| 1401 | El-Kan Exploration | Garfield, KS 67529 | Oil Operator | Jul 1997 |
| 1402 | Elb Enterprise LLC | | Oil Operator | Aug 2025 |
| 1403 | Elendil Resources LLC | Pampa, TX 79066 | Oil & Gas Operator | Feb 2026 |
| 1404 | Elevate Energy LTD | Aurora, CO 80016 | Oil & Gas Operator | Sep 2025 |
| 1405 | Eleven Eleven Investments, LLC | Hays, KS 67601 | Oil Operator | Aug 2025 |
| 1406 | Elk City Oil Field Service | Elk City, KS 67344 | Oil Operator | Oct 1996 |
| 1407 | Elk Energy Holdings LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 1408 | Elk Oil Company | Overland Park, KS 66212 | Oil & Gas Operator | Sep 2007 |
| 1409 | Elk Oil Enterprises, LLC | Wetmore, KS 66550 | Oil Operator | Dec 2009 |
| 1410 | Elkhound Resources Inc | Wellsville, KS 66092 | Oil Operator | Aug 1998 |
| 1411 | Ellinwood Oil Reclaiming Inc | | Oil Operator | Oct 2009 |
| 1412 | Ellinwood Tank Service, Inc. | Chase, KS 67524 | Oil Operator | Jul 2022 |
| 1413 | Elliott Phillip | | Oil Operator | Feb 1992 |
| 1414 | Ellsworth Systems, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2005 |
| 1415 | Elm Creek Oil, LLC | | Oil Operator | Sep 2025 |
| 1416 | Elm III Operating Company LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2025 |
| 1417 | Elmer L. Karst Oil, A General Partnership | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 1418 | Elmore Farm | | Oil Operator | Sep 2009 |
| 1419 | Elmore, John A. And Patricia R. | Sedan, KS 67361 | Oil Operator | Sep 2025 |
| 1420 | Elwell, Mike | Lawrence, KS 66044 | Oil Operator | Dec 2009 |
| 1421 | Elysium Energy, L.L.C | Denver, CO 80202 | Oil & Gas Operator | Jun 2019 |
| 1422 | Emc Properties, LLC | Clinton, MO 64735 | Oil Operator | Dec 2019 |
| 1423 | Emerson, Jim | Plano, TX 75074 | Oil & Gas Operator | Jan 1995 |
| 1424 | Empire Energy E & P, LLC | Mayville, NY 14757 | Oil & Gas Operator | Mar 2019 |
| 1425 | Empire Explorati | | Oil Operator | Dec 1996 |
| 1426 | Empire Exploration Inc | Wichita, KS 67202 | Oil & Gas Operator | Jul 1997 |
| 1427 | En/Drill America, Inc. | Crystal, MN 55428 | Oil & Gas Operator | Apr 2009 |
| 1428 | Encana Oil & Gas (USA) Inc. | Denver, CO 80202 | Oil & Gas Operator | Oct 2020 |
| 1429 | Encore Operating Company | Denver, CO 80227 | Oil & Gas Operator | Dec 2019 |
| 1430 | Encore Operating LP | Plano, TX 75024 | Oil & Gas Operator | Dec 2025 |
| 1431 | Encorp, Inc. | Wichita, KS 67206 | Oil Operator | May 2007 |
| 1432 | End Of The Trails Re | | Oil Operator | Sep 2025 |
| 1433 | Endeavor Energy Resources, LP | Midland, TX 79701 | Oil & Gas Operator | Nov 2025 |
| 1434 | Energy Development Corporation | Houston, TX 77067 | Oil & Gas Operator | Dec 2024 |
| 1435 | Energy Explorati | | Oil & Gas Operator | Oct 1993 |
| 1436 | Energy Exploration & Production, Inc. | Wichita, KS 67201 | Oil Operator | Jan 2004 |
| 1437 | Energy Managemen | | Oil & Gas Operator | Jul 1991 |
| 1438 | Energy Marketing | | Oil & Gas Operator | May 1995 |
| 1439 | Energy Marketing, Inc. | Omaha, NE 68102 | Oil & Gas Operator | Jul 2005 |
| 1440 | Energy One Oil Operations | | Oil Operator | Mar 2003 |
| 1441 | Energy Productio | | Oil & Gas Operator | Jan 1986 |
| 1442 | Energy Reserves | | Oil & Gas Operator | Oct 1993 |
| 1443 | Energy Reserves Group, Inc. | Wichita, KS 67202 | Oil & Gas Operator | May 2002 |
| 1444 | Energy Search Operating Company | | Oil Operator | Dec 2009 |
| 1445 | Energy Sources I | | Oil & Gas Operator | Jul 1986 |
| 1446 | Energy Three Inc. | Jackson, MS 39211 | Oil & Gas Operator | Sep 2025 |
| 1447 | Energy-Vest, Inc. | Bull Shoals, AR 72619 | Oil Operator | Sep 2009 |
| 1448 | Energypro, Inc. | Magnolia, TX 77354 | Oil & Gas Operator | Feb 2026 |
| 1449 | Energyquest II, LLC | The Woodlands, TX 77381 | Oil & Gas Operator | Nov 2025 |
