| 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 – Aug 2026 |
| McClaugherty, L. S. G-1-144632 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 36.2K | 1.65M | Feb 1993 – Aug 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 – Aug 2026 |
| Bracken et Al G-1-156708 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 33.6K | 850K | Dec 1995 – Aug 2026 |
| Southwest Texas Corp. D G-4-228238 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Starr | 1 | 33.5K | 1.43M | Jul 2007 – Aug 2026 |
| Anthony Forest Products G-1-257947 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 33.5K | 2.54M | Jul 2010 – Aug 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 | 117K | Jun 1997 – Aug 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 | 31.7K | 200K | Nov 2008 – Aug 2026 |
| Gruy, Dagmar G-4-245001 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 31.5K | 1.27M | Jan 2009 – Aug 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 | 6.73M | by Jan 1993 – Aug 2026 |
| Gutierrez Heirs G-4-113810 | Varas Energy Operating Company, | Urebeno, South (Wilcox 7000) | Zapata | 1 | 29.1K | 6.63M | by Jan 1993 – Aug 2026 |
| Bracken et Al G-1-110831 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 28.4K | 687K | by Jan 1993 – Nov 2013 |
| Whitfield-Martin GU G-1-198809 | Varas Energy Operating Company, | Spaulding (Wilcox Slick) | McMullen | 1 | 28.4K | 2.57M | May 2003 – Jul 2026 |
| ZR Unit "A" G-1-166046 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 28.4K | 318K | Dec 1997 – Aug 2026 |
| Gruy, Dagmar G-4-253002 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 28.2K | 2.16M | Oct 2009 – Aug 2026 |
| Deatrick G-4-193373 | Varas Energy Operating Company, | Jeffress, E. (10,400 SD) | Hidalgo | 1 | 28.1K | 3.21M | Dec 2002 – Jul 2026 |
| Bracken et Al G-1-106497 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 27.9K | 852K | by Jan 1993 – Aug 2026 |
| Gruy, Dagmar G-4-229012 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 27.5K | 3.07M | Jun 2007 – Aug 2026 |
| Moglia G-4-254895 | Varas Energy Operating Company, | Tiffany (Wilcox Carrizo) | Webb | 1 | 27.2K | 1.67M | Feb 2010 – Aug 2026 |
| SBR G-1-156014 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 27.1K | 318K | Oct 1995 – Aug 2022 |
| Hal Lopeno O-4-14070 | Varas Energy Operating Company, | Lopeno ( Queen City Oil) | Zapata | 3 | 27.1K | 49.3K | Jan 2018 – Jun 2026 |
| SWR "B" G-1-162599 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 26.9K | 104K | Mar 1997 – Apr 2026 |
| Villarreal G-4-177369 | Varas Energy Operating Company, | Pok - a - Dot (8600) | Webb | 1 | 26.9K | 2.58M | May 2000 – Apr 2025 |
| Bracken et Al G-1-151707 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 26.7K | 679K | Jun 1994 – Aug 2026 |
| SBR G-1-163571 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 26.3K | 104K | Jun 1997 – Aug 2026 |
| Gruy, Dagmar G-4-224738 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 24.5K | 1.67M | Dec 2006 – Aug 2026 |
| SWR G-1-161145 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 24.3K | 528K | Nov 1996 – Aug 2026 |
| Norvehc G-4-228977 | Varas Energy Operating Company, | Tiffany (Wilcox Carrizo) | Webb | 1 | 23.9K | 1.81M | Apr 2007 – Aug 2026 |
| Hostetter, A. M. G-1-146657 | Varas Energy Operating Company, | Hostetter (Wilcox A) | McMullen | 1 | 23.9K | 1.27M | Jul 1993 – Mar 2003 |
| L. S. McClaugherty GU G-1-178529 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23.8K | 546K | Oct 1999 – Aug 2026 |
| SWR "B" G-1-160164 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23.6K | 1.04M | Aug 1996 – Apr 2026 |
| SBR G-1-243835 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23.4K | 414K | Oct 2008 – Apr 2026 |
| Bracken et Al G-1-181932 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23.2K | 426K | Mar 2001 – Aug 2026 |
| Gruy, Dagmar G-4-224748 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 23.2K | 1.74M | Jan 2007 – Aug 2026 |
| Bracken et Al G-1-126360 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23.1K | 746K | by Jan 1993 – Aug 2026 |
| WR "K" G-1-162046 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 23K | 430K | Feb 1997 – Aug 2026 |
| Gruy, Dagmar G-4-222674 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 22.5K | 2.32M | Oct 2006 – Jul 2026 |
| Gruy, Dagmar G-4-227774 | Varas Energy Operating Company, | Lopez, SE. (Consolidated) | Duval | 1 | 22.3K | 1.12M | May 2007 – Aug 2026 |
| SBR G-1-163574 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 22.3K | 480K | Jun 1997 – Aug 2026 |
| McClaugherty, L. S. G-1-144631 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 22.1K | 897K | Feb 1993 – Aug 2026 |
| F. T. G-1-157480 | Varas Energy Operating Company, | A.W.P. (Olmos) | McMullen | 1 | 21.9K | 1.02M | Mar 1996 – Aug 2026 |
| Cooper Foundation G-4-215177 | Varas Energy Operating Company, | T Patch (Reklaw Oso) | Jim Hogg | 1 | 21.9K | 2.12M | Dec 2005 – Aug 2026 |
| Martin, S J G-4-166087 | Varas Energy Operating Company, | Cerrito Creek (Lobo Cons.) | Webb | 1 | 21.8K | 3.97M | Nov 1997 – Dec 2024 |