| Walker, M. P. G-3-148090 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 401K | 3.45M | Dec 1993 – Feb 2026 |
| Walker, M. P. G-3-149172 | Verdun Oil & Gas LLC only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 387K | 2.82M | Mar 1994 – Apr 2026 |
| Walker Gas Unit 1 G-4-192179 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 270K | 8.82M | Nov 2002 – Dec 2008 |
| Walker Gas Unit 1 G-4-191422 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 214K | 6.38M | Aug 2002 – May 2017 |
| Walker G-14-280716 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 137K | 747K | Jan 2016 – Apr 2026 |
| Walker 29 G-14-281022 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 127K | 848K | Jun 2016 – Apr 2026 |
| McKenzie 85 G-10-184469 | Alpine Gas Company, LLC only | Walker (Penn Detrital) | Pecos | 1 | 119K | 2.76M | Dec 2001 – May 2005 |
| Raceway-Walker Unit G-3-151761 | Seneca Resources Corporation only | Mulligan, NE. (Austin Chalk) | Brazos | 1 | 104K | 541K | Jun 1994 – Jul 1999 |
| Walker G-14-270583 | Unbridled Resources, LLC only | Lipscomb (Cleveland) | Lipscomb | 1 | 101K | 641K | Oct 2013 – Apr 2026 |
| Walker 29 G-14-281409 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 99.1K | 648K | Jun 2016 – Apr 2026 |
| Walker G-14-280788 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 83.8K | 529K | May 2016 – Apr 2026 |
| Walker 29 G-14-279034 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 62.4K | 570K | Oct 2015 – Apr 2026 |
| Walker Gas Unit 1 G-4-193078 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 61.9K | 1.79M | Jan 2003 – Jul 2023 |
| Walker a Unit G-13-274047 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Montague | 1 | 56.8K | 1.36M | May 2012 – Apr 2026 |
| Walker Gas Unit 1 G-4-194709 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 52.7K | 894K | Apr 2003 – May 2017 |
| Wiesehan-Walker Gas Unit G-4-65595 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 51.5K | 4.44M | Jan 1993 – Apr 2026 |
| Wiesehan-Walker Gas Unit G-4-187343 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 51.5K | 4.71M | Feb 2002 – Apr 2026 |
| Walker Gas Unit 1 G-4-194255 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 45.1K | 701K | Mar 2003 – Aug 2008 |
| McKenzie State 6 G-10-184468 | Alpine Gas Company, LLC only | Walker (Penn Detrital) | Pecos | 1 | 43.4K | 435K | Dec 2001 – May 2005 |
| Walker G-10-56377 | Mongoose Energy, LLC only | Gomez (Ellenburger) | Pecos | 1 | 42.7K | 11.9M | Jan 1993 – Apr 2026 |
| Wiesehan-Walker Gas Unit G-4-136226 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 42.5K | 5.7M | Jan 1993 – Apr 2026 |
| Walker 29 G-14-279822 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 41.4K | 428K | Feb 2016 – Jul 2024 |
| Walker, Billy L. G-4-153063 | Mortimer Production Company only | Arroyo Los Olmos (Yegua 25) | Starr | 1 | 41K | 3.76M | Jan 1995 – Apr 2026 |
| Wiesehan-Walker Gas Unit G-4-241952 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 39.8K | 3.93M | Jul 2008 – Apr 2026 |
| Walker G-14-278982 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 37.2K | 314K | Oct 2015 – Apr 2026 |
| Walker, T. S. "A" G-13-228196 | Eagleridge Operating, LLC only | Newark, East (Barnett Shale) | Wise | 1 | 35.8K | 1.57M | Jan 2007 – Apr 2026 |
| Walker G-14-261020 | Presidio Petroleum LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 34.7K | 2.18M | Nov 2010 – Apr 2026 |
| Ramp Walker G-14-263362 | Presidio Petroleum LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 34.4K | 2.79M | Jun 2011 – Apr 2026 |
| Walker a Unit G-13-274046 | EOG Resources, Inc. only | Newark, East (Barnett Shale) | Montague | 1 | 34.3K | 1.24M | May 2012 – Apr 2026 |
| Walker Gas Unit 1 G-4-195774 | Roy Jackson Energy Operating, LL only | Kingsville, SW (Taos) | Kleberg | 1 | 32.6K | 1.72M | Jun 2003 – Dec 2023 |
| Wiesehan-Walker Gas Unit G-4-157727 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 30.9K | 8.55M | Jan 1996 – Jul 2015 |
| Wiesehan-Walker Gas Unit G-4-255978 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 30.2K | 2.6M | Feb 2010 – Mar 2023 |
| Wiesehan-Walker Gas Unit G-4-183778 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 30.1K | 4.02M | Jun 2001 – Apr 2023 |
| Walker G-13-263557 | Scout Energy Management LLC only | Newark, East (Barnett Shale) | Montague | 1 | 29K | 1.4M | Jan 2012 – Apr 2026 |
| Walker G-13-264058 | Scout Energy Management LLC only | Newark, East (Barnett Shale) | Montague | 1 | 27.8K | 885K | Dec 2011 – Apr 2026 |
| Wiesehan-Walker Gas Unit G-4-145836 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 26.5K | 7.16M | May 1993 – Oct 2022 |
| Walker 29 G-14-282092 | Presidio Petroleum LLC only | Hemphill (Douglas) | Hemphill | 1 | 26.2K | 316K | Dec 2016 – Apr 2026 |
| Wiesehan-Walker Gas Unit G-4-226014 | Merit Energy Company only | Javelina (Vicksburg Cons.) | Hidalgo | 1 | 25K | 3.45M | Jan 2007 – Apr 2026 |
| Cheryl "51" G-8-212084 | Marjac Oil Company, Inc. only | Walker-Davis (Marble Falls) | Stephens | 1 | 24.7K | 239K | Nov 2005 – Apr 2026 |
| Ramp Walker 11 G-14-282769 | Presidio Petroleum LLC only | Buffalo Wallow (Granite Wash) | Hemphill | 1 | 24.3K | 2.19M | Jun 2017 – Apr 2026 |
| Walker, Laura G-6-146287 | Cotton Valley Operations, Inc. only | White Oak (Cotton Valley Sand) | Gregg | 1 | 22.1K | 1.63M | Sep 1993 – Mar 2019 |
| Johnnie Walker State G-10-278929 | COG Operating LLC only | Sandbar (Bone Spring) | Reeves | 1 | 21.2K | 812K | Aug 2012 – Oct 2017 |
| Walker, Billy L. G-4-185319 | Mortimer Production Company only | Arroyo Los Olmos (Yegua 25) | Starr | 1 | 20.3K | 2.1M | Sep 2001 – Apr 2026 |
| Walker, Billy L G-4-274294 | Mortimer Production Company only | Arroyo Los Olmos (Yegua 25) | Starr | 1 | 19.1K | 880K | Apr 2014 – Apr 2026 |
| Walker-Buckler G-8-102463 | Sojourner Drilling Corporation only | Rockwell (Gardner) | Shackelford | 1 | 19K | 236K | May 1993 – Apr 2026 |
| Walker, Isabella Lease G-6-156046 | Merit Energy Company only | Glenwood (Cotton Valley) | Upshur | 1 | 18K | 1.55M | Aug 1995 – Oct 2015 |
| Walker G-13-263586 | Scout Energy Management LLC only | Newark, East (Barnett Shale) | Montague | 1 | 17.4K | 402K | Dec 2011 – Oct 2023 |
| Walker Heirs Unit G-6-245646 | RFE Operating, LLC only | Woodlawn (Cotton Valley) | Marion | 1 | 16.4K | 1.4M | Jan 2009 – Jul 2024 |
| White & Baker State G-10-267216 | Tatanka Operating, LLC only | Walker (Penn Detrital) | Pecos | 1 | 16.2K | 1.1M | Dec 2012 – May 2019 |
| Walker G-3-182406 | Ballard Exploration Company,inc. only | Dyersdale (Wilcox 12100) | Harris | 1 | 16K | 1.4M | Dec 2001 – Dec 2013 |