| Guerra, Raul O-4-10703 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 3 | 206K | 485K | Jan 1993 – Apr 2026 |
| Ramirez, Blas O-4-7946 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 1 | 78.4K | 158K | Jan 1993 – May 2020 |
| Hal Lopeno O-4-14070 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 3 | 26.8K | 48.9K | Jan 2018 – Apr 2026 |
| Vela-Lopeno Minerals Ltd G-4-193147 | Vantage Operating II, LLC only | Lopeno ( Reklaw B) | Zapata | 1 | 11.3K | 3.88M | Aug 2002 – Apr 2026 |
| Ramirez, Josefa, Etal O-4-6061 | Varas Energy Operating Company, only | Lopeno ( Queen City Oil) | Zapata | 2 | 10.1K | 29.7K | Jan 1993 – Nov 2009 |
| Palmyra Minerals, Ltd. G-4-163325 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 5.03K | 1.95M | Feb 1997 – Apr 2026 |
| Alexander G-4-225320 | Hilcorp Energy Company only | Lopeno ( Reklaw B) | Zapata | 1 | 4.73K | 1.21M | Dec 2006 – Jun 2016 |
| Benavides Mineral Trust G-4-147856 | EOG Resources, Inc. only | Lopeno, NE. (7350) | Zapata | 1 | 4.66K | 898K | Dec 1993 – Jan 1999 |
| Palmyra G-4-170339 | Mag Exploration LLC only | Lopeno (Consolidated) | Zapata | 1 | 3.85K | 1.35M | Aug 1998 – May 2015 |
| Benavides, Juan G. G-4-97386 | Elliott Oil & Gas Operating Co. only | Lopeno, SW (Wilcox 7380) | Zapata | 1 | 3.02K | 670K | Jan 1993 – Dec 2008 |
| Ramirez G-4-222125 | Hilcorp Energy Company only | Lopeno ( Reklaw B) | Zapata | 1 | 2.32K | 1.32M | Aug 2006 – Oct 2018 |
| Esperanza G-4-181315 | Beehive Operating, LLC only | Lopeno (Consolidated) | Zapata | 1 | 2.08K | 1.06M | Jan 2001 – Aug 2024 |
| Ramirez G-4-218456 | Hilcorp Energy Company only | Lopeno ( Reklaw B) | Zapata | 1 | 1.85K | 1.38M | Apr 2006 – Jun 2016 |
| Palmyra Minerals, Ltd. G-4-161956 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 1.74K | 1.78M | Nov 1996 – Apr 2026 |
| Palmyra Minerals Ltd G-4-164387 | EOG Resources, Inc. only | Lopeno (Consolidated) | Zapata | 1 | 1.73K | 565K | Aug 1997 – Sep 2011 |
| Dominion Palmyra G-4-200775 | XTO Energy Inc. only | Lopeno ( Reklaw B) | Zapata | 1 | 1.69K | 582K | Mar 2004 – Jan 2014 |
| Baltazar Ramos G-4-220127 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 1.64K | 554K | Apr 2006 – Apr 2026 |
| Palmyra G-4-169408 | EOG Resources, Inc. only | Lopeno (Consolidated) | Zapata | 1 | 1.18K | 878K | Jul 1998 – Sep 2011 |
| Palmyra G-4-215074 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 873 | 1.27M | Sep 2005 – Apr 2026 |
| Gonzales Benavides Trust G-4-213678 | Chesapeake Operating, L.L.C. only | Lopeno, NE (Wilcox Lower) | Zapata | 1 | 829 | 1.43M | Sep 2005 – Aug 2013 |
| El Milagro "B" G-4-233795 | Three C Exploration, LLC only | Lopeno (Consolidated) | Zapata | 1 | 807 | 1.18M | Jan 2008 – Feb 2016 |
| Fernando Munoz G-4-131216 | Dominion Expl. & Prod., Inc. only | Lopeno (Wilcox 8825) | Zapata | 1 | 704 | 3.27M | Jan 1993 – Jun 2000 |
| Palmyra G-4-215456 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 660 | 1.08M | Nov 2005 – Apr 2026 |
| Ramirez, Jose Est. E G-4-199820 | Vantage Operating II, LLC only | Lopeno ( Reklaw B) | Zapata | 1 | 647 | 611K | Dec 2003 – Sep 2024 |
| Ramirez, Jose Est. E G-4-196865 | Vantage Operating II, LLC only | Lopeno ( Reklaw B) | Zapata | 1 | 608 | 424K | Sep 2003 – Sep 2024 |
| El Milagro "B" Bajo (Shallow) G-4-244176 | Three C Exploration, LLC only | Lopeno ( Reklaw B) | Zapata | 1 | 588 | 875K | Aug 2008 – Feb 2016 |
| Worley Gas Unit G-4-226729 | Ricochet Energy, Inc. only | Lopeno (Consolidated) | Zapata | 1 | 520 | 3.75M | Apr 2007 – Apr 2010 |
| Esperanza G-4-179848 | Beehive Operating, LLC only | Lopeno (Consolidated) | Zapata | 1 | 408 | 579K | Nov 2000 – Aug 2024 |
| Benavides Mineral Trust G-4-141286 | Enron Oil & Gas Company only | Lopeno, NE (Wilcox Lower) | Zapata | 1 | 389 | 731K | Jan 1993 – Feb 1996 |
| Benavides Mineral Trust G-4-221640 | GGP Exploration, Ltd. only | Lopeno, NE (A-3) | Zapata | 1 | 314 | 102K | Nov 2006 – Jul 2009 |
| Guerra, Raul G-4-179323 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 271 | 6.94M | May 2000 – Apr 2026 |
| Benavides Mineral Trust G-4-150079 | EOG Resources, Inc. only | Lopeno, NE (A-3) | Zapata | 1 | 267 | 1.03M | May 1994 – Apr 1999 |
| Ramirez, Josefa G-4-180399 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 251 | 1.74M | Sep 2000 – Dec 2025 |
| Palmyra Minerals, Ltd. G-4-155715 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 247 | 3.42M | Sep 1995 – Apr 2026 |
| Ramirez, M. R. G-4-179529 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 233 | 2.89M | Jul 2000 – May 2024 |
| Ramirez, M. R. G-4-190602 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 217 | 2.08M | Oct 2001 – Apr 2007 |
| El Milagro "B" G-4-232961 | Three C Exploration, LLC only | Lopeno (Consolidated) | Zapata | 1 | 215 | 1.32M | Nov 2007 – Feb 2016 |
| Benavides Mineral Trust G-4-147855 | EOG Resources, Inc. only | Lopeno, NE. (9400) | Zapata | 1 | 211 | 1.75M | Dec 1993 – Jun 1996 |
| McDermott Heirs G-4-147764 | Tri-C Resources, Inc. only | Hal Lopeno (Wilcox B-7) | Zapata | 1 | 210 | 120K | Nov 1993 – Oct 1996 |
| Vela, J. G-4-246911 | Bustamante Oil Company only | Lopeno (Consolidated) | Zapata | 1 | 206 | 133K | Jul 2008 – Apr 2012 |
| Guerra, Raul G-4-212790 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 199 | 1.48M | May 2005 – Apr 2026 |
| Ramos, Felix G-4-198103 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 193 | 551K | Sep 2003 – Apr 2014 |
| Guerra, Raul G-4-186513 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 192 | 3.2M | Sep 2001 – Apr 2026 |
| Guerra, Raul G-4-249617 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 191 | 246K | Dec 2008 – Apr 2026 |
| Palmyra Minerals, Ltd. G-4-156168 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 173 | 5.52M | Aug 1995 – Apr 2026 |
| Palmyra Minerals, Ltd. G-4-170947 | Acock/Anaqua Operating Co., LP only | Lopeno (Consolidated) | Zapata | 1 | 173 | 60.6K | Feb 1998 – Aug 2007 |
| Palmyra Minerals, Ltd. G-4-159830 | Varas Energy Operating Company, only | Lopeno (Consolidated) | Zapata | 1 | 171 | 2.57M | Aug 1996 – Mar 2006 |
| El Milagro "B" G-4-233632 | Three C Exploration, LLC only | Lopeno (Consolidated) | Zapata | 1 | 170 | 721K | Nov 2007 – Dec 2010 |
| El Milagro "B" G-4-235282 | Three C Exploration, LLC only | Lopeno (Consolidated) | Zapata | 1 | 161 | 851K | Jan 2008 – Jul 2011 |
| Guerra, Raul G-4-177815 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 157 | 4.64M | Jun 2000 – Apr 2026 |