| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H. T. Hilliard & Co. | Oil & Gas Operator | Dec 1999 | |
| 2 | Hamilton Brothers Oil Co. | Houston, TX 77057 | Oil & Gas Operator | Mar 2015 |
| 3 | Harvest Petroleum Inc. | Frisco, TX 75033 | Oil & Gas Operator | Oct 2025 |
| 4 | Hexadyne Energy Corp. | Oil & Gas Operator | Dec 2013 |