| 1 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | Jun 2025 |
| 2 | G A W Oil Company LLC | Enid, OK 73702-3926 | Oil & Gas Operator | Jul 2025 |
| 3 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 4 | Gastar Exploration LLC | Tulsa, OK 74136-1921 | Oil & Gas Operator | Jun 2025 |
| 5 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 6 | General Producing Company | Houston, TX 77002 | Oil & Gas Operator | Jun 1993 |
| 7 | Genesis Inc | Seminole, OK 74818-1647 | Oil & Gas Operator | Sep 2014 |
| 8 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Jun 2025 |
| 9 | Geno Oil & Gas Corp | | Oil & Gas Operator | Sep 2009 |
| 10 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 11 | Geodyne Resources Inc. | Tulsa, OK 74103 | Oil & Gas Operator | Jul 2010 |
| 12 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 13 | GHK Company LLC (The) | Oklahoma City, OK 73118-1120 | Oil & Gas Operator | Apr 2018 |
| 14 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 15 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | Jul 2025 |
| 16 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | Jul 2025 |
| 17 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Jun 2025 |
| 18 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Jul 2025 |
| 19 | Goff D C Revocable Energy Trust | Fayetteville, AR 72702-1465 | Oil & Gas Operator | Jun 2005 |
| 20 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 21 | Gomaco Operating Company | Tulsa, OK 74115 | Oil & Gas Operator | Jul 2025 |
| 22 | Gordon Brothers Oil Company | Stroud, OK 74079 | Oil & Gas Operator | Jul 2017 |
| 23 | Gordon Robert Oil Company | Stroud, OK 74070-0366 | Oil & Gas Operator | Jul 2001 |
| 24 | Grand Lake Resources | Hennessey, OK 73742 | Oil & Gas Operator | Jul 2025 |
| 25 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 26 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 27 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Jul 2025 |
| 28 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 29 | Grooms T D | Stillwater, OK 74075-3600 | Oil & Gas Operator | Oct 2001 |
| 30 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 31 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 32 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2025 |
| 33 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 34 | GW Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1993 |
| 35 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | Jul 2025 |