| 601 | Hrubetz Operating Company | Dallas, TX 75225 | Oil & Gas Operator | Feb 1999 |
| 602 | HS Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Sep 2002 |
| 603 | HTR Operating Co., Inc. | Hurst, TX 76053 | Oil & Gas Operator | Dec 2025 |
| 604 | Hub-Cap Oil Company | Arlington, TX 76016 | Oil & Gas Operator | Dec 2013 |
| 605 | Hubbard Operating | Ozona, TX 76943 | Gas Operator | Dec 2025 |
| 606 | Hubcap Oil, LLC | Boerne, TX 78015 | Oil Operator | Dec 2025 |
| 607 | Hubco Exploration Inc. | Houston, TX 77073 | Oil & Gas Operator | Sep 2002 |
| 608 | Huber Energy L.P. | Houston, TX 77079 | Oil & Gas Operator | Feb 2007 |
| 609 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 610 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Dec 2025 |
| 611 | Huddleston Oil And Gas Company | Millsap, TX 76066 | Gas Operator | Dec 2002 |
| 612 | Hudgens Operating Co., Inc. | Abilene, TX 79603 | Oil & Gas Operator | Jul 1995 |
| 613 | Hudson Brothers Mining Co., Inc. | Cisco, TX 76437 | Oil & Gas Operator | Jun 1994 |
| 614 | Hudson, Comer Oil & Gas | Cisco, TX 76437 | Oil & Gas Operator | Jan 2003 |
| 615 | Huff Minerals, LTD. | Amarillo, TX 79101 | Gas Operator | Dec 2025 |
| 616 | Huff, Jack | Midland, TX 79710 | Oil & Gas Operator | Dec 2004 |
| 617 | Huffman, H. L., LTD. | Fort Worth, TX 76113 | Oil & Gas Operator | Sep 1994 |
| 618 | Hufo Production Corporation | Midland, TX 79702 | Oil & Gas Operator | Jul 2002 |
| 619 | Huggs Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Apr 2003 |
| 620 | Hughes & Patterson Oper. Corp. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 621 | Hughes & Shawver | Olney, TX 76374 | Oil & Gas Operator | Aug 1996 |
| 622 | Hughes Legacy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2022 |
| 623 | Hughes Oil Company Inc | Odessa, TX 79765 | Oil & Gas Operator | Feb 2004 |
| 624 | Hughes Supplies, Inc. | Greenwood, LA 71033 | Oil & Gas Operator | Jul 2019 |
| 625 | Hughes, Bill Drilling, Inc. | Graham, TX 76450 | Oil & Gas Operator | Dec 2025 |
| 626 | Hughes, Bob Oil Company | San Angelo, TX 76901 | Oil & Gas Operator | Jul 2011 |
| 627 | Hughes, Dan A. Company | Beeville, TX 78104 | Oil & Gas Operator | May 2006 |
| 628 | Hughes, Dan A. Company, L.P. | Beeville, TX 78104 | Oil & Gas Operator | Dec 2025 |
| 629 | Hughey, Gaylord T. SR. Oper. Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 1998 |
| 630 | Hughey, W. R., Operating Co. | Tyler, TX 75711 | Oil & Gas Operator | Feb 2005 |
| 631 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 632 | Hugoton Operating Company, Inc. | Dallas, TX 75240 | Oil & Gas Operator | Dec 2025 |
| 633 | Hugus Investment Company, Inc. | Tyler, TX 75711 | Oil & Gas Operator | Dec 2025 |
| 634 | Huisache E & P Company, LLC | San Antonio, TX 78205 | Oil & Gas Operator | Mar 2017 |
| 635 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 636 | Hull Oil Co. | Wichita Falls, TX 76308 | Oil & Gas Operator | Sep 2021 |
| 637 | Hulse, J. T. | Archer City, TX 76351 | Oil & Gas Operator | Dec 2025 |
| 638 | Hulse, Tommy P. | Archer City, TX 76351 | Oil & Gas Operator | Feb 2009 |
| 639 | Hulsey Larry O & Co | Graham, TX 76046 | Oil & Gas Operator | Jun 2012 |
| 640 | Hulsey Oil Company | Dallas, TX 75205 | Oil & Gas Operator | Aug 1999 |
| 641 | Humak Processors, Inc. | Tyler, TX 75710 | Oil & Gas Operator | Aug 2005 |
| 642 | Humber Oil Company | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 643 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |
| 644 | Humedel Land & Minerals, Inc. | Jourdanton, TX 78026 | Oil & Gas Operator | Mar 2008 |
| 645 | Humphrey, Thos.D. Oil Prop.,Inc. | Gainesville, TX 76241 | Oil & Gas Operator | Aug 1999 |
| 646 | Humphrey-Bashford Oil, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Sep 2010 |
