| 2601 | HCL Inc | Woodward, OK 73802-1074 | Oil Operator | Mar 2015 |
| 2602 | HCM | Dallas, TX 75206 | Oil & Gas Operator | Mar 2015 |
| 2603 | Headington Energy Corporation | | Oil & Gas Operator | Aug 1992 |
| 2604 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 2605 | Headington Oil Company LLC | Dallas, TX 75204 | Oil & Gas Operator | Apr 2016 |
| 2606 | Heartland Environmental Services | Watonga, OK 73080 | Oil & Gas Operator | May 1999 |
| 2607 | Heartland Exploration | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2000 |
| 2608 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 2609 | Heartland Pumping | Hennessey, OK 73742-7311 | Oil & Gas Operator | Aug 2025 |
| 2610 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 2611 | Heat Waves Hot Oil Service LLC | Denver, CO 80202 | Oil Operator | Jun 2011 |
| 2612 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 2613 | Heath Oil Co., Inc. | Washington, OK 73093-4702 | Oil & Gas Operator | Aug 2025 |
| 2614 | Heaton Everill L | Exeter, CA 93221-2340 | Oil & Gas Operator | Sep 2014 |
| 2615 | Heights Energy Corporation | Plano, TX 75026 | Oil & Gas Operator | Dec 2025 |
| 2616 | Heinrich Production Co Inc | Lubbuck, TX 79424 | Oil Operator | Dec 2024 |
| 2617 | Helena Resources LLC | Helena, OK 73741 | Oil & Gas Operator | Aug 2025 |
| 2618 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 2619 | Hellard Elmer J | Sapulpa, OK 74066 | Oil & Gas Operator | Sep 2025 |
| 2620 | Heller Phillip & Charlene | Columbia, MO 65201 | Oil & Gas Operator | Jul 2025 |
| 2621 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 2622 | Helmco Production Company | Pawhuska, OK 74056 | Oil Operator | Aug 2000 |
| 2623 | Helmer Oil Corporation | | Oil & Gas Operator | Aug 2025 |
| 2624 | Helmer, Bonnie J | | Oil Operator | Aug 2025 |
| 2625 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Aug 2025 |
| 2626 | Helton Oil Company | Edmond, OK 73083-7283 | Oil & Gas Operator | Aug 2016 |
| 2627 | Hembree Alva | Oklahoma City, OK 73151-9145 | Oil & Gas Operator | Jun 2016 |
| 2628 | Hembree Brit W | Shawnee, OK 74802-1725 | Oil & Gas Operator | Jun 2025 |
| 2629 | Hemstead Oil Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2001 |
| 2630 | Henderson Charles E | Bokoshe, OK 74930 | Gas Operator | Oct 2021 |
| 2631 | Henderson Don Inc | Oklahoma City, OK 73134-1753 | Oil & Gas Operator | Aug 2013 |
| 2632 | Henderson Exploration Company | Tulsa, OK 74120 | Oil & Gas Operator | May 2013 |
| 2633 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Aug 2025 |
| 2634 | Hendrickson Lester | Delaware, OK 74027-9715 | Oil Operator | Mar 2015 |
| 2635 | Hendrickson W R | Beggs, OK 74421-2936 | Oil & Gas Operator | Jun 2023 |
| 2636 | Henley, VIola F | | Oil Operator | Aug 2025 |
| 2637 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 2638 | Henry Billy Or Connie | Okemah, OK 74859-6075 | Oil & Gas Operator | Jul 2021 |
| 2639 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Sep 2025 |
| 2640 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 2641 | Henry Petroleum Inc | Oklahoma City, OK 73162-1757 | Oil & Gas Operator | Sep 2019 |
| 2642 | Henry Petroleum Of Oklahoma LP | Midland, TX 79703-5000 | Oil & Gas Operator | Feb 2017 |
| 2643 | Henry Rennick | | Oil Operator | Aug 2025 |
| 2644 | Henry Wat Oil Company | Tulsa, OK 74101 | Oil Operator | Jan 2014 |
| 2645 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |
| 2646 | Henson Terry Dba Daycon Exploration | Tulsa, OK 74137-3546 | Oil & Gas Operator | Jul 2025 |
| 2647 | Hep Oil Company, LTD. | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 2648 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 2649 | Heritage Exploration LLC | Oklahoma City, OK 73120-5622 | Oil & Gas Operator | Jan 2020 |
| 2650 | Heritage Oil Company Inc | Norman, OK 73070 | Oil & Gas Operator | Jul 2008 |
| 2651 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Dec 2025 |
