| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H3 Oil & Gas | Oil & Gas Operator | Sep 2025 | |
| 2 | Hart Energies, LLC | Tulsa, OK 74133 | Oil & Gas Operator | Dec 2016 |
| 3 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 4 | Hasada Industrie | Oil & Gas Operator | Jul 1995 | |
| 5 | Hawkins Oil & Ga | Oil & Gas Operator | Jun 1995 | |
| 6 | Hayes Oil & Gas LLC | Attica, KS 67009 | Oil & Gas Operator | Sep 2025 |
| 7 | Hayes Well Servi | Oil & Gas Operator | Feb 1992 | |
| 8 | Helbing & Robert | Oil & Gas Operator | Feb 1991 | |
| 9 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Sep 2025 |
| 10 | Howell Oil Compa | Oil & Gas Operator | Aug 1995 | |
| 11 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |