| Rio Grande Land Trust G.U. #1 G-4-129705 | Texas Independent Explor., Inc. only | Mercedes ( 3-D) | Hidalgo | 1 | 20 | 23.2K | by Jan 1993 – Apr 1998 |
| Hill-Randee Fawcett Trust "K" G-9-209588 | Upp Operating, LLC only | Sawyer (Canyon) | Sutton | 1 | 20 | 173K | Jun 2004 – Jul 2026 |
| JBG Childrens 1991 Trust "E" G-3-197287 | Lone Wolf Operating Company only | Brookshire | Waller | 1 | 20 | 122K | Jul 2003 – Oct 2004 |
| Weinheimer,e.a.-Grady Trust Unit G-3-148158 | Conoco Inc. only | El Campo, North (Miocene) | Wharton | 1 | 20 | 122K | Jan 1994 – Sep 1994 |
| Hankamer G-3-138232 | U.S. Exploration Liq. Trust only | Camptown (5200 Frio) | Newton | 1 | 20 | 72 | by Jan 1993 – Mar 1993 |
| West Ranch G-10-260145 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 20 | 1.01M | Sep 2010 – Jan 2024 |
| West Ranch G-10-249408 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 19 | 79.6K | Nov 2008 – May 2026 |
| Fawcett, Randee Trust "C" G-9-213853 | Upp Operating, LLC only | Sawyer (Canyon) | Sutton | 1 | 19 | 148K | Jul 2005 – Jul 2026 |
| West Ranch G-10-244928 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 19 | 233K | Jan 2008 – Feb 2025 |
| West Ranch G-10-252817 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 19 | 139K | Nov 2008 – Feb 2024 |
| Parker Trust -20- O-10-32431 | Mission Resources Corporation only | Harper (Devonian) | Ector | 1 | 19 | 1 | Aug 1994 – Dec 1994 |
| West Ranch G-10-258017 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 19 | 896K | Jul 2010 – Feb 2024 |
| West Ranch G-10-251519 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 19 | 101K | Jun 2009 – Apr 2024 |
| Cole Trusts 576 "A" G-13-194118 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Denton | 1 | 19 | 1.5M | Jan 2003 – Apr 2021 |
| Marrs McLean Trust G-4-177420 | Columbus Energy, LLC only | Thompsonville, NE. (12500 FB-C) | Jim Hogg | 1 | 19 | 2.32M | May 2000 – May 2014 |
| Longfellow State G-10-240066 | Occidental W TX Overthrust, Inc. only | Pinon (Overthrust) | Pecos | 1 | 19 | 232K | May 2008 – Jul 2010 |
| Benavides Trust G-4-192464 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 19 | 749K | Dec 2002 – Aug 2026 |
| West State G-10-260537 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 1.5M | Aug 2009 – Jan 2025 |
| West Ranch South 4 G-10-259629 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 1.09M | Nov 2009 – Feb 2024 |
| Randee Fawcett Trust G-9-212326 | Upp Operating, LLC only | Sawyer (Canyon) | Sutton | 1 | 18 | 150K | May 2005 – Jul 2026 |
| West Ranch G-10-252865 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 33.1K | Sep 2008 – Jul 2026 |
| Marshall,stanley G. Trustee -A- G-4-108804 | Hughes, Dan A. Company only | Tom Shearman (11200) | Webb | 1 | 18 | 503K | by Jan 1993 – Mar 1994 |
| West Ranch G-10-218477 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 409K | Jun 2006 – Jun 2015 |
| West Ranch G-10-271550 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 603K | Feb 2010 – Apr 2024 |
| Longfellow G-10-273570 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 18 | 130K | Jan 2011 – Aug 2026 |
| The Dinn Mineral Trusts G-4-186628 | Hilcorp Energy Company only | Guerra (10900) | Webb | 1 | 18 | 1.36M | Oct 2001 – Aug 2026 |
| El Peyote Mineral Trust G-4-145748 | TD Natural Resources LLC only | Loma Vieja (Wilcox) | Zapata | 1 | 17 | 4.72M | May 1993 – Jul 2002 |
| Cartwright Trust G-2-172731 | C & E Operating, Inc. only | Berclair, E. (Frio Middle) | Goliad | 1 | 17 | 236K | Feb 1999 – Feb 2002 |
| Longfellow G-10-249922 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 17 | 271K | Jun 2008 – Aug 2026 |
| West Ranch G-10-217783 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 17 | 14.7K | Apr 2006 – Sep 2007 |
| Fawcett, Randee Trust C G-9-215977 | Upp Operating, LLC only | Sawyer (Canyon) | Sutton | 1 | 16 | 183K | Oct 2005 – Jul 2026 |
| Randee Fawcett Trust G-9-215918 | Upp Operating, LLC only | Sawyer (Canyon) | Sutton | 1 | 16 | 226K | Sep 2005 – Jul 2026 |
| The Dinn Mineral Trusts G-4-175497 | Hilcorp Energy Company only | Guerra (10600) | Webb | 1 | 16 | 1.96M | Dec 1999 – May 2016 |
| Haynes Mineral Trust G-4-146891 | Hilcorp Energy Company only | Munoz (Lobo) | Zapata | 1 | 16 | 670K | Sep 1993 – Aug 2026 |
| Cole Trust Three G-13-184865 | Devon Energy Production Co, L.P. only | Newark, East (Barnett Shale) | Denton | 1 | 16 | 294K | Aug 2001 – Apr 2009 |
| Richardson Trust O-13-27541 | Denton Exploration, Inc. only | Archer County Regular | Archer | 1 | 15 | 15 | by Jan 1993 – Mar 1994 |
| Cole Trusts 576 "A" G-13-184863 | BKV Barnett, LLC only | Newark, East (Barnett Shale) | Denton | 1 | 15 | 403K | Aug 2001 – Jun 2026 |
| Allison Ranch G-10-248775 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 15 | 1.24M | Feb 2009 – Apr 2024 |
| Trust "H. T. & B." Unit G-8-175389 | Van Operating, Ltd. only | Antelope Hills (Caddo, Upper) | Shackelford | 1 | 15 | 71.4K | Sep 1999 – Jan 2001 |
| Longfellow G-10-246151 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 15 | 177K | Oct 2008 – Apr 2026 |
| Citizens Natl. Bank Trustee -G- G-14-119368 | United Oil & Shale LLC only | Coburn (Morrow, Lo.) | Lipscomb | 1 | 15 | 2.35K | by Jan 1993 – Dec 1993 |
| Hill-Fawcett, Randee Trust "D" G-9-215264 | Upp Operating, LLC only | Sawyer (Strawn, North) | Sutton | 1 | 15 | 14.8K | Oct 2005 – Nov 2005 |
| Young Trust G-14-108206 | Mmgl Txph, LLC only | Allison Parks (Morrow, Up.) | Hemphill | 1 | 15 | 4.75M | by Jan 1993 – Aug 2026 |
| Cole, M. T. Trust G-13-60258 | 4M Oil & Gas, LLC only | Gas Finders (Congl.) | Denton | 1 | 15 | 386K | by Jan 1993 – Aug 2026 |
| Benavides Trust G-4-200536 | Merit Energy Company only | Hundido (Lobo) | Zapata | 1 | 15 | 345K | Mar 2004 – Feb 2016 |
| Douglas Mineral Trust G O-13-32363 | R2Q Operating LLC only | Ancell (Ellenburger) | Wichita | 1 | 15 | 0 | Mar 2026 – Aug 2026 |
| Haynes Mineral Trust G-4-209789 | Hilcorp Energy Company only | Munoz (Lobo) | Zapata | 1 | 15 | 602K | Feb 2005 – Aug 2026 |
| Allison G-10-239159 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 14 | 1.7M | Apr 2008 – Apr 2024 |
| Allison G-10-248454 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 14 | 1.28M | Feb 2009 – Apr 2024 |
| West Ranch G-10-249678 | Longfellow Energy, LP only | Pinon (Overthrust) | Pecos | 1 | 14 | 277K | Dec 2008 – Feb 2024 |