| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Jun 2025 |
| 2 | H-D Oilfield Service, Inc. | Bazine, KS 67516 | Oil Operator | Jun 2025 |
| 3 | Hansen Dane G TR | Oil Operator | Feb 1995 | |
| 4 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 5 | Hembree Robert F | Oil Operator | Dec 2009 | |
| 6 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Jun 2025 |
| 7 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Jun 2025 |
| 8 | Hillary Oil Comp | Oil & Gas Operator | Apr 1991 | |
| 9 | Horner Richard R | Gas Operator | May 1995 | |
| 10 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 11 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |