| 1401 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 1402 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 1403 | Howell C W | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2015 |
| 1404 | Howell Crane & Rigging, Inc. | San Antonio, TX 78220 | Oil Operator | Apr 2026 |
| 1405 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 1406 | Howell Jason | Wynona, OK 74084 | Oil Operator | Jan 2026 |
| 1407 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 1408 | Howell Oil Compa | | Oil & Gas Operator | Aug 1995 |
| 1409 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Dec 2025 |
| 1410 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 1411 | Howell'S Well Service, Inc. | | Oil & Gas Operator | Jan 2026 |
| 1412 | Howell, Betty L. | Lakewood, NY 14750 | Gas Operator | Dec 2024 |
| 1413 | Howells Oil & Gas | Graysville, OH 45734 | Oil & Gas Operator | Dec 2025 |
| 1414 | Howitzer Operating, LLC | Dallas, TX 75380 | Oil Operator | Apr 2026 |
| 1415 | Howle Operating Account, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1999 |
| 1416 | Howle, A.G. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2011 |
| 1417 | Howles, William A | Savona, NY 14879 | Gas Operator | Dec 2024 |
| 1418 | Hoy Production LLC | | Gas Operator | Feb 2026 |
| 1419 | Hoyt Energy L.L.C. | | Oil Operator | Dec 2025 |
| 1420 | Hoyt John C | Bartlesville, OK 74005-1316 | Oil Operator | Feb 2000 |
| 1421 | Hoyt Oil & Gas LLC | Cushing, OK 74023-0442 | Oil & Gas Operator | Dec 2025 |
| 1422 | HPC Energy LLC | Midland, TX 79703 | Oil & Gas Operator | Aug 2013 |
| 1423 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 1424 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 1425 | Hpoc, LLC | Cuba, NM 87013 | Oil Operator | Mar 2025 |
| 1426 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Sep 2025 |
| 1427 | HR Energy LLC | Shelby, MT 59474 | Oil & Gas Operator | Feb 2026 |
| 1428 | HR McClure | Scottdale, PA 15683-1533 | Gas Operator | Dec 2018 |
| 1429 | HR Petroleum | Corpus Christ, TX 78413 | Oil & Gas Operator | Apr 1998 |
| 1430 | HRB Oil | Houston, TX 77042 | Oil & Gas Operator | Oct 1998 |
| 1431 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Apr 2026 |
| 1432 | Hrbacek Oil Corp. | La Grange, TX 78945 | Oil & Gas Operator | Feb 2004 |
| 1433 | Hrbek, R. L. | Merino, CO 80741 | Oil & Gas Operator | Jan 2024 |
| 1434 | HRC Inc | Hobbs, NM 88241 | Gas Operator | Jun 2017 |
| 1435 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 1436 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | Feb 2026 |
| 1437 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Apr 2026 |
| 1438 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |
| 1439 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 1440 | HRL Oilfields In | | Oil Operator | Jun 1998 |
| 1441 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 1442 | HRM Resources III LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2022 |
| 1443 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 1444 | Hronek, Kenneth | Caldwell, TX 77836 | Oil & Gas Operator | Apr 2026 |
| 1445 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 1446 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 1447 | HS Resources | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1997 |
| 1448 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 1449 | Hsumy Oil & Gas, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 1450 | HTC Gas Company, LLC | Hindman, KY 41822 | Gas Operator | Dec 2023 |
| 1451 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 1452 | Hub-Cap Oil Company | Arlington, TX 76016 | Oil & Gas Operator | Dec 2013 |
| 1453 | Hub-Hill Inc | San Antonio, TX 78230 | Oil Operator | Nov 1998 |
| 1454 | Hubbard Creek Coal Gas LLC | | Gas Operator | Jan 2026 |
| 1455 | Hubbard Operating | Ozona, TX 76943 | Gas Operator | Apr 2026 |
| 1456 | Hubbs III, LLC | | Oil & Gas Operator | Mar 2024 |
| 1457 | Hubcap Oil, LLC | Boerne, TX 78015 | Oil Operator | Apr 2026 |
| 1458 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 1459 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 1460 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 1461 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Apr 2026 |
| 1462 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 1463 | Huber Oil Company, A General Partnership | Madison, KS 66860 | Oil & Gas Operator | Dec 2025 |
| 1464 | Hubl/Harbin | | Oil Operator | Dec 1994 |
| 1465 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Dec 2025 |
| 1466 | Hudgens Lester E | Bartlesville, OK 74006-0215 | Oil Operator | Mar 2015 |
| 1467 | Hudgens Operating Co., Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 1995 |
| 1468 | Hudson Brothers Mining Co., Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 1994 |
| 1469 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |
| 1470 | Hudson Energy LLC | | Oil Operator | Dec 2025 |
| 1471 | Hudson Group LLC | Casper, WY 82601 | Oil & Gas Operator | Jul 2025 |
| 1472 | Hudson Oil Company Of Texas | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2025 |
| 1473 | Hudson, Comer Oil & Gas | Cisco, TX 76437 | Oil & Gas Operator | Jan 2003 |
| 1474 | Huey Dean | | Oil Operator | Oct 2000 |
| 1475 | Hufco, Incorporated | | Oil & Gas Operator | Dec 2020 |
| 1476 | Huff Minerals, LTD. | Amarillo, TX 79101 | Gas Operator | Apr 2026 |
| 1477 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 1478 | Huffco Petroleum Corporation | | Oil & Gas Operator | Jul 1988 |
| 1479 | Huffman Arthur | Waynesburg, PA 15370-1437 | Gas Operator | Dec 2025 |
| 1480 | Huffman, H. L., LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Sep 1994 |
| 1481 | Huffman-Bowers Inc | New Lexington, OH 43764 | Oil & Gas Operator | Dec 2025 |
| 1482 | Hufo Production Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2002 |
| 1483 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 1484 | Huggs Inc. & Bec, Et Al | | Oil & Gas Operator | Feb 1998 |
| 1485 | Huggs Incorporated, Et Al | | Oil & Gas Operator | Feb 1998 |
| 1486 | Hugh A. Hawthorne, Et Al | | Oil & Gas Operator | Dec 1978 |
| 1487 | Hughes & Hughes | | Oil & Gas Operator | May 1984 |
| 1488 | Hughes & New Oil Co. | | Oil Operator | Jul 1993 |
| 1489 | Hughes & New-D. Braswell | | Oil & Gas Operator | Jun 1983 |
| 1490 | Hughes & Patterson Oper. Corp. | Albany, TX 76430 | Oil & Gas Operator | Apr 2026 |
| 1491 | Hughes & Shawver | Olney, TX 76374 | Oil & Gas Operator | Aug 1996 |
| 1492 | Hughes Denny Offshore Expl Inc | | Oil & Gas Operator | Nov 1988 |
| 1493 | Hughes Drilling Co Inc | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 1494 | Hughes Drilling Co, A General Partnership | Wellsville, KS 66092 | Oil Operator | Dec 2025 |
| 1495 | Hughes Eastern Corporation | Ridgeland, MS 39157 | Oil & Gas Operator | Jan 2026 |
| 1496 | Hughes Eastern Petroleum, Inc. | | Oil & Gas Operator | Apr 1993 |
| 1497 | Hughes Eastern Petroleum, LTD | | Oil & Gas Operator | Jun 1986 |
| 1498 | Hughes Gas Systems LLC | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2026 |
| 1499 | Hughes George B | Asher, OK 74826-0165 | Oil & Gas Operator | Mar 2011 |
| 1500 | Hughes Legacy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |