| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hadco LTD | Ardmore, OK 73401-6929 | Oil & Gas Operator | Mar 2015 |
| 2 | Henderson Fred J | Okmulgee, OK 74447 | Oil & Gas Operator | Jun 2025 |
| 3 | His Energy Corporation Inc | Newcastle, OK 73065-1461 | Oil Operator | Feb 2018 |
| 4 | HMD Oil Co Inc | Ardmore, OK 73401-2542 | Oil & Gas Operator | Jul 2025 |
| 5 | Holden Energy Corporation | Ardmore, OK 73401 | Oil & Gas Operator | Mar 2015 |
| 6 | Hooker Phil Oil Operator | Oil Operator | Aug 1996 | |
| 7 | Horizon Natural Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2019 |