| Union Valley A1 O-10-62951 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 542K | 599K | Feb 2024 – Aug 2026 |
| Union Valley A7 O-10-62959 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 410K | 377K | Mar 2024 – Aug 2026 |
| Union Hill G-3-286732 | Geosouthern Operating II, LLC only | Giddings (Austin Chalk, Gas) | Washington | 1 | 380K | 5.62M | Feb 2019 – Aug 2026 |
| Brown-Donner Unit A-567 G-6-153267 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 370K | 2.15M | Dec 1994 – Aug 1998 |
| Fowler, E. L. 302 O-5-3215 | Union Oil Company of California only | Van (Austin Chalk) | Van Zandt | 15 | 351K | 816K | by Jan 1993 – Apr 2011 |
| Tunnell, I. P. 300 O-5-3199 | Union Oil Company of California only | Van (Austin Chalk) | Van Zandt | 11 | 335K | 821K | by Jan 1993 – Sep 2011 |
| Citori Unit O-3-23062 | Union Pacific Resources Company only | Giddings (Buda) | Milam | 1 | 283K | 126K | Jul 1996 – Mar 1999 |
| Union Valley A2 O-10-63043 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 261K | 384K | Feb 2024 – Aug 2026 |
| Arco Fee Unit A-121 G-6-151133 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Jasper | 1 | 254K | 2.6M | May 1994 – Mar 2000 |
| Mahlmann-Walther Unit G-3-141715 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Fayette | 1 | 252K | 2.3M | by Jan 1993 – Aug 1999 |
| Parker, J. E. -B- O-10-252 | Union Oil Company of California only | Andrews (Pennsylvanian) | Andrews | 7 | 251K | 369K | Sep 1993 – Sep 1995 |
| Union Valley A5 O-10-63002 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 247K | 336K | Mar 2024 – Aug 2026 |
| Pocahontas Unit G-3-161527 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Fayette | 1 | 245K | 929K | Nov 1996 – Aug 1999 |
| Boeker-Union Hill AW-D G-3-294660 | Geosouthern Operating II, LLC only | Giddings (Austin Chalk, Gas) | Washington | 1 | 236K | 4.33M | Dec 2022 – Aug 2026 |
| Union Valley A3 O-10-62952 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 235K | 329K | Mar 2024 – Aug 2026 |
| Ashford O-6-12102 | Reynolds E & P, Inc. only | Old Union (Rodessa) | Bowie | 3 | 234K | 4.6K | by Jan 1993 – Mar 2017 |
| Biles, J. D. O-10-7038 | Unitex Oil & Gas, L.L.C. only | Union | Andrews | 9 | 231K | 332K | by Jan 1993 – Aug 2026 |
| Thompson 49 O-5-3256 | Union Oil Company of California only | Van (Austin Chalk) | Van Zandt | 9 | 222K | 432K | by Jan 1993 – Sep 2017 |
| Union Valley A6 O-10-62958 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 220K | 298K | Mar 2024 – Aug 2026 |
| Terry, H. L. Unit G-3-146621 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 215K | 2.05M | Jul 1993 – Aug 1999 |
| Arco Fee G-3-148623 | Union Oil Company of California only | Felicia Creek (y-4 Sand) | Liberty | 1 | 213K | 3.49M | Nov 1993 – Jul 1995 |
| State Tract 562-L O-2-7602 | Tri-Union Development Corp. only | Matagorda Block 562-L (6470) | Matgrda IS-LB | 1 | 212K | 193K | by Jan 1993 – Sep 1999 |
| Parker, J. E. -C- (Amoco) O-10-266 | Union Oil Company of California only | Andrews (Wolfcamp) | Andrews | 6 | 207K | 299K | by Jan 1993 – Sep 1995 |
| Union Valley A4 O-10-62953 | Apache Corporation only | Spraberry (Trend Area) | Dawson | 1 | 206K | 276K | Mar 2024 – Aug 2026 |
| Allen G-3-145818 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 188K | 1.3M | May 1993 – Aug 1999 |
| Union Keeran O-2-8537 | Remora Management, LLC only | Keeran (6130) | Victoria | 1 | 188K | 90.5K | Jun 1999 – Dec 2016 |
| Franus Unit G-3-156437 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Grimes | 1 | 187K | 2.41M | Sep 1995 – Feb 2000 |
| McCullough-McCullough 'A' G-3-145083 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 187K | 1.49M | by Jan 1993 – Feb 2000 |
| Boeker-Union Hill AW-A G-3-294644 | Geosouthern Operating II, LLC only | Giddings (Austin Chalk, Gas) | Washington | 1 | 187K | 2.49M | Dec 2022 – Aug 2026 |
| Boeker-Union Hill AW-C G-3-294773 | Geosouthern Operating II, LLC only | Giddings (Austin Chalk, Gas) | Washington | 1 | 184K | 3.16M | Dec 2022 – Aug 2026 |
| York, Ella 102 O-5-1136 | Union Oil Company of California only | Van | Van Zandt | 12 | 179K | 76.7K | by Jan 1993 – May 2014 |
| Cannon Unit G-3-155696 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Grimes | 1 | 179K | 1.28M | Jun 1995 – Aug 1999 |
| Jawbreaker Unit G-3-151736 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Fayette | 1 | 174K | 1.3M | Sep 1994 – Aug 1999 |
| Parker, J. E., -C- O-10-14698 | Union Oil Company of California only | Andrews, North (Strawn) | Andrews | 3 | 164K | 308K | by Jan 1993 – Nov 1997 |
| Parker, J. E. -B- O-10-34689 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 7 | 163K | 374K | Oct 1995 – Nov 1997 |
| Champion Int'l Unit A-1175 G-6-155820 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 159K | 833K | Jul 1995 – Jan 1999 |
| Caledonia O-11-67412 | Union Oil Company of California only | Blackwatch (San Andres) | Gaines | 4 | 157K | 50K | Jun 1995 – Sep 1997 |
| Mueller-Korth Unit G-3-148108 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Lee | 1 | 155K | 751K | Jan 1994 – Aug 1999 |
| Parker, J. E. -C- (Amoco) O-10-34685 | Union Oil Company of California only | Andrews (Wolfcamp-Penn.) | Andrews | 7 | 154K | 362K | Oct 1995 – Nov 1997 |
| Jawbreaker Unit O-3-22384 | Union Pacific Resources Company only | Giddings (Austin Chalk-3) | Fayette | 1 | 151K | 610K | Apr 1994 – Sep 1994 |
| Jarman, W. T. 37 O-5-3608 | Union Oil Company of California only | Van (Rodessa) | Van Zandt | 5 | 143K | 442K | Nov 1997 – Oct 1999 |
| Champion a-334 Unit G-6-152455 | Union Pacific Resources Company only | Brookeland (Austin Chalk, 8800) | Newton | 1 | 143K | 1.21M | Jul 1994 – Dec 1998 |
| Cumbie 32 O-5-3232 | Union Oil Company of California only | Van (Austin Chalk) | Van Zandt | 5 | 142K | 303K | by Jan 1993 – Jun 2009 |
| Brazos Coal Ltd.-Terry "B" Unit G-3-146180 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 134K | 915K | Jun 1993 – Aug 1999 |
| Durham A O-13-29071 | Mountain Creek Oil Company, Inc. only | Union Cemetery (Strawn) | Montague | 4 | 133K | 0 | Dec 1995 – Aug 2026 |
| Murphree J. J. 31 O-5-3654 | Union Oil Company of California only | Van (Rodessa) | Van Zandt | 3 | 128K | 585K | Sep 1998 – Feb 2010 |
| Boeker-Union Hill AW-B G-3-294645 | Geosouthern Operating II, LLC only | Giddings (Austin Chalk, Gas) | Washington | 1 | 128K | 2.28M | Dec 2022 – Aug 2026 |
| Jarmen, W. T. 37 O-5-3627 | Union Oil Company of California only | Van (Upper Carlile) | Van Zandt | 3 | 128K | 74.5K | Mar 1998 – Oct 1999 |
| Wagnon Unit G-3-153709 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Grimes | 1 | 127K | 966K | Feb 1995 – Aug 1999 |
| Texas A&m University G-3-248058 | Union Gas Operating Company only | Bleakwood, South (Middle Wilcox) | Newton | 1 | 127K | 3.13M | Dec 2008 – Jun 2023 |