| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H & C Oil Operat | Oil & Gas Operator | Dec 1996 | |
| 2 | H & M Packers Serv. L.L.C. | Oil Operator | Dec 2019 | |
| 3 | Hammerschmidt Wi | Oil Operator | Sep 1991 | |
| 4 | Harris Oil & Gas | Oil & Gas Operator | Jul 1995 | |
| 5 | Hartman Oil Company Inc | Wichita, KS 67206 | Oil & Gas Operator | Jun 2025 |
| 6 | Hasada Industrie | Oil & Gas Operator | Jul 1995 | |
| 7 | Hawkins Oil & Ga | Oil & Gas Operator | Jun 1995 | |
| 8 | Haynie Robert L | Gas Operator | Jan 2004 | |
| 9 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Jun 2025 |
| 10 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Jun 2025 |
| 11 | High Bluff Operating, LLC | Littleton, CO 80161 | Oil & Gas Operator | May 2018 |
| 12 | Hondo Oil & Gas | Houston, TX 77042 | Oil & Gas Operator | Oct 1995 |
| 13 | Huber J M Corpor | Oil & Gas Operator | Dec 1996 | |
| 14 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |