| Alexander, Maureen G-4-246600 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 14.1K | 4.97M | Aug 2008 – Mar 2026 |
| Alexander "A" G-4-244496 | Magnum Producing, LP only | Exsun (Lobo Cons.) | Zapata | 1 | 7.43K | 3.63M | Jan 2009 – Jul 2026 |
| Martinez-Alexander Gas Unit G-4-145683 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 6.89K | 5.21M | Apr 1993 – Aug 2026 |
| Alexander G-4-225320 | Hilcorp Energy Company only | Lopeno ( Reklaw B) | Zapata | 1 | 4.73K | 1.21M | Dec 2006 – Jun 2016 |
| Alexander, Charles G-4-145832 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 4.44K | 6.78M | Jun 1993 – Aug 2026 |
| Rathmell-Alexander Gas Unit G-4-160318 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 3.16K | 5.49M | May 1996 – Aug 2026 |
| Alexander-Mandel G-4-251896 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 2.61K | 2.85M | Aug 2009 – Aug 2026 |
| Alexander G-4-171762 | EOG Resources, Inc. only | Alejandrenas (7400) | Zapata | 1 | 2.36K | 1.18M | Jul 1998 – Jun 2005 |
| Alexander, Maureen G-4-204131 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 2.32K | 613K | Aug 2004 – Dec 2025 |
| Alexander-Mandel G-4-257039 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 1.85K | 1.85M | Apr 2010 – Aug 2026 |
| Vela-Alexander Gas Unit G-4-154846 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 1.74K | 4.98M | Jun 1995 – Aug 2026 |
| Alexander, M. Trust G-4-163971 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 1.64K | 3.69M | Mar 1997 – Aug 2026 |
| Alexander G-4-169028 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 1.26K | 862K | Apr 1998 – Jun 2020 |
| Charles, Alexander G-4-289709 | Hilcorp Energy Company only | La Perla (Wilcox 6800) | Zapata | 1 | 1.1K | 877K | May 2016 – Aug 2026 |
| Alexander G-4-218270 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 872 | 1.41M | Nov 2005 – Aug 2026 |
| Alexander, Charles G-4-157816 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 728 | 1.47M | Feb 1996 – May 2016 |
| Alexander-Saenz Gas Unit G-4-239656 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 710 | 816K | Jun 2008 – Aug 2026 |
| Alexander G-4-117567 | Ineos USA Oil & Gas LLC only | Roleta (Wilcox Consolidated) | Zapata | 1 | 685 | 300K | by Jan 1993 – Dec 2008 |
| Alexander "A" G-4-227379 | Hilcorp Energy Company only | Zapata, SE. (Wilcox) | Zapata | 1 | 678 | 3.44M | Apr 2007 – Aug 2026 |
| Alexander, M. G-4-165826 | Ineos USA Oil & Gas LLC only | Roleta (Wilcox Consolidated) | Zapata | 1 | 650 | 575K | Feb 1997 – Aug 2009 |
| Alexander G-4-223501 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 592 | 935K | Nov 2006 – Aug 2026 |
| Lanier-Rathmell-Alexander G U G-4-160320 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 578 | 927K | Jul 1996 – Aug 2026 |
| Alexander, M. M. G-4-142777 | Hilcorp Energy Company only | Roleta (7483) | Zapata | 1 | 566 | 422K | by Jan 1993 – Aug 2026 |
| Alexander, M. M. G-4-167824 | Chesapeake Operating, Inc. only | Roleta (Wilcox Consolidated) | Zapata | 1 | 524 | 66.1K | Oct 1997 – Jul 2006 |
| Alexander G-4-115699 | Chesapeake Operating, Inc. only | Roleta (7483) | Zapata | 1 | 484 | 560K | by Jan 1993 – Mar 2009 |
| Alexander, Maureen G-4-248937 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 424 | 58.4K | May 2009 – Mar 2012 |
| Alexander, Maureen G-4-226876 | Smith Production Inc. only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 414 | 901K | Apr 2007 – Jul 2017 |
| Alexander G-4-224750 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 407 | 649K | Dec 2006 – Aug 2026 |
| Alexander "A" G-4-248176 | Magnum Producing, LP only | Exsun (Lobo Cons.) | Zapata | 1 | 395 | 1.06M | Mar 2009 – Jul 2026 |
| Alexander "A" G-4-205611 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 340 | 76.7K | Sep 2004 – Feb 2012 |
| Alexander, Charles G-4-146355 | Hilcorp Energy Company only | Bashara-Hereford (7300) | Zapata | 1 | 324 | 248K | Jul 1993 – Aug 2026 |
| Alexander, M. M. G-4-157995 | Atlas Operating LLC only | Roleta (Deep Wilcox) | Zapata | 1 | 321 | 4.12M | Sep 1995 – Aug 2026 |
| Martinez-Alexander Gas Unit G-4-71961 | Hilcorp Energy Company only | Laredo (Lobo) | Zapata | 1 | 208 | 857K | May 1997 – Aug 2026 |
| Alexander, Maureen G-4-206472 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 190 | 1.19M | Nov 2004 – Apr 2015 |
| Alexander, Maureen G-4-204634 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 171 | 1.13M | Aug 2004 – Aug 2026 |
| Alexander G-4-127631 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 169 | 437K | by Jan 1993 – Aug 2026 |
| Alexander-Mandel G-4-241727 | Ricochet Energy, Inc. only | Roleta (Wilcox Consolidated) | Zapata | 1 | 86 | 66.4K | Aug 2008 – Nov 2012 |
| Martinez-Alexander Gas Unit "A" G-4-214167 | Hilcorp Energy Company only | Bashara-Hereford | Zapata | 1 | 63 | 504K | Sep 2005 – Aug 2026 |
| Alexander "A" G-4-230050 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 61 | 888K | Jul 2007 – Oct 2011 |
| Alexander, Maureen G-4-210609 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 41 | 683K | Nov 2004 – Aug 2026 |
| Alexander, M.M. NCT "B" G-4-131143 | Ricochet Energy, Inc. only | Urebeno, South (Wilcox 7200) | Zapata | 1 | 37 | 433K | by Jan 1993 – Nov 2006 |
| Alexander, Maureen G-4-204417 | Mountain V Texas, LLC only | Urebeno, South (Lobo Cons.) | Zapata | 1 | 32 | 1.44M | Sep 2004 – Aug 2026 |
| Alexander, Charles G-4-88269 | Chevron U. S. A. Inc. only | Laredo (Lobo) | Zapata | 1 | 26 | 15.4K | by Jan 1993 – Jul 1993 |
| Alexander G-4-218272 | Hilcorp Energy Company only | Roleta (Deep Wilcox) | Zapata | 1 | 23 | 25 | Sep 2014 – Oct 2014 |
| Alexander G-4-199067 | Hilcorp Energy Company only | Tigre Grande (12000) | Zapata | 1 | 17 | 2.3M | Sep 2003 – Aug 2026 |
| Alexander, Maureen G-4-282902 | Mountain V Texas, LLC only | Urebeno, South (Wilcox 5900) | Zapata | 1 | 15 | 14.5K | Oct 2017 – Aug 2026 |
| Alexander et Al G-4-126302 | EOG Resources, Inc. only | Tigre Grande (12000) | Zapata | 1 | 13 | 975K | by Jan 1993 – Oct 1999 |
| Alexander "A" G-4-255119 | Magnum Producing, LP only | Exsun (Lobo Cons.) | Zapata | 1 | 0 | 315K | Apr 2010 – Jul 2026 |
| Alexander-Saenz Gas Unit G-4-242875 | Hilcorp Energy Company only | Roleta (Deep Wilcox) | Zapata | 1 | 0 | 0 | — |
| Alexander G-4-146454 | Ineos USA Oil & Gas LLC only | Roleta (7483) | Zapata | 1 | 0 | 21.9K | Aug 1993 – Oct 1995 |