| Miguelita Scanio O-2-9060 | Acock/Anaqua Operating Co., LP | Refugio-Fox (6750) | 2 | 89.3K | 142K | Jun 2006 – Oct 2012 |
| Heard, A. W. J. O-2-1349 | Paleo Oil Company LLC | Refugio Heard (Area) | 3 | 87.1K | 89.7K | by Jan 1993 – Jul 2026 |
| O'Conner, Mary Ellen O-2-5612 | Dolphin Petroleum, LP | Mary Ellen Oconnor (D-1) | 12 | 86.9K | 486K | by Jan 1993 – Jul 2016 |
| Fagan O-2-6479 | Goldking Minerals Mgmt, L.L.C. | McFaddin (5600) | 2 | 86.7K | 11.8K | by Jan 1993 – Oct 2007 |
| Lambert, M.F. O-2-6619 | Hilcorp Energy Company | Tom Oconnor (5250) | 5 | 85.7K | 295K | by Jan 1993 – Nov 2023 |
| Welder Ford G-4-266216 | Dallas Petroleum Group, LLC | Taft, West (5600) | 1 | 85K | 128K | Apr 2012 – May 2017 |
| Oconnor, Thos. O-2-4000 | Acock/Anaqua Operating Co., LP | Greta (4400) | 4 | 84.4K | 135K | by Jan 1993 – Oct 2010 |
| Oconnor, T. O-2-3969 | Acock/Anaqua Operating Co., LP | Greta (4400) | 7 | 84.1K | 10.3K | by Jan 1993 – Sep 2004 |
| Heard, Claude E. et Al O-2-9330 | Hilcorp Energy Company | Tom Oconnor, N. (5150) | 3 | 84K | 22K | Jun 2009 – Aug 2026 |
| Wood, L. Est. O-2-8890 | Cummins & Walker Oil Co., Inc. | Woodsboro (5600 Sand) | 1 | 83.6K | 23K | Jun 2004 – Dec 2019 |
| Hynes O-2-6739 | Magnum Producing, LP | Papalote, E. (6000) | 3 | 83.2K | 43.9K | by Jan 1993 – Jul 2006 |
| St. John Heirs O-2-2211 | Paloma Operating, LLC | Woodsboro (FT-8 Sand) | 1 | 83.1K | 28 | by Jan 1993 – Aug 2026 |
| Buck, I. G. W. O-2-176 | Bent Wing Energy, LLC | Bonnie View | 7 | 80.7K | 18.6K | by Jan 1993 – Jul 2005 |
| Lambert, M. F. O-2-4902 | Hilcorp Energy Company | Tom Oconnor (5450 Sand) | 4 | 79.3K | 106K | by Jan 1993 – Mar 2020 |
| Shelton G-2-208006 | Neumin Production Company | Refugio-Fox (5500) | 1 | 78.4K | 144K | Dec 2004 – Oct 2009 |
| Heard, J. F. B. O-2-3958 | Acock/Anaqua Operating Co., LP | Greta (4400) | 1 | 77.2K | 142 | by Jan 1993 – Aug 2005 |
| Fagan O-2-9045 | Goldking Minerals Mgmt, L.L.C. | McFaddin (4400) | 6 | 77.2K | 75.5K | May 2009 – May 2021 |
| Obrien,j.m.,-A- East 101 Ac. 6 O-2-3992 | Dewbre Petroleum Corporation | Greta (4400) | 4 | 76.5K | 46.6K | by Jan 1993 – Aug 2026 |
| O Connor, Thos. -B- O-2-964 | Hilcorp Energy Company | Mary Ellen Oconnor (FQ-40 Sand) | 11 | 75.5K | 186K | by Jan 1993 – Mar 2018 |
| Reilly, Annie et Vir O-2-6938 | Hilcorp Energy Company | Tom O'Connor (4150) | 2 | 75K | 506K | by Jan 1993 – May 2004 |
| Willow Creek -B- G-2-231490 | T - C Oil Company | Willow Creek (8000) | 1 | 74.8K | 166K | Nov 2007 – Aug 2010 |
| Miguelita Scanio O-2-9442 | Digital Operating Company LLC | Tom Oconnor (6550) | 1 | 74.3K | 51.3K | Jun 2010 – Dec 2022 |
| Lambert, M.F. O-2-8970 | Hilcorp Energy Company | Tom O'Connor (8000, West) | 4 | 74K | 606K | Apr 2005 – Jul 2013 |
| Thomas O'Connor O-2-10977 | Greta Operating Company LLC | Greta (6400) | 1 | 74K | 97.6K | Aug 2014 – Jul 2025 |
| Miguelita Scanio O-2-9169 | Acock/Anaqua Operating Co., LP | Tom Oconnor (6775) | 1 | 73.9K | 182K | Aug 2007 – Aug 2016 |
| Williams, Maude Etal -B- O-2-5559 | Hilcorp Energy Company | Tom Oconnor (5650' Sand) | 8 | 73.5K | 156K | Jun 1993 – Jul 2015 |
| Schirmer-Buck "a" Unit O-2-9488 | Bent Wing Energy, LLC | Bonnie View (5400) | 2 | 72.6K | 154K | Nov 2010 – Aug 2026 |
| Miguelita Scanio G-2-244399 | Acock/Anaqua Operating Co., LP | Refugio-Fox (6600) | 1 | 72.3K | 175K | Oct 2008 – Jan 2019 |
| O'Connor, Thomas, "D" O-2-1066 | Hilcorp Energy Company | Melon Creek | 6 | 71K | 211K | by Jan 1993 – Jun 2015 |
| Clement Heard 42 O-2-11813 | Hilcorp Energy Company | Tom Oconnor (4500 Greta Mass.) | 1 | 70.3K | 8.26K | Aug 2019 – Aug 2026 |
| Marberry B O-2-10926 | Goldking Minerals Mgmt, L.L.C. | McFaddin (4400) | 4 | 70K | 60.3K | May 2014 – Sep 2020 |
| Heard, Mrs. Fannie V. W. O-2-8418 | Hilcorp Energy Company | Tom Oconnor (5250) | 3 | 69K | 106K | Dec 1998 – Jan 2020 |
| O'Connor-H-Clay Past-State Unit O-2-11509 | T-C Oil Company, LLC | Anaqua (5300) | 1 | 68.9K | 198K | Apr 2018 – May 2024 |
| O'Connor, Thomas "A" O-2-7360 | Hilcorp Energy Company | Tom O'Connor (4150) | 3 | 68.8K | 57K | by Jan 1993 – May 2004 |
| Williams, Maude et al -C- O-2-1547 | Hilcorp Energy Company | Tom Oconnor | 7 | 68K | 70.6K | by Jan 1993 – Oct 2005 |
| Williams, Maude, Etal -B- O-2-1546 | Hilcorp Energy Company | Tom Oconnor | 10 | 67.9K | 115K | by Jan 1993 – Feb 2024 |
| Lambert, M. F. O-2-8638 | Hilcorp Energy Company | Tom Oconnor (5900 Sand) | 3 | 67.8K | 132K | Mar 2003 – Oct 2010 |
| Heard, F. V. W. O-2-8731 | Greta Operating Company LLC | Greta, Deep (5400) | 1 | 66.8K | 264K | Aug 2002 – May 2025 |
| Obrien, J. M., -B- O-2-3980 | Acock/Anaqua Operating Co., LP | Greta (4400) | 5 | 65.9K | 173K | by Jan 1993 – Mar 2003 |
| Anderson, Mary Alice et al "A" O-2-8571 | Maran Oil Company | Fagan (5830) | 2 | 65.7K | 90.2K | Nov 2000 – Feb 2015 |
| Meoc-Mellon-State Unit G-2-295806 | T-C Oil Company, LLC | Mary Ellen O'Connor (8300) | 1 | 65.2K | 169K | May 2023 – Aug 2026 |
| Maude Williams et al "C" O-2-9440 | Hilcorp Energy Company | Tom Oconnor (5800) | 1 | 64.8K | 38.3K | Jun 2010 – Jul 2016 |
| Miguelita Scanio O-2-10125 | Paloma Operating, LLC | Tom Oconnor (6600) | 1 | 64.3K | 60.7K | Dec 2011 – Jun 2023 |
| Schirmer-Buck Unit O-2-8663 | Remora Management, LLC | Bonnie View (4700) | 1 | 63.5K | 4.52K | Aug 2001 – Feb 2015 |
| M. F. Lambert -A- O-2-10570 | Hilcorp Energy Company | Tom O'Connor (6400, West) | 1 | 63.2K | 116K | Jun 2013 – Jun 2023 |
| Miguelita Scanio O-2-9372 | Digital Operating Company LLC | Tom O'Connor (6700) | 1 | 62.8K | 82.2K | Sep 2009 – Jul 2016 |
| Barber Unit O-2-8627 | Momentum Energy Corporation | Agnes Barber (Chamberlain 2ND) | 1 | 61.8K | 57.1K | May 2001 – Feb 2016 |
| Oconnor, Thomas -C- O-2-1543 | Hilcorp Energy Company | Tom Oconnor | 11 | 61.5K | 88.8K | by Jan 1993 – Oct 2009 |
| Rooke, P. H. O-2-2435 | 38 Oil & Gas, L.L.C. | Refugio New (6150 Sand) | 5 | 60.8K | 142K | by Jan 1993 – Jan 2008 |
| J.M. O'Brien JLB O-2-12584 | South Texas Operating Company | Greta (4400) | 1 | 60.8K | 0 | Dec 2022 – Aug 2026 |