| 1 | G M Oil Properties Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Feb 2012 |
| 2 | Galaxy Energy Inc | Stilger, OK 74462 | Gas Operator | Feb 2025 |
| 3 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 4 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 5 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 6 | GHK Company LLC (The) | Oklahoma City, OK 73118-1120 | Oil & Gas Operator | Apr 2018 |
| 7 | Gla Inc | Norman, OK 73070 | Oil & Gas Operator | Feb 2025 |
| 8 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Mar 2025 |
| 9 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Feb 2025 |
| 10 | Glenwood Operating LLC | Wichita Falls, TX 76309-4529 | Gas Operator | Feb 2025 |
| 11 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Jan 2025 |
| 12 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 13 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 14 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 15 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Jun 2025 |
| 16 | Great Yellowstone Corp. | | Oil & Gas Operator | Apr 1993 |
| 17 | Greg Hall Oil & Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Feb 2025 |
| 18 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |