| 1 | Gene McCutchin | | Gas Operator | Aug 1999 |
| 2 | General American Oil Co Of TX | | Oil & Gas Operator | Jun 1983 |
| 3 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 4 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 5 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 6 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 7 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 8 | Getty Reserve Oil, Inc. | White Plains, NY 10650 | Oil & Gas Operator | Mar 2005 |
| 9 | Glassell Producing Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 10 | Goldking Operating Company, Inc. | Houston, TX 77002 | Oil & Gas Operator | Jun 2007 |
| 11 | Goldking Prod. Co. | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 12 | Good Shepard Resources, L.L.C. | | Gas Operator | Dec 2024 |
| 13 | Goodrich Oil Company | Shreveport, LA 71101 | Oil & Gas Operator | Nov 2001 |
| 14 | Goodrich Petroleum Company | Houston, TX 77002 | Oil & Gas Operator | Feb 2022 |
| 15 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 16 | Graham Oil And Gas, LTD. | Covington, LA 70434-3134 | Oil & Gas Operator | Aug 2013 |
| 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 | Greenhill Petroleum Corporation | Houston, TX 77077 | Oil & Gas Operator | Jan 1998 |
| 22 | Grigsby Petroleum Inc. | Shreveport, LA 71101 | Oil & Gas Operator | Oct 2025 |
| 23 | Gruy Petroleum Management Co. | Irving, TX 75014 | Oil & Gas Operator | Nov 2014 |
| 24 | Guaranty Energy Corporation | | Oil & Gas Operator | Aug 1990 |
| 25 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 26 | Gulf South Operators, Inc. | New Orleans, LA 70130 | Oil & Gas Operator | Oct 2015 |
| 27 | Gulf South Pipeline Company, LLC | | Oil & Gas Operator | Jan 2025 |
| 28 | Gulf South Pipeline Company, LP | Houston, TX 77001 | Oil & Gas Operator | Dec 2020 |
| 29 | Gulf States Production Company | Houston, TX 77027 | Oil & Gas Operator | Aug 1997 |
| 30 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Feb 2025 |