| 1 | H And H Star Energy Inc Dba Petrostar Energy | | Oil & Gas Operator | Feb 2004 |
| 2 | H And K Resources Inc | | Oil Operator | Dec 2012 |
| 3 | H L Brown Operating LLC | Midland, TX 79702 | Oil & Gas Operator | Dec 2025 |
| 4 | H R F Antrim LP | | Gas Operator | May 2026 |
| 5 | Haischer James W Dba Haischer James W And Assoc | | Oil & Gas Operator | Dec 2001 |
| 6 | Halex Inc | | Oil & Gas Operator | Nov 1988 |
| 7 | Hardy And Hardy Consulting LLC | | Oil & Gas Operator | May 2026 |
| 8 | Hart Energy LLC | | Oil Operator | Feb 2026 |
| 9 | Hasso Energy LLC | | Oil & Gas Operator | Feb 2026 |
| 10 | Hawkins Oil Of Michigan Inc | | Oil & Gas Operator | Aug 2003 |
| 11 | Heat Controller Inc | Jackson, MI 49204 | Oil & Gas Operator | Dec 1996 |
| 12 | Henry Sappington Machine & Tool Dba Henry Sappingt | | Oil Operator | Oct 2017 |
| 13 | Highmount Midwest Energy LLC | | Oil & Gas Operator | Sep 2011 |
| 14 | Hilden Oil Co Inc | | Oil & Gas Operator | Oct 2024 |
| 15 | Hobson Petroleum Corp | | Oil & Gas Operator | Sep 1991 |
| 16 | Hope Oil Corporation | | Oil Operator | Jun 2026 |
| 17 | Hound Resources LLC | | Oil & Gas Operator | May 2026 |
| 18 | House Thomas J | | Oil Operator | Jun 2026 |
| 19 | Houseknecht Oil Producers Inc | | Oil & Gas Operator | Dec 1994 |
| 20 | Howard Energy Co Inc | | Oil & Gas Operator | Aug 2011 |
| 21 | Hoy Production LLC | | Gas Operator | Apr 2026 |
| 22 | HRF Exploration & Production LLC | Gaylord, MI 49734-0160 | Gas Operator | Aug 2026 |
| 23 | HRF Exploration & Production,Inc | Denver, CO 80237 | Oil & Gas Operator | Mar 2009 |
| 24 | Hunt Energy Corporation | | Oil & Gas Operator | Feb 2002 |
| 25 | Hyperion Energy LP | Dallas, TX 75206 | Oil & Gas Operator | May 2014 |