| 1 | Gemini Exploration Company | Dallas, TX 75219 | Oil & Gas Operator | Mar 1997 |
| 2 | Genesis Well Service | Colleyville, TX 76034 | Oil Operator | Dec 2024 |
| 3 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 4 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 5 | Ginco Operating Co. | San Antonio, TX 78217 | Oil & Gas Operator | Dec 2024 |
| 6 | Ginger Petroleum Company, Inc. | La Grange, TX 78945 | Oil & Gas Operator | Dec 2024 |
| 7 | Glenco Oil & Gas Company | Seguin, TX 78155 | Oil & Gas Operator | Dec 1994 |
| 8 | Glenn, Wayne E. & Assoc., Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jun 2005 |
| 9 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 10 | Global Drilling, LLC | N Richlnd HLS, TX 76180 | Oil & Gas Operator | Dec 2024 |
| 11 | Go Oil Corp. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2024 |
| 12 | Go-Energy Co. | San Antonio, TX 78232 | Oil & Gas Operator | Mar 2002 |
| 13 | Golden Child, Inc. | San Antonio, TX 78213 | Oil & Gas Operator | Dec 2024 |
| 14 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 15 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 16 | Gouger Oil Co. | San Antonio, TX 78217 | Oil & Gas Operator | Nov 1995 |
| 17 | Gould Energy Co. | Owasso, OK 74055 | Oil & Gas Operator | Mar 2005 |
| 18 | Great West Energy & Expl., Inc. | Addison, TX 75001 | Oil & Gas Operator | Mar 2008 |
| 19 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 20 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 21 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 22 | Gulfmark Energy Inc | Houston, TX 77027 | Gas Operator | Apr 2023 |
| 23 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Dec 2024 |