| Company Name | Company Location | Company Type | Most Recent Production | |
|---|---|---|---|---|
| 1 | Gary-Williams Co (The) | Denver, CO 80202 | Oil Operator | Nov 2009 |
| 2 | Gould Oil Inc. | Wichita, KS 67278 | Oil & Gas Operator | Oct 2019 |
| 3 | Graham-Michaelis | Oil & Gas Operator | Nov 1996 | |
| 4 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 5 | Graves Drilling Co., Inc. | Wichita, KS 67208 | Oil & Gas Operator | Jun 2025 |
| 6 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jun 2025 |
| 7 | Griggs Oil Incor | Oil & Gas Operator | May 1994 |