| Killam Mineral Fee "601" G-4-148849 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 37.7K | 1.88M | Mar 1994 – Jul 2008 |
| Catto Heirs Unit #2 G-4-143155 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 36.5K | 2.46M | by Jan 1993 – Dec 2022 |
| K & H Fee "2042" G-4-107363 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 27.1K | 893K | by Jan 1993 – Mar 2000 |
| Killam Mineral Fee "601" G-4-152575 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 21.5K | 3.45M | Dec 1994 – Aug 2026 |
| K&H Fee "574" G-4-160856 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 20.2K | 2.53M | Nov 1996 – Jan 2016 |
| Frost National Bank G-4-138439 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 16.3K | 2.7M | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-123572 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 16.1K | 3.01M | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-125282 | Conocophillips Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 14.2K | 1.1M | by Jan 1993 – Sep 2002 |
| K & H Fee "1620" G-4-145435 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 13.5K | 1.86M | Apr 1993 – Dec 2019 |
| Frost National Bank G-4-139395 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 13.4K | 1.94M | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-143981 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 12.4K | 2.76M | by Jan 1993 – Jan 2012 |
| K & H Fee "2042" G-4-149325 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 9.35K | 225K | Mar 1994 – Mar 1996 |
| Catto Heirs Unit #2 G-4-142653 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 9.27K | 607K | by Jan 1993 – Jul 2001 |
| Frost National Bank G-4-141566 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 7.69K | 1.48M | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-140930 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 6.95K | 1.91M | by Jan 1993 – Aug 2026 |
| Killam Mineral Fee "601" G-4-115080 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 6.79K | 966K | by Jan 1993 – Jan 2016 |
| Derby G-4-168697 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 6.09K | 631K | May 1998 – Aug 2026 |
| Killam Mineral Fee "601" G-4-156245 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 5.79K | 77.6K | Oct 1995 – Mar 1997 |
| Frost National Bank G-4-140077 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 5.44K | 1.37M | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-124550 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 4.81K | 796K | by Jan 1993 – Aug 2026 |
| Bruni Mineral 'C' G-4-277572 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 4.77K | 492K | Jul 2015 – Aug 2026 |
| Frost National Bank G-4-135335 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 4.48K | 686K | by Jan 1993 – Aug 2026 |
| Frost National Bank G-4-136270 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 4.44K | 1.05M | by Jan 1993 – Jul 2025 |
| Frost National Bank G-4-128578 | Conocophillips Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 4.05K | 141K | by Jan 1993 – Dec 2001 |
| Frost National Bank G-4-113874 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 3.71K | 1.16M | by Jan 1993 – Aug 2026 |
| Catto Heirs Unit #2 G-4-120159 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 3.68K | 254K | by Jan 1993 – Oct 2002 |
| Frost National Bank G-4-135817 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 3.64K | 1.06M | by Jan 1993 – Sep 2025 |
| K&H Fee "1619" G-4-225923 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 3.34K | 802K | May 2006 – Aug 2026 |
| Frost National Bank G-4-142634 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 2.74K | 654K | by Jan 1993 – Dec 2010 |
| Catto Heirs Unit #2 G-4-120316 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 2.73K | 210K | by Jan 1993 – Jan 1997 |
| Catto Heirs Unit #1 G-4-114514 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 2.68K | 283K | by Jan 1993 – Dec 2007 |
| Frost National Bank G-4-128195 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 2.51K | 318K | by Jan 1993 – Jun 1995 |
| Killam & Hurd Fee "D" 1248 G-4-213648 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 2.23K | 731K | Aug 2005 – Aug 2026 |
| K&H Fee "2042" G-4-130100 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 1.69K | 546K | by Jan 1993 – Mar 2000 |
| Frost National Bank G-4-110475 | Conocophillips Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 1.41K | 210K | by Jan 1993 – Feb 2000 |
| K&H "1570" G-4-131312 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 1.35K | 441K | by Jan 1993 – Feb 2016 |
| K & H Fee 'D' G.U. 1 G-4-281193 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 1.34K | 280K | Aug 2016 – Aug 2026 |
| Frost National Bank G-4-123059 | Conocophillips Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 821 | 82.5K | by Jan 1993 – Nov 1995 |
| Killam-Hurd Fee 1612 G-4-214268 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 451 | 60.1K | Sep 2005 – Jul 2008 |
| Frost National Bank G-4-122140 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 409 | 372K | by Jan 1993 – Jun 1998 |
| K & H Fee '2042' G-4-290905 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 245 | 56.4K | Dec 2020 – Aug 2026 |
| Frost National Bank G-4-156329 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 51 | 758K | Nov 1995 – Aug 2026 |
| B.M.T. G-4-171949 | | Villegas (Middle Wilcox 7950) | Webb | 1 | 29 | 230K | Nov 1998 – Jun 2008 |
| Villarreal-Leyendecker Gas Unit G-4-290765 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 31.3K | May 2021 – Jun 2025 |
| Bruni Mineral Trust 'A' G-4-287678 | Hilcorp Energy Company only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 0 | — |
| K&H Fee "574" G-4-270169 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 18.8K | Mar 2013 – Jan 2016 |
| Killam & Hurd "1690" G-4-125125 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 0 | — |
| Ramon, Emma "a" Gas Unit G-4-124588 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 0 | — |
| K & H Fee "1620" G-4-121660 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 0 | — |
| K & H Fee "1620" G-4-113160 | Killam Oil Co., Ltd. only | Villegas (Middle Wilcox 7950) | Webb | 1 | 0 | 10.6K | by Jan 1993 – Apr 1993 |