| Amarilla, Rosa G-4-169717 | Varas Energy Operating Company, | Santa Ana (Marks) | Hidalgo | 1 | 944K | 17.6M | Jul 1998 – Apr 2026 |
| Santa Ana G-4-169296 | Varas Energy Operating Company, | Santa Ana (Marks) | Hidalgo | 1 | 582K | 9.97M | Jun 1998 – Apr 2026 |
| Eia Properties G-4-215176 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 163K | 8.54M | Jan 2006 – Apr 2026 |
| Garcia 1 G-4-143177 | Varas Energy Operating Company, | Alta Mesa, East (7760 Vicksburg) | Brooks | 1 | 158K | 10.3M | Jan 1993 – Mar 2026 |
| Southwest Texas Corp "A" G-4-208309 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 148K | 8.22M | Dec 2004 – Apr 2026 |
| Cooper Foundation G-4-212176 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Jim Hogg | 1 | 88.6K | 3.21M | Aug 2005 – Apr 2026 |
| Southwest Texas Corp "C" G-4-208781 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 85.6K | 4.64M | Mar 2005 – Apr 2026 |
| Anthony Forest Products G-1-263066 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 76.9K | 1.02M | Mar 2011 – Apr 2026 |
| Villarreal G-4-181118 | Varas Energy Operating Company, | Pok - a - Dot (8600) | Webb | 1 | 72.6K | 3.14M | Jan 2001 – Apr 2025 |
| Cooper Foundation G-4-209900 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 71.1K | 4.24M | Jun 2005 – Apr 2026 |
| Sullivan, D. J. -B- G-4-254899 | Varas Energy Operating Company, | Pita (Frio Consolidated) | Brooks | 1 | 61.5K | 633K | Jan 2009 – Feb 2026 |
| Anthony Forest Products G-1-266725 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 58.9K | 1.04M | Apr 2012 – Apr 2026 |
| Anthony Forest Products G-1-255265 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 58.1K | 1.84M | Jan 2010 – Apr 2026 |
| Laurel, A. G-4-164674 | Varas Energy Operating Company, | Cuba Libre (3RD Hinnant) | Webb | 1 | 56.8K | 2.87M | Aug 1997 – Feb 2026 |
| Self Gas Unit G-1-167875 | Varas Energy Operating Company, | Hostetter (Wilcox A) | Duval | 1 | 56.1K | 3M | Mar 1998 – Mar 2026 |
| Whitehurst G-1-271047 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 55.4K | 1.53M | Apr 2013 – Apr 2026 |
| Bracken et Al G-1-157247 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 54.1K | 784K | Dec 1995 – Apr 2026 |
| A. G. Long Gas Unit G-4-166564 | Varas Energy Operating Company, | Cuba Libre (3RD Hinnant) | Webb | 1 | 53.8K | 3.17M | Feb 1998 – Apr 2026 |
| Bracken G-1-133674 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 52.7K | 1.29M | Jan 1993 – Apr 2026 |
| Southwest Texas Corp "B" G-4-208311 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 50.1K | 3.33M | Jan 2005 – Jun 2023 |
| Southwest Texas Corp "D" G-4-209457 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 46.8K | 2.77M | Apr 2005 – Apr 2026 |
| Anthony Forest Products G-1-267253 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 45.4K | 721K | Jun 2012 – Apr 2026 |
| Deatrick G-4-191420 | Varas Energy Operating Company, | Jeffress, E. (10,400 SD) | Hidalgo | 1 | 44.7K | 4.95M | Aug 2002 – Apr 2026 |
| Sullivan, D. J. "B" G-4-160645 | Varas Energy Operating Company, | Pita (Frio Consolidated) | Brooks | 1 | 44.6K | 476K | Sep 1996 – Feb 2026 |
| Gutierrez Heirs 37 G-4-164759 | Varas Energy Operating Company, | Urebeno, South (Wilcox 7000) | Zapata | 1 | 43.8K | 9.21M | Sep 1997 – Nov 2025 |
