| Williams, Maude, Etal -A- O-2-2533 | Hilcorp Energy Company only | Lake Pasture (H-440 Sand) | Refugio | 176 | 11.1M | 179M | Jan 1993 – Apr 2026 |
| T-C Oil Co.- O'Connor O-2-2554 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 114 | 6.52M | 31.4M | Jan 1993 – Apr 2026 |
| Oconnor, Dennis, Etal -L- O-2-2845 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 81 | 3.49M | 48.5M | Jan 1993 – Apr 2026 |
| Lambert, M. F. O-2-2115 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 45 | 1.73M | 2.54M | Jan 1993 – Apr 2026 |
| Oconnor -D- O-2-2834 | T-C Oil Company, LLC only | Lake Pasture (H-440 Sand) | Refugio | 25 | 1.32M | 5.82M | Jan 1993 – Apr 2026 |
| Heard, Fannie V. W. O-2-3977 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 11 | 887K | 965K | Jan 1993 – Apr 2026 |
| Heard, J. F. B. O-2-3978 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 17 | 869K | 1.83M | Jan 1993 – Apr 2026 |
| Mellon Oil Unit O-2-2192 | T-C Oil Company, LLC only | Tom Oconnor (4400) | Refugio | 28 | 852K | 451K | Jan 1993 – Mar 2015 |
| Heard, Claude E. et Al O-2-1798 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 19 | 760K | 407K | Jan 1993 – Apr 2026 |
| O'Connor O-2-8367 | T-C Oil Company, LLC only | Huff (4400) | Refugio | 19 | 693K | 597K | Jan 1998 – Apr 2026 |
| Lambert, M. F. O-2-2003 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 21 | 661K | 1.24M | Jan 1993 – Mar 2020 |
| Lambert, M. F. O-2-3976 | Hilcorp Energy Company only | Greta (4400) | Refugio | 14 | 497K | 399K | Jan 1993 – Apr 2020 |
| BP O-2-8324 | Gilster, Ralph R. III only | Lake Pasture, West (4450) | Refugio | 26 | 485K | 839K | Nov 1997 – Dec 2000 |
| Heard, J. F. B.- Tex O-2-3996 | Greta Operating Company LLC only | Greta (4400) | Refugio | 15 | 403K | 219K | Jan 1993 – Apr 2026 |
| O'Brien, J. M. O-2-3981 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 10 | 380K | 252K | Jan 1993 – Apr 2026 |
| O'Connor O-2-11800 | T-C Oil Company, LLC only | McFaddin (4400) | Refugio | 15 | 354K | 164K | Jul 2019 – Apr 2026 |
| Heard, F. V. W. O-2-3994 | Greta Operating Company LLC only | Greta (4400) | Refugio | 3 | 310K | 160K | Jan 1993 – Apr 2026 |
| Obrien, J. J., -B- O-2-3960 | Greta Operating Company LLC only | Greta (4400) | Refugio | 4 | 273K | 40.8K | Jan 1993 – Nov 2024 |
| Oconnor, Thos. O-2-3990 | Greta Operating Company LLC only | Greta (4400) | Refugio | 6 | 147K | 51.5K | Feb 1998 – Apr 2026 |
| Lambert, M. F. O-2-4001 | Hilcorp Energy Company only | Greta (4400) | Refugio | 12 | 139K | 211K | Jan 1993 – Apr 2026 |
| O'Connor, Dennis O-2-3014 | T - C Oil Company only | Lake Pasture, West (4450) | Refugio | 8 | 133K | 1.78M | Jan 1993 – Dec 2000 |
| Obrien, J. J., -A- O-2-3959 | Greta Operating Company LLC only | Greta (4400) | Refugio | 7 | 124K | 48.1K | Jan 1993 – Apr 2017 |
| Oconnor O-2-4783 | T - C Oil Company only | McFaddin (4400) | Refugio | 10 | 117K | 248K | Jan 1993 – Dec 1997 |
| Obrien, J. M. O-2-3997 | Primrose Operating Company only | Greta (4400) | Refugio | 6 | 116K | 98.9K | Jan 1993 – May 2005 |
| Obrien, J. J., -A- O-2-3970 | Greta Operating Company LLC only | Greta (4400) | Refugio | 4 | 108K | 1.34K | Jan 1993 – Apr 2017 |
