| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hadson Energy Resources Corp. | Houston, TX 77056 | Oil & Gas Operator | Dec 1994 |
| 2 | Hadson Petroleum (USA), Inc. | Oil & Gas Operator | Dec 1992 | |
| 3 | Harcor Exploration Inc. | Oil Operator | Aug 1989 | |
| 4 | Henderson Oil & Gas | Oil Operator | Sep 1990 | |
| 5 | HGH Energy, Inc. | Oil & Gas Operator | Jun 2001 | |
| 6 | Hilcorp Energy Company | Houston, TX 77208 | Oil & Gas Operator | May 2024 |
| 7 | HK Energy Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2023 |
| 8 | Hurley Petroleum Corporation | Baton Rouge, LA 70821 | Oil & Gas Operator | Feb 2000 |