| 1401 | Horizon Expl. & Dev. Co., Inc. | | Oil & Gas Operator | Jun 1995 |
| 1402 | Horizon Exploration Company | Houston, TX 77019 | Oil & Gas Operator | Aug 2002 |
| 1403 | Horizon Exploration Services | El Paso, TX 79922 | Oil Operator | Feb 2026 |
| 1404 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 1405 | Horizon Natural Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 1406 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 1407 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 1408 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 1409 | Horizon Operating Co. | | Oil & Gas Operator | Dec 1995 |
| 1410 | Horizon Prod. And Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Feb 2026 |
| 1411 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 1412 | Horizon Ridge Oil Company | Austin, TX 78738 | Oil Operator | Feb 2026 |
| 1413 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Feb 2026 |
| 1414 | Horizontal Development & Production Inc | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2002 |
| 1415 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 1416 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Feb 2026 |
| 1417 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Nov 2025 |
| 1418 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 1419 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 1420 | Horn, Tom D. | Pampa, TX 79066 | Gas Operator | Nov 2013 |
| 1421 | Horn, W. J. | Graham, TX 76450 | Oil & Gas Operator | Oct 2004 |
| 1422 | Horne & Moore Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2001 |
| 1423 | Horner Oil And Gas Production, Inc. | Cameron, WV 26033 | Oil & Gas Operator | Dec 2021 |
| 1424 | Horner Richard R | | Gas Operator | May 1995 |
| 1425 | Horning, Jeremiah | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 1426 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 1427 | Horseshoe Operating Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 1428 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil & Gas Operator | Feb 2026 |
| 1429 | Horst Energy LLC | Fort Worth, TX 76124 | Oil & Gas Operator | Jun 2019 |
| 1430 | Horst Oil, LLC | Pittsburg, MO 65724 | Oil Operator | Dec 2009 |
| 1431 | Hortin & Huffman Pet Geol | Worthington, OH 43085 | Oil & Gas Operator | Dec 2000 |
| 1432 | Horton & Freeman | | Oil Operator | Apr 1983 |
| 1433 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 1434 | Horton Oil Company | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 1435 | Horton, Jack | Independence, KS 67301 | Oil & Gas Operator | Aug 2015 |
| 1436 | Horton, John | Sedan, KS 67361 | Oil & Gas Operator | Sep 2025 |
| 1437 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 1438 | Hosford Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 1994 |
| 1439 | Hosston Oil Inc. | | Oil Operator | Dec 1993 |
| 1440 | Hot Rod Oil | Vernal, UT 84078 | Oil & Gas Operator | Jan 2026 |
| 1441 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 1442 | Hottel Glenn D | W Salem, OH 44287 | Oil & Gas Operator | Dec 1993 |
| 1443 | Hottel Oil & Gas LLC | Wooster, OH 44691-7639 | Oil & Gas Operator | Dec 2013 |
| 1444 | Hotulke Construction LLC | Seminole, OK 74868 | Oil & Gas Operator | Nov 2025 |
| 1445 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 1446 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 1447 | Houchin, O. E. Inc. | Olney, IL 62450 | Oil & Gas Operator | Feb 1997 |
| 1448 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Nov 2025 |
| 1449 | Houghton Investments LLC | Columbus, OH 43235 | Oil & Gas Operator | Dec 2024 |
| 1450 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 1451 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 1452 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 1453 | Hound Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 1454 | Hounds Oil & Gas LLC | Carbon Hill, OH 43111 | Oil & Gas Operator | Dec 2024 |
| 1455 | House Thomas J | | Oil Operator | Dec 2025 |
| 1456 | House, Dustin | Shawnee, KS 66218 | Oil Operator | Sep 2025 |
| 1457 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 1458 | Householder Oil Co | Junction City, OH 43748 | Oil & Gas Operator | Dec 1988 |
| 1459 | Houseknecht Oil Producers Inc | | Oil & Gas Operator | Dec 1994 |
| 1460 | Housel John R Jr | | Oil Operator | Oct 1994 |
| 1461 | Housel, Robert E. | Cherryvale, KS 67335 | Oil & Gas Operator | Dec 2003 |
| 1462 | Houser, R. G. | | Oil Operator | Mar 1953 |
| 1463 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Apr 1994 |
| 1464 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 1465 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 1466 | Houston Expl. & Prod. Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Aug 2003 |
| 1467 | Houston Exploration Company | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 1468 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 2026 |
| 1469 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 1470 | Houston Hydrolan | | Oil Operator | Jul 1984 |
| 1471 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 1472 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 1473 | Houston Oil And Minerals | | Oil & Gas Operator | Oct 1993 |
| 1474 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 1475 | Houston Oil Prod Enterprises,Inc | Houston, TX 77006 | Oil & Gas Operator | Feb 2026 |
| 1476 | Houston Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 1477 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Feb 2026 |
| 1478 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 1479 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 1480 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Feb 2026 |
| 1481 | Houtchens, DD & Anna D LVNG TRST | Garland, TX 75043 | Oil Operator | Jun 2025 |
| 1482 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 1483 | Hovgard & Fitzgerald | Abilene, TX 79608 | Oil & Gas Operator | Mar 1996 |
| 1484 | Hovivian Gregory E | La Crescenta, CA 91214 | Gas Operator | Dec 1999 |
| 1485 | Howard & Taylor | Wynnewood, OK 73098 | Oil & Gas Operator | Nov 2025 |
| 1486 | Howard Drilling Inc | Mount Jewett, PA 16740-0556 | Oil & Gas Operator | Dec 2025 |
| 1487 | Howard E. Caywood Inc. | | Oil & Gas Operator | Dec 2025 |
| 1488 | Howard Energy Co Inc | | Oil & Gas Operator | Aug 2011 |
| 1489 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Feb 2026 |
| 1490 | Howard Operating Co. | Saint Jo, TX 76265 | Oil & Gas Operator | Feb 2026 |
| 1491 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 1492 | Howard, Anthony D | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 1493 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 1494 | Howard, Douglas J. | Houston, TX 77070 | Oil & Gas Operator | Mar 2008 |
| 1495 | Howard, Lorna Agent | | Oil & Gas Operator | Dec 2021 |
| 1496 | Howard, Patrick M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 1497 | Howard, Terry | Cherry Creek, NY 14723 | Gas Operator | Dec 2024 |
| 1498 | Howco Energy, Inc. | Whitesboro, TX 76273 | Oil & Gas Operator | Jun 2000 |
| 1499 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 1500 | Howden Petroleum Corp | Wetumka, OK 74883 | Gas Operator | Nov 1997 |