| 1 | G & C Petroleum Inc | Yale, OK 74085-2502 | Oil & Gas Operator | May 2025 |
| 2 | G & G Saltwater Disposal Systems Inc | Perry, OK 73077-0854 | Oil Operator | Mar 2005 |
| 3 | G E Operating, Inc. | Graham, TX 76450 | Oil & Gas Operator | May 2020 |
| 4 | G M C Oil & Gas LTD | Oklahoma City, OK 73102-8804 | Oil & Gas Operator | Sep 1999 |
| 5 | Ganer Mark Oil & Gas | Owasso, OK 74055 | Oil & Gas Operator | Aug 2005 |
| 6 | Ganer Oil Company | Blackwell, OK 74631-4221 | Oil & Gas Operator | Jan 2022 |
| 7 | Garry Davis Oil LLC | Tonkawa, OK 74653-0040 | Oil & Gas Operator | Apr 2025 |
| 8 | Gear Petroleum Company, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Dec 2009 |
| 9 | Gemini Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 10 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 11 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Jul 2025 |
| 12 | Genie Oil & Gas Corporation | Broken Arrow, OK 74013-3783 | Oil & Gas Operator | Mar 2025 |
| 13 | Geo American Resources Inc | Tulsa, OK 74103 | Oil & Gas Operator | Apr 2025 |
| 14 | Geo Engineering, Inc. | Houston, TX 77027 | Oil & Gas Operator | Jun 2009 |
| 15 | Geo-Earth Exploration Co Inc | Stillwater, OK 74076 | Oil & Gas Operator | May 1994 |
| 16 | Geyer Brothers Equipment Company | Noble, OK 73068-8540 | Oil & Gas Operator | Mar 2011 |
| 17 | Gilliland Oil And Gas Inc | Hennessey, OK 73742 | Oil & Gas Operator | May 2025 |
| 18 | Glacier Petroleum Co Okla Inc | Edmond, OK 73013-1977 | Oil & Gas Operator | May 2025 |
| 19 | GLB Exploration, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2025 |
| 20 | Glenn Supply Company, Inc. | Tulsa, OK 74101 | Oil & Gas Operator | Apr 2025 |
| 21 | GLM Energy Inc | Oklahoma City, OK 73142 | Oil & Gas Operator | Apr 2025 |
| 22 | Gomaco Inc | Tulsa, OK 74103-5061 | Oil & Gas Operator | Apr 2015 |
| 23 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 24 | Gray Lloyd Energy Inc | Oklahoma City, OK 73120-8112 | Oil & Gas Operator | Nov 2005 |
| 25 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Jul 2025 |
| 26 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | May 2025 |
| 27 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 28 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | May 2025 |
| 29 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 30 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |