| 1 | G M Oil Properties Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Feb 2012 |
| 2 | G-Green F4P LLC | Howe, OK 74940 | Gas Operator | Apr 2026 |
| 3 | Galaxy Energy Inc. | Stigler, OK 74462 | Gas Operator | Dec 2025 |
| 4 | General Atlantic Resources, Inc. | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 5 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 6 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 7 | GHK Company LLC (The) | Oklahoma City, OK 73118-1120 | Oil & Gas Operator | Apr 2018 |
| 8 | Gla Inc | Norman, OK 73070 | Oil & Gas Operator | Apr 2026 |
| 9 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2026 |
| 10 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2026 |
| 11 | Glenwood Operating LLC | Wichita Falls, TX 76309-4529 | Gas Operator | Apr 2026 |
| 12 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Mar 2026 |
| 13 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 14 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 15 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 16 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Jul 2026 |
| 17 | Great Yellowstone Corporation | | Oil & Gas Operator | Apr 1993 |
| 18 | Greg Hall Oil & Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Apr 2026 |
| 19 | Gulfstream Petroleum Corp | | Oil & Gas Operator | Feb 2002 |