| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Hammer Oil Compa | Oil Operator | Oct 1985 | |
| 2 | Hartman Oil Co., Inc. | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 3 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Jun 2025 |
| 4 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Jun 2025 |
| 5 | Hogoboom Al Oilf | Oil Operator | Oct 1990 |