| 1 | G & W Production Company L.L.C. | El Campo, TX 77437 | Oil Operator | May 2017 |
| 2 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 3 | G.R.P. Gauging, Inc. | Wharton, TX 77488 | Oil & Gas Operator | Oct 2010 |
| 4 | Gaither Petroleum Corporation | Katy, TX 77493 | Oil & Gas Operator | Oct 2025 |
| 5 | Galloway Lone Star, L.L.C. | Tomball, TX 77377 | Oil & Gas Operator | Oct 2025 |
| 6 | Gardner Energy Corporation | Houston, TX 77024 | Oil & Gas Operator | Mar 1999 |
| 7 | Garrison LTD. | San Antonio, TX 78257 | Oil & Gas Operator | Oct 2025 |
| 8 | Gasper Rice Resources, LTD. | Houston, TX 77068 | Oil & Gas Operator | Oct 2025 |
| 9 | Gcer Onshore, LLC | Houston, TX 77002 | Oil & Gas Operator | Dec 2015 |
| 10 | Gec Operating, Inc. | Houston, TX 77024 | Oil & Gas Operator | Oct 2025 |
| 11 | Gemarmi Inc. | Cypress, TX 77433 | Oil & Gas Operator | Oct 2025 |
| 12 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Oct 2025 |
| 13 | Geodominion Petroleum | Corpus Chrsti, TX 78403 | Oil & Gas Operator | May 2012 |
| 14 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 15 | Geosouthern Energy Corporation | The Woodlands, TX 77380 | Oil & Gas Operator | Oct 2025 |
| 16 | Gillring Oil Company | Fort Worth, TX 76102 | Oil & Gas Operator | May 1994 |
| 17 | Glenn, Wayne E. & Assoc., Inc. | Dickinson, TX 77539 | Oil & Gas Operator | Jun 2005 |
| 18 | Goldenrod Gas, Inc. | Victoria, TX 77904 | Gas Operator | Oct 2025 |
| 19 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 20 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 21 | Goldston Oil Corporation | Houston, TX 77257 | Oil & Gas Operator | Oct 2025 |
| 22 | Goliad Operating Company | Houston, TX 77265 | Oil & Gas Operator | Aug 2003 |
| 23 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 24 | Grand Resources Inc | Tulsa, OK 74137 | Oil & Gas Operator | Oct 2025 |
| 25 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 26 | Great Western Onshore Inc | Houston, TX 77002 | Oil & Gas Operator | Mar 2008 |
| 27 | Green Exploration Company | Austin, TX 78711 | Oil & Gas Operator | Oct 2025 |
| 28 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 29 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 30 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 31 | Gulfstar Properties, Inc. | San Antonio, TX 78229 | Oil & Gas Operator | Oct 2025 |