| 1 | Gary L. Deaton Corporation | Oklahoma City, OK 73105-3023 | Oil & Gas Operator | Mar 2015 |
| 2 | Gas Development Corporation | Broken Arrow, OK 74012 | Oil & Gas Operator | Mar 2015 |
| 3 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 4 | General Minerals Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2015 |
| 5 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 6 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 7 | Geyer Brothers Equipment Company | Noble, OK 73068-8540 | Oil & Gas Operator | Mar 2011 |
| 8 | GHK Company LLC (The) | Oklahoma City, OK 73118-1120 | Oil & Gas Operator | Apr 2018 |
| 9 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Sep 2025 |
| 10 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Oct 2025 |