| Welder, E. H. -E- G-4-138443 | Marathon Oil Company only | Rooke (8050) | San Patricio | 1 | 153K | 6.34M | by Jan 1993 – Jun 1998 |
| Welder Heirs G-4-142436 | Hurd Enterprises, Ltd. only | Bold Forbes (9550) | Duval | 1 | 117K | 5.21M | by Jan 1993 – Oct 2000 |
| Welder 'C' G-2-234179 | Hilcorp Energy Company only | Sharps Lake, N. (5040) | Refugio | 1 | 113K | 310K | Jan 2008 – May 2015 |
| Welder, J. F. Heirs G-4-220134 | Wagner Oil Company only | Angelita, East (6900) | San Patricio | 1 | 108K | 262K | Nov 2005 – May 2017 |
| Welder Ford G-4-266216 | Dallas Petroleum Group, LLC only | Taft, West (5600) | Refugio | 1 | 85K | 128K | Apr 2012 – May 2017 |
| Knight Ranch G-2-226046 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 69.9K | 2.65M | Feb 2007 – Nov 2021 |
| Walston-Pettus G-2-236915 | Welderxp Ltd. only | Dallas Husky, NE. (Mackhank) | Goliad | 1 | 63.2K | 394K | Jan 2008 – Aug 2026 |
| Vela, Lazaro G-4-134284 | Welderxp Ltd. only | Jaboncillos (Yegua 4-Seg.b) | Duval | 1 | 59.7K | 2.96M | by Jan 1993 – Dec 2015 |
| Welder GU 217 G-4-212263 | Remora Operating, LLC only | Seven Sisters, S. (Massive) | Duval | 1 | 53.6K | 2.92M | Jul 2005 – Feb 2024 |
| Parr Sunray G-4-203720 | Welderxp Ltd. only | Parr Sunray (Yegua Consolidated) | Duval | 1 | 52.5K | 3.04M | May 2004 – Sep 2017 |
| Encina G-2-201724 | Welderxp Ltd. only | Dallas Husky (Wilcox 9000) | Goliad | 1 | 45.3K | 1.85M | Feb 2004 – Apr 2025 |
| Moc-Welder "C" G-4-177713 | Covenant Oil & Gas, L.P. only | Plymouth (6700) | San Patricio | 1 | 43.5K | 1.91M | Jun 2000 – Aug 2006 |
| Welder Heirs G-4-144943 | Hurd Enterprises, Ltd. only | Bold Forbes (9800) | Duval | 1 | 41.9K | 580K | Feb 1993 – Jul 2001 |
| Welder, J.F. Unit G-4-132098 | Iron Jaw Operating LLC only | Odem | San Patricio | 1 | 40.1K | 625K | by Jan 1993 – Apr 2011 |
| Walston-Pettus A G-2-242641 | Welderxp Ltd. only | Dallas Husky, NE. (Massive WX) | Goliad | 1 | 35.4K | 189K | Jul 2008 – Aug 2026 |
| Welder Heirs 212 G-4-149648 | Continental Exploration, L.L.C. only | Dejay, North (Slick) | Duval | 1 | 34.1K | 1.39M | Feb 1994 – Feb 2012 |
| Parr Kibbe G-4-198482 | Welderxp Ltd. only | Parr Sunray (Yegua Consolidated) | Duval | 1 | 32.1K | 1.67M | Nov 2003 – Feb 2025 |
| Welder Heirs G-2-174735 | Dominion Expl. & Prod., Inc. only | Rob Welder (Wilcox 9100) | Victoria | 1 | 30.4K | 1.05M | Aug 1999 – Aug 2003 |
| Welder, R. H. G-2-93323 | Cico Oil & Gas Company only | Rob Welder SW. (8500 Wilcox) | Victoria | 1 | 29.2K | 1.09M | by Jan 1993 – Dec 2001 |
| Hinton G-2-244405 | Welderxp Ltd. only | Oakville (Wilcox Cons.) | Live Oak | 1 | 29K | 1.32M | Nov 2008 – Aug 2026 |
| Welder, J. F. G-4-161056 | Iron Jaw Operating LLC only | Odem (Massive Frio) | San Patricio | 1 | 28.8K | 795K | Nov 1996 – Aug 2025 |
| Young, S.E. et Al G-2-94179 | Welder Exploration & Prod., Inc. only | Cosden (Z-12) | Bee | 1 | 27.2K | 1.75M | by Jan 1993 – Nov 2013 |
| Knight Ranch G-2-221776 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 24.4K | 823K | Aug 2006 – Aug 2026 |
| Knight Ranch G-2-229624 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 22.8K | 956K | Jun 2007 – Feb 2024 |
| Welder G-2-282697 | B&L Exploration, L.L.C. only | Sheriff (9400) | Calhoun | 1 | 21.6K | 617K | Apr 2017 – Dec 2020 |
| Welder Heirs G-4-191515 | Suemaur Expl. & Prod., LLC only | Odem (7500) | San Patricio | 1 | 19.9K | 3.19M | Oct 2002 – Dec 2011 |
| Heirs, Welder G-2-169252 | Dominion Expl. & Prod., Inc. only | Rob Welder (Wilcox 10,400) | Victoria | 1 | 18.6K | 450K | Mar 1998 – Jul 2004 |
| Vela G-4-202179 | Welderxp Ltd. only | Jaboncillos (7200) | Duval | 1 | 18.3K | 1.3M | Mar 2004 – Dec 2015 |
| Cliff Fromme G-2-236080 | Welderxp Ltd. only | Dallas Husky, NE. (Massive WX) | Goliad | 1 | 18.3K | 1.05M | Mar 2008 – Jul 2016 |
| Welder Heirs G-2-232689 | Kebo Oil & Gas, Inc. only | Lake Pasture (FT-690) | Refugio | 1 | 17.5K | 754K | Sep 2007 – Jul 2013 |
| Welder-Terrell G-2-230170 | C & E Operating, Inc. only | Devils Run (Chamberlain 3A) | Refugio | 1 | 17.4K | 917K | May 2007 – Mar 2016 |
| Welder, J. F. Heirs -F- G-4-47222 | Columbus Energy, LLC only | Seven Sisters, East (10000) | Duval | 1 | 16.9K | 3.03M | by Jan 1993 – Mar 2021 |
| Welder-Ford "A" G-4-169645 | Sandalwood Oil & Gas, Inc. only | Plymouth (6500) | San Patricio | 1 | 16.7K | 816K | Aug 1998 – Jun 2002 |
| Welder, M. S. G-4-171793 | Abraxas Petroleum Corporation only | Portilla (9000 Sand) | San Patricio | 1 | 16.6K | 2.14M | Dec 1998 – Jul 2012 |
| Parr Sunray G-4-201257 | Welderxp Ltd. only | Parr Sunray (Yegua Consolidated) | Duval | 1 | 16.5K | 1M | Apr 2004 – Dec 2007 |
| Welder Ranch A G-2-222477 | Proline Energy Resources Inc only | Marshall (Middle Wilcox) | Victoria | 1 | 16.5K | 784K | Oct 2006 – May 2021 |
| Welder Ranch G-4-199173 | Proline Energy Resources Inc only | Angelita New (Frio) | San Patricio | 1 | 16.3K | 626K | Oct 2003 – Jul 2026 |
| Knight Ranch G-2-240762 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 15.9K | 698K | Sep 2008 – Feb 2024 |
| Welder, W. D. G-3-238419 | Milagro Exploration, LLC only | Liberty, South | Liberty | 1 | 15.6K | 683K | Jun 2008 – Nov 2010 |
| Welder, J. F. Heirs G-4-249108 | Iron Jaw Operating LLC only | Odem (Massive Frio) | San Patricio | 1 | 15.5K | 342K | Jul 2008 – Aug 2025 |
| Welder, J. F. Unit G-4-180180 | 84 Energy LLC only | Odem (Massive Frio) | San Patricio | 1 | 14.9K | 448K | Jan 2000 – Jul 2025 |
| Welder Heirs, J.F. G-4-228965 | Iron Jaw Operating LLC only | Odem (6700 Stringer) | San Patricio | 1 | 14.5K | 1.11M | May 2007 – Jul 2025 |
| Welder, J. F. Unit G-4-175349 | Iron Jaw Operating LLC only | Odem (Massive Frio) | San Patricio | 1 | 14K | 216K | Dec 1999 – Jul 2025 |
| Welder, J.F. Unit G-4-175424 | Iron Jaw Operating LLC only | Odem (6700 -B-) | San Patricio | 1 | 13.8K | 565K | Dec 1999 – Aug 2025 |
| Welder Heirs G-2-170630 | C & E Operating, Inc. only | Peponi Ranch (Frio 4800) | Refugio | 1 | 13.1K | 3.34M | Sep 1998 – Jun 2011 |
| Vela, Lazard G-4-199662 | Welderxp Ltd. only | Jaboncillos (Yegua 4-Seg.b) | Duval | 1 | 12.9K | 1.15M | Jan 2004 – Jun 2015 |
| Parr Kibbe Molina G-4-208805 | Welderxp Ltd. only | Parr Sunray (Yegua Consolidated) | Duval | 1 | 12.7K | 711K | Mar 2005 – Oct 2020 |
| Newton-Welder G-2-136639 | Dreyfus, Louis Natural Gas Corp only | Wayno Bueno (Wilcox 2ND Massive) | Goliad | 1 | 12.4K | 793K | by Jan 1993 – Apr 1999 |
| Foster G-2-230267 | Welderxp Ltd. only | Cannan, South (10100 Wilcox) | Bee | 1 | 11.9K | 390K | Aug 2007 – Jan 2015 |
| Welder, J. F. Unit G-4-175450 | Iron Jaw Operating LLC only | Odem (Massive Frio) | San Patricio | 1 | 11.9K | 336K | Dec 1999 – Jun 2025 |