| 1 | Gadeco, LLC | | Oil & Gas Operator | Oct 2025 |
| 2 | Genesis Gas & Oil Colorado LLC | | Oil & Gas Operator | Dec 2023 |
| 3 | Geomet Operating Co., Inc. | | Gas Operator | Dec 2013 |
| 4 | Geotech Production Inc | Centennial, CO 80016 | Oil Operator | Apr 2011 |
| 5 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 6 | Gilbert-Stewart Operating LLC | Denver, CO 80202 | Oil & Gas Operator | Sep 2025 |
| 7 | Gils Hot Oil Service | | Oil Operator | Jun 2022 |
| 8 | GMT Exploration Company LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 9 | Goodwin Energy Management LLC | | Oil & Gas Operator | Dec 2022 |
| 10 | Gordon Engineering Inc | | Gas Operator | Sep 2025 |
| 11 | Grand Mesa Operating Company | Wichita, KS 67206 | Oil & Gas Operator | Sep 2025 |
| 12 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jun 2016 |
| 13 | Great Western Operating Company LLC | | Oil & Gas Operator | Aug 2020 |
| 14 | Griffin Management LLC | | Oil & Gas Operator | Feb 2010 |
| 15 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Aug 2025 |
| 16 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Sep 2025 |
| 17 | Grynberg* Jack Dba Grynberg Petroleum Co | | Oil Operator | Jan 2023 |
| 18 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Aug 2025 |
| 19 | Gunnison Energy LLC | | Oil & Gas Operator | Sep 2025 |