| 1 | Gadeco LLC | | Oil & Gas Operator | Sep 2024 |
| 2 | Genesis Gas & Oil Colorado LLC | | Oil & Gas Operator | Dec 2023 |
| 3 | Genesis Gas & Oil LLC | Kansas City, MO 64108 | Oil & Gas Operator | Aug 2011 |
| 4 | Geomet Operating Company Inc | | Gas Operator | Dec 2013 |
| 5 | Geotech Production Inc | Centennial, CO 80016 | Oil & Gas Operator | Jun 2020 |
| 6 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 7 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 8 | Gilbert-Stewart Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2024 |
| 9 | Gils Hot Oil Service | | Oil & Gas Operator | Jun 2022 |
| 10 | GMT Exploration Company LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2024 |
| 11 | Goodwin Energy Management LLC | | Oil & Gas Operator | Dec 2022 |
| 12 | Gordon Engineering Inc | | Gas Operator | Sep 2024 |
| 13 | Gosney & Sons Inc | | Gas Operator | Jun 2019 |
| 14 | Gould & Associates* Joseph B | | Gas Operator | Sep 2002 |
| 15 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2024 |
| 16 | Grand Valley Resources Inc | Seville, OH 44273 | Oil & Gas Operator | Jul 2024 |
| 17 | Grayhorse Operating Inc | Tulsa, OK 74103-4439 | Oil & Gas Operator | Sep 2024 |
| 18 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 19 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Nov 2024 |
| 20 | Great Western Operating Company LLC | | Oil & Gas Operator | Aug 2022 |
| 21 | Griffin Management LLC | | Oil & Gas Operator | Feb 2010 |
| 22 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2024 |
| 23 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Oct 2024 |
| 24 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil & Gas Operator | Jan 2023 |
| 25 | Gulfport Energy Corporation | Oklahoma City, OK 73134-5003 | Oil & Gas Operator | Apr 2024 |
| 26 | Gunnison Energy Corporation | | Oil & Gas Operator | Jun 2014 |
| 27 | Gunnison Energy LLC | | Oil & Gas Operator | Aug 2024 |