| Walter Co. G-3-260140 | Hilcorp Energy Company only | Constitution (Westbury) | Jefferson | 1 | 319K | 2.13M | Jan 2011 – Aug 2026 |
| Walter Co. G-3-271201 | Hilcorp Energy Company only | Constitution (Westbury) | Jefferson | 1 | 305K | 3.08M | Sep 2013 – Aug 2026 |
| Walter Company "D" G-3-221521 | Ballard Exploration Company,inc. only | China (Yegua Cons.) | Jefferson | 1 | 292K | 2.53M | May 2006 – Nov 2014 |
| 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 |
| Waltman G-3-154083 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 239K | 2.34M | Mar 1995 – Feb 2017 |
| BSM A-471 G-6-292313 | Walter Oil & Gas Corporation only | Brookeland (Austin Chalk, 8800) | Polk | 1 | 227K | 1.59M | Feb 2022 – May 2025 |
| Walter 24 G-14-280850 | Presidio Petroleum LLC only | Lipscomb, S.E. (Cleveland) | Hemphill | 1 | 126K | 1.85M | Apr 2016 – Aug 2026 |
| State Tract 806-S G-4-201698 | Walter Oil & Gas Corporation only | Matagorda 806 (Frio 11100) | Matgrda IS-SB | 1 | 111K | 2.85M | Sep 2004 – Jul 2011 |
| Walton, Augusta et Al G-14-265031 | Mewbourne Oil Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 85.4K | 1.49M | Aug 2011 – Aug 2026 |
| Scott, Walter G-6-142215 | Atlas Operating LLC only | Chapel Hill (Rodessa) | Smith | 1 | 81.3K | 1.41M | by Jan 1993 – Apr 2026 |
| Woods A-82 G-3-234640 | Walter Oil & Gas Corporation only | Double a Wells, N (Austin Chalk) | Polk | 1 | 81.3K | 499K | Sep 2007 – Mar 2023 |
| Waltrip G-3-154729 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Grimes | 1 | 69.4K | 8.66M | May 1995 – Aug 2026 |
| Walter Wernli 01 G-2-271138 | Marathon Oil EF LLC only | Sugarkane (Eagle Ford) | Bee | 1 | 59.1K | 2.08M | Aug 2013 – Jul 2026 |
| BSM Cannon A-95 G-6-295222 | Walter Oil & Gas Corporation only | Brookeland (Austin Chalk, 8800) | Polk | 1 | 56.2K | 504K | Jan 2023 – May 2025 |
| Walter Co. "B" G-3-186632 | Ballard Exploration Company,inc. only | China (Vicksburg) | Jefferson | 1 | 53.2K | 710K | Oct 2001 – Sep 2003 |
| Walter 24 G-14-282909 | Presidio Petroleum LLC only | Lipscomb, S.E. (Cleveland) | Hemphill | 1 | 50.9K | 795K | May 2017 – Aug 2026 |
| Walton, Augusta et Al G-14-271321 | Mewbourne Oil Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 49.7K | 908K | Jul 2013 – Aug 2026 |
| Walter Company "C" St G-3-222123 | Ballard Exploration Company,inc. only | China (Yegua Cons.) | Jefferson | 1 | 48.5K | 789K | Feb 2006 – Feb 2012 |
| Walton, Augusta G-14-262716 | Mewbourne Oil Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 42K | 864K | Jun 2011 – Aug 2026 |
| Grant "A" G-4-186062 | Walter Oil & Gas Corporation only | McCampbell (Frio P, Upper) | Aransas | 1 | 37.3K | 949K | Mar 2001 – Feb 2003 |
| Walton, Augusta G-14-275963 | Mewbourne Oil Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 36.5K | 901K | Jan 2014 – Aug 2026 |
| Griffith "A" G-3-180152 | Walter Exploration Company only | Stuart Creek (10200 Wilcox) | Colorado | 1 | 36.4K | 813K | Oct 2000 – Sep 2015 |
| Walton, J. B. G-10-154768 | Bass Enterprises Production Co. only | Keystone (Ellenburger) | Winkler | 1 | 36.2K | 2.71M | Jun 1995 – Mar 1998 |
| Kallina G-3-172147 | Walter Oil & Gas Corporation only | Kacee (Cruel) | Colorado | 1 | 33.3K | 3.8M | Dec 1998 – Jan 2001 |
| Walton, Augusta G-14-267730 | Mewbourne Oil Company only | Lipscomb (Cleveland) | Lipscomb | 1 | 32.1K | 880K | Mar 2013 – Aug 2026 |
| State-Walton "E" G-10-159640 | Formentera Operations LLC only | Kermit (McKee) | Winkler | 1 | 31.9K | 744K | Jul 1996 – Mar 2026 |
| State Walton G-10-173356 | Basin Oil & Gas Operating, LLC only | Kermit (McKee) | Winkler | 1 | 31.6K | 4M | May 1999 – Aug 2026 |
| Walton OL G-3-155050 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Brazos | 1 | 29K | 7.28M | Apr 1995 – Aug 2026 |
| Broyles G-3-200344 | Walter Oil & Gas Corporation only | Chesterville, North (Yegua 7) | Colorado | 1 | 28.3K | 206K | Nov 2003 – Aug 2005 |
| State-Walton G-10-279776 | Basin Oil & Gas Operating, LLC only | Keystone (Consolidated) | Winkler | 1 | 28.1K | 87.1K | Sep 2015 – Aug 2026 |
| Morgan G-3-295852 | Walter Oil & Gas Corporation only | Brookshire (6800 Sand) | Waller | 1 | 28.1K | 1.23M | Jul 2023 – Aug 2026 |
| Walton, J. B. -A- G-10-155826 | Bopco, L.P. only | Keystone (Ellenburger) | Winkler | 1 | 26.9K | 4.3M | Sep 1995 – May 2011 |
| Walton, W. W. Ltd G-4-184651 | Whiting Oil and Gas Corporation only | Agua Dulce (Vicksburg Consl.) | Nueces | 1 | 21.9K | 1.13M | Sep 2001 – Aug 2008 |
| Walters, Dorothy G-2-152258 | Mountain V Texas, LLC only | Provident City (Yegua 5770) | Lavaca | 1 | 20.2K | 1.54M | Nov 1994 – Jul 2010 |
| Vastar-Duncan "E" G-3-171201 | Walter Oil & Gas Corporation only | Egypt (7950) | Wharton | 1 | 19.7K | 2.58M | Oct 1998 – Apr 2001 |
| Walter Ranch G-13-279085 | FX Energy Operating, LLC only | KRS (Marble Falls) | Palo Pinto | 1 | 18.1K | 697K | Dec 2015 – Aug 2026 |
| Walton-Matthews Unit G-4-218788 | STS Petroleum LLC only | Agua Dulce (Vicksburg Consl.) | Nueces | 1 | 17.8K | 577K | Apr 2006 – Apr 2013 |
| S. T. 310-L S/2/NE/4 G-3-159858 | Walter Oil & Gas Corporation only | Cyclone (Rob 43 6350 Res. A) | Galveston-LB | 1 | 17.5K | 8.11M | May 1996 – Apr 2011 |
| Waltman-Chance Farms Unit G-3-144378 | Union Pacific Resources Company only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 17.3K | 89K | by Jan 1993 – Feb 1997 |
| Despain, Walter G-4-185464 | Hilcorp Energy Company only | Vaquillas Ranch (Lobo Cons.) | Webb | 1 | 16.9K | 2.68M | Sep 2001 – Aug 2026 |
| Vilas-Walton G-3-160200 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 16.8K | 2.39M | Apr 1996 – Mar 2026 |
| Walton, W. W. G-4-261019 | Republic Resources, LLC. only | Doughty (Frio 7060) | Nueces | 1 | 16.7K | 226K | Jan 2011 – Jun 2013 |
| S.T. 341-L S/2 NE/4 G-3-166206 | Walter Oil & Gas Corporation only | Brazos Block 341-L (RM6) | Brazos-LB | 1 | 15.9K | 7.06M | Nov 1997 – Jun 2001 |
| Walton G-2-265536 | Sydson Energy, Inc. only | Ray (Vicksburg-Hockley) | Bee | 1 | 15.7K | 99K | Jun 2012 – Feb 2024 |
| Walter Ranch G-13-279083 | FX Energy Operating, LLC only | KRS (Marble Falls) | Palo Pinto | 1 | 15.3K | 485K | Dec 2015 – Aug 2026 |
| Walton, W.W. "A" G-4-153800 | Urban Oil & Gas Group, LLC only | Agua Dulce (Consolidated Frio) | Nueces | 1 | 14.5K | 914K | Feb 1995 – Aug 2026 |
| S. T. 310-L S/2 NE/4 G-3-160339 | Walter Oil & Gas Corporation only | Cyclone (Rob 43 6350 Res. A) | Galveston-LB | 1 | 14.5K | 6.04M | Jun 1996 – Apr 2011 |
| Walter Ranch G-13-279379 | FX Energy Operating, LLC only | KRS (Marble Falls) | Palo Pinto | 1 | 14.1K | 366K | Nov 2015 – Aug 2026 |
| Brown, Walter B. G-6-47256 | TTK Energy LLC only | Nevis (Rodessa) | Anderson | 1 | 13.7K | 559K | by Jan 1993 – Mar 2025 |
| Broyles G-3-221755 | Walter Oil & Gas Corporation only | Chesterville, North (Yegua 6300) | Colorado | 1 | 13.6K | 1.39M | Oct 2006 – Feb 2012 |