| 1 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 2 | H2ok LLC | Marble Falls, TX 78654 | Oil & Gas Operator | Mar 2025 |
| 3 | Hadson Petro USA Inc | | Oil & Gas Operator | Nov 2016 |
| 4 | Halcon Holdings Inc | Ada, OK 74820 | Oil & Gas Operator | Nov 2018 |
| 5 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 6 | Hallum Construction Inc | Seminole, OK 74868-2427 | Oil & Gas Operator | Sep 2014 |
| 7 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Jan 2025 |
| 8 | Hamil Oil & Gas LLC | Kingfisher, OK 73750-6500 | Oil & Gas Operator | Feb 2025 |
| 9 | Hamon Operating Company | Dallas, TX 75201 | Oil & Gas Operator | Dec 2011 |
| 10 | Harbor Resources LLC | Oklahoma City, OK 73120 | Oil & Gas Operator | Jun 2025 |
| 11 | Harding & Shelton Inc | Oklahoma City, OK 73104-2410 | Oil & Gas Operator | Feb 2025 |
| 12 | Harding And Shelton Exploration LLC | Oklahoma City, OK 73101-1557 | Oil & Gas Operator | Feb 2025 |
| 13 | Harken Exploration Company | Houston, TX 77079 | Oil & Gas Operator | Mar 2008 |
| 14 | Hazelwood Louis J | Albuquerque, NM 87111-6870 | Oil & Gas Operator | Feb 2023 |
| 15 | Hazelwood Prod & Exp Co LLC | Oklahoma City, OK 73116-9037 | Oil & Gas Operator | Jan 2025 |
| 16 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 17 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 18 | Helke Exploration Company | Oklahoma City, OK 73112-7201 | Oil & Gas Operator | Feb 2000 |
| 19 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Feb 2025 |
| 20 | Hennessey Oil & Gas LLC | Hennessey, OK 73742-0212 | Oil & Gas Operator | Sep 2024 |
| 21 | Henry Gungoll Operating Inc | Enid, OK 73703 | Oil & Gas Operator | Mar 2025 |
| 22 | Hep Oil Company LTD | Gainesville, TX 76240 | Oil & Gas Operator | Mar 2012 |
| 23 | Hep Oil GP, LLC | Gainesville, TX 76241 | Oil & Gas Operator | Mar 2015 |
| 24 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jun 2025 |
| 25 | Hibbert R E Estate Of | Houston, TX 77002-3211 | Oil & Gas Operator | Apr 2015 |
| 26 | High Energy | Cushing, OK 74023 | Oil & Gas Operator | Feb 2025 |
| 27 | Hillside Resources | Bartlesville, OK 74005 | Oil & Gas Operator | Jan 2007 |
| 28 | Himco Oil & Gas, Inc. | Enid, OK 73702 | Oil & Gas Operator | Feb 2025 |
| 29 | Hinkle Engineering, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Nov 2016 |
| 30 | Hodgden Operating Co., Inc. | Enid, OK 73702 | Oil & Gas Operator | Mar 2025 |
| 31 | Hodge T F | Fort Worth, TX 76102 | Oil & Gas Operator | Apr 2007 |
| 32 | Hoge Oil & Gas Expl Inc | Edmond, OK 73013-3709 | Oil & Gas Operator | Sep 2023 |
| 33 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Feb 2025 |
| 34 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Jun 2025 |
| 35 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 36 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Oct 2024 |
| 37 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 38 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 39 | Hovas Enterprises | Perkins, OK 74059 | Oil & Gas Operator | Mar 2014 |
| 40 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 41 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Jun 2025 |
| 42 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 43 | Huitt Joe A | Tulsa, OK 74103 | Oil & Gas Operator | May 2001 |
| 44 | Hulen Operating Company | Nichols Hill, OK 73116 | Oil & Gas Operator | Jun 2025 |
| 45 | Hungerford Oil & Gas Inc | Helena, OK 73741 | Oil & Gas Operator | Nov 2000 |
| 46 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Jun 2025 |
| 47 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 48 | Hunton Operating LLC | Oklahoma City, OK 73154 | Oil & Gas Operator | Mar 2025 |
| 49 | Husky Ventures Inc | Oklahoma City, OK 73134 | Oil & Gas Operator | Feb 2025 |
| 50 | Hux Oil Company LLC | Kingfisher, OK 73750 | Oil & Gas Operator | Mar 2025 |
| 51 | Hyalite Energy Corporation | Pampa, TX 79066 | Oil & Gas Operator | Feb 2025 |