| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | G M Oil | McPherson, KS 67460 | Oil Operator | Aug 1997 |
| 2 | Giant Holding, LLC | Tucson, AZ 85713 | Oil & Gas Operator | Mar 2025 |
| 3 | Glacier Petroleum Co., Inc. | Emporia, KS 66801 | Oil & Gas Operator | Jun 2025 |
| 4 | Gould Oil Incorp | Oil & Gas Operator | May 1996 | |
| 5 | GPS Oil Lease Operations | Inman, KS 67546 | Oil Operator | Jun 2001 |
| 6 | Graham-Michaelis | Oil & Gas Operator | Nov 1996 | |
| 7 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 8 | Grassland Petrol | Oil Operator | Feb 1993 |