| University Waddell Devonian Unit O-10-20692 | Formentera Operations LLC | University Waddell (Devonian) | Crane | 41 | 2.19M | 3.9M | by Jan 1993 – Aug 2026 |
| Ector Fee Unit II O-10-21673 | Formentera Operations LLC | Harper (Ellenburger) | Ector | 3 | 728K | 736K | by Jan 1993 – Aug 2026 |
| Waddell O-10-23120 | Formentera Operations LLC | Keystone (San Andres) | Winkler | 30 | 502K | 1.14M | by Jan 1993 – Aug 2026 |
| Waddell Bros & Co O-10-33426 | Formentera Operations LLC | A. W. (Devonian) | Winkler | 5 | 480K | 751K | by Jan 1993 – Nov 2015 |
| Waddell Bros. & Co. O-10-10687 | Formentera Operations LLC | Circle 2 (Fusselman) | Winkler | 3 | 378K | 437K | by Jan 1993 – May 2025 |
| Southern Unit O-10-22613 | Formentera Operations LLC | Running W (Waddell) | Crane | 55 | 357K | 153K | by Jan 1993 – Aug 2026 |
| Campbell O-10-48651 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 2 | 340K | 1.5M | Sep 2016 – Aug 2026 |
| State Walton -E- O-10-3264 | Formentera Operations LLC | Kermit (Ellenburger) | Winkler | 3 | 333K | 6.88M | by Jan 1993 – Aug 2026 |
| Waddell O-10-37632 | Formentera Operations LLC | Keystone, South (Devonian) | Winkler | 5 | 248K | 811K | Dec 2005 – Sep 2025 |
| Waddell Dunes 8 O-10-53974 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 243K | 162K | Aug 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 |
| TXL "K" Tract II O-10-24229 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 1 | 201K | 490K | by Jan 1993 – Aug 2026 |
| Waddell Ranch O-10-45806 | Formentera Operations LLC | Waddell (Wichita-Albany) | Winkler | 2 | 195K | 129K | May 2014 – Aug 2026 |
| Campbell Glo 21 O-10-50803 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 169K | 607K | Jun 2018 – Aug 2026 |
| Laney O-11-62773 | Formentera Operations LLC | Levelland | Cochran | 4 | 157K | 6.67K | by Jan 1993 – Aug 2026 |
| White, E. C. O-11-66487 | Formentera Operations LLC | Levelland | Hockley | 6 | 150K | 22.5K | by Jan 1993 – Aug 2026 |
| Slator -B- O-10-6972 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 2 | 130K | 432K | by Jan 1993 – Aug 2026 |
| Petsch O-10-6961 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 1 | 125K | 319K | by Jan 1993 – Apr 2026 |
| Campbell O-10-45588 | Formentera Operations LLC | Martin (Consolidated) | Winkler | 3 | 115K | 401K | Sep 2014 – Aug 2026 |
| Ector -E- Fee NCT-2 O-10-17723 | Formentera Operations LLC | Harper (Ellenburger) | Ector | 2 | 100K | 107K | Dec 1996 – Sep 2015 |
| State of Texas -DX- O-10-18118 | Formentera Operations LLC | University Waddell (Devonian) | Crane | 6 | 98.4K | 78.8K | by Jan 1993 – Aug 2026 |
| Waddell O-10-31917 | Formentera Operations LLC | Keystone (Colby) | Winkler | 20 | 95.5K | 94.1K | by Jan 1993 – May 2020 |
| Barrow, Augusta O-10-354 | Formentera Operations LLC | Barrow (Ellenburger) | Ector | 4 | 87.9K | 99.2K | Jan 1994 – Aug 2015 |
| Waddell O-10-37719 | Formentera Operations LLC | A. W. (Ellen.) | Winkler | 1 | 80.1K | 115K | Mar 2006 – Aug 2026 |
| Campbell O-10-48182 | Formentera Operations LLC | Keystone, South | Winkler | 1 | 79.5K | 198K | Mar 2014 – Mar 2021 |
| Thomas, H. TR.1 O-10-17016 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 1 | 71.6K | 245K | by Jan 1993 – Jun 2026 |
| Waddell 5 O-10-50913 | Formentera Operations LLC | Keystone (Wolfcamp) | Winkler | 1 | 60.2K | 1.78K | Feb 2018 – Apr 2024 |
| Waddell Bros & Co O-10-34955 | Formentera Operations LLC | Wheeler, West (Wolfcamp) | Winkler | 4 | 46.2K | 138K | Mar 1996 – Apr 2026 |
| Waddell Bros & Co O-10-59968 | Formentera Operations LLC | Wheeler (Wolfcamp) | Winkler | 1 | 39.8K | 18.3K | Mar 2022 – May 2025 |
| Alexander, Joab O-11-63352 | Formentera Operations LLC | Levelland | Cochran | 1 | 39.8K | 140 | by Jan 1993 – Aug 2026 |
| Wheeler, R. A. O-10-31889 | Formentera Operations LLC | Wheeler (Waddell) | Ector | 1 | 37.3K | 101K | by Jan 1993 – Oct 2024 |
| J.B. Tubb "C" O-10-37471 | Formentera Operations LLC | Sand Hills (Ellenburger) | Crane | 1 | 29.3K | 10.9K | Feb 2005 – Sep 2009 |
| Ector "C" Fee NCT-1 O-10-28552 | Formentera Operations LLC | Mosswell (Strawn 8720) | Ector | 1 | 24.9K | 544 | by Jan 1993 – May 2024 |
| White, E. C. O-11-62583 | Formentera Operations LLC | Levelland | Hockley | 2 | 16.8K | 141 | by Jan 1993 – Mar 2023 |
| State of Texas -DV- O-10-16924 | Formentera Operations LLC | University Waddell (Devonian) | Crane | 3 | 14.8K | 9.79K | by Jan 1993 – Sep 2019 |
| Tubb, J. B. I O-10-34813 | Formentera Operations LLC | Sand Hills (Ellenburger) | Crane | 1 | 7.26K | 1.88K | Jan 1996 – Jun 1996 |
| Durelle O-10-36208 | Formentera Operations LLC | Block 27 (Tubb) | Crane | 3 | 6.13K | 29.3K | Nov 1999 – Apr 2020 |
| Smelley G-13-239921 | Formentera Operations LLC | Newark, East (Barnett Shale) | Parker | 1 | 4.08K | 687K | Oct 2007 – Aug 2026 |
| Guiles, Derrell H. G-13-226634 | Formentera Operations LLC | Newark, East (Barnett Shale) | Parker | 1 | 3.31K | 580K | Nov 2006 – Aug 2026 |
| Texas University Sec. 1 & 2 O-10-59708 | Formentera Operations LLC | University Waddell (Penn.) | Crane | 1 | 3.3K | 6.84K | Jul 2023 – Aug 2026 |
| Mitchell, W. G. G-13-228427 | Formentera Operations LLC | Newark, East (Barnett Shale) | Parker | 1 | 2.23K | 867K | Mar 2007 – Aug 2026 |
| Waddell, W.N. O-10-51282 | Formentera Operations LLC | Crawar (San Andres Cons.) | Crane | 1 | 831 | 0 | Feb 2019 – Mar 2020 |
| Tubb, J. B. a/C 1 O-10-37804 | Formentera Operations LLC | Sand Hills (Ellenburger) | Crane | 3 | 687 | 535 | Jul 2011 – Nov 2011 |
| Waddell, W.n.,etal -C- O-10-51281 | Formentera Operations LLC | Crawar (San Andres Cons.) | Crane | 1 | 416 | 0 | Mar 2019 – Mar 2020 |
| Smelley G-13-202293 | Formentera Operations LLC | Newark, East (Barnett Shale) | Parker | 1 | 66 | 36.4K | May 2005 – Jun 2009 |
| Isbell, Alton G-13-253975 | Formentera Operations LLC | Newark, East (Barnett Shale) | Johnson | 1 | 33 | 2.39M | Oct 2009 – Aug 2026 |
| TXL -L- a/C #1 O-10-17919 | Formentera Operations LLC | TXL, North (Waddell) | Ector | 1 | 30 | 0 | May 2007 – Jun 2007 |
| TXL -E- G-10-253059 | Formentera Operations LLC | TXL (Ellenburger) | Ector | 1 | 16 | 34.2K | Sep 2009 – Jul 2012 |
| Durelle G-10-202723 | Formentera Operations LLC | Block 27 (Tubb) | Crane | 1 | 7 | 212K | Dec 2003 – Oct 2018 |
| Parnell G-13-227655 | Formentera Operations LLC | Newark, East (Barnett Shale) | Johnson | 1 | 5 | 1.38M | Jan 2007 – Aug 2026 |