| 1401 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 1402 | Houston Oil Prod Enterprises,Inc | Houston, TX 77006 | Oil & Gas Operator | Jul 2025 |
| 1403 | Houston Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 1404 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Jul 2025 |
| 1405 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 1406 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 1407 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Jul 2025 |
| 1408 | Houtchens, DD & Anna D LVNG TRST | Garland, TX 75043 | Oil Operator | Jul 2025 |
| 1409 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 1410 | Hovgard & Fitzgerald | Abilene, TX 79608 | Oil & Gas Operator | Mar 1996 |
| 1411 | Hovivian Gregory E | La Crescenta, CA 91214 | Gas Operator | Dec 1999 |
| 1412 | Howard & Taylor | Wynnewood, OK 73098-9234 | Oil & Gas Operator | May 2025 |
| 1413 | Howard Drilling Inc | Mount Jewett, PA 16740-0556 | Oil & Gas Operator | Dec 2024 |
| 1414 | Howard E. Caywood Inc. | | Oil & Gas Operator | May 2025 |
| 1415 | Howard Energy Co Inc | | Oil & Gas Operator | Aug 2011 |
| 1416 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Jul 2025 |
| 1417 | Howard Operating Co. | Saint Jo, TX 76265 | Oil & Gas Operator | Jul 2025 |
| 1418 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 1419 | Howard, Anthony D | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 1420 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 1421 | Howard, Douglas J. | Houston, TX 77070 | Oil & Gas Operator | Mar 2008 |
| 1422 | Howard, Lorna Agent | | Oil & Gas Operator | Dec 2021 |
| 1423 | Howard, Patrick M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 1424 | Howard, Terry | Cherry Creek, NY 14723 | Gas Operator | Dec 2024 |
| 1425 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 1426 | Howden Petroleum Corp | Wetumka, OK 74883 | Gas Operator | Nov 1997 |
| 1427 | Howdyshell Pumping Inc | Logan, OH 43138 | Oil Operator | Dec 2024 |
| 1428 | Howe, Thomas L. | Hunt, NY 14846 | Gas Operator | Dec 2024 |
| 1429 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 1430 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 1431 | Howell C W | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2015 |
| 1432 | Howell Crane & Rigging, Inc. | San Antonio, TX 78220 | Oil Operator | Jul 2025 |
| 1433 | Howell Drilling, Inc. | San Antonio, TX 78230 | Oil & Gas Operator | Aug 2003 |
| 1434 | Howell Oil & Gas, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Oct 2019 |
| 1435 | Howell Oil Compa | | Oil & Gas Operator | Aug 1995 |
| 1436 | Howell Oil Company | Hutchinson, KS 67504 | Oil & Gas Operator | Mar 2025 |
| 1437 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 1438 | Howell'S Well Service, Inc. | | Oil & Gas Operator | Apr 2025 |
| 1439 | Howell, Betty L. | Lakewood, NY 14750 | Gas Operator | Dec 2024 |
| 1440 | Howell, Ray | Breckenridge, TX 76424 | Oil & Gas Operator | May 1998 |
| 1441 | Howells Oil & Gas | Graysville, OH 45734 | Oil & Gas Operator | Dec 2024 |
| 1442 | Howitzer Operating, LLC | Dallas, TX 75380 | Oil Operator | Jul 2025 |
| 1443 | Howle Operating Account, Inc. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 1999 |
| 1444 | Howle, A.G. | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2011 |
| 1445 | Howles, William A | Savona, NY 14879 | Gas Operator | Dec 2024 |
| 1446 | Hoy Production LLC | | Gas Operator | May 2025 |
| 1447 | Hoyt Energy L.L.C. | | Oil Operator | Apr 2025 |
| 1448 | Hoyt John C | Bartlesville, OK 74005-1316 | Oil Operator | Feb 2000 |
| 1449 | Hoyt Oil & Gas LLC | Cushing, OK 74023-0442 | Oil & Gas Operator | Apr 2025 |
| 1450 | HP Operating LLC | Seminole, OK 74868 | Oil Operator | May 2025 |
