| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | G & H Production Company LLC | Denver, CO 80202 | Oil Operator | Jan 2008 |
| 2 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Oct 2025 |
| 3 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 4 | Gibson J W | Oil & Gas Operator | Sep 1999 | |
| 5 | GKM Inc | Oil & Gas Operator | Mar 1990 | |
| 6 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 7 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 8 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |