| Harper Devonian Unit G-10-195955 | Hilcorp Energy Company only | Harper (Devonian) | Ector | 1 | 4.61K | 1.51M | May 2003 – Sep 2025 |
| Cowden, R.B. "AB" O-10-33845 | Amoco Production Company only | Goldsmith (5600) | Ector | 1 | 4.59K | 3.27K | May 1993 – Feb 1994 |
| Parker Estate O-10-23999 | Remuda Operating Company only | TXL (Tubb) | Ector | 1 | 4.57K | 63 | Jan 1993 – May 1998 |
| Shell-Cowden O-10-27536 | Bennett, R. C., Company only | Harper | Ector | 7 | 4.54K | 3.56K | Jan 1993 – May 1994 |
| Cowden O-10-35395 | Arco Permian only | Venteam, SE. (Ellenburger) | Ector | 1 | 4.5K | 1.41K | May 1997 – Feb 1998 |
| Cowden, E.F. "F" O-10-32289 | Raptor Petroleum Develop, LLC only | Foster | Ector | 1 | 4.49K | 1.17K | Jan 1993 – Nov 2016 |
| Rant G-10-135210 | Conocophillips Company only | Goldsmith, N. (San Andres, Con.) | Ector | 1 | 4.48K | 199K | Jan 1993 – Nov 2009 |
| Goldsmith Andector Unit G-10-276995 | Maverick Permian LLC only | Goldsmith (Clear Fork) | Ector | 1 | 4.46K | 330K | May 2015 – Apr 2026 |
| Cowden H O-10-8479 | Andector Exploration Company only | Goldsmith (5600) | Ector | 5 | 4.46K | 34.1K | Jan 1993 – Oct 2006 |
| Connell, W.E. A O-10-58297 | Cross Timbers Energy, LLC only | Penwell (Clear Fork) | Ector | 1 | 4.45K | 7.69K | Nov 2022 – Dec 2023 |
| Ector -AO- Fee O-10-17933 | Aghorn Operating, Inc. only | Harper | Ector | 2 | 4.39K | 0 | Oct 1995 – Jan 2026 |
| Lator O-10-30459 | Wind River Energy, Inc. only | TXL (San Andres) | Ector | 1 | 4.37K | 24 | Jan 1993 – Nov 1997 |
| TXL -K- Tract 1 O-10-23991 | Anadarko Petroleum Corporation only | TXL (San Andres) | Ector | 4 | 4.33K | 38.2K | Jan 1993 – Sep 1999 |
| Goldsmith-Landreth (Deep) Unit G-10-156318 | Occidental Permian Ltd. only | Goldsmith (Clear Fork) | Ector | 1 | 4.31K | 754K | Sep 1995 – Sep 2005 |
| Henderson, S. O-10-35653 | Texaco E & P Inc. only | Jordan (Wolfcamp) | Ector | 1 | 4.3K | 956 | Nov 1997 – Jan 2000 |
| Katherine O-10-42764 | Scout Energy Management LLC only | Goldsmith (Clear Fork) | Ector | 1 | 4.25K | 13.2K | Jun 2012 – Oct 2019 |
| Stanolind-Henderson O-10-876 | Baker Operating, Inc. only | Cowden, South | Ector | 2 | 4.24K | 51 | Jan 1993 – Jun 2005 |
| Phillips-TXL -31- O-10-29587 | Rust Oil Corp. only | Mosswell (Strawn 8720) | Ector | 1 | 4.24K | 3.5K | Jan 1993 – Aug 1996 |
| Parker, J. E. O-10-12715 | Richland Resources Corporation only | TXL (Tubb) | Ector | 1 | 4.23K | 10.4K | Jan 1993 – May 1998 |
| Cowden, R. B. O-10-37925 | R3 Operating Corporation only | Goldsmith (Clear Fork) | Ector | 1 | 4.19K | 69.5K | Nov 2006 – Mar 2023 |
| Meteor Crater O-10-50763 | OXY USA WTP LP only | Cowden, South (Dev.) | Ector | 1 | 4.18K | 10.3K | Oct 2018 – Aug 2025 |
| TXL-X O-10-12158 | OXY USA WTP EOR, LLC only | Harper | Ector | 7 | 4.18K | 124 | Jan 1993 – Aug 1995 |
| Cowden -C- O-10-30699 | Johnston, David Mahlon only | Harper | Ector | 1 | 4.15K | 23 | Jan 1993 – May 1998 |
| TXL -F- O-10-18347 | Linn Operating, LLC only | TXL (San Andres) | Ector | 1 | 4.12K | 29.8K | Jan 1993 – Nov 2004 |
| York, R. L. -B- O-10-33939 | Legacy Reserves Operating LP only | York (Queen-Grayburg) | Ector | 1 | 4.12K | 3.75K | Sep 1993 – Oct 1994 |
| Smith O-10-34884 | Ausland Production Company only | Three Leaguers (Clearfork) | Ector | 1 | 4.09K | 0 | Apr 1996 – Dec 1996 |
| Fraser, G. C. -F- O-10-14162 | Sunray Energy, Inc. only | Goldsmith (5600) | Ector | 2 | 4.07K | 17.9K | Jan 1993 – Oct 2006 |
| Ector -AU- Fee G-10-36023 | Formentera Operations LLC only | Goldsmith, East (Grayburg) | Ector | 1 | 4.02K | 786K | Jan 1993 – Jul 2019 |
| Connell, A.B. 29 O-10-33952 | Texaco E & P Inc. only | Jordan (Wichita Albany) | Ector | 1 | 4K | 1.81K | Sep 1993 – Oct 1993 |
| H. E. Cummins "A" O-10-13345 | Aghorn Operating, Inc. only | Goldsmith (Clear Fork) | Ector | 2 | 3.99K | 151K | Jan 1993 – May 1999 |
| TXL -D- O-10-49718 | Formentera Operations LLC only | Goldsmith, W. (San Andres) | Ector | 1 | 3.98K | 2.49K | Mar 2018 – Jan 2026 |
| Henderson, S. O-10-34475 | Chevron U. S. A. Inc. only | Metz, South (Devonian) | Ector | 1 | 3.96K | 2.14K | Apr 1995 – Oct 1997 |
| Parker Minerals 9B O-10-40968 | Crescent Energy Operating, LLC only | Harper | Ector | 2 | 3.94K | 3.39K | Jan 2011 – Aug 2014 |
| TXL Phillips O-10-35578 | OXY USA Inc. only | TXL (Devonian) | Ector | 1 | 3.9K | 16.7K | Nov 1997 – Jun 1999 |
| Addis, Frank V. "E" O-10-868 | Aghorn Operating, Inc. only | Cowden, South | Ector | 12 | 3.9K | 8.91K | Jan 1993 – Mar 1996 |
| Johnson -D- 43- O-10-30503 | Apache Corporation only | Cowden, North (Canyon) | Ector | 1 | 3.82K | 2.79K | Jan 1993 – Feb 1998 |
| Holt, O. B. -C- O-10-56919 | Texland Petroleum, L.P. only | Cowden, North | Ector | 1 | 3.8K | 826 | Jan 2022 – Sep 2025 |
| Slator O-10-49899 | Baker Operating, Inc. only | Goldsmith, W. (San Andres) | Ector | 1 | 3.77K | 800 | Mar 2018 – Apr 2026 |
| Cowden -F- 10-1 O-10-31726 | Andector Exploration Company only | Goldsmith (5600) | Ector | 1 | 3.77K | 8.34K | Jan 1993 – Aug 1996 |
| TXL -B- O-10-242 | Texaco E & P Inc. only | Andector, West (Devonian) | Ector | 2 | 3.72K | 19.7K | Jan 1993 – Feb 1995 |
| Cowden Ranch '9' O-10-48051 | Rust Oil Corp. only | Foster | Ector | 1 | 3.7K | 0 | Aug 2016 – Sep 2023 |
| TXL -L- a/C 3 O-10-23566 | Apache Corporation only | TXL (San Andres) | Ector | 2 | 3.69K | 21.2K | Jan 1993 – Jul 2001 |
| Cowden 24 O-10-33005 | Whiting Oil and Gas Corporation only | Harper (Glorieta) | Ector | 2 | 3.69K | 695 | Jan 1993 – Jul 1994 |
| Parker, J. E. O-10-33813 | Sundown Energy LP only | Goldsmith, N. (San Andres, Con.) | Ector | 1 | 3.66K | 15 | Feb 1994 – Apr 1995 |
| Nobles G-10-153730 | Conocophillips Company only | Andector (McKee) | Ector | 1 | 3.65K | 98.1K | Mar 1995 – Apr 1999 |
| Cowden H O-10-38602 | Andector Exploration Company only | Goldsmith (Clear Fork) | Ector | 1 | 3.6K | 22.1K | Nov 2006 – Aug 2023 |
| Cowden, E. F. -12- O-10-13093 | Pena Bros. Oil and Gas, LLC only | Donnelly (San Andres) | Ector | 5 | 3.59K | 485 | Jan 1993 – Jan 2026 |
| Connell, W. E., Tr. -D- O-10-13973 | Devon Energy Corporation(nevada) only | Metz (Glorietta) | Ector | 1 | 3.55K | 416 | Jan 1993 – Aug 1995 |
| Johnson -B-43- O-10-30273 | Slant Operating, LLC only | Cowden, North (Canyon) | Ector | 1 | 3.47K | 7.51K | Jan 1993 – Jun 1998 |
| CVX 6B O-10-41408 | Sheridan Production Company, LLC only | Monahans Draw (Canyon 8388) | Ector | 1 | 3.45K | 8.63K | Aug 2011 – Jul 2013 |