| 1301 | Double L Drilling | Yates Center, KS 66783 | Oil Operator | Jun 2000 |
| 1302 | Double L Oil Producers | | Oil Operator | Dec 2019 |
| 1303 | Double R Oil Co. | Charlotte, TX 78011 | Oil & Gas Operator | May 2010 |
| 1304 | Double Ten Petro | | Oil Operator | Jul 1994 |
| 1305 | Doudna, Mark A. | Osawatomie, KS 66064 | Oil Operator | Nov 2009 |
| 1306 | Doug'S Pumping Service | | Oil Operator | Sep 2025 |
| 1307 | Dover Atwood Corp. | Massillon, OH 44646 | Oil & Gas Operator | Dec 2024 |
| 1308 | Downing-Nelson Oil Co Inc | Hays, KS 67601 | Oil & Gas Operator | Sep 2025 |
| 1309 | DR Well Operator | | Oil Operator | Jan 1990 |
| 1310 | Drake Exploration LLC | Arkansas City, KS 67005 | Oil & Gas Operator | Nov 2025 |
| 1311 | Dreiling Exploration LLC | Victoria, KS 67671 | Oil Operator | Mar 2018 |
| 1312 | Dreiling Limited | | Oil Operator | Jun 1984 |
| 1313 | Dreiling Oil Inc | Hays, KS 67601 | Oil Operator | Jun 2018 |
| 1314 | Dreiling Resourc | | Oil Operator | Oct 1996 |
| 1315 | Dreiling Resources Inc. | Victoria, KS 67671 | Oil Operator | Sep 1997 |
| 1316 | Dreyer Oil | | Oil Operator | Dec 2019 |
| 1317 | Dreyer Oil - Lel | | Oil Operator | Nov 1993 |
| 1318 | Driftwood Oil Co. | Russell, KS 67665 | Oil Operator | Jan 1988 |
| 1319 | Drilex Oil & Gas | | Oil Operator | Apr 1987 |
| 1320 | Driller'S & Prod | | Oil & Gas Operator | Oct 1994 |
| 1321 | Drillers & Producers, Inc. | Newton, KS 67114 | Oil Operator | Dec 2019 |
| 1322 | Driscoll Jerry J | | Oil Operator | Apr 1994 |
| 1323 | Driscoll Lease O | | Oil Operator | Jul 1988 |
| 1324 | Driscoll Lease Operations, Inc. | Russell, KS 67665 | Oil Operator | Dec 1998 |
| 1325 | Driscoll, Jerry J Oil Investment Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 1326 | DRL Operating In | | Oil Operator | Sep 1986 |
| 1327 | Drop Tine Exploration, LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | Dec 2019 |
| 1328 | Du Pont Oil Comp | | Oil Operator | May 1984 |
| 1329 | Duane Exploration Limited | Andover, KS 67002 | Oil Operator | Jul 1996 |
| 1330 | Dubois, Allen | Whitewater, KS 67154 | Oil Operator | May 2000 |
| 1331 | Dudrey Carl | | Oil & Gas Operator | Feb 1993 |
| 1332 | Duer Wagoner Com | | Gas Operator | Sep 1988 |
| 1333 | Duke Drilling Co | Wichita, KS 67202 | Oil & Gas Operator | Feb 2006 |
| 1334 | Duke Oil & Gas Company, LLC | Wellsville, KS 66092 | Oil Operator | Sep 2025 |
| 1335 | Duke Oil LLC | Garnett, KS 66032 | Oil Operator | Sep 2025 |
| 1336 | Duke, Hanes Partnership | San Clemente, CA 92672 | Gas Operator | Oct 2004 |
| 1337 | Dunbar & Son Oil | | Oil & Gas Operator | Oct 1988 |
| 1338 | Duncan Energy Company | Denver, CO 80202 | Oil & Gas Operator | Mar 2008 |
| 1339 | Duncan Oil Properties, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Feb 2026 |
| 1340 | Dunham'S Oil, LLC | Eureka, KS 67045 | Oil Operator | Aug 2025 |
| 1341 | Dunne Equities I | | Oil & Gas Operator | Dec 1995 |
| 1342 | Dunne Equities Operating, Inc. | Houston, TX 77057 | Oil & Gas Operator | Aug 2022 |
| 1343 | Dunne Equities, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Apr 2014 |
| 1344 | Dunne Investments Operating, Inc. | Wichita, KS 67226 | Oil Operator | Mar 2002 |
| 1345 | Dunne Oil Co. | Wichita, KS 67202 | Oil Operator | Apr 1999 |
| 1346 | Dunne-Gardner Pe | | Oil & Gas Operator | Nov 1992 |
| 1347 | Dunne-Gardner Petroleum, Inc. | Wichita, KS 67202 | Gas Operator | Jun 2022 |
| 1348 | Dunsmoor, David E. | Grand Junction, CO 81504 | Oil Operator | Jul 1998 |
| 1349 | Durbin, Ronald R. | Moline, KS 67353 | Oil Operator | Dec 1988 |
| 1350 | Dustin Enterprise | Olathe, KS 66062 | Oil Operator | Feb 1998 |
