| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H2ox Operating LLC | Oil Operator | Feb 2024 | |
| 2 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 3 | Ham Oil Company, LLC | Oil Operator | Sep 2022 | |
| 4 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 5 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 6 | His Energy Corporation Inc | Newcastle, OK 73065-1461 | Oil Operator | Feb 2018 |
| 7 | HMD Oil Co Inc | Oil & Gas Operator | Feb 2024 | |
| 8 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 9 | Hooker Phil Oil Operator | Oil Operator | Aug 1996 | |
| 10 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |
| 11 | Hy-Carb Energy Inc | Oil & Gas Operator | Feb 2009 |