| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H And H Star Energy Inc Dba Petrostar Energy | Oil & Gas Operator | Feb 2004 | |
| 2 | H R F Antrim LP | Gas Operator | Aug 2025 | |
| 3 | Hawkins Oil Of Michigan Inc | Oil & Gas Operator | Aug 2003 | |
| 4 | Highmount Midwest Energy LLC | Oil & Gas Operator | Sep 2011 | |
| 5 | Hound Resources LLC | Oil & Gas Operator | Jul 2025 | |
| 6 | Howard Energy Co Inc | Oil & Gas Operator | Aug 2011 | |
| 7 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Oct 2025 |
| 8 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |