| 13501 | Hopewell Oil & Gas Development Company | Columbus, OH 43228 | Oil & Gas Operator | Dec 2019 |
| 13502 | Hopewell Operating, Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2026 |
| 13503 | Hopkins Engineering, Inc. | Houston, TX 77046 | Oil & Gas Operator | Sep 1996 |
| 13504 | Hopkins, T. M. Operating Co. | Kilgore, TX 75663 | Oil & Gas Operator | Mar 2026 |
| 13505 | Hoppe Oil & Gas | | Oil Operator | Nov 1992 |
| 13506 | Hoppe Oil & Gas Co., Inc. | Wichita, KS 67202 | Oil Operator | Jul 1998 |
| 13507 | Hopper Oil Co., Inc. | Winfield, KS 67156 | Oil Operator | Jul 2025 |
| 13508 | Hopper Oil Compa | | Oil Operator | Sep 1988 |
| 13509 | Hopper, Harlan | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 13510 | Hopper, Thornton Co. | Midland, TX 79702 | Oil & Gas Operator | Mar 2026 |
| 13511 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 13512 | Horadam, Henry L. | Victoria, TX 77905 | Oil & Gas Operator | Oct 2008 |
| 13513 | Horan, Ken L. | Cross Plains, TX 76443 | Gas Operator | May 2002 |
| 13514 | Horansky Burrell Revocable Trust | Wichita Falls, TX 76309 | Oil Operator | Mar 2026 |
| 13515 | Horany, Ray & Ernest | Olney, TX 76374 | Oil & Gas Operator | May 2002 |
| 13516 | Horizon Barnsdall Energy Part LTD I Osage Only | | Oil Operator | Feb 2012 |
| 13517 | Horizon Energy | Vergas, MN 56587 | Oil & Gas Operator | Sep 2025 |
| 13518 | Horizon Energy Corporation | Sand Fork, WV 26430 | Oil & Gas Operator | Dec 2021 |
| 13519 | Horizon Expl. & Dev. Co., Inc. | | Oil & Gas Operator | Jun 1995 |
| 13520 | Horizon Exploration Company | Houston, TX 77019 | Oil & Gas Operator | Aug 2002 |
| 13521 | Horizon Exploration Services | El Paso, TX 79922 | Oil Operator | Mar 2026 |
| 13522 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 13523 | Horizon Natural Gas, LLC | | Oil & Gas Operator | Dec 2018 |
| 13524 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 13525 | Horizon Oil & Ga | | Oil & Gas Operator | Jan 1992 |
| 13526 | Horizon Oil & Gas Co. | Dallas, TX 75221 | Oil & Gas Operator | Jan 2005 |
| 13527 | Horizon Operating Co. | | Oil & Gas Operator | Dec 1995 |
| 13528 | Horizon Prod. And Operating, LLC | Houston, TX 77019 | Oil & Gas Operator | Mar 2026 |
| 13529 | Horizon Resources Inc | Fort Worth, TX 76101-1978 | Oil & Gas Operator | Jul 2006 |
| 13530 | Horizon Ridge Oil Company | Austin, TX 78738 | Oil Operator | Mar 2026 |
| 13531 | Horizon Well Services, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Mar 2026 |
| 13532 | Horizontal Development & Production Inc | Lubbock, TX 79493 | Oil & Gas Operator | Jul 2002 |
| 13533 | Horn Eddie L Dba B & E Investments | Bristow, OK 74010 | Oil & Gas Operator | Dec 2025 |
| 13534 | Horn Energy | Eastland, TX 76448 | Oil & Gas Operator | Mar 2026 |
| 13535 | Horn Oil Company | Bristow, OK 74010 | Oil & Gas Operator | Dec 2025 |
| 13536 | Horn R L & Sons Drilling | | Oil Operator | Jun 1997 |
| 13537 | Horn, Henry L | | Oil Operator | Apr 2009 |
| 13538 | Horn, Tom D. | Pampa, TX 79066 | Gas Operator | Nov 2013 |
| 13539 | Horn, W. J. | Graham, TX 76450 | Oil & Gas Operator | Oct 2004 |
| 13540 | Horne & Moore Oil Co. | Holliday, TX 76366 | Oil & Gas Operator | Feb 2001 |
| 13541 | Horner Oil And Gas Production, Inc. | Cameron, WV 26033 | Oil & Gas Operator | Dec 2021 |
| 13542 | Horner Richard R | | Gas Operator | May 1995 |
| 13543 | Horning, Jeremiah | Penn Yan, NY 14527 | Gas Operator | Dec 2024 |
| 13544 | Horseshoe Oil Co | Cromwell, OK 74837 | Oil & Gas Operator | Dec 2021 |
| 13545 | Horseshoe Operating Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2023 |
| 13546 | Horseshoe Production, LLC | Bryson, TX 76427 | Oil & Gas Operator | Mar 2026 |
| 13547 | Horst Energy LLC | Fort Worth, TX 76124 | Oil & Gas Operator | Jun 2019 |
| 13548 | Horst Oil, LLC | Pittsburg, MO 65724 | Oil Operator | Dec 2009 |
| 13549 | Hortin & Huffman Pet Geol | Worthington, OH 43085 | Oil & Gas Operator | Dec 2000 |
| 13550 | Horton & Freeman | | Oil Operator | Apr 1983 |
