| 1 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Oct 2025 |
| 2 | Gas Producing Enterprises Inc. | | Oil & Gas Operator | Oct 1985 |
| 3 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 4 | Genesis Producing Company, L.P. | Corpus Chrsti, TX 78471 | Oil & Gas Operator | Dec 2017 |
| 5 | George D. Hartfield Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 6 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 7 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 8 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 9 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 10 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 11 | Graham Expl LTD-DRLG PRNRSHP | | Oil & Gas Operator | Aug 1984 |
| 12 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 13 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 14 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 15 | Gruy Management Service Co. | | Oil & Gas Operator | Apr 1982 |
| 16 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 17 | Gulf Production Company, Inc. | | Oil & Gas Operator | Dec 2024 |
| 18 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 19 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 20 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |