| Clay Pasture -E- State Unit O-2-12263 | T-C Oil Company, LLC | Anaqua (4100) | 1 | 17.5K | 15.2K | Aug 2021 – May 2026 |
| Heard, Claud E., et Al O-2-2872 | Hilcorp Energy Company | Tom Oconnor (5900 Sand) | 7 | 17.5K | 59.4K | by Jan 1993 – Apr 2007 |
| Welder-Terrell G-2-230170 | C & E Operating, Inc. | Devils Run (Chamberlain 3A) | 1 | 17.4K | 917K | May 2007 – Mar 2016 |
| Maude Williams et al 'B' O-2-11161 | Hilcorp Energy Company | Tom Oconnor (5500 Sand) | 3 | 17.1K | 8.96K | Nov 2015 – Nov 2023 |
| Williams, Maude et al "A" O-2-8998 | Hilcorp Energy Company | Lake Pasture (FT-585) | 1 | 17.1K | 89.9K | Sep 2005 – Apr 2010 |
| L. Wood Est. O-2-8682 | Cummins & Walker Oil Co., Inc. | Woodsboro, West (4950) | 1 | 17.1K | 7.32K | Jan 2002 – Apr 2004 |
| Willow Creek -B- G-2-234324 | T-C Oil Company, LLC | Willow Creek (8000) | 1 | 16.9K | 289K | Mar 2008 – May 2010 |
| Lambert, M. F. G-2-144497 | Devon Energy Production Co, L.P. | Siene Bean (6960) | 1 | 16.9K | 1.15M | by Jan 1993 – Oct 1996 |
| W. J. Fox 'A' O-2-10746 | Hilcorp Energy Company | Hynes Ranch (7000) | 1 | 16.9K | 48.4K | Jan 2014 – Sep 2015 |
| Rooke, P. H. O-2-5467 | 38 Oil & Gas, L.L.C. | Refugio, New (6200 B) | 1 | 16.9K | 39.9K | by Jan 1993 – Mar 2004 |
| W. J. Fox 'A' O-2-11007 | Hilcorp Energy Company | Hynes Ranch (FD-37) | 1 | 16.9K | 20.7K | Oct 2015 – Mar 2021 |
| Wood, L. Est. O-2-8504 | Momentum Energy Corporation | Murphy L. (7000) | 1 | 16.8K | 45.6K | Feb 2000 – Jun 2003 |
| Heard, Clement O-2-7842 | Hilcorp Energy Company | Tom Oconnor (4400) | 1 | 16.5K | 56.2K | by Jan 1993 – Feb 2006 |
| Fagan O-2-9347 | Goldking Minerals Mgmt, L.L.C. | McFaddin, N. (4450) | 1 | 16.2K | 15.7K | Oct 2009 – Jan 2016 |
| Crews G-2-195121 | Christopher Oil & Gas Inc | La Rosa (6750, Below, Gas) | 1 | 16.1K | 268K | May 2003 – Jan 2009 |
| Hynes O-2-6206 | Magnum Producing, LP | Papalote, E. (5950) | 1 | 15.9K | 14.2K | by Jan 1993 – Dec 1996 |
| Schirmer "C-120" O-2-8229 | Christopher Oil & Gas Inc | Bonnie View (5400) | 1 | 15.7K | 44.2K | Dec 1996 – Apr 1998 |
| Williams, Maude Etal -B- O-2-8737 | Hilcorp Energy Company | Tom Oconnor (8000) | 1 | 15.7K | 294K | Aug 2002 – Sep 2022 |
| Kentucky-Fagan O-2-8711 | Anderson Oil Ltd. | Fagan (Tilly Thomas) | 1 | 15.7K | 4.74K | May 2002 – Sep 2004 |
| Fagan O-2-9345 | Great Bay Operations, LLC | McFaddin (4500) | 1 | 15.4K | 9.5K | Oct 2009 – Jul 2011 |
| Lambert, M. F. -C- O-2-3456 | H & D Operating Company | Refugio-Fox (5800) | 1 | 15.1K | 18.1K | by Jan 1993 – Apr 1998 |
| Scanio, Miguelita G-2-234584 | Digital Operating Company LLC | Refugio Old (6550 Frio) | 1 | 15K | 615K | Dec 2007 – Nov 2025 |
| Fox, W. J. -A- O-2-5194 | Hilcorp Energy Company | Hynes Ranch (5800 Frio Upper) | 1 | 14.9K | 56.5K | Feb 1993 – Jan 2002 |
| Heard-State Unit #2 O-2-7641 | CTR Petroleum, Inc. | Refugio New (3670) | 1 | 14.9K | 7.47K | by Jan 1993 – Sep 1997 |
| O'Brien, J. M. "E" G-2-231786 | Greta Operating Company LLC | Greta, W. (6300) | 1 | 14.5K | 569K | Jun 2007 – Aug 2026 |
| Heard, J. F. B. G-2-218347 | Greta Operating Company LLC | Greta, North (6100) | 1 | 14.4K | 317K | Dec 2005 – Oct 2014 |
| Reilly, Annie et Vir O-2-10577 | Hilcorp Energy Company | Tom Oconnor (3550) | 1 | 14.1K | 4.19K | Aug 2013 – Aug 2019 |
| Williams, Maude et al "A" O-2-9077 | Hilcorp Energy Company | Lake Pasture (FT-740) | 1 | 13.7K | 45.1K | Jun 2006 – Apr 2008 |
| Scanio / Shelton G-2-223050 | High Plains Gas Systems, Inc. | Mission River (8300 Vksbg) | 1 | 13.7K | 874K | Mar 2006 – Nov 2010 |
| Mary F. Lambert -E- O-2-9435 | Hilcorp Energy Company | Tom Oconnor (5200, East) | 1 | 13.4K | 20.9K | May 2010 – May 2017 |
| Roche O-2-6905 | Prevail Energy, Incorporated | Crass (Sinton) | 1 | 13.2K | 109 | by Jan 1993 – Mar 2013 |
| Clay Pasture -B- State Unit O-2-13103 | T-C Oil Company, LLC | Anaqua (2960) | 1 | 13.1K | 10.5K | May 2025 – Aug 2026 |
| Maude Williams et al 'A' O-2-10857 | Hilcorp Energy Company | Lake Pasture (FT-750) | 1 | 13.1K | 15.9K | Sep 2014 – Aug 2015 |
| Heard, F.V.W. "B" O-2-7982 | CTR Petroleum, Inc. | Refugio Heard (6300) | 1 | 13.1K | 83K | Aug 1994 – May 2003 |
| Miguelita Scanio O-2-10419 | Acock/Anaqua Operating Co., LP | Refugio-Fox (6450 Stringer) | 2 | 13.1K | 104K | Nov 2012 – Mar 2020 |
| Welder Heirs G-2-170630 | C & E Operating, Inc. | Peponi Ranch (Frio 4800) | 1 | 13.1K | 3.34M | Sep 1998 – Jun 2011 |
| Rooke O-2-8672 | Rodessa Operating Company | La Rosa (Consolidated, Oil) | 1 | 13.1K | 2.67K | Oct 2001 – Jan 2009 |
| Rooke. P.H. O-2-7918 | 38 Oil & Gas, L.L.C. | Refugio, New (5700) | 1 | 12.8K | 41.5K | Oct 1993 – Feb 1997 |
| O'Connor, M.V. Estate O-2-6472 | Freeman, James C. | Greta (Massive Catahoula) | 1 | 12.8K | 10K | by Jan 1993 – Apr 2000 |
| Rooke, F. B. 4 G-2-175949 | C & E Operating, Inc. | Woodsboro, West (Frio 6600) | 1 | 12.8K | 243K | Nov 1999 – Jan 2005 |
| Heard, Wilson "B" O-2-8631 | Hilcorp Energy Company | Tom Oconnor | 1 | 12.8K | 62.3K | Jun 2001 – Oct 2002 |
| J.M. O'Brien 'J' O-2-11193 | Greta Operating Company LLC | Greta (4400) | 1 | 12.8K | 17.8K | Jan 2016 – Jul 2020 |
| Spaulding, J.W. O-2-8017 | Rising Star Energy Partners II, | La Rosa (Consolidated, Oil) | 4 | 12.8K | 102K | Aug 1998 – May 2003 |
| O'Connor, Mary Ellen O-2-8485 | Emerald Oil & Gas LC | Mary Ellen Oconnor (FT-18 Sand) | 1 | 12.7K | 31.8K | Apr 1996 – May 2003 |
| Bauer, Mary Claire et Vir O-2-8802 | Hilcorp Energy Company | Greta (C-1) | 1 | 12.6K | 75.7K | Jan 2003 – Jan 2010 |
| Oconnor, Thomas, -A- O-2-2864 | T-C Oil Company, LLC | Tom Oconnor (5900 Sand) | 3 | 12.5K | 47.9K | by Jan 1993 – Jun 1998 |
| Wood River Ranch 'B' O-2-10234 | Kebo Oil & Gas, Inc. | Woodsboro (6500) | 1 | 12.5K | 6.79K | May 2012 – Mar 2016 |
| Swyka G-2-170636 | C & E Operating, Inc. | Peponi Ranch (Frio 4800) | 1 | 12.5K | 2.74M | Sep 1998 – Jul 2011 |
| Marberry B O-2-10927 | Allegiant Resources, LLC | McFaddin, N. (4450) | 1 | 12.4K | 5.47K | Apr 2014 – Jun 2017 |
| Fagan C O-2-10547 | Great Bay Operations, LLC | McFaddin (5600 North) | 1 | 12.4K | 20.9K | Jan 2013 – Jan 2014 |