| Fee "BK" O-10-43440 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 74 | 5.01M | 15M | Dec 2012 – Aug 2026 |
| Fee 'BL' O-10-44349 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 62 | 4.29M | 19M | Oct 2013 – Aug 2026 |
| Lupin TXL Fee O-10-40383 | Diamondback E&P LLC only | Spraberry (Trend Area) | Midland | 95 | 3.46M | 16.4M | Jul 2010 – Aug 2026 |
| Fee 'BQ' O-10-47041 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Andrews | 45 | 2.99M | 13.4M | Oct 2015 – Aug 2026 |
| Fee 'BJ' O-10-47876 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 48 | 2.61M | 11.8M | Jul 2016 – Aug 2026 |
| Four Corners TXL Fee "C" O-10-44507 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Upton | 48 | 2.33M | 8.98M | Oct 2013 – Aug 2026 |
| Fee "BI" O-10-42295 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.7M | 7.06M | Feb 2012 – Aug 2026 |
| Fee 'BC' O-10-44386 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.64M | 5.53M | Sep 2013 – Aug 2026 |
| Lupin TXL Fee 'B' O-10-42510 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 36 | 1.47M | 5.01M | Oct 2012 – Aug 2026 |
| Fee "BB" O-10-42344 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 24 | 1.42M | 4.75M | Feb 2012 – Aug 2026 |
| Fee "BD" O-10-42591 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 19 | 1.13M | 4.43M | Apr 2012 – Aug 2026 |
| Lupin TXL Fee "A" O-10-42600 | Diamondback E&P LLC only | Spraberry (Trend Area) | Ector | 28 | 873K | 3.15M | Feb 2012 – Aug 2026 |
| Ector Fee Unit II O-10-21673 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 3 | 728K | 736K | by Jan 1993 – Aug 2026 |
| Lupin TXL Fee 'C' O-10-44309 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 16 | 548K | 2.03M | Jan 2013 – Aug 2026 |
| Texaco Fee O-10-33600 | Maralo, LLC only | W. T. Ford (Ellenburger) | Ector | 5 | 379K | 356K | by Jan 1993 – Mar 1999 |
| Ector 'BH' Fee O-10-35146 | Texland Petroleum, L.P. only | Cowden, North (Clear Fork) | Ector | 3 | 342K | 25 | Nov 1996 – Aug 2026 |
| Ector -AZ- Fee O-10-21871 | Aghorn Operating, Inc. only | Edwards, West (Canyon) | Ector | 2 | 254K | 877K | by Jan 1993 – Jun 2026 |
| Four Corners TXL Fee 'B' O-10-45228 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 12 | 243K | 497K | Jul 2014 – Aug 2026 |
| Fee "AH" O-10-36973 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 3 | 224K | 14K | Nov 2002 – Aug 2026 |
| Texaco Fee O-10-41333 | V-F Petroleum Inc. only | VHZ (Devonian) | Ector | 4 | 212K | 522K | Jul 2011 – Aug 2026 |
| Ector Fee Unit O-10-34363 | Aghorn Operating, Inc. only | Harper (Fusselman) | Ector | 1 | 166K | 242K | Dec 1994 – Jun 2026 |
| Lupin TXL Fee 'D' O-10-44023 | Diamondback E&P LLC only | Sallie Ann (Spraberry-Wolfcamp) | Ector | 3 | 120K | 232K | Feb 2014 – Aug 2026 |
| Ector -AR- Fee O-10-18196 | Pen-Tex Production Co. Inc. only | Harper | Ector | 18 | 115K | 82.2K | by Jan 1993 – Aug 2026 |
| Fee "AU" O-10-38914 | Fasken Oil and Ranch, Ltd. only | Spraberry (Trend Area) | Ector | 2 | 106K | 224K | Aug 2008 – Aug 2026 |
| Ector -E- Fee /NCT-2/ O-10-16998 | Formentera Operations LLC only | Harper | Ector | 6 | 104K | 62.4K | by Jan 1993 – Aug 2026 |
| Ector -E- Fee NCT-2 O-10-17723 | Formentera Operations LLC only | Harper (Ellenburger) | Ector | 2 | 100K | 107K | Dec 1996 – Sep 2015 |
| Ector -AM- Fee O-10-35104 | Aghorn Operating, Inc. only | Harper | Ector | 2 | 86.3K | 98.9K | Apr 2000 – Jun 2026 |
| Fee "ZF" O-10-29636 | Fasken Oil and Ranch, Ltd. only | Cowden, North | Ector | 1 | 83.8K | 38.9K | by Jan 1993 – Aug 2026 |
| Ector Fee Unit O-10-36622 | Aghorn Operating, Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 77.5K | 52K | Dec 2000 – Mar 2026 |
| Ector -AM- Fee O-10-18059 | Aghorn Operating, Inc. only | Harper (Ellenburger) | Ector | 1 | 77.5K | 70.2K | by Jan 1993 – Jun 2026 |
| Ector 'BF' Fee O-10-34397 | Diamond S Energy Company only | York (Grayburg) | Ector | 4 | 65.1K | 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 – Oct 1993 |
| Ector -a- Fee O-10-8643 | Helms Oil & Gas, LLC only | Double -H- (Grayburg) | Ector | 7 | 63.4K | 18.9K | by Jan 1993 – Aug 2021 |
| Ector -T- Fee O-10-11684 | Pen-Tex Production Co. Inc. only | Harper | Ector | 10 | 57.1K | 38.3K | by Jan 1993 – Aug 2026 |
| Ector -H- Fee O-10-9761 | Formentera Operations LLC only | Harper | Ector | 13 | 52.5K | 29.8K | by Jan 1993 – Aug 2026 |
| Ector -Q- Fee O-10-10984 | Aghorn Operating, Inc. only | TXL (San Andres) | Ector | 4 | 48.9K | 149K | by Jan 1993 – Feb 2018 |
| Ector -AB- Fee O-10-14000 | Aghorn Operating, Inc. only | G & W (Devonian) | Ector | 2 | 39.3K | 173K | by Jan 1993 – Jun 2026 |
| Ector -AG- Fee O-10-17490 | Diamondback E&P LLC only | Moose (Wolfcamp) | Ector | 1 | 38.2K | 122K | by Jan 1993 – Jun 2015 |
| Fee -ZG- O-10-28802 | Fasken Oil and Ranch, Ltd. only | Fasken (Penn.) | Ector | 10 | 36.5K | 1.26M | by Jan 1993 – Jan 2020 |
| Ector -G- Fee O-10-9554 | Pen-Tex Production Co. Inc. only | Harper | Ector | 6 | 35K | 80 | by Jan 1993 – Aug 2026 |
| Ector -K- Fee O-10-17839 | Formentera Operations LLC only | Harper (Strawn) | Ector | 1 | 33.5K | 40.7K | by Jan 1993 – Aug 2026 |
| Ector -F- Fee O-10-9424 | Nicki T Oil & Gas LLC only | Harper | Ector | 2 | 32.9K | 48 | by Jan 1993 – Mar 2026 |
| Fee 'BL' O-10-49317 | Fasken Oil and Ranch, Ltd. only | Lowe, West (Strawn) | Ector | 1 | 29.3K | 133K | Nov 2017 – Mar 2022 |
| Fee "ZG" O-10-36944 | Fasken Oil and Ranch, Ltd. only | Fasken (Wolfcamp) | Ector | 1 | 26.1K | 96.9K | Sep 2002 – Jan 2021 |
| Ector 'T' Fee "47" O-10-36348 | Chevron U. S. A. Inc. only | Harper, SE. (Ellen.) | Ector | 1 | 25.8K | 21.4K | Jan 2000 – Dec 2003 |
| Ector "C" Fee NCT-1 O-10-28552 | Formentera Operations LLC only | Mosswell (Strawn 8720) | Ector | 1 | 24.9K | 544 | by Jan 1993 – May 2024 |
| Ector -AY- Fee O-10-22077 | Chevron U. S. A. Inc. only | Edwards, West (Canyon) | Ector | 1 | 15.8K | 85.6K | by Jan 1993 – Oct 1998 |
| Ector -AI- Fee O-10-18615 | Aghorn Operating, Inc. only | Goldsmith, N. (San Andres, Con.) | Ector | 2 | 14.7K | 3.35K | by Jan 1993 – Dec 2022 |
| Ector -AN- Fee O-10-17784 | Nicki T Oil & Gas LLC only | Harper | Ector | 1 | 13.6K | 47 | by Jan 1993 – Mar 2026 |
| Ector -E- Fee /NCT-1/ O-10-16997 | Formentera Operations LLC only | Harper | Ector | 2 | 13.3K | 19.9K | Apr 2002 – Aug 2026 |