| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hallador Petroleum LLP | Denver, CO 80264 | Oil & Gas Operator | Feb 2019 |
| 2 | Hanson Operating Company Inc | Roswell, NM 88202 | Oil & Gas Operator | Jul 2025 |
| 3 | Holden Harold B | Billings, MT 59103 | Oil Operator | Jun 1996 |
| 4 | Hughes Oil Company Inc | Odessa, TX 79765 | Oil & Gas Operator | Feb 2004 |
| 5 | Hunt Oil Company | Dallas, TX 75201 | Oil & Gas Operator | Oct 2025 |
| 6 | Husky Oil Company | Cody, WY 82414 | Oil & Gas Operator | Dec 1984 |
| 7 | Hyland Oil Corporation | Oil & Gas Operator | Apr 1990 |