| 1 | H2ox Operating LLC | | Oil Operator | Feb 2024 |
| 2 | Hale John H | Tulsa, OK 74107 | Oil & Gas Operator | Mar 2000 |
| 3 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 4 | Halgas Inc | Tulsa, OK 74101-3012 | Oil & Gas Operator | May 2013 |
| 5 | Halliburton Oil Producing Co. | Duncan, OK 73534 | Oil & Gas Operator | Apr 2016 |
| 6 | Ham Oil Company, LLC | | Oil Operator | Sep 2022 |
| 7 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 8 | Heath Jack A | Tulsa, OK 74132-2403 | Oil & Gas Operator | Jan 2013 |
| 9 | Helmco LTD | Kiefer, OK 74041-0397 | Oil & Gas Operator | Jan 2007 |
| 10 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 11 | Hillenburg Oil Company | Broken Arrow, OK 74011-4021 | Oil Operator | Apr 2011 |
| 12 | HMX Investments Inc | Katy, TX 77494 | Oil & Gas Operator | Jan 2024 |
| 13 | Holloway David A | Okmulgee, OK 74447-9191 | Oil & Gas Operator | Jan 2024 |
| 14 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | May 2024 |
| 15 | Home-Stake Royalty Corp., The | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2014 |
| 16 | Hondo Oil & Gas Company | Roswell, NM 88202 | Oil & Gas Operator | Aug 2006 |
| 17 | Hope Oil Inc | Midland, TX 79702 | Oil & Gas Operator | Oct 2021 |
| 18 | Hoppes Helen E | Depew, OK 74028-3428 | Oil & Gas Operator | Apr 2015 |
| 19 | Horizon Natural Gas Company | Tulsa, OK 74170 | Oil & Gas Operator | Jan 2024 |
| 20 | Hoyt John C | Bartlesville, OK 74005-1316 | Oil Operator | Feb 2000 |
| 21 | Hunt Brothers Producing Co Inc | Redding, CA 96049-2516 | Oil & Gas Operator | Sep 2012 |
| 22 | Huntington Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2006 |
| 23 | Hy-Carb Energy Inc | | Oil & Gas Operator | Feb 2009 |
| 24 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |