| Keys Unit G-2-294810 | Magnolia Oil & Gas Operating LLC only | Sugarkane (Austin Chalk) | Karnes | 1 | 227K | 1.48M | May 2022 – Aug 2026 |
| Byerly a - Caskey B SA 1 G-2-288289 | BPX Operating Company only | Eagleville (Eagle Ford-2) | De Witt | 1 | 226K | 1.68M | Nov 2019 – Aug 2026 |
| Turkey Creek D G-1-291714 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | Gonzales | 1 | 222K | 621K | Jan 2020 – Aug 2026 |
| Lost Keys 4345 3U G-10-293971 | PDC Permian, Inc. only | Phantom (Wolfcamp) | Reeves | 1 | 222K | 1.27M | Apr 2023 – Aug 2026 |
| Smokey One G-3-300669 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Washington | 1 | 217K | 1.21M | Sep 2025 – Aug 2026 |
| Sockeye B G-1-291846 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | La Salle | 1 | 206K | 375K | Jun 2019 – Aug 2026 |
| Turkey Creek B G-1-291705 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | Gonzales | 1 | 188K | 516K | Jan 2020 – Aug 2026 |
| Migura B - Caskey B SA 6 G-2-288307 | BPX Operating Company only | Eagleville (Eagle Ford-2) | De Witt | 1 | 187K | 1.39M | Jan 2020 – Aug 2026 |
| Smokey Five G-3-300662 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Washington | 1 | 185K | 936K | Sep 2025 – Aug 2026 |
| Crawford/Acom G-3-181689 | Key Energy Services, LLC only | Angelina (12,500) | Jefferson | 1 | 185K | 7.85M | Sep 2000 – Jun 2010 |
| Lost Keys 4345 5U G-10-293490 | PDC Permian, Inc. only | Phantom (Wolfcamp) | Reeves | 1 | 178K | 2.36M | Mar 2023 – Aug 2026 |
| Debakey Unit G-3-147059 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Fayette | 1 | 177K | 4.7M | Sep 1993 – Aug 2026 |
| Caskey A G-2-295918 | BPX Operating Company only | Eagleville (Eagle Ford-2) | De Witt | 1 | 166K | 699K | Oct 2019 – Aug 2026 |
| Smokey Nine G-3-300805 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Washington | 1 | 140K | 873K | Sep 2025 – Aug 2026 |
| Sockeye A G-1-291900 | EOG Resources, Inc. only | Eagleville (Eagle Ford-1) | La Salle | 1 | 140K | 448K | Jun 2019 – Aug 2026 |
| Smokey Three G-3-300661 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Washington | 1 | 139K | 928K | Sep 2025 – Aug 2026 |
| Petoskey State G-10-278889 | COG Operating LLC only | Ford, West (Wolfcamp) | Culberson | 1 | 131K | 2.77M | Oct 2015 – Mar 2026 |
| Migura B - Caskey B SA 5 G-2-288306 | BPX Operating Company only | Eagleville (Eagle Ford-2) | De Witt | 1 | 116K | 793K | Jan 2020 – Oct 2025 |
| Keyser-Boyett Unit G-3-144820 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Brazos | 1 | 94.5K | 4.32M | Feb 1993 – Aug 2026 |
| Santos-Buckeye G-3-196037 | Expro Engineering, Inc. only | Grand Slam (Claughton) | Matagorda | 1 | 77.6K | 969K | Aug 2002 – Aug 2010 |
| Robinson-Buckeye Unit G-2-242643 | Zachry Exploration, LLC only | Lonken (7030) | Jackson | 1 | 59.7K | 2.29M | Sep 2008 – Jun 2014 |
| Keystone Holt Unit G-10-199654 | Basin Oil & Gas Operating, LLC only | Keystone (Consolidated) | Winkler | 1 | 57.1K | 150K | Sep 2003 – Jun 2023 |
| Dunlap-Keyser Unit G-3-148011 | Enervest Operating, L.L.C. only | Giddings (Austin Chalk, Gas) | Brazos | 1 | 54K | 1.77M | Nov 1993 – May 1998 |
| Keystone Mills Co. G-3-190753 | Highmark Energy Operating, LLC only | Conroe (Middle Wilcox Cons.) | Montgomery | 1 | 41.9K | 5.49M | Jan 2002 – Sep 2007 |
| Key -11- G-14-281874 | Presidio Petroleum LLC only | Allison-Britt (12350) | Wheeler | 1 | 40.5K | 1.96M | Nov 2016 – Aug 2026 |
| McAfee, Willie G-6-110755 | Silver Oak Operating, LLC only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 40.2K | 413K | by Jan 1993 – Aug 2026 |
| Mackey, W D G-6-265638 | Buffco Production Inc. only | Lansing, N. (Cotton Valley, Lo.) | Gregg | 1 | 39.3K | 1.13M | Sep 2012 – Aug 2026 |
| Caskey A G-2-287893 | Devon Energy Production Co, L.P. only | Eagleville (Eagle Ford-2) | De Witt | 1 | 37.3K | 110K | Oct 2019 – Oct 2019 |
| Caskey A G-2-287889 | BPX Operating Company only | Eagleville (Eagle Ford-2) | De Witt | 1 | 37.3K | 172K | Apr 2021 – Feb 2026 |
| Mackey Heirs G-6-142093 | Dallas Production Company LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 36.4K | 1.44M | by Jan 1993 – Aug 2026 |
| Walton, J. B. G-10-154768 | Bass Enterprises Production Co. only | Keystone (Ellenburger) | Winkler | 1 | 36.2K | 2.71M | Jun 1995 – Mar 1998 |
| Parkey Unit G-13-204941 | Lime Rock Resources IV-a, L.P. only | Newark, East (Barnett Shale) | Denton | 1 | 30.3K | 1.01M | Nov 2004 – Jul 2026 |
| South Keystone /Ellen/ Unit G-10-140449 | Pennzoil Exploration & Prod. Co. only | Keystone (Ellenburger) | Winkler | 1 | 30K | 152K | by Jan 1993 – Jul 1997 |
| State-Walton G-10-279776 | Basin Oil & Gas Operating, LLC only | Keystone (Consolidated) | Winkler | 1 | 28.1K | 87.1K | Sep 2015 – Aug 2026 |
| Mackey Heirs G-6-143362 | Dallas Production Company LLC only | Willow Springs (Cotton Valley) | Gregg | 1 | 27.7K | 3.64M | by Jan 1993 – Jun 2026 |
| Walton, J. B. -A- G-10-155826 | Bopco, L.P. only | Keystone (Ellenburger) | Winkler | 1 | 26.9K | 4.3M | Sep 1995 – May 2011 |
| Bashara, M. J. -C- G-10-20394 | Hilcorp Energy Company only | Keystone (Dev-McKee Cons) | Winkler | 1 | 24.7K | 1.08M | by Jan 1993 – Jun 2025 |
| Keystone Holt Unit G-10-173986 | Basin Oil & Gas Operating, LLC only | Keystone (Consolidated) | Winkler | 1 | 24.2K | 1.87M | Jul 1999 – Oct 2022 |
| Turkey Creek G-3-154615 | Magnolia Oil & Gas Operating LLC only | Giddings (Austin Chalk-3) | Grimes | 1 | 23.9K | 4.28M | May 1995 – Aug 2026 |
| Coffee Estate G-14-246837 | Unbridled Resources, LLC only | Shreikey (Granite Wash) | Roberts | 1 | 23.1K | 437K | Oct 2008 – Sep 2024 |
| Flewellen G-6-98005 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 23K | 1.73M | Jul 1993 – Aug 2026 |
| Allegro-Buckeye G-3-202774 | Gaither Petroleum Corporation only | Duncan Slough (Frio Cons.) | Matagorda | 1 | 22.4K | 1.1M | Feb 2004 – Nov 2014 |
| Key, Dolly Bell G-6-230839 | Diversified Production LLC only | White Oak (Cotton Valley Sand) | Gregg | 1 | 22.3K | 566K | Feb 2007 – Aug 2026 |
| Parkey B G-13-254547 | Lime Rock Resources IV-a, L.P. only | Newark, East (Barnett Shale) | Denton | 1 | 20.2K | 1.67M | Jan 2010 – Jul 2026 |
| McCoy G-14-258737 | United Oil & Shale LLC only | Shreikey (Granite Wash) | Roberts | 1 | 20.2K | 1.05M | Jun 2010 – May 2022 |
| Parkey Unit G-13-213440 | Lime Rock Resources IV-a, L.P. only | Newark, East (Barnett Shale) | Denton | 1 | 20.1K | 1.05M | Oct 2005 – Jul 2026 |
| Culpepper G-6-86669 | Neches Exploration, L.L.C. only | Willow Springs-Mackey (Tr. Pk.) | Gregg | 1 | 19.4K | 1.46M | by Jan 1993 – Aug 2026 |
| Beck "B" G-9-163547 | Sullivan, Hollis R. Inc. only | Turkey Draw Beck Ranch (Harkey) | Concho | 1 | 18.6K | 227K | Mar 1997 – Dec 2002 |
| Key G-3-88869 | Wildfire Energy Operating LLC only | Madisonville (Sub-Clark, Gas) | Madison | 1 | 17.5K | 1.29M | by Jan 1993 – Jul 2026 |
| Lovett-Sinclair G-10-110889 | Basin Oil & Gas Operating, LLC only | Keystone (Consolidated) | Winkler | 1 | 17.4K | 1.97M | by Jan 1993 – Sep 2017 |