| O'Connor, Thomas -C- O-2-2876 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 59 | 2.99M | 2.17M | Jan 1993 – Apr 2026 |
| Heard, Fannie, V. W., Mrs. O-2-2874 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 43 | 1.63M | 1.67M | Jan 1993 – Aug 2023 |
| Heard, Clement O-2-2873 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 22 | 1.22M | 1.07M | Jan 1993 – Apr 2026 |
| Reilly, Annie, et Vir O-2-2877 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 14 | 507K | 470K | Jan 1993 – Apr 2026 |
| Lambert, M. F. O-2-2880 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 40 | 504K | 1.58M | Jan 1993 – Apr 2026 |
| Williams, Maude, et al -A- O-2-2878 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 10 | 441K | 369K | Jan 1993 – Jun 2024 |
| Williams, Maude et al "A" O-2-8842 | Hilcorp Energy Company only | Lake Pasture (FT-759) | Refugio | 3 | 255K | 432K | Mar 2004 – Sep 2018 |
| Bauer, Mary Claire et Vir O-2-8808 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 5 | 152K | 230K | Jul 2003 – Jan 2023 |
| Oconnor, Thomas, -A- O-2-2875 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 11 | 107K | 236K | Jan 1993 – Oct 2008 |
| Lambert, M. F. O-2-8638 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 3 | 67.8K | 132K | Mar 2003 – Oct 2010 |
| Williams, Maude et al "B" O-2-7714 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 5 | 40.8K | 109K | Jan 1993 – Mar 2005 |
| Nordan,l. A.-Oconnor,thomas,est. O-2-2869 | T-C Oil Company, LLC only | Tom Oconnor (5900 Sand) | Refugio | 9 | 39.6K | 114K | Jan 1993 – Jun 1998 |
| Roche, K. D. -E- State Oil Unit O-4-3615 | Texas, Les & Co. only | Encino (5900 Sd.) | Refugio | 1 | 38.7K | 20.1K | Jan 1993 – May 2014 |
| Bauer, Mary Claire, et Vir O-2-2871 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 6 | 37.7K | 34.9K | Jan 1993 – Apr 1998 |
| O'Connor, M. E. O-2-5736 | T-C Oil Company, LLC only | Woodsboro, South (5950) | Refugio | 2 | 27.4K | 138K | Jan 1993 – Apr 2017 |
| Welder, J.F. Heirs O-2-6543 | Harvey Brothers Oil & Gas only | Devils Run (5970 Frio) | Refugio | 2 | 22.9K | 24 | Jan 1993 – Jan 1999 |
| Lambert, M. F. O-2-2866 | H & D Operating Company only | Tom Oconnor (5900 Sand) | Refugio | 7 | 17.5K | 30.4K | Jan 1993 – Sep 1994 |
| Heard, Claud E., et Al O-2-2872 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 7 | 17.5K | 59.4K | Jan 1993 – Apr 2007 |
| Hynes O-2-6206 | Magnum Producing, LP only | Papalote, E. (5950) | Refugio | 1 | 15.9K | 14.2K | Jan 1993 – Dec 1996 |
| Oconnor, Thomas, -A- O-2-2864 | T-C Oil Company, LLC only | Tom Oconnor (5900 Sand) | Refugio | 3 | 12.5K | 47.9K | Jan 1993 – Jun 1998 |
| Heard, Ira "B" O-2-8793 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 12K | 129K | May 2003 – Oct 2007 |
| Heard, Ira -A- O-2-2870 | Quintana Pet. Corp. only | Tom Oconnor (5900 Sand) | Refugio | 2 | 7.93K | 37.8K | Jul 1994 – Apr 1998 |
| Shelton O-2-9099 | Hilcorp Energy Company only | Hynes Ranch (5950 Sand) | Refugio | 1 | 5.47K | 6.49K | Nov 2006 – Jul 2011 |
| Oconnor, Thomas, -B- O-2-2865 | Copano Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 4.24K | 26.9K | Jan 1993 – Jun 1995 |
