| 1321 | Drillmar Energy, Inc. | Houston, TX 77079 | Oil & Gas Operator | Nov 2014 |
| 1322 | Drillmar Operating Company | Houston, TX 77019 | Oil & Gas Operator | Jun 2013 |
| 1323 | Drillogix Exploration LLC | Breckenridge, TX 76424 | Oil Operator | Jun 2026 |
| 1324 | Drilmor, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 1998 |
| 1325 | Driltrol | | Oil & Gas Operator | Dec 1984 |
| 1326 | Driscoll Jerry J | | Oil Operator | Apr 1994 |
| 1327 | Driscoll Lease O | | Oil Operator | Jul 1988 |
| 1328 | Driscoll Lease Operations, Inc. | Russell, KS 67665 | Oil Operator | Dec 1998 |
| 1329 | Driscoll S.W.D. Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Jun 2026 |
| 1330 | Driscoll, Jerry J Oil Investment Inc | Russell, KS 67665 | Oil Operator | Feb 2026 |
| 1331 | Driver Energy Of Texas | Dallas, TX 75379-5951 | Oil & Gas Operator | Apr 2011 |
| 1332 | DRL Operating In | | Oil Operator | Sep 1986 |
| 1333 | Drmas, LLC | | Oil & Gas Operator | Nov 2024 |
| 1334 | Drop Tine Exploration, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2019 |
| 1335 | DRS Exploration Inc. | San Antonio, TX 78209 | Oil & Gas Operator | May 1999 |
| 1336 | Drum Energy Corp | Hobbs, NM 88241 | Oil & Gas Operator | Mar 1996 |
| 1337 | Drum Energy, L.L.C. | | Gas Operator | Dec 2016 |
| 1338 | Drum Oil & Gas, Inc. | Houston, TX 77082 | Oil & Gas Operator | Jun 2026 |
| 1339 | Drum, Delton | Liberty, TX 77575 | Oil & Gas Operator | Jul 2005 |
| 1340 | Drummond Upstream LLC | Tulsa, OK 74104 | Oil & Gas Operator | Mar 2026 |
| 1341 | Drummond, F F | | Oil Operator | Feb 2026 |
| 1342 | Drumright Well Service Inc | Oilton, OK 74052 | Oil & Gas Operator | Mar 2026 |
| 1343 | Dry Coulee Oil & Gas Company | Oilmont, MT 59466 | Oil Operator | Oct 2003 |
| 1344 | Dry Creek Disposal Company, Inc. | | Oil & Gas Operator | Nov 2021 |
| 1345 | Dry Creek Operating, LLC | Fort Worth, TX 76109 | Oil & Gas Operator | Jun 2026 |
| 1346 | Dry Fork Production Co | Wichita Falls, TX 76301 | Oil Operator | Apr 2003 |
| 1347 | Dry Fork Production Co., LLC | Wichita Falls, TX 76307 | Oil & Gas Operator | Jun 2026 |
| 1348 | Dry Hole Producing LLC | Poland, OH 44514 | Oil & Gas Operator | Dec 2025 |
| 1349 | Dry Hole Producing LP | Poland, OH 44514-3631 | Oil & Gas Operator | Dec 2019 |
| 1350 | Dryes Corner LLC | Oklahoma City, OK 73118 | Oil Operator | Mar 2026 |
| 1351 | DSB Energy, LLC | The Woodlands, TX 77380 | Oil & Gas Operator | Jun 2026 |
| 1352 | DSM Exploration Inc | Oklahoma City, OK 73154 | Oil & Gas Operator | May 1996 |
| 1353 | DSR Oil & Gas, Inc. | Monahans, TX 79756 | Oil & Gas Operator | Jun 2026 |
| 1354 | DSTJ Corporation | Montgomery, TX 77316 | Oil & Gas Operator | Mar 2001 |
| 1355 | DSW Production Corp. | Houston, TX 77265 | Oil & Gas Operator | Jun 2026 |
| 1356 | DSX Operating Co. | Amarillo, TX 79105 | Oil & Gas Operator | Mar 2008 |
| 1357 | Dte Gas Resources, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Nov 2007 |
| 1358 | Dte Gas Resources, LLC | Fort Worth, TX 76102 | Oil & Gas Operator | Feb 2014 |
| 1359 | Du Pont Oil Comp | | Oil Operator | May 1984 |
| 1360 | Dual Energy, Inc. | | Oil & Gas Operator | Oct 2022 |
| 1361 | Dual Operating & Production Co | Tulsa, OK 74145-7831 | Oil & Gas Operator | Apr 2020 |
| 1362 | Dual Production Partners, LLC | Nacogdoches, TX 75963 | Oil & Gas Operator | Jun 2026 |
| 1363 | Dual Quiver Oil & Gas Op, LLC | Flower Mound, TX 75027 | Oil & Gas Operator | Jun 2026 |
| 1364 | Duane Exploration Limited | Andover, KS 67002 | Oil Operator | Jul 1996 |
| 1365 | Dubach Gas Company | | Oil Operator | May 2003 |
| 1366 | Dubisz, Richard And Deborah | East Aurora, NY 14052 | Gas Operator | Dec 2024 |
| 1367 | Dublin Petroleum Corporation | Enid, OK 73702-6029 | Oil & Gas Operator | Mar 2026 |
| 1368 | Dubois, Allen | Whitewater, KS 67154 | Oil Operator | May 2000 |
| 1369 | Ducharme Oil, LLC | | Oil & Gas Operator | Jan 2025 |
| 1370 | Duck Bros Dozer & Trucking Inc | Konawa, OK 74849 | Oil & Gas Operator | Mar 2026 |
| 1371 | Duck Creek Energy Inc | Brecksville, OH 44141 | Oil & Gas Operator | Dec 2025 |
| 1372 | Duck Creek Petroleum LLC | Wooster, OH 44691 | Oil & Gas Operator | Dec 2012 |
| 1373 | Duck Oil Company LLC | Konawa, OK 74849 | Oil Operator | Mar 2026 |
| 1374 | Ducky Oil Corporation | Fort Worth, TX 76120 | Oil & Gas Operator | Jun 2026 |
| 1375 | Duco Energy LLC | Tulsa, OK 74145-4514 | Oil & Gas Operator | Mar 2015 |
| 1376 | Ducote Oil Co. | | Oil & Gas Operator | Sep 1997 |
| 1377 | Duderstadt, A. R. | Boling, TX 77420 | Oil & Gas Operator | Jun 2026 |
| 1378 | Dudley Oil Co. | Crane, TX 79731 | Oil & Gas Operator | Jan 2006 |
| 1379 | Dudrey Carl | | Oil & Gas Operator | Feb 1993 |
| 1380 | Duer Wagner & Company | Fort Worth, TX 76102 | Oil & Gas Operator | Dec 1998 |
| 1381 | Duerfeldt | | Oil Operator | Dec 2025 |
| 1382 | Duff Oil Co | | Oil & Gas Operator | Aug 2000 |
| 1383 | Duffer William R | Edmond, OK 73034-6761 | Oil & Gas Operator | Aug 2018 |
| 1384 | Dugan Evan | Martinsburg, OH 43037 | Oil & Gas Operator | Dec 2024 |
| 1385 | Dugan Guy E | Walhonding, OH 43843 | Oil & Gas Operator | Dec 2015 |
| 1386 | Dugan Harry Oil Co | Newark, OH 43055 | Oil & Gas Operator | Dec 1993 |
| 1387 | Dugan Oil And Gas LLC | Walhonding, OH 43843-9612 | Oil & Gas Operator | Dec 2025 |
| 1388 | Dugan Production Corp | Farmington, NM 87499 | Oil & Gas Operator | Mar 2026 |
| 1389 | Duggan Stephen F | Boston, MA 2131 | Oil & Gas Operator | Jun 2010 |
| 1390 | Dugger, Glenn | Alice, TX 78332 | Oil & Gas Operator | Nov 2013 |
| 1391 | Duggins Equipment Inc | Woodward, OK 73802-1213 | Gas Operator | Feb 2026 |
| 1392 | Duhring Resource Co | Sheffield, PA 16347-2642 | Oil & Gas Operator | Dec 2012 |
| 1393 | Duink, Darryl | Hamburg, NY 14075 | Gas Operator | Dec 2024 |
| 1394 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 1395 | Duke Energy Field Services Inc | | Oil Operator | Mar 2000 |
| 1396 | Duke Energy Field Services LLC | | Oil Operator | Dec 2006 |
| 1397 | Duke Gas Company LLC | | Oil & Gas Operator | Mar 2026 |
| 1398 | Duke Oil & Gas Company, LLC | Wellsville, KS 66092 | Oil Operator | Feb 2026 |
| 1399 | Duke Oil & Gas Inc | Colorado City, TX 79512 | Oil & Gas Operator | May 2003 |
| 1400 | Duke Oil LLC | Garnett, KS 66032 | Oil Operator | Feb 2026 |