| 647 | Hunt Cimarron LTD. Partnership | Roswell, NM 88202 | Oil & Gas Operator | Dec 2025 |
| 648 | Hunt Industries, LTD. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2000 |
| 649 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 650 | Hunt Operating, LLC | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 651 | Hunt Petroleum (Aec), Inc. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 652 | Hunt Petroleum Corp. | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 653 | Hunt, Hassie Exploration Company | Dallas, TX 75201 | Oil & Gas Operator | Nov 2008 |
| 654 | Hunt, WM. Herbert, Trust Est. | Dallas, TX 75201 | Oil & Gas Operator | Sep 1998 |
| 655 | Hunter & Hedrick Production, Inc | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 1995 |
| 656 | Hunter & McDonald | Wichita Falls, TX 76309 | Oil & Gas Operator | Jul 2001 |
| 657 | Hunter Brothers | Wichita Falls, TX 76302 | Oil & Gas Operator | Jul 2007 |
| 658 | Hunter Energy, Inc. | Hurst, TX 76053 | Oil & Gas Operator | Dec 2025 |
| 659 | Hunter Oil & Gas Co. | Bangs, TX 76823 | Oil & Gas Operator | Dec 2025 |
| 660 | Hunter Oil Corporation | Gruver, TX 79040 | Gas Operator | Dec 2025 |
| 661 | Hunter Petroleum Inc. | Alice, TX 78333 | Oil & Gas Operator | May 2014 |
| 662 | Hunter, Rocquelle | Coleman, TX 76834 | Oil Operator | Dec 2025 |
| 663 | Hunters Creek Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Dec 2025 |
| 664 | Huntington Energy LLC | Nichols Hill, OK 73116 | Oil & Gas Operator | Dec 2025 |
| 665 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 666 | Huntland Properties, LTD. | Santa Anna, TX 76878 | Oil & Gas Operator | Dec 2025 |
| 667 | Huntwood Resources, LLC | Huntsville, TX 77340 | Oil Operator | Dec 2025 |
| 668 | Hurd Ent.LTD/U.S.Enercorp,LLC | San Antonio, TX 78209 | Oil & Gas Operator | Aug 2002 |
| 669 | Hurd Enterprises, LTD. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 670 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |
| 671 | Hurricane Oil And Gas Co., Inc. | Houston, TX 77057 | Oil & Gas Operator | Mar 2008 |
| 672 | Hurst Oil & Gas, Inc. | Hillsboro, TX 76645 | Oil & Gas Operator | Dec 2024 |
| 673 | Husfeld, Rose Marie | Bowie, TX 76230 | Oil & Gas Operator | Aug 2017 |
| 674 | Husfeld, Walter H. | Bowie, TX 76230 | Oil & Gas Operator | Jun 2007 |
| 675 | Huson Corp. | Albany, TX 76430 | Oil & Gas Operator | May 2003 |
| 676 | Huston Minerals LP | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 677 | Huston Oil | Woodson, TX 76491 | Oil & Gas Operator | Oct 2010 |
| 678 | HW Operating, LLC | Wichita Falls, TX 76308 | Oil & Gas Operator | Dec 2025 |
| 679 | HWH Production, LLC | Muenster, TX 76252 | Oil Operator | Dec 2025 |
| 680 | Hy-Tech, Inc. | Pampa, TX 79066 | Oil & Gas Operator | Feb 2017 |
| 681 | Hyalite Energy Corporation | Pampa, TX 79066 | Oil & Gas Operator | Oct 2025 |
| 682 | Hybrid Operating, Incorporated | Carlsbad, CA 92009 | Oil & Gas Operator | Dec 2025 |
| 683 | Hydroc Oil Company | Borger, TX 79007 | Oil & Gas Operator | May 2012 |
| 684 | Hydrocarbon Horizons, Inc. | Corpus Chrsti, TX 78473 | Oil & Gas Operator | Jun 2023 |
| 685 | Hydrocarbon Lease Management LTD | Addison, TX 75001 | Oil & Gas Operator | Jul 2002 |
| 686 | Hydrocarbon Management, Inc. | San Antonio, TX 78216 | Oil & Gas Operator | Dec 1996 |
| 687 | Hydrocarbon Operating, Inc. | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 688 | Hydrogeo, L.L.C. | Houston, TX 77074 | Oil & Gas Operator | Dec 2025 |
| 689 | Hyer,Na & CJ Aldenhoven Trusts | Lipan, TX 76462 | Gas Operator | Oct 2017 |
| 690 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |
| 691 | Hyperion Oil & Gas LLC | Dallas, TX 75251 | Oil & Gas Operator | Dec 2025 |
| 692 | Hyquest Energy, Inc. | Midland, TX 79710 | Oil & Gas Operator | Mar 2015 |