| 701 | HDH Resources, Inc. | Wilmore, KS 67155 | Oil & Gas Operator | Jul 2025 |
| 702 | HDS Production | | Oil Operator | Mar 1998 |
| 703 | HDT Inc. | | Oil & Gas Operator | Nov 2025 |
| 704 | Headington Canada Corp. | Dallas, TX 75231 | Gas Operator | Jun 2000 |
| 705 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 706 | Headington Energy Partners, LLC | Corpus Chrsti, TX 78401 | Oil & Gas Operator | Dec 2025 |
| 707 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 708 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 709 | Headington Oil Company, L.P. | Dallas, TX 75231 | Oil & Gas Operator | Mar 2008 |
| 710 | Headline Resources, Inc. | Richardson, TX 75080 | Oil & Gas Operator | Aug 1997 |
| 711 | Headwaters Energy Partners, LLC | Dripping SPGS, TX 78620 | Oil & Gas Operator | Dec 2025 |
| 712 | Headwaters Oil Company | | Oil & Gas Operator | Oct 1981 |
| 713 | Heape Exploration, Inc. | Dallas, TX 75367 | Oil & Gas Operator | Dec 2020 |
| 714 | Heape, Gene G. | Dallas, TX 75367 | Oil & Gas Operator | Jun 2003 |
| 715 | Hearn Oil Co. LLC | Newport, OH 45768 | Oil & Gas Operator | Dec 2024 |
| 716 | Heart Land Petroleum Corporation | Abilene, TX 79604 | Oil & Gas Operator | Mar 2008 |
| 717 | Heartland Energy Company | Big Horn, WY 82833 | Gas Operator | Jun 2012 |
| 718 | Heartland Energy Corp | Rockville, MD 208531658 | Gas Operator | Jun 1997 |
| 719 | Heartland Enterprises, Incorporated | Phillipsburg, KS 67661 | Oil Operator | May 2005 |
| 720 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 721 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 722 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 723 | Heartland Oil & Gas Inc. | Gypsum, KS 67448 | Gas Operator | Jun 2011 |
| 724 | Heartland Production, Inc. | Cuero, TX 77954 | Oil & Gas Operator | Dec 2025 |
| 725 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Nov 2025 |
| 726 | Heartland Resources, Inc. | Temple, TX 76501 | Oil & Gas Operator | Mar 2008 |
| 727 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 728 | Heat Can Oil, LLC | Chanute, KS 66720 | Oil Operator | Jun 2009 |
| 729 | Heat Controller Inc | Jackson, MI 49204 | Oil & Gas Operator | Dec 1996 |
| 730 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 731 | Heath 91 Cluster LP | Commodore, PA 15729-9109 | Gas Operator | Dec 2020 |
| 732 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 733 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Oct 2025 |
| 734 | Heath, Chad | Greensburg, KY 42743 | Oil Operator | Dec 2023 |
| 735 | Heath, Francis A. & Ruth E. | South Dayton, NY 14138 | Gas Operator | Dec 2024 |
| 736 | Heath, Mark | Leoti, KS 67861 | Oil Operator | Nov 2009 |
| 737 | Heather & Randy Iantorno Oil | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2024 |
| 738 | Heatherly, Darl H. | Belington, WV 26250 | Gas Operator | Dec 2021 |
| 739 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 740 | Hebert & Rucks L.L.C. | | Oil & Gas Operator | May 2002 |
| 741 | Hebron Energy, LLC | Dallas, TX 75206 | Oil Operator | Jul 2018 |
| 742 | Hebron Pipeline | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |
| 743 | Hec Petroleum, Inc | Midland, TX 79705 | Oil & Gas Operator | Mar 2006 |
| 744 | Hedges Spencer | Casper, WY 82604 | Oil Operator | Mar 2024 |
| 745 | Hedrick Production Inc. | Corpus Chrsti, TX 78403 | Oil & Gas Operator | Dec 2025 |
| 746 | Hedrick, Thomasine | Severy, KS 67137 | Oil Operator | May 2011 |
| 747 | Heflin, Bryan Exploration, Inc. | Strawn, TX 76475 | Oil & Gas Operator | Mar 2008 |
| 748 | Heger J J & Asso | | Oil Operator | Jun 1983 |
| 749 | Hegwald, Jacob L. | Humboldt, KS 66748 | Oil Operator | Nov 2019 |
| 750 | Hehns Quality Gardens Inc | Wadsworth, OH 44281 | Oil & Gas Operator | Dec 2024 |
