| Welder, Minnie S. O-4-12594 | Allegiant Resources, LLC only | Portilla (Frio) | San Patricio | 110 | 2.66M | 5.72M | Sep 1996 – Jul 2026 |
| Nueces Bay State Tract 707 O-4-12655 | Orx Resources, L.L.C. only | Mondo Sueno (Brigham) | San Patricio | 2 | 1.05M | 561K | Jan 1997 – Jul 2026 |
| Welder, E. H., -C- O-4-2126 | McGowan Working Partners, Inc. only | Plymouth | San Patricio | 51 | 763K | 1.16M | Jan 1993 – Jul 2026 |
| Welder, Minnie S. O-4-2178 | Abraxas Petroleum Corporation only | Portilla (7400 Sand) | San Patricio | 43 | 686K | 1.65M | Jan 1993 – Nov 1996 |
| Welder, J.F. Unit O-4-12145 | 84 Energy LLC only | Odem (Massive Frio) | San Patricio | 30 | 616K | 7.33M | Jan 1993 – Jul 2026 |
| Maryland Trust O-4-13353 | Kaler Energy Corp. only | McCampbell (Deep Frio Cons.) | San Patricio | 5 | 404K | 319K | Oct 2004 – Jul 2026 |
| Mayo, J. W., a/C 1 O-4-7253 | Hec Petroleum, Inc. only | Taft (4000) | San Patricio | 45 | 395K | 439K | Jan 1993 – Jun 2005 |
| Welder, Minnie S. O-4-8083 | Allegiant Resources, LLC only | Portilla (5700 Sand) | San Patricio | 9 | 299K | 261K | Jan 1993 – Jul 2026 |
| Dimmick O-4-8568 | Anderson Oil Ltd. only | Plymouth (5100) | San Patricio | 2 | 275K | 92.9K | Jan 1993 – Jul 2026 |
| Hutto O-4-12579 | Durango Resources Corp. only | Midway | San Patricio | 5 | 270K | 5.97K | Jun 1996 – Jul 2026 |
| Usher O-4-8948 | Mayfield Energy, LLC only | Aransas Pass | San Patricio | 2 | 211K | 1.31K | Jan 1993 – Jul 2026 |
| Baines, W. M. O-4-10357 | Proline Energy Resources Inc only | Midway, S. (Dubose) | San Patricio | 3 | 191K | 1.87M | Jan 1993 – Jul 2026 |
| Maryland Trust O-4-13179 | Kaler Energy Corp. only | McCampbell (Q Sand) | San Patricio | 1 | 174K | 193K | Aug 2003 – Feb 2007 |
| Welder "A" O-4-12512 | Dallas Petroleum Group, LLC only | Sinton, North (5020 Maduro) | San Patricio | 2 | 168K | 89.5K | Nov 1995 – Jul 2026 |
| Hunt, J. M. O-4-2130 | Wallis Energy, Inc. only | Plymouth | San Patricio | 12 | 163K | 4.86K | Jan 1993 – Jul 2026 |
| Welder, R. H. O-4-2146 | Smith Production Inc. only | Plymouth (Greta Stringer) | San Patricio | 16 | 155K | 323K | Jan 1993 – Jul 2007 |
| Hamon-Harvey O-4-12696 | Magnum Producing, LP only | Harvey (M-3) | San Patricio | 1 | 145K | 31.8K | Aug 1997 – Jul 2026 |
| Welder, J.F. Unit O-4-12144 | 84 Energy LLC only | Odem, S. (Massive Frio) | San Patricio | 5 | 142K | 678K | Feb 1993 – Jul 2026 |
| Welder, Minnie S. O-4-2177 | Abraxas Petroleum Corporation only | Portilla (7300 Sand) | San Patricio | 14 | 139K | 467K | Jan 1993 – Dec 1996 |
| Welder, R. H. -a- a/C 1 O-4-7311 | Dallas Petroleum Group, LLC only | Sinton, North (4600) | San Patricio | 2 | 130K | 131K | Jan 1993 – Jul 2026 |
| Welder, R.H. -B- O-4-11591 | Dallas Petroleum Group, LLC only | North Pasture (7300 Sand) | San Patricio | 1 | 123K | 273K | Jan 1993 – Jul 2026 |
| Harvey O-4-13205 | Forza Operating, LLC only | Harvey (14-B-1) | San Patricio | 1 | 120K | 235K | Jan 2004 – Jul 2026 |
| Welder J O-4-12802 | Dallas Petroleum Group, LLC only | Sinton, North (5600) | San Patricio | 1 | 117K | 103K | Sep 1998 – Jul 2026 |
| Wright O-4-11346 | Tema Oil and Gas Company only | Conn Brown Harbor (Frio "D") | San Patricio | 1 | 106K | 511K | Jan 1993 – Jul 2026 |
| State Tract 975 O-4-13867 | Mego Resources, LLC only | White Point, E. (Scooter Sand) | San Patricio | 1 | 103K | 339K | May 2014 – Jul 2026 |
