| Fee "BK" O-10-43440 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 74 | 4.98M | 14.8M | Dec 2012 – Jul 2026 |
| Fee 'BL' O-10-44349 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 62 | 4.24M | 18.7M | Oct 2013 – Jul 2026 |
| Lupin TXL Fee O-10-40383 | Diamondback E&P LLC only | Spraberry (Trend Area) | Midland | 95 | 3.45M | 16.4M | Jul 2010 – Jul 2026 |
| Fee 'BQ' O-10-47041 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Andrews | 45 | 2.95M | 13.4M | Oct 2015 – Jul 2026 |
| Fee 'BJ' O-10-47876 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 48 | 2.59M | 11.7M | Jul 2016 – Jul 2026 |
| Four Corners TXL Fee "C" O-10-44507 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Upton | 48 | 2.33M | 8.95M | Aug 2013 – Jul 2026 |
| Fee "BI" O-10-42295 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.7M | 7M | Jan 2012 – Jul 2026 |
| Fee 'BC' O-10-44386 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.64M | 5.48M | Sep 2013 – Jul 2026 |
| Lupin TXL Fee 'B' O-10-42510 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 36 | 1.46M | 4.98M | Sep 2012 – Jul 2026 |
| Fee "BB" O-10-42344 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.41M | 4.71M | Feb 2012 – Jul 2026 |
| Fee "BD" O-10-42591 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 19 | 1.12M | 4.39M | Feb 2012 – Jul 2026 |
| Lupin TXL Fee "A" O-10-42600 | Diamondback E&P LLC only | Spraberry (Trend Area) | Ector | 28 | 872K | 3.15M | Aug 2011 – Jul 2026 |
| Lupin TXL Fee 'C' O-10-44309 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 16 | 547K | 2.03M | Dec 2012 – Jul 2026 |
| Texaco Fee O-10-33600 | Maralo, LLC only | W. T. Ford (Ellenburger) | Ector | 5 | 379K | 356K | Jan 1993 – Mar 2002 |
| Ector 'BH' Fee O-10-35146 | Texland Petroleum, L.P. only | Cowden, North (Clear Fork) | Ector | 3 | 341K | 25 | Nov 1996 – Jul 2026 |
| Four Corners TXL Fee 'B' O-10-45228 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 12 | 243K | 496K | Jun 2014 – Jul 2026 |
| Fee "AH" O-10-36973 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 3 | 223K | 13.3K | Nov 2002 – Jul 2026 |
| Texaco Fee O-10-41333 | V-F Petroleum Inc. only | VHZ (Devonian) | Ector | 4 | 207K | 522K | Jun 2011 – Jul 2026 |
| Ector Fee Unit O-10-34363 | Aghorn Operating, Inc. only | Harper (Fusselman) | Ector | 1 | 165K | 242K | Dec 1994 – Jul 2026 |
| Lupin TXL Fee 'D' O-10-44023 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 3 | 120K | 232K | May 2013 – Jul 2026 |
| Ector -AR- Fee O-10-18196 | Pen-Tex Production Co. Inc. only | Harper | Ector | 18 | 115K | 81.9K | Jan 1993 – Jul 2026 |
| Fee "AU" O-10-38914 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 2 | 105K | 222K | Aug 2008 – Jul 2026 |
| Ector -E- Fee NCT-2 O-10-17723 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 2 | 100K | 107K | Jan 1993 – Jul 2026 |
| Ector -AM- Fee O-10-35104 | Aghorn Operating, Inc. only | Harper | Ector | 2 | 86K | 98.6K | Oct 1996 – Jul 2026 |
| Fee "ZF" O-10-29636 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 1 | 83.8K | 38.9K | Jan 1993 – Jul 2026 |
| Ector Fee Unit O-10-36622 | Aghorn Operating, Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 77.5K | 52K | Dec 2000 – Jul 2026 |
| Ector 'BF' Fee O-10-34397 | Diamond S Energy Company only | York (Grayburg) | Ector | 4 | 65K | 326K | Jan 1995 – Jul 2026 |
| Texaco Fee "A" O-10-33787 | Maralo, Inc. only | W. T. Ford (Ellenburger) | Ector | 2 | 63.9K | 49.2K | Apr 1993 – Jan 1994 |
| Ector -AB- Fee O-10-14000 | Aghorn Operating, Inc. only | G & W (Devonian) | Ector | 2 | 39.1K | 172K | Jan 1993 – Jul 2026 |
| Fee -ZG- O-10-28802 | Fasken Oil and Ranch, Ltd. only | Fasken (Penn.) | Ector | 10 | 36.5K | 1.26M | Jan 1993 – Jul 2026 |
| Fee 'BL' O-10-49317 | Fasken Oil and Ranch, Ltd. only | Lowe, West (Strawn) | Ector | 1 | 29.3K | 133K | Oct 2017 – Aug 2022 |
| Fee "ZG" O-10-36944 | Fasken Oil and Ranch, Ltd. only | Fasken (Wolfcamp) | Ector | 1 | 26.1K | 96.9K | Sep 2002 – Jul 2026 |
| Ector 'T' Fee "47" O-10-36348 | Chevron U. S. A. Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 25.8K | 21.4K | Jan 2000 – Nov 2004 |
| Ector "C" Fee NCT-1 O-10-28552 | Formentera Operations LLC only | Mosswell (Strawn 8720) | Ector | 1 | 24.9K | 544 | Jan 1993 – Jul 2026 |
| Aghorn AB Fee O-10-50520 | Aghorn Operating, Inc. only | Arbol de Nada (Devonian) | Ector | 2 | 12.5K | 29.1K | Sep 2018 – Jul 2026 |
| Ector -BA- Fee O-10-26063 | Highmark Energy Operating, LLC only | Cowden, North | Ector | 1 | 11.7K | 48.3K | Jan 1993 – Jul 2026 |
| Ector Fee Unit O-10-36827 | Aghorn Operating, Inc. only | Harper (Strawn) | Ector | 1 | 11.2K | 10.1K | Mar 2002 – Jul 2026 |
| Ector Fee Unit O-10-19819 | Gilliam's Aghorn Energy only | Harper, SE. (Ellen.) | Ector | 2 | 8.38K | 20K | Jan 1993 – Aug 1995 |
| Ector -AP- Fee O-10-17974 | Garner's Well Service LLC only | Harper | Ector | 6 | 7.59K | 55 | Jan 1993 – Jul 2026 |
| Ector "AK" Fee O-10-32120 | OXY USA Inc. only | Cowden, South | Ector | 2 | 2.85K | 9 | Jan 1993 – Feb 2012 |
| Fee -ZG- O-10-30163 | Fasken, Barbara only | Fasken, SW. (Wolfcamp, Lower) | Ector | 1 | 1.16K | 251 | Jan 1993 – Feb 1994 |
| Fee 'BK' O-10-51720 | Fasken Oil and Ranch, Ltd. only | Emma (Mississippian) | Ector | 1 | 1.07K | 6.19K | Feb 2019 – Mar 2020 |
| Ector -BE- Fee O-10-32840 | Aghorn Operating, Inc. only | Cowden, South (Canyon 8900) | Ector | 1 | 0 | 0 | Jan 1993 – Jul 2026 |
| Lupin TXL Fee "B" SWD O-10-58874 | Rattler Midstream Operating LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 1 | 0 | 0 | Dec 2022 – Jul 2026 |
| Ector AB Fee O-10-33045 | Aghorn Operating, Inc. only | Goldsmith, W. (San Andres) | Ector | 1 | 0 | 0 | Jan 1993 – Jul 2026 |
| Texaco Fee 3A O-10-33928 | Maralo, Inc. only | W. T. Ford (Ellenburger) | Ector | 1 | 0 | 0 | Sep 1993 – Oct 1993 |
| Ector -AS- Fee O-10-32044 | Conoco Inc. only | Cowden, South (Canyon 8900) | Ector | 2 | 0 | 0 | Jan 1993 – Jun 1993 |
| Ector Fee Unit O-10-36826 | Energen Resources Corporation only | Harper (Strawn) | Ector | 1 | 0 | 0 | Mar 2002 – Apr 2002 |
| Fee "ZG" O-10-37258 | Fasken Oil and Ranch, Ltd. only | Fasken (Wolfcamp, Lower) | Ector | 1 | 0 | 0 | Apr 2002 – Jul 2026 |
| Ector "BB" Fee G-10-116798 | OXY USA Inc. only | Cowden, North | Ector | 1 | 0 | 741K | Jan 1993 – May 2011 |