| 1 | H & K Oil Company | Kilgore, TX 75662 | Oil & Gas Operator | Nov 1998 |
| 2 | H.L.S. Energy Co., Inc. | Uvalde, TX 78801 | Oil & Gas Operator | Aug 2003 |
| 3 | H2ox Operating LLC | | Oil Operator | Feb 2024 |
| 4 | Hall And Kelley Oil & Gas | | Oil Operator | Dec 1995 |
| 5 | Hall Exploration, Inc. | Fort Worth, TX 76102 | Oil & Gas Operator | Jan 2024 |
| 6 | Hall Resources Corporation | Independence, MO 64057-2158 | Oil & Gas Operator | Jun 2016 |
| 7 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 8 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Dec 2023 |
| 9 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 10 | Hardwick Oil Company | Sugar Land, TX 77478 | Oil & Gas Operator | Nov 2014 |
| 11 | Harrell Petroleum Inc | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Oct 2017 |
| 12 | Harrell Verlan W | Oklahoma City, OK 73102-7201 | Oil & Gas Operator | Nov 1999 |
| 13 | Harris Oil & Gas Company | Denver, CO 80202 | Oil & Gas Operator | Jun 2016 |
| 14 | Harrison Oil & Gas Inc | Houston, TX 77019 | Oil & Gas Operator | Jan 2024 |
| 15 | Harrod Leasing | Arcadia, OK 73007-0043 | Oil & Gas Operator | Jan 2024 |
| 16 | Hawkins & Hawkins | Council Hill, OK 74428 | Oil & Gas Operator | Jul 1996 |
| 17 | Hawkins & Son Inc | Boynton, OK 74422-0125 | Oil & Gas Operator | Aug 2019 |
| 18 | Haynes Jim L & Betty L | Haskell, OK 74436-8803 | Oil & Gas Operator | Dec 2013 |
| 19 | HCG Energy Corporation & Subs | | Oil & Gas Operator | Mar 2015 |
| 20 | Headington Oil Company | Dallas, TX 75231 | Oil & Gas Operator | Dec 2016 |
| 21 | Heartland Exploration Inc | Edmond, OK 73013 | Oil & Gas Operator | Dec 2015 |
| 22 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 23 | Hendrickson W R | Beggs, OK 74421-2936 | Oil & Gas Operator | Jun 2023 |
| 24 | Henry Oil & Gas Inc | Oklahoma City, OK 73127 | Oil & Gas Operator | Jul 2009 |
| 25 | Henson Doyle | Okmulgee, OK 74447-4841 | Oil & Gas Operator | Jun 2020 |
| 26 | Henson Terry Dba Daycon Exploration | Tulsa, OK 74137-3546 | Oil & Gas Operator | Jan 2024 |
| 27 | Heritage Petroleum, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Apr 2024 |
| 28 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 29 | Highmark Energy Operating, LLC | Poynor, TX 75782 | Oil & Gas Operator | Apr 2024 |
| 30 | Hill Oil Company Inc | | Oil & Gas Operator | Jan 2024 |
| 31 | Hilligoss Leonard | | Oil Operator | Aug 2022 |
| 32 | Himco Oil & Gas, Inc. | Enid, OK 73702 | Oil & Gas Operator | Jan 2024 |
| 33 | Holke Dave Consulting Inc | Meridian, ID 83646-4812 | Oil & Gas Operator | Jan 2024 |
| 34 | Holman Ray | Okemah, OK 74859-0029 | Gas Operator | Jan 2024 |
| 35 | Homer Oil Co LLC | Holdenville, OK 74848-0787 | Oil Operator | Feb 2024 |
| 36 | Hosco Operating Inc | Seminole, OK 74868-2447 | Oil & Gas Operator | Aug 2017 |
| 37 | Howard Energy Co Inc | Traverse City, MI 49684 | Oil & Gas Operator | Jun 2014 |
| 38 | Howden Petroleum Corp | Wetumka, OK 74883 | Gas Operator | Nov 1997 |
| 39 | Howell Bill J | Calvin, OK 74531-0248 | Oil & Gas Operator | Sep 2016 |
| 40 | HRC Production Co | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 41 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Apr 2024 |
| 42 | Huber Energy Panhandle LP | Houston, TX 77079 | Oil & Gas Operator | Oct 2005 |
| 43 | Hughes Drilling Co. | Enid, OK 73702 | Oil & Gas Operator | Apr 1998 |
| 44 | Hughes Gas Systems LLC | Oklahoma City, OK 73118-4821 | Oil & Gas Operator | Jan 2024 |
| 45 | Hunton Oil & Gas Corporation | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | May 2019 |
| 46 | Hunton Operating LLC | Oklahoma City, OK 73154-0191 | Oil & Gas Operator | Feb 2024 |
| 47 | Husky Ventures Inc | Oklahoma City, OK 73172 | Oil & Gas Operator | Jan 2024 |
| 48 | Hutton Gas Operating Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2015 |
| 49 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |