| T. T. Co. Fee O-3-3929 | Radco Operations, L.P. only | Sour Lake | Hardin | 427 | 1.72M | 738 | Jan 1993 – Mar 2026 |
| Sun Pipe Line Co. Fee O-3-20040 | Foundation Energy Management LLC only | Sour Lake | Hardin | 6 | 700K | 531K | Jan 1993 – Apr 2026 |
| Tarver - Hardin O-3-3866 | Radco Operations, L.P. only | Sour Lake | Hardin | 28 | 672K | 21 | Jan 1993 – Apr 2026 |
| Wilkinson, et Al O-3-19968 | Foundation Energy Management LLC only | Sour Lake | Hardin | 1 | 471K | 74K | Jan 1993 – Apr 2026 |
| Carpenter Unit O-3-20271 | Foundation Energy Management LLC only | Sour Lake | Hardin | 5 | 423K | 127K | Jan 1993 – Apr 2026 |
| Chevron Fee O-3-20138 | Foundation Energy Management LLC only | Sour Lake | Hardin | 3 | 376K | 145K | Jan 1993 – Apr 2026 |
| Texaco Fee 4596 O-3-20335 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 256K | 143K | Jan 1993 – Mar 2026 |
| Arco et Al O-3-20044 | Foundation Energy Management LLC only | Sour Lake | Hardin | 3 | 221K | 230K | Jan 1993 – May 2011 |
| Humble - West O-3-3865 | Radco Operations, L.P. only | Sour Lake | Hardin | 18 | 217K | 21 | Jan 1993 – Apr 2026 |
| Amoco-Berryman O-3-20272 | Foundation Energy Management LLC only | Sour Lake | Hardin | 1 | 204K | 116K | Jan 1993 – Feb 2023 |
| Gauss et Al O-3-19982 | Foundation Energy Management LLC only | Sour Lake | Hardin | 3 | 200K | 103K | Jan 1993 – Apr 2019 |
| Mobil Fee Unit O-3-20067 | Foundation Energy Management LLC only | Sour Lake | Hardin | 2 | 153K | 51.4K | Jan 1993 – Apr 2026 |
| McCaig O-3-20419 | Foundation Energy Management LLC only | Sour Lake | Hardin | 1 | 153K | 322K | Jan 1993 – Aug 2013 |
| Terry O-3-23720 | Silverbrook Operating, LLC only | Sour Lake | Hardin | 2 | 137K | 0 | Sep 1999 – Apr 2026 |
| Carpenter Production Co. O-3-3915 | Radco Operations, L.P. only | Sour Lake | Hardin | 10 | 134K | 101K | Jan 1993 – Apr 2026 |
| Gilbert Oil Company O-3-3823 | Radco Operations, L.P. only | Sour Lake | Hardin | 17 | 120K | 22 | Jan 1993 – Apr 2026 |
| Texaco Fee 4598 O-3-20347 | Radco Operations, L.P. only | Sour Lake | Hardin | 3 | 106K | 92.8K | Jan 1993 – Sep 2011 |
| Amoco "B" O-3-20342 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 104K | 62.8K | Jan 1993 – Feb 2025 |
| Minor Oil Company O-3-3831 | Radco Operations, L.P. only | Sour Lake | Hardin | 8 | 95.3K | 22 | Jan 1993 – Apr 2026 |
| Hooks, Chas., G. Etal O-3-3874 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 92.9K | 51 | Jan 1993 – Apr 2026 |
| Hebert & Ebberts O-3-3825 | Radco Operations, L.P. only | Sour Lake | Hardin | 11 | 90.1K | 22 | Jan 1993 – Apr 2026 |
| Rosedale O-3-20502 | Foundation Energy Management LLC only | Sour Lake | Hardin | 3 | 82.8K | 178K | Jan 1993 – Sep 2005 |
| Flag-Redfern O-3-20237 | Foundation Energy Management LLC only | Sour Lake | Hardin | 3 | 77.9K | 70.4K | Jan 1993 – Jul 2003 |
| Minor Oil Co. -B- O-3-10591 | Radco Operations, L.P. only | Sour Lake | Hardin | 7 | 72.8K | 22 | Jan 1993 – Apr 2026 |