| Anthony Forest Products G-1-264203 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 42.7K | 1.52M | Sep 2011 – Apr 2026 |
| Bracken et Al G-1-149486 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 42.2K | 1.41M | May 1994 – Apr 2026 |
| Villarreal G-4-179280 | Varas Energy Operating Company, | Pok - a - Dot (8600) | Webb | 1 | 41.2K | 2.05M | Sep 2000 – Apr 2025 |
| Eia Properties G-4-213818 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 40.8K | 2.49M | Sep 2005 – Apr 2026 |
| Bracken et Al G-1-144062 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 40.7K | 1.48M | Jan 1993 – Apr 2026 |
| Whitehurst G-1-260166 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 40.6K | 978K | Dec 2010 – Apr 2026 |
| Villarreal G-4-179707 | Varas Energy Operating Company, | Pok - a - Dot (8600) | Webb | 1 | 39.7K | 2.84M | Aug 2000 – Apr 2025 |
| Whitfield-Martin GU G-1-198806 | Varas Energy Operating Company, | Spaulding (Wilcox Slick) | McMullen | 1 | 39.4K | 3.53M | Oct 2003 – Mar 2026 |
| Atchison Estate G-4-237076 | Varas Energy Operating Company, | West Tiger (Wilcox Cons.) | Duval | 1 | 37.8K | 3.33M | Nov 2007 – Aug 2023 |
| SBR G-1-163661 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 37.5K | 118K | Jun 1997 – Apr 2026 |
| McClaugherty, L. S. G-1-144632 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 36.2K | 1.64M | Feb 1993 – Apr 2026 |
| Atchison Estate G-4-237445 | Varas Energy Operating Company, | West Tiger (Wilcox Cons.) | Duval | 1 | 35.9K | 2.06M | Apr 2008 – Aug 2023 |
| Southwest Texas Corp "F" G-4-212821 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 34.1K | 1.69M | Aug 2005 – Oct 2023 |
| SBR G-1-156089 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 33.8K | 422K | Oct 1995 – Apr 2026 |
| Bracken et Al G-1-156708 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 33.6K | 849K | Dec 1995 – Apr 2026 |
| Southwest Texas Corp. D G-4-228238 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 33.5K | 1.43M | Jul 2007 – Apr 2026 |
| Anthony Forest Products G-1-257947 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 33.5K | 2.53M | Jul 2010 – Apr 2026 |
| Rosario Cattle Co. G-4-168454 | Varas Energy Operating Company, | Cuba Libre (3RD Hinnant) | Webb | 1 | 32.9K | 2.82M | May 1998 – Jul 2024 |
| SBR G-1-164101 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 32.8K | 116K | Jun 1997 – Apr 2026 |
| Penn, Stella G-1-154937 | Varas Energy Operating Company, | Hostetter (Wilcox 10300) | McMullen | 1 | 32.6K | 6.21M | May 1995 – Jun 2001 |
| SBR G-1-247481 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 31.6K | 200K | Nov 2008 – Apr 2026 |
| Gruy, Dagmar G-4-245001 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 31.5K | 1.27M | Jan 2009 – Apr 2026 |
| Flores, Daniel 762 G-4-167446 | Varas Energy Operating Company, | Schwarz (Flores) | Webb | 1 | 30.4K | 3.53M | Apr 1998 – Feb 2026 |
| Spice Gas Unit G-1-130821 | Varas Energy Operating Company, | Hostetter (Wilcox 10300) | McMullen | 1 | 29.1K | 6.72M | Jan 1993 – Apr 2026 |
| Gutierrez Heirs G-4-113810 | Varas Energy Operating Company, | Urebeno, South (Wilcox 7000) | Zapata | 1 | 29.1K | 6.63M | Jan 1993 – Apr 2026 |