| 1 | G3 Operating, LLC | | Oil & Gas Operator | May 2013 |
| 2 | Gadeco, LLC | | Oil & Gas Operator | Feb 2026 |
| 3 | Galaxy Oil | | Oil & Gas Operator | Feb 2026 |
| 4 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 5 | Gas Producing Enterprises, Inc. | | Oil & Gas Operator | Oct 1985 |
| 6 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Apr 2026 |
| 7 | Geolinear Co. | | Oil & Gas Operator | Jul 1996 |
| 8 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2024 |
| 9 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 10 | GMX Resources, Inc. | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2014 |
| 11 | Golden Eye Resources LLC | Greenwood VLG, CO 80121 | Oil Operator | Mar 2014 |
| 12 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 13 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Feb 2026 |
| 14 | Grayson Mill Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 15 | Great American Exploration, Inc. | | Oil Operator | Feb 1979 |
| 16 | Great American Royalties, Inc. | | Oil Operator | Mar 2026 |
| 17 | Great Western Drilling Company | Midland, TX 79701 | Oil & Gas Operator | Apr 2026 |
| 18 | Griffon & Associates, L.L.C. | Pearland, TX 77581 | Oil & Gas Operator | Jul 2008 |
| 19 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 20 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |