| Haynes, L. G-4-202302 | Merit Energy Company only | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 21K | 2.39M | Jun 2004 – Aug 2026 |
| Martinez, A. Unit G-4-151881 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 20.7K | 2.26M | Aug 1994 – Aug 2026 |
| Cuellar, E. O-4-13657 | RMX Oil & Gas, LLC only | Jennings, W. (3000 Sand) | Zapata | 10 | 20.4K | 0 | Dec 2011 – Jun 2026 |
| Slator Ranch "B" G-4-175528 | Mountain V Texas, LLC only | Zwebb (10350) | Zapata | 1 | 20.4K | 1.84M | Jan 2000 – Aug 2026 |
| Whittier G-4-224786 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 20.4K | 3.89M | Dec 2006 – Aug 2026 |
| BMT-Barrocito G-4-256225 | Mountain V Texas, LLC only | Stirling (Wilcox Consolidated) | Zapata | 1 | 20.3K | 1.3M | Apr 2010 – Aug 2026 |
| Slator Ranch G-4-214137 | Mountain V Texas, LLC only | Stirling (Wilcox Consolidated) | Zapata | 1 | 20.3K | 5.87M | Oct 2005 – Aug 2026 |
| Gutierrez et Al G-4-216354 | Merit Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 20.3K | 2.12M | Dec 2005 – Aug 2026 |
| Serapio Vela E G-4-175506 | Hilcorp Energy Company only | Roleta (C-5) | Zapata | 1 | 20.2K | 7.73M | Oct 1999 – Aug 2026 |
| Juan de Dios G-4-202730 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 20K | 4.02M | Jun 2004 – Aug 2026 |
| BMT-Barrocito G-4-257070 | Mountain V Texas, LLC only | Stirling (Wilcox Consolidated) | Zapata | 1 | 19.6K | 1.69M | Aug 2010 – Aug 2026 |
| McGrath G-4-183853 | Mountain V Texas, LLC only | Zwebb (10350) | Zapata | 1 | 19.5K | 3.61M | Jun 2001 – Aug 2026 |
| Vela, A. G-4-122547 | Proline Energy Resources Inc only | Roleta (Wilcox Consolidated) | Zapata | 1 | 19.4K | 3.08M | by Jan 1993 – May 2021 |
| Galo G-4-230371 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 19K | 2.52M | Jul 2007 – Aug 2026 |
| Las Clavellinas Ranch 36 G-4-165084 | Three C Exploration, LLC only | Zapata, SE. (Wilcox) | Zapata | 1 | 18.9K | 4.91M | Oct 1997 – Jul 2023 |
| Mc Grath G-4-189425 | Mountain V Texas, LLC only | Zwebb (10350) | Zapata | 1 | 18.8K | 3.86M | Jun 2002 – Aug 2026 |
| Vela, Serapio Heirs B G-4-180943 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 18.7K | 4.74M | Jan 2001 – Aug 2026 |
| Slator Ranch G-4-288970 | Mountain V Texas, LLC only | Stirling (Wilcox Consolidated) | Zapata | 1 | 18.3K | 988K | Nov 2019 – Aug 2026 |
| JMV Unit G-4-169600 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 18.2K | 2.48M | Jun 1998 – Aug 2026 |
| Martinez, E.C. G-4-208266 | Hilcorp Energy Company only | La Perla (Lobo Cons.) | Zapata | 1 | 17.8K | 3.04M | Dec 2004 – Aug 2026 |
| McGrath G-4-191101 | Mountain V Texas, LLC only | Zwebb (10350) | Zapata | 1 | 17.8K | 4M | Jul 2002 – Aug 2026 |
| Marshall, S.G. G-4-124742 | Mountain V Texas, LLC only | Pok - a - Dot (8600) | Zapata | 1 | 17.8K | 3.4M | by Jan 1993 – Aug 2026 |
| Vela Estate G-4-162066 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 17.6K | 5.58M | Nov 1996 – Aug 2026 |
| Vela Estate G-4-164382 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 17.6K | 6.72M | Feb 1997 – Aug 2026 |
| U.S.A. Gas Unit 2 G-4-180337 | Beehive Operating, LLC only | Bob West, North (LZ-5) | Zapata | 1 | 17.6K | 3.74M | Dec 2000 – Jul 2015 |
| Alfonso G-4-176407 | Hilcorp Energy Company only | Charco (9200) | Zapata | 1 | 17.5K | 5.18M | Dec 1999 – Aug 2026 |
| Guerra "L" G-4-111421 | Merit Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 17.5K | 4.38M | by Jan 1993 – Jul 2026 |
| Palmyra "B" G-4-160881 | Beehive Operating, LLC only | Bob West, North (L-1,L-2,L-3) | Zapata | 1 | 17.4K | 29.2M | Apr 1996 – Aug 2026 |
| Haynes, L. G-4-197014 | Merit Energy Company only | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 17.3K | 2.14M | Aug 2003 – Mar 2020 |
| Marshall, S. G. G-4-246614 | Mountain V Texas, LLC only | Pok - a - Dot (8600) | Zapata | 1 | 17.3K | 1.58M | Oct 2008 – Aug 2026 |
| Vela, Serapio B G-4-173977 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 17.1K | 1.12M | Jul 1999 – Aug 2026 |
| Ramon "B" G-4-216944 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 17K | 1.93M | Jan 2006 – Aug 2026 |
| Haynes, L. G-4-194408 | Merit Energy Company only | Los Mogotes (Wilcox Cons.) | Zapata | 1 | 17K | 4.58M | Mar 2003 – Aug 2026 |
| Mercurio Martinez et al Unit A G-4-144238 | Hilcorp Energy Company only | La Perla (Lobo Cons.) | Zapata | 1 | 16.8K | 3.53M | by Jan 1993 – Aug 2026 |
| Slator Ranch B G-4-174612 | Mountain V Texas, LLC only | Zwebb (10350) | Zapata | 1 | 16.8K | 2.11M | Sep 1999 – Aug 2026 |
| Thomasma, Ray J. G-4-266397 | Hilcorp Energy Company only | Aviators S. (9450) | Zapata | 1 | 16.8K | 5.9M | Nov 2011 – Apr 2021 |
| Marshall, S.G. G-4-124659 | Mountain V Texas, LLC only | Pok - a - Dot (8600) | Zapata | 1 | 16.6K | 2.23M | by Jan 1993 – Aug 2026 |
| Old Zapata Deep Gas Unit G-4-140947 | Varas Energy Operating Company, only | Urebeno, South (Wilcox 7000) | Zapata | 1 | 16.6K | 3.98M | by Jan 1993 – Aug 2026 |
| Salinas, G. G. G-4-215451 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 16.5K | 1.27M | Nov 2005 – Aug 2026 |
| Garza, L. G-4-185104 | Mountain V Texas, LLC only | Garza (Consolidated) | Zapata | 1 | 16.5K | 1.99M | Sep 2001 – Aug 2026 |
| Vela Estate G-4-165921 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 16.3K | 3.15M | Jul 1997 – Aug 2026 |
| Martinez, M. G-4-129202 | Varas Energy Operating Company, only | Pok - a - Dot (8600) | Zapata | 1 | 16.2K | 1.91M | by Jan 1993 – Aug 2026 |
| Gomez G-4-175131 | Varas Energy Operating Company, only | Taguache Creek (Wilcox 10800) | Zapata | 1 | 16.2K | 1.24M | Oct 1999 – Oct 2023 |
| Hinojosa, G. G. O-4-9789 | STX Operating Company only | Randado Ranch (Queen City) | Zapata | 7 | 16.2K | 3.82K | by Jan 1993 – May 2001 |
| Vela, Antonio G-4-95206 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 16.2K | 3.65M | by Jan 1993 – Aug 2026 |
| Wright-Barrera GU G-4-242247 | Mountain V Texas, LLC only | Pok - a - Dot (8600) | Zapata | 1 | 15.9K | 1.24M | Jun 2008 – Aug 2026 |
| Dominguez G-4-214177 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 15.9K | 1.73M | Oct 2005 – Aug 2026 |
| Hilario, Don "A" G-4-241759 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 15.7K | 6.82M | Aug 2008 – Aug 2026 |
| Guerra L G-4-243248 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 15.7K | 5.98M | May 2008 – Aug 2026 |
| Alfonso G-4-175983 | Hilcorp Energy Company only | Charco (9200) | Zapata | 1 | 15.7K | 3.36M | Nov 1999 – Aug 2026 |