| 1450 | Energyquest Management, LLC | Houston, TX 77090 | Oil & Gas Operator | Apr 2021 |
| 1451 | Enerjex Kansas, Inc. | Leawood, KS 66211 | Oil & Gas Operator | Apr 2010 |
| 1452 | Enervest Operating LLC | Houston, TX 77002 | Oil & Gas Operator | Feb 2026 |
| 1453 | Enex Resources C | | Gas Operator | Nov 1987 |
| 1454 | Enex Resources Corporation | Houston, TX 77002 | Oil & Gas Operator | Dec 2009 |
| 1455 | Engel Farms Corporation | Liberal, KS 67901 | Gas Operator | Mar 2003 |
| 1456 | Engel Investments LLC | Hays, KS 67601 | Oil Operator | Aug 2025 |
| 1457 | Enmark Gas Gathering LP | Dallas, TX 75252 | Oil & Gas Operator | Sep 2025 |
| 1458 | Enoch Oil | Wichita, KS 67216 | Oil Operator | Jan 2001 |
| 1459 | Enron Corporatio | | Oil & Gas Operator | Aug 1999 |
| 1460 | Ensign Oil & Gas Inc. | | Oil & Gas Operator | Jul 1993 |
| 1461 | Ensign Operating | | Oil & Gas Operator | Oct 1994 |
| 1462 | Ensminger D & J | | Oil Operator | Dec 1994 |
| 1463 | Ensminger Energy LLC | Moran, KS 66755 | Oil Operator | Sep 2025 |
| 1464 | Ensminger Oil, LLC | Moran, KS 66755 | Oil Operator | Sep 2025 |
| 1465 | Ensminger, Donald & Jack, A General Partnership | Moran, KS 66755 | Oil Operator | Jun 2005 |
| 1466 | Ensz, Jerry | Sublette, KS 67877 | Gas Operator | Sep 2025 |
| 1467 | Enterprise Inc | Hays, KS 67601 | Oil Operator | Sep 2015 |
| 1468 | Enterprise Marke | | Oil & Gas Operator | Oct 1992 |
| 1469 | Enterprise Oil Marketing Corp. | Little Rock, AR 72206 | Oil Operator | Sep 1998 |
| 1470 | Enterra Resources, LLC | Edmond, OK 73083 | Oil & Gas Operator | Sep 2025 |
| 1471 | Entransco Energy LLC | Dewey, OK 74029 | Oil & Gas Operator | Oct 2024 |
| 1472 | EOG Resources, Inc. | Midland, TX 79702 | Oil & Gas Operator | Feb 2026 |
| 1473 | Epoc, LLC | Andover, KS 67002 | Oil Operator | Sep 2025 |
| 1474 | Eps Resources Corp | Englewood, CO 80111 | Oil & Gas Operator | Dec 2009 |
| 1475 | Equinox Oil Comp | | Oil Operator | Dec 1996 |
| 1476 | Equinox Oil Company Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2019 |
| 1477 | Equity Drilling | | Gas Operator | Dec 1993 |
| 1478 | Erbe, Dwayne E. (Estate) | Neodesha, KS 66757 | Oil Operator | Jul 2025 |
| 1479 | Erbert Don Oil C | | Oil Operator | May 1993 |
| 1480 | Erbert, Harold | Iola, KS 66749 | Oil Operator | Dec 1992 |
| 1481 | Ernst & Steinle | | Oil Operator | Oct 1991 |
| 1482 | Ers Operating Company LLC | Bothell, WA 98012 | Oil & Gas Operator | Jun 2016 |
| 1483 | Escher Corporation | Oklahoma City, OK 73120 | Oil & Gas Operator | Aug 2025 |
| 1484 | Esp Development, Inc. | Salina, KS 67401 | Oil Operator | Sep 2025 |
| 1485 | Essex Resources, LLC | Coffeyville, KS 67337 | Oil Operator | Aug 2025 |
| 1486 | Estate Of Crawford Oil & Gas, Inc. | Midland, TX 79705 | Oil & Gas Operator | Aug 2006 |
| 1487 | Eternity Exploration, LLC | Coppell, TX 75019 | Oil Operator | Jun 2021 |
| 1488 | Eufaula Enterpri | | Oil & Gas Operator | Mar 1986 |
| 1489 | Euram Petroleum | | Oil Operator | Apr 1986 |
| 1490 | Evans Douglas G | | Oil Operator | Aug 1987 |
| 1491 | Evans Energy, LLC | Mount Hope, KS 67108 | Oil & Gas Operator | Sep 2025 |
| 1492 | Evans Jay Oil Co | Iola, KS 66749 | Oil Operator | Apr 2001 |
| 1493 | Evans John Roy | | Oil Operator | Nov 1992 |
| 1494 | Evans Oil D W - | | Oil Operator | Mar 1992 |
| 1495 | Evans Oil Inc. | Lebo, KS 66856 | Oil Operator | Sep 2025 |
| 1496 | Evans Well Service | | Oil Operator | Oct 2013 |
| 1497 | Evans, Glenn A. | Paola, KS 66071 | Oil Operator | Oct 1989 |
| 1498 | Evenson Oil Oper | | Oil Operator | Nov 1991 |
| 1499 | Everglow Energy, LLC | Oklahoma City, OK 73162 | Oil & Gas Operator | Sep 2025 |
| 1500 | Evergreen Operating Corp | Denver, CO 80202 | Oil & Gas Operator | Dec 2019 |