| Vielmann-Ramirez-Marshall G U G-4-149615 | Hilcorp Energy Company only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 45 | 1.18M | May 1994 – Apr 2026 |
| Ika Ramirez (A. Gonzalez, Jr) G-4-238074 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 43 | 30.4K | Jan 2008 – Jul 2013 |
| Ramirez "A" G-4-177035 | Beehive Operating, LLC only | Bob West, North (L-1,L-2,L-3) | Zapata | 1 | 40 | 45.3K | Apr 2000 – Sep 2024 |
| Ramirez, M. R. G-4-165808 | Dominion Expl. & Prod., Inc. only | Lopeno (Wilcox 9850) | Zapata | 1 | 37 | 2.66M | Dec 1997 – Jul 2002 |
| Ramirez, Maria V. G-4-169426 | Beehive Operating, LLC only | Bob West (L-7) | Zapata | 1 | 36 | 22.7K | Jul 1998 – Apr 2002 |
| Ramirez G-4-250199 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 33 | 412K | Apr 2009 – Apr 2026 |
| Ramirez, J. S. G-4-173325 | Hilcorp Energy Company only | Roleta (Wilcox Consolidated) | Zapata | 1 | 31 | 510K | May 1999 – Apr 2026 |
| Ramirez-Yzaguirre Gas Unit G-4-157180 | Beehive Operating, LLC only | Bob West (L-18, 20, 21, 22) | Zapata | 1 | 31 | 352K | Nov 1995 – May 2024 |
| R & R Ramirez F.p.ltd G-4-207016 | Hilcorp Energy Company only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 31 | 214K | Nov 2004 – Apr 2026 |
| Alexander-Ramirez G.U. 1 G-4-132281 | Davis Southern Operating Co LLC only | Laredo (Lobo) | Webb | 1 | 30 | 24.3K | by Jan 1993 – Sep 1999 |
| Ramirez, Federico G-4-127850 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 29 | 8.4M | by Jan 1993 – Apr 2026 |
| Ramirez, L.O. A G-4-253340 | Hilcorp Energy Company only | Roleta (7483) | Zapata | 1 | 29 | 204K | Apr 2008 – Apr 2026 |
| Ramirez-USA GU "E" G-4-243489 | Merit Energy Company only | Bob West (L-18, 20, 21, 22) | Starr | 1 | 28 | 2.49M | Jul 2008 – Apr 2026 |
| Vielmann-Ramirez-Marshall G U G-4-154929 | Hilcorp Energy Company only | Cisco-Benavides (Lobo Cons.) | Zapata | 1 | 28 | 1.71M | Jul 1994 – Apr 2026 |
| Juan Ramirez Gas Unit G-4-216331 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 23 | 652K | Nov 2005 – Apr 2026 |
| Ramirez, Federico G-4-189841 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 21 | 3.57M | Feb 2002 – Apr 2026 |
| Ramirez, Ramiro G-4-172492 | Hilcorp Energy Company only | Haynes (Middle Wilcox Cons.) | Zapata | 1 | 21 | 1.12M | Mar 1999 – Apr 2026 |
| Ramirez, Federico G-4-187365 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 20 | 5.28M | Oct 2001 – Apr 2026 |
| Ramirez, Josefa G-4-163790 | XTO Energy Inc. only | Lopeno (Consolidated) | Zapata | 1 | 16 | 919K | Jul 1997 – Jul 2004 |
| Ramirez Gas Unit G-4-178981 | Merit Energy Company only | Bob West (L-1-4) | Zapata | 1 | 14 | 57K | Sep 2000 – Jul 2008 |
| Ramirez, Abel G-4-224609 | Hilcorp Energy Company only | Exsun (Lobo Cons.) | Zapata | 1 | 14 | 752K | Nov 2006 – Apr 2026 |
| Ramirez, Blas G-4-93342 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 14 | 2.42M | by Jan 1993 – Apr 2026 |
| Ramirez, M. R. G-4-178411 | Dominion Expl. & Prod., Inc. only | Lopeno (Wilcox 9100) | Zapata | 1 | 13 | 16.2K | Aug 2002 – Sep 2002 |
| Ramirez-Yzaguirre Gas Unit G-4-149151 | Beehive Operating, LLC only | Bob West (L-18, 20, 21, 22) | Zapata | 1 | 11 | 1.11M | Mar 1994 – Apr 2026 |
| Ramirez, Josefa G-4-222933 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 11 | 138K | Sep 2006 – Apr 2011 |