| Reed, T. S. Unit O-3-3891 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 72.6K | 51 | Jan 1993 – Apr 2026 |
| Sun Oil Co. -A- O-3-3884 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 68.7K | 51 | Jan 1993 – Apr 2026 |
| Yount O-3-20657 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 63.8K | 22 | Jan 1993 – Apr 2026 |
| Cooper O-3-18312 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 62.9K | 36 | Oct 1993 – Apr 2026 |
| Cohen Estate O-3-9120 | Radco Operations, L.P. only | Sour Lake | Hardin | 5 | 61.1K | 22 | Jan 1993 – Apr 2026 |
| Gulf Oil Corp., Etal O-3-3872 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 60.3K | 50 | Jan 1993 – Apr 2026 |
| Merchant O-3-11110 | Radco Operations, L.P. only | Sour Lake | Hardin | 5 | 58.2K | 22 | Jan 1993 – Apr 2026 |
| Jackson Estate O-3-3827 | Radco Operations, L.P. only | Sour Lake | Hardin | 6 | 58.1K | 0 | Apr 2011 – Apr 2026 |
| Sun Fee SWD O-3-3923 | Radco Operations, L.P. only | Sour Lake | Hardin | 3 | 56.5K | 29 | Jan 1993 – Sep 2017 |
| Gilbert O-3-3852 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 54.7K | 22 | Jan 1993 – Mar 2026 |
| Bass, W. L. Etal O-3-3870 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 54.6K | 52 | Jan 1993 – Apr 2026 |
| Terry, H. M. O-3-3924 | Rheaco Oil Company, Ltd. only | Sour Lake | Hardin | 15 | 52.9K | 18 | Jan 1993 – Apr 2026 |
| Pan American O-3-15975 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 51.8K | 0 | Oct 2010 – Feb 2025 |
| Amoco-Johnson "B" O-3-21493 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 49.5K | 22 | Jan 1993 – Jan 2005 |
| Oryx Fee O-3-23890 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 48.2K | 0 | Oct 2000 – Apr 2026 |
| Ashe, John B. Fee O-3-3863 | Radco Operations, L.P. only | Sour Lake | Hardin | 3 | 48.1K | 21 | Jan 1993 – Apr 2026 |
| Hardin County Oil Co. O-3-5467 | Rheaco Oil Company, Ltd. only | Sour Lake | Hardin | 14 | 43.8K | 22 | Jan 1993 – Apr 2026 |
| Hooks, C.G. O-3-18110 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 42K | 50 | Jan 1993 – Apr 2026 |
| Balluff O-3-7661 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 40.6K | 22 | Jan 1993 – Apr 2026 |
| Lynn Oil Company O-3-6658 | Radco Operations, L.P. only | Sour Lake | Hardin | 3 | 39.5K | 48 | Jan 1993 – Jan 2025 |
| Royalty Properties, Etal O-3-3813 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 38.5K | 110 | Jan 1993 – Apr 2026 |
| Merchant Estate O-3-3920 | Radco Operations, L.P. only | Sour Lake | Hardin | 1 | 37.8K | 22 | Jan 1993 – Apr 2026 |
| Tarver-Hardin O-3-3894 | Radco Operations only | Sour Lake | Hardin | 18 | 37.6K | 21 | Jan 1993 – Mar 2000 |
| Simms-Hooks O-3-26494 | Radco Operations, L.P. only | Sour Lake | Hardin | 2 | 37.3K | 0 | Aug 2014 – Apr 2026 |
| Minor Oil Co. (Lot C) O-3-10589 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 36.7K | 22 | Jan 1993 – Apr 2026 |
| Houston Oil Co. Fee -A- O-3-3937 | Radco Operations, L.P. only | Sour Lake | Hardin | 4 | 34.8K | 51 | Jan 1993 – Mar 2020 |