| 1 | G & H Production Company LLC | Denver, CO 80202 | Oil Operator | Jan 2008 |
| 2 | G & H Resources LLC | Denver, CO 80202 | Oil & Gas Operator | Dec 2009 |
| 3 | Galaxy Oil Company | Wichita Falls, TX 76307 | Oil & Gas Operator | Mar 2015 |
| 4 | Gallagher Drilling Inc | Evansville, IN 47730 | Oil Operator | Dec 2020 |
| 5 | Gallagher T P | Boulder, CO 80303 | Oil Operator | Apr 2019 |
| 6 | Gary-Williams Production Company | Denver, CO 80202 | Oil & Gas Operator | May 2000 |
| 7 | Gas Ventures LLC | Thermopolis, WY 82443 | Oil & Gas Operator | Oct 2020 |
| 8 | Gasamat Oil Corp Of Colorado | Boulder, CO 80303 | Oil Operator | Aug 2025 |
| 9 | Gasco Inc | | Oil & Gas Operator | Jun 1998 |
| 10 | Gasco Production Company | Denver, CO 80237 | Oil & Gas Operator | Dec 2015 |
| 11 | General American Oil Co Of Texas | | Oil & Gas Operator | Mar 1983 |
| 12 | General Atlantic Resources Inc | Denver, CO 80202 | Oil & Gas Operator | Jan 2022 |
| 13 | General Crude Oil Co | Houston, TX 77005 | Oil & Gas Operator | Dec 1979 |
| 14 | General Oil Company, Inc. | Wichita, KS 67213 | Oil & Gas Operator | Oct 2025 |
| 15 | Genesis Production Company | | Oil & Gas Operator | May 1991 |
| 16 | Genesis St Operating LLC | Kansas City, MO 64108 | Oil & Gas Operator | Oct 2025 |
| 17 | Geodyne Operating Company | Tulsa, OK 74103 | Oil & Gas Operator | Jun 2015 |
| 18 | Germany Operating Company | Houston, TX 77090 | Oil & Gas Operator | Sep 2011 |
| 19 | Getty Oil Company | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 20 | Gibbs William | | Oil Operator | Feb 2000 |
| 21 | Gibson J W | | Oil & Gas Operator | Sep 1999 |
| 22 | Gilmore Oil & Gas | Houston, TX 77002 | Oil & Gas Operator | Oct 2025 |
| 23 | Girouard Richard L | | Oil Operator | May 1985 |
| 24 | GKM Inc | | Oil & Gas Operator | Mar 1990 |
| 25 | Glenmar Company | Monterey, CO 93940 | Oil Operator | Oct 1998 |
| 26 | GLG Energy LP | Austin, TX 78701 | Oil & Gas Operator | Jun 1994 |
| 27 | GMT Energy Corporation | Houston, TX 77042 | Oil & Gas Operator | Feb 2005 |
| 28 | GMT Exploration Company LLC | Denver, CO 80202 | Oil & Gas Operator | Aug 2025 |
| 29 | Golden Energy Partners LLC | Denver, CO 80202 | Oil & Gas Operator | Jan 2010 |
| 30 | Golden Eye Resources LLC | Greenwood VLG, CO 80121 | Oil Operator | Mar 2014 |
| 31 | Goldmark Engineering Inc | Casper, WY 82602 | Oil & Gas Operator | Oct 2004 |
| 32 | Goodstein Fred | Casper, WY 82602 | Oil & Gas Operator | Mar 1984 |
| 33 | Gorman Construction LLC | Gillette, WY 82716 | Oil Operator | Jul 2025 |
| 34 | Gould Joseph B | Las Vegas, NV 89101 | Oil & Gas Operator | Apr 2001 |
| 35 | Gpo Operations LLC | Labarge, WY 83123 | Oil & Gas Operator | Aug 2025 |
| 36 | Grace Petroleum Corp. | Tulsa, OK 74103 | Oil & Gas Operator | Oct 1997 |
| 37 | Graham Royalty LTD | Covington, LA 70434 | Oil & Gas Operator | Jul 2007 |
| 38 | Granite Creek Energy LLC | Cody, WY 82414 | Oil & Gas Operator | Aug 2025 |
| 39 | Grayhorse Operating Inc | Tulsa, OK 74103-4439 | Oil & Gas Operator | Jun 2025 |
| 40 | Grayling Resources LTD | Lakewood, CO 80235 | Oil & Gas Operator | Jul 2020 |
| 41 | Grayson Mill Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Aug 2025 |
| 42 | GRB Resources | Tulsa, OK 74103 | Oil & Gas Operator | Mar 2004 |
| 43 | Great Northern Drilling Company | Billings, MT 59103 | Oil & Gas Operator | Jun 2016 |
| 44 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 45 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 46 | Great Western Oil Company | | Oil & Gas Operator | Dec 1984 |
| 47 | Great Western Resources Inc | | Oil & Gas Operator | Dec 1989 |
| 48 | Green Reserve Energy Holdings LLC | Houston, TX 77077 | Oil & Gas Operator | Aug 2025 |
| 49 | Greenstreet Lloyd | | Oil Operator | Dec 1986 |
| 50 | Greenwood Resources | | Oil & Gas Operator | Jan 1992 |
| 51 | Greka Am Inc | Santa Maria, CA 93454 | Oil & Gas Operator | May 2013 |
| 52 | Grey Hawk Operating LLC | Birmingham, AL 35242 | Oil Operator | Jan 2024 |
| 53 | Greylock Production LLC | Charleston, WV 25311-1264 | Oil & Gas Operator | Jul 2025 |
| 54 | Griffiths Oil LLC | Edgerton, WY 82635 | Oil Operator | Aug 2025 |
| 55 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 56 | GRMR Oil And Gas LLC | Broomfield, CO 80021 | Oil & Gas Operator | Sep 2025 |
| 57 | Gross Todd | Pine Bluffs, WY 82082 | Oil & Gas Operator | Mar 2007 |
| 58 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 59 | Grynberg, Jack J. | Denver, CO 80237 | Oil & Gas Operator | Jun 2021 |
| 60 | Guenthart William & Lavonne | Newcastle, WY 82701 | Oil Operator | Apr 2025 |
| 61 | Gulf Energy Corporation | Denver, CO 80237 | Oil & Gas Operator | Jun 1987 |
| 62 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2025 |
| 63 | Gulf Oil Corp. | Denver, CO 80201-0599 | Oil & Gas Operator | Dec 2014 |
| 64 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |