| 1 | G & H Production Company LLC | Denver, CO 80202 | Oil Operator | Jan 2008 |
| 2 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 3 | Gallagher Drilling Inc | Evansville, IN 47730 | Oil Operator | Dec 2020 |
| 4 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 5 | General American Oil Co Of Texas | | Oil & Gas Operator | Mar 1983 |
| 6 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 7 | Genesis Production Company | | Oil & Gas Operator | May 1991 |
| 8 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 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 | Gibbs William | | Oil Operator | Feb 2000 |
| 12 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | Dec 2024 |
| 13 | GKM Inc | | Oil & Gas Operator | Mar 1990 |
| 14 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 15 | Goodstein Fred | Casper, WY 82602 | Oil & Gas Operator | Mar 1984 |
| 16 | Gorman Construction LLC | Gillette, WY 82716 | Oil Operator | Oct 2024 |
| 17 | Gould Joseph B | Las Vegas, NV 89101 | Oil & Gas Operator | Apr 2001 |
| 18 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 19 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 20 | Granite Creek Energy LLC | | Oil & Gas Operator | Oct 2024 |
| 21 | Grayling Resources LTD | Lakewood, CO 80235 | Oil & Gas Operator | Jul 2020 |
| 22 | Grayson Mill Operating, LLC | Houston, TX 77024 | Oil & Gas Operator | Oct 2024 |
| 23 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 24 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Dec 2024 |
| 25 | Greenwood Resources | | Oil & Gas Operator | Jan 1992 |
| 26 | Grey Hawk Operating LLC | Birmingham, AL 35242 | Oil Operator | Jan 2024 |
| 27 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Oct 2024 |
| 28 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Nov 2024 |
| 29 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 30 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |