| Welder, Minnie S. O-4-12594 | Goldking Minerals Mgmt, L.L.C. | Portilla (Frio) | 110 | 2.66M | 5.75M | Sep 1996 – Aug 2026 |
| Nueces Bay State Tract 707 O-4-12655 | Orx Resources, L.L.C. | Mondo Sueno (Brigham) | 2 | 1.05M | 561K | Jan 1997 – Jul 2025 |
| Welder, E. H., -C- O-4-2126 | McGowan Working Partners, Inc. | Plymouth | 51 | 773K | 1.17M | by Jan 1993 – Aug 2026 |
| Bell Valley G-4-198117 | EOG Resources, Inc. | Midway, South (Consolidated) | 1 | 694K | 11.7M | Nov 2003 – Aug 2010 |
| Welder, Minnie S. O-4-2178 | Abraxas Petroleum Corporation | Portilla (7400 Sand) | 43 | 686K | 1.65M | by Jan 1993 – Aug 1996 |
| Welder, J.F. Unit O-4-12145 | Iron Jaw Operating LLC | Odem (Massive Frio) | 30 | 616K | 7.33M | Feb 1993 – Aug 2025 |
| Valley G-4-197376 | Harris Energy Services, LLC | Midway, South (Consolidated) | 1 | 544K | 7.37M | Sep 2003 – Jun 2022 |
| McKamey G-4-233342 | Midstar Energy Corporation | Midway, South (Consolidated) | 1 | 538K | 2.59M | Nov 2007 – Aug 2026 |
| Nueces Bay State Tract 688 G-4-242306 | Orx Resources, L.L.C. | Nueces Bay Deep Consolidated | 1 | 427K | 13.2M | Aug 2008 – Aug 2026 |
| Maryland Trust O-4-13353 | Kaler Energy Corp. | McCampbell (Deep Frio Cons.) | 5 | 405K | 319K | Oct 2004 – Aug 2026 |
| Mayo, J. W., a/C 1 O-4-7253 | Hec Petroleum, Inc. | Taft (4000) | 45 | 395K | 439K | by Jan 1993 – Aug 2004 |
| Welder, Minnie S. O-4-8083 | Goldking Minerals Mgmt, L.L.C. | Portilla (5700 Sand) | 9 | 299K | 262K | by Jan 1993 – Aug 2026 |
| Dimmick O-4-8568 | Anderson Oil Ltd. | Plymouth (5100) | 2 | 278K | 92.9K | by Jan 1993 – Aug 2026 |
| Hutto O-4-12579 | Durango Resources Corp. | Midway | 5 | 270K | 5.97K | Jun 1996 – Jun 2026 |
| Elick G-4-270167 | Orx Resources, L.L.C. | Midway, East (Frio Cons.) | 1 | 267K | 8.03M | Apr 2013 – Aug 2026 |
| Cable Gas Unit G-4-175268 | Bopco, L.P. | Portland, N. (Commonwealth Serie | 1 | 248K | 3.2M | Oct 1999 – Jun 2008 |
| Valley G-4-206475 | Proline Energy Resources Inc | Midway, South (Consolidated) | 1 | 243K | 4.69M | Nov 2004 – Aug 2026 |
| Welder, E. H., -C- O-4-6772 | McGowan Working Partners, Inc. | Plymouth (5470) | 2 | 217K | 396K | by Jan 1993 – Nov 2022 |
| Usher O-4-8948 | Mayfield Energy, LLC | Aransas Pass | 2 | 215K | 1.31K | by Jan 1993 – Jul 2026 |
| State Tract 692 et al Unit G-4-251663 | Orx Resources, L.L.C. | Nueces Bay Deep Consolidated | 1 | 211K | 5.16M | Jul 2009 – Aug 2026 |
| Portland Gas Unit "D" G-4-233979 | Sulphur River Exploration, Inc. | Portland, N. (Commonwealth Serie | 1 | 205K | 3.42M | Mar 2008 – Aug 2026 |
| Apex GU G-4-199536 | Proline Energy Resources Inc | Midway, South (Consolidated) | 1 | 195K | 5.01M | Nov 2003 – Aug 2026 |
| Baines, W. M. O-4-10357 | Proline Energy Resources Inc | Midway, S. (Dubose) | 3 | 191K | 1.87M | by Jan 1993 – Mar 2025 |
| State Tract 690/746&750 GU G-4-248014 | Orx Resources, L.L.C. | Nueces Bay Deep Consolidated | 1 | 188K | 5.27M | Nov 2008 – Aug 2026 |
| State Tract 690 746 & 750 GU G-4-241023 | Energy Twenty Operating LLC | Nueces Bay Deep Consolidated | 1 | 181K | 4.85M | Jun 2008 – Sep 2012 |
| Maryland Trust O-4-13179 | Kaler Energy Corp. | McCampbell (Q Sand) | 1 | 174K | 193K | Aug 2003 – Jun 2006 |
| State Tract 690/746 & 750 GU G-4-261952 | Orx Resources, L.L.C. | Nueces Bay Deep Consolidated | 1 | 171K | 2.46M | Jul 2011 – Feb 2024 |
| Jones, Fred B. Unit G-4-194464 | Orx Resources, L.L.C. | White Point, East (Consolidated) | 1 | 170K | 3.28M | Mar 2003 – Jul 2020 |
| State Tract 976 G-4-226860 | Orx Resources, L.L.C. | White Point, East (Consolidated) | 1 | 169K | 1.98M | Mar 2007 – Aug 2026 |
| Welder "A" O-4-12512 | Dallas Petroleum Group, LLC | Sinton, North (5020 Maduro) | 2 | 168K | 89.5K | Nov 1995 – Aug 2026 |
| Valley G-4-200931 | Proline Energy Resources Inc | Midway, South (Consolidated) | 1 | 165K | 1.36M | Mar 2004 – Dec 2025 |
| State Tract 689 G-4-244688 | Energy Twenty Operating LLC | Nueces Bay Deep Consolidated | 1 | 165K | 1.66M | Oct 2008 – Oct 2019 |
| Kirk GU G-4-222304 | Southcoast Production Inc | White Point, East (Consolidated) | 1 | 165K | 4M | Jun 2006 – Dec 2012 |
| Hunt, J. M. O-4-2130 | Wallis Energy, Inc. | Plymouth | 12 | 164K | 4.86K | by Jan 1993 – Jun 2026 |
| London G-4-62307 | Royal Production Company, Inc. | Portland, N. (Commonwealth Serie | 1 | 163K | 4.63M | by Jan 1993 – May 2008 |
| Crites A G-4-212182 | Proline Energy Resources Inc | Midway, South (Consolidated) | 1 | 158K | 3.48M | Jun 2005 – Dec 2025 |
| Welder, R. H. O-4-2146 | Smith Production Inc. | Plymouth (Greta Stringer) | 16 | 155K | 323K | by Jan 1993 – Dec 2005 |
| Welder, E. H. -E- G-4-138443 | Marathon Oil Company | Rooke (8050) | 1 | 153K | 6.34M | by Jan 1993 – Jun 1998 |
| State Tract 973 O-4-3287 | Green Exploration Company | White Point, East | 4 | 152K | 86.5K | by Jan 1993 – Sep 2017 |
| Hamon-Harvey O-4-12696 | Magnum Producing, LP | Harvey (M-3) | 1 | 145K | 31.8K | Aug 1997 – Nov 2018 |
| Welder, J.F. Unit O-4-12144 | Iron Jaw Operating LLC | Odem, S. (Massive Frio) | 5 | 142K | 678K | Feb 1993 – Sep 2016 |
| Welder, Minnie S. O-4-2177 | Abraxas Petroleum Corporation | Portilla (7300 Sand) | 14 | 139K | 467K | by Jan 1993 – Aug 1996 |
| BP America GU G-4-225390 | Orx Resources, L.L.C. | White Point, East (Consolidated) | 1 | 131K | 2.64M | Nov 2006 – Aug 2026 |
| Brooks GU G-4-204193 | Southcoast Production Inc | White Point, East (Consolidated) | 1 | 130K | 3.2M | Jul 2004 – Jun 2019 |
| Welder, R. H. -a- a/C 1 O-4-7311 | Dallas Petroleum Group, LLC | Sinton, North (4600) | 2 | 130K | 131K | Apr 1994 – Jul 2006 |
| Smith L G-4-205634 | Proline Energy Resources Inc | Midway, South (Consolidated) | 1 | 129K | 3.39M | Oct 2004 – Jun 2026 |
| Kirk Gas Unit G-4-94731 | Dallas Petroleum Group, LLC | White Point, East (Consolidated) | 1 | 128K | 4.38M | by Jan 1993 – Aug 2026 |
| Cable-Garrett G-4-193950 | Royal Production Company, Inc. | Portland, N. (Commonwealth Serie | 1 | 127K | 2.1M | Mar 2003 – Jan 2019 |
| Moore, W. H. G-4-165983 | Esenjay Exploration, Inc | Harvey, Deep (Anderson South) | 1 | 125K | 4.22M | Nov 1997 – Aug 1999 |
| Welder, R.H. -B- O-4-11591 | Dallas Petroleum Group, LLC | North Pasture (7300 Sand) | 1 | 123K | 273K | by Jan 1993 – May 2021 |