| Ramirez-USA GU "E" G-4-141913 | Merit Energy Company only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 10 | 4.41M | by Jan 1993 – Apr 2026 |
| Ramirez-USA GU "E" G-4-154277 | Cantera Operating, LLC only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 10 | 8.24M | Feb 1995 – Feb 2010 |
| Ramirez, Federico G-4-127848 | Parker & Parsley Development L.P only | Lopeno (Wilcox 10,200) | Zapata | 1 | 8 | 663K | by Jan 1993 – Aug 1994 |
| Ramirez-USA GU "E" G-4-204084 | Merit Energy Company only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 7 | 1.94M | Sep 2004 – Apr 2026 |
| Ramirez-USA GU "E" G-4-149037 | Merit Energy Company only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 7 | 9.34M | Feb 1994 – Apr 2026 |
| Ramirez, Federico G-4-136183 | Dominion Expl. & Prod., Inc. only | Lopeno (Wilcox I) | Zapata | 1 | 6 | 1.99M | by Jan 1993 – Nov 2000 |
| Ramirez-USA GU "E" G-4-160894 | Merit Energy Company only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 6 | 3M | May 1996 – Apr 2026 |
| Ramirez-USA GU "E" G-4-150895 | Merit Energy Company only | Bob West (L-18, 20, 21, 22) | Starr | 1 | 5 | 17.4M | May 1994 – Apr 2026 |
| Ramirez, Josefa G-4-30390 | Vantage Operating II, LLC only | Lopeno ( Reklaw B) | Zapata | 1 | 5 | 472K | by Jan 1993 – Apr 2026 |
| Ramirez-USA GU "E" G-4-205567 | Merit Energy Company only | Bob West (L-12, 13, 14, 15) | Starr | 1 | 5 | 1.67M | Nov 2004 – Apr 2026 |
| Ramirez, Josefa G-4-129648 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 4 | 161K | Dec 2002 – Apr 2026 |
| Ramirez M. V. G-4-161154 | Transtexas Gas Corporation only | Bob West, North (12,900) | Zapata | 1 | 4 | 46.6K | May 1996 – Apr 1997 |
| Ramirez-USA GU "E" G-4-164039 | Merit Energy Company only | Bob West (L-18, 20, 21, 22) | Starr | 1 | 4 | 3.43M | Dec 1996 – Apr 2026 |
| Ramirez, Federico G-4-137014 | Dominion Expl. & Prod., Inc. only | Lopeno (11,250 Wilcox) | Zapata | 1 | 3 | 1.86M | by Jan 1993 – Jan 2005 |
| Ramirez, Manuel G-4-129644 | Dominion Expl. & Prod., Inc. only | Lopeno (Wilcox 10,150) | Zapata | 1 | 3 | 892K | by Jan 1993 – Nov 2000 |
| Ramirez-USA GU "E" G-4-153276 | Merit Energy Company only | Bob West (L-18, 20, 21, 22) | Starr | 1 | 3 | 5.14M | Oct 1994 – Jun 2021 |
| Ramirez, Josefa G-4-166019 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 3 | 739K | Dec 1997 – Apr 2026 |
| Ramirez, Federico G-4-182159 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 2 | 3.39M | Feb 2001 – Apr 2026 |
| Ramirez GU 'E' G-4-278482 | Merit Energy Company only | Bob West (L-1-4) | Starr | 1 | 2 | 28.2K | Apr 2015 – Apr 2026 |
| Ramirez, Blas G-4-169213 | Dominion Expl. & Prod., Inc. only | Bob West, North (L-1,L-2,L-3) | Zapata | 1 | 2 | 100K | Jul 1998 – Apr 2005 |
| Ramirez, M. R. G-4-247396 | Vantage Operating II, LLC only | Lopeno (Consolidated) | Zapata | 1 | 1 | 65.5K | Dec 2008 – Mar 2020 |
| Vielmann-Ramirez G-4-181991 | Calpine Natural Gas L.P. only | Urebeno, South (Wilcox 7000) | Zapata | 1 | 1 | 65K | Jan 2001 – Sep 2003 |
| Ramirez, Manuel Ramos G-4-11543 | XTO Energy Inc. only | Lopeno (Consolidated) | Zapata | 1 | 1 | 200 | Jun 1994 – Mar 2008 |
| Leonardo G-4-179883 | Hilcorp Energy Company only | Ramirez (Lobo) | Zapata | 1 | 1 | 28.5K | Aug 2000 – Sep 2000 |
| Ramirez-USA GU "E" G-4-161075 | Merit Energy Company only | Bob West (L-18, 20, 21, 22) | Starr | 1 | 1 | 2M | Jul 1996 – Apr 2026 |