| 1 | G & D Energy, Inc. | | Oil & Gas Operator | May 1986 |
| 2 | Gas Marketing, Inc. | Stafford, KS 67578 | Oil Operator | Mar 2007 |
| 3 | Gas Producing Enterprises Inc. | | Oil & Gas Operator | Oct 1985 |
| 4 | General Atlantic Energy Corp. | | Oil & Gas Operator | Nov 1988 |
| 5 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 6 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 7 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 8 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 9 | Gordy Oil Company | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 10 | Great Scott, Inc. | | Oil & Gas Operator | Oct 1993 |
| 11 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 12 | Greystone Operating, Inc. | | Oil & Gas Operator | Nov 2009 |
| 13 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 14 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 15 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 16 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Feb 2025 |
| 17 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |