| Tubb, J. B. a/C 2 O-10-5296 | Formentera Operations LLC | Sand Hills (Tubb) | Crane | 24 | 289K | 2.63M | by Jan 1993 – Jan 2024 |
| Hargis O-1-18890 | Formentera Operations LLC | Briscoe Ranch (Eagleford) | Zavala | 2 | 285K | 220K | Apr 2016 – Jul 2026 |
| Carlinville National Bank O-10-15281 | Formentera Operations LLC | Yarbrough & Allen (Devonian) | Ector | 5 | 285K | 399K | by Jan 1993 – Aug 2026 |
| Whiting 10 O-10-50233 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 284K | 404K | Oct 2017 – Aug 2026 |
| Bashara-Prothro O-10-46977 | Formentera Operations LLC | Keystone (Consolidated) | Winkler | 10 | 281K | 1.49M | Sep 2015 – Aug 2026 |
| Tubb, J. B. -C- O-10-58256 | Formentera Operations LLC | Sand Hills (Wichita Albany, S.) | Crane | 13 | 278K | 3.37M | Aug 2022 – Aug 2026 |
| Owens, Jeff O-9-331 | Formentera Operations LLC | Clara Couch | Crockett | 14 | 274K | 21 | by Jan 1993 – Aug 2026 |
| East Keystone (San a Holt Unit) O-10-46985 | Formentera Operations LLC | Keystone (Consolidated) | Winkler | 76 | 267K | 109K | Sep 2015 – Aug 2026 |
| Tubb, J. B. -C- O-10-5298 | Formentera Operations LLC | Sand Hills (Tubb) | Crane | 32 | 261K | 6.41M | by Jan 1993 – Jun 2023 |
| Stiles 18 G-14-266093 | Formentera Operations LLC | Stiles Ranch (Granite Wash Cons) | Wheeler | 1 | 259K | 7.35M | Oct 2012 – Aug 2026 |
| State-Walton a/C 2 O-10-3286 | Formentera Operations LLC | Keystone (Colby) | Winkler | 28 | 258K | 630K | by Jan 1993 – Aug 2026 |
| Tubb, J. B. -a- a/C #2 O-10-5310 | Formentera Operations LLC | Sand Hills (Tubb) | Crane | 13 | 258K | 1.94M | by Jan 1993 – Aug 2026 |
| Walton, J. B. O-10-3218 | Formentera Operations LLC | Kermit | Winkler | 43 | 257K | 402K | by Jan 1993 – Jul 2026 |
| TXL O-10-25455 | Formentera Operations LLC | Cowden, North | Ector | 7 | 256K | 520K | by Jan 1993 – Aug 2026 |
| Waddell O-10-37632 | Formentera Operations LLC | Keystone, South (Devonian) | Winkler | 5 | 248K | 811K | Dec 2005 – Sep 2025 |
| Tubb, J. B. -a- a/C #3 O-10-5270 | Formentera Operations LLC | Sand Hills (McKnight) | Crane | 19 | 246K | 1.47M | by Jan 1993 – Aug 2026 |
| Cowden 10 O-10-44518 | Formentera Operations LLC | McElroy | Crane | 3 | 246K | 563K | Aug 2013 – Aug 2026 |
| Waddell Dunes 8 O-10-53974 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 243K | 162K | Aug 2019 – Aug 2026 |
| Hentz Family A56-0407 O-10-47718 | Formentera Operations LLC | Emperor (Woodford Shale) | Winkler | 1 | 240K | 139K | Dec 2015 – Aug 2026 |
| Holdsworth Unit B O-1-19083 | Formentera Operations LLC | Briscoe Ranch (Eagleford) | Zavala | 1 | 239K | 89.9K | Dec 2016 – Aug 2026 |
| Segundo O-10-59025 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 238K | 141K | Jan 2023 – Aug 2026 |
| Stonegate 6 O-10-54946 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 236K | 187K | Dec 2019 – Aug 2026 |
| Laney, J. D. et Al O-11-3577 | Formentera Operations LLC | Levelland | Cochran | 15 | 232K | 13.7K | by Jan 1993 – Aug 2026 |
| University Devonian a 37 O-10-44626 | Formentera Operations LLC | Block 31 (Devonian) | Crane | 3 | 228K | 542K | Dec 2011 – Aug 2026 |
| Bruce and Bar O-10-50943 | Formentera Operations LLC | Flying Dove (Miss.) | Winkler | 2 | 226K | 98.4K | Feb 2018 – Aug 2026 |
| Cummins, H.E. 'K' O-10-37058 | Formentera Operations LLC | Goldsmith (Clear Fork) | Ector | 2 | 221K | 494K | Mar 2003 – Aug 2024 |
| Slator, J. D., Jr. O-10-12795 | Formentera Operations LLC | Goldsmith (Clear Fork) | Ector | 7 | 221K | 502K | by Jan 1993 – Aug 2026 |
| Tubb, J. B. -B- O-10-5297 | Formentera Operations LLC | Sand Hills (Tubb) | Crane | 25 | 220K | 7.56M | by Jan 1993 – Aug 2026 |
| Stiles 3SL G-14-265335 | Formentera Operations LLC | Stiles Ranch (Granite Wash Cons) | Wheeler | 1 | 219K | 7.54M | Sep 2011 – Aug 2026 |
| Blue, R. H. O-10-15464 | Formentera Operations LLC | Wheeler (Wolfcamp) | Ector | 4 | 217K | 1.62M | by Jan 1993 – Aug 2026 |
| Stiles 17 O-14-8972 | Formentera Operations LLC | Mills Ranch (Granite Wash Cons.) | Wheeler | 4 | 216K | 1.4M | Jul 2013 – Aug 2026 |
| Keystone Cattle Company O-10-26628 | Formentera Operations LLC | Keystone, SW. (San Andres) | Winkler | 3 | 216K | 450K | by Jan 1993 – Aug 2026 |
| V Bar 10 O-10-50874 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 2 | 215K | 132K | Jun 2018 – Aug 2026 |
| Tubb, J. B., -F- O-10-16234 | Formentera Operations LLC | Sand Hills (McKnight) | Crane | 23 | 215K | 3.76M | by Jan 1993 – Aug 2026 |
| Roper-STX O-1-21805 | Formentera Operations LLC | Indio Tanks (Pearsall) | Frio | 1 | 213K | 714K | Oct 2025 – Aug 2026 |
| Bartz 19 G-14-262065 | Formentera Operations LLC | Stiles Ranch (Granite Wash Cons) | Wheeler | 1 | 211K | 9.16M | Feb 2011 – Aug 2026 |
| Stiles 3 G-14-258760 | Formentera Operations LLC | Stiles Ranch (Granite Wash Cons) | Wheeler | 1 | 207K | 7.91M | Jul 2010 – Aug 2026 |
| University Lands 30 O-10-41966 | Formentera Operations LLC | Dune | Crane | 2 | 202K | 272K | Oct 2011 – Aug 2026 |
| TXL "K" Tract II O-10-24229 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 1 | 201K | 490K | by Jan 1993 – Aug 2026 |
| University O 25 O-10-27630 | Formentera Operations LLC | Block 31 (Devonian) | Crane | 8 | 200K | 1.38M | by Jan 1993 – Aug 2026 |
| Cahill, T. G., -B- O-10-13476 | Formentera Operations LLC | Wheeler (Wolfcamp) | Ector | 2 | 200K | 391K | by Jan 1993 – Aug 2026 |
| Stiles 16 G-14-269031 | Formentera Operations LLC | Stiles Ranch (Granite Wash Cons) | Wheeler | 1 | 200K | 3.76M | Jan 2013 – Aug 2026 |
| University Lands 25-B O-10-46178 | Formentera Operations LLC | McElroy | Crane | 1 | 197K | 226K | Dec 2014 – Aug 2026 |
| Tubb, J. B. -F- O-10-10413 | Formentera Operations LLC | Sand Hills (Tubb) | Crane | 21 | 196K | 2.24M | by Jan 1993 – Aug 2026 |
| Bartz 19A O-14-9037 | Formentera Operations LLC | Mills Ranch (Granite Wash Cons.) | Wheeler | 1 | 195K | 1.18M | Aug 2013 – Aug 2026 |
| Waddell Ranch O-10-45806 | Formentera Operations LLC | Waddell (Wichita-Albany) | Winkler | 2 | 195K | 129K | May 2014 – Aug 2026 |
| Tubb, J. B. -C- O-10-18870 | Formentera Operations LLC | Sand Hills (McKnight) | Crane | 22 | 192K | 1.66M | by Jan 1993 – Aug 2026 |
| Stonegate 152 O-10-55000 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 191K | 203K | Feb 2020 – Aug 2026 |
| Cummins, H.e."k" O-10-24278 | Formentera Operations LLC | Goldsmith, N. (San Andres, Con.) | Ector | 3 | 189K | 482K | by Jan 1993 – Dec 2022 |
| Stiles 68 O-14-9453 | Formentera Operations LLC | Mills Ranch (Granite Wash Cons.) | Wheeler | 4 | 188K | 1.4M | Dec 2015 – Aug 2026 |