| Lambert, M. F. O-2-4001 | Hilcorp Energy Company | Greta (4400) | 12 | 146K | 212K | by Jan 1993 – Aug 2026 |
| Rooke O-2-11255 | San Isidro Development Co, L. C. | Refugio New (6200 Stringer Sd.) | 1 | 145K | 120K | May 2016 – Aug 2026 |
| Miguelita Scanio O-2-8991 | Digital Operating Company LLC | Refugio-Fox (6400) | 1 | 143K | 144K | Aug 2005 – Oct 2021 |
| Wood River Ranch 'B' O-2-10906 | Kebo Oil & Gas, Inc. | Woodsboro, South (8100) | 1 | 142K | 0 | Jun 2014 – Aug 2026 |
| Oconnor -H- O-2-2571 | T-C Oil Company, LLC | Huff (372) | 5 | 142K | 450K | by Jan 1993 – Aug 2026 |
| O'Conner -D- O-2-5957 | T-C Oil Company, LLC | Lake Pasture (H-434) | 12 | 134K | 799K | by Jan 1993 – Aug 2026 |
| O'Connor, Dennis O-2-3014 | T - C Oil Company | Lake Pasture, West (4450) | 8 | 133K | 1.78M | by Jan 1993 – Dec 2000 |
| Williams, Maude et al -A- O-2-5125 | Hilcorp Energy Company | Lake Pasture (FT-730) | 4 | 131K | 365K | by Jan 1993 – Feb 2006 |
| Oconnor, Thomas O-2-4011 | Greta Operating Company LLC | Greta, Deep (5620) | 2 | 130K | 151K | by Jan 1993 – Aug 2026 |
| Welder Ford O-4-13771 | Dallas Petroleum Group, LLC | Taft, West (5600) | 5 | 128K | 31.4K | Feb 2013 – Aug 2026 |
| Obrien, J. J., -A- O-2-3959 | Greta Operating Company LLC | Greta (4400) | 7 | 124K | 48.1K | by Jan 1993 – Apr 2017 |
| O'Connor, Dennis et al -N- O-2-8931 | T-C Oil Company, LLC | Huff (2950 Sand) | 1 | 124K | 130K | Nov 2004 – Aug 2026 |
| Miguelita Scanio O-2-10952 | Digital Operating Company LLC | Refugio Hynes (6400) | 4 | 123K | 122K | Jun 2014 – Dec 2025 |
| Lambert, M.F. O-2-6088 | Hilcorp Energy Company | Tom O'Connor (4150) | 14 | 120K | 314K | by Jan 1993 – Aug 2018 |
| Oconnor, Thos. -D- O-2-1544 | Hilcorp Energy Company | Tom Oconnor | 3 | 120K | 75.3K | by Jan 1993 – Dec 2015 |
| Meoc-Mellon-State Unit O-2-11756 | T-C Oil Company, LLC | Mary Ellen Oconnor (8200) | 1 | 118K | 363K | Jun 2019 – Aug 2026 |
| O'Conner, -E- O-2-6466 | T-C Oil Company, LLC | Huff (2950 Sand) | 2 | 118K | 204K | by Jan 1993 – Jun 2011 |
| Shelton, F. Ben et Al O-2-6733 | Paloma Operating, LLC | Woodsboro (FT-8 Sand) | 2 | 117K | 712 | by Jan 1993 – Jan 2022 |
| Oconnor O-2-4783 | T - C Oil Company | McFaddin (4400) | 10 | 117K | 248K | by Jan 1993 – Dec 1997 |
| Lambert, M. F. O-2-9033 | Hilcorp Energy Company | Tom Oconnor (7750) | 1 | 117K | 299K | Jan 2006 – Jan 2010 |
| Oconnor, Thomas -E- O-2-1526 | T-C Oil Company, LLC | Tom Oconnor | 29 | 116K | 317K | by Jan 1993 – Nov 2010 |
| Obrien, J. M. O-2-3997 | Primrose Operating Company | Greta (4400) | 6 | 116K | 98.9K | by Jan 1993 – May 2005 |
| Vidauri "E" O-2-9205 | Charro Operating, L.L.C. | Phil Power (5200) | 1 | 115K | 381K | Feb 2008 – Nov 2024 |
| Welder 'C' G-2-234179 | Hilcorp Energy Company | Sharps Lake, N. (5040) | 1 | 113K | 310K | Jan 2008 – May 2015 |
| O'Connor O-2-10331 | T-C Oil Company, LLC | Huff (5600) | 3 | 112K | 312K | Aug 2012 – Sep 2023 |
| Shelton, Ben O-2-8558 | Digital Operating Company LLC | Refugio-Fox (6400) | 1 | 112K | 105K | Aug 2000 – Jun 2020 |
| Bauer, Mary Claire et Vir O-2-7849 | Hilcorp Energy Company | Tom Oconnor (6600) | 5 | 111K | 353K | by Jan 1993 – Aug 2010 |
| El Oso Cattle Company O-2-5199 | Dolphin Petroleum, LP | Woodsboro, South (4200) | 12 | 111K | 145K | by Jan 1993 – Aug 2016 |
| Obrien, J. J., -A- O-2-3970 | Greta Operating Company LLC | Greta (4400) | 4 | 108K | 1.34K | by Jan 1993 – Apr 2017 |
| Oconnor, Thomas, -A- O-2-2875 | Hilcorp Energy Company | Tom Oconnor (5900 Sand) | 11 | 107K | 236K | by Jan 1993 – Oct 2008 |
| O'Conner -H- O-2-7095 | T-C Oil Company, LLC | Huff (3500) | 1 | 106K | 197K | by Jan 1993 – Nov 2011 |
| Heard, Clement O-2-4791 | Hilcorp Energy Company | Tom Oconnor (7500) | 4 | 105K | 332K | by Jan 1993 – Oct 2009 |
| Huff Oil Unit 2 O-2-6413 | Great Bay Operations, LLC | Huff (2920) | 2 | 103K | 64.8K | by Jan 1993 – Jul 2002 |
| O'Connor "B" O-2-8680 | Bishop Petroleum Inc. | Train Wreck (5800 SD) | 1 | 102K | 34.5K | Jul 2001 – Jul 2010 |
| Heard, Fannie V.W. Mrs. O-2-6949 | Hilcorp Energy Company | Tom Oconnor (5625 Sand) | 3 | 101K | 157K | by Jan 1993 – Apr 2010 |
| Heard Fannie V.W. Mrs O-2-6800 | Hilcorp Energy Company | Tom O'Connor (4150) | 7 | 101K | 892K | by Jan 1993 – May 2004 |
| O'Connor, Thomas O-2-8827 | Greta Operating Company LLC | Greta, Deep (5700) | 1 | 101K | 170K | Oct 2003 – Apr 2025 |
| Scanio, Miguelita O-2-8611 | Digital Operating Company LLC | Refugio-Fox (6500) | 1 | 101K | 199K | Apr 2001 – Oct 2019 |
| Scanio, Miguelita O-2-9295 | Digital Operating Company LLC | Refugio Old (6200) | 1 | 101K | 99.3K | Jan 2009 – Sep 2021 |
| Obrien, J. M. O-2-3984 | South Texas Operating Company | Greta (4400) | 5 | 100K | 123K | by Jan 1993 – Dec 2012 |
| O'Connor, Dennis et al "G" O-2-8384 | T - C Oil Company | Lake Pasture, West (4500) | 1 | 99.1K | 55.1K | Jun 1998 – Oct 2008 |
| O'Connor, L. W. O-2-7250 | O'Connor Energy Management, LLC | Mary Ellen Oconnor (FS-75) | 5 | 98K | 227K | by Jan 1993 – Dec 2015 |
| Fagan O-2-7924 | Goldking Minerals Mgmt, L.L.C. | McFaddin (4500) | 6 | 97.3K | 85.7K | Oct 1993 – Sep 2017 |
| Sasse O-2-8124 | Rodessa Operating Company | La Rosa (Consolidated, Oil) | 2 | 95.9K | 16.3K | Nov 1995 – Jul 2006 |
| Heard, Clement O-2-8936 | Hilcorp Energy Company | Tom Oconnor (4600) | 2 | 95.3K | 56.2K | Nov 2004 – Aug 2017 |
| Copano Gas Unit O-2-7946 | T - C Oil Company | Tom Oconnor (5250) | 3 | 94.7K | 231K | Feb 1994 – Jan 2001 |
| Marberry O-2-9181 | Allegiant Resources, LLC | McFaddin (4400) | 3 | 92K | 19.3K | Apr 2008 – Mar 2023 |
| Jacks et Al O-2-8657 | Neumin Production Company | Big Jim (Third Sinton) | 1 | 91.7K | 65.7K | Aug 2001 – Feb 2004 |
| Vidauri "F" O-2-9263 | Charro Operating, L.L.C. | Vidauri (5800) | 1 | 91.4K | 267K | Jul 2008 – Sep 2016 |
| Williams, Maude, Etal -A- O-2-2526 | Hilcorp Energy Company | Lake Pasture (FT-560) | 4 | 89.7K | 207K | by Jan 1993 – Aug 2020 |