| Baumgartner -A- G-2-275006 | T-C Oil Company, LLC | Dudley Campbell (Frio 6200) | 1 | 23.9K | 91.5K | Sep 2014 – May 2017 |
| Thomas O'Connor "B" O-2-9383 | Hilcorp Energy Company | Melon Creek (5870) | 1 | 23.7K | 15.5K | Dec 2009 – Feb 2014 |
| Willow Creek-B- G-2-231739 | T-C Oil Company, LLC | Willow Creek (8000) | 1 | 23.6K | 318K | Oct 2007 – Jul 2011 |
| Scanio, Miguelita G-2-207964 | Digital Operating Company LLC | Refugio-Fox (6600) | 1 | 23.6K | 253K | Nov 2004 – May 2020 |
| Mary Claire Bauer et Vir O-2-10664 | Hilcorp Energy Company | Tom Oconnor (6300) | 1 | 23.4K | 26.6K | Sep 2013 – Apr 2016 |
| Fagan C O-2-10830 | Goldking Minerals Mgmt, L.L.C. | McFaddin, N. (4450) | 1 | 23.2K | 12.8K | Sep 2013 – Dec 2022 |
| Thomas O'Connor 'A' O-2-11391 | Hilcorp Energy Company | Tom Oconnor (5200, East) | 3 | 22.9K | 17.5K | Aug 2017 – Aug 2026 |
| Welder, J.F. Heirs O-2-6543 | Harvey Brothers Oil & Gas | Devils Run (5970 Frio) | 2 | 22.9K | 24 | by Jan 1993 – Jan 1999 |
| Schirmer, Henry O-2-8878 | Remora Management, LLC | Bonnie View (5200) | 1 | 22.9K | 170K | Feb 2004 – Aug 2016 |
| Roche G-2-231460 | Salida Exploration, LLC | Roche, S. (Chamberlain) | 1 | 22.7K | 199K | Oct 2007 – Jan 2009 |
| Williams, Maude et al "A" O-2-8974 | Hilcorp Energy Company | Lake Pasture (FT-570) | 1 | 22.7K | 72.6K | May 2005 – Jun 2013 |
| Rooke O-2-11346 | San Isidro Development Co, L. C. | Refugio, New (6200 B) | 1 | 22.3K | 17.2K | May 2017 – Jul 2026 |
| Annie Reilly, et Vir O-2-9958 | Hilcorp Energy Company | Tom Oconnor (4600) | 1 | 22.2K | 8.3K | Nov 2011 – Jul 2015 |
| O'Connor, Martin -B- O-2-9009 | T - C Oil Company | Lower River Pasture (7800) | 1 | 22.1K | 88.6K | Sep 2005 – Aug 2007 |
| Heard, F. V. W. O-2-8920 | Dorchester Operating Company LLC | Greta, West (F-5) | 1 | 22.1K | 26.3K | Oct 2004 – Sep 2008 |
| Welder "C" O-2-8179 | Wiser Oil Company, The | Phil Power (5200) | 1 | 21.6K | 62.4K | Jun 1996 – Dec 1998 |
| Demmer O-2-8024 | CTR Petroleum, Inc. | La Rosa (Consolidated, Oil) | 1 | 21.5K | 3.05K | Jan 1995 – Apr 2009 |
| O'Connor, L. W. 2 O-2-9036 | O'Connor Energy Management, LLC | Mary Ellen O'Connor (5500 Sand) | 1 | 21.3K | 2.17K | Sep 2006 – Dec 2015 |
| Williams, Maude et al "A" O-2-8825 | Hilcorp Energy Company | Lake Pasture (FT-750) | 1 | 21K | 40.7K | Nov 2003 – Jul 2004 |
| Wilson Heard 'B' O-2-10161 | Hilcorp Energy Company | Tom Oconnor | 1 | 20.8K | 8.43K | Apr 2012 – Jul 2025 |
| L.W. O'Connor 2 O-2-9043 | O'Connor Energy Management, LLC | Mary Ellen Oconnor (Stray 5400) | 1 | 20.6K | 53.2K | Mar 2006 – May 2015 |
| Claude E. Heard, et Al O-2-10996 | Hilcorp Energy Company | Tom Oconnor (5200, East) | 2 | 20.5K | 6.24K | Jan 2018 – Jan 2023 |
| Schirmer, Henry O-2-5426 | Bent Wing Energy, LLC | Bonnie View (4550 Stringer) | 1 | 20.5K | 16.7K | by Jan 1993 – Feb 2001 |
| Scanio/Shelton G-2-212390 | Acock/Anaqua Operating Co., LP | Mission River | 1 | 20.4K | 196K | Apr 2005 – Apr 2015 |
| Roche (6000 Sand) Unit G-2-152225 | H & D Operating Company | Roche (6000 Sand) | 1 | 20.4K | 1.79M | Nov 1994 – Jan 2000 |
| Roche O-2-7203 | D&H-S-S Production Co.,inc | Crass (5500) | 1 | 20.3K | 21 | by Jan 1993 – Feb 2000 |
| O'Connor, Dennis et al "N" O-2-7844 | T - C Oil Company | Huff (5290) | 1 | 20.2K | 159K | by Jan 1993 – Nov 2002 |
| Fagan O-2-8862 | Great Bay Operations, LLC | McFaddin (5000) | 1 | 20.2K | 23.9K | Oct 2003 – Sep 2009 |
| Marberry O-2-10057 | Allegiant Resources, LLC | McFaddin, N. (4450) | 3 | 19.9K | 5.97K | Aug 2011 – Nov 2018 |
| Roche O-2-9265 | Salida Exploration, LLC | Cactus (Frio Massive) | 3 | 19.9K | 275K | Jun 2008 – Jun 2010 |
| Terrell Ranch "C" O-2-8188 | Wiser Oil Company, The | Devil's Run (6600) | 1 | 19.6K | 845 | Jul 1996 – May 1998 |
| Salt Creek -A- G-2-236778 | T - C Oil Company | Salt Creek Ranch (8400) | 1 | 19.4K | 888K | Jun 2007 – Jul 2009 |
| O'Brien, J. J. O-2-12233 | Greta Operating Company LLC | Greta (5800) | 1 | 19.1K | 17.8K | Oct 2021 – Aug 2026 |
| Oconnor, Mary Ellen O-2-3126 | Dolphin Petroleum, LP | Mary Ellen Oconnor (FQ- 9) | 3 | 19.1K | 45.2K | by Jan 1993 – Jul 2016 |
| Marberry O-2-3433 | Anderson Oil Ltd. | McFaddin (5600) | 1 | 19.1K | 16 | by Jan 1993 – Feb 2006 |
| Heard, A.W.J. -C- O-2-6091 | CTR Petroleum, Inc. | Refugio Heard (Area) | 2 | 18.8K | 67.3K | by Jan 1993 – Mar 1998 |
| Roche (6000 Sand) Unit G-2-147914 | H & D Operating Company | Roche (6000 Sand) | 1 | 18.7K | 1.66M | Oct 1993 – Oct 1998 |
| Scanio Shelton G-2-252998 | Paloma Operating, LLC | Mission River (6100) | 1 | 18.7K | 57.8K | May 2009 – Jun 2023 |
| Barber O-2-8156 | Mercy Oil and Gas, LP | Blanco Creek (5790) | 1 | 18.6K | 24.3K | Mar 1996 – Nov 2001 |
| Tract 72 G-2-150100 | Kebo Oil & Gas, Inc. | Refugio-Fox (6400) | 1 | 18.4K | 1.28M | Mar 1994 – Dec 2014 |
| Lambert Gas Unit G-2-234183 | Hilcorp Energy Company | Tom Oconnor (7930) | 1 | 18.2K | 887K | Jan 2008 – Feb 2009 |
| Roche G-2-175282 | Wiser Oil Company, The | Cactus (Frio Massive) | 1 | 18.2K | 319K | Jun 1999 – Jun 2001 |
| Lambert, M. F. O-2-4108 | Hilcorp Energy Company | Tom Oconnor (5425 Sand) | 1 | 18K | 57.8K | by Jan 1993 – Jul 1998 |
| Braman -H- G-2-300399 | T-C Oil Company, LLC | Braman (8200) | 1 | 18K | 444K | May 2025 – Aug 2026 |
| Roche, K.D. -A- G-2-128541 | H & D Operating Company | Roche (-B-) | 1 | 17.9K | 374K | by Jan 1993 – Jan 1996 |
| Reilly, Annie et Vir O-2-4801 | Hilcorp Energy Company | Tom Oconnor (6600) | 2 | 17.9K | 97.7K | by Jan 1993 – Jun 2002 |
| Scanio Shelton O-2-9224 | Acock/Anaqua Operating Co., LP | Mission River (6400) | 1 | 17.8K | 32.8K | Apr 2008 – Feb 2015 |
| Lambert, M. F. O-2-2866 | H & D Operating Company | Tom Oconnor (5900 Sand) | 7 | 17.5K | 30.4K | by Jan 1993 – Sep 1994 |
| Schmidt G-2-170253 | C & E Operating, Inc. | Peponi Ranch (Frio 4800) | 1 | 17.5K | 779K | Aug 1998 – Apr 2011 |
| Welder Heirs G-2-232689 | Kebo Oil & Gas, Inc. | Lake Pasture (FT-690) | 1 | 17.5K | 754K | Sep 2007 – Jul 2013 |