| 13551 | Horton Mary | Ratliff City, OK 73481 | Oil Operator | May 2020 |
| 13552 | Horton Oil Company | Independence, KS 67301 | Oil & Gas Operator | Jul 2000 |
| 13553 | Horton, Jack | Independence, KS 67301 | Oil & Gas Operator | Aug 2015 |
| 13554 | Horton, John | Sedan, KS 67361 | Oil & Gas Operator | Sep 2025 |
| 13555 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 13556 | Hosford Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Feb 1994 |
| 13557 | Hosston Oil Inc. | | Oil Operator | Dec 1993 |
| 13558 | Hot Rod Oil | Vernal, UT 84078 | Oil & Gas Operator | Jan 2026 |
| 13559 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 13560 | Hottel Glenn D | W Salem, OH 44287 | Oil & Gas Operator | Dec 1993 |
| 13561 | Hottel Oil & Gas LLC | Wooster, OH 44691-7639 | Oil & Gas Operator | Dec 2013 |
| 13562 | Hotulke Construction LLC | Seminole, OK 74868 | Oil & Gas Operator | Dec 2025 |
| 13563 | Hou-Tex Oil And Gas | | Oil & Gas Operator | Jul 1982 |
| 13564 | Hou-Tex, Inc. | Houston, TX 77224 | Oil & Gas Operator | Jun 2001 |
| 13565 | Houchin, O. E. Inc. | Olney, IL 62450 | Oil & Gas Operator | Feb 1997 |
| 13566 | Hough Oil And Gas | Hominy, OK 74035 | Oil Operator | Dec 2025 |
| 13567 | Houghton Investments LLC | Columbus, OH 43235 | Oil & Gas Operator | Dec 2024 |
| 13568 | Houghton Oil & Gas, Inc. | Midland, TX 79701 | Oil & Gas Operator | Mar 2009 |
| 13569 | Houma Operating Company, Inc. | | Oil & Gas Operator | Jun 1998 |
| 13570 | Houma Salt Water Disposal Corp | | Oil Operator | Dec 2020 |
| 13571 | Hound Resources LLC | | Oil & Gas Operator | Dec 2025 |
| 13572 | Hounds Oil & Gas LLC | Carbon Hill, OH 43111 | Oil & Gas Operator | Dec 2024 |
| 13573 | House Thomas J | | Oil Operator | Dec 2025 |
| 13574 | House, Dustin | Shawnee, KS 66218 | Oil Operator | Sep 2025 |
| 13575 | Houseco Petroleum Inc | Bristow, OK 74010-0842 | Oil & Gas Operator | Aug 2002 |
| 13576 | Householder Oil Co | Junction City, OH 43748 | Oil & Gas Operator | Dec 1988 |
| 13577 | Houseknecht Oil Producers Inc | | Oil & Gas Operator | Dec 1994 |
| 13578 | Housel John R Jr | | Oil Operator | Oct 1994 |
| 13579 | Housel, Robert E. | Cherryvale, KS 67335 | Oil & Gas Operator | Dec 2003 |
| 13580 | Houser, R. G. | | Oil Operator | Mar 1953 |
| 13581 | Houston Energy & Dev. Inc. | | Oil & Gas Operator | Apr 1994 |
| 13582 | Houston Energy Operating, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jul 2020 |
| 13583 | Houston Energy, L.P. | Houston, TX 77002 | Oil & Gas Operator | Jan 2014 |
| 13584 | Houston Expl. & Prod. Co., Inc. | Austin, TX 78746 | Oil & Gas Operator | Aug 2003 |
| 13585 | Houston Exploration Co, The | Houston, TX 77002 | Oil & Gas Operator | Apr 2017 |
| 13586 | Houston Gulf Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Mar 2026 |
| 13587 | Houston Hydrocarbons, Inc. (A) | Houston, TX 77042 | Oil & Gas Operator | Sep 2004 |
| 13588 | Houston Hydrolan | | Oil Operator | Jul 1984 |
| 13589 | Houston Oil & Gas Company, Inc. | Houston, TX 77063 | Oil & Gas Operator | Aug 1995 |
| 13590 | Houston Oil & Minerals Corp. | Houston, TX 77002 | Oil & Gas Operator | Aug 1996 |
| 13591 | Houston Oil And Minerals | | Oil & Gas Operator | Oct 1993 |
| 13592 | Houston Oil Fields Company | | Oil & Gas Operator | Apr 1987 |
| 13593 | Houston Oil Prod Enterprises,Inc | Houston, TX 77006 | Oil & Gas Operator | Mar 2026 |
| 13594 | Houston Operating, Inc. | Houston, TX 77027 | Oil & Gas Operator | Mar 2026 |
| 13595 | Houston Petroleum Company | Houston, TX 77027 | Oil & Gas Operator | Mar 2026 |
| 13596 | Houston Production Corporation | | Oil & Gas Operator | Jan 2004 |
| 13597 | Houston Resources Corp. | Houston, TX 77002 | Oil & Gas Operator | Apr 2003 |
| 13598 | Houtchens, D. D. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2026 |
| 13599 | Houtchens, DD & Anna D LVNG TRST | Garland, TX 75043 | Oil Operator | Jun 2025 |
| 13600 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |