| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hershey Oil Corporation | Oil & Gas Operator | Jul 1992 | |
| 2 | High Plains Gas LLC | Gillette, WY 82717 | Gas Operator | Aug 2014 |
| 3 | Highland Exploration | Oil Operator | Sep 1979 | |
| 4 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | Oct 2025 |
| 5 | Home Petroleum Corp | Victoria, TX 77902 | Oil & Gas Operator | Oct 2025 |
| 6 | Hot Springs Resources LTD | Casper, WY 82601 | Oil Operator | Dec 2014 |
| 7 | Huber J M Corp | Edison, NJ 08837 | Oil & Gas Operator | Oct 2025 |
| 8 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |