| Slaughter Estate Unit O-11-18105 | Occidental Permian EOR, LLC only | Slaughter | Hockley | 412 | 50.3M | 202M | Jan 1993 – Apr 2026 |
| XBC Giddings Estate O-9-16349 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 420 | 43.6M | 150M | May 2007 – Apr 2026 |
| Montgomery Estate-Davies NCT-2 O-11-14567 | Bce-Mach III LLC only | Levelland | Hockley | 198 | 11M | 3.54M | Jan 1993 – Apr 2026 |
| Stumberg Estate O-1-16109 | Murphy Expl. & Prod. Co. - USA only | Briscoe Ranch (Eagleford) | Dimmit | 37 | 6.66M | 17M | Oct 2012 – Apr 2026 |
| Burnett, S. B. Estate O-11-66571 | Hunt Oil Company only | Anne Tandy (Strawn 5400) | King | 106 | 5.6M | 343K | Jan 1993 – Sep 2012 |
| Davis, J. H. P. Estate O-3-4625 | P.o.&g. Operating, LLC only | Thompson, SE. (Frio) | Fort Bend | 18 | 5.06M | 3.05M | Jan 1993 – Apr 2026 |
| Pierce Estates O-3-6715 | Remora Management, LLC only | Magnet Withers | Wharton | 146 | 4.66M | 4.21M | Jan 1993 – Apr 2026 |
| Texaco Slaughter Estate O-11-67566 | Bce-Mach III LLC only | Tstar (Abo) | Hockley | 25 | 3.46M | 958K | Apr 1996 – Apr 2026 |
| Slaughter, A. A. Estate O-11-61632 | Burk Royalty Co., Ltd. only | Leeper (Glorieta) | Hockley | 131 | 3.44M | 1.23M | Jan 1993 – Apr 2026 |
| Post Estate "A" O-11-1898 | Brown, Geo. R Partnership,lp,the only | Garza | Garza | 69 | 3.25M | 333K | Jan 1993 – Apr 2026 |
| Post Estate O-11-1873 | Brown, Geo. R Partnership,lp,the only | Garza | Garza | 83 | 3.16M | 621K | Jan 1993 – Apr 2026 |
| Burnett, S. B. Estate "D" O-11-60638 | High River Res Operating, LLC only | Captain Burk (Strawn Reef) | King | 33 | 2.74M | 172K | Jan 1993 – Apr 2026 |
| Cowden Estate et Al O-10-33183 | Scout Energy Management LLC only | Dollarhide, East (Devonian) | Andrews | 17 | 2.4M | 2.89M | Jan 1993 – Apr 2026 |
| Eaton, G. W. Estate O-6-1079 | Peles, LLC only | Neches (Woodbine) | Anderson | 47 | 2.03M | 1.78M | Jan 1993 – Apr 2026 |
| Slick, T.B. Estate A-229 O-4-12809 | Hilcorp Energy Company only | Rincon (Vicksburg 89A) | Starr | 2 | 2.02M | 2.29M | Jan 1998 – Jun 2023 |
| XBC Giddings Estate R40 O-9-18718 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) R 40 Exc | Upton | 8 | 1.9M | 5.19M | Jun 2014 – Apr 2026 |
| Powell, Kenneth L. Estate O-14-5946 | High River Res Operating, LLC only | Lathem (Canyon Granite Wash) | Hartley | 3 | 1.87M | 22 | Jan 1993 – Apr 2026 |
| Giddings Estate Fee O-9-11402 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 88 | 1.75M | 5.17M | Jan 1993 – Apr 2005 |
| XBC Giddings Estate C O-9-16483 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 20 | 1.6M | 3.49M | Nov 2007 – Apr 2026 |
| Burnett, S. B. Estate "D" O-11-66562 | Citation Oil & Gas Corp. only | Big RRR (South, Conglomerate) | King | 6 | 1.44M | 1.11M | Jan 1993 – Apr 2026 |
| Masterson Estate O-14-2324 | Beren Corporation only | Panhandle (Red Cave) | Moore | 77 | 1.43M | 1.6M | Jan 1993 – Apr 2026 |
| Shannon Estate O-9-15812 | Trek Resources, Inc. only | Noelke (Wolfcamp, Lower) | Crockett | 4 | 1.39M | 371K | Sep 2005 – Apr 2026 |
| XBC Giddings Estate B O-9-17101 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 17 | 1.33M | 3.01M | Mar 2010 – Apr 2026 |
| Shannon Estate O-9-1138 | Aspen Operating Company, L.L.C. only | Olson | Crockett | 50 | 1.32M | 25 | Jan 1993 – Apr 2026 |
| Post Estate O-11-1910 | Brown, Geo. R Partnership,lp,the only | Garza | Garza | 25 | 1.25M | 132K | Jan 1993 – Apr 2026 |
| Riley, T. S. Estate "B" O-11-8449 | Hilcorp Energy Company only | Russell, North (Devonian) | Gaines | 14 | 1.22M | 218K | Jan 1993 – Apr 2026 |
| Pierce Estates O-3-6720 | Remora Management, LLC only | Withers, North (-C- Sand) | Wharton | 22 | 1.21M | 851K | Jan 1993 – Apr 2026 |
| Burnett, S. B. Estate "RRR" O-11-65414 | High River Res Operating, LLC only | Big RRR (South, Conglomerate) | King | 10 | 1.11M | 235K | Jan 1993 – Apr 2026 |
| Barnes, D. E. Estate O-10-38700 | Apache Corporation only | Phantom (Wolfcamp) | Ward | 4 | 1.02M | 1.33M | Sep 2007 – Apr 2026 |
| Pierce Estates B O-3-24339 | Remora Management, LLC only | Magnet Withers (F-13-A) | Wharton | 8 | 983K | 602K | Apr 2003 – Apr 2026 |
| Pierce Estates, Inc. O-3-4526 | McGowan Working Partners, Inc. only | Withers, North | Wharton | 39 | 980K | 289K | Jan 1993 – Apr 2026 |
| Shannon Estate -B- O-9-1277 | Clark Oil Co. only | Shannon (San Andres) | Crockett | 57 | 945K | 22 | Jan 1993 – Apr 2026 |
| Guitar Estate -B- O-10-31757 | Americo Energy Resources, LLC only | Zebulon | Howard | 4 | 944K | 60.9K | Jan 1993 – Apr 2026 |
| Pierson, William Estate O-11-18452 | Hilcorp Energy Company only | Russell, S. (San Andres) | Gaines | 7 | 941K | 1.02M | Jan 1993 – Apr 2026 |
| Gordin Estate O-2-807 | Hilcorp Energy Company only | La Ward, North | Jackson | 21 | 896K | 590K | Jan 1993 – Apr 2026 |
| XBC Giddings Estate A O-9-16409 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 15 | 885K | 2.02M | Dec 2007 – Mar 2021 |
| Cowden Estate et Al O-10-13599 | Scout Energy Management LLC only | Dollarhide, East (Ellenburger) | Andrews | 9 | 875K | 949K | Jan 1993 – Jan 2014 |
| Bennett, Mills Estate Fee O-4-12672 | Atlas Operating LLC only | Mills Bennett (Consolidated) | Brooks | 49 | 875K | 1.37M | Feb 1997 – Mar 2026 |
| Burnett, S. B. Estate "NB" O-11-64964 | Hunt Oil Company only | Big -N- (Twin Peaks) | King | 9 | 862K | 160K | Jan 1993 – Sep 2012 |
| Pierce Estates -A- O-3-3349 | Remora Management, LLC only | Pickett Ridge | Wharton | 22 | 843K | 153K | Jan 1993 – Apr 2026 |
| Burnett, S. B. Estate "RRR" O-11-66430 | High River Res Operating, LLC only | Big RRR (Twin Peaks, South) | King | 8 | 837K | 85.1K | Jan 1993 – Apr 2026 |
| XBC Giddings Estate D O-9-16572 | Pioneer Natural Res. USA, Inc. only | Spraberry (Trend Area) | Upton | 15 | 821K | 1.22M | Dec 2007 – Apr 2026 |
| Pierson, William Estate O-11-5202 | Hilcorp Energy Company only | Russell (Glorieta 6100) | Gaines | 11 | 810K | 521K | Jan 1993 – Apr 2026 |
| Burnett, S. B. Estate "N" O-11-61435 | Hunt Oil Company only | Anne Tandy (Strawn, Lo.) | King | 22 | 807K | 41.7K | Jan 1993 – Sep 2012 |
| Pierce Estates O-3-6719 | Remora Management, LLC only | Withers, North | Wharton | 23 | 782K | 1.1M | Jan 1993 – Apr 2026 |
| Slaughter, A. A. Estate O-11-60736 | Burk Royalty Co., Ltd. only | D-L-S (San Andres) | Hockley | 84 | 782K | 545K | Jan 1993 – Apr 2026 |
| Burnett, S. B. Estate "W" O-11-60889 | Hunt Oil Company only | Twin Peaks (Strawn, UP) | King | 40 | 754K | 30.1K | Jan 1993 – Sep 2012 |
| Burnett, S. B. Estate "NA" O-11-61679 | Hunt Oil Company only | Anne Tandy (Strawn, Lo.) | King | 15 | 733K | 96.3K | Jan 1993 – Sep 2012 |
| Garrett, Horace Estate et al -A- O-10-32409 | Partee Drilling Inc. only | Howard-Glasscock (Wolfcamp 7400) | Howard | 12 | 717K | 2.39M | Jan 1993 – Feb 2026 |
| Stumberg Estate Unit A O-1-18892 | Murphy Expl. & Prod. Co. - USA only | Briscoe Ranch (Eagleford) | Dimmit | 3 | 682K | 1.39M | Oct 2016 – Apr 2026 |