| 1 | Gap Energy, Inc. | | Oil & Gas Operator | Oct 1995 |
| 2 | Gas Transportation Corporation | | Oil & Gas Operator | Aug 1995 |
| 3 | Gcer Onshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 4 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 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 | Getty Reserve Oil, Inc. | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 8 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | May 2016 |
| 9 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 10 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 11 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 12 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 13 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 14 | Grand Energy, Inc. | Dallas, TX 75248 | Oil & Gas Operator | Oct 2002 |
| 15 | Grand Operating, Inc. | Addison, TX 75001 | Oil & Gas Operator | Dec 2020 |
| 16 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 17 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 18 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2024 |
| 19 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 20 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Feb 2024 |
| 21 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |