| 1 | G M Oil Properties Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Feb 2012 |
| 2 | Gadsco Inc | Ardmore, OK 73402 | Gas Operator | Jun 2013 |
| 3 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 4 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 5 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 6 | Gla Inc | Norman, OK 73070 | Oil & Gas Operator | Jun 2025 |
| 7 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 8 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2025 |
| 9 | Glenwood Operating LLC | Wichita Falls, TX 76309-4529 | Gas Operator | May 2025 |
| 10 | Gold-Mont Oil Company Inc | Tulsa, OK 74107 | Oil & Gas Operator | Nov 2015 |
| 11 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | May 2025 |
| 12 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 13 | Gosnell Tony Operating LLC | Lindsay, OK 73052 | Oil & Gas Operator | Jul 2025 |
| 14 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 15 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 16 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 17 | Great Basins Petroleum Co. | | Gas Operator | Mar 2015 |
| 18 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 19 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2025 |
| 20 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 21 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |