| Spahnman Unit O-1-16212 | EOG Resources, Inc. only | First Shot (Austin Chalk) | Gonzales | 1 | 35K | 21.2K | May 2011 – May 2015 |
| Holub O-1-13253 | Cei Operating LLC only | First Shot (Austin Chalk) | Gonzales | 1 | 33K | 41.5K | by Jan 1993 – Oct 2007 |
| Kosarek O-1-14141 | Blackbrush O & G, Inc. only | First Shot (Austin Chalk) | Gonzales | 1 | 31.8K | 16.8K | Jan 1998 – Apr 2006 |
| Thoms O-1-13637 | First Rock, Inc. only | McClain (Buda) | Wilson | 3 | 30K | 10K | by Jan 1993 – Sep 2000 |
| Chapman O-4-13089 | Carter Exploration Company only | Chapman Ranch (First Het) | Nueces | 2 | 29.7K | 3.13K | Apr 2002 – Oct 2006 |
| Trappe -A- O-1-10112 | First Light Operating, LLC only | Marcelina Creek (Austin Chalk) | Wilson | 2 | 28.6K | 8.19K | Feb 2006 – Oct 2011 |
| Robinson-Troell O-1-13349 | Marathon Oil EF LLC only | First Shot (Austin Chalk) | Gonzales | 1 | 28.5K | 23.7K | by Jan 1993 – Aug 2013 |
| First National Co. -B- O-13-4376 | Ross, Dwight M. Drlg. Co., Inc. only | Bowers | Montague | 1 | 27.1K | 35 | by Jan 1993 – Aug 2026 |
| Pawelek O-1-14785 | First Light Operating, LLC only | Marcelina Creek (Austin Chalk) | Wilson | 1 | 27K | 7.97K | Jul 2006 – Jul 2026 |
| Kirby /#117 Hardin/ O-3-7652 | Neches Transport Inc. only | Fisher (Wilcox First) | Tyler | 1 | 26.5K | 43.7K | by Jan 1993 – Aug 2026 |
| Troell, et Al O-1-13202 | Marathon Oil EF LLC only | First Shot (Austin Chalk) | Gonzales | 1 | 25.5K | 2.73K | by Jan 1993 – Aug 2012 |
| First National Bank -A- O-13-16134 | Ross, Dwight M. Drlg. Co., Inc. only | Bowers (Granite Wash) | Montague | 6 | 24.3K | 0 | Jan 1996 – Aug 2026 |
| Orive, A. O-4-12417 | Starco Exploration, Inc. only | Frost (First Noel) | Starr | 1 | 23.6K | 17.5K | Dec 1994 – May 1998 |
| Reinhard Unit O-1-13684 | First Rock, Inc. only | Marcelina Creek (Buda) | Wilson | 2 | 23.5K | 5.17K | Feb 1993 – Sep 2000 |
| Demmer, H. C. O-1-13063 | Genesis Well Service only | First Shot (Austin Chalk) | Karnes | 1 | 23.5K | 7 | Feb 1994 – Nov 1995 |
| First National Bank #1 O-10-4700 | Teke Production LLC only | Pecos Valley (High Gravity) | Pecos | 3 | 23.2K | 146 | by Jan 1993 – Oct 2024 |
| Griffin O-1-13618 | FW Eagle Ford I, LLC only | First Shot (Austin Chalk) | Karnes | 1 | 22.9K | 12 | by Jan 1993 – Jan 2025 |
| Weber Unit O-1-14254 | Modern Exploration, Inc. only | First Shot (Austin Chalk) | Karnes | 1 | 21.9K | 326 | Mar 1999 – Sep 2006 |
| Bevly O-4-13702 | Wallis Energy, Inc. only | Plymouth (Magnolia First) | San Patricio | 1 | 21.3K | 28.4K | Apr 2012 – Jun 2026 |
| First Bywaters O-13-32707 | Waggoner Operating, L.L.C. only | Wichita County (Special) | Wichita | 4 | 20.3K | 22.3K | Oct 2013 – Aug 2026 |
| Culpepper Unit O-1-13335 | Wilson, Billy R. only | First Shot (Austin Chalk) | Gonzales | 1 | 20.2K | 39.2K | by Jan 1993 – Apr 2003 |
| Schaefer-Manford Unit O-1-12982 | Burlington Resources Oil&gas Co. only | First Shot (Austin Chalk) | Gonzales | 1 | 19.5K | 11 | Feb 1993 – Feb 1994 |
| Schoenfeld O-1-12961 | Leede Oil & Gas Inc. only | First Shot (Austin Chalk) | Karnes | 1 | 19.1K | 33K | by Jan 1993 – Jun 1997 |
| Culpepper Oil Unit O-1-13142 | Wilson, Billy R. only | First Shot (Austin Chalk) | Gonzales | 1 | 18.4K | 11.7K | by Jan 1993 – Feb 2009 |
| El Cid "B" O-1-5393 | First Rock, Inc. only | Pearsall (Austin Chalk) | Dimmit | 2 | 18.3K | 15.1K | by Jan 1993 – Feb 2000 |
| Pawelek Unit O-1-14197 | First Light Operating, LLC only | Marcelina Creek (Austin Chalk) | Wilson | 1 | 18.2K | 6.4K | Mar 1998 – Nov 2009 |
| Turnham #1 O-1-13067 | First Rock, Inc. only | Pearsall (Austin Chalk) | Frio | 2 | 17.5K | 5.76K | by Jan 1993 – May 1996 |
| Boyd O-11-16001 | First Permian, L.L.C. only | Brahaney | Yoakum | 4 | 17.4K | 46.2K | by Jan 1993 – Mar 1999 |
| Frank, Jimmy O-1-14253 | First Rock, Inc. only | Marcelina Creek (Buda) | Wilson | 1 | 17.2K | 6.27K | Apr 1999 – Mar 2001 |
| Billings-Gerhart Unit O-1-13255 | Endeavor Energy Resources L.P. only | First Shot (Austin Chalk) | Gonzales | 1 | 17K | 21.6K | by Jan 1993 – Jul 1996 |
| Schiffers Ranch O-1-12316 | First Rock, Inc. only | Marcelina Creek (Buda) | Wilson | 6 | 16.9K | 3.99K | by Jan 1993 – Nov 1999 |
| York O-1-12811 | Chesapeake Operating, Inc. only | First Shot (Austin Chalk) | Gonzales | 1 | 16.8K | 34.8K | by Jan 1993 – Feb 1999 |
| First Natl. Bank of San Angelo O-9-3083 | Phoenix Hydrocarbons Operating only | Benedum (Spraberry) | Upton | 1 | 16.8K | 15.6K | by Jan 1993 – Jan 2004 |
| First National Bank of Snyder O-11-67023 | Trek Resources, Inc. only | Sharon Ridge (Clear Fork) | Scurry | 2 | 16.6K | 46 | Apr 1993 – Jan 2016 |
| Nehemiah O-1-12092 | First Rock, Inc. only | Marcelina Creek (Buda) | Wilson | 1 | 16.2K | 108 | by Jan 1993 – Jan 2001 |
| First National Bank O-3-22479 | Sue-Ann Production Company only | Midfields, (Frio 8925) | Matagorda | 1 | 16K | 176K | Aug 1994 – Jun 1996 |
| Batey O-1-13199 | Chesapeake Operating, Inc. only | First Shot (Austin Chalk) | Karnes | 1 | 15.4K | 7.1K | by Jan 1993 – Sep 1994 |
| Jarzombek Unit O-1-7098 | First Rock, Inc. only | Poth, East (Austin Chalk) | Wilson | 1 | 15.1K | 1.93K | by Jan 1993 – Mar 2010 |
| Chippewa-Ward-Billings O-1-13361 | Wilson, Billy R. only | First Shot (Austin Chalk) | Gonzales | 1 | 14.8K | 27.3K | by Jan 1993 – Oct 2004 |
| Maseles, et Al O-1-13133 | Hughes, Dan A. Company, L.P. only | First Shot (Austin Chalk) | Wilson | 1 | 14.6K | 1.03K | by Jan 1993 – May 2010 |
| First Vict. Natl. Bank O-2-9362 | Pintail Oil & Gas, LLC only | Keeran (7100, S.) | Victoria | 1 | 14.4K | 9.54K | Aug 2008 – May 2012 |
| Schiffers, Moberley O-1-14172 | First Rock, Inc. only | Sutil (Austin) | Wilson | 1 | 14.2K | 0 | Sep 1997 – Jul 2001 |
| George Unit 4 O-1-14255 | Modern Exploration, Inc. only | First Shot (Austin Chalk) | Karnes | 1 | 14K | 1.32K | Jul 1998 – Apr 2002 |
| Ward-Billings -A- O-1-13132 | Wilson, Billy R. only | First Shot (Austin Chalk) | Gonzales | 1 | 13.4K | 12.3K | by Jan 1993 – Jun 1997 |
| BBX Thunderbird Unit #1 O-1-14433 | BBX Operating, L.L.C. only | First Shot (Austin Chalk) | Karnes | 1 | 13.2K | 10.1K | Oct 2002 – Jul 2003 |
| Fee "A" O-1-13218 | First Rock, Inc. only | Marcelina Creek (Austin Chalk) | Wilson | 1 | 13.1K | 3.8K | by Jan 1993 – Feb 1997 |
| First Natl. BK of Bay Cty,tx. O-4-2068 | MHM Pipeline Co., Inc. only | Peters, East | Duval | 1 | 12.4K | 21 | by Jan 1993 – May 2019 |
| Truksa O-3-23743 | Elliott Oil & Gas Operating Co. only | Chocolate Bayou (Frio, First) | Brazoria | 1 | 12.4K | 4.46K | Apr 1999 – Jan 2025 |
| Ferdinand O-1-18061 | Warwick-Artemis, LLC only | First Shot (Austin Chalk) | Wilson | 1 | 12.1K | 38.1K | May 2014 – Oct 2020 |
| Eschenburg, R.L. II O-1-12600 | First Rock, Inc. only | Marcelina Creek (Austin Chalk) | Wilson | 2 | 12K | 148 | May 1997 – Mar 2001 |