| 1 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 2 | G M Oil Properties Inc | Eufaula, OK 74432-0841 | Oil & Gas Operator | Feb 2012 |
| 3 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 4 | Garrison Bros Pipe & Used Equip Inc | Hinton, OK 73047 | Oil & Gas Operator | Aug 2013 |
| 5 | Gary L. Deaton Corporation | Oklahoma City, OK 73105-3023 | Oil & Gas Operator | Mar 2015 |
| 6 | Gas Enhancement Inc | Oklahoma City, OK 73120 | Oil & Gas Operator | Apr 2014 |
| 7 | Gene Cook Inc | Woodward, OK 73801 | Oil & Gas Operator | Sep 2025 |
| 8 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 9 | General Minerals Corp | Oklahoma City, OK 73105 | Oil & Gas Operator | Dec 2015 |
| 10 | Geo American Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Aug 2025 |
| 11 | Geo Exploration LLC | Oklahoma City, OK 73120-7116 | Oil & Gas Operator | Jun 2024 |
| 12 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 13 | Geodyne Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 14 | Giant Exploration & Prod Co | Farmington, NM 87499 | Oil & Gas Operator | Dec 2009 |
| 15 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Sep 2025 |
| 16 | GLB Exploration Inc | Oklahoma City, OK 73102 | Oil & Gas Operator | Sep 2025 |
| 17 | Golden Gas Energies Inc | | Oil & Gas Operator | Jan 1999 |
| 18 | Golden Gas Production Company | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2025 |
| 19 | Gothic Energy Corporation | Tulsa, OK 74136 | Oil & Gas Operator | Jul 2015 |
| 20 | Gothic Production Corporation | Oklahoma City, OK 73154 | Oil & Gas Operator | Dec 2016 |
| 21 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 22 | Graham-Michaelis Corporation | Wichita, KS 67201 | Oil & Gas Operator | Dec 2010 |
| 23 | GRB Properties, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2003 |
| 24 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Dec 2025 |
| 25 | Green River Exploration Co | Tulsa, OK 74121-1468 | Oil & Gas Operator | Sep 2011 |
| 26 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Sep 2025 |
| 27 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 28 | Greenwood Energy Inc | Oklahoma City, OK 73116-9083 | Oil & Gas Operator | Mar 2015 |
| 29 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Dec 2025 |
| 30 | Griggs Oil LLC | Dewey, OK 74029-0477 | Oil & Gas Operator | Aug 2025 |
| 31 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 32 | Gruenerwald WM & Assoc Inc | Colorado Spring, CO 80960-0669 | Oil & Gas Operator | Jan 2002 |
| 33 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 34 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |