| 1 | G & P Exploration, Inc. | | Oil Operator | Aug 1987 |
| 2 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Oct 2025 |
| 3 | Gap Energy, Inc. | | Oil & Gas Operator | Oct 1995 |
| 4 | Geb Operating, LLC | | Oil & Gas Operator | Jan 2025 |
| 5 | Ged Oil Corporation | | Oil & Gas Operator | Aug 2012 |
| 6 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 7 | General Atlantic Energy Corp. | | Oil & Gas Operator | Nov 1988 |
| 8 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Oct 2025 |
| 9 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 10 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 11 | Getty Reserve Oil, Inc. | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 12 | Glasscock Drilling, Inc. | | Oil & Gas Operator | Dec 1977 |
| 13 | Goldco Operating LLC | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 14 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 15 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 16 | Goldrus Producing Company | Houston, TX 77064 | Oil & Gas Operator | Aug 2009 |
| 17 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 18 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 19 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 20 | Goodrich Petroleum Corporation | | Oil & Gas Operator | Sep 1996 |
| 21 | Gordy Oil Company | Houston, TX 77007 | Oil & Gas Operator | Oct 2025 |
| 22 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 23 | Graham Exploration, LTD. | | Oil & Gas Operator | Oct 1993 |
| 24 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 25 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 26 | Great Scott, Inc. | | Oil & Gas Operator | Oct 1993 |
| 27 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 28 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 29 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 30 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |