| 1 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 2 | Gde Investments La, L.L.C. | | Oil & Gas Operator | Dec 2024 |
| 3 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 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 | George D. Hartfield Oil & Gas, Inc. | | Oil & Gas Operator | Dec 2024 |
| 8 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 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 | Goldking Onshore Operating, LLC | Houston, TX 77002 | Oil & Gas Operator | Jun 2016 |
| 13 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 14 | Goldsberry Operating Co., Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Aug 2020 |
| 15 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 16 | Gossco, Inc. | | Oil & Gas Operator | Feb 1989 |
| 17 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 18 | Graham-McCormick Oper. PRTSHP. | | Oil & Gas Operator | Aug 1989 |
| 19 | Great River Oil & Gas Corp. | | Oil & Gas Operator | Sep 1998 |
| 20 | Great Southern Oil &Gas Co Inc | | Oil & Gas Operator | Dec 2004 |
| 21 | Griffin Petroleum Company | Midland, TX 79705 | Oil & Gas Operator | Oct 2025 |
| 22 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 23 | Gruy Management Service Co. | | Oil & Gas Operator | Apr 1982 |
| 24 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 25 | Guardian Oil Company | | Oil & Gas Operator | Aug 1985 |
| 26 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 27 | Gulf Tech Energy LLC | | Oil & Gas Operator | Dec 2002 |
| 28 | Gyb-Britlind Oil, LLC | | Oil & Gas Operator | Jun 2016 |