| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H2ox Operating LLC | Oil Operator | Feb 2024 | |
| 2 | Halfway Oil Inc | Tahlequah, OK 74464-5448 | Oil & Gas Operator | Aug 2013 |
| 3 | Ham Oil Company, LLC | Oil Operator | Sep 2022 | |
| 4 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 5 | Herzfeld Fabricators Inc | Wichita Falls, TX 76307 | Oil & Gas Operator | Aug 2017 |
| 6 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 7 | HRC Production Co | Houston, TX 77002 | Oil & Gas Operator | Jan 2024 |
| 8 | Hy-Carb Energy Inc | Oil & Gas Operator | Feb 2009 |