| Nordan & Morris, Oconnor, Thomas O-2-2868 | T-C Oil Company, LLC only | Tom Oconnor (5900 Sand) | Refugio | 3 | 3.1K | 3.98K | Jan 1993 – Aug 2008 |
| Welder Heirs G-2-180674 | C & E Operating, Inc. only | Devils Run (5970 Frio) | Refugio | 1 | 3.06K | 447K | Jul 2000 – Nov 2003 |
| Thomson-Barrow Corp. C G-2-177142 | C & E Operating, Inc. only | Daniel O. Driscoll (Vksbg. 5900) | Refugio | 1 | 2.15K | 304K | Feb 2000 – Sep 2008 |
| Ira Heard "A" O-2-9649 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 1.03K | 739 | May 2011 – Aug 2011 |
| Thomson-Barrow Corp. C G-2-167791 | C & E Operating, Inc. only | Laura Thomson (Vicksburg 5907) | Refugio | 1 | 983 | 785K | Jan 1998 – Mar 2003 |
| Thomson-Barrow Corp. C G-2-187330 | C & E Operating, Inc. only | Laura Thomson (Vicksburg 5907) | Refugio | 1 | 958 | 285K | Aug 2001 – Nov 2009 |
| Claude E. Heard, et Al O-2-11465 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 317 | 62 | Jan 2018 – Feb 2018 |
| M. V. O'Connor Estate G-2-254135 | Kebo Oil & Gas, Inc. only | Lake Pasture, West (5900) | Refugio | 1 | 291 | 125K | Sep 2009 – Feb 2011 |
| Rooke, B. D. O-2-2365 | Laroco LLP only | La Rosa (5900 Sand) | Refugio | 11 | 251 | 1.17K | Apr 1994 – Sep 1994 |
| Thelma Heard G-2-245450 | Kebo Oil & Gas, Inc. only | Lake Pasture, West (5900) | Refugio | 1 | 222 | 119K | Feb 2009 – Mar 2011 |
| Obrien, J. J., -A- O-2-4022 | Chilton Energy only | Greta, Deep (5900) | Refugio | 2 | 85 | 3 | Sep 1993 – Nov 1993 |
| Ira Heard 'A' O-2-9129 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 19 | 5 | Mar 2007 – May 2007 |
| Heard, Ira 5900 Sand Unit O-2-4794 | Quintana Pet. Corp. only | Tom Oconnor (5900 Sand) | Refugio | 2 | 0 | 0 | — |
| Michna, P. M. O-2-2364 | Laroco LLP only | La Rosa (5900 Sand) | Refugio | 3 | 0 | 0 | — |
| Williams, Maude et al "A" G-2-284280 | Hilcorp Energy Company only | Lake Pasture (E-259) | Refugio | 1 | 0 | 322 | Aug 2017 – Aug 2017 |
| Williams, Maude et al "A" G-2-282206 | Hilcorp Energy Company only | Lake Pasture (E-259) | Refugio | 1 | 0 | 20.9K | Mar 2017 – Nov 2018 |
| Roche O-4-13640 | Finaly Resources LLC only | Encino (5900 Sd.) | Refugio | 1 | 0 | 0 | — |
| Arc - Thomson - Barrow Ranch G-2-229659 | Aurora Resources Corporation only | Laura Thomson (Vicksburg 5907) | Refugio | 1 | 0 | 0 | — |
| Thelma Heard G-2-250233 | Kebo Oil & Gas, Inc. only | Lake Pasture, West (5900) | Refugio | 1 | 0 | 18.9K | Feb 2009 – Oct 2009 |
| Heard, F. V. W., -A- O-2-4024 | Josey, Lenoir M., Inc. only | Greta, Deep (5900) | Refugio | 2 | 0 | 0 | — |
| Williams, Maude et al "A" G-2-261172 | Hilcorp Energy Company only | Lake Pasture (E-259) | Refugio | 1 | 0 | 2.27K | Jan 2011 – Jan 2011 |
| Barber O-2-7519 | 2 D Oil & Gas LLC only | Blanco Creek (5970) | Refugio | 3 | 0 | 0 | — |
| Heard, Fannie V. W. G-2-198671 | Cambrian Management, Ltd. only | Greta (5900) | Refugio | 1 | 0 | 605K | Dec 2002 – Nov 2007 |
| Roche, Kathleen D. O-2-7880 | Wallis Energy, Inc. only | Devils Run (5970 Frio) | Refugio | 1 | 0 | 0 | — |
| Lambert, Mary F., -A- O-2-2867 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 0 | 0 | — |
| Heard, Claude E. et Al O-2-12306 | Hilcorp Energy Company only | Tom Oconnor (5900 Sand) | Refugio | 1 | 0 | 0 | — |