| 2652 | Herrman & Ikenberry | Cushing, OK 74023-0247 | Oil & Gas Operator | Dec 2003 |
| 2653 | Herrmann Arnold | Chandler, OK 74834 | Oil & Gas Operator | Sep 2024 |
| 2654 | Herrmann J B Oil And Gas | Amarillo, TX 79159-0670 | Oil & Gas Operator | Feb 2015 |
| 2655 | Herv Oil, LLC | Oklahoma City, OK 73116 | Oil Operator | Sep 2025 |
| 2656 | Herzfeld Fabricators Inc. | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 2657 | Hess Corporation | Houston, TX 77010 | Oil & Gas Operator | Aug 2017 |
| 2658 | Hester Jr J C | Lawton, OK 73502-1887 | Oil & Gas Operator | Oct 1997 |
| 2659 | Heston Oil Company | Tulsa, OK 74108 | Oil & Gas Operator | Mar 2005 |
| 2660 | Heuston Oil LLC | Bartlesville, OK 74006 | Oil & Gas Operator | Apr 2020 |
| 2661 | Hewitt Energy Group Inc | Salt Lake City, UT 84111 | Oil & Gas Operator | Apr 2015 |
| 2662 | Hewitt, Douglas R | | Oil Operator | May 2025 |
| 2663 | Hexagon Oil And Gas Inc. | Fort Worth, TX 76132 | Oil & Gas Operator | Dec 2025 |
| 2664 | HGN Operating Company, Inc. | Abilene, TX 79604 | Oil & Gas Operator | Jul 2014 |
| 2665 | HHH & G Oil Co | Owasso, OK 74055 | Oil Operator | Jun 2020 |
| 2666 | HHL Development Inc | Garber, OK 73738 | Oil & Gas Operator | Aug 2025 |
| 2667 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 2668 | Hiawatha Exploration Company | Oklahoma City, OK 73116-7326 | Oil & Gas Operator | Mar 2009 |
| 2669 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 2670 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Jul 2025 |
| 2671 | High McDonald Operating Co | Norman, OK 73072-7607 | Oil Operator | Jul 2025 |
| 2672 | High Sierra Water Services Mid Continent LLC | Denver, CO 80209 | Oil Operator | Feb 2010 |
| 2673 | Highfill Bob W | Claremore, OK 74018-2595 | Oil Operator | Jun 2005 |
| 2674 | Highland Minerals Inc | Tulsa, OK 74145-7627 | Oil & Gas Operator | Apr 2015 |
| 2675 | Highland Oil & Gas LLC | Houston, TX 77079-7220 | Oil & Gas Operator | Feb 2015 |
| 2676 | Highmark Energy Operating LLC | Dallas, TX 75222 | Oil & Gas Operator | Dec 2025 |
| 2677 | Highmount Operating LLC | Oklahoma City, OK 73134 | Oil & Gas Operator | Nov 2014 |
| 2678 | Hightower Energy LLC | Cushing, OK 74023-6370 | Oil & Gas Operator | Sep 2025 |
| 2679 | Hightower Oil & Gas | Cairo, IL 62914-0401 | Oil Operator | Nov 2014 |
| 2680 | Highway 15 SWD LLC | Shattuck, OK 73858 | Oil Operator | Oct 2021 |
| 2681 | Highway 60 SWD LLC | Shattuck, OK 73858-0848 | Oil Operator | Jul 2019 |
| 2682 | Hikcott Oil | Wilson, OK 73463-6537 | Oil Operator | Jan 2014 |
| 2683 | Hill Gilford | Stroud, OK 74079-9401 | Oil & Gas Operator | May 2013 |
| 2684 | Hill John H | Dallas, TX 75240-7077 | Oil & Gas Operator | Jul 2015 |
| 2685 | Hill Oil Company Inc | Shawnee, OK 74804 | Oil & Gas Operator | Aug 2025 |
| 2686 | Hill Production Company | Kilgore, TX 75663 | Oil & Gas Operator | Feb 2009 |
| 2687 | Hill Resources Inc | | Oil & Gas Operator | Nov 2022 |
| 2688 | Hill Robert H & Willa F | Morris, OK 74445 | Oil & Gas Operator | Apr 2020 |
| 2689 | Hill William H | Broken Arrow, OK 74012-8952 | Oil & Gas Operator | Apr 2020 |
| 2690 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 2691 | Hilliard Oil & Gas, Inc. | New Orleans, LA 70112 | Oil & Gas Operator | May 2001 |
| 2692 | Hillin-Simon Oil Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2013 |
| 2693 | Hills Dozer Service | Stroud, OK 74079 | Oil & Gas Operator | Mar 2022 |
| 2694 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 2695 | Hilltop Disposal LLC | Elk City, OK 73644-2400 | Oil Operator | Jun 2021 |
| 2696 | Himco Oil & Gas Inc | Enid, OK 73702 | Oil & Gas Operator | Aug 2025 |
| 2697 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 2698 | Hinkle Oil And Gas Inc | Oklahoma City, OK 73112-4275 | Oil & Gas Operator | Sep 2025 |
| 2699 | Hinson Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Sep 2025 |
| 2700 | Hinson Jr Bobbie L | Bristow, OK 74010 | Oil & Gas Operator | Jul 2020 |