| Walker, M. P. G-3-148090 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 401K | 3.45M | Dec 1993 – Jul 2026 |
| Walker, M. P. G-3-149172 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 387K | 2.82M | Mar 1994 – Jul 2026 |
| Jr. Allen OL G-3-149216 | Chesapeake Operating, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 263K | 1.61M | Feb 1994 – Feb 2001 |
| Terry-Terry Unit G-3-143967 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 263K | 1.76M | by Jan 1993 – Feb 2008 |
| Waltman G-3-154083 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 239K | 2.34M | Mar 1995 – Feb 2017 |
| Thompson-Marsh Unit G-3-146625 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 232K | 2.22M | Aug 1993 – Aug 2020 |
| Dugger-Smith Unit G-3-149897 | Anadarko E&P Company LP only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 224K | 2.38M | May 1994 – Nov 2002 |
| Terry, H. L. Unit G-3-146621 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 215K | 2.05M | Jul 1993 – Aug 1999 |
| McCullough-Olden Unit G-3-146491 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 189K | 1.72M | May 1993 – Nov 2024 |
| Allen G-3-145818 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 188K | 1.3M | May 1993 – Aug 1999 |
| McCullough-McCullough 'A' G-3-145083 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 187K | 1.49M | by Jan 1993 – Feb 2000 |
| McCullough-McCullough Unit G-3-143450 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 181K | 1.53M | by Jan 1993 – Apr 2010 |
| Barrera G-3-146859 | Rosewood Resources, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 179K | 1.53M | Aug 1993 – Feb 2001 |
| Brazos Coal Ltd.- Nantucket Unit G-3-146622 | Anadarko E&P Company LP only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 175K | 1.77M | Aug 1993 – Jan 2006 |
| Lometa G-3-146240 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 150K | 1.74M | Jun 1993 – Dec 2015 |
| Brazos Coal Ltd.-Terry "B" Unit G-3-146180 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 134K | 915K | Jun 1993 – Aug 1999 |
| Lake-Smith Unit G-3-147607 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 132K | 1.42M | Nov 1993 – Nov 2012 |
| Anderson G-3-294876 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 128K | 4.08M | Nov 2022 – Jul 2026 |
| Shaughnessy-McFarlane Unit G-3-143336 | Crawford Hughes Operating Co. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 124K | 3.3M | by Jan 1993 – Nov 2020 |
| Abshire Unit G-3-151529 | Anadarko E&P Company LP only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 123K | 4.94M | Sep 1994 – Nov 2006 |
| Olden-Paull Unit G-3-145451 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 112K | 1.72M | Mar 1993 – Sep 2008 |
| Marrs-Quinn Unit G-3-151151 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 111K | 6.04M | Aug 1994 – Feb 2009 |
| Williams G-3-143403 | Rme Petroleum Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 100K | 2.51M | by Jan 1993 – Mar 2002 |
| Arhopulos-Brazos Unit G-3-144778 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 84.9K | 2.42M | Mar 1993 – Jul 2013 |
| Rust Unit G-3-293906 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 67.9K | 646K | Mar 2022 – Jul 2026 |
| Molitor Unit G-3-295820 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 61.2K | 397K | Nov 2022 – Jul 2026 |
| Moore Estate Unit G-3-157261 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 60.7K | 2.78M | Oct 1995 – Aug 2026 |
| Bell Unit G-3-294554 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 57.2K | 501K | May 2022 – Jul 2026 |
| Moore, H. H. Estate Unit G-3-144416 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 56.7K | 1.22M | Feb 1993 – Nov 2004 |
| Vilas-Moore G-3-148290 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 56.6K | 3.17M | Jan 1994 – Aug 2026 |
| Cannon-Chance Unit G-3-146964 | Rme Petroleum Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 55.8K | 625K | Jun 1993 – Jan 2001 |
| Dunlap-Keyser Unit G-3-148011 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 54K | 1.77M | Nov 1993 – May 1998 |
| Tison-Geudry Unit G-3-146847 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 53.7K | 899K | Sep 1993 – Oct 2007 |
| Wright, Anna Unit G-3-154520 | Ogden Resources Corporation only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 51.2K | 1.4M | Apr 1995 – Dec 2013 |
| McFarlane Unit 4 G-3-167648 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 49.1K | 1.08M | Nov 1997 – Jul 2010 |
| Sebesta-Vinson Unit G-3-143211 | McDaniel Company, Inc., The only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 48.5K | 1.05M | by Jan 1993 – Nov 1999 |
| Bell Unit G-3-293850 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 48K | 414K | May 2022 – Jul 2026 |
| Uvacek G-3-189840 | Shidler, Mark L., Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 47.2K | 987K | May 2002 – May 2012 |
| Arhopulos, T. J. G-3-146617 | Williams, Clayton Energy, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 45.8K | 1.07M | Jul 1993 – Jul 2013 |
| Bell Unit G-3-294255 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 45.7K | 373K | May 2022 – Jul 2026 |
| McFarlane, J. W. G-3-141646 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 37.7K | 920K | by Jan 1993 – Nov 2003 |
| Wade-Havens Unit G-3-145128 | Southwest Resources, Inc. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 32.7K | 753K | Feb 1993 – Nov 1997 |
| Mahaffey G-3-148164 | Snyder Oil Corporation only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 29.4K | 208K | Jan 1994 – Dec 1994 |
| Rust Unit G-3-294630 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 25.7K | 206K | Mar 2022 – Jul 2026 |
| Rust Unit G-3-294000 | Wildfire Energy Operating LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 22.8K | 407K | Mar 2022 – Jul 2026 |
| Millican-Havens Unit G-3-147034 | McDaniel Company, Inc., The only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 21.9K | 621K | Aug 1993 – Feb 2000 |
| Vilas G-3-155274 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 19.5K | 314K | May 1994 – Nov 2024 |
| Waltman-Chance Farms Unit G-3-144378 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 17.3K | 89K | by Jan 1993 – Feb 1997 |
| Day Unit G-3-156385 | Ogden Resources Corporation only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 17K | 447K | Jun 1995 – Oct 2011 |
| Vilas-Walton G-3-160200 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 16.8K | 2.39M | Apr 1996 – Mar 2026 |