| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | H2ox Operating LLC | Oil Operator | Jan 2024 | |
| 2 | Hadson Petro USA Inc | Oil & Gas Operator | Nov 2016 | |
| 3 | Hadson Petroleum Corporation | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2015 |
| 4 | Ham Oil Company, LLC | Oil Operator | Sep 2022 | |
| 5 | Harris B D | Norman, OK 73071-4802 | Oil & Gas Operator | Apr 2014 |
| 6 | Heartlands Development Co Inc | Bristow, OK 74010-3826 | Oil & Gas Operator | May 2017 |
| 7 | Helmerich & Payne, Inc. | Tulsa, OK 74114 | Oil & Gas Operator | Dec 2023 |
| 8 | High Sierra Crude Oil& Marketing LLC | Ardmore, OK 73401 | Oil Operator | Nov 2013 |
| 9 | Hy-Carb Energy Inc | Oil & Gas Operator | Feb 2009 |