| 1351 | Dutton Bill J Oi | | Oil & Gas Operator | Oct 1992 |
| 1352 | Dwarf Oil Company | | Oil & Gas Operator | Mar 2025 |
| 1353 | Dyco Petroleum Corporation | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2015 |
| 1354 | Dyer, Charles Wilbur | Longton, KS 67352 | Oil Operator | Jul 2025 |
| 1355 | E & B Natural Resources Management Corporation | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 1356 | E & E Oil | | Oil Operator | Dec 2019 |
| 1357 | E K Energy LLC | Colony, KS 66015 | Oil Operator | Sep 2025 |
| 1358 | E O R Petroleum | | Oil Operator | Oct 1987 |
| 1359 | E R Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Jan 2025 |
| 1360 | E S P Developmne | | Oil Operator | Oct 1993 |
| 1361 | E&E Oil LLC | Canton, KS 67428 | Oil Operator | Sep 2025 |
| 1362 | E. L. Daniels Drilling Contractor | | Oil Operator | Feb 2014 |
| 1363 | E2 Operating LLC | Tulsa, OK 74135 | Oil & Gas Operator | Feb 2026 |
| 1364 | Eads Operating C | | Oil Operator | Jun 1990 |
| 1365 | Eagle Creek Corporation | Andover, KS 67002 | Oil & Gas Operator | Sep 2025 |
| 1366 | Eagle Creek Resources, LLC | Sewickley, PA 15143 | Oil & Gas Operator | Dec 2024 |
| 1367 | Eagle Energy | Midland, TX 79710 | Oil & Gas Operator | Aug 1994 |
| 1368 | Eagle Energy Resources, LLC | La Porte, TX 77571 | Oil & Gas Operator | Feb 2026 |
| 1369 | Eagle Energy, Inc. | Moreland, KS 67650 | Oil & Gas Operator | Dec 2021 |
| 1370 | Eagle Exploratio | | Oil & Gas Operator | Oct 1991 |
| 1371 | Eagle Exploration Co., Inc. | Amarillo, TX 79105 | Oil & Gas Operator | Dec 2019 |
| 1372 | Eagle Oil Compan | | Oil Operator | Jul 1990 |
| 1373 | Eagle Oil, LLC | Moline, KS 67353 | Oil Operator | Oct 2016 |
| 1374 | Eagle Petroleum | | Oil & Gas Operator | Nov 1995 |
| 1375 | Eagle Petroleum, Inc. | Ellinwood, KS 67526 | Oil Operator | Sep 2025 |
| 1376 | Eagle Resources | | Oil & Gas Operator | Mar 1987 |
| 1377 | Eagle River Ener | | Oil Operator | Dec 1996 |
| 1378 | Eagle River Energy Corporation | Broken Arrow, OK 74011 | Oil & Gas Operator | Nov 2025 |
| 1379 | Earco Oil Operations, Inc. | McPherson, KS 67460 | Oil Operator | Mar 1999 |
| 1380 | Earth Scientists | | Oil Operator | Jan 1986 |
| 1381 | Eason Drilling & Services Co. | Tulsa, OK 74103 | Oil & Gas Operator | Dec 2005 |
| 1382 | Eastern Kansas Operating, LLC | Sun Lakes, AZ 85248 | Oil & Gas Operator | Apr 2018 |
| 1383 | Eastern Petroleu | | Oil & Gas Operator | Oct 1993 |
| 1384 | Easy Street Oil, Inc. | Iola, KS 66749 | Oil Operator | Sep 1999 |
| 1385 | Eby Oil Co. | | Oil Operator | Sep 2017 |
| 1386 | Ecco | | Oil Operator | Sep 2025 |
| 1387 | Echelon Land & Exploration Co. | Havana, FL 32333 | Oil Operator | Apr 1997 |
| 1388 | Eck Petroleum LLC | Kingman, KS 67068 | Oil Operator | Nov 2019 |
| 1389 | Edinger Incorpor | | Oil Operator | Oct 1986 |
| 1390 | Edison Operating Company LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 1391 | Edmiston Oil Com | | Oil & Gas Operator | May 1994 |
| 1392 | Edmiston Oil Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 1393 | Edwards Lease,The | | Oil Operator | Oct 2016 |
| 1394 | Edwards Oil Inco | | Oil Operator | Oct 1984 |
| 1395 | Edwards Oil Properties | | Oil Operator | Dec 2009 |
| 1396 | Ego Operating LLC | Boca Raton, FL 33431 | Oil Operator | Dec 2019 |
| 1397 | Einsel Gas Marketing | | Gas Operator | Feb 2019 |
| 1398 | Eitel Energy, LLC | Farlington, KS 66734 | Oil Operator | Aug 2025 |
| 1399 | El Chjon Gas Com | | Gas Operator | May 1988 |
| 1400 | El Paso E&P Company, L.P. | Houston, TX 77002 | Oil & Gas Operator | Mar 2013 |