| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Harmony Producing Co Inc | Oil & Gas Operator | Dec 1995 | |
| 2 | Harris & Payne-Randel Drilling | Oil & Gas Operator | Dec 1989 | |
| 3 | Hawkeye Drilling Co. | Waskom, TX 75692 | Oil & Gas Operator | Feb 2023 |
| 4 | High-Line Production Services LLC | Oil & Gas Operator | Aug 2024 | |
| 5 | Howell Petroleum Corporation | Houston, TX 77251 | Oil & Gas Operator | Oct 2015 |
| 6 | Humble Oil & Refining Co. | Houston, TX 77252 | Oil & Gas Operator | Jan 2000 |