| 1 | G. B. & F. Exploration, Inc. | | Oil & Gas Operator | Feb 1991 |
| 2 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Oct 2025 |
| 3 | Gas Gathering Corp. | | Oil Operator | Oct 1997 |
| 4 | Gas Marketing, Inc. | Stafford, KS 67578 | Oil Operator | Mar 2007 |
| 5 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 6 | George D. Hartfield Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 7 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 8 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 9 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 10 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 11 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 12 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 13 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 14 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 15 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 16 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 17 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 18 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 19 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |