| 13501 | Horizon Natural Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 13502 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 13503 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 13504 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 13505 | Horizon Operating Co. | | Oil & Gas Operator | Dec 1995 |
| 13506 | Horizon Prod. And Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Sep 2025 |
| 13507 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 13508 | Horizon Ridge Oil Company | Austin, TX 78738 | Oil Operator | Sep 2025 |
| 13509 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2025 |
| 13510 | Horizontal Development & Production Inc | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2002 |
| 13511 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 13512 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Sep 2025 |
| 13513 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Jun 2025 |
| 13514 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 13515 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 13516 | Horn, W. J. | Graham, TX 76450 | Oil & Gas Operator | Oct 2004 |
| 13517 | Horne & Moore Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2001 |
| 13518 | Horner Oil And Gas Production, Inc. | Cameron, WV 26033 | Oil & Gas Operator | Dec 2021 |
| 13519 | Horner Richard R | | Gas Operator | May 1995 |
| 13520 | Horning, Jeremiah | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 13521 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 13522 | Horseshoe Operating Inc | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 13523 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil Operator | Sep 2025 |
| 13524 | Horst Energy LLC | Fort Worth, TX 76124 | Oil & Gas Operator | Jun 2019 |
| 13525 | Horst Oil, LLC | Pittsburg, MO 65724 | Oil Operator | Dec 2009 |
| 13526 | Hortin & Huffman Pet Geol | Worthington, OH 43085 | Oil & Gas Operator | Dec 2000 |
| 13527 | Horton & Freeman | | Oil Operator | Apr 1983 |
| 13528 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 13529 | Horton Oil Company, Inc. | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 13530 | Horton, Jack | Independence, KS 67301 | Oil & Gas Operator | Aug 2015 |
| 13531 | Horton, John | Sedan, KS 67361 | Oil & Gas Operator | May 2025 |
| 13532 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 13533 | Hoselton, Earlie And Caroline | Ravenswood, WV 26164-8753 | Gas Operator | Dec 2021 |
| 13534 | Hosford Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 1994 |
| 13535 | Hosston Oil Inc. | | Oil Operator | Dec 1993 |
| 13536 | Hot Rod Oil | Vernal, UT 84078 | Oil & Gas Operator | Jun 2025 |
| 13537 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 13538 | Hottel Glenn D | W Salem, OH 44287 | Oil & Gas Operator | Dec 1993 |
| 13539 | Hottel Oil & Gas LLC | Wooster, OH 44691-7639 | Oil & Gas Operator | Dec 2013 |
| 13540 | Hotulke Construction LLC | Seminole, OK 74868 | Oil & Gas Operator | Jun 2025 |
| 13541 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 13542 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 13543 | Houchin, O. E. Inc. | Olney, IL 62450 | Oil & Gas Operator | Feb 1997 |
| 13544 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Jun 2025 |
| 13545 | Houghton Investments LLC | Columbus, OH 43235 | Oil & Gas Operator | Dec 2024 |
| 13546 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 13547 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 13548 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 13549 | Hound Resources LLC | | Oil & Gas Operator | Jul 2025 |
| 13550 | Hounds Oil & Gas LLC | Carbon Hill, OH 43111 | Oil & Gas Operator | Dec 2024 |
| 13551 | House Thomas J | | Oil Operator | May 2025 |
| 13552 | House, Dustin | Shawnee, KS 66218 | Oil Operator | May 2025 |
| 13553 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 13554 | Householder Oil Co | Junction City, OH 43748 | Oil & Gas Operator | Dec 1988 |
| 13555 | Houseknecht Oil Producers Inc | | Oil & Gas Operator | Dec 1994 |
| 13556 | Housel John R Jr | | Oil Operator | Oct 1994 |
| 13557 | Housel, Robert E. | Cherryvale, KS 67335 | Oil & Gas Operator | Dec 2003 |
| 13558 | Houser, R. G. | | Oil Operator | Mar 1953 |
| 13559 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Apr 1994 |
| 13560 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 13561 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 13562 | Houston Expl. & Prod. Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Aug 2003 |
| 13563 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 13564 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Sep 2025 |
| 13565 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 13566 | Houston Hydrolan | | Oil Operator | Jul 1984 |
| 13567 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 13568 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 13569 | Houston Oil And Minerals | | Oil & Gas Operator | Oct 1993 |
| 13570 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 13571 | Houston Oil Prod Enterprises,Inc | Houston, TX 77006 | Oil & Gas Operator | Sep 2025 |
| 13572 | Houston Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 13573 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Sep 2025 |
| 13574 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 13575 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 13576 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Sep 2025 |
| 13577 | Houtchens, DD & Anna D LVNG TRST | Garland, TX 75043 | Oil Operator | Sep 2025 |
| 13578 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 13579 | Hovgard & Fitzgerald | Abilene, TX 79608 | Oil & Gas Operator | Mar 1996 |
| 13580 | Hovivian Gregory E | La Crescenta, CA 91214 | Gas Operator | Dec 1999 |
| 13581 | Howard & Taylor | Wynnewood, OK 73098-9234 | Oil & Gas Operator | Jun 2025 |
| 13582 | Howard Drilling Inc | Mount Jewett, PA 16740-0556 | Oil & Gas Operator | Dec 2024 |
| 13583 | Howard E. Caywood Inc. | | Oil & Gas Operator | Jul 2025 |
| 13584 | Howard Energy Co Inc | | Oil & Gas Operator | Aug 2011 |
| 13585 | Howard Exploration, Inc. | Houston, TX 77069 | Oil & Gas Operator | Sep 2025 |
| 13586 | Howard Operating Co. | Saint Jo, TX 76265 | Oil & Gas Operator | Sep 2025 |
| 13587 | Howard'S Well Service | | Oil Operator | Jul 2007 |
| 13588 | Howard, Anthony D | Philpot, KY 42366 | Oil Operator | Dec 2023 |
| 13589 | Howard, Anthony E. F. | Tyler, TX 75701 | Oil & Gas Operator | Jun 2001 |
| 13590 | Howard, Douglas J. | Houston, TX 77070 | Oil & Gas Operator | Mar 2008 |
| 13591 | Howard, Lorna Agent | | Oil & Gas Operator | Dec 2021 |
| 13592 | Howard, Patrick M. | Eden, NY 14057 | Gas Operator | Dec 2024 |
| 13593 | Howard, Terry | Cherry Creek, NY 14723 | Gas Operator | Dec 2024 |
| 13594 | Howco Oil And Gas | Stroud, OK 74079-9604 | Oil & Gas Operator | Mar 2015 |
| 13595 | Howden Petroleum Corp | Wetumka, OK 74883 | Gas Operator | Nov 1997 |
| 13596 | Howdyshell Pumping Inc | Logan, OH 43138 | Oil Operator | Dec 2024 |
| 13597 | Howe, Thomas L. | Hunt, NY 14846 | Gas Operator | Dec 2024 |
| 13598 | Howell & Sandlin, Inc. | Marshall, TX 75671 | Oil & Gas Operator | Jan 2001 |
| 13599 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 13600 | Howell C W | Wichita Falls, TX 76308 | Oil & Gas Operator | Apr 2015 |