| Obrien, J. M. O-2-3984 | South Texas Operating Company only | Greta (4400) | Refugio | 5 | 100K | 123K | Jan 1993 – Dec 2012 |
| Marberry O-2-9181 | Allegiant Resources, LLC only | McFaddin (4400) | Refugio | 3 | 92K | 19.3K | Apr 2008 – Mar 2023 |
| Oconnor, Thos. O-2-4000 | Acock/Anaqua Operating Co., LP only | Greta (4400) | Refugio | 4 | 84.4K | 135K | Jan 1993 – Oct 2010 |
| Oconnor, T. O-2-3969 | Acock/Anaqua Operating Co., LP only | Greta (4400) | Refugio | 7 | 84.1K | 10.3K | Jan 1993 – Sep 2004 |
| Heard, J. F. B. O-2-3958 | Acock/Anaqua Operating Co., LP only | Greta (4400) | Refugio | 1 | 77.2K | 142 | Jan 1993 – Aug 2005 |
| Fagan O-2-9045 | Allegiant Resources, LLC only | McFaddin (4400) | Refugio | 6 | 77.2K | 75.5K | May 2009 – May 2021 |
| Obrien,j.m.,-A- East 101 Ac. 6 O-2-3992 | Dewbre Petroleum Corporation only | Greta (4400) | Refugio | 4 | 76.2K | 46.6K | Jan 1993 – Apr 2026 |
| Marberry B O-2-10926 | Allegiant Resources, LLC only | McFaddin (4400) | Refugio | 4 | 70K | 60.3K | May 2014 – Sep 2020 |
| Obrien, J. M., -B- O-2-3980 | Acock/Anaqua Operating Co., LP only | Greta (4400) | Refugio | 5 | 65.9K | 173K | Jan 1993 – Mar 2003 |
| J.M. O'Brien JLB O-2-12584 | South Texas Operating Company only | Greta (4400) | Refugio | 1 | 57.7K | 0 | Dec 2022 – Apr 2026 |
| O'Connor, Thomas "A" O-2-8686 | Hilcorp Energy Company only | Tom Oconnor (5440) | Refugio | 2 | 55K | 146K | Jan 2002 – Oct 2024 |
| Huff, G. O-2-5135 | Great Bay Operations, LLC only | McFaddin (4400) | Refugio | 1 | 45K | 71.5K | Jan 1993 – Aug 2009 |
| J.F.B. Heard-Arco O-2-11011 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 42.4K | 25K | Oct 2014 – Apr 2026 |
| O'Connor, Thomas O-2-9447 | Dorchester Operating Company LLC only | Greta (4400) | Refugio | 1 | 37.8K | 5.39K | Nov 2010 – Apr 2026 |
| O'Connor O-2-12435 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 36.8K | 17.3K | Jun 2022 – Apr 2026 |
| Lambert E, M.F. O-2-12823 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 3 | 35.3K | 937 | Nov 2023 – Apr 2026 |
| Copano Gas Unit O-2-3669 | T - C Oil Company only | Tom Oconnor (5440) | Refugio | 1 | 32.4K | 72.5K | Jan 1993 – Nov 2007 |
| Heard, Ira "B" O-2-9238 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 1 | 25.3K | 58.1K | Jul 2008 – Oct 2022 |
| Fagan C O-2-10830 | Allegiant Resources, LLC only | McFaddin, N. (4450) | Refugio | 1 | 23.2K | 12.8K | Sep 2013 – Dec 2022 |
| Marberry O-2-10057 | Allegiant Resources, LLC only | McFaddin, N. (4450) | Refugio | 3 | 19.9K | 5.97K | Aug 2011 – Nov 2018 |
| Heard, Clement O-2-7842 | Hilcorp Energy Company only | Tom Oconnor (4400) | Refugio | 1 | 16.5K | 56.2K | Jan 1993 – Feb 2006 |
| Fagan O-2-9347 | Allegiant Resources, LLC only | McFaddin, N. (4450) | Refugio | 1 | 16.2K | 15.7K | Oct 2009 – Jan 2016 |
| J.M. O'Brien 'J' O-2-11193 | Greta Operating Company LLC only | Greta (4400) | Refugio | 1 | 12.8K | 17.8K | Jan 2016 – Jul 2020 |
| Marberry B O-2-10927 | Allegiant Resources, LLC only | McFaddin, N. (4450) | Refugio | 1 | 12.4K | 5.47K | Apr 2014 – Jun 2017 |
| Marberry O-2-9520 | Great Bay Operations, LLC only | McFaddin (4400) | Refugio | 1 | 10.5K | 243 | Oct 2009 – Dec 2014 |