| 1 | G/S Producing, Inc. | Chester, MT 59522 | Oil & Gas Operator | Mar 2026 |
| 2 | Gallup City Oil, Inc. | Conrad, MT 59425 | Oil & Gas Operator | Mar 2011 |
| 3 | Gallup City Oil, LLC | Conrad, MT 59425 | Oil Operator | Mar 2026 |
| 4 | Garman Stripper Wells, LLC | Choteau, MT 59422 | Oil Operator | Mar 2026 |
| 5 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Jun 2026 |
| 6 | Georesources, Inc. | Williston, ND 58802-1505 | Oil & Gas Operator | Dec 2024 |
| 7 | Germany Oil Company | Tulsa, OK 74135 | Oil & Gas Operator | Oct 2002 |
| 8 | Glacier Production, Inc. | Cut Bank, MT 59427 | Oil Operator | Mar 2026 |
| 9 | Grand Resources, LTD. | Rockville, MD 20852 | Oil Operator | Mar 2026 |
| 10 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Apr 2026 |
| 11 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 12 | Great Plains Energy, Inc. | Lincoln, NE 68516 | Oil & Gas Operator | Feb 2026 |
| 13 | Great Plains Operating, LLC. | Grapevine, TX 76051 | Oil & Gas Operator | Aug 2014 |
| 14 | Great Plains Resources, Inc. | Nixon, TX 78140 | Oil & Gas Operator | Jun 2026 |
| 15 | Green Valley Operating, LLC | Billings, MT 59108 | Oil & Gas Operator | Mar 2026 |
| 16 | Grey Wolf Production Company, Inc. | Garnett, KS 66032-0426 | Oil Operator | Mar 2015 |
| 17 | Griffon & Associates, L.L.C. | Pearland, TX 77581 | Oil & Gas Operator | Jul 2008 |
| 18 | Griffon Petroleum, Inc. | Calgary, AB T2P 3K2 | Oil & Gas Operator | May 2007 |
| 19 | Grizzly Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Feb 2026 |
| 20 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 21 | Gypsy Highview Gathering System, Inc. | Cut Bank, MT 59427-0250 | Oil & Gas Operator | Oct 2000 |