| 1451 | HPC Energy LLC | Midland, TX 79703 | Oil & Gas Operator | Aug 2013 |
| 1452 | HPC Incorporated | Denver, CO 80202 | Oil & Gas Operator | Nov 1998 |
| 1453 | HPC Operating, Inc. | Dallas, TX 75379 | Oil & Gas Operator | Mar 2008 |
| 1454 | Hpoc, LLC | Cuba, NM 87013 | Oil Operator | Dec 2024 |
| 1455 | HPPC, Inc. | Midland, TX 79701 | Oil & Gas Operator | Feb 2023 |
| 1456 | HR Energy LLC | Shelby, MT 59474 | Oil & Gas Operator | Apr 2025 |
| 1457 | HR McClure | Scottdale, PA 15683-1533 | Gas Operator | Dec 2018 |
| 1458 | HR Petroleum | Corpus Chrsti, TX 78413 | Oil & Gas Operator | Apr 1998 |
| 1459 | HRB Oil | Houston, TX 77042 | Oil & Gas Operator | Oct 1998 |
| 1460 | HRB Operating Company, Inc. | Bridgeport, TX 76426 | Oil & Gas Operator | Jul 2025 |
| 1461 | Hrbacek Oil Corp. | La Grange, TX 78945 | Oil & Gas Operator | Feb 2004 |
| 1462 | Hrbek, R.L. | Merino, CO 80741 | Oil & Gas Operator | Jan 2024 |
| 1463 | HRC Inc | Hobbs, NM 88241 | Gas Operator | Jun 2017 |
| 1464 | HRC Operating, LLC | Denver, CO 80202 | Oil & Gas Operator | Nov 2017 |
| 1465 | HRC Production Co | Houston, TX 77024 | Oil & Gas Operator | Apr 2025 |
| 1466 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Jul 2025 |
| 1467 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |
| 1468 | HRH Energy Group Incorporated | Carrollton, TX 75006 | Oil & Gas Operator | Nov 2009 |
| 1469 | HRL Oilfields In | | Oil Operator | Jun 1998 |
| 1470 | HRM Resources II, LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 1471 | HRM Resources III LLC | Denver, CO 80202 | Oil & Gas Operator | Jun 2022 |
| 1472 | HRM Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2015 |
| 1473 | Hronek, Kenneth | Caldwell, TX 77836 | Oil & Gas Operator | Jul 2025 |
| 1474 | Hrubetz Oil Co. | Dallas, TX 75225 | Oil Operator | Sep 1986 |
| 1475 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 1476 | HS Resources | Tulsa, OK 74136 | Oil & Gas Operator | Aug 1997 |
| 1477 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Dec 2005 |
| 1478 | Hsumy Oil & Gas Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Apr 2007 |
| 1479 | HTC Gas Company, LLC | Hindman, KY 41822 | Gas Operator | Dec 2023 |
| 1480 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 1481 | Hub-Cap Oil Company | Arlington, TX 76016 | Oil & Gas Operator | Dec 2013 |
| 1482 | Hub-Hill Inc | San Antonio, TX 78230 | Oil Operator | Nov 1998 |
| 1483 | Hubbard Creek Coal Gas LLC | | Gas Operator | Jun 2025 |
| 1484 | Hubbard Operating | Ozona, TX 76943 | Gas Operator | Jul 2025 |
| 1485 | Hubbs III, LLC | | Oil & Gas Operator | Mar 2024 |
| 1486 | Hubcap Oil, LLC | Boerne, TX 78015 | Oil Operator | Jul 2025 |
| 1487 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 1488 | Huber Corporation* J M | | Oil & Gas Operator | Feb 2008 |
| 1489 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 1490 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 1491 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jul 2025 |
| 1492 | Huber J M Corpor | | Oil & Gas Operator | Dec 1996 |
| 1493 | Huber Oil Company, A General Partnership | Madison, KS 66860 | Oil & Gas Operator | Feb 2025 |
| 1494 | Hubl/Harbin | | Oil Operator | Dec 1994 |
| 1495 | Hubler John | Tulsa, OK 74133-2716 | Oil & Gas Operator | Mar 2015 |
| 1496 | Huck Farms LLC | Stratford, OK 74872 | Oil & Gas Operator | Apr 2025 |
| 1497 | Hudgens Lester E | Bartlesville, OK 74006-0215 | Oil Operator | Mar 2015 |
| 1498 | Hudgens Operating Co., Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 1995 |
| 1499 | Hudson Brothers Mining Co., Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 1994 |
| 1500 | Hudson Brothers, Inc. | Hutchinson, KS 67501 | Oil & Gas Operator | Jun 2007 |