| George O-4-13241 | Sun Exploration, Inc. only | Het (2700) | San Patricio | 2 | 102K | 27.8K | May 2004 – Jul 2026 |
| Matula 1R O-4-13471 | Dove Creek Energy, Inc. only | Gaines (7700) | San Patricio | 1 | 97.1K | 585K | Mar 2008 – Jul 2026 |
| Welder, Minnie S. O-4-2176 | Abraxas Petroleum Corporation only | Portilla (7100 Sand) | San Patricio | 10 | 92.1K | 156K | Jan 1993 – Nov 1996 |
| Ellis, R. R. O-4-1987 | Wagner Oil Company only | Odem | San Patricio | 2 | 89.6K | 245K | Jan 1993 – Sep 2015 |
| Dimmick, A. J. O-4-11961 | Synergy Oil & Gas, Inc. (A) only | Plymouth (6200 Sand) | San Patricio | 1 | 83.4K | 146K | Jan 1993 – Aug 1999 |
| State Tract 683 O-4-9905 | Southcoast Production Inc only | Nueces Bay, W. (4600) | Nueces | 3 | 82.7K | 113K | Jan 1993 – Jul 2026 |
| Sims-Drees Unit No. 1 O-4-13627 | Sandalwood Exploration, L.P. only | Taft, Deep (a-2 Sand) | San Patricio | 1 | 82.3K | 78.9K | Jul 2010 – Jul 2023 |
| Pappy Revival Unit No. 1 O-4-14141 | Sandalwood Exploration, L.P. only | Papalote, South (Catahoula) | San Patricio | 1 | 81.6K | 0 | Sep 2019 – Jul 2026 |
| Welder, J.F. Heirs O-4-12778 | Proline Energy Resources Inc only | Angelita New (Frio) | San Patricio | 2 | 79.4K | 907K | Mar 1998 – Jul 2026 |
| Frost, R. A. O-4-10159 | CLR Secondary Recovery, LLC only | Taft, South (8500) | San Patricio | 1 | 79.4K | 112K | Jan 1993 – Jul 2026 |
| Miller, C.A. O-4-10325 | Zone Ridge Operating, LLC only | HI-Luk | San Patricio | 1 | 77K | 42.6K | Jan 1993 – Jul 2026 |
| Sims-Drees Unit No. 1 O-4-13602 | Sandalwood Exploration, L.P. only | Taft, Deep (C-2 SD, 6000) | San Patricio | 1 | 77K | 113K | Feb 2010 – Jul 2023 |
| Jostes O-4-13151 | Sun Exploration, Inc. only | Mathis, North (2780) | San Patricio | 2 | 76.5K | 2.3K | Apr 2003 – Jul 2026 |
| Welder, R. H. O-4-8746 | Smith Production Inc. only | Plymouth (4400) | San Patricio | 1 | 72.6K | 112K | Jan 1993 – Jun 2005 |
| Mayo O-4-14090 | Angel Operating LLC only | Taft (4000) | San Patricio | 1 | 71.4K | 32.3K | Jun 2018 – Jul 2026 |
| State Tract 683 O-4-9661 | Southcoast Production Inc only | Nueces Bay, W. (4850) | San Patricio | 1 | 70.8K | 94.7K | Jan 1993 – Jul 2026 |
| Brown, C. S. O-4-7832 | Sun Exploration, Inc. only | Charlie Brown (Koehler, 2ND) | San Patricio | 3 | 70.1K | 20.4K | Jan 1993 – Jul 2026 |
| Welder, R.H. "B" O-4-13735 | Dallas Petroleum Group, LLC only | Sinton, North (4700 Sand) | San Patricio | 1 | 69K | 40.5K | Mar 2012 – Jul 2026 |
| Welder, Minnie S. O-4-11271 | Abraxas Petroleum Corporation only | Portilla (8000 Sand) | San Patricio | 2 | 65.9K | 141K | Jan 1993 – Dec 1996 |
| Chiltipin State Tract #3 O-4-2128 | Green Exploration Company only | Plymouth | San Patricio | 5 | 64.6K | 5.55K | Jan 1993 – Jul 2026 |
| Mayo, J. W. a/C 1 O-4-8976 | Hec Petroleum, Inc. only | Taft (4550) | San Patricio | 5 | 63.7K | 73.9K | Jan 1993 – May 2005 |
| Oelschlegel, Frank Jr. et Al O-4-10289 | Hughes, Dan A. Company, L.P. only | Taft, South (8500) | San Patricio | 1 | 63.6K | 150K | Jan 1993 – Feb 2008 |
| Jostes O-4-10852 | Mortimer Production Company only | Het (3114 Sand) | San Patricio | 2 | 63.2K | 59 | Jan 1993 – Oct 2014 |
| Welder, E.H. -C- O-4-12523 | McGowan Working Partners, Inc. only | Plymouth (6000 -B- Sand) | San Patricio | 1 | 63.2K | 129K | Jan 1996 – Jul 2026 |
| Floerke O-4-9181 | AC Exploration, LLC only | Midway | San Patricio | 2 | 62.7K | 5.96K | Jan 1993 – Nov 2008 |