| 751 | Heifer Production Company LLC | Houston, TX 77098 | Oil & Gas Operator | Dec 2025 |
| 752 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Dec 2025 |
| 753 | Heim, William J. | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 754 | Heineman, Ronald F. | Caledonia, NY 14423 | Gas Operator | Dec 2024 |
| 755 | Heinrich Enterprises Inc Dba Washington Operations | Reno, OH 45773 | Oil & Gas Operator | Dec 2024 |
| 756 | Heinrich Enterprises, Inc. | Reno, OH 45773-0305 | Oil & Gas Operator | Dec 2021 |
| 757 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 758 | Heintz Gas & Oil Company, Inc. | Allegany, NY 14706 | Gas Operator | Dec 2024 |
| 759 | Heisey Ventures, Inc. | Houston, TX 77019 | Oil & Gas Operator | Dec 2025 |
| 760 | Helberg Oil Comp | | Oil Operator | Mar 1995 |
| 761 | Helbing & Podpechan | Clarence, OK 74018 | Oil & Gas Operator | May 1983 |
| 762 | Helbing & Robert | | Oil & Gas Operator | Feb 1991 |
| 763 | Held By Producti | | Oil & Gas Operator | Feb 1995 |
| 764 | Held By Production, Inc. | Houston, TX 77251 | Oil & Gas Operator | May 1996 |
| 765 | Helemrich & Payne Inc | Iraan, TX 79744 | Oil & Gas Operator | Sep 2002 |
| 766 | Helena Production Corp | | Oil & Gas Operator | Dec 1991 |
| 767 | Helena Resources Inc | Lakewood, CO 80215 | Oil & Gas Operator | Oct 2025 |
| 768 | Helena Resources LLC | Helena, OK 73741 | Oil & Gas Operator | Nov 2025 |
| 769 | Helios Operating, LLC | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 770 | Helis Oil & Gas Company LLC Estate | New Orleans, LA 70130 | Oil & Gas Operator | Jul 2022 |
| 771 | Helis Oil & Gas Company, L.L.C. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2023 |
| 772 | Helis, William G. Co., LLC, The | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2003 |
| 773 | Helis,WM.G.,Est., A Partnership | New Orleans, LA 70130 | Oil & Gas Operator | Aug 2003 |
| 774 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 775 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 776 | Hellar Drilling Company, Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jan 2009 |
| 777 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Oct 2025 |
| 778 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Oct 2025 |
| 779 | Hellifino Operating, LLC | San Antonio, TX 78212 | Oil Operator | Dec 2025 |
| 780 | Hellman Properties LLC | | Oil & Gas Operator | Nov 2025 |
| 781 | Hellums, Harold | Cedar Creek, TX 78612 | Oil & Gas Operator | Mar 2008 |
| 782 | Helm Energy Company | Tulsa, OK 74133 | Oil Operator | Sep 2025 |
| 783 | Helmcamp, Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Apr 2002 |
| 784 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 785 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 786 | Helmer Energy & Stanton Engr. | Tyler, TX 75702 | Oil & Gas Operator | Jun 1998 |
| 787 | Helmer Oil Corporation | | Oil & Gas Operator | Oct 2025 |
| 788 | Helmer, Bonnie J | | Oil Operator | Oct 2025 |
| 789 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 790 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2025 |
| 791 | Helmhold Oil Incorporated | Wellsville, NY 14895 | Oil Operator | Dec 2024 |
| 792 | Helms Oil | Brinkhaven, OH 43006 | Oil Operator | Dec 2018 |
| 793 | Helms Oil & Gas, LLC | Midland, TX 79710 | Oil & Gas Operator | Dec 2025 |
| 794 | Helo Energy, Inc. | Borger, TX 79008 | Oil & Gas Operator | Aug 2001 |
| 795 | Helsel, Allan J | South Haven, KS 67140 | Oil Operator | Aug 2025 |
| 796 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 797 | Helton Petroleum | Pampa, TX 79066 | Oil & Gas Operator | Dec 2025 |
| 798 | Helton, Pat A. & Alberta | Allison, TX 79003 | Oil & Gas Operator | Dec 2025 |
| 799 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 800 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Oct 2025 |